Data Comm for Business, Inc.
Contents
1. S2 9 2 10 When ON selects an operating baud rate of 19 2 Kbps for Data Channel A If this switch is in the ON position Data Channel B becomes inactive When OFF baud rate 19 2 Kbps is not selected for Data Channel A When ON this switch selects EXTERNAL TRANSMIT CLOCK for Data Channel A In this mode the 2200LV accepts a data clock for this data channel on its ETC lead Pin 24 of the RS 232C connector When OFF INTERNAL TRANSMIT CLOCK is selected for Data Channel A In this setting the 2200LV uses its own clock for the transmit data from the DTE and provides this clock to the DTE on Pin 15 of the RS 232C connector Not Used When ON baud rate 2 4 Kbps is selected for Data Channel B When OFF baud rate 2 4 Kbps is not selected for Data Channel B When ON baud rate 4 8 Kbps is selected for Data Channel B When OFF baud rate 4 8 Kbps is not selected for Data Channel B When ON baud rate 9 6 Kbps is selected for Data Channel B Note that 19 2 Kbps is not available for Data Channel B and selection of 19 2 Kbps for Data Channel A renders Data Channel B inoperative When OFF baud rate 9 6 Kbps is not selected for Data Channel B When ON EXTERNAL TRANSMIT CLOCK is selected for Data Channel B When OFF INTERNAL TRANSMIT CLOCK is selected for Data Channel B 7 FRONT PANEL INDICATORS AND CONTROLS The following describes the ten green LED indicators located on the front of the unit and the operation of the front panel r2. When not lit this LED indicates that the 2200 is sending a MARK to the DTE on the receive data lead OR Carrier Detect is low not asserted indicating a loss of valid signal at the receiver of the 2200LV XMT DATA B Same as above for Data Channel B RCV DATA B Same as above for Data Channel B The front panel LOOPBACK switch is a rocker type with three positions The center position is the NORMAL position When in this position the 2200LV operates normally and will transmit and receive voice and data information to and from the far end companion unit When LOOPBACK is placed in the left position LOC the 2200LV is put into its local loopback condition In this mode the 2200LVs transmit 56 Kbps information is looped back to its receiver and an all ones condition is transmitted to the far end unit This mode is used for troubleshooting and diagnostics per Section 10 below When 10 LOOPBACK is placed in the right REM position the 2200LV will send a unique loopback signal to the companion 2200LV at the far end causing it to perform a network loopback back towards the local 2200 see Section 10 Note that when the LOOPBACK switch is either in the left LOC or right REM positions the accompanying LED is lit indicating a loopback test condition After 2 minutes if the switch is left in these positions the test is terminated and the LED will go off indicating the test has timed out 8 VOICE OPERATION The 2200LV provides tw
3. this interface is arranged as a DTE type and is capable of either providing or accepting a transmit data clock INTEGRAL CLOCK GENERATOR The 2200LV Voice Data Multiplexer offers two timing modes for synchronization Slave timing derived from the transmit clock of the V 35 interface or Internal Master timing via an internal crystal oscillator and provided to the network through the External Transmit Clock pin of the V 35 interface This offers flexibility by allowing the unit to work in various network configurations including multi point private networks EXTENSIVE DIAGNOSTIC CAPABILITIES The 2200LV offers several test modes for diagnostic purposes It can perform several types of loopbacks designed to isolate and identify faults within the entire network The unit can be placed in a Local Loopback mode which removes it from the external network and causes the data and voice channels to be looped back upon themselves This provides a simple means for testing the 2200LV for proper operation The Remote Loopback mode sends a unique signal to the far end 2200LV causing it to present a loopback back towards the near end This enables the user to test the digital circuit all the way to the far end 2200LV multiplexer Simple status lamps on the front of the unit indicate proper operation USE OF VLSI TECHNOLOGY The 2200LV utilizes Very Large Scale Integration VLSI technology to insure high reliability maximum performance low
4. 217 352 3207 FAX 217 352 0350 19 20
5. ETC Pin 24 Data Terminal Ready DTR Pin 20 Request to Send RTS Pin 4 Receive Data RxD Pin 3 Receive Clock RC Pin 17 Clear to Send CTS Pin 5 Data Set Ready DSR Pin 6 Carrier Detect CD Pin 8 Signal Ground SG Pin 7 Protective Ground PG Pin 1 The modular jacks for the voice telephone connections are of the RJ 11C type with the following wiring Two wire Pair Tip amp Ring Pins 3 amp 4 After you make the 56 Kbps aggregate voice and data connections the installation needs only the correct setting of the DIP switches as described in the next section The POWER LED should be on steady and the SIG LED should be lit indicating a successful clock signal is being received through the V 35 interface If a 2200LV is already connected to the 56 Kbps digital channel at the far end the SYNC LED should be lit indicating the reception of a valid signal from the companion 2200LV at the far end of the 56 Kbps digital channel 6 DIP SWITCH SETTINGS The 2200LV comes from the factory with all of its DIP switches set as shown in Figure 1 The two DIP switches need to be properly set for each particular user s application In general the first DIP switch S1 controls the operation of the two voice channels and the 56 Kbps channel connection and the second DIP switch S2 controls the operation of the two data channels Both DIP switches need to be set properly for the unit to function correctly see Figure 1 The two DIP swit
6. Greater than 20 dB at O dBm0 Idle Noise Less than 30 dBrnC Frequency Response Relative to 1000 Hz level 2 dB 300 3000 Hz Dialing Supports tone DTMF and pulse dialing Overvoltage Protection Per FCC Part 68 requirements V 35 Interface Aggregate Interface Synchronous 56 Kbps V 35 Connector 34 Pin female standard V 35 type Clocks Transmit Clock slave mode External Transmit Clock master mode Receive Clock General Number of Voice Channels Ports 2 Voice Type 16 Kbps ADPCM derived from mu law companded 8 bit PCM 8000 Hz sample rate Number of Data Channels Ports 2 Data Type Synchronous or asynchronous RS 232C compatible Aggregate 56 Kbps V 35 Transmit Timing Source V 35 Transmit Clock Slave or internal crystal timing source Master Diagnostics Local Loopback and Remote Loopback Regulatory Meets or exceeds applicable requirements of FCC Part 15 for Class A computing devices and UL requirements for AC powered equipment and equipment connected to the telephone network 18 Physical External Power Supply 90 to 140 VAC 60 Hz UL listed source Power Dissipation Less than 4 watts internal idle less than 10 watts when voice circuits busy Environment 0 to 50 degrees C up to 95 RH non condensing Size 3 5 x 10 8 x 11 in H x W x D Weight 4 5 Ibs SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE For further information contact DCB CORP 807 Pioneer Champaign IL 61820 PHONE
7. present in a standard telephone line connection see Figure 3 2200LV IN PLAR MODE 2200LV IN PLAR MODE FIGURE 3 PLAR CONFIGURATION 12 PLAR In this mode the 2200LV and its far end companion provide a point to point hot line connection see Figure 3 Both units near and far must be optioned as PLAR circuits A telephone instrument is connected at each end Figure 4 When either phone is placed in the off hook condition a busy condition is transmitted to the far end 2200LV This will cause the far end phone to ring The ringing will continue at a rate of 2 seconds of ringing 4 seconds of silence until the far end party answers or the near end calling party abandons the call attempt A special feature of the 2200LV prevents an inadvertent continuous ringing condition by allowing the far end telephone to ring only twenty times After twenty ringing cycles the 2200LV will cease to ring the phone until the near end hangs up then reinitiates the call The ringing load of each channel should be limited to two standard phones see FXS section 9 DATA OPERATION The 2200LV is designed to provide two RS 232C data channels ports These ports may be used to provide end to end connectivity for synchronous or asynchronous data The 2200LV data channels may be user configured for speeds of 2 4 4 8 or 9 6 Kbps Additionally one data channel Data Channel A may be configured for a transmission speed of 19 2 Kbps When used in 19 2 Kbp
8. treat the parity bit as a data bit There is no restriction on the number of stop bits When operating in this mode the transmit and receive clocks at the RS 232C interface are not used The user should be aware that in this mode the 2200LV will not pass an UNFRAMED BREAK from one end to the other Asynchronous data speeds below 2400 bits per second can be handled in any format and any speed by placing the corresponding 2200LV channel in 9 6 Kops synchronous mode The data will be transmitted and received through the sync data circuits and will provide acceptable performance for any standard low speed asynchronous terminal or other device CONTROL LEADS The 2200LV supports several control leads for each RS 232C in both sync and async mode The 2200LV will accept as inputs in addition to data and clock Data Terminal Ready DTR and Request to Send RTS The 2200LV will provide as outputs in addition to data and clocks Data Set Ready DSR Clear to Send CTS and Carrier Detect CD The 2200LV responds to Request to Send with the assertion positive voltage of Clear to Send after a timed delay The RTS CTS delays are as follows Data Speed RTS CTS Delay 2 4 Kbps 8 milliseconds 4 8 Kbps 4 milliseconds 9 6 Kbps 2 milliseconds 19 2 Kbps 1 millisecond DTR received from the DTE has no effect on the 2200LV other than the transmit data LEDs on the unit s front panel will illuminate only when DTR is asserted DSR asserted by the 2200LV ind
9. 00 bits per second operation of Channel A uses the bandwidth of both channels precluding the use of Channel B as a separate data channel The data received from the 56 Kbps aggregate at the far end is fed from the multiplexer circuit to a First In First Out buffer of 16 bits in the data channel receive circuit The output of the FIFO is then sent to the DTE in accordance with the Receive Clock RC through the RS 232C interface on Pin 3 ASYNC DATA Async data is handled in either of two ways by the 2200LV At speeds of 2 4 4 8 9 6 or 19 2 Kbps the user must select the correct speed setting as in the sync data mode and must select ASYNC operation S1 7 and or S1 8 The user may select one channel as SYNC and one channel as ASYNC if so desired Again if Data Channel A is operating at 19 2 Kbps either sync or async Data Channel B is inoperative When operating at 2 4 4 8 9 6 or 19 2 Kbps async data is processed through the microprocessor of the 2200LV The data is reformatted in a pseudo packetized format for transmission to the far end within the 9600 bit per 13 second bandwidth allowed for each channel The microprocessor receives and sends the data to and from a UART which provides the timing conversions necessary for the handling of asynchronous data To operate properly in this mode the data must be formatted as either EIGHT BIT NO PARITY or SEVEN BIT WITH PARITY The sense of the parity does not matter since the 2200LV will
10. B CORP 1989 University Lane Suite Lisle IL 60532 708 241 0909 3 APPLICATIONS The 2200LV Voice Data Multiplexer provides end to end connectivity for two voice circuits and two data circuits over a 56 Kbps digital channel such as provided by a T1 multiplexer or digital microwave system The 2200LV connects to DTE Data Terminal Equipment via the two DB 25 RS 232C interface connectors mounted on the rear panel of the unit The DTE can be one of many devices such as computer mainframes mini computers workstations CAD CAM equipment multiplexers LAN bridges video display terminals video conferencing equipment high speed printers etc Typical applications include connection of terminals at a remote location to a mainframe at a central location or connections of a remote PC to a LAN See accompanying diagrams The 2200LV is a time division multiplexer whose operation is independent of traffic density or data usage The 2200LV provides a data connectivity pipeline for the two data channels extended over the 56 Kbps facility The 2200LV connects to voice telephone equipment through RJ 11C type six pin modular jacks located on the rear panel of the unit The two voice circuits of the 2200LV provide end to end connectivity for two standard telephone circuits with loop signaling ringing and dialing control Typical applications are for remote connection of a telephone to a PBX station circuit off premise station or remote co
11. Data Comm for Business Inc 2200LV VOICE DATA MULTIPLEXER USER S MANUAL TECHNICAL PUBLICATION A98 2200LV REVISION B JANUARY 1992 WARNING This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference when operated in a commercial environment Operation of this equipment in a residential area may cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference including possible disconnection of the equipment Copyright Data Comm for Business Inc All rights reserved Printed in USA TABLE OF CONTENTS 1 GENERAL 1 2 FEATURES AND BENEFITS 1 3 APPLICATIONS 3 4 INSPECTION AND INITIAL SELF TEST 4 5 INSTALLATION 5 6 DIP SWITCH SETTINGS 6 7 FRONT PANEL INDICATORS AND CONTROL 9 8 VOICE OPERATION 10 9 DATA OPERATION 13 10 TEST MODES AND MAINTENANCE 14 11 WARRANTY 15 12 REPAIR AND RETURN PROCEDURES 16 13 SPECIFICATIONS 17 1 GENERAL The DCB 2200LV is a Voice and Data Multiplexer designed to operate over 56 Kbps data channels derived through various facilities such as through T1 multiplexers T
12. E OF VOICE INTERFACES The 2200LV provides several varieties of interfaces for its two voice circuits The units may be provisioned to provide a standard telephone interface for dial up access Foreign Exchange Subscriber FXS mode direct connection to a PBX line port or outside telco provided line Foreign Exchange Office FXO mode or automatic ringdown from telephone to telephone Private Line Automatic Ringdown PLAR mode Each mode is selected by a single switch setting located conveniently on the rear panel of the unit The 2200LV is compatible with virtually all telephone sets private automatic branch exchanges PBX and telco provided standard telephone lines FLEXIBLE CHOICE OF DATA INTERFACES The 2200LV offers a wide range of choices for the RS 232C data interfaces on the local side Each of the two data channels may operate at speeds of 2 4 4 8 or 9 6 Kbps The first channel may be optioned to operate at 19 2 Kbps which then precludes the use of the second channel Additionally the channels may be optioned for either sync or async operation and the user may select either DTE or DCE transmit clock for each channel when in synchronous mode When in synchronous mode the 2200LV is independent of both data protocol and format FLEXIBLE 56 KBPS V 35 INTERFACE FOR NETWORK AGGREGATE OUTPUT The 2200LV provides a V 35 aggregate interface towards the network To facilitate easy connection to a DSU CSU or higher order multiplexer
13. MAGES ARISING OUT OF OR CAUSED BY THE USE OF OR THE INABILITY TO USE ANY DCB PRODUCT THIS WARRANTY IS MADE IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED AND OF ALL OTHER LIABILITIES ON THE PART OF DCB ALL OTHER WARRANTIES INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED BY DCB AND ITS REPRESENTATIVES 12 REPAIR AND RETURN PROCEDURES If a unit is in need of repair call DCB for a Return Material Authorization RMA number and return the defective unit freight prepaid along with a brief description of the problem to DCB CORP 1989 University Lane Suite Lisle IL 60532 Attn Repair and Return Dept As specified in our warranty DCB will repair and return the unit at no charge to the customer providing that the warranty period has not expired and that the unit has not been damaged through misuse If a critical out of service situation exists a replacement unit can be obtained within 24 hours in most cases A purchase order number will be required to insure return of the replacement unit Out of warranty service or replacement is also available Contact DCB or its authorized representative for more information 16 13 SPECIFICATIONS Data Interfaces User Interface RS 232C supported through DB 25 connector Data Speeds 2 4 4 8 9 6 or 19 2 channel A only Kbps for synchronous or asynchronous data user selectable Asynchronous speeds below 2 4 Kbps can b
14. al Transmit Clock pair When the 2200LV at one end of a circuit is in MASTER mode the unit at the other end of the circuit must be in SLAVE mode When OFF the 2200LV operates in the SLAVE timing mode In this position the timing for both the transmit and receive directions are derived from the transmit and receive clock signals received through the 56 Kbps V 35 channel interface Use this switch setting for connection of the 2200LV to digital DSU CSU devices connected to 56 Kbps private lines or for connection of the 2200LV to a V 35 port on a higher order multiplexer such as a T1 multiplexer For this type of connection the 2200LV units at both ends of the circuit should be in SLAVE mode The second DIP switch S2 controls the operation of the two data channels as follows S2 1 When ON selects an operating baud rate of 2 4 Kbps for Data Channel A When OFF baud rate 2 4 Kbps is not selected for Data Channel A S2 2 When ON selects an operating baud rate of 4 8 Kbps for Data Channel A When OFF baud rate 4 8 Kbps is not selected for Data Channel A S2 3 When ON selects an operating baud rate of 9 6 Kbps for Data Channel A When OFF baud rate 9 6 Kbps is not selected for Data Channel A got vyo FOV EEG 2252259462 maw RREQe MOE iatk fe 2225 wea FGFae ob KENEEN tial 3 Figure 1 2200LV Rear Panel DIP Switche sync lt a J z ZZ g 2 SYNC B SLAVE S2 4 S2 5 S2 6 S2 7 S2 8
15. ches S1 and S2 are located on the rear panel of the 2200LV The first DIP switch S1 controls the two voice channels and the 56 Kbps V 35 interface Switch S1 is to be set as follows S1 1 When ON puts Voice Channel A in FXS mode This is the mode that interfaces to the telephone set for ordinary telephone line type applications In FXS mode an incoming call will result in the telephone set being rung and outgoing calls will allow either tone or pulse dialing to be sent from the telephone set to the network When OFF FXS mode is not selected for Voice Channel A S1 2 When ON puts Voice Channel A in FXO mode This is the mode to be selected when this voice port is to be connected to the line side of a PBX or connected directly to a standard telephone line In this mode the unit accepts ringing signals to indicate an incoming call and the unit provides on off hook and dialing information to the switch or telco Normally when one voice port of the 2200LV is optioned for FXO mode the corresponding voice port on the companion 2200LV unit located at the far end of the telephone line is optioned for FXS mode In this manner the 2200LV pair will extend normal telephone operation over the digital 56 Kbps facility When OFF FXO mode is not selected for Voice Channel A S1 3 When ON PLAR mode is selected for Voice Channel A In PLAR private line automatic ringdown mode a telephone set is connected to the voice port The voice port of the com
16. d current talk battery for a local telephone instrument See Figure 2 By monitoring the presence or absence of current to the telephone instrument the 2200LV detects whether the phone is idle on hook or busy off hook This 11 information is then transmitted to the far end 2200LV which must be placed in FXO mode The on hook or off hook information is then relayed to the telephone switching equipment by the far end FXO unit Pulse dialing information is handled in the same way as on hook off hook since pulse dialing consists of rapid changes in on hook off hook states Tone dialing consists of audio frequency tones and is therefore transmitted in digitized form through the voice paths see discussion above rather than through the signalling circuits When a busy condition is received by a 2200LV in FXS mode from the far end this represents an incoming call condition This causes the 2200LV FXS circuit to provide a ringing signal 86 Vrms 20 Hz to the telephone set This ringing signal will continue in accordance to the information received from the far end unit until the called party answers or the call is abandoned by the calling party The ringing source within the 2200LV can ring up to two phones per voice channel The user should be careful to limit the ringer equalvalence applied to each of the two voice channels to 2 0 or less CAUTION Excessive ringing loads on the voice channels can cause damage to the units Each c
17. d of the telephone line The receive portion of the 2200LV voice circuit provides the inverse functions The 16 Kbps compressed digital voice signal is presented to the ADPCM processor by the output of the multiplexer circuit The ADPCM processor then expands de compresses the signal back to a full 64 Kbps voice signal to be acted upon by the digital to analog converter The D to A converter then converts the digital signal back to analog it is passed through a low pass filter to eliminate the effects of the sampling frequency level adjusted and then passed through the line interface circuit to be presented to the two wire telephone pair This completes the end to end process of two wire to four wire conversion digitization compression multiplexing and transmission at one end then reception demultiplexing expansion conversion back to analog and application to the two wire telephone interface at the other end Signalling on hook off hook dialing ringing is handled separately from the voice signals in the 2200LV Signalling information is transmitted from one 2200LV to its companion unit at the far end by means of a dedicated bit within the 56 Kbps multiplexed aggregate signal one dedicated bit for each of the two voice channels The signalling information transmitted varies depending on the operating mode selected for the voice channel The three operating modes are described below FXS In this mode the 2200LV provides DC voltage an
18. e accommodated by operating in 9 6 Kbps synchronous mode Supported Leads Transmit Data Receive Data Transmit Clock sync External Transmit Clock sync Receive Clock sync RTS CTS DTR DSR and CD RTS to CTS Delays 8 milliseconds at 2 400 bps 4 milliseconds at 4 800 bps 2 milliseconds at 9 600 bps 1 millisecond at 19 200 bps Input Elastic Buffer 32 bits Transmit Data Timing synchronous operation Provided by DCE TC or DTE ETC user selectable Synchronous Data Format Any Asynchronous Data Format 8 Bit no parity or 7 Bit with parity odd or even for speeds of 2 4 Kbps or greater Soeeds below 2 4 Kbps may be accommodated in any format by operating the channel in synchronous mode Voice Interfaces signal User Interfaces Two wire single pair Tip and Ring supported through Ru 11C six wire type modular jack Signalling Types Loop start FXS interface to telephone set loop start FXO interface to station line or telephone line originating from central office switch or PBX or PLAR hot line between two phones Ringing Signal 86 Vrms 20 Hz two standard phones per channel maximum Longitudinal Balance Greater than 45 dB 200 4000 Hz Input Transmit Level O dBm 600 ohms at 1000 Hz produces a 0 dBm0 digital reference 17 Output Receive Level A 0 dBm0 received digital reference signal 1000 Hz produces a 6 dBm 1 dB output 600 ohms at Tip and Ring Signal to Noise Ratio
19. e female receptacle marked POWER on the rear of the 2200LV Then plug the wallmount transformer into any standard grounded 110 VAC outlet 2 Observe the front panel LED s light emitting diodes The LED marked POWER should be illuminated All other LEDs should not be lit 3 Next place the front panel switch marked LOOPBACK in the position marked LOC left The LED next to the switch and the LED marked SYNC should illuminate This basically indicates normal operation of the unit Place the LOOPBACK switch back to its normal center position 4 Next connect the unit to the 56 Kbps synchronous channel using a standard V 35 cable The unit should be functional when connected to an active 56 Kbps channel through the V 35 port If a valid signal is received by the 2200LV from the 56 Kbps V 35 channel the LED marked SIG will light Having done this the 2200LV is ready for connection to the customer side equipment per the next section INSTALLATION 5 INSTALLATION Installation of the 2200LV requires no special tools adjustments or measurements Installation of the 2200LV consists of properly setting the two ten position DIP switches S1 and S2 located on the rear panel of the unit and connecting the voice and data equipment to the connectors on the unit s rear panel Connection to the 56 Kbps derived channel is accomplished by connecting the unit to the 56 Kbps channel equipment with a V 35 cable Installation of the voice and data equipme
20. hannel should be connected to the equivalent of two ringers or less FXO The FXO mode is the inverse of the FXS mode see Figure 2 Indeed to operate properly a 2200LV optioned for FXS mode must have a 2200LV optioned for FXO mode at the other end and vice versa When in FXO mode the 2200LV s signalling circuits are conditioned to detect an incoming ringing signal representing an incoming call and to provide a DC path loop closure to the PBX or central office switch to indicate on hook off hook status When ringing is detected the FXO end will send a busy indication to the FXS unit at the far end thus instructing it to ring its phone When the far end FXS unit detects an off hook condition it sends a busy to the near end STATION PORT S6Kbps DIGITAL CHANNEL 2200LV IN FXS MODE 2200LV IN FXO MODE FIGURE 2 FXS FXO CONFIGURATION SoKope DIGITAL CHANNEL FXO which then provides an off hook loop closure state to the telephone switching system In this manner the FXS FXO pair together make the two 2200LV units at the two ends of the 56 Kbps line appear transparent to the operation of a normal telephone line Thus the user may establish the same type of telephone services over the circuit derived through the use of the 2200LV multiplexers that he or she could by direct connection over a normal telephone pair In other words the 2200LV multiplexer will not interfere and will pass essentially unchanged the signalling normally
21. he 2200LV provides four user interfaces two voice two data These four inputs are derived from a multiplexed signal transmitted received through a standard V 35 type 56Kbps interface Such 56 Kbps interfaces are provided by separate DSU CSU devices or are derived through the local interface of a higher order multiplexer such as that used to terminate T1 lines The 2200LV s advanced design compact size and reliability make it an ideal product for most applications requiring the transmission of simultaneous voice and data over a dedicated 56 Kbps digital channel 2 FEATURES AND BENEFITS SIMULTANEOUS VOICE AND DATA OPERATION The unit operates synchronously through a single 56 Kbps digital channel on the network aggregate side and provides two sync async data connections and two standard voice telephone type connections on the customer local side The four user interfaces are independent of each other and may be operated simultaneously through the single digital 56 Kbps output No blocking or slowdown of data or throughput will occur STANDARD INTERFACE CONNECTORS The unit contains a 34 pin V 35 type connector for the 56Kbps interface as well as standard DB 25 connectors for the two data interfaces on the local side The voice interfaces are terminated through standard RJ 11C type modular jacks All the customer connections to the 2200LV are made through easily accessible connectors on the rear panel of the unit FLEXIBLE RANG
22. icates that a valid signal is being received at the 56 Kbps input port and that the unit is not in a local loopback condition The Carrier Detect CD signal asserted by the 2200LV means a valid signal is received by the 2200LV at its aggregate receive port and the unit may possible be in loopback mode The receive data LED on the front panel will light only when CD is asserted Each of the control leads to and from the DTE is a standard unbalanced RS 232C compatible signal 10 TEST MODES AND MAINTENANCE The 2200LV Voice Data Multiplexer provides a wide range of diagnostic capabilities for easing testing troubleshooting and maintenance Testing and diagnostic troubleshooting for the 2200LV consists of operation of the various loopback capabilities of the unit and observance of the LED indicators on the front of the unit to verify correct operation Additional more comprehensive testing can be performed with the use of transmission test sets for the voice channels and or BERT type data test sets for the data channels For most situations however the simple diagnostics resident within the 2200LV should be adequate Testing for the 2200LV is accomplished through the use of the two types of loopbacks available in the unit The two types of loopbacks used in the 2200LV are LOCAL and REMOTE By utilizing these various loopbacks a user at one end of a 56 Kbps digital connection can successfully test both the near 14 end 2200LV unit the far end u
23. n the REM position Again the LED next to the switch should light In this mode the near end 2200LV will transmit a special loopback code through its 56 Kbps aggregate to the far end unit Upon receipt of the special loopback by the far end unit the far end unit will provide a loopback towards the network and hence towards the testing end This loopback signal from the far end includes a special pattern used to assist in determining proper transmission through the system When both units and the transmission line are operating properly the near end unit will have its SYNC and SIG lights on This condition during the REMOTE LOOPBACK test indicates correct operation of both 2200LV units and of the 56 Kbps digital channel in between Verification tests can be run by sending BERT tests through the data channels Again this test will terminate automatically after two minutes if the LOOPBACK switch is left in the REM position If the REMOTE LOOPBACK test described above is not successful the problem is either in the remote 2200LV unit or in the 56 Kbps digital channel in between The LOCAL LOOBACK test can be performed on the far end unit to determine if that unit is functioning properly If the far end unit passes the LOCAL LOOPBACK test the problem is likely to be in the digital channel between the two locations By utilizing these two types of loopbacks the cause of a problem should be easily identified Should it be determined that a fault exist
24. nit and the digital circuit in between The first diagnostic of use in the 2200LV is the LOCAL LOOPBACK The LOCAL LOOPBACK is used to test the unit at the location where the test is being performed near end To perform the LOCAL LOOPBACK test place the LOOPBACK switch on the front of the unit in the LOC position The LED next to the switch should illuminate This indicates that the 56 Kbps output of the 2200LV is looped back to its receiver input During this test condition an all ones pattern is transmitted to the network When in LOCAL LOOPBACK observe the states of the SIG and SYNC LEDs If these LEDs are both lit proper operation of the local 2200LV is indicated While in local loopback mode the data channels can be tested with a BERT test set if desired The data transmitted on each of the two data ports will be received back on the same port Testing of the voice channels in LOCAL LOOPBACK is not possible since the channels are looped back upon themselves After completion of the LOCAL LOOPBACK test place the LOOPBACK switch back its normal center position The LED next to the switch should turn off Should the LOOPBACK switch remain in the LOC position the LOCAL LOOPBACK condition will be automatically terminated after two minutes and the LED will turn off indicating the test has ended To reestablish the loopback put the switch in the normal position then back to LOC To test the 2200LV at the far end place the LOOPBACK switch i
25. nnection to an outside telephone line off premise extension The 2200LV can also be used to support FAX or analog data transmission between two facilities or can support a point to point voice ringdown circuit hot line When used to connect a phone at a remote location to the PBX at the central location the 2200LV provides a means for the remote user to have an extension of the PBX equivalent to those on site The use of 16 Kbps Adaptive Differential Pulse Code Modulation ADPCM in the 2200LV provides for a high quality voice connection with minimum transmission delay The 2200LV contains all the equipment necessary for all voice and signalling applications including the generators of the ringing and talk battery signals The 2200LV can also be used in private point to point network applications see figures providing access over any derived 56 Kbps synchronous channel When used in a private point to point application the unit provides its own clock synchronization via the integral clock generator Master mode 4 INSPECTION AND INITIAL SELF TEST Upon receipt of the equipment visually inspect it for signs of damage Immediately report any damage to the transportation company and to the supplier Then perform the following quick and simple self tests 1 Before connecting any of the V 35 voice or data cables plug the male connector at the small end of the cord of the external wallmount transformer supplied with the unit into th
26. nt is accomplished by first setting the two DIP switches to their appropriate settings per Section 6 below and then connecting the data equipment to the 2200LV by connecting an RS 232C type cable with a 25 pin DB 25 connector to each of the two connectors marked RS 232C Data Channel A and Data Channel B located on the rear of the unit The voice equipment is connected by using a standard four or six wire modular cord to connect from the jacks marked Voice Channel A and Voice Channel B on the rear of the unit to the appropriate jacks of the telephone set PBX or outside line to which the 2200LV is to be connected The wiring plan of the modular jacks and of the DB 25 connectors follows the standard conventions The V 35 interface for the 56 Kbps aggregate signal is provided through a female 34 pin connector and follows the wiring convention for data terminal equipment DTE with the following pin connections Transmit Data TXDA TXDB Pins P amp S Transmit Clock TCA TCB Pins Y amp AA External Transmit Clock ETCA ETCB Pins U amp W Receive Data RXDA RXDB Pins R amp T Receive Clock RCA RCB Pins V amp X Request to Send RTS Pin C Data Terminal Ready DTR Pin H Signal Ground SGND Pin B Protective Ground PGND PinA The DB 25 connectors for the data connections follow the conventions for data communications equipment DCE and are wired as follows Transmit Data TxD Pin 2 Transmit Clock TC Pin 15 External Transmit Clk
27. o voice channels ports derived from the multiplexed 56 Kbps aggregate Each channel utilizes 16 Kbps Adaptive Differential Pulse Code Modulation ADPCM a method of voice compression approved by the major telephone companies as an acceptable means of reducing voice bandwidth On the transmit input side of the voice circuit the voice signals are received through a balanced line interface circuit which takes the two wire bi directional signal present on the telephone pair and converts the signal into separate transmit and receive audio signals The transmit voice signal is then amplified to produce the correct level and then passed through a bandpass filter The bandpass filter eliminates any high frequency components of the signal which cause interference with the analog to digital conversion process The resulting voice signal is then sampled at 8000 samples per second and converted to an eight bit digital representation of the samples This method of voice digitization called Pulse Code Modulation conforms with Bell System standards for the transmission of voice information throughout the network The digitized voice signal now represented in 64 Kbps digital form is then presented to the ADPCM digital signal processor for compression of the signal The resulting output is a 16 Kbps compressed voice digital signal which is then sent to the multiplexing circuit of the 2200LV for transmission over the aggregate to the companion 2200LV at the far en
28. ocker switch of the 2200LV Front Panel LEDs as seen left to right POWER When lit this LED indicates that power is applied to the 2200LV unit LOOPBACK Located next to the LOOPBACK switch this LED indicates that the 2200LV is in a loopback mode SIG When lit indicates a valid receive clock signal is being received by the 2200LV through the V 35 interface to the 56 Kbps channel SYNC When lit indicates the 2200LV receiver framing circuit is receiving a valid synchronizing signal from its companion unit at the far end and is properly aligned to the incoming multiplexed signal BUSY VOICE A When lit this LED indicates that a busy off hook condition is being received from the far end for the voice equipment connected to voice channel A This LED when not illuminated indicates the far end voice equipment is idle on hook BUSY VOICE B Same as above for voice channel B XMT DATA A When lit this LED indicates that the 2200LV is receiving a SPACE on its transmit data input pin 2 from the DTE for Data Channel A AND the Data Terminal Ready lead DTR pin 20 for that channel is asserted When not lit this LED indicates that the 2200 is receiving a MARK from the DTE on its transmit data pin OR the DTR lead from the DTE is not asserted RCV DATA A When lit this LED indicates the 2200LV is sending a SPACE on its receive data output pin 3 to the DTE AND Carrier Detect CD pin 8 is asserted by the 2200 to the DTE
29. panion 2200LV located at the far end of the circuit should also be optioned as PLAR and should have a telephone set attached to its port When either telephone goes off hook the telephone at the far end will ring This provides a point to point hot line circuit between the facilities at the two ends of the telephone line When OFF PLAR mode is not selected for Voice Channel A S1 4 When ON FXS mode is selected for Voice Channel B When OFF FXS mode is not selected for Voice Channel B 1 5 When ON FXO mode is selected for Voice Channel B When OFF FXO mode is not selected for Voice Channel B S1 6 When ON PLAR mode is selected for Voice Channel B When OFF PLAR mode is not selected for Voice Channel B S1 7 Not Used S1 8 When ON up this switch position selects ASYNC data operation for Data Channel A When OFF down this switch position selects SYNC data operation for Data Channel A S1 9 When ON this switch position selects ASYNC data operation for Data Channel B When OFF this switch position selects SYNC data operation for Data Channel B S1 10 When ON this switch position selects MASTER timing mode for the 56 Kbps V 35interface Use master mode at one end when the 2200LV is used over a local channel derived through V 35 cabling or through limited distance modems In this mode the 2200LV derives its transmit timing from its own internal clock source which is passed through to the other end 2200LV unit over the Extern
30. power consumption and compact size This maximizes reliability and minimizes the need for spares FRONT PANEL LED S CONTROL The front panel holds 10 LED S and one LOOPBACK switch for quick identification of all status conditions and convenient selection of test modes COMPACT SIZE The unit is physically compact light and is contained in a housing made of durable plastic designed to sit on a desktop or in an equipment room The 2200LV will operate in a broad range of environmental conditions and requires minimal space and no special power or cooling Power for the 2200LV is derived from a standard AC outlet EASY INSTALLATION The 2200LV is designed for easy installation and operation No trained personnel are needed to install or activate the unit All connections are of a plug in connectorized type and are made on the rear of the unit The unit is optioned via two DIP switches located on the rear panel No alignments or adjustments are required LOW POWER CONSUMPTION The unit has a low power consumption and uses an external wallmount power supply Supplied with unit which plugs into a standard 120 V 60 HZ grounded outlet Due to the low power consumption of the 2200LV the unit has no cooling fans or moving parts further enhancing reliability TWO YEAR WARRANTY The 2200LV Voice Data Multiplexer has a two year limited warranty which covers all parts and labor Should service or repair be necessary contact DC
31. s in one of the 2200LV units it should be replaced The units are not field repairable and should be returned to DCB for repair if necessary If technical assistance is required contact the DCB Customer Service Department by calling 708 241 0909 15 11 DCB CORPORATION LIMITED WARRANTY DCB Corporation warrants this product against defects in material or workmanship under normal operating conditions for a period of 2 two years from the date of purchase This warranty covers the product during the warranty period when in the possession of the original purchaser only In the event service is required the product must be delivered within the warranty period prior authorization required transportation prepaid to DCB CORP together with evidence of date and place of original owner s purchase You will be responsible for removal and installation of the product In all cases the DCB warranty is limited to the repair or replacement of defective units LIMITATION OF WARRANTY DCB will repair or replace at no charge units found to be defective during the two year warranty period Failures attributable to improper use storage or maintenance of the product are not covered by this warranty DCB s liability is limited to the repair or replacement of defective units This warranty shall not apply to manuals or accessories DCB CORPORATION AND ITS REPRESENTATIVES OR ITS AGENTS SHALL IN NO EVENT BE LIABLE FOR ANY GENERAL INDIRECT OR CONSEQUENTIAL DA
32. s mode Channel A Data Channel B is not operative Transmission of synchronous data and asynchronous data is handled differently by the 2200LV A description of each is given below SYNC DATA When configured for sync data the 2200LV data ports act as an end to end pipeline for the data independent of format or protocol In sync mode data is exchanged with the DTE in accordance with clocks normally provided by the 2200LV and derived synchronously from the 56 Kbps aggregate output Specifically RS 232C data is received by the 2200LV on Pin 2 of the DB 25 connector and is sent to an elastic storage buffer of 32 bits size This data is loaded into the elastic store buffer either in accordance with the Transmit Clock TC provided from the 2200LV to the DTE or in accordance with External Transmit Clock ETC provided by the DTE to the 2200LV This selection is made with a DIP switch option as discussed previously When ETC is chosen for the transmit data it should be noted that the DTE clock must be synchronous with the clock provided by the 2200LV as Receive Clock RC to avoid clock slips No clock slips can occur when TC is used as the transmit data timing source After the elastic store buffer data is presented to the multiplexer circuit of the 2200LV for transmission over the 56 Kbps aggregate output The bandwidth of the aggregate dedicated for each of the two data channels is exactly 9600 bits per second For this reason selection of 19 2
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