Data-Link Modem
Contents
1. 1 3 Calling modes dialing The modem can be in 2 modes Send or calling Receive or answer 1 3 1 Calling Mode The modem switches to originate mode when the dial command ATD 37487126 is sent example number The calling modem then waits for the remote modem to respond 1 3 2 Answering Mode The modem switches to answer mode when it detects ringing on the phone line The answer is carried out automatically if the command ATSO 2 was sent to the modem by the local PC A training sequence is then initiated A training sequence is the hand shake sequence between modems to establish a communication link It establishes speed modes 1 4 Leased line A leased line is a permanent communication link dedicated between two modems This kind of link is used for e High usage e Secure communications e Privately managed networks The leased line can be a e 4 Wire type where there is 1 transmit pair 1 receive pair e 2 Wi e where SALES 0118 965 5100 6 lt gt Data Link Modem the same pair of wires is used for transmit amp receive For a leased line a modem is designated e Originating modem ORIGINATE or MASTER e The other as the answering modem ANSWER or SLAVE Modems in leased line mode always try to connect when power is on in order to provide permanent a link The MDU903 4 modem can establish leased line connections in the following speeds V22 1200 bps V22bis 2400 bps V32 9600 bps 4802. FTS Stop transmission and wait FRS Receive silence FTM Transmit mode FRM Receive mode FTH Transmit T30 command mode FRH Receive T30 command mode FCERROR Error code The following AT commands control the operation of a class 2 modem fax FCLASS Service class identification and control FMDL Fax modem model FMFR Fax modem manufacturer FREV Fax modem checkup FBUG Frame report FAA Automatic answer FBOR Data bit order FDCC Fax modem capability selection FDIS Capability initialization for transmission FLID Identification selection of the fax modem FCON Remote fax detection FCIG Identification of called subscriber by CIG FCSI Identification of called subscriber by CSI FTSI Identification of calling subscriber by TSI FDTC Called fax return capability DCS frame FDCS Discussed capability for process DCS frame FHR Content of received frame FHT Content of transmitted frame FBUF Buffer state FDT Fax message transmission 53 lt SALES 0118 965 5100 Data Link Modem FPTS Page transmission result FDR Fax message reception FCFR Reception mode confirmation FPTS Remote reception status FET End of page status FHNG End of procedure status FAXERR Error code 5 5 General characteristics Dimensions Length 260 mm Width 170 mm Height 35 mm Weight 0 7kg External power supply module 230V 50Hz Power consumption 25mA Operating temperature 0 to 50 C Relative humid
3. EAS The Source for Connectivity NA y XN BLACK BOX Catalogue Ltd 11111111110 ss mm MDU903 MDU904 RMU903 MDU903C Data Link Modem TECHNICAL SALES FAX ADDRESS WEB 0118 931 2233 0118 965 5100 0118 931 1727 15 Cradock Road Reading Berkshire RG2 0JT www blackbox co uk Data Link Modem E Notice No part of this document may be reproduced transmitted copied out or translated without prior written consent of BLACK BOX SA All rights reserved Copyright 1997 BLACK BOX June 97 E o ccc ooo o Foreword This document describes how to set up the BLACK BOX MDU903 4 modem e Chapter 1 is to familiarize the user with the operation of a modem e Chapter 2 describes the installation e Chapter 3 describes the most common uses of a modem e Chapter 4 explains the operation of the modem security features and memories e Chapter 5 provides technical characteristics e Chapter 6 indicates how to solve operation problems E o ooo o Note to the reader Users who are not familiar with the MDU903 4 modem operation should read the first three chapters Advanced users can refer directly to chapter 4 to use the advanced functions of the modem Whenever a problem arises refer to chapter 6 A E Product range The MDU903 4 modem has various options e Dial up e Leased line e Group III fax e Stand alone or rack e LCD front panel These different versions are summed up in the foll
4. 33237 4 to validate 33237 1 PO3 LINK J to get next field NONE PO3 CONFIG W to get next field NONE PO3 to edit attribute field ATTRIBUTE NONE 14 PO3 NONE to validate this choice Note the attribute on pu AUTO CALL gt the first line ON 5 PO3 A J to display next attribute DIAL OUT gt ON PO3 A J 4 times to pass other PASSWD ACCS gt ON attributes and display next menu 17 SAVE MEMORY to save these changes in permanent memory or lt to ignore and return to configuration menu step 2 without saving memory na 2 6 Dialogue For your first dialogue with your modem install communication software on your micro computer Your MDU903 4 modem will recognize automatically the communication speed and format of your computer up to 115200 bps as soon as you enter the following characters amp AT lt CR gt Carriage return El Answer OK amp AT amp S lt CR gt Answer Displays configuration pages Identification model Once this first dialogue is established the reference manual will help you to perform complete operation of your modem TECHNICAL 0118 931 2233 lt y 15 Data Link Modem 3 Configurations This chapter describes commonly used configurations through the AT command set These commands may be used as part of software drivers for example The same configuration can be achieved through the LCD and keypad front panel R
5. Security and memory 4 2 Principles The modem contains three types of memory The PROM where factory configuration is stored permanently The RAM where the modem configurations are stored temporary The NVRAM where semi permanent data is stored even when the modem is turned off The first time your modem is turned on or after a complete reset these three memories are identical and set to the default factory configuration The AT amp Wn command saves the current configuration in the non volatile memory n 0 to 4 The last stored user configuration will be loaded automatically on next power up These memory operations are shown on the following diagram Factory configuration Stored configuration AT amp W255 Memory reset AT amp W255 Memory store AT amp WO0O to AT amp W4 Loading of a factory configuration without loosing the stored AT amp FO to AT amp F4 memory Loading the user configuration AT m0 to AT m4 4 2 The phone directory Up to 100 phone numbers can be stored in the modem s non volatile memory to be used by the automatic dialer This command saves automatically the directory in non volatile memory ATDSO lt CR gt Display the directory AT amp N lt CR gt 18 lt SALES 0118 965 5100 Data Link Modem 4 3 Answerback security This security mode is controlled by the answering modem and depends on a password exchange which authorizes a modem connection i e ATDxxx 0 Tra
6. number editing sub menus to edit the NAME field three times to displays C character Then leave J pressed until you get a C again to validate this first character the cursor moves on the right Press J to get the X then 4 then J to get the R then 4 no character is displayed on the cursor ENTER key validates this field and initiate next field editing Just like steps 5 to 8 press PO3 NAME PO3 NAME c PO3 NAME PO3 PASSWORD once to start editing l to get F then J F J to get O then J l to get X then J FOX 4 to validate FOX as the 7 lt SALES 0118 965 5100 XZ FO 00 already exists in this example Look at the name on line 1 an the number on the second line J would access to the PASSWORD next field Note that the symbol is gone Note the cursor position validate a field on a blank cursor Data Link Modem Press the key Comments password and access to the ae next field of this number PO3 NUMBER Again like previous steps Note that dialable press digits are available once to start editing as well as control 4 to get 3 then J 3 character Refer to the dial command ATD in the reference manual S y to get 3 then J 33 y to get 2 then J 332 y to get 3 then J 3323 y to get 7 then J
7. 0 bps V32bis 14400 bps 12000 bps V32terbo 19200 bps 16800 bps V34 33600 bps down to 2400 per steps of 2400 bps In case of failure on the leased line the MDU903 4 modem performs automatic switch over to the dial up PSTN It then monitors the leased line until it finds a connection has been re established 1 5 Protocols Two types of protocols can be used to improve communication performance between two modems e Error correction MNP4 or V42 detect errors which occurred during data transmission and either correct them or re transmit the data e Data compression MNP5 or V42bis compress the data and thus transmit at a higher effective speed These two types of protocols improve efficiency and reliability of a connection 1 5 Memory Beyond these basic principles the modem offers other functions aimed at improving performance and ease of use These functions are controlled via the memory S Registers of the modem and are available via the extended AT command set These functions are described in chapter 4 of this manual Some of the extra functions are e Storage of phone numbers e Forced V24 signals e Exchange of a password between two modems Answer Back e Pre qualification of the telephone line TECHNICAL 0118 931 2233 lt Y 7 Data Link Modem 2 Installation 2 1 Stand alone version Package Contents Before installing your modem check all these items are present e One MDU903 4
8. ated on the right of the gt symbol ON gt OFF l DOWN This key displays next item of the menu i e next menu or parameter or value according to the following examples Case 1 SELECT STORE Displays next menu CONFIGURATIO CONFIGURATION N Case 2 COMMAND QUIET Displays next ECHO OFF CHANGE Parameter ON CHANGE Case 3 COMMAND Y COMMAND ECHO Displays next value ECHO ON gt OFF of the parameter ON gt ON lt LEFT This key comes back one step to the previous menu according to the following examples Case 1 CHANGE E MDU903 4 Comes back to main MODEM OPTION REV 5 01 menu Case 2 COMMAND CHANGE Comes back to ECHO VISUAL DISPLAY configuration menu ON CHANGE Case 3 COMMAND COMMAND ECHO ee ECHO ON CHANGE inchanged ON gt OFF From the main menu LEFT lt key is a multiple action key depending on the modem configuration and connection status e During training left key aborts the connection and restores command mode In on line mode left key disconnects e In idle mode if the modem is configured in leased line mode left key initiates a leased line training e In idle mode when incoming rings are detected left key initiates answer mode acts as an ATA command e In idle mode when the modem is configured in dial up mode i e not in leased line mode left key initiates a calling mode connection The modem dials the first automatic number found in the phone book or ju
9. dix B Country specific informations UK Although this equipment can use either loop disconnect or DTMF signalling only the performance of the DTMF signalling is subject to regulatory requirements for correct operation It is therefore strongly recommended that the equipment is set to use DTMF signalling for access to public or private emergency services DTMF signalling also provides faster call set up TECHNICAL 0118 931 2233 lt lt SY 27 Data Link Modem 28 lt gt SALES 0118 965 5100
10. efer to the LCD menu diagram provided in chapter 2 5 3 1 Factory configuration This configuration applies when the modem is first powered on or after complete reset by the following commands amp AT amp W255 lt CR gt Answer OK amp ATZ lt CR gt Answer OK This configuration is designed for most common applications and has the following characteristics DTE V24 Normal CD DTR DSR activated on handshake CTS controlled by DTR in command mode and RTS in on line mode Automatic answer S0 2 Automatic hunt V34 V32bis V32 V22bis V21 and V23 modes Error correction and data compression V42bis and MNP automatic mode S0 Flow control RTS CTS This configuration can be modified for a specific application The following examples describe the most common applications 3 2 Flow control Flow control can either be performed physically using the RTS CTS signals or via software using the Xon Xoff protocol The following table shows how to activate each form of flow control Xon Xoff amp AT LG1 lt CR gt amp AT LR1 lt CR gt amp or AT amp K4 lt CR gt Or RTS CTS amp AT C1 lt CR gt amp AT amp R1 lt CR gt amp AT LG2 lt CR gt amp AT LR2 lt CR gt amp or AT amp K3 lt CR gt 3 3 Synchronous mode Synchronous mode is when the DTE provides a clock to which the data being transmitted or received must be synchronized It provides a more efficient means of data transmissions a
11. es that the user must press the return key after a command sequence 1 1 The modem A moden is a device that allows two terminals DTE PC to communicate via a telecommunication line phone line The data is converted by the modem into electrical signals adapted to the telecommunication network This conversion is called modulation and demodulation Various conversion techniques have been developed to speed up the data flow The different speeds are particular to each type of modulation 300 bps in V21 2400 bps in V22bis 14400 bps in V32bis 19200 bps in V32terbo and 33600 bps in V34 1 2 The modem fax A fax device transmits scanned images via the telephone network In addition to traditional fax machines the fax modem also allows transfer of computer data such as e ASCII files from a text processor e PCX or TIF files from a graphic editor etc The Fax mode operation is controlled by a fax software which e Converts files to T4 format fax graphic format e Transmits and receives faxes e Supervises fax modem operation Supervision of the fax modem is carried out by a standard protocol Asynchronous Facsimile DCE Control Standard Class 1 Service TR 29 2188 or Class 2 Service TR 29 2388 The computer equipped with a fax modem will be able to transmit and receive fax in Group III mode e At about one A4 page per minute e In fine or standard resolution See chapter 5 for the list of modem class 1 and 2 commands
12. fied by n where n is 0 to 99 e By CCITT 108 1 operation The modem autodials a stored number when an off to on transition of the DTR occurs The modem disconnects when an on to off transition of the DTR occurs AT amp D1 command select the dialing mode of the DTR signal 3 5 Leased line As mentioned before a leased line is a permanent analogue telephone connection between 2 sites Therefore there is no dialing necessary Depending on the selected configuration the following commands are sent to the modem See reference manual for a description of these commands Configuration Originating modem 2 wire line AT8L1 018W lt CR gt AT8L1 008W lt CR gt 4 wire line AT8L2 018W lt CR gt AT amp L2 00 amp W lt CR gt Dial back up AT U1 AT U1 1234 back up dial number AT8Z 1234 A lt CR gt Recovery lookback AT L1 amp W lt CR gt AT L1 amp W lt CR gt after this leased line configuration is saved by the AT amp W command the modem will start training on leased line if e itis reset by ATZ or by a power restart e the front panl button is pressed 3 6 Saving user configurations The MDU903 4 modem can store up to 5 user configurations The AT amp Wn command saves the current configuration in non volatile memory n 0 to 4 This configuration is saved even when the modem is turned off The modem will load the last saved user configuration at power up TECHNICAL 0118 931 2233 lt SY 17 Data Link Modem 4
13. ge e A busy line When the modem is set in answer mode it will go off hook after 2 rings if the command ATSO 2 is sent This is in conformity with CCITT V25bis recommendation In calling mode the modem will automatically recognize the remote modem modulation type and adapt correspondingly It will disconnect only if e The carrier is lost e No carrier tone is detected within 35 to 90 seconds e No data activity has occurred for the selected period of time dictated by the Inactivity Timer TECHNICAL 0118 931 2233 lt y 21 Data Link Modem 5 3 Serial interface The V24 serial interface of the modem conforms to the DCE specifications A straight ribbon cable is all that is needed to connect to the DTE port of your computer or terminal The serial port will automatically recognize DTE speeds up to 115200 bps This is called auto bauding Both asynchronous and synchronous modes with internal or external clock are supported 5 4 Fax mode See 5 2 The modem provides the ability to send and receive faxes at speeds up to 9600 bps The following modulations are supported ITU T Speed Bps Carrier Hz 1650 1850 2400 4800 1800 7200 9600 1700 In fax mode the modem support the following standards e Group III Fax EIA 578 class 1 and class 2 compatible e CCITT T4 T30 recommendations The following AT commands control the operation of a class 1 modem fax FCLASS Service class identification and control
14. ini ring _ __ ENQ 0 AC24Y __ AC24Y for example control process If the answerback matches the one stored in memory within two seconds after an ENQ code was sent by the answering modem access is granted Otherwise the modem disconnects automatically To store the answerback code see the following example The password can be up to 12 characters long Store answerback for example AC24Y AT amp A AC24Y AC24Y lt CR gt To disable answerback security AT amp A lt CR gt 4 4 Callback security This security mode is controlled by the answering modem It sends a password and then calls back the telephone number associated with that passsword See SA and SB commands in the reference manual HERE THERE N 3132 N 4142 ATS0 2 ATS0 2 AT SB1 AT SA1 AT8Z3 HERE CALLB1 3132 CD ATD4142 Calling Training Password call B1 Disconnecting Calling 3132 Training Password Call B1 Modems are connected or The double security guarantees password and localization of the calling modem TECHNICAL 0118 931 2233 lt lt V 19 Data Link Modem 4 5 Inactivity password The modem asks for a password when no data passes through it for a presented delay If this password matches the operator or supervisor password stored in memory then the modem will reconnect otherwise it will drop the line 32 number of minutes of inactivity that will start the password request S96 number of seconds
15. ion sequences N is set by the S20 register This maybe due to a bad connection to the telephone line This option is particularly useful for line pooling applications and in case of fault incoming calls are switched to another modem in the pool Installation See rack operation manual to install your modem Find an empty location in the rack and insert the MDU903C Card into its card guide Connection Connect your modem from the rear of the rack according to the following diagram Power On Inserting the modem card connects it to the power supply of the rack Power on is carried out by the power switch located at the rear of the rack TECHNICAL 0118 931 2233 lt Data Link Modem 2 3 Power up self test When the modem is turned on an automatic self test is performed which tests e lts program memory e lts data memory e Its stored memory e Its data processing unit The test lasts a few seconds and ends with a series of e Different tones if the test is ok e The same tone if a failure is detected This failure is stored in the S19 register or detailed by the ATi7 command See chapter 6 Troubleshooting The self test result is displayed on the front panel LCD of the modem 2 4 Operating modes This chapter describes the operation of the Data Link modem The modem can operate in one of the four following modes 1 IDLE MODE The modem enters the idle
16. ity 0 gt 90 non condensing Conforms to European security standards EN41003 EN60950 Conforms to European Electromagnetic Standards EN50082 EN55022 TECHNICAL 0118 931 2233 lt lt V 23 Data Link Modem 6 Troubleshooting Problem This chapter lists most modem operating problems Problem No tone when modem is turned on Single and continuous tone when modem is turned on Modem does not obey commands Modem answers NO DIAL TONE Modem refuses to dial Connection to the mains On Off switch in On position Power supply of the rack and fuse of the card rack version DTR indicator on or flashing Send commands AT amp W255 lt CR gt ATZ lt CR gt Then restart the modem to see if the same continuous tone is heard See S19 section below Flashing of the TXD indicator when sending characters No flash check V24 cable Flashes lt CR gt command AT amp S4 lt CR gt and check for a long flash of TXD indicator Long flash check V24 cable Try to dial an outside line using the ADT command Make sure that you select a valid telephone number and dialing mode P Pulse T Tone Listen to the internal speaker to see if the normal dial tone is heard If not then it is a problem with the line connection Check for any blacklisting AT amp NB lt CR gt see reference manual Turning the modem off and on resets the blacklist ATI7 command Check the answer to the ATI7 command It provides a clear
17. l lights and operation of the LCD and keypad Function DSR Ri 107 125 Flashes when an incoming ring is receiving 125 Ri Flashes during training on leased line ON when DSR is activated when the modem is off hook and when connected CD 109 Indicates that the modem is connected to the remote one i e remote carrier is detected DATA 103 104 Flashes as data are received and transmitted by the modem DTR Indicates that the data terminal equipment connected to the modem is ready for data communication The LCD displays two lines of 16 characters It displays results of the self test after power on The main menu displays successively states of the modem connection speed DTE interface statuses and branches to configuration and dialing sub menues Theses menus are described on the next double page diagram Three keys are used to pass between menues down J key accesses next item in a list enter key validates a choice or branches to a sub menu and left lt key comes back one step to the main menu with no effect on last choice m lt SALES 0118 965 5100 Data Link Modem ENTER This key validates the displayed choice or option according to the following examples Case 1 PRESS ENTER Enter branches to the configuration sub menus Case 2 CHANGE Enter branches to the AT display parameter sub VISUAL menus DISPLAY Case 3 COMMAND Enter selects the new value of the parameter ECHO loc
18. message in case of self detected problem ATI7 Response BAD ROM BAD RAM BAD NOW VOLATILE MEMORY BAD DSP ROM BAD DSP ALB FAILED Code EPROM checksum bad Write and read failure in RAM No volatile memory checksum bad DSP checksum bad DSP bad Analog loopback test bad If a problem persists after these verifications contact the BLACK BOX Hot Line service HOTLINE 44 118 931 2233 gt lt SALES 0118 965 5100 7 Appendix A V24 Signals Pin number Name CCITT number moo for Earthprotection o 2 TXD 103 Data transmission XD T Data reception 3 s Jers poe oemwsni 6 SR e pata terminal ready o jeje eaea OOOO le CD 108 Carrierdetect 15 SCT 114 Time basis for signal elements at transmission Source ETCD 21 DB 140__ Test command remote control ofloop2 2 h fe Ring indicator 113 Time basis for signal elements transmission Source ETTD 25 TEST Test indicator CABLE DB9 DB25 PC MODEM Dial line connector Pm Signal 2 Telset Tip SEERE jo Notused TECHNICAL 0118 931 2233 lt y 25 Data Link Modem CBL903 UK Dialup cable for use in the UK Signal Pin Line BT631A 2 Telset Tip NIC 3 TipPSTN 2 4 RimgPSTN 5 pS TelsetRing NIC 6 Notused NIC Leased line connector Pin Signal 2W Signal 4W 123456 5 Not used Receive ring 6 Notused___ Notused__ 26 lt gt SALES 0118 965 5100 Data Link Modem 8 Appen
19. mode after powering up if it passes its power up self test Beeps announcing the end of the test can be heard unless the speaker is turned off see corresponding command From this mode the modem will enter in command mode by receiving a command from the DTE or in ONLINE mode if an automatic call is initiated from the front panel or if a call is received when the modem is configured to answer calls 2 COMMAND MODE e The modem enters the command mode when it receives a recognized command In this mode commands are interpreted and executed Configuration set up automatic call request The modem also enters in command mode when it recognizes an escape sequence in the data when in an on line rude 3 ONLINE MODE e The on line mode starts when detecting a carrier signal from a remote modem 4 TEST e The test mode is selected when in a command mode using appropriate test commands The front panel of the modem has six red LEDs and one push button The different LEDs indicate the state of the modem and the status of the self test sequence DTR DSR RI CD TXD RXD LINE MODE O O O 108 125 107 109 103 104 0 lt SALES 0118 965 5100 Data Link Modem The following table list these functions LED Circuit Function DTR Data 108 Indicates that the data terminal equipment connected to the Tain modem is ready for data communication also bad Ram Ready during power up test DSR RI Data 107 125 Flashes when an i
20. modem e One RJ11 phone cable e Power supply or 48V cable for SPC version e Leased line RJ 11 cable except for STV and FTV versions e AT and V25bis command reference manual e User manual e Software as an option Connections Connect your modem as shown on the following diagram Power On When the modem is connected switch the power switch to the On position Power supply DC adaptator or Power supply cable 2 2 Rackmount version Package Contents Before installing your modem check all these items are present e One MDU903C Card e One RJ11 phone cable e A leased line RJ 11 cable e AT command set reference manual e User manual e Software as an option Rack Controller Option If your rack is equipped with a controller card for modem supervision the control card interface is located at the U10 position of the MDU903C Card see following diagram lt SALES 0118 965 5100 Data Link Modem Sra T E 1111 Anote i I te w cas AOT A a Blan ont OL y ITOO Omg ee AINNI If the U10 position is empty your MDU903C Card will not be recognized by the rack controller If you ordered the busy out function check that the K3 option is available This function forces the line to be active when there is e A faulty power supply e No answer to a call after N rings N is set by the S20 register This maybe due to a non connected data terminal DTR 108 absent e N successive ineffective connect
21. n 8 2 1 Stand alone version 8 2 2 Rackmount version 8 2 3 Power up self test 10 2 4 Operating modes 10 2 4 1 Operating modes 10 2 4 2 The Front Panel 10 2 4 3 The Push Button 11 2 4 4 Configuration Select 11 2 5 Configuration through front panel LCD and keypad 12 2 5 1 The four LEDs indicate the state of the modem 12 2 5 2 LCD displays 12 2 5 3 Three keys operation 13 2 5 4 Example 14 2 6 Dialogue 15 3 Configurations 16 3 1 Factory configuration 16 3 2 Flow control 16 3 3 Synchronous mode 16 3 4 Automatic dialing directory 17 3 5 Leased line 17 3 6 Saving user configurations 17 4 Security and memory 18 4 1 Principles 18 4 2 The phone directory 18 4 3 Answerback security 19 4 4 Callback security 19 4 5 Inactivity password 20 5 Specifications 21 5 1 Line side characteristics 21 5 2 Automatic call amp answer 21 5 2 1 Originating 21 5 2 2 Answering a Call 21 5 2 3 Connection Disconnection 21 5 3 Serial interface 22 5 4 Fax mode 22 5 4 1 Automatic Call and Answer 22 5 4 2 Transmission Modes 22 5 4 3 Operating Mode 22 5 4 4 Service Class 1 Command Set 22 5 4 5 Service Class 2 Command Set 22 5 5 General characteristics 23 6 Troubleshooting 24 7 Appendix A V24 signals 25 8 Appendix B Country specific informations 27 TECHNICAL 0118 931 2233 lt GY 5 Data Link Modem 1 Introduction This chapter is to familiarize the user with the operation of a modem Note lt CR gt indicat
22. n answer mode The length of this push is signaled by two flashes of the DSR LED e If the button is pressed for more than 10 seconds three flashes of the DSR LED the modem resets IN ON LINE MODE e Pressing the button once disconnects the modem and selects idle mode again Holding MODE for more than 10 seconds will initiate a hardware reset If the switch is still pressed after some beeps are heard the modem will enter configuration mode The front panel LEDs DTR DSR CD and LINE indicate which configuration the user can select There are listed in the following table e 7 A User configuration 1 AT M1 User configuration 4 ern Factory configuration 0 async dial configuration AT amp FO Factory configuration 1 sync 2WLL configuration originate AT amp F1 Factory configuration 2 sync 2WLL configuration answer AT amp F2 Factory configuration 3 V25bis HDLC dialer AT amp F3 Factory configuration 4 V25bis BSC dialer AT amp F4 TECHNICAL 0118 931 2233 lt V 11 Data Link Modem Each of the configuration will stay on for 2 seconds while the MODE button is pressed Releasing the button will select the new configuration and this configuration will be loaded after power up Immediately after the power up test after the beeps the LEDs will indicate which configuration is loaded for 2 seconds 2 5 Configuration through front panel LCD and keypad This chapter describes states of the front pane
23. ncoming ring is received 125 Rl Remains Set Ready Ring lighted permanently when connecting Also bad RAM causes Indicator flashing of light during power up test CD Carrier Indicates that the remote modem s carrier signal has been Detect received by the modem In test mode this light will flash if the test is negative Also flashes if bad ram during power up test TXD Transmit Flashes as data is transmitted by the modem Data RXD Receive Flashes as data is received by the modem Data Indicates the mode of connection Permanent Leased Line Flashing PSTN Off Command Mode Equally a sign of bad non volatile RAM during power up test PSTN Off 300 bps Flash 1 Time 1200 bps Flash 2 Times 2400 bps Flash 3 Times 4800 bps Flash 4 Times 7200 bps Flash 5 Times 9600 bps Flash 6 Times 12200 bps Flash 7 Times 14400 bps Flash 8 Times 16800 bps Flash 9 Times 19200 bps Flash 10 Times 21600 bps Flash 11 Times 2400 bps Flash 12 Times 26400 bps Flash 13 Times 28800 bps Flash 14 Times 31200 bps Lighted permanent 33600 bps The MODE push button programs different functions depending on the current mode IN COMMAND MODE e Performs automatic dialing of the number stored in memory or holds the line in originate mode if no number was stored or starts answering if rings were detected on the line The length of the press is signaled by a single flash of the DSR LED e A two second push holds the line i
24. owing table The names in the first column will be used throughout the manual to indicate when these options apply TECHNICAL 0118 931 2233 lt GF 3 Data Link Modem LCD version Stand alone version Rackmount version co e Leased Line e RACK RMU903 Power supply 5V adaptator 230VAc i Versions Data Link Industrial Options Data Link p MDU903 4 features The MDU903 4 is a modem for the professional user It encompasses a number of features that place it above the rest It includes features such as e Configuration through front panel LCD and key pad for synchronous application the MDU903 904 can be fully set up from its user friendly front panel e Busy Out Whenever modems are pooled a faulty modem will lock up the rest The busy out standard in the BLACK BOX modems lets the PBX pass onto the next modem without upsetting the system e Line Quality Testing The modem can test a line at every call If it finds it below standard it will hang up and retry up to 5 times transparently to the user This guarantees that you have the most reliable connection every time on any type of infrastructure e BERT The modem can perform simple Bit Error Rate Tests between two BLACK BOX modems to qualify the digital transmission of data e ITU V 13 Half duplex operation e 10 User Configurations e UnAttended Automatic Dial Backup If ever your Leased Line fails the MDU903 4 will back u
25. p onto the dial up network Not only that it will continue to monitor the Leased Line until it is operational and switch back automatically This is called Intelligent LookBack e Password Security To change configuration of the modem 2 levels of password security are provided User amp Supervisor e Connection Security 4 levels of security are provided Answerback i e where the far modem asks the calling modem for a password transparently to the user Pass Through Access i e where the far modem asks the user for a password Automatic Modem Password Access i e same as before but for synchronous operation Call back i e the far modem asks for a password from the calling modem and hangs up The far modem associates a telephone number with the password and calls back the original calling modem e 5 different Statuses Modem Configuration Line e g Xmit Reve levels signal quality etc Line Error Statistics e g for MNP or V42 the number of bad characters bytes frames etc Leased Line Statistics e g connection amp idle time etc Dial Up Statistics e g same as leased line with directory information etc This is but a short list For full details consult the Command Set Manual 4 lt SALES 0118 965 5100 Data Link Modem E ooo Contents 1 Introduction 6 1 1 The modem 6 1 2 The modem fax 6 1 3 Calling modes dialing 6 1 4 Leased line 6 1 5 Protocols 7 1 6 Memory 7 2 Installatio
26. s longer pockets of data can be strung together The following table shows how to enable this feature amp AT MO lt CR gt amp AT amp M1 lt CR gt amp AT amp X1 lt CR gt t ATOVO lt CR gt If the synchronization clock is provided by the DTE send the command AT amp X1 lt CR gt If the DTE transmits a continuous flow of data it is recommended to disable the COMMAND mode of the modem to prevent escape characters from appearing in the course of data transmission or constant polling To do this send the command ATOVO lt CR gt a lt gt SALES 0118 965 5100 Data Link Modem 3 4 Automatic dialing directory The MDU903 4 has a non volatile memory that allows the user to store frequently used numbers Each phone number can have a name and control sequence associated So instead of remembering every number the user can type in the recipient name thus greatly easing the task of making a connection The following example shows how to store a number name and control sequence at location 3 of the directory memory Dialing a direct line send the command amp ATDT36062424 lt CR gt Dialing via a PABX send the command tm ATDPOW36062424 lt CR gt Storing a number in the directory number 3 send the command amp AT amp Z3 NAME CONTROL POW36062424 A lt CR gt Show directory contents send the command m ATEN lt CR gt Dialing from the directory e The ATDSn command dials the stored telephone number speci
27. st hangs up in calling mode if any acts as an ATDS or ATD e In leased line mode with dial backup option set during training on lease line left key initiates dial backup During dial backup with alarm beep left key stops beeping e During dial backup without alarm beep left keep aborts the dial line connection and starts training on leased line TECHNICAL 0118 931 2233 lt lt y 13 Data Link Modem Example How to store a phone number in the phone book as would this AT command AT amp Z3 BLACKBOX FOX 33237 A Number 3 in the phone book range 0 to 99 BLACKBOX is the name field FOX is the password field LINK and CONGURATION fields are both left blank A attributes means this number is dialed from the front panel or from the DTE interface DTR 108 1 NOTA Please refer to the AT command reference manual for more details on the phone book fields and usage see AT commands amp N amp Z DS While editing the number the modem keeps modification in its memory e You may stop editing and restart later e This memory is not saved modification will be lost in case of reset by ATZ command or power lost e To save memory and make modification permanent you must validate the last menu of the number editing PRESS ENTER TO SAVE NUMBER MEMORY On display Press the key J to access configuration menus then J to display CHANGE PHONE NUMBERS J to access phone
28. that the modem will wait for the password AT ST 0 1 number of password trials 0 one trial 1 three trials AT ln inactivity is detected if n 0 no detection i e feature is disabled n 1 detects transmitted data inactivity n 2 detects received data inactivity n 3 detects both received and transmitted data inactivities AT PS SUPER SUPER stores the supervisor password SUPER as an example AT PO OPE OPE stores the operator password OPE as an example 2 lt gt SALES 0118 965 5100 Data Link Modem 5 Specifications 5 1 Line side characteristics Moe Switched network 2 wire leased line 4 wire leased line Receiver sensitivity 43 dBm 33 dBm 26 dBm Carrier detection Open threshold Close threshold Transmission level Nominal Maximum Minimum Recom Call Answer Speed Bps Received Received mendations 0 1 Answer 2400 2400 2400 1200 1200 Answer teo 2400 2400 i200 fiz00 V21 Call 300 1180 980 1850 1650 Answer 300 1850 1650 1180 980 Answer teo 2100 i300 450 390 vaz 9600 teo0oH gt v32bis 14400 te00H v32terbo 19200 1800 Hz vsa 3360 5 2 Automatic call amp answer Automatic dialing or calling by the originating modem is initiated by e AT or V25bis commands e Push button on front panel e DTR 108 1 being enabled e Pulse or tone dialing Tone recognition occurs when there is e A dial request public network or private exchan
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