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Nortel Networks RTU-292 User's Manual

1. 4 2 4 25 44 OPTION INTERFACE BOARD eere nemen retener trennen trennen eret nnne rennen 4 25 4 5 PROMPT OPTION oehini enne nne tenet nennen nnne 4 25 4 5 1 SPEECH PROCEBSSOR 5 a E 4 25 4 5 2 CONTROL PROCESSOR eene eene AE 4 25 4 5 3 VOICE PROMPT SOFTWARE einen nis eene 4 26 46 LOCAL PHONE OPTION etie it 4 26 4 6 1 INTERFACE CIRCUITRY 4 26 4 6 2 DIAL BUSY 8 dee ee 4 26 4 6 3 LOCAL TELEPHONE LINE 4 26 REMOTE CONTROL PROTOCOL 2559950 sacsetdecvencceesseusscncsesevaessevsvevcsansetessonovarscaseceesvesnscess 5 1 54 GENERAL a N iG tte tias CO en Re sede den ee a 5 1 52 5 232 REMOTE CONTROL 5 1 53 COMMANDS SENT TO THE RTU 292 asennan n a nein teen rennen rennen rennen enne nnne 5 1 5 3 1 NULL Command ue oe Ru Re RN dte Rm qtue e 5 3 5 32 Auto Answer Comin nd ba PER Ue fate dp 5 3 5 3 3 Audible Ring Command Ronde ece tree re tlt eaa ere as elitum e ate tees 5 3 5 3 4 Date Command asse Ren donee ent
2. JPS Communications Inc 1 4 m mu RTU 292 Operations Manual 1 3 4 OPTIONS RTU 292 options include the The Voice Prompt Option which gives verbal prompts to the user as an aid in all aspects of unit operation The Local Phone Option which allows a DTMF telephone set to be plugged into the unit allowing control and access from the phone set and the VMM 100 module used to add VMR Voice Modulation Recognition and DSP noise reduction capability Among the Software Options are the Squelch Break Access Option which allows a radio to contact the system via series of squelch breaks and the DTMF Access Option which allows a radio user to contact the system via a DTMF keypad Other Software Options include Call Logging and Remote Control of an URC 200 radio Various spares kits are also available The STU III option allows a STU III phone to be connected to the RTU 292 This allows an encrypted STU III conversation to be decrypted at the RTU 292 The decrypted signal is patched into the connected radio system Table 1 2 Optional Equipment Not Supplied Item Description Depot Spares Kit Spares for 3 to 5 RTU 292s Spare PC Board Kit Spare Boards for 1 unit Spare Parts Kit Spares for one RTU 292 Local Phone Option 5930 596000 Allows remote operation of the RTU 292 through the use of a standard telephone set connected directly to the RTU 292 Local Phone port Telephone set and cable not supplied DTMF Telephone Set 5930 599000
3. The user may review the contents of the speed dial directory by entering the command 22 5 7 When programming is complete enter the sequence to take the RTU 292 out of programming mode 3 7 10 2 Using the Speed Dial Feature Operation is the same as standard except when queried for a phone number by the RTU 292 the radio enters the speed dial location instead of the telephone number For example to call the number stored at speed dial location six the user enters 0 6 star zero six pound All single digit speed dial numbers must be proceeded by a zero as in example provided 3 17 JPS Communications Inc RTU 292 Operations Manual m mu 3 7 11 OPTIONAL 4 WIRE OPERATION The unit can be set to operate with a four wire device instead of a standard 2 wire phone The additional I O is handled by header J6 on the main PCB The STU III option makes use of this capability To put the RTU 292 first place the unit in programming mode with the 99 command Then enter the 6 1 DTMF command To return to 2 wire operation enter 6 0 To query the unit for its current setting enter 6 requires voice prompt option to hear response from unit See Table 3 2 When programming is complete enter to exit the programming mode 3 8 FACTORY RESET It s possible to perform a Factory Reset that will return all user programmable parameters other than the speed dial directory to the initial factory default settings
4. 2 17 JPS Communications Inc RTU 292 Operations Manual Figure 2 1 Outline Dimensions JPS Communications Inc 2 18 RTU 292 Operations Manual FUSE 115V 1ASB 230V 1 2A 58 l 15 4110632 3 5 AUDIBLE RING 90 Tode Handset hanger supplied in Accessory Kit May be installed to front panel as shown or to other location such as side of equipment rack as desired RTU 292 RADIO TELEPHONE INTERFACE Figure 2 2 Control and Connector Locations 2 19 JPS Communications Inc RTU 292 Operations Manual x Ri JINGOW 450 SV VI L SNId SSONOV Q3TIVISNI 38 ISAW 9MId MN3dWnf NI Q3TIVISNI LON SI ASSY 31979 NO88N orr ZNI 100 val is Wann o1L Pavaun 9114 Location Of Internal Option Settings Figure 2 3 2 20 JPS Communications Inc RTU 292 Operations Manual 9 VAN NA X 24 28V 12V Figure 2 4 BALANCED UNBALANCED INPUT JUMPER PINS 1 amp 2 FOR UNBALANCED JUMPER PINS 2 amp 3 FOR BALANCED IMPEDANCE OF UNBALANCED INPUT JUMPER PINS 1 amp 2 FOR LOW Z 600 OHMS JUMPER PINS 2 amp 3 FOR HI Z 47K OHMS BALANCED UNBALANCED OUTPUT JUMPER PINS 1 amp 2 FOR UNBALANCED JUMPER PINS 2 amp 3 FOR BALANCED ADJUSTMENT FOR 12V SUPPLY RING VOLUME ADJUSTMENT ROTATE CLOCKWISE TO INCREASE VOLUME OF INCOMING
5. NOTE It is important to note that only the distant phone connected to the telephone line is routed through the DSP and therefore it is the only phone that can use the RTU 292 s VOX function The local phone and the unit s handset and keypad do not have VOX capability Operators using the local phone or the handset to communicate via the radio must always disable the VOX function and manually key and unkey the transmitter 3 74 PLACING A CALL IN THE COMMAND MODE When a phone call is initiated by the RTU 292 to a distant phone on the outside line and the called party picks up the phone the unit s DSP will immediately execute the adaptation process When it is successful the RTU 292 responds with the READY voice prompt If the DSP could not adapt the RTU 292 gives the VOX UNAVAILABLE prompt informing the recipient of the call that he must manually key and unkey the transmitter All other operation procedures are the same as when a call is initiated by the distant telephone to the RTU 292 3 7 5 TERMINATING A CALL There are several different ways to terminate a call 1 If the PSTN that the RTU 292 is connected to has Reverse Battery Signaling sometimes called line reversal the call will be terminated whenever the telephone caller hangs up the phone Reverse Battery Signaling is used by most domestic US phone systems but is not widely used outside of the US Reverse Battery Signaling momentarily inverts the tip
6. Valid digits for the number string are 0 9 the characters and The comma character is used to produce a 2 second pause No spaces are allowed in the number string Expected Response DTMF Response Examples DTMF 1234 CR Command requesting the RTU 292 to generate DTMF for the digits 1 2 3 and 4 DTMF 1234 CR Status returned indicating that DTMF for the number s 1234 was generated DTMF 1234 CR Command requesting the RTU 292 to generate DTMF for the digits 1 2 3 and 4 DTMF 1234 E6 CR Status returned indicating that this command can not be used at this time In this case the RTU 292 is probably still on hook 5 5 JPS Communications Inc RTU 292 Operations Manual m mu 5 3 8 Handset Phone Command HS PH ONJOFF CR This command is to enable disable or query the current status of Handset Phone Expected Response Handset Phone Response Examples HS PH ON CR Command to enable the Handset Phone path HS_PH ON CR Status returned showing that the Handset Phone path is enabled HS PH CR Command requesting the status of the Handset Phone path 9eHS PH OFF CR Status returned showing that Handset Phone is disabled 5 3 9 Handset Radio Command HS RAD ONJOFF CR This command is to enable disable or query the current status of Handset Radio Expected Response Handset Radio Response Examples HS RAD ON CR Command to enable t
7. Enters the COMMAND 3 12 Factory Default Settings FACTORY RESET Fault Analysis eee FCC PART 68 REGULATIONS FRONT PANEL BUTTONS AND INDICATORS 4 19 FRONT PANEL CONTROLS INDICATORS AND CONNECTORS cits FRONT PANEL SWITCH ASSEMBLIES FSK Modem de 600 0 Full Duplex FULL HALF DUPLEX RADIO eee General Information sese 1 1 GENERAL PRECAUTIONS AND NOTES 6 1 8 dicet teet prc c der 9 Half Duplex 2 aeii iE 9 HANDSET rr dert eb pea ceto 3 1 HANDSET BUTTONS essere 3 2 HANDSET CONNECTOR HANDSET JAGK tert titer ihe e rH eR 3 1 Handset Phone Command sss 5 6 Handset Phone Response see 5 14 Handset Radio Command sess 5 6 Handset Radio 5 14 Handset Switch Assembly sess 6 7 HANDSET WITH THE RADIO 3 6 HANDSET SPEAKER INTERFACE 4 22 Handset Speaker Interface 1 3 ard eh NIE REUS 9 Headphone Circuits essere 4 22 HEADPHONE
8. 4 necu veter rov va JPS Communications Inc 5 2 m mu RTU 292 Operations Manual 5 3 1 NULL Command CR This command may be used as a quick way to insure that RS 232 communication with the RTU 292 is functioning The command has no parameters Expected Response NULL Response Example CR Command sent to the RTU 292 EO CR Status returned from the RTU 292 5 3 2 Auto Answer Command AUTO ANS ONJOFF CR This command is to enable disable or query the current status of Auto Answer Expected Response Auto Answer Response Examples AUTO ANS ON CR Command to enable Auto Answer AUTO_ANS ON CR Status returned showing that Auto Answer is on AUTO ANS CR Command requesting the status of Auto Answer AUTO_ANS OFF CR Status returned showing that Auto Answer is not enabled 5 33 Audible Ring Command AUD_RING lt ON OFF gt lt CR gt This command is to enable disable or query the current status of Audible Ring Expected Response Audible Ring Response Examples AUD RING ON CR Command to enable the audible ring AUD_RING ON 0 lt gt Status returned showing that audible ring is on AUD RING CR Command requesting the status of audible ring AUD_RING OFF CR Status returned showing that audible ring is disabled 5 3 JPS Communications Inc RTU 292 Operations Manual m u 5 3 4 Date Command
9. A means of detecting audio and causing some action when it is present such as keying a transmitter or unmuting an audio path Transmit or Transmitter Voice Modulation Recognition A type of squelch which is activated only by spoken words and not by tones noise or other audio information Voice Operated Xmit Transmit A circuit or algorithm that causes a transmitter to key or some other action when voice or other signal is present This squelch type is activated by any audio signal and is not restricted to voice only 9 JPS Communications Inc RTU 292 Operations Manual This page intentionally left blank JPS Communications Inc 10 m mu RTU 292 Operations Manual 1 General Information 1 1 SCOPE This instruction manual provides the information necessary to install operate repair and maintain the RTU 292 Radio Telephone Interface 1 2 DESCRIPTION 1 2 1 GENERAL The RTU 292 Radio Telephone Interface Unit will provide a trouble free automatic connection between a radio system and telephone or other two wire line The unit is suited for use with HF VHF UHF or satellite systems and is applicable to full or half duplex modes The RTU 292 incorporates a full featured telephone set and monitor speaker Flexible switching allows many operating scenarios The RTU 292 replaces the JPS Communications RTU 282 The RTU 292 contains all of the features and capabilities of the RTU 282 along with some major improvements T
10. DATE ddmmyy CR This command is used to check or set the date on the RTU 292 internal clock If no parameters are given the command simply returns the time date The parameter format is day 01 31 month 01 12 year 00 99 Note the Call Logging Feature must be enabled before use See 3 7 12 Expected Response Time Date Response Examples DATE CR Command requesting the current time and date from the RTU 292 01 MAR 98 11 05 20 E0 CR Status returned indicating that the date is March 15 98 and the time is 11 05 20 seconds in the morning DATE 051297 CR Command to set the date to December 5 97 05 DEC 97 14 18 30 EO CR Status returned indicating that the date is December 5 97 and the time is 2 18 and 30 seconds in the afternoon 5 3 5 Dial Command DIAL lt OPER LP number string CR This command is used to dial a phone number via PSTN line Note the RTU 292 must be on hook to use this command The parameter OPER may be substituted for the number In this case the call will be placed to the front panel of the RTU 292 Likewise the parameter LP may also be substituted for the number This will cause the call to be routed to the Local Phone option if installed Valid digits for the number string 0 9 the characters The comma character is used to produce a 2 second pause while dialing No spaces are allowed in the number string Expected Response Dia
11. HD er IR 3 1 322 HEADPHONE JACK nnne orte en PD ice ADR rp 3 1 3 23 HANDSET JACK an pm Ree ree tush e RAI sare opi trs 3 1 3 2 4 HANDSET ettet tro Rr ett eam tee ere o Min e RS 3 1 32 5 SPEAKER airs step ae reto t ier pe ete e ep resort i ee eds 3 1 3 2 6 KEYPAD sacri itte de tet ede rA RE Nee ER PIRE e rent pim eee e tetas ts 3 2 32 7 SPEAKER VOLUME CONTROL ea nennen en nennen e eeka 3 2 3 2 8 PHONES VOLUME CONTROL eese entente tnter tnt 3 2 3 2 9 TEL TLINEBULTIONS t reo ena PR PAN a e eds 3 2 32 10 HANDSET BUT IONS dr im Nr ER Feo te 3 2 S211 SPEAKER BUTTONS ertet t ge er tta dp i tes oso egre 3 3 321922 TEC VOA qe 3 3 325 JAUTO ANSBUTTON ni rtr t eg Pto trt mer ar I tor a repeti nas 3 3 32 14 AUDIBLE RING BUTTON iere teer hti Ree e AFER ro eid i 3 3 3215 KEY PUSHBUTTON 5 teret ere e RE AR O eleva touts 3 3 3 2516 PEAK CEDi tme ero rene 3 3 33 REARPANEL CONNECTORS irte e ee ER EE RETO OR 3 4 3 3 1 PIRADIOGONNECTOR retinere RHET 3 4 3 32 IEEE EINE HER ER EEUU e ERE PU EUR IEEE RU atas 3 4 3 3 3 FERMINA LBLOCK retten Re TUO 3 4 3 3 4 JZ LOCAT PHONE CONNECTOR vi trt remet 3 4 3 3 5 Pp2 R5 232 RUN RITTER EE 3 4 3 3 6 DC INPUT TERMINAPLE BEQOQCK
12. LOW 13 2 dB below the PSTN setting MIN 10 2 dB below the PSTN setting 6 23 JPS Communications Inc RTU 292 Operations Manual Table 6 1 Fault Analysis No LEDs light after power up At power up the PEAK LED flashes at a steady rate and the unit does not function properly At power up POWER LED is lighted but dim Unit does not function The PEAK LED never flashes on radio receiver audio The PEAK LED is on nearly continuously The TEL LINE RADIO LED flashes for more than three seconds after the TEL LINE PHONE button is pushed The TEL LINE RADIO LED flashes for more than ten seconds after the TEL LINE PHONE button is pushed The VOX does not function VOX false triggers on audio peaks from the receiver JPS Communications Inc Check for correct setting of DC voltage switch S6 Check for proper polarity of DC input If polarity is reversed the unit will not be damaged but will not operate The RTU 292 has failed its self test function Check for proper seating of the internal DSP module Contact JPS Customer Service DC Voltage selector switch S6 set to default 24 28 VDC setting but input voltage is 12V The TEL LINE RADIO button must be ON for the PEAK LED to function or Audio input from the receiver is set too low Adjust RX Input potentiometer R116 fully CW for maximum input If LED still does not flash on audio peaks check receiver audio connections If using unbalanced input
13. This includes the system password the Inactivity Disconnect and Calling Timers etc To perform a Factory Reset hold the 0 zero key in on the front panel keypad while the main power is turned on After the unit has powered up let go of the 0 key 3 9 SPEED DIAL RESET A Speed Dial Reset completely erases the information in the speed dial directory To perform a Speed Dial Reset hold the 1 one key in on the front panel keypad while the main power is turned on After the unit has powered up let go of the 1 key JPS Communications Inc 3 18 m mu RTU 292 Operations Manual 4 RTU 292 Theory Of Operation 4 1 GENERAL This section gives enough detail of the theory of operation of the RTU 292 audio and power supply sections to allow them to be troubleshot in the field The same level of detail is not supplied for the DSP module and the CPU portion as they are considered impractical to field troubleshoot because of the specialized knowledge and test equipment required If a fault is suspected in these sections factory repair is required 4 2 FRONT PANEL BUTTONS AND INDICATORS Figure 8 1 is a schematic of the RTU 292 front panel The control pushbuttons and associated LEDs are arranged in three separate PC board assemblies the Tel Line Switch Assembly the Handset Switch Assembly and the Speaker Switch Assembly Signals from each of these assemblies are combined into one ribbon cable that plugs into the Main Board at J3 Each cont
14. and ring lines to signal that a caller has gone back on hook hung up 2 The sequence will cause the system to disconnect This sequence may be given at ANY time even when the system is prompting for input If Reverse Battery Signaling is not present the termination sequence is always required at the distant phone as the RTU 292 will not be aware that the call has been terminated unless the unit receives Busy or Reorder call progress tones Otherwise the link will not be disconnected until the inactivity timer expires see table 3 1 for information about setting the inactivity timer duration If JPS Communications Inc 3 12 m mu RTU 292 Operations Manual the unit signals that it is dropping the link due to a lack of activity either party may prevent the disconnection by speaking within five seconds 3 Pressing the OFF button on the front panel of the RTU 292 will also cause the system to disconnect 4 When the local phone is used its operator may use the sequence or may simply hang up the phone 3 7 6 DTMF CONTROL COMMANDS Tables 3 1 3 2 and 3 3 explain and list the RTU 292 s various DTMF command modes DTMF commands may be entered via a connected telephone a telephone set when the Local Phone Option is installed or via the front panel keypad Additionally the DTMF keypad on a radio may be used to make connections see DTMF Access Option 3 7 11 Some restrictions apply when sending commands via the fro
15. lt ON OFF gt Exx CR Type Synchronous Response To Auto Answer Command This response indicates the auto answering status Examples AUTO_ANS ON lt gt Status indicating that auto answering is enabled AUTO_ANS OFF CR Status returned indicating that auto answering is disabled 5 4 3 Call Starting Response Radio Telephone Connection Made dd MON yy hh mm ss Exx CR Type Asynchronous Response To Start of a Radio Telephone call This response indicates that a Radio Telephone call has been started The response shows the current time and date The time is shown in 24 hour format Note the Call Logging Feature must be enabled before use See 3 7 12 Examples Status indicating that a radio telephone call has been started on January 10 98 at 6 30 and 25 seconds in the morning Radio Telephone Connection Made 10 JAN 98 06 30 25 E0 CR Status indicating that a radio telephone call has been started on March 25 99 at 2 30 and 25 seconds in the afternoon Radio Telephone Connection Made 25 MAR 99 14 30 25 E0 CR The strings representing the month are JAN FEB MAR APR MAY JUN JLY AUG SEP OCT NOV DEC JPS Communications Inc 5 12 m mu RTU 292 Operations Manual 5 4 4 Dial Response DIAL OPER LP number string Exx CR Type Synchronous Response To Dial Command This response indicates that the given number was dialed Valid digits for the number string
16. or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option To use front panel keypad control the LINE PHONE and LINE RADIO pushbuttons must both be off See 7 7 1 for special instructions regarding the use of the front panel keypad to send DTMF Commands The user must press either the HANDSET PHONE or HANDSET SPEAKER pushbuttons in order to hear the accompanying voice prompts The unit cannot be put into the DTMF Radio Command Mode unless dipswitch SW1 3 is turned on The DTMF Radio Command Mode must then be initiated via the 8 Operational Command before these DTMF Commands can be executed See Table 3 1 When a command has been entered the RTU 292 will acknowledge the command with a tone prompt If an incorrect command is issued the unit plays the ERROR tone and gives the Invalid Entry voice prompt If the command is correct but the data 1s out of range the unit plays the ERROR tone and gives the Data Was Not Accepted By The Radio prompt Whenever a valid command is entered the unit will play back the radio s setting after the command is sent to the radio Note that this feature is only available if the Voice Prompt option is installed Consult the URC 200 manual for further information regarding the command descriptions NOTE It is possible to enable this option remotely If you have purchased an RTU 292 without this option and want to add it contact JPS 7 8 1 CONTROLLING THE RADIO VIA TH
17. should always be set to Off disabled when the Local Phone Option is not installed Table 7 3 Local Phone Enable SWI 7 Local Phone Enabled Table 7 4 Local Phone Ringthrough SWI1 8 Ringthrough Enabled JPS Communications Inc 7 4 m mu RTU 292 Operations Manual 7 3 2 LOCAL PHONE OPTION OPERATION When the handset of the local phone is picked up a special dial tone generated by the RTU 292 will be heard in its receiver The user then has three options Table 7 5 Local Phone DTMF Commands DTMF Command Function Place a call to the RTU 292 Operator Connect radio audio to the local phone Place telephone calls to the outside PSTN line Once the local phone user has selected a function and entered the associated DTMF character he may use any of the keypad commands that are available to a PSTN caller in the command mode see Table 3 1 It is important to note that the local phone audio into the RTU 292 does not run through the unit s DSP circuitry and therefore cannot activate the VOX function Always de activate the VOX function and use the manual key unkey commands when communicating over a radio via the local phone see telephone commands in 3 7 3 4 RCONNEC CABLE Figure 7 2 Local Phone Option Installation 7 5 JPS
18. 18 AC POWER CONNECTOR 3 4 RADIO CONNECTOR eee P2 RS 232 CONNECTOR eee PASSWORD PROTECTION PERFORMANCE TESTING see Phone Line Settings sese PHONES VOLUME CONTROL Places tette e dente eet enge 7 13 PLACING A CALL IN THE COMMAND MODE 3 12 PLACING A TELEPHONE CALL 3 5 Plays Back Phone Number amp Prompts for Confirmation 7 11 Positive Acknowledge 3 9 POWER REQUIREMENTS 2 4 POWER 4 24 Power Supply Section sese 1 3 PREVENTIVE MAINTENANCE 26 1 Programmed ICS 2 1 1 6 7 Programming Commands 3 15 PROGRAMMING MODE SETUP PARAMETERS 2 5 Programming the Speed Dial Directory 3 17 PROMPT TONE GENERATOR Prompts for Confirmation sse Radio Caller Provides Calling Directions 7 11 RADIO CONNECTION 2 12 RADIO CONTROL 22 2 2 9 RADIO CONTROL OPTION 7 15 Radio Interface RADIO 1 6 2 7 RADIO INTERFACE CIRCUITS 4 21 Radio Is Keyed KEYED Ra
19. 2 JI TEL LINE The RJ11C jack provides the telephone line connection to the RTU 292 The telephone line connections are also available at the terminal block 3 33 TERMINAL BLOCK The terminal block is provided mainly as a convenience for the connection of the telephone line to the unit if an RJ 11C plug is not available This block also contains the key relay contacts to the transmitter remote key input signal ground and a spare External Signal Input 3 3 4 J2 LOCAL PHONE CONNECTOR This RJ 11C jack is used to connect a local phone to the unit The Local Phone Option must be installed for this port to be active 3 3 5 P2 RS 232 CONNECTOR This female DB 9 connector provides an interface between the RTU 292 and a radio or a controlling terminal via standard RS 232 signal lines 3 3 6 DC INPUT TERMINAL BLOCK This two position terminal strip has a pair of screw terminals one for a ground wire and another for the DC input of either 12 or 24 28VDC nominal Internal slide switch S6 is used to select between 12 and 424 428 volt input Refer to section 2 7 3 3 7 P1 AC POWER CONNECTOR This is a combination AC power connector fuse holder and line voltage selector It incorporates a line filter to reduce the possibility of RF pickup by the power line from close proximity transmitters Section 2 7 has complete instructions for the line voltage selection and fuse replacement JPS Communications Inc 3 4 m mu RTU 292 Operations Manual
20. 292 is then ready to begin normal operation 2 5 INSTALLATION CONSIDERATIONS Careful attention to the following installation suggestions should result in the best unit system performance Figure 2 1 provides overall unit dimensions The RTU 292 must be installed in a structure that provides both protection from the weather and assurance of ambient temperatures between 20 and 55 degrees C Since the unit is neither splashproof nor corrosion resistant it must be protected from exposure to salt spray When the unit is mounted in a cabinet with other heat generating equipment the use of a rack blower is suggested to keep the cabinet interior temperature rise to a minimum NOTE Before actually installing the unit read Section 2 8 to determine if any internal configuration options must be changed that would necessitate removal of the unit s top cover The RTU 292 Radio Telephone Interface is designed to be mounted in a standard EIA 19 wide rack by means of chassis slides may be ordered from JPS or on an L bracket shelf The unit weighs too much to be installed in a rack supported only by the front panel ears Screws are provided in the accessory kit for securing the unit to the rack via the front panel Included in the Accessory Kit is a handset hanger this hanger may be assembled to the unit s front panel Use the screws located below the logo and unit name The hanger may also be assembled to the side of an equipment rack or elsewhere as
21. 3 4 OPERATION 3 4 4 OPERATION OVERVIEW The RTU 292 is a flexible piece of equipment that contains a telephone and a radio telephone interface circuit with a unique adaptive hybrid These circuits are arranged so that they can be used together or independently in several different ways The unit may be used to manually create the telephone to radio connection or an unmanned connection can be made in the automated mode Here are some examples of RTU 292 operating modes l 2 The telephone may be used to place and receive calls independently of the radio interface The speaker may be used to monitor radio traffic while the handset is used with the internal telephone to place a telephone call The handset may be used to transmit receive from the radio The radio may be connected to the phone line through the adaptive hybrid 5 A phone call may be patched through to a radio link or a radio link patched into a phone line This can be accomplished unattended using a pair of RTU 292s in the Automated Mode The following paragraphs describe the RTU 292 operating modes in detail 3 4 USE OF THE RTU 292 SPEAKER TO MONITOR AUDIO l 3 To monitor radio receive audio push the SPEAKER RADIO button The associated LED will light To monitor telephone audio push the SPEAKER PHONE button The associated LED will light Either the TEL LINE PHONE or the TEL LINE RADIO LED must be ON indicating that the telephone is off hook or there
22. 30VDC 1 A Maximum Size 3 5 19 W x 10 8 9 x 48 3 x 25 4 cm Weight 12 165 5 5 kg ENVIRONMENTAL 20 C to 55 C 40 C to 85 C Up to 95 55 C MIL STD 810D method 516 3 procedure VI MIL STD 810D method 514 3 Category I JPS Communications Inc 1 6 m mu RTU 292 Operations Manual 2 Installation 2 1 GENERAL This section provides the instructions for unpacking inspection installation and set up Also included are directions for reshipment of damaged parts or equipment 2 2 UNPACKING AND INSPECTION After unpacking the unit retain the carton and packing materials until the contents have been inspected and checked against the packing list If there is a shortage or any evidence of damage do not attempt to use the equipment Contact the carrier and file a shipment damage claim A full report of the damage should also be reported to the JPS Customer Service Department The following information should be included in the report 1 Order Number 2 Equipment Model and Serial Numbers 3 Shipping Agency 4 Date s of Shipment The JPS Customer Service Department can be reached by phone at 919 790 1011 by fax at 919 790 1456 Upon receipt of this information JPS will arrange for repair or replacement of the equipment 2 5 RESHIPMENT OF EQUIPMENT If it is necessary to return the equipment to the manufacturer a Returned Material Authorization RMA number must first be obtained from JPS This numbe
23. 7 14 7 1 3 Setting The wad rte eR itte e Pa EUN RR Qu wae 7 14 7 1 4 Call OS Ging nate tet e e RU ete akt UD RR FER TEE T RR REFER RR ERN DR ge 7 14 78 RADIOCONTROL OPTION teret he E DPI HU Rape uet Pea Pre ente MER He dee 7 15 7 8 1 CONTROLLING THE RADIO VIA THE RTU 292 FRONT PANEL 7 15 8 SCHEMATIC 8 1 8 1 GENERA EU 8 1 LEE p CD REUN 9 1 JPS Communications Inc 6 m mu RTU 292 Operations Manual List Of Figures FIGURE 2 1 OUTLINE DIMENSIONS 2 2 2 2 1 00 0000000000000000000000000000000 0 2 18 FIGURE 2 2 CONTROL AND CONNECTOR LOCATIONS 1 1 2 1 2 0000000000 nannte 2 19 FIGURE 2 3 LOCATION OF INTERNAL OPTION SETTINGS 2 20 FIGURE 2 4 INTERNAL OPTION SETTING DETAILS cccsscccccceceesessscesccecsessnsececeeecseneaeaeceeeceesesaeeeesesenennsaeeeeees 2 21 FIGURE 2 5 AUDIO INTERFACE WIRING DIAGRAM 2 2 2 2 2 02 0000000000000000000000000 2 22 FIGURE 2 6 INTERFACE DETAILS ccccccccccessessscecececsesesccecececeeneueaececececsesauesecececeeeaaeaeeececsessssseseeecsesensaaeeeeees 2 23 FIGURE 6 1 HYBRID BALANCE TEST SET UP uuu cece ccccccccssccccceceesessesececececsesseaececececeesesaeceeececsesssnsseeeesceenesaseeeeees 6 21 FIGURE 6 2 V
24. CALL RING FACTORY SET TO MIDRANGE TONE PROMPT VOLUME LEVEL ROTATE CLOCKWISE TO INCREASE VOLUME OF TONE PROMPTS TRANSMIT AUDIO LEVEL ADJUST ROTATE CLOCKWISE TO INCREASE FACTORY SET TO 0dBm OUTPUT RECEIVE AUDIO LEVEL ADJUST ROTATE CLOCKWISE TO INCREASE FACTORY SET FOR PROPER OPERATION AT O dBm INPUT DC INPUT VOLTAGE SELECTION FACTORY SETTING 24 28 VDC Internal Option Setting Details 2 21 JPS Communications Inc RTU 292 Operations Manual Figure 2 5 Audio Interface Wiring Diagram JPS Communications Inc 2 22 s A Figure 2 6 RTU 292 Operations Manual Interface Details 2 23 JPS Communications Inc RTU 292 Operations Manual m mu 2 11 INSTALLATION CHECKLIST Table 2 20 Installation Checklist Provide suitable Mounting and Cooling See Section 2 5 Check AC Line voltage selection See Section 2 7 DC Operation needed See Section 2 7 Make Interconnections See Section 2 9 for External Interconnect Information Serial Remote Control needed Set Serial Remote Baud Rate with SW1 1 and 2 See RS 232 protocol in Section 5 Set TX RX Audio Levels if necessary See Table 2 1 and Section 2 10 Set Telephone Line Levels if necessary See Table 2 1 and Section 2 8 Are other Factory Default Settings correct for See Table 2 1 and Table 3 2 this system Make necessary changes as explained in sections 2 8 2 10 and 3 7 2 12 OPTIONS INSTALLATION AND CONFIGURATION See section 7 for
25. Communications Inc RTU 292 Operations Manual m mu 7 4 VMM 100 OPTION The VMM 100 VMR Module implements Voice Modulation Recognition VMR which enables the receive audio path when speech is present and disables it when speech is not present This module also implements a form of noise reduction known as dynamic peaking which reduces background white noise These features are implemented with a DSP circuit on the VMM board 7 4 1 VMM 100 Hardware The general purpose of the DSP hardware is to convert analog audio signals to the digital domain operate on and manipulate these signals digitally then convert the result back to analog 7 4 1 1 VMM 100 DSP Section The heart of the DSP section is the DSP chip itself a TMS320C25 The unit runs at 40 MHz and produces a 5 MHz signal at the U1 58 CLKOUT which supplies timing to PEEL U3 and ultimately to U2 the Analog Interface Chip U2 then supplies an interrupt to the 320C25 approximately every 130 microseconds which establishes the sample rate of about 8 kHz The DSP operating program is contained in EPROM chips U5 and U6 Two chips provide the necessary 16 bit wide architecture the high byte is contained in U5 and the low byte in U6 Static RAM chips U9 and 010 are used for temporary data storage during operation of the program All of the glue logic necessary to interface the DSP with the various peripheral chips on the board is provided by PEEL Programmable Electrically Erasable
26. Dial Command SD lt nn ALL gt lt 2 gt CR This command is used to program or review data in speed dial memory There are 99 locations in speed dial memory These range from 1 to 99 with location 0 being used by the system as scratch pad memory The keyword ALL may be used in place of the speed dial location to refer to all of speed dial memory The second argument allows the speed dial location to be programmed to the given number string Valid phone numbers contain the ASCII Text digits 0 9 as well as and If a period is entered in place of the phone number data the speed dial location will be erased The speed dial location can be reviewed by entering a in place of the phone number The phone number may contain up to 25 digits Expected Response Speed Dial Response Examples SD 1 5551212 CR Command to program location 1 with the phone number 555 1212 SD 1 5551212 EO CR Status showing that location 1 is programmed with the number 555 1212 SD 21 CR Command requesting the contents of speed dial location 21 SD 21 5551212 E0 CR Status showing that location 21 is programmed with the number 555 1212 SD ALL CR Command to delete all locations in speed dial memory SD 1 is empty CR Each speed dial location is reported as empty SD 2 is empty CR SD 99 is empty EO CR JPS Communications Inc 5 8 m mu RTU 292 Operations Manu
27. For P4 Jl P8 Keypad conn P9 P12 P16 J2 Rear Panel DC Input Spkr phones Spkr phones S1 Power switch Surface mt pcb Reference Designator C5 CL24 n CRLCR2 CR4 Sw1 2 3 4 Reference Designator C5 CL24 n CRI 4 RI 4 SW1 4 Reference Designator C5 CL24 CR3 4 CRL2 RL2 34 SW1 2 4 Reference Designator 040 main bd XXX is U8 DSP Module XXX is rev JPS Communications Inc RTU 292 Operations Manual Flow 5970506100 Part No 320010500 320020500 320100500 320101250 320101500 320102350 320152160 320220250 320220250 320220250 320272350 323100102 323470102 327102101 327103101 327104101 327104101 327104101 327105100 327474101 327474401 327682101 328332500 364003100 364004100 364007100 364010101 364016101 364040101 364040104 365003102 365004100 365007100 365008100 365010101 367009100 370002000 370006000 370006002 380035800 380080000 420000060 420001040 423058180 426040040 428041480 430062670 432052540 432053590 870504100 910103000 910223000 912101001 920000200 920537700 931074040 931074923 931743740 933074000 RTU 292 Main PCB Assembly Description Cap elect luF 5 0VDC Cap elect 2 2uF 5 0VDC Cap elect 10uF 5 0VDC Cap elect 100uF 25VDC Cap elect 100uF 5 0VDC Cap elect 1000uF 35 VDC Cap elect 1500uF 16VDC Cap elect 22uF 25VDC Cap elect 22uF 25VDC Cap elect 22uF 25VDC Cap elect 27
28. INTERFACE 2 7 Call cei rer rS TOR Call Logging CALL PROGRESS RESPONSES FROM THE RTU 292 Call Starting Response CALLING THE RTU 292 VIA THE OUTSIDE LINE 3 10 CALLING TIMER giu deed 3 16 Chassis Assembly Checking The Time And Command Summary essen COMMANDS SENT TO THE RTU 292 CONTINUOUS ADAPTATION Control and Connector Locations DC INPUT TERMINAL 3 4 DC Power Supply E 8 Dial Command DIAL MODE Dial Response DIAL BUSY GENERATORS 4 26 Dialing into the 292 sess 3 11 Dimensions is 2 18 DIP Switch iod d 9 Disconnect Command 5 5 Disconnect 5 13 Disconnecting 5 DTMF ACCESS FEATURE 7 11 DTMF Command eene 5 5 CONTROL 3 13 JPS Communications Inc RTU 292 Operations Manual DTMF Det CtOtz cto eec DTMF Generator Radio Control Commands 7 16 DTMF Response eeeeeerenenen eene 5 13 dynamic peaking i e ea ede Ee pg eee 7 6 EIA EE dedic Elapsed Time Response
29. Jumper JP1 selects whether the input is balanced or unbalanced In Balanced position the signal is fed to the primary of transformer T2 In unbalanced position the signal is fed to U20A through R110 and R111 which provides a unity gain AC coupled input of 47k impedance R110 and C59 are in the circuit for RF decoupling The secondary of T2 is connected to amplifier U20A configured as a high input impedance unity gain amplifier In balanced position Jumper JP2 determines the input impedance of the receiver input In low impedance position R112 is placed across the secondary of T2 to make a 600 ohm termination In high input impedance position R112 is removed from the circuit leaving only the 47k Ohm resistor R113 The output of U20A is fed to amplifier U20B a gain adjustable amplifier which sets the receiver input signal level The output of U20B is nominally at the level of 10dBm and the adjustment range of R116 allows 10 dBm to be produced at U20B 7 with input signals in the range of 40dBm to 10dBm 4 3 3 2 Transmitter Audio Output Gain adjustable amplifier U21A provides the audio output to the transmitter The adjustment range of R133 is set so that with 0 dBm audio at U21B 7 the signal on the secondary of T3 loaded with 600 Ohms can be adjusted between 10dBm and 40 dBm Amplifier U21A gets its input signal from mixer amplifier U21B which is fed by analog gates U22A B C and U23A and U23B These gates route prompt DTMF micropho
30. KEY pushbutton or the handset PTT button to key the transmitter The VOX switch can be left engaged if desired so that the operator can override the VOX at any time or the VOX may be disengaged so all keying occurs manually JPS Communications Inc 3 8 m mu RTU 292 Operations Manual 3 4 10 TRANSMITTER KEYING FULL DUPLEX SYSTEM In a full duplex system the transmitter can be held continuously keyed during a conversation because the system can receive and transmit at the same time Thus VOX is not required In this case the transmitter may be keyed from the RTU 292 by pulling either of its external KEY inputs low The Full Half Duplex dipswitch setting has no effect on transmitter keying 3 5 REMOTE KEY The RTU 292 contains a remote Key signal that can be activated at any time The unit will key the transmitter any time this input is pulled low while the power is on 3 6 SELF TEST The RTU 292 self test routine operates each time the unit is powered up This routine tests the non volatile RAM for out of range parameters and various functions of the DSP module The unit also performs a Walking LED test turning each of the front panel LEDs on in succession providing an indication of correct I O operation A successful self test will be indicated by the Positive Acknowledge tone prompt and if the Voice Prompt Option is enabled the RTU 292 Automatic Phone Patch greeting prompt Failure of the self test or failure of the DSP
31. PTT switch to use the telephone 2 To hang up press the TEL LINE PHONE button again The adjacent LED will turn off 3 4 5 PUTTING A TELEPHONE CALL ON HOLD Once a telephone call has been received or initiated and the TEL LINE PHONE LED is illuminated pressing the HANDSET PHONE button or the SPEAKER PHONE button will put the call on hold The call will not be cut off as long as the TEL LINE PHONE button is not pressed For example if the RTU 292 operator has made a telephone connection and wishes to contact a radio party to continue setting up the patch he may place the telephone call on hold and speak with the radio party using the handset as described in 3 4 6 3 4 6 USING THE HANDSET WITH THE RADIO Pressing the HANDSET RADIO button will connect the handset to the radio s audio lines associated LED will be on The receive audio will be heard in the earpiece and when the radio is keyed via the handset or front panel key switches the handset mic audio will be routed to the transmitter The SPEAKER RADIO pushbutton may also be used to monitor radio receive audio via the RTU 292 s front panel speaker 3 4 CONNECTING THE RADIO TO THE TELEPHONE LINE To patch the radio to the telephone line push the TEL LINE RADIO button to ON This will cause the adaptive hybrid to operate in the following manner 3 4 7 1 Initial Adaptation The two wire to four wire hybrid in the RTU 292 adapts to the phone line each time the TEL LINE
32. RTU 292 Operations Manual m mu TABLE 1 1 TABLE 1 2 TABLE 1 3 TABLE 2 1 TABLE 2 2 TABLE 2 3 TABLE 2 4 TABLE 2 5 TABLE 2 6 TABLE 2 7 TABLE 2 8 TABLE 2 9 TABLE 2 10 TABLE 2 11 TABLE 2 12 TABLE 2 13 TABLE 2 14 TABLE 2 15 TABLE 2 16 TABLE 2 17 TABLE 2 18 TABLE 2 19 TABLE 2 20 TABLE 3 1 TABLE 3 2 TABLE 5 1 TABLE 5 2 TABLE 5 3 TABLE 5 4 TABLE 6 1 TABLE 7 1 TABLE 7 2 TABLE 7 3 TABLE 7 4 TABLE 7 5 TABLE 7 6 TABLE 7 7 TABLE 7 8 TABLE 7 9 List of Tables EQUIPMENT AND ACCESSORIES SUPPLIED c csccesscssecssecssecssecsscesseeesesecesseesecssceaeceaecssecsaecsaeaes 1 4 OPTIONAL EQUIPMENT NOT SUPPLIED cccccsccssccsseessecsseescesscesscesecesecesecssecssecsaecsesesesesseeeseeeeens 1 5 RTU 292 SPECIFIGATIONS a i hii et ett eve rr ote C ERE 1 6 RTU 292 FACTORY DEFAULT SETTINGS ccccccccsccesscssecssecssecssecssccsseceseseeesseesscessceaecsaeessecsaecsaeeaes 2 3 RECOMMENDED PHONE LINE SETTINGS 2 6 TELEPHONE SEND RECEIVE LEVELS ettet eer 2 6 VOA HAN OTME a ended t te t be teas HE a teo 2 7 VOX SENSITIVITY rta e tete ae tt s t rei a eee meten A 2 7 DIAL MODBE nit Sa rri te re d me b pH Ei e 2 8 FULLIHALE DUPLEX antro tette met b mei ctr 2 9 BAUD ATE zione ftat mittet lis n lupiter OE Dt 2 9 RADIO CONTROL 1n trie tn ett uer havens nte bete Alena ad 2 9 PASSWORD PROTECT
33. Toggle Press once to key the next press will unkey etc To prevent simultaneous use of VOX and Manual Keying if VOX was enabled when 0 is first entered it will be shut off VOX Toggle If VOX is on 1 will turn it off If VOX is off 1 will turn it on VMR Toggle If VMR is on 2 will turn it off If VMR is off 2 will turn it on VMM 100 Option must be installed Noise Reduction Toggle If Noise Reduction is on 3 will turn it off If it s off 3 will turn it on VMM 100 Option must be installed Security Mode Toggle If Security Mode is on 4 will turn it off If it s off 4 will turn it on Security Device Option must be installed not currently available Page the Operator make a call to the RTU 292 operator at the front panel keypad handset 6 Page the Local Phone Operator this command can obviously made only by a connected telephone and not by the Local Phone Reserved for future use Radio Control Mode Requires optional radio control S W Use this command to enter the Radio Control Mode dipswitch SW1 3 must also be ON to enable this mode This mode enables control of a companion Motorola URC 200 radio See Section 7 If the RTU 292 is in the Radio Control Mode will return it to standard RS 232 control mode See Table 7 6 Enter the programming mode If passwords are enabled the user will be prompted for the system password and not allowed to enter the programming mo
34. a DTMF command received when the RTU 292 is still on hook A hardware related fault was detected 2 ES The previous command requested a resource which is not available An example of this would be a DIAL command sent to the Local Phone option when the Local Phone option is not JPS Communications Inc 5 18 m mu RTU 292 Operations Manual 6 Maintenance and Repair 6 1 GENERAL Included in this section are the Test Procedures and performance evaluation criteria for the supplied equipment Also provided is a Fault Analysis Table Table 6 1 to aid in isolating a fault Table 6 2 identifies replaceable parts 6 2 PREVENTIVE MAINTENANCE There are no preventive or periodic maintenance requirements for this equipment 6 3 REPAIR OR REPLACEMENT The repair or replacement of damaged and or defective parts generally requires techniques that are standard in the industry Carefully examine the equipment to determine the most correct and least time consuming method required to make the repair 6 3 1 GENERAL PRECAUTIONS AND NOTES 1 Disconnect power from the unit before attempting any repair or replacement of components 2 Replace defective connectors only with identical items 3 Carefully observe lead dress and component orientation when repairing circuits Keep components leads as short as possible 4 Reference to the component side of a printed circuit board denotes the side of the board on which the components are mou
35. adapted the RTU 292 will play the ACK acknowledge tones and give the Ready voice prompt if the Voice Prompt Option is installed If the DSP cannot adapt the unit will play the ERROR tone and give a VOX Unavailable voice prompt If VOX is unavailable the caller must give a KEY command before speaking and then give an UNKEY command turn off the transmitter and listen to the reply see 3 7 3 4 3 11 JPS Communications Inc RTU 292 Operations Manual m mu 3 7 3 4 The RTU 292 Enters the COMMAND Mode After the RTU 292 completes the adaptation sequence it enters the Command Mode and waits for the caller to respond with commands In Command Mode the user may enter DTMF commands by pressing a number on the telephone s keypad The unit stays in Command Mode until the caller gives the sequence to hang up If the caller gives an incorrect command the unit plays the ERROR tone and gives the Invalid Entry voice prompt When the RTU 292 is used in the command mode it is connected to a radio system that is ready to respond to the basic RTU 292 commands At a minimum the radio must be turned on and set to the appropriate frequencies and the radio audio and PTT input lines must be connected to the RTU 292 One of the dipswitches allows the RTU 292 to be put into the Radio Control Mode via a DTMF command This mode enables the RTU 292 to control a companion Motorola URC 200 radio via its RS 232 serial port See Tables 2 9 3 1 and 3 3
36. and then turn the unit power back on 2 8 1 PROGRAMMING MODE SETUP PARAMETERS Some of the RTU 292 setup options are selected by entering commands by a connected telephone or Local Phone Option telephone set Since these parameters are set after a connection is made they are detailed in section 3 See Table 3 2 Programming Mode DTMF Commands 2 8 2 SETTING TELEPHONE SEND AND RECEIVE LEVELS The levels of the audio signal that are sent into Send and received from Receive the telephone line are adjustable via SW2 switches 1 through 3 on the RTU 292 Main Board The levels are adjustable from 21 dBm 600 Ohm to 0 dBm in 3 dB steps The dipswitches simultaneously set the Send and Receive levels 2 5 JPS Communications Inc RTU 292 Operations Manual m mu Table 2 2 Recommended Phone Line Settings Type of System Send amp Receive Levels Dial Up lines in a U S Domestic phone system Dial Up lines in most non U S telephone systems PBX Systems 12 dBm Field Wire not connected to a telephone network When using the RTU 292 in a domestic U S dial up telephone network the MAXIMUM level allowed into a telephone line at the subscriber end is 9 dBm Putting more level into the line than this will NOT increase performance but will result in distortion crosstalk into other circuits and the telephone company may disconnect the call When operating into a PBX system the level should be set at 12 dBm Higher levels than the
37. are 0 9 the characters and The comma character is used to produce a 2 second pause while dialing No spaces are allowed in the number string Examples DIAL 5551234 EO CR Status returned indicating that the number 5551234 was dialed DIAL OPER CR Status returned indicating that the call has been placed to the operator front panel 5 4 5 Disconnect Response DISC Exx CR Type Multi Response To Disconnect Command Telephone Command Disconnect System Initiated Disconnect This response indicates that the PSTN Operator or Local Phone has been disconnected Examples DISC CR Status returned indicating that the PSTN was disconnected 5 4 6 DTMF Response DTMF number string Exx CR Type Synchronous Response To DTMF Command This response indicates that DTMF was generated for the given number Valid digits for the number string are 0 9 the characters The comma character is used to produce a 2 second pause No spaces are allowed in the number string Examples DTMF 1234 CR Status returned indicating that DTMF was generated for the number 1234 DTMF 1234 E6 CR Error status indicating that the unit could not generate at this time Most likely due to the fact the unit is still on hook 5 13 JPS Communications Inc RTU 292 Operations Manual m mu 5 4 7 Elapsed Time Response Connection dropped elapsed time h
38. be sure that remaining balanced audio terminal is grounded See 2 10 for audio adjust procedures Excessive audio level from the radio receiver Adjust R116 the RX Input potentiometer CCW If LED still flashes too often after R116 is fully CCW lower audio level at receiver See 2 10 for audio adjust procedures The RTU 292 is having difficulty during initial adaptation cycle Probable noise conversation dial tone or busy signal on the phone line while the unit is trying to adapt The RTU 292 was not able to complete its initial adaptation cycle Probable extreme noise dial tone busy signal or other type of signal present on the phone line Be certain that a good telephone connection is obtained before pushing the TEL LINE PHONE button The VOX is disabled while the TEL LINE RADIO is not ON The VOX is disallowed if the unit has not been able to adapt Excessive audio level from the receiver or overdrive of the phone line If the PEAK LED is flashing normally on receiver voice peaks see 2 10 check the setting of the telephone send and receive levels Also extremely bad phone line is possible 6 24 E u RTU 292 Operations Manual 5970501000 Part No 153080001 360003001 362005001 362007000 362008000 370002001 632000010 810811800 1110250002 1610501102 1940120086 1946220001 5962102000 5930302800 Part No 320220250 327104101 364010101 1221062201 1221062202 1943000003 5930302700 Part No 32022
39. commands except 3 99 and the user may substitute the DTMF character in place of the Followed By data to query the radio for its current setting For example if the sequence 0 1 is entered the RTU 292 will command to the radio to select channel 1 However if the sequence 0 is entered the RTU 292 will play back the current channel number The Voice Prompt Option is required to take advantage of this playback feature JPS Communications Inc 7 16 m mu RTU 292 Operations Manual 8 SCHEMATIC DIAGRAMS 8 1 GENERAL This section has all RTU 292 schematic diagrams They include Figure 8 1 Front Panel Schematic A single sheet showing the switch boards and other front panel components Figure 8 2 Main Board Schematic This nine page schematic details all components on the main board Notes are included to differentiate the schematic when the board used in different JPS products the RTU 292 the RTU 300 desktop version and the RTU 285 special application version not for general sale There are two different power supply schematics On the eighth page is the schematic for the power supply configuration used with the RTU 292 or RTU 300 The ninth page is the power supply configuration for the RTU 285 only Figure 8 3 DSP Module The DSP Module that plugs into the Main Board via a pair of in line 20 pin headers has two schematic pages Figure 8 4 Option Interface Board This is a single sheet schematic
40. eliminating the need to be concerned about the polarity of the phone line Transistors 1 and Q2 are connected as a constant current load and C3 insures that the load does not respond to audio frequencies so that the load appears as a very high AC impedance in parallel with the transformer secondary When the load is in operation the DC voltage from TP1 to TP2 will be approximately 4V to 8V The phone line connections are made via J1 or the terminal block J12 to relay K1 which when the power is off or the unit is in Disconnect disconnects the phone line from the internal circuitry Components L1 L2 and associated capacitors form Pi Section filters to remove RF from the normally unshielded phone lines is metal oxide varistor that limits high voltage transients that might appear on the telephone line 4 3 2 2 Telephone Receive Circuits Amplifier U2A is the telephone receive amplifier which is arranged as a non inverting stage and gets its input via R11 from transformer T1 U2B is gain adjustable via a combination of input and feedback resistors selected by analog gates U6A U6D The gain distribution is set so that with a 600 Ohm load on the telephone line terminals the PSTN level stated in the Input Signal Level Table will produce a 12 dBm signal at U2B 7 Note that the telephone send signal appears mixed with the telephone receive signal at U2A 1 Furthermore the amount of send signal mixed in depends on the telephone line im
41. for the narrow PCB that resides in the side of the options tray and provides an interface between the various standard option boars and the main PCB Figure 8 5 Voice Prompt Option Board Figure 8 6 Local Phone Option Board Figure 8 7 VMM 100 Option Board 8 1 JPS Communications Inc RTU 292 Operations Manual Blank Page JPS Communications Inc 8 2 RTU 292 Operations Manual 3 14 3 15 3 14 3 15 RDUM n a a E M oS 3 15 4 Wire Operation renen cce eee roter re Re 3 15 AG Power Supply ia eie edades 4 24 Accessory 1 4 Adaptation 9 3 6 2 2 0200 000 0 3 7 Adaptive Hybrid 4 23 Adapts To The Phone Line esee 3 11 After the Call Begins seseeeeeee 7 12 7 13 ALIGNMENT ien etit oen erit de 6 1 Alternate Hybrid Test 6 4 ASSEMBLIES 55e leti eit ie petere 1 2 AUDIBLE RING BUTTON 23 3 Audible Ring 5 3 AUDIO BUS 4 19 Audio Delay Audio Interface Wiring Diagram sess 2 22 AUDIO LEVEL SETUP AND ADJUSTMENTS 2 15 AUTO ANS BUTTON 3 3 Auto Answer Command sss 5 3 Auto Answer 5 12 AUTOMATED OPERATION 3 9 BALANCED UNBALANCED RADIO
42. in DSP software that outputs digits to the telephone line for dialing The output is from J13 32 DTMF which is routed to gate U9D so it may be mixed with the signal to be sent to the telephone line in 4 23 JPS Communications Inc RTU 292 Operations Manual m mu 4 3 POWER SUPPLY The power supply is detailed in page 8 of 9 Figure 8 2 It supplies regulated DC voltages of 5V 12V 5V and 12V from both AC and DC inputs 4 3 7 1 AC Power Supply The AC power supply is a conventional passive regulator supply with a small PC mounted line transformer T4 which has dual primaries for 115 or 230 VAC operation and has dual 15 VAC secondaries which are wired in parallel T4 and bridge CR36 along with capacitors C120 and C121 are configured as a positive full wave circuit supplying unregulated BUS voltage about 20VDC to the 12V and two 5V regulators One 5V regulator U72 feeds the RTU 292 standard circuits The other regulator U71 feeds only the assemblies on the option tray The positive regulators are standard three terminal types using a finned heatsink for cooling The negative voltage is supplied by switching regulator U73 which converts the BUS voltage to 12V adjustable by R212 4 3 7 2 DC Power Supply The DC power supply allows the RTU 292 to be powered from either a 12V or 24V DC source as well as the standard AC supply line input Slide switch S6 configures the supply for either 12V or 24 28V opera
43. installation instructions for all field installable options Section 7 also explains how to set up any options that have configuration switches jumpers potentiometers etc For any options not covered in section 7 refer to custom notes supplied with the RTU 292 or the option or contact JPS for information End of Section 2 JPS Communications Inc 2 24 m mu RTU 292 Operations Manual 3 1 GENERAL This section contains information and instructions required for proper operation of the RTU 292 3 2 FRONT PANEL CONTROLS INDICATORS AND CONNECTORS 321 MAIN POWER SWITCH The Main Power switch controls the external DC power to the unit The switch is a locking toggle type to prevent inadvertent operation 3 2 2 HEADPHONE JACK This front panel jack accepts a standard 1 4 inch diameter monaural phone plug The output will drive low medium or high impedance headphones The phones audio level is adjustable via the PHONES VOLUME control on the right side of the panel 3 2 3 HANDSET JACK This front panel jack is a standard 6 pin RJ12C jack that connects the handset to the unit 3 2 4 HANDSET The handset allows sending and monitoring audio to and from either the telephone line the radio or both depending on the HANDSET PHONE and HANDSET RADIO pushbutton selections The handset also has a PTT Push To Talk switch to key an associated radio The handset PTT switch is active only when any of the following functions are selected assoc
44. module at any time is indicated by a long Negative Acknowledge tone and a constantly blinking PEAK LED The radio connect functions of the unit will not operate although the telephone may continue to operate 3 7 AUTOMATED OPERATION The RTU 292 can patch the telephone line to a radio system completely unattended when in the Automated Operation Mode To enter this mode simply press the AUTO ANSWER pushbutton The unit will signal its present status and request remote operator responses through the use of Tone Prompts and if equipped with actual voice messages called voice prompts 3 7 1 TONE PROMPTS The RTU 292 s tone prompt sequences and their meanings are 3 7 1 1 Positive Acknowledge ACK When the RTU 292 wants to signal an acknowledge it will play 1 short high pitched tone followed by 1 short low pitched tone The RTU 292 usually plays an ACK in response to a user initiated command ACK means that the command was received and was legitimate 3 7 1 2 Negative Acknowledge ERROR When the RTU 292 wants to signal a negative acknowledge or error it will play 1 long low pitched tone An ERROR is usually played as a response to incorrect user entry or following the receipt of an illegitimate command that could not be executed 3 9 JPS Communications Inc RTU 292 Operations Manual m u 3 7 1 3 Waiting For Input QUERY When the RTU 292 needs user input it will play 1 short low pitched tone followed by 1 short high pitched t
45. only if the Voice Prompt Option is installed See section 3 7 for an explanation of the Voice Prompt feature operation and section 7 2 for field installation The factory default setting disabled if the Voice Prompt Option is not installed and enabled if it is Table 2 11 Voice Prompts Enable swig 2 8 14 LOCAL PHONE LOCAL PHONE RING THROUGH Dipswitch SW1 7 enables or disables the RTU 292 Local Phone Option This feature should be enabled only if the Local Phone Option is installed The factory setting is Disabled SW1 7 Off if the Local Phone Option is not installed and enabled SW1 7 On if it is See section 3 7 for an explanation of Local Phone Option operation and section 7 3 for field installation instructions SW1 8 enables the Local Phone Ring Through feature This causes the local phone to ring whenever a call is received by the RTU 292 via the PSTN input When disabled the local phone may still be used to send and receive calls but will not ring when a call is received Set SW1 8 to On to enable Local Phone Ring Through and Off to disable this feature This switch should always be set to Off disabled when the Local Phone Option is not installed The factory setting is On enabled when the Local Phone Option is installed and Off disabled otherwise JPS Communications Inc 2 10 m _ RTU 292 Operations Manual Table 2 12 Local Phone Enable SWI 7 Local Phone Disi Enabled Table 2 13 Local Phone Ringthroug
46. robust connection to an unquiet phone line is about the only case where the RTU 292 will fail to adapt as the hybrid has the ability to adapt to line conditions from a short circuit to an open circuit as well as the impedance presented by the extremely complex distributed network of a telephone line 3 4 7 2 CONTINUOUS ADAPTATION Once the initial adaptation is complete and the unit begins operating hybrid adaptation proceeds continuously using receiver audio sent down the telephone line the noise burst is not needed again This feature enables the RTU 292 to automatically adapt its hybrid balance to changing line conditions 3 448 MANUAL PHONE PATCH PROCEDURE A telephone patch establishes a communications link between a distant radio a local radio interfaced directly to the RTU 292 via the P1 Radio connector and a distant telephone that is connected to the unit via the telephone line This distant telephone will be patched through the local radio set to the distant radio set allowing communication directly between the distant radio set and the distant telephone Begin with the RTU 292 installed and its power on 3 4 8 1 The operator first establishes a link between the local radio set and the distant radio set using the RTU 292 s handset with the radio as described in paragraph 3 4 6 Alternatively the operator may have received a radio call from a distant radio party wishing to make a phone patch Using the RTU 292 s internal tel
47. the CPU card Available baud rates are 300 1200 2400 and 9600 All commands to the RTU 292 and responses sent from the RTU 292 use standard ASCII characters All remote commands are terminated with a carriage return CR and optionally a line feed LF Status information returned from the RTU 292 will always be preceded by a character and is also terminated by a CR This protocol allows control and monitoring of the RTU 292 via a dumb terminal or a computer program The commands issued to the RTU 292 are not case sensitive 5 3 COMMANDS SENT TO THE RTU 292 The following section describes the operation of each of the RTU 292 remote control commands All commands have the format cmd data data data CR The first string is the command string The command string must not be preceded by any space characters There is at least one blank space character after the command string Any data that is required by the command follows next Multiple data sections are delimited by at least one space Most commands require that data be presented in a specific order Finally the command is terminated by a Carriage Return character CR Line feed characters may be included after the Carriage Return but they are not necessary Examples Turn on the Speaker Radio audio SPKR_RAD ON CR Get the firmware revision number VER CR 5 1 JPS Communications Inc RTU 292 Operations Manual E When a command is sen
48. the system is denied unless a user enters the correct password The same password applies both to access via telephone and via a radio if the DTMF Radio Access feature is used Users are given three tries to correctly enter the system password before the RTU 292 terminates the call attempt and returns to its waiting state The system assists the user in entering the password by the use of Voice and Tone Prompts if the Voice Prompt Option is installed or simply with Tone Prompts The factory default password is 1 2 3 4 and this password can be changed to any DTMF or numerical value up to 10 characters in length To change the password first enter the programming mode by entering 9 9 If passwords are currently enabled it will be necessary to enter the correct password to continue programming From the programming mode enter 1 x x x where x x x is the new password up to 10 characters long Next enter to leave the programming mode 3 7 8 INACTIVITY DISCONNECT TIMER The inactivity disconnect timer ensures that the system does not remain locked up on a completed call if system users forget to or are unable to terminate a call by normal means The inactivity timer samples audio from both the radio and the telephone If no activity is detected for a time equal to the Inactivity Disconnect Timer setting the RTU 292 will notify the users by three short beeps that they have five seconds to respond or the call will be
49. ues ara ue a i ica eee 5 4 5 3 5 Di liCoraimand 52 nat lisi tr d t 5 4 5 3 6 Disconnect Command ia eaae apin 5 5 5 3 7 MO TIME Commande rots M rr 5 5 5 3 8 Handset Phone Command sessi rn enne 5 6 5 3 9 Handset Radio Command sse eene enne nennen eene nnne 5 6 5 3 10 Speaker Phone Command sse eere ener enne nnne nnne 5 7 5 3 11 Speaker Radio Command sess eee enne trennen nennen enne 5 7 5 3 12 Speed Dial Command eene enne nnne 5 8 5 3 13 Tel Line Phone Command sssssssssssesseseeeee eene enne 5 9 5 3 14 Tel Line Radio 5 9 53 5 IimeCommand uuo OBI tere idm Un E ufi e 5 10 5 3 16 Software Version Comma d sssrinin riesi e ai E E eene nnne eren enn ener 5 10 5 4 STATUS RETURNED FROM THE RTU 292 enne neret eren neret 5 11 5 4 1 NULL Responses ies aci er tette ete PEE ER E ETUR E CHR VEO EPOR e REX 5 12 5 4 2 Auto Answer 5 12 5 4 3 Call Starting Resporse aont ne cede sg E ue ee Pe TRE
50. 00uF 35 VDC Cap disc cer 10pF 5 NPO 100V Cap disc cer 47pF NPO 100V Cap mylar InF 10 100V Cap mylar 0 01uF 10 100V Cap mylar 0 1uF 10 100V Cap mylar 0 11 10 100V Cap mylar 0 10 10 100V Cap mylar 1 uF 10 100V Cap mylar 0 47uF 10 100V Cap mylar 0 47uF 10 400V Cap mylar 0 0068uF 10 100V Cap poly 3 3nf 50V Conn Header 3 pin single row Conn Header 4 pin single row Conn Header 7 pin single row Conn Header 125bd 10pin retain Conn Header Male 16 Pin retain Conn Header 125 40 pin retain Conn header 20x2 0 250 spc male Conn 3 pin w notches 156 center Conn pcb 4 x 1 friction lock Conn Header 7 pin friction lock Conn PCB 8 x 1 friction lock Conn header MTA 156 10 pin Conn DB9 shielded male pc mount Conn misc 2 pin jumper Conn RJ11C Modular Jack pc mount Conn RJ12C Mod Jack PC mt Crystal 3 579545 MHz Crystal 8 000 MHz Diode Bridge 600V 1A Diode Bridge 20 PIV 400 VW 3A Diode Schottky 1N5818 1A 30V Diode rect 1N4004 400V 1A Diode Signal 1N4148 Diode trans sup 1N6267 6 8V 5W Diode Zener 1N5254 27V Diode Zener 1N5359B 24V Heatsink T0 220 black 0 85 high Inductor molded small 10uH 596 Inductor molded small 22uH 596 Inductor pwr 100uH large Insulator pad for crystal Insulator silpad IC dig 74HC04N hex inverter IC dig MM74C923N 20 key encoder IC dig 74HC374N Oct D FF 3
51. 0250 327104101 364010101 1221062202 1820271000 1943000003 5930302500 Part No 320220250 327104101 364010101 1221062200 1221062202 1820271000 1943000003 Part No 934272XXX 6934020XXX Table 6 2 Chassis Assembly Description Speaker 8 ohm 3 sq Conn MTA 156 3 pin receptacle Conn circular pnl mt receptacle Conn cable 7 pin AMP Conn cable 8 pin AMP Conn barrier strip 2 position AC Filter and Fuseholder Assy Handle 25 x 1 25 x 2 75 mtg ctr Knob blk w dot 250ID Pot 5K lin 1 4 panel mount Keypad Molded Legend 3 x 4 Sw lock toggle DPDT 6A Silver DSP Module Pcb Assembly Telephone Line Switch Assembly Description Cap elect 22uF 25VDC Cap mylar 0 10 10 100V Conn Header 125bd 10pin retain LED rt angle pe mnt green LED rt angle pc mnt Yel Sw push mom 30VDC 4A Handset Switch Assembly Description Cap elect 22uF 25VDC Cap mylar 0 10 10 100V Conn Header 125bd 10pin retain LED rt angle pc mnt Yel Resistor carb 1 4w 270 ohm Sw push mom 30VDC 4A Speaker Switch Assembly Description Cap elect 22uF 25VDC Cap mylar 0 10 10 100V Conn Header 125bd 10pin retain LED rt angle pc mnt Red LED rt angle pc mnt Yel Resistor carb 1 4w 270 ohm Sw push mom 30VDC 4A Programmed Ics Description IC dig 27C256 32kx8 EPROM IC dig 29C010 6 25 Replaceable Parts List Reference Designator LS1
52. 2000 Resistor carb 1 4w 1300 ohm R211 1820152000 Resistor carb 1 4w 1500 ohm R115 132 1820153000 Resistor carb 1 4w 15K ohm R8 55 57 58 62 210 1820183000 Resistor carb 1 4w 18K ohm R2 4 37 38 39 40 1820202000 Resistor carb 1 4w 2000 ohm R200 1820204000 Resistor carb 1 4w 200K ohm R73 81 154 1820221000 Resistor carb 1 4w 220 ohm R91 93 1820222000 Resistor carb 1 4w 2200 ohm R61 65 90 140 150 153 160 1820223000 Resistor carb 1 4w 22K ohm R13 19 24 33 64 66 70 71 1820223000 Resistor carb 1 4w 22K ohm R79 118 120 121 128 130 144 1820392000 Resistor carb 1 4W 3900 ohm R110 1820470000 Resistor carb 1 4w 47 ohm R202 1820471000 Resistor carb 1 4w 470 ohm R99 167 208 1820472000 Resistor carb 1 4w 4700 ohm R6 9 26 53 60 96 1 17 134 155 1820472000 Resistor carb 1 4w 4700 ohm R159 172 174 179 201 209 1820473000 Resistor carb 1 4w 47K ohm R113 143 182 183 193 196 1820473000 Resistor carb 1 4w 47K ohm R30 31 35 75 83 87 100 111 1820512000 Resistor carb 1 4w 5100 ohm R122 1820513000 Resistor carb 1 4w 51K ohm R114 1820561000 Resistor carb 1 4w 560 ohm R1 34 112 135 1820621000 Resistor carb 1 4w 620 ohm R67 68 69 1820682000 Resistor carb 1 4w 6800 ohm R22 54 JPS Communications Inc RTU 292 Operations Manual 5970506100 Part 1820912000 1821102000 1826020000 1827400050 1828759030 1829101040 1920280000 1920520000 1941008000 1944020001 2020016001 2021334000 20400
53. 292 Operations Manual 5 4 STATUS RETURNED FROM THE RTU 292 The following section describes the various responses the user may expect from the RTU 292 The format of a response string is data data data Exx CR There are 3 types of responses e Synchronous the response is given as a result of receiving a specific command e Asynchronous the response is given because of some change in operating status in the RTU 292 that was not directly due to a command being issued In this case the RTU 292 simply volunteers this information without being asked for it e Multi the response may be given as a result of a command being issued to the RTU 292 or because of a change in the RTU 292 operating status Each response always begins with a 96 synchronizing character This is followed by a response name string There is no space between the sync character and the response name The response name identifies the information to follow In the case of a Synchronous response the response name is often the same as the previous command name Any response data will follow the response name string There is at least one space between each data section Most data is presented in a specific order The last data section is always the response error code The error code takes the form Exx where xx is a number The various error conditions are reflected in this number The error response EO signifies that there were no e
54. 3 2 rrr ere Rete CHE 3 4 3 3 7 Pl AC POWER GONNEGCHTOB 3 etii pere e ede e e CREE eee s 3 4 34 OPERATION eie reee CE RET RU rt ROT RC eI ERE IER 3 5 34 1 OPERATION OVERVIEW o re UR Rr pe e m tie ERE de 3 5 3 4 2 USE OF THE RTU 292 SPEAKER TO MONITOR AUDIO e ences ene eee 3 5 3 4 3 PLACING A TELEPHONE CALL E 3 5 3 4 4 RECEIVING A TELEPHONE CAL nrimo er E 3 6 3 4 5 PUTTING A TELEPHONE CALL ON HOLD enn enn enne enne 3 6 3 4 6 USING THE HANDSET WITH THE eene eee en ener 3 6 3 4 7 CONNECTING THE RADIO TO THE TELEPHONE LINE eee 3 6 3 4 8 MANUAL PHONE PATCH PROCEDURE eee eene enne enne nennen 3 7 3 4 9 TRANSMITTER KEYING HALF DUPLEX SYSTEM eee enn 3 8 3 4 10 TRANSMITTER KEYING FULL DUPLEX SYSTEM eee nens 3 9 35 REMOTEKEY 3 9 3 6 SELF TEST nie tree tg e censuses atures E O E T ENE E E stuvounesting 3 9 37 AUTOMATED OPERATION ere b eri Re 3 9 3 7 1 TONE PROMPTS itenim E D tete ae e Ur e 3 9 3 7 2 VOICE PROMPTS tp idees tte iem t ee HE ina rte tet ee 3 10 3 7 3 CALLING THE RTU 292 VIA THE OUTSIDE LINE eee en 3 10 3 7 4 PLACING A CALL IN THE COMMAND eee eee rennen 3 12 3 7 5 TERMINATING CALD sitet tec Pied e te eda 3 12 3 7 6 DTMECONTROE COMMANDS eret e
55. 4 RTU 292 OPTIONS eee 7 1 VOICE PROMPTS ENABLE v NR PED de 7 2 LOCAL PHONE ENABLES oneer terre pn n Re e RAP PG RC E ERIGI HEO TU 7 4 LOCAL PHONE RINGTHROUGH reporte e erroe ERE OE HEC m REUS 7 4 LOCAL PHONEDTMF GOMMANDS indice etre RET ER TR RET ae 7 5 VMM 100 SPECIFICATIONS 2 2 2 2 02 2200000000000000000000000000 tret tree nne 7 9 VMM 100 CONNECTOR INFORMATION 9 221222 4 000400000000000000050000 4 7 10 VMM 100 SWITCH FUNCTIONS ccccccccsscesscesecssecssecssccssecsesessecssesesesssesscnscaeceaecssecssecsaecsseeseeegs 7 10 RADIO CONTROL COMMANDG cccscesscesscesscesecsecssecssccsseesseessesesesscesscascnaecssecssecsseesaeees 7 16 JPS Communications Inc 8 RTU 292 Operations Manual Adaptation DIP Switch Full Duplex Half Duplex Hangtime Simplex Squelch Glossary The process whereby the RTU 292 DSP algorithms detect reflected signal information in a connected line and tune the DSP hybrid for a broadband null with minimum reflection Carrier Operated Relay A receiver signal that gives a positive indication that a carrier or signal is being received and that the receiver is unsquelched Same as COS Carrier Operated Squelch See COR Continuous Tone Controlled Squelch System A squelch system using EIA Standardized sub audible tones in the 67Hz to 250Hz frequency ra
56. 54000820 IC op amp TL082CP dual biFET U1 3 13 15 16 20 21 956005550 IC Timer NE555 U30 31 32 958010720 IC V reg LT1072CT Switching Reg U73 958078050 IC V reg MC7805ACT 5VDC U71 72 958078120 IC V reg MC7812ACT 12VDC U70 959002120 IC Inr DG212CJ Quad Analog Gate U4 5 6 8 9 18 19 22 23 33 959005720 Inr 572 Dual Compandor 014 959043500 IC Inr 4335 6 pin Opto isolator U7 11 12 959077051 IC Inr TL7705ACP V superv U45 1221062200 LED rt angle pc mnt Red CR24 1610102000 Pot 1K single turn trimpot pcb R212 1611502000 Pot 25 turn 5K vert pc R156 158 1611503000 Pot 25 turn 50K vert pc R116 133 1810012014 Relay low pwr DPDT 12VDC K1 K2 1820000000 Resistor carb 1 4W 0 ohm R131 168 171 176 1820010000 Resistor carb 1 4w 1 ohm R15 16 94 1820100000 Resistor carb 1 4w 10 ohm R14 92 1820101000 Resistor carb 1 4w 100 ohm R59 63 98 175 1820102000 Resistor carb 1 4w 1000 ohm R50 51 52 95 97 1820103000 Resistor carb 1 4w 10K ohm R185 192 197 198 211 1820103000 Resistor carb 1 4w 10K ohm R119 136 141 146 165 166 180 1820103000 Resistor carb 1 4w 10K ohm R7 10 11 12 17 18 21 32 41 42 1820104000 Resistor carb 1 4w 100K ohm R137 139 142 152 157 161 164 1820104000 Resistor carb 1 4w 100K ohm R20 23 25 27 36 72 74 76 77 1820104000 Resistor carb 1 4w 100K ohm R78 80 82 84 85 86 89 123 127 1820105000 Resistor carb 1 4w 1Meg ohm R56 88 145 170 1820124000 Resistor carb 1 4w 120K ohm R151 182013
57. 80200 2043041240 2047070000 RTU 292 Main PCB Assembly continued Description Resistor carb 1 4w 9100 ohm Resistor carb 1 2w 1000 ohm Resistor Varistor RMS200V Resistor ww 5W 40 ohm Resistor pwr ox 3W 7 5 ohm Resistor Pack 9x100K 10 pin SIP Socket IC non ret tin 28p WDIP Socket IC non ret 52 pin PLCC Sw pcb SPSTx8 dip Sw slide DPDT 6A 125VAC Xfmr audio 1 1 min Xfmr Pwr 115 230 VAC 34 VAC 700mA Xstr bipolar darl MJE 802 NPN Xstr bipolar sml sig 2N4124 NPN Xstr Fet n channel 2N7000 JPS Communications Inc 6 28 Reference Designator R3 5 28 29 R207 RVI R203 204 205 206 R213 214 2 3 4 040 For U46 SWLSW2 S6 TLT2 T3 T4 Q1 24 Q2 Q3 8 Q10 23 25 26 m mu RTU 292 Operations Manual 7 RTU 292 Options 7 1 GENERAL Included in this section are installation instructions for field installable RTU 292 options and set up instructions for all options that have configuration dipswitches jumpers potentiometers etc Operational instructions are provided for all options other than the Voice Prompt Option this frequently used options is explained along with standard unit operation in section 3 JPS may be able to install a software option by connecting with your existing RTU 292 via telephone request this service when ordering Spares kits and the 19 Rack Mount Kit are listed in section 1 7 1 4 Special Software Versions The options listed in the section may
58. AIR OR Ier e 6 19 6 3 1 GENERAL PRECAUTIONS AND 122 202 0 47400 400000000000000000000000000000000000000031 6 19 6 4 ALIGNMENT etre ete e RISE RORIS S 6 19 6 5 PERFORMANCE TESTING 5 rete erret repe HET etie ere ee ERR uen 6 19 6 5 1 TEST EQUIPMENT REQUIRED E R che 6 19 6 5 2 HYBRID BALANCE MEASUREMENT seniorene eene 6 20 6 5 3 VOX SENSITIVITY MEASUREMENT sees 6 23 T 81102292 pe 7 1 74 GENERA Divs K 7 1 7 1 1 Special Software Versions ciet eie eee apetece e 7 1 E2 VOICE PROMPT OPTION reti ri eee teint e eese ree inn 7 2 7 2 1 INSTALLATION AND CONFIGURATION enne nnne enne 7 2 7 2 2 OPERATION ete se cea x EP pP Eee PEE 7 2 3 LOCALE PHONE OPTION sis 7 4 7 3 1 LOCAL PHONE OPTION INSTALLATION AND 7 4 7 3 2 LOCAL PHONE OPTION OPERATION 2 nennen trennen eene 7 5 VA NMM I00 OPTION retten tte e ree iere eere ele UE 7 6 7 4 1 VMM 100 Hardwate rice tid tid iic n o ge e dee Um eret tances 7 6 7 4 2 RASJNLER
59. AS control line Voltage supervisor U45 ensures that the microprocessor turns off and on in an orderly manner when power is turned off and on or during power glitches RS 232 driver U37 interfaces the microprocessor with the serial communications port The IRQ interrupt request signal generated by portions of U47 and U48 informs the processor when the keypad is under use or a DTMF signal has been detected by the Audio Board Most of the rest of the circuitry comprises I O devices U43 and U44 create the chip selects required to control these devices U38 sends commands to the optional Voice Prompt Board JPS Communications Inc 4 24 m mu RTU 292 Operations Manual Bus drivers U60 and 061 are the input devices for the front panel switches latches 062 and U63 light the front panel LEDs Latches U50 through U53 send control signals mainly to the audio circuit sections 056 057 send inputs to the data bus 054 and 055 read Option switches SW1 SW2 Keypad decoder chip 059 provides the keyboard interrupt and translates keypad closures before sending them onto the data bus via latch U58 4 3 9 PROMPT TONE GENERATOR Timer U30 can create tones of 500 600 750 or 1kHz depending on the states of control signals from the CPU Board DTO and DTI The volume of these prompts may be adjusted via potentiometer R158 U33B U33C and U33D route either tone prompt or voice prompt signals to the circuitry controlled by the T V signal from th
60. AUD RATE Internal dipswitches SW1 1 and SW1 2 on the Main board configure the RS 232 baud rate of the unit s serial port as shown in the table below The factory setting is 9600 Baud Table 2 8 Baud Rate wi Off Off 2 8 11 RADIO CONTROL MODE Dipswitch SW1 3 enables the RTU 292 to be put into the Radio Control Mode via one of its DTMF commands In this mode the RTU 292 can be used to relay radio control commands via its RS 232 port to a companion Motorola URC 200 radio The factory default disables this mode with SW1 3 set to OFF See also Tables 3 1 and 3 3 Table 2 9 Radio Control Mode SWI 3 Radio Control Off Disabled 2 9 JPS Communications Inc RTU 292 Operations Manual m mu 2 8 12 PASSWORD PROTECTION Dipswitch SW1 5 enables or disables the RTU 292 s password protection feature Password protection prevents unauthorized access to the system from the PSTN line when the RTU 292 is in the Automated Operation Mode See section 3 7 for a full explanation of Automated Mode Operation and the use of the Password Protection Feature The factory setting is disabled SW1 5 Off To enable the password protection feature turn SW1 5 On The factory default password is 1 2 3 4 but may be changed to any number up to 10 digits long See Table 3 2 Table 2 10 Password Protection 2 8 13 VOICE PROMPTS Dipswitch SW1 6 enables or disables the use of Voice Prompts in the RTU 292 This feature should be enabled
61. CE J1 Male DB 9 Connector Input Impedance Balanced or Unbalanced 600 Ohm or Unbalanced 47K Ohm Input Level 40 to 10 dBm Internally Adjustable Output Impedance 600 Ohm balanced Output Level 40 to 10 dBm Internally Adjustable Frequency Response 300 to 3200 Hz 2 dB Key Relay Output Low Level Relay Contacts 60VA max Switching Speed 5 msec TELEPHONE Handset RJ12C Jack Dialing Modes Pulse Dial Make Break Ratio Dialing Keypad GENERAL Microphone Interface Headphone Interface Phones Jack monaural Speaker Driver Power VOX Hang Time Hybrid Balance Adaptation Speed into 600 Ohm Ultimate Hybrid Balance into 600 Ohm Hybrid Impedance Matching Capability Phone Line Connections Electret microphone dynamic receiver DTMF Pulse at 10 pps 40 60 3x4 Standard Telephone Layout ALC Automatic Level Control with 30 dB dynamic range Drives high medium or low impedance headphones Delivers NLT 10mW into 600 Ohm headphones 4W min 10 Distortion Internal Speaker 3 inch square 3 2 Ohms Indicators Peak Level Keyed and Indicator for each pushbutton Front Panel Controls Power Switch Dialing Keypad Speaker and Handset Volume Controls Pushbuttons Tel Line Phone Tel Line Radio Off Handset Phone Handset Radio Speaker Phone Speaker Radio Tel VOX Manual Key Auto Answer Audible Ring AC Input Power 115 or 230 VAC 15 47 63 Hz 20 VA typical 50 VA max DC Input Power 11 to 15VDC or 22 to
62. CE PROMPTS tnt prm ere RO R N C PEE OD 2 10 2 8 14 LOCAL PHONE LOCAL PHONE RING THROUGH eere 2 10 2 8 15 TRANSMIT LEVEL SET UP MODE reete eene tonno thin tnihi o tati teen toot enatis 2 11 2 9 16 MISCELLANEOUS JUMPERS etre eret rr e er e reet er edes 2 11 29 INTERCONNECT INFORMATION ern OH REL ER HR EUER 2 11 2 9 1 TELEPHONE CONNECTION fs 4 rete erre e ere dq eer t Re ds 2 12 2 9 2 RADIO CONNECTION teret ebd em qe m RT ORDRES 2 12 2 9 3 HANDSET CONNECTOR ere eere PRECOR RIT s 2 13 2 9 4 TERMINAL BEOGCK 3 5 0 rr RH e e De Dee TR PET ER costes 2 14 2 9 5 R5 232 CONNEGTION oerte eter E N a 2 15 210 AUDIO LEVEL SETUP AND 5 0 2 15 2 10 1 SETTING THE TRANSMIT 2 2 15 210 2 SETTING THE RECBEIVE EEVEL tetti tette eee reete eoe E hn or a E onis 2 16 2441 INSTALLATION CHECKLIST eio certet een ce Ree hee den eh eto 2 24 212 OPTIONS INSTALLATION AND 2 24 n Un 3 1 3 JPS Communications Inc RTU 292 Operations Manual 3 1 GENERAL 5 npe peat etn aee ite rr to iva ov e GN RD Ded are 3 1 32 FRONT PANEL CONTROLS INDICATORS AND CONNECTORS eee 3 1 3 2 1 MAIN POWER SWITCH os QAO
63. E 5 12 5 4 4 Dial Response 223 22 enean etd ERE T HR UR EHE Es 5 13 5 4 5 Disconnect Response ense REG e Ue e eee e 5 13 5 4 6 RESPONSE nier eret titre reete ree totes dre odeur det esae ert eren 5 13 5 4 7 Elapsed Time Response sonet ee RR Oe IG Ue RE E Ee ERE 5 14 5 4 8 Handset Phone Response inet e e e RUE e e ee EE end 5 14 5 4 9 Handset Radio Response esae de ei eite d e de d e Rad 5 14 54 10 Speaker Phone Response vz ic nones cete tete tese eie ie EE E e ee Ee pens 5 15 SATA Speaker Radio Respofise 2 erre teehee 5 15 5 412 INE TE Ue ak dacs 5 16 94213 Rhone Responses eI ORE GRE DUREE 5 16 5 414 Radio Respotise etre re REN PRESE GREEN E RE UNS 5 16 5 JPS Communications Inc RTU 292 Operations Manual mu SAIS Response ou eod t p RR kena d eie bte 5 17 54 16 Version Response oss RR Oe UR GER haan TX E re dg E e i o E des 5 17 5 5 CALL PROGRESS RESPONSES FROM THE RTU 292 cesses eene 5 18 5 6 RESPONSE ERROR CODES 4 redet tie ete ei e Pere ere de o repite re rre deno 5 18 6 MAINTENANCE AND ree incer epe eto eec apo onveersvnstdesensestetedeosccdhcensdessusentessouestedesbaccesscons dave 6 19 6 1 ISSUE 6 19 6 2 PREVENTIVE MAINTENANCE ge Rene ete Ye aree th e uen 6 19 6 3 REP
64. E RTU 292 FRONT PANEL KEYPAD When a Motorola URC 200 radio connected to the RTU 292 is programmed or controlled by the RTU 292 via front panel rather than a connected telephone or the Local Phone Option the following special instructions must be heeded When using the front panel for radio control the operator uses the handset and keypad To begin front panel control the user must enter three keypresses The RTU 292 will respond with an Acknowledge tone prompt and the voice prompt READY At this point all front panel keypad entries are treated just as though the user were sending commands via the telephone or local phone Front panel control operation will continue until one of the following conditions occurs e The user enters a sequence e There is neither PTT activity nor keypad activity for the duration of the activity timer 7 15 JPS Communications Inc RTU 292 Operations Manual m mu While the operator is using the keypad to control the RTU 292 the unit will not be available for e PSTN Auto Answering e Radio Squelch Break Access Operation e Radio DTMF Access Operation e Local Phone Control Table 7 9 DTMF Radio Control Commands These commands are intended to control a Motorola URC 200 radio associated with the RTU 292 The Radio Control Option must be enabled See Table 1 2 Scan mode 0 scan stop 1 scan start Pa Power level select 0 low 1 med 2 high With all of the above
65. EPHONE LINE INTERFACE 1 6 Telephone Line Switch Assembly 6 7 Telephone Receive Circuits sess TELEPHONE RING VOLUME Telephone Send Circuits sss Telephone Send Receive Levels 2 6 Tel Line Phone Command Tel Line Phone Response Tel Line Radio Command sess 5 9 Tel Line Radio Response TERMINAL BLOCK eee TERMINATING A CALL TEST EQUIPMENT 6 1 The Caller Dials The 292 3 11 The Caller Enters The Password if enabled 3 11 The RTU 292 Adapts The Phone Line 3 11 The RTU 292 Enters the COMMAND Mode 3 12 JPS Communications Inc TONE PROMPPTS sese eene nn 3 9 Tone Ringers iie epe 4 21 TRANSMIT LEVEL SET UP 2 11 Transmitter Audio Output esses 4 21 TRANSMITTER KEYING FULL DUPLEX SYSTEM 3 9 TRANSMITTER KEYING HALF DUPLEX SYSTEM3 Koc seats 10 UNPACKING iirinn en de tee URG 200 4 due ice noe oet rod sec ttd dea USING THE CALL LOGGING FEATURE USING THE HANDSET WITH THE RADIO Using the Speed Dial Version Response essere en 5 17 VMM 100 INSTALLA
66. INE RAD OFF CR Status returned showing that Tel Line Radio is disabled 5 9 JPS Communications Inc RTU 292 Operations Manual m mu 5 3 15 Time Command TIME lt hhmmss gt CR This command is used to check or set the time on the RTU 292 internal clock If no parameters are given the command simply returns the time date The parameter format is hour 00 23 minutes 00 59 seconds 00 59 The time is set and displayed in 24 hour format Note the Call Logging Feature must be enabled before use See 3 7 12 Expected Response Time Date Response Examples TIME CR Command requesting the current time and date from the RTU 292 01 MAR 98 11 05 20 EO CR Status returned indicating that the date is March jg 98 and the time is 11 05 20 seconds in the morning TIME 141830 CR Command to set the time to 2 18 and 30 seconds in the afternoon 05 DEC 97 14 18 30 EO CR Status returned indicating that the date is December 5 97 and the time is 2 18 and 30 seconds in the afternoon 5 3 16 Software Version Command VER CR This command is used to determine the version of the RTU 292 firmware The command requires no parameters Expected Response Version Response Example VER CR Command sent to the RTU 292 VER 2 00 CR Status returned from the RTU 292 This status indicates that the CPU software version is 2 00 JPS Communications Inc 5 10 m u RTU
67. ION er Ee ee ERE TEE PR S ERA EE ETE 2 10 et vetere rte FUTT ve ve 2 10 LOCALE PHONE ENABLE Urt EA Ee e Ee ERA VE UNE 2 11 LOCAL PHONE RINGTHROUGH erect e e Ee EET ve veo ee E EET 2 11 TX LEVEL SET UP MODE siis diceret tre tet eroe e VE ERES EO ve Ue cH NEP EE ER 2 11 JA ELEINE RIS TTG ce ette ette 2 12 PA RADIO DBZ9 MALE ete e eed re E EE ieee 2 13 JA HANDSET SIT26 JACK hee es eere te eee 2 13 TERMINAE 6 POSITION accetto e Ue e nee teet 2 14 P2 RS 232 CONNECTOR DB 9 MALE aiieieo ener enne 2 15 INSTALLATION CHECKLIST i Ee ee pere re o P e e e e 2 24 STANDARD OPERATIONAL COMMANDS 1 001 1811 3 14 PROGRAMMING MODE COMMANDS c cccccccessescesecssesecssceecscecaccssesecsecsecsaseesaseasesecsees 3 15 COMMAND SUMMARY rie P E E OPE HE Heres TU A Ee 5 2 RESPONSE SUMMARY o etre inp IR nr dr i ead e RR HEREIN 5 11 CALL PROGRESS RESPONSES sni eei eed e DB e e RHET 5 18 RESPONSE ERROR CODES n Te 5 18 FAULT ANALY SIS tcc 6 2
68. Installation and Operation Manual RTU 292 RADIO TELEPHONE INTERFACE UNIT Designed and Manufactured by JPS Communications Inc 5800 Departure Drive Raleigh NC 27616 e mail jps jps com JPS P N 5970 600200 Revision 1 62 July 2005 1 JPS Communications Inc RTU 292 Operations Manual m mu Warranty JPS Communications Inc warrants its manufactured equipment to be free from defects in materials and workmanship and to conform to published specifications for a period of 18 months from the date of shipment from the factory or 12 months from installation whichever occurs first JPS warrants its service work performed in connection with this warranty to be free from defects in materials and workmanship for a period of 90 days from the date the work is performed If a defect occurs within the warranty period the buyer shall notify JPS immediately JPS will repair or replace the equipment at its option upon return of the equipment shipping prepaid to the JPS facility in Raleigh North Carolina USA This warranty does not apply to damage caused by accidents abuse or improper installation NO OTHER WARRANTY EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE SHALL APPLY NOTICE JPS Communications Inc reserves the right to make changes to the equipment and specifications without prior notice PROPRIETARY STATEMENT The informa
69. JACK eese 3 1 HYBRID BALANCE MEASUREMENT 6 2 Hybrid Balance Test Set Up 6 3 ime Date Response JPS Communications Inc NACTIVITY DISCONNECT TIMER 3 16 nitial Adaptation nitiate Call Via Attention Signal 7 11 7 13 2 2 NPUT POWER SELECTION NSPECTION nstall tion iiia here rci INSTALLATION AND CONFIGURATION 7 2 INSTALLATION CHECKLIST 2 24 INSTALLATION CONSIDERATIONS 2 2 INSTALLATION 2 2 INTERCONNECT INFORMATION INTERFACE CIRCUITRY Interface Details Internal Option Setting Details Internal Option Settings ees e m J2 LOCAL PHONE CONNECTOR 3 4 JUMPERS 2 11 Dco M 9 KEY PUSHBUTTON esee 3 3 Keying Circuits KEYPAD hacerte tenter ihe S 10 Local Phone Commands 7 5 Local Phone LOCAL PHONE OPTION T Local Phone Option 7 5 LOCAL PHONE OPTION INSTALLATION AND CONFIGURATION e
70. LUSDUL CM Em 7 7 7 4 3 VMM 100 INSTALLATION AND 2 02222 2 00000 0000000000000000000005004 7 7 75 DIMP ACCESS OPTION teret saben vers cues celica ae aeree eese e den 7 11 7 5 1 Initiate Call Via Attention Signal cian ea eR eA RH A ew 7 11 7 5 2 RTU 292 Response to Attention Signal sss eee 7 11 7 5 3 Radio Caller Provides Calling Directions sss 7 11 7 5 4 RTU 292 Plays Back Phone Number amp Prompts for Confirmation sss 7 11 7 5 5 RTU 292 Plac s the Call x ctt hha BAA Ae A eee oe Aes 7 11 7 5 6 After the Call Begins sec 5 as ee ar ted a ee LS BE A iie 7 12 7 6 SQUELECH BREAK ACCESS OPTION tre Ri eH epe eee eene 7 13 7 6 1 Call Via Attention Signal Ree ane alte de 7 13 7 6 2 RTU 292 Response to Attention Signal esses ener nenne 7 13 7 6 3 RTU 292 Prompts for Confirmation cccecccesecsseeseeeseeeseeseeeecesecnsecseceaeceaeceaecseeeseeeaeeneeseseeereess 7 13 7 6 4 RTU 292 Pl ces the Call s 63 eet ie re ine eee 7 13 7 6 5 After the Call Begins esee EET A eer t e ie ne 7 13 TT THE CALL LOGGING OPTION iet e er e a iota ete er e Pet e 7 14 7 7 1 Checking The Time And Date ai see an eet ae PUR TET ed aie tin Baha wae 7 14 7 7 2 Setting The Tite pen eere eR RERO e EE Ge RO E e ER e
71. Logic U3 U8 is a reset generator that insures an orderly power up sequence for the DSP and associated components It senses the voltage on the 5V line and generates a reset while the voltage is below approximately 4 55V As the voltage rises above the threshold a delay is generated by C8 to insure processor clock stability before operation commences Resistor R2 prevents U8 from resetting on short spikes on the 5V line Latch U4 provides an eight bit parallel output from the DSP Two of the outputs are used NR3 and NR4 while the other six are spare Latch U12 provides an eight bit parallel input to the DSP Two of the inputs are used NR1 and NR2 while the other six are spare Latch U11 provides a means for the DSP to read SW1 switch settings 7 4 1 2 VMM 100 Analog Interface Chip U2 provides the analog interface to the DSP section This chip is type TLC32040 and contains an A D converter for the analog input D A converter for analog output and an anti alias filter before the A D and a reconstruction filter after the D A The chip derives its own timing for these functions from the master clock provided by the DSP These chips are interfaced to the DSP via a serial bus Amplifier U13 is a dual op amp that provides gain of one buffer amplifiers for the analog audio input and output JPS Communications Inc 7 6 m mu RTU 292 Operations Manual 7 4 2 VMM 100 Software The VMM 100 DSP software can provide voice modulation recogniti
72. NSMIT LEVEL 2 15 SETUP PARAMETERS Shipping Address sse Simplex oie ore Ced o d p RED Speaker and Headphone Circuits 4 22 SPEAKER BUTTONS heme 3 3 Speaker Phone 2 5 7 JPS Communications Inc RTU 292 Operations Manual Speaker Phone Speaker Radio Command Speaker Radio Speaker Switch Assembly sese SPEAKER TO MONITOR AUDIO s SPEAKER VOLUME SPEECH PROCESSOR Speed Dial Command Speed Dial Directory Speed Dial Feature SPEED DIAL FEATURE SPEED DIAL RESET Speed Dial Response Squelch 5 eornm e ED SQUELCH BREAK ACCESS FEATURE Standard DTMF Operational Commands 3 14 STANDARD OPTIONS sese 1 5 STATUS RETURNED FROM THE RTU 292 5 11 Table of Contents pain reisien sirigis 3 TEL LINE BUTTONS 3 2 TEL VOX 3 3 TELEPHONE ettet tetra 1 6 TELEPHONE CALL ON 3 6 TELEPHONE 2 12 Telephone Interface ete eene 1 2 TELEPHONE INTERFACE CIRCUITS 4 20 TEL
73. OX SENSITIVITY TEST SET UP o cccccccccsssscccceceesesseaececececseseaececececsesssaeceeececsenssseeeesesenennsaeeeeees 6 23 FIGURE 7 1 VOICE PROMPT OPTION INSTALLATION 2 2 222 2 1 26000000000000000000000000000000 7 3 FIGURE 7 2 LOCAL PHONE OPTION 8 2 000 0 0000010000000000000000000000000 7 5 FIGURE 7 3 VMM 100 OPTION INSTALLATION ccseccsccccceesessssececececsesseaeceeececsesseaececececeessaeeeeeeeeseneaseeeeeeeeene 7 8 FIGURE 8 1 FRONT PANEL SCHEMATIC ccssssccccecsesesscececcceesesssaececccecsesaaececececsessaaeceeececsessaaeceeceseseneaaeceeeceesenea 8 1 FIGURE 8 2 MAIN BOARD SCHEMATIC 8 1 EIGURES 23 DSP MODULE R cert etie Ut erbe vq 8 1 FIGURE 8 4 OPTION INTERFACE BOARD ccccccccccscssssssecececeesenscaecececeeseseaececececsessaaeceeececeesaaeceeeeecsessaaeceeeeeesenea 8 1 FIGURE 8 5 VOICE PROMPT OPTION BOARD sccsccccececsssssseceeccecsesssuscecececeessseceeececsensaseseeececeeseusaeseeecsesensaaeeeeees 8 1 FIGURE 8 6 LOCAL PHONE OPTION BOARD e cccecccccsessssececececeeecsececececsessauececececsessaaeeecececeesesaseeecesceeneeseeeeeeeenes 8 1 FIGURE8 7 100 OPTION BOARD cccccessssecececessssseceeececeensauscecececeessaueceeececsesaueceeececseseasaeeeeeceesenseaeeeeecs 8 1 7 JPS Communications Inc
74. Off Off SWI 7 8 FUNCTIONS SWI1 8 On On Off Off 7 10 VMM 100 Switch Functions Threshold 1 lowest 2 Factory Default 4 highest Hangtime 0 75 seconds 1 25 Factory Default 1 75 2 25 0 msec 100 Factory Default 200 300 m mu RTU 292 Operations Manual 7 5 DTMF ACCESS OPTION This option allows a radio user to use his DTMF keypad to quickly place a telephone call via the RTU 292 If the user does not have DTMF capability the Squelch Break Access Option allows the use a series of squelch breaks to automatically connect to the telephone at speed dial location 01 see next section In the following description system voice prompts are listed If the Voice Prompt Option is not installed only the tone prompts will be heard NOTE It is possible to enable this option remotely If you have purchased an RTU 292 without this option and want to add it contact JPS 7 5 1 Initiate Call Via Attention Signal The radio user sends the Attention signal to the RTU 292 The attention signal consists of the characters three stars 7 5 2 RTU 292 Response to Attention Signal The RTU 292 will respond with the voice prompt RTU 292 automatic phone patch Enter phone number followed by the pound sign or stand by for auto call The RTU 292 will also give the Acknowledge ACK tones If Password Protection is enabled the RTU 292 will request the correct password prior to asking for the teleph
75. RADIO allow the handset to be connected to the internal telephone the radio or both simultaneously Each button has an associated LED that is illuminated when the path is active Pushing the HANDSET PHONE button connects the handset to the telephone audio path ad activates the handset microphone Note that this will not take the telephone off hook the TEL LINE PHONE LED must also be on for the handset to be used to communicate over the telephone line Pushing the HANDSET RADIO button selects the handset to the radio audio path When this path is selected HANDSET RADIO LED is on the handset PTT switch will key the radio transmitter If both paths are simultaneously selected the audio heard in the earpiece will be the radio receive and telephone audio mixed together and microphone input will be sent both to the telephone line and to the radio transmitter JPS Communications Inc 3 2 m mu RTU 292 Operations Manual 3 2 11 SPEAKER BUTTONS These two buttons SPEAKER PHONE and SPEAKER RADIO determine whether the speaker monitors telephone receive audio radio receive audio or both Note that if a radio to telephone call is underway and both buttons are pressed the full conversation is being monitored There is an LED alongside each button that is illuminated when the associated path is selected 3 2 12 TEL VOX This button enables keying of the radio transmitter by the RTU 292 VOX Voice Operated Xmit facility When the VOX is selec
76. RADIO button is engaged To adapt it measures the characteristics of the line by placing a white noise source built into the unit on the line for a short time While the noise burst is connected the amount of signal reflected from the phone line is measured and adaptation begins The adaptation algorithm adjusts the adaptive hybrid to minimize the reflected signal throughout the audio frequency spectrum from the phone line During the adaptation process the TEL LINE RADIO LED will flash When adaptation is complete the JPS Communications Inc 3 6 m u RTU 292 Operations Manual noise source is switched off the LED is lit continuously and the unit is ready for operation This adaptation procedure normally takes less than one second For adaptation to be successful the far end of the phone line must be quiet there must be no signal coming into the RTU 292 from the phone line during adaptation If there is incoming audio the unit may not be able to adapt but will keep trying for up to ten seconds For example the telephone user at the far end of the phone line should not talk during the adaptation cycle If the TEL LINE RADIO LED does not stop flashing within the normal second or two after the TEL LINE RADIO button is pushed wait a short time longer If the LED still continues to flash chances are that there is excessive noise on the phone line and it is best to hang up and redial Because the adaptation algorithm is very
77. STALLATION CONSIDERATIONS etta tae t rx HO E PERO P reb ede vin 2 2 2 5 1 ECC PART 08 REGULATIONS ere th eee ge tes e et rede tt 2 2 2 07 JIPOWER REQUIREMIENC S Ene EYED re Eque 2 4 24 INPUT POWER SELECTION entier ett tree tre e RD he er ei mte 2 4 2 7 1 EINE VOLTAGE SELECTION oct iiit t tpe ret to ere eR e REN Mee e reo 2 4 2472 DCINPUT POWER SELECTION reete Ur ee 2 4 2 5 CONFIGURING THE RTU 292 etenim ete le reti eR Np rope its 2 5 2 8 1 PROGRAMMING MODE SETUP PARAMETERS 2 eene eee nennen 2 5 2 8 2 SETTING TELEPHONE SEND AND RECEIVE LEVELS eee 2 5 2 8 3 VOX HANGTIME niti eerie te Rd t o deo n dee epa ett e 2 7 2 8 4 VOX SENSITIVE s etri e tie tee tdeo toe i 2 7 2 8 5 BALANCED UNBALANCED RADIO INTERFACE eene 2 7 2 8 6 RX LINE INPUT IMPEDANCE 4 ette oet ime eee teet eoe e eS eet e eie e 2 8 2 8 7 DIAL itr rer ttr ESO e RR DEI Dn DUI desees 2 8 2 8 8 TELEPHONE RING VOLUME e e rete dere eo 2 8 2 8 9 FULL HALE DUPLEX RADIO epe p Rp SURE 2 8 2 9 10 SERIAL PORT BAUD RATE iere ner TNT eredi 2 9 2 95 11 RADIO CONTROL rri t terr eH aes T re eer Op e ee ete er e ir tis 2 9 2 9 12 PASSWORD PROTECTION m ctr te ree o eT e eS 2 10 28 13 VOI
78. Status indicating that the Tel Line Phone path is enabled LINE PH OFF lt gt Status returned indicating that the Tel Line Phone path is disabled 5 4 14 Tel Line Radio Response JeTEL LINE RAD lt gt Exx CR Type Synchronous Response To Tel Line Radio Command This response indicates the Tel Line Radio path status Examples LINE RAD ON EO CR Status indicating that the Tel Line Radio path is enabled LINE RAD OFF CR Status returned indicating that the Tel Line Radio path is disabled JPS Communications Inc 5 16 m mu RTU 292 Operations Manual 5 4 15 Time Date Response hh mm ss CR Type Synchronous Response To TIME or DATE Command This response indicates the current Time and Date for the RTU 292 internal clock Note the Call Logging Feature must be enabled before use See 3 7 12 Examples 01 MAR 98 11 05 20 lt CR gt Status returned indicating that the date is March 14 98 and the time is 11 05 and 20 seconds in the morning 05 DEC 97 14 18 30 lt CR gt Status returned indicating that the date is December 5th 97 and the time is 2 18 and 30 seconds in the afternoon The strings representing the month are JAN FEB MAR APR MAY JUN JLY AUG SEP OCT NOV DEC 5 4 16 Version Response a bb Exx CR Type Synchronous Response To Version Command This response gives the RTU 292 firmware v
79. TION AND CONFIGURATION7 7 VMM 100 OPTION 7 6 VMR inm ouo t mites nite es 10 7 6 Voice Modulation Recognition esses 7 6 VOICE PROMPT OPTION 2 Voice Prompt Option 7 3 VOICE PROMPT SOFTWARE 4 26 Voice Prompts Enable 7 2 VOK ae 10 4 23 VOX HANGTIME 2 7 VOX SENSDEEVITY r 2 7 VOX SENSITIVITY 6 5 VOX Sensitivity Test 2 002021 6 5 VOX Test Procedure sss 6 5 Waiting For Input QUERY see 3 10
80. Telephone set for use with the Local Phone Option Voice Prompt Option 5930 595000 Standard Version English female voice VMM 100 Option 5930 591100 Provides DSP Voice Modulation Recognition squelch and or DSP Noise Reduction to the radio RX input STU III Option 5960 796000 Allows connection to a STU III phone Rack Slides Kit 5930 594000 1 set slides and hardware to rack mount one RTU 292 Software Options Call Logging S W Option Provides record of calls via RS 232 interface Radio Control Option Provides remote control of URC 200 radio via RS 232 int Squelch Break Access Allows radio connection via series of squelch breaks DTMF Access Option Allows radio connection via DTMF keypad 1 5 JPS Communications Inc RTU 292 Operations Manual m mu Table 1 3 RTU 292 SPECIFICATIONS TELEPHONE LINE INTERFACE J2 Male DB 9 Connector Output amp Input Levels to Phone Line Nominally 12 dBm Adjustable 21 to 0 dBm in 3 dB steps Frequency Response 2 dB 300 to 3200 Hz Output Impedance to Phone Line 600 Ohm VOX Sensitivity 16 2 dB Below Phone Line Input Level Setting 25 dBm 9 dBm Level Setting for example 0 6 Second or 2 0 Seconds Internally Settable 30 dB over 300 to 3200 Hz BW within 1 25 Sec measured with white noise source 50 dB typical over 300 to 3200 Hz BW measured with a single tone 0 to 10k Ohm Complex Impedance RJ11C Connector J1 and screw terminals on rear panel term block RADIO INTERFA
81. WER SELECTION 2 7 1 LINE VOLTAGE SELECTION CAUTION To prevent damage to the unit check the power line voltage selection before applying power Also be certain that the unit is connected to a grounded outlet As shipped from the factory the RTU 292 is normally set for the correct line voltage in the area where it will be installed but the voltage selection should be checked before initial operation The number visible through the window in the line power module located on the rear panel indicates the nominal line voltage range in the following manner 100 or 120 position nominal 115V operation 220 or 240 position nominal 230V operation The number will be easier to see if the clear fuse cover is slid to the left with the line cord removed To change the voltage selection remove the line power cord and slide the clear plastic fuse cover to the left exposing the fuse Pull the small handle marked Fuse Pull rotate the handle to the left and remove the fuse With the Fuse Pull handle to the left pull the voltage selector card from its slot and replace it with the desired operating voltage appearing at the top left side Rotate the Fuse Pull handle back to the right and snap the fuse back into the metal clips The fuse should be either 115V operation 1 A time delay fuse 230V operation 1 2 A time delay fuse To replace a blown fuse follow the same general procedure except that the voltage selector card need not b
82. al 5 3 13 Tel Line Phone Command TEL LINE PH lt 2 gt CR This command is to enable disable or query the current status of Tel Line Phone Note that enabling Tel Line Phone will put the PSTN in an Off Hook status Disabling Tel Line Phone will only put the PSTN back on hook if Tel Line Radio is also disabled To quickly disconnect the PSTN use the DISC command Expected Response Tel Line Phone Response Examples TEL LINE PH ON CR Command to enable the Tel Line Phone path 9eTEL LINE PH ON CR Status returned showing that Tel Line Phone is enabled TEL LINE PH CR Command requesting the status Tel Line Phone LINE PH OFF CR Status returned showing that Tel Line Phone is disabled 5 3 14 Tel Line Radio Command TEL LINE RAD ONJOFF CR This command is to enable disable or query the current status of Tel Line Radio Note that enabling Tel Line Radio will put the PSTN in an Off Hook status and cause the DSP telephone hybrid to adapt Disabling Tel Line Radio will only put the PSTN back on hook if Tel Line Phone is also disabled To quickly disconnect the PSTN use the DISC command Expected Response Tel Line Radio Response Examples TEL LINE RAD ON CR Command to enable the Tel Line Radio path LINE RAD ON CR Status returned showing that Tel Line Radio is enabled TEL LINE RAD CR Command requesting the status Tel Line Radio 9eTEL L
83. arious I O connectors and the DC power input connector are accessible via the rear panel 1 3 1 MAIN BOARD The main board has six general sections of circuitry the Telephone Interface section Handset Speaker Interface section Radio Interface section DSP section CPU section and Power Supply section These are described briefly in the following paragraphs Refer to the RTU 292 block diagram along with the text The power supply and DSP sections are not shown in the block diagram refer to Section 4 for more details 1 3 1 1 Telephone Interface The Telephone Interface Section has the amplifiers that drive and receive audio from the phone line This section also contains the DSP hybrid which is detailed in Section 4 of this manual interfaced with the keypad A tone ringer generates a warble audio tone when ring voltage is received JPS Communications Inc 1 2 m mu RTU 292 Operations Manual 1 3 1 2 Handset Speaker Interface The Handset Speaker Interface Section contains the speaker pre amp and driver the headphone pre amp and driver Audio gates controlled by the front panel switches route the audio to the speaker and handset microphone preamplifier and ALC Automatic Level Control circuit 1 3 1 3 Radio Interface The Radio Interface Section consists of operational amplifier circuits that handle the audio interfaces between the RTU 292 and the radio The amplifiers provide gain adjustability to accommodate various input and o
84. de unless the password is correctly entered See Table 3 2 JPS Communications Inc 3 14 m mu RTU 292 Operations Manual Table 3 2 Programming Mode DTMF Commands These commands may be entered by the RTU 292 front panel keypad or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option The unit must be put into the programming mode by entering 99 before these commands can be executed See 3 7 6 for special instructions regarding the use of the RTU 292 keypad DTMF Command Call Logging Enable Disable 0 0 Disables Call Logging factory default is disabled 0 1 Enables Call Logging See 3 7 13 1 Change the password to xxx Terminate entry with Password may be up to 10 digits long Factory default is 1 2 3 4 5 Program the inactivity disconnect timer based on value of x See 3 7 8 for more information Program the Calling Timer based on the value of x The RTU 292 will attempt to place a call to a telephone until this timer expires See 3 7 8 for more complete information 30 Seconds factory default Program Speed Dial Entry See 3 7 10 Review Speed Dial Entry xx E NO 3 15 JPS Communications Inc RTU 292 Operations Manual m mu 3 7 7 RTU 292 PASSWORD PROTECTION The password protection feature is enabled by a dipswitch setting SW1 5 see Table 2 1 When passwords are enabled access to
85. desired 2 51 PART 68 REGULATIONS The RTU 292 has been designed to comply with FCC Part 68 regulations regarding equipment connected to telephone lines but is not officially certified If tested compliance to FCC Part 68 is required external equipment can be installed between the RTU 292 and the telephone line to provide compliance JPS Communications Inc 2 2 m mu RTU 292 Operations Manual Table 2 1 RTU 292 Factory Default Settings This table describes the settings of all RTU 292 internal adjustments and switch positions as set when the unit is shipped Telephone Send and Receive Levels SW2 1 2 3 Dial Mode SW1 4 DTMF VOX Sensitivity SW2 4 5 Medium Internal Audio Potentiometers SWIT DC Input Power Selection Internal Switch S6 24 28 VDC nominal 12 or 24 28 VDC 22 to 30 VDC 2 3 JPS Communications Inc RTU 292 Operations Manual m mu 2 6 POWER REQUIREMENTS The RTU 292 is designed to operate from 115V or 230V 47 to 63 Hz single phase AC power source The unit will meet all of its specifications over a voltage range of 15 from nominal Power consumption is 20 VA typical 50 VA maximum Alternatively the unit may be operated from a nominal 12 24 or 28 VDC supply At the 12VDC setting the unit will operate from 11 to 15VDC and at the 424 728 VDC setting the unit will operate from 22 to 30 VDC Slide switch S6 on the Main Board selects either 12 or 424 428 VDC 2 7 INPUT PO
86. dio Is Unkeyed UNKEYED 3 10 RADIO TO THE TELEPHONE 3 6 REAR PANEL CONNECTORS RECEIVE LEVELS 2 16 Receiver Input Amplifier sse 4 21 RECEIVING A TELEPHONE CALL 3 6 Recommended Phone Line Settings 2 6 REMOTE CONTROL 5 1 Remote Control 5 1 REMOTE KEY orb eo eere EROR 3 9 REPAIR OR REPLACEMENT 6 1 Replaceable Parts List sese 6 7 RESHIPMEN T 2 1 Response Error Codes 5 18 RESPONSE ERROR CODES 5 18 Response Response to Attention Signal Ring Detector and Tone Ringer RS 232 CONNECTION iere eene tte RS 232 REMOTE CONTROL OVERVIEW RTU 292 Options RTU 292 PASSWORD PROTECTION RTU 292 Places the Call D RTU 292 SCHEMATIC DIAGRAMS SELF TEST nre Send Receive SERIAL PORT BAUD RATE 2 9 SETTING TELEPHONE SEND AND RECEIVE DEVBES inet nee rne Setting The SETTING THE RECEIVE LEVEL Setting The Times nce eee en Bots SETTING THE TRA
87. e CPU 4 4 OPTION INTERFACE BOARD This board contains the basic databus power audio and control lines to operate the various options that may be installed on the unit on the options tray See figure 8 4 4 5 VOICE PROMPT OPTION The Voice Prompt Option outputs prerecorded voice prompts into the telephone send signal or into the radio transmit audio output from the RTU 292 See figure 8 5 4 5 1 SPEECH PROCESSOR The heart of the voice prompt option board is the speech processor chip U7 This chip is an ADPCM Adaptive Pulse Code Modulation processor containing built in A D and D A and can be used for recording as well as playback The digitized voice prompts are contained in EPROM US which U7 accesses via data bus AD The prompt analog audio is output on U7 28 and is passed through amplifiers U9 and U10 These amplifiers are arranged as a five pole active low pass filter which removes remnants of the 8 kHz sampling frequency from the output audio 4 5 0 CONTROL PROCESSOR The control microprocessor is 68HC11A0 an 8 bit processor running at 8 MHz with a basic instruction cycle time of 2 microseconds There is some I O from the processor chip itself from Port D pins 20 to 25 and Port A pins 27 to 34 which controls the Audio Processor chip The control input to the board is to Port E Pins 43 to 50 from connector J1 The lower eight bits of the address bus are separated from the data bus by address latch U2 EPROM UA is the pr
88. e assemblies contains a different complement of components as required by its function Signals from the switches are read by the CPU circuitry on the main board The processor then routes audio signals and lights the front panel LEDs according to the pushbutton commands 1 3 3 OPTIONS INTERFACE BOARD This board located on the Options Tray above the main board contains the connectors used to interface the main board to the various option boards that may be assembled to the Options Tray 1 3 JPS Communications Inc RTU 292 Operations Manual Table 1 1 Equipment and Accessories Supplied Part Number Item 5970 600000 RTU 292 Standard 5970 600200 Operation amp Maintenance Manual 5970 600150 Accessory Kit 1 1 1 Accessory Kit Consists of Oty 5 Part Number Item 0150 200000 Handset PTT black Cable misc power w 3 wire connector Cord coiled black for handset Connector cable DB 9 receptacle Fuse 3AG 1 2A slow blow Fuse 3AG 1A slow blow HW clamp cable for DB 9 connector 0827 102401 HW Telephone Hanger may be attached to front panel holes provided 0833 063205 HW screw flat head 6 32 x 5 16 100 degrees spares for top cover mounting 0837 103200 HW screw truss head 10 32x3 8 for mounting unit front panel to rack includes one spare 5 0848 100001 HW washer flat nylon 10 by gt diameter by 1 16 thick for mounting unit front panel to rack includes one spare 00
89. e microphone preamplifier its output U13A 1 drives the ALC circuit composed of U14A and U13B The ALC holds the output level at U13B 7 to about 9dBm over a 30 dB input range Amplifier U15B boosts the mic signal level to about OdBm to drive the MIC bus Resistor R64 feeds some of the mic signal into the handset earpiece as sidetone so the earpiece doesn t sound dead 4 3 4 2 Speaker and Headphone Circuits The signals that drive the speaker are selected by analog gates U18A U18B and U18C and are mixed in amplifier U16A The output on U16A 1 is fed to the top end of the speaker volume potentiometer on the front panel The wiper of the volume pot is fed to the speaker driver U17 through R89 The ring signal from the tone ringer is mixed via R88 so that it bypasses the volume pot Its amplitude is set separately by R156 Headphones and handset signals are selected by analog gates U19A U19B and U19C and mixed in amplifier U16B Output U16B 7 is applied to the top end of the headphones volume pot on the front panel The signal from the pot wiper is fed to amplifier U15A through R65 The output of U15A drives the handset earpiece through R67 and the headphone jack through R68 4 3 5 DSP MODULE The DSP hardware circuitry is detailed in Figure 8 3 The general purpose of the DSP hardware is to convert analog signals to the digital domain operate on and manipulate these signals digitally using the DSP chip then convert the result back to anal
90. e of audio except telephone ringer volume at the front panel speaker Rotate clockwise to raise audio from minimum to full Telephone ringer volume is controlled independently by an internal adjustment R156 see section 2 8 3 2 8 PHONES VOLUME CONTROL This potentiometer controls the signal level present at the front panel headphone jack and in the handset earpiece Rotate clockwise to increase the audio level 3 2 5 TEL LINE BUTTONS These three buttons PHONE RADIO and OFF determine whether the internal telephone the radio both or neither OFF are connected to the telephone line Pushing the TEL LINE PHONE button connects the RTU 292 internal telephone to the telephone line and allows dialing using the keypad Pushing this button will also answer an incoming telephone call The associated LED will be illuminated while the telephone line to internal phone path is selected Pushing the TEL LINE RADIO button connects the telephone line to the radio through the DSP adaptive hybrid The unit then starts its adaptation cycle by putting a burst of white noise onto the telephone line When the adaptation cycle is underway the TEL LINE RADIO LED will flash After successful completion of the adaptation cycle this LED will be on continuously indicating that the unit is ready for operation The TEL LINE OFF pushbutton will hang up any active TEL LINE RADIO or TEL LINE PHONE connection 3 2 10 HANDSET BUTTONS These two buttons PHONE and
91. e removed 2 7 DC INPUT POWER SELECTION Internal slide switch S6 is used to configure the RTU 292 to accept DC power from a nominal 12 or 24 28 VDC source The 12 28 VDC position will work with 24 VDC nominal JPS Communications Inc 2 4 m mu RTU 292 Operations Manual and 28 VDC nominal supplies The unit will automatically switch over to the use of the DC input when the AC source drops too low or is not available Slide switch S6 on the Main Board is used to select either 12 or 24 28 VDC operation 81 is located near the left front edge of the Main Board the 12V and 24 28V switch positions are clearly marked on the board The RTU 292 is set in the factory to the 24 28 VDC position 2 8 CONFIGURING THE RTU 292 The RTU 292 factory default settings are listed in Table 2 1 The factory set up will be correct for most installations explanations of each feature selection method or other adjustment are provided for systems requiring different set ups If any setting must be changed refer to Figure 2 3 Internal Adjustments Locations Remove the top cover of the unit by removing the Phillips head screws around its edges NOTE Many of the RTU 292 s operating parameters are set by internal eight position dipswitches SW1 and SW2 These switches are read by the RTU 292 microprocessor only when the unit power is turned on To change any dipswitch controlled parameter turn off the RTU 292 change the switch setting s
92. e send line This line from the audio board may be the audio from the telephone lines prompt tones receiver audio sidetone audio or DTMF tones depending on the state of control gates on the audio board The gain is set to produce an approx 9 dBm level at U3A 1 U3B is configured as a conventional active hybrid The local phone send signal is sent to U3B via R8 and R35 The combination send plus receive signal reaches U3B via R7 The send signal is subtracted from the send plus receive signal leaving only the receive signal at the output of U3B 4 6 2 DIAL BUSY GENERATORS Dial Busy signals are composed of two tones so a pair of frequency sources U5 and U6 are required Each of these 555 timer ICs provides a square wave output R30 and C10 set the frequency of U5 to 460 Hz The frequency of U6 is 620 Hz when 02 is off set by R24 and C11 When commanded by the CPU Board Q2 turns on placing C12 in parallel with C11 This cuts the frequency of U6 to 350 Hz The CPU Board normally holds the timers off but when a high signal is sent on the DTONE line U5 and U6 turn on Their square wave outputs are smoothed by the RC filter networks made up of R31 R34 and C18 and R32 R33 and C17 4 6 5 LOCAL TELEPHONE LINE INTERFACE Tip and Ring signals are brought to the board on 11 Varistor RV1 limits transients that may appear on the local phone line The silent ring trip circuit will sense a voltage drop across R22 if the local phone is taken of
93. eak timing The RTU 292 will respond to either a positive going or negative going squelch signal NOTE It is possible to enable this option remotely If you have purchased an RTU 292 without this option and want to add it contact JPS 7 6 1 Initiate Call Via Attention Signal The radio user sends the Attention signal to the RTU 292 This is a series of 3 squelch breaks that occur within 4 seconds window 7 6 2 RTU 292 Response to Attention Signal The RTU 292 will respond with the voice prompt RTU 292 automatic phone patch The Acknowledge ACK Tone prompt is also given 7 6 3 RTU 292 Prompts for Confirmation The RTU 292 then requests confirmation with the prompt Please confirm with a single squelch break The caller confirms his desire to call by giving 1 additional short squelch break within 5 seconds If the RTU 292 does not receive confirmation within that time 1t will give a Timeout tone prompt terminate the attempt to call and go back to its waiting state 7 6 4 RTU 292 Places the Call The RTU 292 then informs the radio user that the call is being placed The ringback information that is provided when placing a call via the RTU 292 front panel keypad or Local Phone is not sent over the air due to FCC regulations The RTU 292 adapts to the phone line while placing the call If the number is busy the busy tones will be broadcast for approximately 5 seconds before the RTU 292 terminates the call attempt O
94. ed Either method will set the correct transmit level in the majority of cases The radio may also have a TX audio level setting procedure in its installation manual If so use the radio s procedure in conjunction with the directions below 2 10 1 1 A Set Up Mode Enter the Set Up Mode by turning off the unit setting dipswitch SW2 7 to ON Turn unit power back on In this mode the RTU 292 DSP module generates a test tone at the same amplitude as voice peaks received on a telephone line and applies this tone to the RTU 292 transmitter output While in the Set Up Mode key the transmitter by pushing the KEY pushbutton or by other means If using B Telephone Line Method simply press the TEL LINE RADIO button and speak into the phone 2 15 JPS Communications Inc RTU 292 Operations Manual m u 2 10 1 2 Adjust TX Level Adjust so that the transmitter is just fully modulated If the transmitter is AM or SSB use its output power meter if available to determine the amount of modulation Do this by advancing R133 clockwise just until the power meter stops rising This will produce maximum modulation without activating the radio s compressor When using an FM transmitter a deviation meter may be necessary to determine the amount of modulation NOTE The RF Power meters on most SSB transmitters do not respond accurately to voice peaks so a low RF meter indication on actual voice from the RTU 292 may make the transmitter appear to be u
95. ephone set the operator now places a call to the distant telephone Or 3 4 8 2 The operator begins the procedure by using the RTU 292 s internal telephone set to place a call to the distant telephone party Alternatively The operator may have received a call from a distant telephone party wishing to make a phone patch He then places the telephone party on hold while the distant radio party is contacted The operator then establishes a link between the local radio set and the distant radio set using the RTU 292 s handset with the radio as described in paragraph 3 4 6 3 7 JPS Communications Inc RTU 292 Operations Manual m u 3 4 8 3 Once the telephone and radio party have both been contacted the operator should advise the telephone party that a phone patch is being set up He may want to advise that a short noise burst not extremely loud will be heard in the telephone receiver and that the conversation can proceed following the burst The operator then pushes the TEL LINE RADIO button to begin adaptation indicated by a flashing TEL LINE RADIO LED 3 4 8 4 After the RTU 292 automatically adapts itself to the phone line and the TEL LINE RADIO LED will stop flashing and stay continuously illuminated This indicates that a complete link has been established between the distant radio set and the distant telephone via the RTU 292 and the local radio set 3 4 8 5 Progress of the call may be monitored via the speaker on t
96. eration when balance has been achieved 4 3 6 2 Noise Generator A pseudo random noise generator is implemented to speed hybrid adaptation During the adaptation cycle the input receiver audio is switched off by gate U8C and the noise generator switched on at gate USA The wide bandwidth of the noise assures that the hybrid is adapted over the full audio bandwidth 4 3 6 3 Peak Detector A peak detector monitors the receive audio bus and signals at A D 2 to flash the PEAK LED on audio peaks which exceed 0 dBm This function aids in setting up the RTU 292 with the proper audio levels 4 3 64 VOX A VOX Voice Operated Xmit function looks at the output of the adaptive hybrid and triggers if the audio exceeds a preset level Once triggered it stays active for a short time to prevent VOX drop out on pauses between syllables This is called Hang Time and is adjustable via Option Switch SW2 6 The VOX sensitivity is adjustable via Option Switches SW2 4 and SW2 5 4 3 6 5 Audio Delay The output of the adaptive hybrid is delayed before being output to the transmitter output amplifier The purpose of the delay is to insure that the transmitter is keyed a sufficient time before the audio arrives so that the entire first speech syllable is transmitted 4 3 6 6 DTMF Detector A DTMF detector is implemented in DSP software that listens to the telephone line signal after the hybrid 4 3 6 7 DTMF Generator A generator is implemented
97. erations Manual 5 4 10 Speaker Phone Response SPKR_PH lt ON OFF gt Exx CR Type Synchronous Response To Speaker Phone Command This response indicates the Speaker Phone path status Examples SPKR_PH ON EO CR Status indicating that the Speaker Phone path is enabled SPKR_PH OFF CR Status returned indicating that the Speaker Phone path is disabled 5 4 11 Speaker Radio Response SPKR_RAD lt ON OFF gt Exx CR Type Synchronous Response To Speaker Radio Command This response indicates the Speaker Radio path status Examples SPKR_RAD ONEO CR Status indicating that the Speaker Radio path is enabled SPKR_RAD OFF CR Status returned indicating that the Speaker Radio path is disabled 5 15 JPS Communications Inc RTU 292 Operations Manual m mu 5 4 12 Speed Dial Response SD nn lt num is empty gt Exx CR Type Synchronous Response To Speed Dial Command This response shows the contents of a given speed dial memory location Examples SD 5 5551212 E0 CR Status indicating that speed dial location 5 contains the number 555 1212 SD 21 is empty EO CR Status indicating that speed dial location 21 is empty 5 4 13 Tel Line Phone Response TEL_LINE_PH lt ON OFF gt Exx CR Type Synchronous Response To Tel Line Phone Command This response indicates the Tel Line Phone path status Examples TEL_LINE_PH ON EO CR
98. ersion data The data is in the format a bb where a is the major version 0 9 and bb is the minor version 00 99 Example VER CR Command sent to the RTU 292 asking for the version data 2 00 EO CR Status returned from the RTU 292 showing version 2 00 with no errors 5 17 JPS Communications Inc RTU 292 Operations Manual m mu 5 5 CALL PROGRESS RESPONSES FROM THE RTU 292 The following section describes the responses the user may expect from the RTU 292 when Call Progress is active Call progress is active whenever the PSTN is off hook Table 5 3 Call Progress Responses CP_RING Exx CR Call Progress detects Ringback Call Progress detects a Busy signal No answer after the DIAL command originated a call No dialtone when the DIAL command originated a call The RTU 292 has answered an incoming PSTN call 5 6 RESPONSE ERROR CODES All responses from the RTU 292 include an error code This error code allows the user to see if there were any problems with a given command Unless otherwise noted the user may assume that a non zero error code indicates that the command was not acted upon Table 5 4 Response Error Codes EO No error 2 installed The previous command requested a resource which is currently busy An example of this would be a DIAL command received when the RTU 292 is already off hook The previous command may not be used at this time An example of this would be
99. ese LOCAL PHONE OPTION OPERATION Local Phone LOCAL TELEPHONE LINE INTERFACE 25 Location Of Internal Option Settings RR MAIN BOARD ege 1 2 4 19 Main Hybrid Test Procedure 6 3 Main PCB Assembly MAIN POWER SWITCH eee 3 1 E u RTU 292 Operations Manual Maintenance and Repair MANUAL PHONE PATCH PROCEDURE Microphone Circuit essssseeeeeene MISCELLANEOUS JUMPERS Motorola URC 200 radio Negative Acknowledge 3 9 Noise Generator 2 212120200 2 0200000000000000000000 NOISE reduction sei vedendo cer se e eed NULL Command js NULLE Resporise nreeet tem erem eta OPERATING THE RTU 292 FROM THE FRONT rete reete 3 13 Operation OPERATION t OPERATION 220 3 5 OPTION INTERFACE BOARD 4 25 Option Setting Details Optional Equipment Not Supplied 1 5 IQ oT TET 7 1 OPTIONS otis ene ee rette pede ned 1 5 OPTIONS INSTALLATION AND CONFIGURATION2 24 OPTIONS INTERFACE BOARD 1 3 Outline Dimensions eesseeeeeneenneee 2
100. eypad or a connected local phone set Once the current call is terminated the RTU 292 will revert to the pulse dialing mode Table 2 6 Dial Mode SWI1 4 Dial Mode Selection Off DTMF Pulse 0009 2 8 8 TELEPHONE RING VOLUME The telephone ringer volume may be set to a comfortable level with internal adjustment R156 If the ambient noise level in the RTU 292 s location makes it necessary to change the ringer volume rotate R156 clockwise to increase the volume and counterclockwise to decrease it 2 89 FULL HALF DUPLEX RADIO In full duplex operation the RTU 292 will simultaneously send transmit audio to the radio and take in its receive audio In half duplex operation the radio receive audio is muted while the radio is keyed This prevents a radio sidetone audio feedback loop in radios with sidetone audio This feedback loop hampers RTU 292 VOX operation Sidetone audio is transmit audio that is internally routed back into the receive audio when the radio is keyed allowing the radio operator to hear his transmission The Full Half Duplex selection is set by dipswitch SW2 8 The factory setting is SW2 8 On for Half Duplex preventing the feedback loop To set to Full Duplex operation receive audio not muted during transmit set SW2 8 to Off For Simplex Systems use the Half Duplex setting JPS Communications Inc 2 8 m mu RTU 292 Operations Manual Table 2 7 Full Half Duplex SW2 8 Full Half Duplex 2 8 10 SERIAL PORT B
101. fhook while it is not ringing K1 will be in the non energized state shown in the schematic This voltage drop will turn on Q5 which signals the offhook condition to the CPU board via J1 5 The local phone is made to ring by the CPU Board when it J1 9 is brought high turning on Q1 and energizing switches the ring generator U4 onto the telephone line The ring cadence is controlled by the CPU Board via the RING signal at J1 2 If the telephone goes offhook during the ring cycle the voltage drop across R18 turns on Q3 pulling J1 5 high Diodes CR1 and CR2 provide transient suppression for the audio circuitry JPS Communications Inc 4 26 m mu RTU 292 Operations Manual 5 Remote Control Protocol 5 1 GENERAL Included in this section are instructions for controlling the RTU 292 via its RS 232 serial communications port The protocol listed in this section is the standard command set that accompanies the standard software version If an RTU 292 is shipped with custom software that employs different commands a set of special version notes including a modified protocol will be shipped with the unit 52 RS 232 REMOTE CONTROL OVERVIEW The RTU 292 may be controlled and monitored remotely via its RS 232 interface The RS 232 interface consists of RX TX and Ground only Hardware and software handshaking are not used The serial format is 8 data bits 1 stop bit and no parity The baud rate is controlled by setting DIP switches on
102. fields JP1 and JP3 set the unit for either a Balanced or Unbalanced audio interface to the radio or other four wire device connected to the J2 RADIO Connector Set the jumper plug across JP1 pins 2 amp 3 for balanced input and across pins 1 amp 2 for an unbalanced Receive Audio input Similarly set the jumper plug across JP3 pins 2 amp 3 for balanced TX Audio output and across pins 1 amp 2 for an unbalanced output The factory setting for both input and output is balanced 2 7 JPS Communications Inc RTU 292 Operations Manual m mu 2 8 6 RXLINE INPUT IMPEDANCE The factory setting for the Receive Line input impedance is 600 Ohms but if a high input impedance for bridging is needed the impedance may be set to approximately 47k Ohm To set to high impedance move the jumper plug at JP2 from pins 1 amp 2 low 600 ohms to pins 2 amp 3 high 47k ohms 2 8 7 DIAL MODE The dialing mode of the RTU 292 s internal telephone is set by internal dipswitch SW1 4 dial mode choices are DTMF and 10pps Pulse DTMF should always be used if the RTU 292 is interfaced with a touch tone DTMF capable telephone line Note that even when set for pulse dialing the RTU 292 can still send DTMF tones onto the phone line to control automated systems such as voice mail After a call has been placed the user may press either the star or pound 7 key The RTU 292 will then produce tones in response to keypad presses from either the front panel k
103. g of the audio path between syllables or during pauses in speech SW1 switches 5 amp 6 set the hang time duration 7 4 2 2 Noise Reduction Algorithm The noise reduction algorithm operates by passing the audio through an adaptive FIR Finite Impulse Response filter The filter forms instantaneous bandpass filters around the relatively correlated information contained in speech these filters are not created around non correlated white noise causing it to be suppressed 7 4 5 VMM 100 INSTALLATION AND CONFIGURATION The VMM 100 is installed in the options tray opposite from the Options Interface Board The holes required for installation are included on the tray but standoffs are not permanently installed as this precludes the installation of other options at this location See Figure 7 3 Install the board with 6 screws standoffs lock washers and nuts Install the screws from the bottom side of the tray A cable tie down is also supplied and the VMM 100 option connector is assembled to the 10 pin Noise Reduction Connector J5 on the Options Interface Board set up the VMM 100 place the separate switches of eight position dipswitch SW1 per system requirements The LED on the board can be used to easily set the correct receive audio level which is necessary for optimal operation of the VMR and Noise Reduction Modes This LED normally indicates when speech has been detected but when the VMR function is turned off this LED becomes a s
104. h SWIS 2 8 15 TRANSMIT LEVEL SET UP MODE Dipswitch SW2 7 is used by the factory to enable a special set up mode See section 2 10 for instructions This switch must remain Off Normal Mode for standard operation Table 2 14 TX Level Set up Mode SW2 7 Set up Mode 2 8 16 MISCELLANEOUS JUMPERS The following jumpers are installed in the factory as required This explanation is provided in case they are accidentally removed and must be replaced Security Option Jumpers on J5 Unless a Security Option Interface Cable is plugged into J5 on the Main Board jumper plugs must be installed at J5 pins 4 amp 5 and pins 7 amp 8 Option Jumpers on J10 If the Option tray is not installed a jumper must be placed at pins 13 amp 14 of J10 This jumper allows normal operation of the unit when the Options Tray and the Options Interface Board are not installed 2 9 INTERCONNECT INFORMATION Interconnect cables should be shielded for best performance Figure 2 6 Interface Details gives simplified interconnect information about the unit 2 11 JPS Communications Inc RTU 292 Operations Manual m mu 2 9 1 TELEPHONE CONNECTION Connect the telephone line to the PHONE J1 RJ11C standard modular connector The unit will work with either an AC or DC telephone line Telephone line polarity is not important Note that the phone connections are repeated at the terminal block on the rear panel for convenience Only one phone line may be connected do
105. h mm ss Exx CR Type Asynchronous Response To Completion of a Radio Telephone call This response indicates that a Radio Telephone call has been terminated The response shows the elapsed time of the call The time is shown in 24 hour format Note the Call Logging Feature must be enabled before use See 3 7 12 Examples Status indicating that a radio telephone call has finished and the call lasted for 1 hour 12 minutes 34 seconds Connection dropped elapsed time 01 12 34 E0 CR Status indicating that a radio telephone call has finished and the call lasted for O hours 10 minutes 25 seconds Connection dropped elapsed time 00 10 25 CR 5 4 8 Handset Phone Response HS_PH lt ON OFF gt Exx CR Type Synchronous Response To Handset Phone Command This response indicates the Handset Phone path status Examples PH ON EO CR Status indicating that the Handset Phone path is enabled HS_PH OFF CR Status returned indicating that the Handset Phone path is disabled 5 4 9 Handset Radio Response 8 RAD lt ON OFF gt Exx CR Type Synchronous Response To Handset Radio Command This response indicates the Handset Radio path status Examples HS_RAD ON EO CR Status indicating that the Handset Radio path is enabled 9eHS RAD OFF lt gt Status returned indicating that the Handset Radio path is disabled JPS Communications Inc 5 14 m mu RTU 292 Op
106. he Handset Radio path HS_RAD ON CR Status returned showing that the Handset Radio path is enabled HS RAD CR Command requesting the status of the Handset Radio path 9eHS RAD OFF lt gt Status returned showing that Handset Radio is disabled JPS Communications Inc 5 6 m mu RTU 292 Operations Manual 5 3 10 Speaker Phone Command SPKR PH lt ON OFF gt CR This command is to enable disable or query the current status of the Speaker Phone path Expected Response Speaker Phone Response Examples SPKR PH ON CR Command to enable the Speaker Phone path SPKR_PH ON CR Status returned showing that the Speaker Phone path is enabled SPKR PH CR Command requesting the status of the Speaker Phone path SPKR_PH OFF CR Status returned showing that Speaker Phone is disabled 5 3 11 Speaker Radio Command SPKR RAD ONJOFF CR This command is to enable disable or query the current status of the Speaker Radio path Expected Response Speaker Radio Response Examples SPKR RAD ON CR Command to enable the Speaker Radio path SPKR_RAD ON CR Status returned showing that the Speaker Radio path is enabled SPKR RAD CR Command requesting the status of the Speaker Radio path SPKR_RAD OFF CR Status returned showing that Speaker Radio is disabled 5 7 JPS Communications Inc RTU 292 Operations Manual m u 5 3 12 Speed
107. he RTU 292 front using the SPEAKER PHONE and SPEAKER RADIO buttons 3 4 8 6 The call may also be monitored with the handset The operator may speak and listen to either the telephone party alone the radio party alone or both together using the HANDSET pushbuttons 3 4 8 7 When the conversation is complete the operator pushes the TEL LINE OFF button to disconnect from the phone line The TEL LINE RADIO and TEL LINE PHONE LEDs will both turn off indicating that the phone is back on hook disconnected 3 4 9 TRANSMITTER KEYING HALF DUPLEX SYSTEM For a normal half duplex radio link it is usual for the VOX in the RTU 292 to key the transmitter The VOX responds to signals from the telephone line and operates the keying circuits when voice is present Once the VOX has tripped it remains active for the selected hang time following the loss of audio to prevent dropout on pauses between syllables The unit also incorporates a short delay of the transmitted audio which allows the VOX to key the transmitter a short time before the audio arrives so that the RF output can be at full power to avoid missing part of the first syllable The VOX in the RTU 292 is generated within the DSP and is extremely sensitive and reliable However there are occasions when the audio level from the telephone line is too low to operate the VOX reliably or for some other reason it is desired to key the transmitter manually To do this operate the front panel
108. he new DSP used in the RTU 292 allows improved Call Progress Detection Additional circuitry on the Main Board provides the ability to detect line reversal when a telephone caller hangs up the phone allowing immediate call termination when used with phone systems that have Reverse Battery Signaling A new standard feature with the RTU 292 is RS 232 control of the unit A new optional feature is DTMF Access of the system via radio A front panel keypad allows DTMF or Pulse dialing and the built in handset is pushbutton selectable for communication with either the telephone or the radio Since the telephone may place and receive calls the operator can quickly and easily establish a phone patch connection When used in the manual mode the RTU 292 patches a telephone into a radio link by essentially the same method as with a conventional phone patch the quality of the patch however is greatly improved First a radio to radio link is established Then using the telephone in the RTU 292 the operator places a phone call to the distant telephone that will be patched into the radio link Once the telephone to telephone link is made the operator simply pushes a front panel pushbutton The RTU 292 adapts to the phone line and the distant phone becomes part of telephone to radio to radio communications link Once this link is established the operator may communicate with either party using the RTU 292 s handset and may monitor both sides of the conversa
109. heck both the time and the date by simply entering the remote control command TIME with no parameters The time and date that the RTC is set to will be returned If not correct set as explained below The RTC keeps track of leap years but not daylight savings time 7 7 2 Setting The Time Enter the command TIME hhmmss where hh is the hour 00 23 mm signifies the minutes 00 59 and SS gives the current seconds 00 59 7 7 3 Setting The Date Enter the command DATE ddmmyy where dd is the current date 01 31 mm is the month 01 12 and yy is the last two digits of the year 00 99 77 4 Call Logging Enable and disable call logging by entering as described above Once call logging is enabled whenever a radio to telephone connection is made a message is sent via RS 232 noting the beginning of the call and indicating the starting time and date When the connection is terminated another message is sent indicating the time and date and also listing the elapsed time of the call The elapsed time is provided in the format hh mm ss The elapsed time provided will be incorrect if any single radio to telephone connection exceeds 24 hours JPS Communications Inc 7 14 m mu RTU 292 Operations Manual 76 RADIO CONTROL OPTION When this software option is enabled the RTU 292 may be used to control a Motorola URC 200 radio connected to the unit via the RS 232 serial port The control commands may be entered by the RTU 292 front panel keypad
110. hone Option is installed This Local Phone set can make and receive calls via the outside line communicate with an operator at the RTU 292 or send and receive audio through the companion radio It can also be used to program the RTU 292 The Local Phone Option consists of a small Printed Circuit Board assembly that is installed in the RTU 292 options tray Theory of Operation information is included in section 4 7 31 LOCAL PHONE OPTION INSTALLATION AND CONFIGURATION The Local Phone Option is a small PCB that is installed to four threaded standoffs in the options tray with a ribbon cable assembly that runs from the option to connector J20 on the Main Board Figure 7 2 shows correct option placement in the options tray The telephone set and interconnect cable to the telephone set are not included with the option After the Local Phone Option is installed the main CPU must be informed by switching on the Local Phone Enable dipswitch SW1 7 on the Main Board Remember that these switches are only read at unit power up SW1 7 must be left off when the option is not installed SW1 8 enables the Local Phone Ring Through feature This causes the local phone to ring whenever a call is received by the RTU 292 via the PSTN input When ring through is disabled the local phone may still be used to send and receive calls but will not ring when a call is received Set SW1 8 to On to enable Local Phone Ring Through and Off to disable this feature This switch
111. i nm i e hene nite 3 13 3 7 7 RTU 292 PASSWORD PROTECTION te eir 3 16 3 7 8 INACTIVITY DISCONNECT TIMER itt th te xen 3 16 3 7 9 CALLING TIMER ini noe rr rrt it e a t e ivit e 3 16 3 7 10 USING THE RTU 292 SPEED DIAL enne nennen 3 17 3 31 OPTIONAL 4 WIRE OPERATION tntet re He e e n tiene 3 18 3 82 ehe eet NN PEE PER RENE RE 3 18 39 SPEED DIAL RESET peni eem EH e PIE RUNE 3 18 4 RTU 292 THEORY OF OPERATION eere eee notet tasas ensis taste sns 4 19 4 1 GENERA V M 4 19 JPS Communications Inc 4 m mu RTU 292 Operations Manual 4 2 FRONT PANEL BUTTONS AND INDICATORS sse ener enne nnn 4 19 43 MAIN BOARD enne EE eere tte eee ee pee ue oras 4 19 4 3 1 AUDIO BUS ARRANGEMENT 4 19 4 3 2 TELEPHONE INTERFACE CIRCUITS ne e O enne entren eren enn 4 20 4 3 3 RADIO INTERFACE CIRCUITS en 4 21 43 4 HANDSET SPEAKER INTERFACE nennen eren enne eene nnn 4 22 4 3 5 Rp m RE P E RARI tiene 4 22 4 3 6 DSP SOETWARE ree eR Dt in Pr 4 22 4 3 7 POWER SUPPLY ini IR PERDERE RUIN ERIS US 4 24 4 3 8 bu falsos 4 24 4 3 9 PROMPT
112. iated LEDs on TEL LINE RADIO HANDSET RADIO or SPEAKER RADIO The PTT switch need not be depressed when communicating with a second party via a PSTN line The handset earpiece audio level is controlled by the HANDSET volume control A convenient hanger for the handset may be attached to the left side of the front panel mounting screws are installed in the front panel remove the nuts from these screws throw the nuts away and use the screws to attach the hanger This hanger supplied in the RTU 292 s accessory kit may also be installed elsewhere on the equipment rack 3 2 5 SPEAKER The speaker allows monitoring of telephone line and or radio audio depending on the selections of the SPEAKER PHONE and SPEAKER RADIO monitor modes In addition the speaker serves as the telephone ringer for incoming calls The speaker volume except for the ring signal is controlled by the SPEAKER volume control located on the right side of the front panel The ring signal may be enabled or disabled by the AUDIBLE RING pushbutton The ring volume is controlled by an internal potentiometer R156 see section 2 8 3 1 JPS Communications Inc RTU 292 Operations Manual m mu 3 2 6 KEYPAD The 12 key keypad is used for telephone dialing It is active only when the TEL LINE PHONE path is selected Dialing may be either via DTMF mode or pulse mode as determined by internal dipswitch selection 3 2 7 SPEAKER VOLUME CONTROL This potentiometer controls the volum
113. ignal level indicator and will flash on voice peaks when the correct volume of speech containing signal is present To use this LED to adjust the volume of the audio input turn the VMR function off see Table 3 1 and inject speech at a normal speaking level into the module s audio input Adjust the input volume until the LED lights occasionally on voice peaks 7 1 JPS Communications Inc RTU 292 Operations Manual m mu The dipswitches on the VMM 100 module may be changed at any time during operation the DSP is constantly checking the states of these switches The VMR and Noise Reduction modes can be used individually or simultaneously They are toggled off amp on via standard DTMF Operational Commands See section 3 7 and Table 3 1 L NASHER DA vr 5 R N amp Al HELPS SET INPUT 41 SW E PROMPT 100 i TION 3 SEE TEXI Figure 7 3 VMM 100 Option Installation JPS Communications Inc 7 8 RTU 292 Operations Manual Table 7 6 VMM 100 SPECIFICATIONS GENERAL Frequency Response Input Level Input Impedance DSP Output Delay Noise Reduction Type Noise Reduction Audio Output Audio Output Distortion lt 105 100 to 3400 Hz 2dB 0 dBm nominal Unbalanced 10k Ohm Dynamic Peaking around cohe
114. isual indication of the ring signal incoming call is always provided 3 2 15 KEY PUSHBUTTON This pushbutton operates the key function of the RTU 292 sending a key command to the associated transmitter This button is functional at all times The red KEYED LED next to the KEY pushbutton is lit whenever a key command is sent to the transmitter from any source within the RTU 292 handset keyswitch or TEL VOX for example not just from the KEY pushbutton 3 2 16 PEAK LED This red LED flashes on audio peaks that are detected in the audio incoming from the receiver to indicate the proper adjustment of the internal RX LEVEL control R116 The input level is correct when the PEAK LED flashes occasionally on incoming receiver speech peaks If the LED flashes continuously the input level is too high and should be reduced see paragraph 2 10 Note that this LED does not respond to telephone audio 3 3 JPS Communications Inc RTU 292 Operations Manual m u 3 3 REAR PANEL CONNECTORS Accessible at the RTU 292 rear panel are the radio connector telephone line and local phone connector the signal terminal block the DC power terminal block an RS 232 connector and the AC power connector voltage selector fuse holder assembly See section 2 9 for full pin out information 3 31 RADIO CONNECTOR This male DB9 connector is the interface between a radio system and the RTU 292 It contains transmit audio receive audio and keylines 3 3
115. l Response Examples DIAL 5551234 CR Command requesting the RTU 292 to dial the number 5551234 DIAL 5551234 EO CR Status returned indicating that the number 5551234 was dialed DIAL OPER CR Command requesting the RTU 292 to call the Operator front panel DIAL OPER CR Status returned indicating that the call was placed to the Operator DIAL LP CR Command requesting the RTU 292 to call the Local Phone option DIAL LP E4 CR Error status returned indicating that the Local Phone option is not installed in this unit DIAL 5551234 CR Command requesting the RTU 292 to dial the number 5551234 DIAL 5551234 E5 CR Status returned indicating that the number could not be dialed because the unit is already off hook JPS Communications Inc 5 4 m mu RTU 292 Operations Manual 5 3 6 Disconnect Command DISC CR This command is used to drop the PSTN connections Expected Response Disconnect Response Examples DISC CR Command requesting that the PSTN be disconnected DISC CR Status returned indicating that the PSTN was disconnected 5 3 7 DTMF Command DTMF number string CR This command is used to generate DTMF tones via the PSTN line This is useful when the call involves the use of a calling card or automated phone system Note if the PSTN must already be off hook to use this command This is done by using the DIAL command or the TEL LINE PH command
116. nce the RTU 292 detects ringback the RTU 292 begins a 30 second timer and waits for the call to be answered If this does not happen before the timer expires the call attempt is terminated 7 6 5 After the Call Begins The call can now proceed and the Inactivity Timer will now begin to run If this time expires because no speech or other activity is heard the RTU 292 will give a series of 3 short beeps 7 13 JPS Communications Inc RTU 292 Operations Manual m u as a warning The radio caller or the phone user may initiate activity within 5 seconds of the warning beeps to reset the timer If neither user does so the unit will then terminate the call To terminate the call at any time the radio user may enter or give three squelch breaks within four seconds The phone user may enter to hang up 7 7 THE CALL LOGGING OPTION The RTU 292 contains a Real Time Clock RTC IC that allows the logging outgoing telephone calls via the unit s RS 232 serial communications port Full information regarding the use of this port is provided in section 5 The factory default setting disables Call Logging To enable enter the programming mode by the DTMF sequence 9 9 then enter 0 1 Finally enter to leave the programming mode See Tables 3 1 and 3 2 NOTE It is possible to enable this option remotely If you have purchased an RTU 292 without this option and want to add it contact JPS 7 7 1 Checking The Time And Date C
117. nd limited by the receiver s IF filters FM receivers however have too wide a noise bandwidth and will produce erroneous results using this procedure The receiver s noise output should be between 20dBm and OdBm so that the RTU 292 can be adjusted for the correct hybrid input level JPS Communications Inc 6 20 m mu RTU 292 Operations Manual Figure 6 1 Hybrid Balance Test Set Up 6 5 2 1 Main Hybrid Test Procedure 1 Disconnect the RTU 292 from all other equipment and connect the test equipment as shown in Figure 6 1 2 Set the PSTN levels for 9 dBm using Option SW2 1 2 and 3 3 Start with the following pushbuttons OFF TEL LINE PHONE TEL LINE RADIO and TEL VOX The positions of the other buttons are unimportant Place the RTU 292 in set up mode by setting SW2 7 ON and then turning on the power See paragraph 2 10 1 for further details about set up mode 4 Adjust the TX Level Adjust R133 so that the audio voltmeter reads 6dBm 0 387V rms This sets the transmit signal output path in the RTU 292 for unity gain if the input level is correctly set 5 Adjust the RX Level Adjust R116 so that the PEAK LED flashes rapidly and is on about 50 of the time This is different from the instructions in paragraph 2 10 3 which set the RX Level Adjust for voice 6 Remove the unit from Set up Mode by turning the RTU 292 Main Power OFF setting SW2 7 OFF and then turning the main power back ON 7 Push the TEL LINE RADIO but
118. nder modulated If the TX Level Adjust is increased in an attempt to compensate for a low meter indication level compression will likely result which will degrade system performance If there is any doubt about the amount of modulation being obtained monitor the RF output with an oscilloscope to observe the true conditions NOTE Avoid excessive level into the transmitter While most modern transmitters have modulation limiters which will not allow them to over modulate excessive level into the transmitter will cause level compression of the signal which effectively degrades the hybrid null provided by the RTU 292 This is particularly important with a full duplex system which may oscillate if too much level compression is used For best results adjust the TX Level Adjust so that the transmitter is just fully modulated by the test tone or actual phone line audio NOTE If the Transmit Level Set up Mode was used be sure to take the unit out of this mode after set up is complete by turning off the main power switching SW2 7 back to OFF and turning the power back on 2 10 2 SETTING THE RECEIVE LEVEL The audio level into the RTU 292 from the radio receiver is set by the internal RX Level adjustment potentiometer R116 The PEAK LED responds to the receiver audio coming from the radio and is provided as a guide to setting this level there are two peak LEDs CR24 on the Main Board as well as the front panel PEAK LED The TEL LINE RADIO butt
119. ne and telephone input signals to the transmitter output 4 3 3 3 Keying Circuits The key relay K2 provides two isolated outputs Signals Key Out and KB are the normally open contacts of both halves of K2 These signals are routed to P1 4 and P1 9 and are shorted to ground when the key relay is energized Signals from KEY IN and CPU KEY are summed in U24B and drive key relay driver Q4 Transistor Q5 is driven by the VOX key output from the DSP U24A ensures that the microphone key switch will not function unless enabled by the CPU board with the MIC KEY EN signal 4 21 JPS Communications Inc RTU 292 Operations Manual m u 4 3 3 4 DTMF Detector Circuit U25 is a DTMF detector decoder dedicated to listening for DTMF signals from the radio Its input is connected to the leveled radio receive signal at U20B 7 The DTMF data is read by the processor A separate DTMF detector running in DSP software listens for DTMF from the telephone line 4 3 3 5 FSK Modem Circuit U26 is a hardware FSK modem that listens for FSK signals from the radio at U20B 7 and can send FSK signals to the radio from U26 17 4 3 4 HANDSET SPEAKER INTERFACE 4 3 4 1 Microphone Circuit The handset is connected to J7 with the mic signal appearing on J7 5 Resistors R50 and R51 provide bias current for the electret or carbon microphone element electret is standard Components L3 C20 and L4 C23 provide filtering against conducted RF Amplifier U13A is th
120. nge An FM squelch which opens only when the proper sub audible tone is present Dual In Line Package Switch Also dipswitch A multi unit switch that fits into a standard DIP integrated circuit footprint It usually contains eight or ten individual switches Dual Tone Multi Frequency The standard touch tone telephone dialing method Digital Signal Processing or Processor Electronic Industries Association A communications system that can operate in transmit mode and receive mode simultaneously with different frequencies for transmit and receive See also Half Duplex and Simplex A communications system that uses different frequencies for transmit and receive operation but can not transmit and receive at the same time See also Full Duplex and Simplex A system with hangtime will remain in the transmit mode for the duration of the set hangtime beyond the time indicated by any keying inputs The hangtime prevents transmitter unkey during brief pauses in the transmission To key a transmitter means to cause it to transmit Light Emitting Diode Land Mobile Radio To quiet or inhibit audio Printed Circuit Board Push to Talk An active PTT signal causes a transmitter to key Receiver or Receiving A communications system that uses the same frequencies for both transmit and receive operation A simplex system can obviously not transmit and receive simultaneously See also Full Duplex and Half Duplex Signal to Noise Ratio
121. not use J1 and the telephone connections on the terminal block simultaneously Table 2 15 1 TEL LINE RJ 11C Pin Funct on 2 Telephone Line Connection A Telephone Line Connection B No Connection o _ 2 9 2 RADIO CONNECTION Connect the radio system to the RADIO J2 connector The TX output and RX input are designed to interface with 600 Ohm line connections at the radio but the RTU 292 audio interface is extremely flexible and can accommodate a wide variety of sources and loads By making different connections the inputs and outputs may be configured for balanced or unbalanced lines The balanced configuration is the factory default and should be used if possible because it is the most noise immune To change to the receive audio to unbalanced single ended input connect the receive audio to RXA only and change jumper JP1 on the Main Board to UNBAL To change to the transmit audio to unbalanced single ended output connect the transmit audio to TXA only and change jumper JP3 on the Main Board to UNBAL Figures 2 5 and 2 6 details the various audio interface options pin 4 the External Signal input is used as the Squelch Break input Key Out A and Key Out B are normally floating but pull to ground whenever the RTU 292 wants to key the associated transmitter The Remote Key Input may be pulled low to force the RTU 292 to key the associated transmitter JPS Communications Inc 2 12 m mu RTU 292 Operations Ma
122. nt panel keypad 3 7 6 1 OPERATING THE RTU 292 FROM THE FRONT PANEL KEYPAD The RTU 292 can be operated from its front panel to allow the unit to be programmed and if so equipped control a Motorola URC 200 radio When using the front panel the operator uses the handset and keypad To begin front panel operation the user must enter three keypresses The RTU 292 will respond with an Acknowledge tone prompt and the voice prompt READY At this point all front panel keypad entries are treated just as though the user were sending commands via the telephone or local phone Front panel control operation will continue until one of the following conditions occurs The user enters sequence e There is no PTT activity or keypad activity for the duration of the activity timer While the operator is using the keypad to control the RTU 292 the unit will not be available for e PSTN Auto Answering e Radio Squelch Break Access S W option e Radio DTMF Control S W option e Local Phone Control H W option 3 13 JPS Communications Inc RTU 292 Operations Manual m mu Table 3 1 Standard DTMF Operational Commands These commands may be entered by the RTU 292 front panel keypad or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option See 3 7 6 for special instructions regarding the use of the front panel keypad to send DTMF Commands DIMF Command Terminate the call Manual Keying
123. nted The solder or circuit side refers to the side opposite the components 6 4 ALIGNMENT No alignment is required or possible other than setting levels for the telephone line receiver input and transmitter output which are done as a part of the normal equipment setup procedure 65 PERFORMANCE TESTING This section describes how to test and verify the basic performance of the RTU 292 Extensive test procedures pin pointing the location of internal faults to the component level are beyond the scope of this manual 6 5 1 TEST EQUIPMENT REQUIRED 1 ea Audio Signal Generator 600 Ohm Output 1 ea Noise Generator or Radio Receiver See NOTE below 1 ea Audio Voltmeter Hi Z Input HP 400H or equivalent ea Resistor 560 Ohm to 680 Ohm 1 4W min 6 19 JPS Communications Inc RTU 292 Operations Manual m mu 6 5 2 HYBRID BALANCE MEASUREMENT The test procedure outlined below allows measurement of the hybrid balance or trans hybrid loss attainable with the RTU 292 This characteristic determines how much radio receiver input signal will leak into the transmitter output of the RTU 292 In the test set up the noise generator simulates the radio receiver the audio voltmeter simulates the transmitter and the resistor simulates the telephone line If the hybrid balance were perfect the trans hybrid loss would be and none of the receiver signal would leak into the transmitter the audio voltmeter in this set up would measure nothing except
124. nual Table 2 16 P1 RADIO DB 9 Male Pino o Function 0000007 Balanced Receive Audio Input B Chassis Ground Chassis Ground 3 6 Receive AudioInputA 8 Remote Key Input 9 Key Output B Relay Closure to Ground 2 9 3 HANDSET CONNECTOR The handset supplied with the RTU 292 is plugged into front panel Jack J7 Table 2 17 J7 HANDSET RJ12C Jack Earpiece Audio Ground 4 __6___ PTT Switch 0000000 2 13 JPS Communications Inc RTU 292 Operations Manual m mu 2 9 4 TERMINAL BLOCK The terminal block on the rear panel is supplied for convenience when interfacing the RTU 292 to a communications system The terminal block connections are in parallel with the I O terminals of the same name found on different connectors If the telephone line connections at Pin 1 and 2 of the terminal block are used to connect to PSTN line then the TEL LINE connector J1 should not be used Table 2 18 Terminal Block 6 Position Pin Function 0 2 Telephone Line Ring Telephone Line Tip L 6 Spare See Note Below NOTE In the RTU 282 Pin 6 of the terminal block was the Squelch In input also called External Signal In for use with the Squelch Break feature In the RTU 292 this input has been moved to a more appropriate location pin 4 of the P1 Radio Connector When retrofitting an RTU 292 into an existing RTU 282 installation it s possible to maintain the existing interface wi
125. o leave the programming mode JPS Communications Inc 3 16 m mu RTU 292 Operations Manual 3 7 10 USING THE RTU 292 SPEED DIAL FEATURE The RTU 292 has the ability of storing 99 telephone numbers in non volatile memory These numbers may be used when making a call using via UHF VHF radio with a DTMF keypad To use the speed dial feature simply enter the speed dial number instead of a telephone number Note The Voice Prompt Option is recommended if the speed dial feature is used but is not required Voice prompts are essential in assisting the user in programming reviewing and using the speed dial feature 3 7 10 1 Programming the Speed Dial Directory These numbers are programmed by first putting the RTU 292 into the programming mode To enter this mode enter the DTMF command 9 9 The RTU 292 will respond with its READY prompt 1 The user next enters the command 4 on the keypad of the RTU 292 the Local Phone telephone set or the keypad of a connected telephone See 3 7 6 for special instructions if the front panel keypad is used The RTU 292 gives the prompt ENTER SPEED DIAL LOCATION 3 The user enters two digits for the speed dial location A leading 0 is used for locations 1 9 For example when the user is programming speed dial location number 1 he must enter 01 The RTU 292 gives the prompt ENTER PHONE NUMBER The user enters the digits of the phone number When complete the user enters a
126. og In this way it is possible to implement functions such as the adaptive hybrid which would be impossible or impractical to implement using purely analog techniques In addition to the DSP chip itself the module contains two analog interface chips static RAM for audio storage and delay and a program flash memory chip 4 3 6 DSP SOFTWARE The DSP software is contained in a FLASH memory chip located on the DSP module All of the following functions are implemented in software by the DSP JPS Communications Inc 4 22 m u RTU 292 Operations Manual 4 3 6 1 Adaptive Hybrid The adaptive hybrid is the central function of the RTU 292 Its purpose is to separate and isolate the telephone receive signal by subtracting the telephone send signal from the mixed telephone send and receive signals If this subtraction is done perfectly the telephone receive signal is completely isolated The digital adaptive hybrid in the RTU 292 while not achieving perfection comes close and gives as much as 40 dB isolation when measured with a broadband noise source Comparable isolation for a conventional hybrid would likely be only 10 dB measured in the same way The adaptive hybrid samples the telephone send signal at A D 2 samples the mixed telephone send and receive signals on A D 1 and outputs the isolated telephone receive signal to the transmitter output amplifier on D A 1 The hybrid function also contains a threshold detector that allows VOX op
127. ogram memory a 27C256 providing 16k of address space Chip select signals for the various I O are provided by PEEL U6 Several devices on the CPU board use a 3 58 MHz clock signal that is provided by crystal Y2 and gates U12B and U12C U3 is a reset generator that ensures an orderly power up sequence for the microprocessor and associated components It senses the voltage on the 5V line and generates a reset while the voltage is below approximately 4 55V As the voltage rises above the threshold a delay is generated by C4 to insure processor clock stability before operation commences Resistor R5 prevents resetting on short spikes on the 5V line 4 25 JPS Communications Inc RTU 292 Operations Manual m u 4 5 3 VOICE PROMPT SOFTWARE The voice prompt board software receives the prompt number command through Jl and translates it into the prompt address in EPROM US 4 6 LOCAL PHONE OPTION The Local Phone Option allows a standard telephone set to be plugged into an RJ 11C modular jack at the rear of the RTU 292 This telephone set may then be used to place or receive calls via the RTU 292 to the PSTN or an associated radio The Local Phone Option can also be used to control the RTU 292 remotely changing various configuration options see section 3 7 4 6 1 INTERFACE CIRCUITRY Amplifier U3A generates the local telephone send signal This mixing amplifier accepts inputs from the dial busy generators U5 and U6 and from the local phon
128. on noise reduction or both The module s operating mode is set by logic inputs at P9 pins 3 and 4 7 4 2 1 VMR Algorithm The VMR algorithm works by passing the audio through a series of bandpass filters that are spaced throughout the speech frequency spectrum The outputs of these filters are then examined for signals with speech characteristics If speech is detected the audio path is enabled and the LED is lit The VMR threshold is set by SW1 switches 3 amp 4 This threshold is not volume related it specifies how stringent the VMR algorithm is when deciding whether a signal contains speech The correct setting will depend on many aspects of the incoming signal and the requirements of the user A lower threshold setting increases the likelihood that a signal which is comparable to speech but does not actually contain speech will be passed through A higher threshold will eliminate these false detections but will increase the possibility that a signal which contains speech that is strongly masked by noise will not be detected The default setting should be good for most signals The audio output is delayed allowing speech to be detected before audio arrives so that no syllables are missed SW switches 7 amp 8 set the duration of the delay There is also adjustable Hang Time which keeps the audio path enabled for an adjustable length of time after the instant when speech is no longer detected This hang time prevents the disablin
129. on must be ON for the PEAK LED to function The level is correctly set when the PEAK LED flashes occasionally once per second to once every few seconds in response to voice peaks in the incoming audio If the indicator flashes continuously the level is too high and must be reduced To set the level tune the receiver to a station with a strong signal that will provide maximum audio into the RTU 292 Turn the RX Level Adjust control clockwise to increase the level or counterclockwise to decrease the level as necessary until the PEAK indicator flashes JPS Communications Inc 2 16 m mu RTU 292 Operations Manual occasionally on voice peaks Note that the PEAK indicator responds only to incoming radio audio not telephone audio The range of the RX Level Adjust control is about 40 dBm to 10 dBm If the level from the radio is outside this range the correct level cannot be set using the RX Level Adjust control alone and it will be necessary to adjust the audio output at the radio itself until the correct level is obtained NOTE The proper operation and excellent performance of the RTU 292 will not be obtained if the audio level from the receiver into the RTU 292 is not set correctly Excessive audio will overload the telephone line and equipment causing distortion VOX falsing and poor hybrid operation In addition the telephone company may cut off a call in progress which contains audio high enough to bleed over into other circuits
130. one A QUERY is played whenever the user needs to enter some data such as a password or telephone number 3 7 1 4 Radio Is Keyed KEYED When the RTU 292 wants to signal that the user has keyed the radio it will play 1 short high pitched tone The RTU 292 will play KEYED whenever the user has manually keyed the radio by entering the correct telephone command 3 7 1 5 Radio Is Unkeyed UNKEYED When the RTU 292 wants to signal that the user has unkeyed the radio it will play 1 short low pitched tone The RTU 292 will play UNKEYED whenever the user has manually unkeyed the radio by entering the UNKEY telephone command 3 7 1 6 Disconnecting DISCONNECT When the RTU 292 wants to signal that it is dropping the radio communications link and hanging up the phone it will play 3 short high pitched tones The RTU 292 may disconnect for a number of reasons 1 Any time the user enters a star followed by a pound sign 2 Whenever Busy Tones or Reorder tones are heard on the phone line The DSP algorithms are always searching for call progress activity on the phone line 3 The unit will also disconnect if there is a lack of any activity on the phone line for a time longer that that set by the Inactivity Timer see Table 3 1 If the unit signals that it is dropping the link due to a lack of activity either party may prevent the disconnection by speaking within five seconds 4 Whenever Line Reversal Reverse Battery Signaling i
131. one number 7 5 3 Radio Caller Provides Calling Directions The radio user can then enter a phone number terminated by the sign or n n for speed dial location If the caller forgets to enter the RTU 292 will simply wait 4 seconds to ensure that data entry is complete and then begin to place the call If no DTMF is detected at the RTU 292 the unit will place a call to the telephone at the speed dial location 01 This is an auto call 7 5 4 RTU 292 Plays Back Phone Number amp Prompts for Confirmation The RTU 292 will play back the number it intends to dial In the case of speed dial numbers it only plays back the speed dial location and not the number stored at that location The RTU 292 then prompts the caller for confirmation with the prompt Please confirm by entering a single Star digit along with the Query tone prompt If the RTU 292 does not receive confirmation within five seconds it will give a Timeout prompt and go back to its waiting state 7 5 5 RTU 292 Places the Call The RTU 292 then informs the radio user that the call is being placed The ringback information that is provided when placing a call via the RTU 292 front panel keypad or Local Phone is not sent over the air due to FCC regulations The RTU 292 adapts to the phone line while placing the call 7 11 JPS Communications Inc RTU 292 Operations Manual m u If the number is busy the busy tones will be broadcast for appr
132. or may not be installable in an RTU 292 that has special software created by JPS to fit a non standard application If your RTU 292 has special software consult JPS customer service before ordering options Table 7 1 RTU 292 Options Hardware Options Local Phone Option 5930 596000 Allows remote operation of the RTU 292 through the use of a standard telephone set connected directly to the RTU 292 Local Phone port Telephone set and cable not supplied DTMF Telephone Set 5930 599000 Telephone set for use with the Local Phone Option Voice Prompt Option 5930 595000 Standard Version English female voice VMM 100 Option 5930 591100 Provides DSP Voice Modulation Recognition squelch and or DSP Noise Reduction to the radio RX input Software Options Call Logging S W Option 5970 791500 Provides record of calls via RS 232 interface Radio Control Option 5970 795000 Provides remote control of URC 200 radio via RS 232 int Squelch Break Access 5970 791300 Allows radio access to the RTU 292 via a series of squelch Option breaks DTMF Access Option 5970 799000 Allows radio access and control via the radio s DTMF keypad STU III Option 5960 796000 Allows connection to a STU III phone 7 1 JPS Communications Inc RTU 292 Operations Manual m mu 72 VOICE PROMPT OPTION When the Voice Prompt Option is installed the RTU 292 will send helpful prompts to system users to guide them in proper system operation and inform them of the c
133. oximately 5 seconds before the RTU 292 terminates the call attempt Once the RTU 292 detects ringback the RTU 292 begins a 30 second timer and waits for the call to be answered If this does not happen before the timer expires the call attempt is terminated 7 5 6 After the Call Begins The RTU 292 now enters its Command Mode meaning that the phone user may enter any of the available DTMF commands from Table 3 1 The Inactivity Timer will now begin to run If this time expires due to a lack of speech or other audio activity the RTU 292 will give a series of 3 short beeps as a warning The radio caller or the phone user may initiate activity within 5 seconds of the warning beeps to reset the timer If neither user does so the unit will then terminate the call To terminate the call at any time the radio user may enter at any time The phone user may also enter to hang up JPS Communications Inc 7 12 m mu RTU 292 Operations Manual 7 6 SQUELCH BREAK ACCESS OPTION This option allows a radio user who does not have DTMF capability to quickly place a telephone call via the RTU 292 The radio user simply transmits a series of squelch breaks and is then automatically connected to the telephone at the RTU 292 speed dial location 701 To use the squelch break feature the local radio s squelch output must be connected to the RTU 292 External Signal Input and the RTU 292 continuously monitors this line for the correct squelch br
134. pedance and is also frequency dependent It is the job of the DSP hybrid to remove the telephone send signal and pass only the telephone receive signal to the transmitter output circuits The inputs to the adaptive hybrid are A D 2 U1A 1 and A D 1 U2B 7 The DSP hybrid essentially subtracts JPS Communications Inc 4 20 m mu RTU 292 Operations Manual the signal at A D 2 from that at A D 1 and the difference appears on D A 1 which is named TEL after passing through gate U8C 4 3 2 3 Ring Detector and Tone Ringer Integrated circuit U7 is an optocoupler that senses the ring voltage on the telephone line When a ring voltage is detected U7 5 goes low with the frequency and cadence of the ring voltage This signal is fed to the DSP module on J14 28 where the DSP strips off the ring frequency and passes the a signal with the ring cadence alone on J14 7 to the ring tone generator circuit Circuits U31 and U32 form a tone ringer to provide the audible ring signal for the RTU 292 s speaker U32 is a 10 Hz oscillator which frequency modulates oscillator U31 via R41 Because of the modulation by U32 U31 switches between about 1000 Hz and 800 Hz at a 10 Hz rate producing a warble tone Normally both oscillators are held reset by J14 7 When ring voltage is detected J14 7 goes high allowing the oscillators to run 4 3 5 RADIO INTERFACE CIRCUITS 4 3 3 1 Receiver Input Amplifier The input from a receiver is connected to P1 1 and P1 6
135. r must be noted on the outside of the packing carton and on all accompanying documents When packing the unit for reshipment it is best to use the original packaging for the unit if this is not possible special attention should be given to providing adequate packing material around connectors and other protrusions such as front panel controls Rigid cardboard should be placed at the corners of the unit to protect against corner damage during shipment Failure to protect the corners of the front panel causes the most common type of shipping damage experienced on returned equipment Shipment should be made prepaid consigned to JPS Communications Inc Customer Service Department 5720M Capital Blvd Raleigh North Carolina 27616 USA Plainly mark with indelible ink all mailing documents as follows U S GOODS RETURNED FOR REPAIR 2 1 JPS Communications Inc RTU 292 Operations Manual m mu Mark all sides of the package FRAGILE ELECTRONIC EQUIPMENT Inspect the package prior to shipment to be sure it is properly marked and securely wrapped 2 4 INSTALLATION OVERVIEW Follow these four steps to properly install the RTU 292 1 Provide mechanical mounting for the unit Rack slides or shelves are required for 19 rack mounting 2 Provide the proper primary power for the unit 3 Interconnect the unit with the radio and system as appropriate 4 Check Section 2 8 to ensure that the unit is adjusted and configured as desired The RTU
136. rent signals Approximately 10 20 dB 10 Ohm unbalanced 0 dBm nominal Less than 0 5 1 kHz VMR Performance Probability of detection Pd gt 95 at 0 dB VMR Output Delay S N ratio 0 300 ms adjustable VMR Hang Time 0 75 2 25 sec adjustable in half second Indicators increments Audio Level Speech Present LED 5 75 x 3 0 printed circuit board Power Requirements 5 VDC 200 mA nominal 5 VDC 12 VDC 5 mA nominal 20 mA nominal ENVIRONMENTAL Operating Temperature 20C to 4 55C Storage Temperature 40C to 4 Humidity Shock Vibration Altitude 85C Up to 95 55C MIL STD 810D method 516 3 procedure VI MIL STD 810D method 514 3 Category I Up to 10 000 ft 7 9 JPS Communications Inc RTU 292 Operations Manual Table 7 7 Signal Audio Input see specs above Audio Output see specs above NRI Logic Input Low selects NR2 Logic Input Low selects Input see specs above 5V Supply Input see specs above 12V Supply Input see specs above 5V Supply VMM 100 I O CONNECTOR INFORMATION P9 DSP Noise Reduction DSP Voice Modulation Recognition NR3 Logic Output Follows state of SW1 1 Low indicates default is NR on NR4 Logic Output Follows state of SW1 2 Low indicates default is VMR on Ground JPS Communications Inc Table 7 8 SW1 1 FUNCTIONS For future use leave off SWI 3 4 FUNCTIONS SWI1 4 On Off Off SWI 5 6 FUNCTIONS SW1 6 On On
137. residual noise The RTU 292 trans hybrid loss specification is at least 30dB when measured with a noise source with an output bandwidth that matches the RTU 292 s bandwidth This means that the noise output measured by the audio voltmeter should be at least 30dB below the noise input to the RTU 292 s hybrid The test is performed with a 600 Ohm resistor simulating the phone line in order to have a repeatable standard impedance on which to base the specification In actual use the hybrid balance of the RTU 292 is excellent into impedances other than 600 Ohm such as the complex impedances of the telephone lines and is far better than any conventional hybrid under these conditions The procedure for this test using a noise generator is listed in paragraph 6 5 2 1 If a noise generator is not available the alternate test method that employs an audio signal generator see paragraph 6 5 2 2 may be used Figure 6 1 shows equipment interconnections necessary to perform this test NOTE The accuracy of the trans hybrid loss measurement depends on the bandwidth of the noise generator used to perform the test It is possible however to achieve an evaluation of the unit to within a few dB tolerance without a commercial noise generator by using the audio output of an SSB or AM receiver that has no antenna connected This type of receiver with a 2 5 to 3 5 kHz SSB IF bandwidth makes an ideal noise generator for this measurement because the output noise is ba
138. ring with the Squelch line connected to pin 6 of the Terminal Block For this to work an internal jumper must be added from to E11 on the main El is located just below J12 the connector that interfaces the terminal block to the main PCB E11 is at the back of the PCB beneath the terminal block connections JPS Communications Inc 2 14 m mu RTU 292 Operations Manual 2 9 5 RS 232 CONNECTION Use P2 on the rear panel to connect to the RTU 292 RS 232 interface RS 232 control is fully explained in section 5 Table 2 19 P2 RS 232 Connector DB 9 Male 2 10 AUDIO LEVEL SETUP AND ADJUSTMENTS For proper operation of the RTU 292 the radio transmit and receive levels must be properly set The radio receiver level into the RTU 292 is of particular importance because excessive level here can cause telephone line overloading distortion VOX falsing and poor hybrid operation It is also important that the output level to the transmitter be set so that excessive compression does not occur in transmitters with a compressor 2 10 1 SETTING THE TRANSMIT LEVEL There are two ways detailed below to set the transmit level First apply TX audio by one of two methods A Use a 1 kHz test tone supplied by the RTU 292 when in the Transmit Level Set Up Mode or B simply speak into the telephone line to supply typical audio to the RTU 292 Next rotate the internal TX Level Adjust R133 so that the transmitter is just fully modulat
139. rol pushbutton switches 5V onto its control line when ON and open circuit when OFF Pulldown resistors on each of the control inputs pull the line to ground when its button is OFF The buttons are read by the processor on the Main Board The processor not the pushbuttons controls the unit s audio gates as well as the front panel LEDs 43 MAIN BOARD Main Board Circuitry is detailed in Figure 8 2 4 3 4 AUDIO BUS ARRANGEMENT The audio switching is bus oriented Each major bus is named after the output signal that it carries for distribution with the major buses as follows Signal Name Source Comment TEL U8C 11 Telephone Receive Signal MIC 15 7 Amplified AGC d Microphone Signal RXA U22D 6 Amplified Radio Receiver Signal RING U33A 2 Telephone Ringer Signal DTMF J13 32 DTMF Dialer Output The bus signals are each gain leveled to a nominal 0 dBm 0 775V rms average amplitude except for the hybrid in out signals which are usually at a 12 dBm 0 194V rms The bus signals are routed to various destinations through analog gates controlled by signals from the CPU on the Main Board 4 19 JPS Communications Inc RTU 292 Operations Manual m mu 4 3 2 TELEPHONE INTERFACE CIRCUITS 4 3 2 1 Telephone Send Circuits Amplifier U1B generates the Telephone Send signal the audio which is sent down the phone line from the RTU 292 UIB is configured as an inverting stage with its gain set by a combination of input and feedback resisto
140. rrors Finally the response string is terminated by a Carriage Return character Table 5 2 Response Summary NULL Response Exx CR Auto Answer Response ANS lt ON OFF gt Exx CR Call Starting Response Radio Telephone Connection Made dd MON yy hh mm ss Exx CR Dial Response DIAL lt OPER LP number string Exx CR Disconnect Response DISC Exx CR DTMF Response eDTMF number string Exx CR Elapsed Time Response Connection dropped elapsed time hh mm ss Exx CR Handset Phone Response HS_PH lt ON OFF gt Exx CR Handset Radio Response HS_RAD lt ON OFF gt Exx CR Speaker Radio Response SPKR_RAD lt ON OFF gt Exx CR Speed Dial Response SD nn lt num is empty Exx CR Tel Line Phone Response TEL_LINE_PH lt ON OFF gt Exx CR Tel Line Radio Response JeTEL LINE RAD lt ON OFF gt Exx CR Time Date Response dd MON yy hh mm ss CR Version Response VER a bb Exx lt CR gt Call Progress responses are listed in section 5 5 Response error codes are outlined in section 5 6 5 11 JPS Communications Inc RTU 292 Operations Manual m mu 5 4 1 NULL Response Exx CR Type Synchronous Response To NULL Command This response is given after receiving a NULL command No data is returned in the response Example CR Command sent to the RTU 292 CR Status returned from the RTU 292 5 4 2 Auto Answer Response AUTO_ANS
141. rs selected by analog gates U4A through U4D The send level calibration assumes that there is a 0 dBm signal level at the input to UIB on U8B 15 If the setup is done properly this is assured by the PEAK LED which is set to flash at a peak level equivalent to 0 dBm The calibration is such that when a 600 Ohm load is placed on the telephone line terminals the signal level at TP3 will be 3 dB lower than stated send signal level This 3 dB margin allows some headroom for peaks in the program material without overdriving the phone line Resistor R1 establishes the output impedance of the telephone send amplifier and in parallel with R11 determines also the terminating impedance for the phone line Zener diodes CR2 and CR3 protect the circuitry in the RTU 292 from high voltage spikes on the phone line 1 1 Audio transformer T1 couples the RTU 292 to the phone line Capacitor C1 compensates the leakage inductance of the transformer to produce a flat frequency response Capacitor C2 keeps the phone line DC current out of Instead of using the secondary of T1 to sink the phone line DC holding current an active constant current load is used which consists of CR1 Q1 and Q2 and associated components The constant current load provides a means of sinking the DC holding current from the phone line so that the RTU 292 will seize and hold the line Bridge CRI corrects the DC polarity so that a positive voltage is always applied to the collector of Q1
142. s 8 and 9 JPS Communications Inc 6 22 m mu RTU 292 Operations Manual 6 5 3 VOX SENSITIVITY MEASUREMENT The following test procedure measure the sensitivity of the VOX in the RTU 292 This is the amplitude of the incoming signal from the telephone line required to trigger the VOX NY Figure 6 2 VOX Sensitivity Test Set Up 6 5 3 1 WOX Test Procedure 1 Disconnect the RTU 292 from all other equipment and connect the test equipment as shown on Figure 6 2 2 The PSTN level setting must be known To determine this remove the top cover and note the positions of SW2 1 2 and 3 3 Start with the following pushbuttons OFF TEL LINE PHONE and TEL LINE RADIO Push the TEL VOX button ON The positions of the other buttons are unimportant 4 Set the audio signal generator frequency to 1 kHz with an output amplitude of less than 40dBm 7 7mV rms 5 Push the TEL LINE RADIO button to start the adaptation cycle 6 When the initial adaptation cycle is complete slowly increase the audio generator amplitude until the Keyed LED on the RTU 292 comes on The audio generator amplitude at this point read directly by the audio voltmeter is the VOX sensitivity The VOX trip point is dependent on the setting of the PSTN levels and the VOX sensitivity setting It should be 16 2 dB below the PSTN setting as listed in the table below VOX Sensitivity VOX Trip Point MAX 19 2 dB below the PSTN setting MED 16 2 dB below the PSTN setting
143. s detected on the phone line 3 7 2 VOICE PROMPTS If the RTU 292 is equipped with the Voice Prompt Option it will prompt the user for input and signal its current status to the user status by playing pre recorded messages called voice prompts Tone prompts are played before each voice prompt For example if the RTU 292 wanted the user to enter the password it would play the QUERY tone sequence followed by the voice prompt Enter Password The number of different tone prompts is limited because the average user cannot be expected to remember more than a few However since voice prompts are largely self explanatory the RTU 292 has more than 30 different voice prompts The remainder of this section includes a description of the voice prompts that the unit provides at appropriate times during unit operation These prompts are only heard if the Voice Prompt Option is installed 3 73 CALLING THE RTU 292 VIA THE OUTSIDE LINE If the RTU 292 is set for Automatic Answer AUTO ANSWER LED lit it will answer an outside call after 2 rings Once the unit answers the phone the caller controls the unit by sending commands via the keypad of a DTMF telephone Rotary style telephones cannot be used to control the RTU 292 JPS Communications Inc 3 10 m mu RTU 292 Operations Manual The following paragraphs describe the sequence of operations used to automatically place a call through the RTU 292 to a radio via the outside phone line This description a
144. se may be only used into field wire or dedicated or private lines which are KNOWN to accommodate higher levels The send and receive levels are set by SW2 1 2 3 as follows Factory default settings are indicated by an asterisk Table 2 3 Telephone Send Receive Levels SW2 1 SW2 2 SW2 3 on O diim Off JPS Communications Inc 2 6 m mu RTU 292 Operations Manual 2 83 VOX HANGTIME The RTU 292 VOX circuitry holds the radio in the keyed state for a short time after the telephone audio signal is no longer detected This delay called hangtime ensures that the VOX 15 not de activated between syllables or during short pauses in speech The standard VOX hangtime duration is 2 0 seconds Dipswitch SW2 6 allows the setting of 0 6 seconds hangtime if required The factory default setting SW2 6 On sets the VOX hangtime to the longer 2 0 second setting and SW2 6 Off sets it to 0 6 seconds Table 2 4 VOX Hangtime SW2 6 Key Tone Detection 2 84 VOX SENSITIVITY The RTU 292 VOX circuitry has four sensitivity levels minimum low medium factory setting and maximum A higher setting will be more able to detect weak or noisy voice signals but will be more likely to false on ambient noise entering the telephone handset A lower setting will do the opposite SW2 4 and SW2 5 control the unit s VOX Sensitivity levels Table 2 5 VOX Sensitivity SW2 4 SW2 5 VOX 2 8 5 BALANCED UNBALANCED RADIO INTERFACE Internal jumper
145. ssumes that the RTU 292 has a Voice Prompt Option installed Units without a Voice Prompt Option will function identically except for a lack of voice prompt messages The tone prompts listed in 3 7 1 are provided by the RTU 292 whether or not the Voice Prompt Option is installed 3 7 3 1 The Caller Dials The RTU 292 When a call is made over the telephone line by a distant telephone to the RTU 292 the unit answers the phone and plays the greeting voice prompt RTU 292 Automatic Phone Patch If password protection is enabled the unit plays the QUERY tones followed by the Enter Password voice prompt If password protection is not enabled the unit will move directly to the adaptation process 3 7 3 3 3 7 3 2 The Caller Enters The Password if enabled The password is a sequence of numbers 0 9 The password may range from 1 digit up to 10 digits When the RTU 292 is shipped from the factory it is given the default password 123 4 The password may contain only numbers no or characters If the user enters an incorrect password the RTU 292 will give him two additional tries If the unit has the Voice Prompt Option installed voice prompts will guide the user in trying again to enter the correct prompt Otherwise the Query prompt will be given If the correct password is still not entered after three tries the unit will then play the DISCONNECT tones and immediately hang up When the unit receives the correct password it moves on to
146. stat IC dig 74HCOON quad NAND JPS Communications Inc 6 26 Reference Designator C103 C3 29 35 125 C91 C21 33 42 80 124 126 C112 C43 44 C128 96 97 113 115 117 119 123 C34 62 63 65 67 68 69 74 95 10 11 13 14 15 22 25 26 27 32 120 121 92 93 C31 4 7 24 37 38 39 41 46 47 59 64 C1 20 23 61 66 70 81 85 107 108 C8 9 28 30 40 45 60 71 72 73 75 78 82 84 90 94 98 102 109 122 130 155 159 168 C2 83 110 111 114 116 118 127 129 12 87 C36 86 JP1 JP2 JP3 J5 J19 to Options 710 718 720 J15 713 714 J4 122 J8 6 79 712 716 3 P12 JP1 3 J5 J11 71 21 7 YLY2 Y3 CRI CR36 CR30 32 35 38 39 40 CR4 7 8 9 CR12 16 20 23 37 CR2 3 CR5 6 CR31 For U70 72 Q24 L34 5 L1 2 6 L7 8 9 For Y1 2 3 For U73 U10 48 U59 U38 50 53 62 63 024 47 65 66 m mu RTU 292 Operations Manual 5970506100 RTU 292 Main PCB Assembly continued Part No Description Reference Designator 933074154 IC dig 74HC154N 4 16 decoder U43 44 933074244 IC dig 74HC244N 3 state driver U54 57 60 61 933074373 IC dig 74HC373N octal d latch U39 58 933741390 IC dig 74HC139 2 4 Decoder U42 935681101 IC dig 68HC11A0FN w o EEPROM U46 936074742 IC dig 74ALS74N Dual D FF Adv U64 939016430 IC dig DS1643 150 real time cloc 041 950020020 Inr TDA2002V 8W audio 117 953118100 Inr LT1181CN 5V RS 232 U37 953145436 Inr MC145436 RCVR U25 9
147. t to the RTU 292 it is buffered up and acted on as soon as possible Once the command has been executed the RTU 292 will return a Status response The format of this status response is explained in greater detail in the section 5 4 Status Returned From The RTU 292 The RTU 292 is designed to act on one command at a time The user must wait for a response from a given command before entering the next command Table 5 1 Command Summary Null Command SCR uut din dera Auto Answer Command AUTO ANS lt ON OFF gt CR Audible Ring Command AUD RING lt ON OFF gt CR Date Command DATE lt ddmmyy gt CR Dial Command DIAL lt OPER LP number string CR Disconnect Command DISC lt gt Generate DTMF command DTMF number string CR Handset Phone Command HS PH ONJOFF CR Handset Radio Command HS RAD lt ON OFF gt CR Speaker Phone Command SPKR PH lt ON OFF gt CR Speaker Radio Command SPKR RAD lt ON OFF gt CR Speed Dial Command SD lt nn ALL gt num CR Tel Line Phone Command Tel Line Radio Command Time Command Software Version Command TEL LINE PH lt gt CR TEL LINE RAD lt ON OFF gt CR TIME lt hhmmss gt CR MER CR
148. ted associated LED ON the VOX is active and the key relay is energized when the VOX circuitry detects a signal from the telephone line The VOX PTT output has a hang time to keep it from dropping out during short pauses in speech The hang time duration is the length of time that the PTT signal will remain active following the loss of detection of signal The hang time is internally adjustable see section 2 8 If the TEL LINE RADIO LED continues to flash for more than ten seconds after the TEL LINE RADIO pushbutton has been pressed to make a connection the unit has not adapted properly and VOX operation will not be possible 3 2 13 AUTO ANS BUTTON This pushbutton may be used to manually enable LED ON or disable LED OFF the Auto Answer feature When enabled the RTU 292 is in the Automated Operation Mode and the unit will automatically answer the phone after 2 rings See section 3 7 for a description of the Automatic Operation capabilities of the RTU 292 3 2 14 AUDIBLE RING BUTTON This button determines if the ring from an incoming telephone call will be heard via the RTU 292 s speaker When the Audible Ring mode is enabled the ring signal will be audible in the speaker The ring volume is independent of the SPEAKER VOLUME setting and is set internally by adjustment R156 Regardless of the position of the AUDIBLE RING button the LED indicator associated with the TEL LINE PHONE button flashes on an incoming ring so that a v
149. terminated If either the radio user or the PSTN caller initiates activity within 5 seconds of the warning beeps the timer is reset Inactivity Disconnect Timer lengths of 2 minutes to 120 minutes or disabled are available Enter 9 9 to enter the programming mode then 2 x to set the timer The value of x sets the timer length See Table 3 2 for the list of timer durations The value of x 0 will disable the timer so that the connection may be maintained indefinitely Unless a permanent connection is required disabling the timer is not recommended If the telephone caller does not correctly terminate the call the unit can become locked up in the connected state Once the desired timer length is set enter to leave the programming mode 3 7 9 CALLING TIMER The Calling Timer determines how long the RTU 292 will attempt to place a telephone call Once the timer expires the RTU 292 terminates the attempt Note that if the unit detects a busy signal or other feedback that indicates that the call cannot be placed the attempt will be immediately terminated Two Calling Timer lengths either 30 seconds or 1 minute are available Enter 9 9 to enter the programming mode then 3 x to set the timer The value of x sets the Calling Timer duration 3 0 sets the Calling Timer to the factory default length of 30 seconds 3 1 sets the timer to 1 minute Once the desired timer length is set enter t
150. the adaptation process See 3 7 3 4 for instructions related to changing the existing password 3 7 3 3 The RTU 292 Adapts To The Phone Line The RTU 292 hardware has an Adaptive Hybrid that is controlled by a Digital Signal Processor DSP The hybrid matches the RTU 292 to the telephone line and also allows the radio to be keyed automatically by detecting the presence of the caller s voice on the telephone input This Voice Operated Transmit method of keying is called VOX Note that the VOX will be activated for any type of signal on the input whether it is speech or any other energy above the VOX sensitivity level Before the DSP can accurately detect the caller s voice the RTU 292 must first adapt to current phone line conditions During the adaptation process the DSP will momentarily emit white noise on the phone line This noise burst sounds like a loud hiss It is important for successful adaptation that the caller does not talk or enter any DTMF commands during the adaptation process It helps to keep the phone line as quiet as possible The adaptation process will normally take less than two seconds to complete but under noisy line conditions the process may take as long as 10 seconds During the adaptation process the DSP measures the white noise that is reflected back from the phone line and matches the RTU 292 to minimize the reflected signal This process is completely automatic and requires no user adjustments After the DSP has
151. this local phone may then be used in place of the unit s keypad and handset Input and output levels are internally adjustable to accommodate all types of radio systems A set up mode allows the adjustment of the RTU 292 receiver and transmitter signal levels without any external test equipment The unit will interface all types of two wire lines such as normal dial up lines dedicated lines or twisted pair field wire Although the output impedance is fixed at 600 Ohms the adaptive hybrid in the unit will give excellent hybrid balance regardless of the impedance of the line connected to the unit The unit operates from 115 or 230 VAC 47 to 63 Hz or from 12 or 24 28 VDC nominal the 12VDC range extends from 11 to 15 VDC while the 24 28 VDC range extends from 22 to 30 VDC It is packaged in a rugged enclosure measuring 3 5 H x 19 W x 12 D All inputs and outputs including those for power are filtered or protected as appropriate to enable the RTU 292 to meet the requirements of FCC Part 15 rules for a Class A Digital Device 1 3 ASSEMBLIES The standard RTU 292 contains five PC board assemblies the main board with plug on adaptive hybrid DSP board three front panel switch PC board assemblies and the Options Interface Board which is mounted in the Options Tray where other option boards may be installed Mounted on the front panel along with the switchboards are a speaker control potentiometers phone jack and handset jack The v
152. tion This circuitry is reverse polarity protected by schottky diodes in series with the voltage lines If sufficient AC and DC power are simultaneously applied the unit will draw power from the AC line only Its auto take over feature will draw DC power only if the AC line sags The DC supply input is filtered by choke L2 and by capacitors C50 and C51 If the DC input is 12V this filtered supply feeds the BUS directly via CR34 and supplies 12V around U70 via CR33 It also supplies voltage directly to the inputs of the 5V regulators through CR39 and R213 and through CR40 and R214 If the DC input is 24 28V the BUS is fed through emitter follower Q24 which keeps the bus voltage from rising above about 24V when input voltages of 24V to 32V are used 4 3 8 CPU The CPU portion of the main board controls all functions of the RTU 292 This board uses the front panel switches and keypad as well as the RS 232 serial communications port and signals received over the telephone as control inputs The Main board lights front panel LEDs to display its current status and controls the audio gates on the audio portion of the main board to route signals to their correct destinations Refer to pages 5 6 amp 7 of Figure 8 2 The RTU 292 is controlled by microprocessor U46 The program that runs U46 resides in EPROM U40 The unit s current status is stored in EEPROM U41 Octal latch U39 creates address lines AO through A7 from the data bus and the
153. tion contained in this manual is the property of JPS Communications Inc and is intended for the purchaser s use only It may not be reproduced without the express written consent of JPS Communications E JPS Communications Inc Phone 919 790 1011 Fax 919 790 1456 e mail jps jps com 5800 Departure Drive Raleigh NC 27616 JPS Communications Inc 2 m mu RTU 292 Operations Manual 1 3 Table of Contents GENERAL INFORMATION eere eerte sn sons 1 1 1 1 SCOPE 5 uedevimtarcm tae OU I at e e nid ue etae es 1 1 12 DESCRIPTION serotonin RU OI D S SR ete Min cis 1 1 1 2 1 GENERAL 2 55 etie te de OD M emen ee te 1 1 1 3 ASSEMBLIES 1 2 1 3 1 MAINBOARD tinet i eR BR i tete eta feces ee Ns 1 2 1 3 2 FRONT PANEL SWITCH 1 3 1 3 3 OPTIONS INTERFACE BOARD 2 reet eer Te OR PO HIER I HER ELE 1 3 1 3 4 ied RR 1 5 VP Unn 2 1 2 1 GENERALE P He EN Ui e EP E 2 1 22 UNPACKING AND INSPECTION tert rere e tme e t E RED tout mede e 2 1 23 RESHIPMENT OF EQUIPMPBENUES 2 erret o ette t ree n PER DR e EE De THE 2 1 2 4 JANSTAELATION OVERVIENW terere rer D er per o ede 2 2 2 57 IN
154. tion with the speaker The RTU 292 uses a unique adaptive hybrid implemented with a DSP Digital Signal Processor to eliminate conventional VOX and hybrid adjustments for a quick and simple set up The unit works by measuring the characteristics of the telephone line A short burst of white noise is placed on the telephone line During this burst the adaptive hybrid in the unit measures the signal reflected from the phone line and adapts the RTU 292 to the impedance of the phone line minimizing the reflected signal This achieves a broadband hybrid balance on the reactive phone line This is simply not possible with any type of conventional active or passive hybrid Not only is a deep broadband null provided but also the action is completely 1 1 JPS Communications Inc RTU 292 Operations Manual m mu automatic The unit will continuously adapt to changing line conditions making operation insensitive to line impedance changes In the Automated Operations mode the RTU 292 combines the unique features of its adaptive DSP hybrid with fully unmanned auto dial auto answer capability In its standard configuration the unit uses tone prompts to signal the remote user of the operations that must be performed to control the unmanned radio station The addition of a Voice Prompt Option supplies a large number of spoken prompts to simplify control The Local Phone Option allows a standard telephone set to be plugged into the rear panel of the RTU 292
155. ton to start the adaptation cycle 8 When the initial adaptation cycle is complete the noise output can be read on the audio voltmeter The voltage should be less than 37dBm 10 9 mV The trans hybrid loss is the difference between this reading and the approximate 7 dBm noise level 6 21 JPS Communications Inc RTU 292 Operations Manual m mu 6 5 2 2 Alternate Hybrid Test Procedure This alternate test procedure uses a more easily obtainable audio signal generator in place of the noise generator While this procedure cannot give a complete picture of the unit s performance in actual use it will allow a determination of whether or not the RTU 292 is operating properly 1 Disconnect the RTU 292 from all other equipment and connect the test equipment as shown in Figure 6 1 except use an audio signal generator in place of the noise generator 2 Set the PSTN levels for 9 dBm using Option SW2 1 2 and 3 3 Start with the following pushbuttons OFF TEL LINE PHONE TEL LINE RADIO and TEL VOX The positions of the other buttons are unimportant Place the RTU 292 in set up mode by setting SW2 7 ON and then turning on the power See paragraph 2 10 1 for further details about set up mode 4 Adjust the TX Level Adjust R133 so that the audio voltmeter reads 6dBm 0 387V rms This sets the transmit signal output path in the RTU 292 for unity gain 5 Set the output amplitude of the audio signal generator to about OdBm 0 775V rms Adj
156. urrent system status The standard language is female English though other languages and genders may be purchased an additional fee to create the non standard prompts is charged Contact JPS for details 7 21 INSTALLATION AND CONFIGURATION The Voice Prompt Option is a small PCB that is installed to four threaded standoffs in the options tray with a 20 wire cable from the option to connector J7 on the Options Interface board which is also installed in the options tray Figure 7 1 shows correct option placement in the options tray After the Voice Prompt option is installed the main CPU must be informed by switching on the Voice Prompts Enable dipswitch SW1 6 on the Main Board Remember that this switch is only read at unit power up No other configuration settings or adjustments are required Table 7 2 Voice Prompts Enable SE Off Disabled 7 2 2 OPERATION Since the Voice Prompt Option is very commonly used its operational instructions are included in section 3 RTU 292 Operation Theory of Operation information is included in section 4 JPS Communications Inc 7 2 RTU 292 Operations Manual Figure 7 1 Voice Prompt Option Installation 7 3 JPS Communications Inc RTU 292 Operations Manual m mu 73 LOCAL PHONE OPTION The RTU 292 has an extra rear panel modular phone jack that allows a standard DTMF telephone set to be plugged directly into the unit when the Local P
157. ust the RX Level Adjust so that the PEAK LED just comes on This will set the average noise level into the RTU 292 s hybrid to approximately 0dBm 6 Remove the unit from Set up Mode by turning the RTU 292 Main Power OFF setting SW2 7 OFF and then turning the main power back ON 7 Set the audio generator frequency to about 1 kHz 8 Push the TEL LINE RADIO button to start the adaptation cycle 9 When the initial adaptation cycle is complete the tone output can be read on the audio voltmeter The voltage should be typically less than 50dBm 2 5mV The trans hybrid loss is the difference between this reading and the approximate OdBm tone level NOTE The reading should be made as soon as the adaptation cycle is complete The RTU 292 continuously adapts itself to the conditions to which it is exposed With the single tone input presented by this test the unit will eventually adapt to reject only this single tone instead of the intended broad range of frequencies This may take several seconds to several minutes and an erroneous reading will result when this happens The reading will always be correct and an accurate depiction of operation under normal conditions immediately following the initial adaptation cycle since the unit has adapted broad band using its own noise source and has not yet had time to adapt to the single tone only 10 To measure the unit at a different frequency change the audio generator frequency and repeat step
158. utput levels and also provide impedance transformation and output drive capability Audio gates controlled by the front panel switches and the CPU route the audio as desired by the operator 1 3 1 4 DSP Module The plug in Digital Signal Processor DSP module is the heart of the unit as the adaptive hybrid is implemented with the DSP From a hardware standpoint the DSP section consists of a DSP chip interfaced with dual analog interface ICs static RAM for audio storage and delay and a program flash memory IC From a software standpoint the following functions are implemented in software in the DSP section the adaptive hybrid the VOX an audio peak detector the noise generator for measuring the telephone line characteristics an audio delay and the transmit setup tone generator 1 3 1 5 CPU Section This section contains the microprocessor and program software that controls all operations of the RTU 292 Various I O devices read external inputs and the front panel controls The inputs are processed and audio gates front panel LEDs audio prompts etc are controlled accordingly 1 3 1 6 Power Supply Section The power supply in the RTU 292 is a quiet and reliable passive regulator type It furnishes regulated voltages of 12V 12V 5V and 5V to the unit 1 3 2 FRONT PANEL SWITCH ASSEMBLIES There are three separate front panel switch assemblies that contain the pushbutton switches and LED indicators for the RTU 292 Each of thes
159. will be no audio present Note that radio receive audio and telephone audio may be simultaneously monitored 3 4 3 PLACING A TELEPHONE CALL 1 Ensure that telephone audio will be available at the handset HANDSET PHONE LED is ON Connect the RTU 292 to the outside phone line by pressing the TEL LINE PHONE button listen for the dial tone When dial tone is heard dial the desired number using the keypad The handset will function like an ordinary telephone handset If desired the phone conversation may also be monitored via the front panel speaker by depressing the SPEAKER PHONE switch SPEAKER PHONE LED ON Prevent feedback by controlling speaker volume and keeping the handset a sufficient distance from the speaker To hang up press the TEL LINE PHONE button or the TEL LINE OFF button so that the TEL LINE PHONE LED goes out 3 5 JPS Communications Inc RTU 292 Operations Manual m mu 3 44 RECEIVING A TELEPHONE CALL NOTE The handset to telephone path may be left in the enabled condition HANDSET PHONE LED ON even when the unit is not connected to the telephone line Only one button TEL LINE PHONE must then be pushed to answer the telephone The following scenario assumes that the HANDSET PHONE LED is already ON 1 When the ring is heard or the flashing TEL LINE PHONE LED is observed indicating an incoming call push the TEL LINE PHONE button and speak into the handset It isn t necessary to press the handset

Nortel Networks RTU-292 User's Manual

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