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Multitech MultiModem MT2834MR6 User Manual

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MT2834MR6

User Guide

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Summary of Contents for Multitech MultiModem MT2834MR6

  • Page 1: User Guide

    MultiModem MT2834MR6 User Guide...
  • Page 2 Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes. Revision...

  • Page 3: Table Of Contents

    Technical Specifications ... 12 Power Supply ... 14 Modem LED Indicators ... 15 Busy Switch ... 15 1.10 MT2834MR6 Installation Notes ... 16 1.11 Safety Warnings ... 16 Chapter 2 - Dialing and Answering ... 17 Introduction ... 18 Dial-Up Automatic Answering ... 18 Dial-Up Handshaking Details ...
  • Page 4 3.13 Escape Sequences ... 52 3.14 Remote Configuration Commands ... 53 3.15 Line Probe Commands ... 54 3.16 Diagnostic Commands... 55 Chapter 4 - S-Registers ... 56 Introduction ... 57 S-Registers ... 57 Reading and Assigning S-Register Values ... 63 4.3.1 Examples of Assigning Values ...
  • Page 5 Local Digital Loopback Test (V.54 Loop 2) ... 84 6.4.1 Test Procedure ... 84 Chapter 7 - Warranty & Service ... 85 Multi-Tech Systems, Inc. Warranty & Repairs Policies ... 86 7.1.1 Warranty ... 86 7.1.2 U.S. and Canadian Customers ... 86 7.1.3...
  • Page 6 Appendix B ... 92 Dial Pulses ... 92 Tone Dial Frequencies ... 93 Appendix C ... 94 Result Code Summary ... 94 Appendix D ... 96 S-Register Summary ... 96 Appendix E ... 98 AT Command Summary ... 98 Appendix F ... 106 RS-232C Interface Specifications ...

  • Page 7: Chapter 1 - Introduction

    Chapter 1 - Introduction...

  • Page 8: Introduction

    MT2834MR6, from Multi-Tech Systems. This owner’s manual will help you install, configure, test, and use your modem. Your MT2834MR6 is designed to operate as an enhanced ITU-T V.34 dial-up modem. As such, it includes the advanced features of Multi-Tech standalone modems, such as the popular MultiModemZDXb.

  • Page 9: Description

    The modem supports both pulse and tone dialing, and can recognize dial tones and busy signals for reliable call-progress detection. The MT2834MR6 is registered by the FCC for direct connection to the public telephone networks. No Data Access Arrangements (DAAs) are required.

  • Page 10: Fcc Regulations For Telephone Line Interconnection

    FCC Regulations for Telephone Line Interconnection No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty. Contact Multi-Tech Systems, Inc. for details of how to have repairs made.

  • Page 11: Canadian Limitations Notice

    Chapter 1 - Introduction Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination of a interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5.

  • Page 12: Technical Specifications

    Technical Specifications Model Number MT2834MR6 Data Rates (Modem) Six independent modems (Modem A, B, C, D, E, F), each operating at 33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000, 9600, 4800, 2400, 1200, or 0-300 bps Data Rates (Fax)
  • Page 13 Carrier Frequencies: Transmit originate: Bell 103/113 (300 bps) Receive originate: Transmit answer: Receive answer: Carrier Frequencies: Transmit originate: V.21 Receive originate: Transmit answer: Receive answer: Carrier Frequencies: Transmit originate: V.23 Receive originate: Transmit answer: Receive answer: Fax Modulations V.21Ch2 FSK at 300 bps V.27ter DPSK at 4800 and 2400 bps V.29 QAM at 9600 and 7200 bps V.17 TCM at 14400, 12000, 9600, and 7200 bps...

  • Page 14: Power Supply

    Firmware Upgrades Via flash PROM technology on Multi-Tech’s BBS Indicators LEDs for Transmit Data, Receive Data, Carrier Detect, Speed, and Off Hook/Out- Of-Service Controls Toggle switches for busy-out Environmental Temperature range: 0°–50° C (32°–120° F) Humidity range: 20–90% (noncondensing) Power 5 VDC at 0.95 A Requirements ±16 VDC at 0.1 A...

  • Page 15: Modem Led Indicators

    Busy Switch The MT2834MR6 has six two-position Busy switches on the front panel. Each switch can be used to create a “busy-out” (OOS) condition for one of the six on-board modems (i.e., modem A, B, C, D, E, or F).

  • Page 16: Mt2834Mr6 Installation Notes

    1.10 MT2834MR6 Installation Notes All installation must be done by a qualified service person. The installation instructions in your MultiModemManager Owner’s Manual include information about the use of blanking plates to cover empty slots in the card frame. Be sure to follow those instructions.

  • Page 17: Chapter 2 - Dialing And Answering

    Chapter 2 - Dialing and Answering...

  • Page 18: Introduction

    ITU-T V.34 full duplex dial-up modems. Dial-Up Automatic Answering The MT2834MR6 can answer calls automatically. The MT2834MR6 is in originate mode in its idle state. When it detects an incoming call, it automatically switches to answer mode. You can program the modem to answer a call after a certain number of rings by using register S0 (see Chapter 4).

  • Page 19: Call Termination

    Call Termination There are several methods by which you can terminate a call, or simply stated, hang up: Command Mode Control. It is possible to enter command mode while remaining online by entering an escape sequence ( +++AT<CR> in most cases). From command mode, you can return to the online state by typing ATO , or you can terminate the call by using the H command.

  • Page 20: Chapter 3 - At Commands

    Chapter 3 - AT Commands...

  • Page 21: Working With At Commands

    The MT2834MR6 is in command mode when it is not dialing or online. When it is in command mode, you have access to a complete communications system that allows you to use several features, including the basic AT command set described in this chapter.

  • Page 22: Command Structure

    The effect is the same as backspacing the command, only quicker. The MT2834MR6 stores characters entered in a command in the modem’s command buffer until they are executed by pressing ENTER. The command buffer’s capacity is 60 characters. The attention characters (AT) do not count in the 60 allowed command characters.
  • Page 23 Table 3-1. AT Commands by Function Topic: Command: Dialing Action Dial Modifiers Phone Number D...N Memory N...N Configuration &W Storage & Recall &F Modem Responses (Result Codes) &Q &A Online Connection &CD >DT &G &P &RD Description: Dial Continuous redial On-hook/off-hook Pulse dialing Tone dialing...
  • Page 24 Table 3-1. AT Commands by Function (con't) Topic: Command: V.34 Controls &RA RS-232 Interface &C Controls &D &R &S &RF &SF Error Correction & &E0 Data Compression &E1 &E2 &E14 &E15 Speed Controls Immediate Action &RN &RR Flow Control &BS &E3 &E4 &E5...
  • Page 25 Table 3-1. AT Commands by Function (con't) Topic: Command: &E10 &E11 &E12 &E13 Escape +++AT<CR> Sequences <BREAK>AT<CR> Remote %%%AT<CR> Configuration Line Probes &RP Diagnostics &T Description: Non-error correction mode flow control off Non-error correction mode flow control on Pacing off Pacing on Number of XOFF characters sent Default in-band escape sequence...

  • Page 26: Dialing Commands

    For example, if you type ATD5551212<CR>, the modem dials the number 555- 1212. The MT2834MR6 supports several dialing methods. With the D command, you can specify either pulse (ATDP) or tone (ATDT) dialing. You can also modify the dialing command with several characters that are explained in “Dial Modifier Commands”...

  • Page 27: Dial Modifier Commands

    Pulse or Tone Dialing Default: P The MT2834MR6’s modems can dial numbers by using pulse dialing, tone dialing, or a combination of both methods. Pulse dialing, used by rotary-dial telephones, uses the timed opening and closing of a relay to encode the numbers. Tone dialing, used by push-button (touch-tone) telephones, uses dual tone multifrequency (DTMF) dialing.
  • Page 28 Dialing Pause Enter a comma in the dialing string to make the modem pause while dialing. This pause lasts two seconds (North American models) or four seconds (U.K. and International models) for each comma entered. You can force longer pauses by entering multiple commas, or you can change the length of the pause caused by a comma by setting register S8 to any value from 0 through 255 seconds (North American models), 4 through 7 seconds (U.K.
  • Page 29 Chapter 3 - AT Commands Call Card Tone Detect Use the $ command to dial services that require you to enter your call card number after a tone. A $ character in the dialing string causes the modem to pause and wait for an AT&T call card “bong”...

  • Page 30: Phone Number Memory Commands

    Phone Number Memory Commands The modem can store up to two telephone numbers in nonvolatile memory. You can store the numbers with the DsNd command, dial them with the Nd command, link them so that one will be automatically dialed after the other with the NdNe command, or list them with the L command.
  • Page 31 List Stored Telephone Numbers Use the L command to display dialing commands stored in the modem’s nonvolatile memory. Typing ATL<CR> displays the stored N numbers in the following format: All digits and command letters are displayed. The N number is shown first, followed by the complete dialing command and telephone number as originally entered.

  • Page 32: Configuration Storage And Recall Commands

    Configuration Storage and Recall Commands The MT2834MR6 stores parameters in two places. It stores factory default parameters in read-only memory (ROM), and customized parameters in nonvolatile random access memory (NVRAM). You cannot change the default parameters in ROM; however, you can change parameters in temporary memory and then store them in NVRAM as custom settings.
  • Page 33 Table 3-2. Where the Modem Reads Configuration Parameters Previous Command AT&W1 (default) AT&W0 AT&F8&W0 AT&F9&W0 Reset Modem The Z command resets the modem to its default configuration and clears the command buffer. The result is the same as turning the modem off and on. When you type ATZ, the state of the &W command determines where the default values originate.

  • Page 34: Modem Response (Result Code) Commands

    Modem Response (Result Code) Commands The MT2834MR6’s modems can give responses to commands. The most common one is OK, but the modems also can alert you or your software to dial tones, busy signals, connection speeds, and whether the connection is made with error correction or compression enabled. These responses are called result codes, and they can be terse or verbose, Multi-Tech or standard, basic or extended.
  • Page 35 = 0 or 1 Default: &A0 The &A command controls the MT2834MR6’s answerback feature. Answerbacks are used in some online realty applications and elsewhere as a security measure. The &A command enables a modem to return a message to an identification request from another computer.

  • Page 36: Online Connection Commands

    = 0–3 Default: #A0 An MT2834MR6 modem can operate as a 33,600 bps, 28,800 bps, 19,200 bps, 14,400 bps, 9600 bps, 4800 bps, 2400 bps, or 300 bps modem. Use the #A command to select the speed that the modem uses for initial handshaking and subsequent speed selection. The #A command does not control the originating bps rate of the modem (that is done by the modem baud rate command $MB), but only the answer mode starting speed.
  • Page 37 &CDn Cleardown at Disconnect n = 0 or 1 Default: &CD0 In the V.32, V.32bis, and V.34 protocols, a cleardown is sent by one of the modems to signal the other modem that it is going to hang up. A cleardown is rate renegotiation in which the modem that is hanging up tells the other modem that it has no speeds that it can connect at.
  • Page 38 = 0 or 1 Default: *H0 The *H1 command causes the MT2834MR6 to remain out of service and return a busy signal until configuration from the MultiModemManager dedicated management console has finished. If no configuration option is set on the dedicated management console, the MT2834MR remains out of service for ten seconds after disconnect.
  • Page 39 Calling Tone n = 0 or 1 Default: $T1 The $T command enables or disables the modem’s calling tone, which is required by some European countries to identify the caller as a modem. $T0 enables the calling tone. $T1 disables the calling tone. Trellis-Coded Modulation n = 0 or 1 Default: #T1...

  • Page 40: Commands

    = 0 or 1 Default: #V1 Some V.32/V.32bis modems have problems handshaking when the MT2834MR6 includes V.32terbo mode (19,200 bps) in its handshake. The bits that are used in the rate sequence for V.32terbo can cause handshake failure. Use the #V command to include or exclude V.32terbo mode from the handshake.

  • Page 41: Interface Commands

    RS-232 Interface Commands These commands define how am MT2834MR6 modem will use and respond to standard RS-232 signals. &Cn Carrier Detect Control n = 0, 1, 2, or 4 Default: &C1 The &C command lets you control the Carrier Detect (CD) signal on the RS-232/V.24 interface.
  • Page 42 &Sn Data Set Ready Control n = 0, 1, or 2 Default: &S1 Use the &S command to control the state of the Data Set Ready (DSR) signal on the RS- 232/V.24 interface. Normally, DSR follows CD. You can force the signal high; allow it to act normally;...

  • Page 43: Error Correction And Data Compression Commands

    3.10 Error Correction and Data Compression Commands You can configure a modem to any of three different V.42 modes of operation (each mode can be with or without compression). They are the non-error correction, autoreliable, and reliable modes. You can also turn data compression on or off.
  • Page 44 V.42 Error Correction at 300 bps n = 0 or 1 Default: $E0 At 300 bps, error correction is not normally used. $E0 disables 300 bps/V.42 error correction altogether. $E1 enables the modem to function at 300 bps in non-error correction (&E0), autoreliable (&E1), or reliable (&E2) mode.

  • Page 45: Speed Conversion Commands

    3.11 Speed Conversion Commands Speed conversion allows the MT2834MR6 to communicate at a fixed speed through the serial port while communicating at an independent speed over the online communications link. Speed conversion is necessary for data compression, since data compression requires data to be sent from the computer to the modem at a rate up to four times faster than the modem’s transmission speed.
  • Page 46 = speed Default: $SB57600 The $SB command sets the speed of the MT2834MR6’s serial port in both originate and answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 115,200 bps, regardless of the modem’s transmission speed setting.

  • Page 47: Immediate Action Commands

    ATI1 requests the modem’s firmware version number. You can use this command to identify your modem’s firmware level when calling Technical Support. ATI2 requests the product name, such as MT2834MR6. ATI5 requests the digital signal processor version number. L5, L7...
  • Page 48 &RN Rate Renegotiation Default: none The &RN command forces the modem to perform a rate renegotiation while online. To issue it, you must first escape to command mode by issuing the +++AT<CR> command. &RR Retrain Default: None The &RR command forces the modem to perform an immediate retrain while online. To issue it, you must first escape to command mode by issuing the +++AT<CR>...

  • Page 49: Flow Control Commands

    = 0 or 1 Default: $EB0 The MT2834MR6 can operate with either a 10-bit format (one start bit, seven data bits, one parity bit, and one stop bit) or an 11-bit format (one start bit, eight data bits, one parity bit, and one stop bit) in both command and online modes.
  • Page 50 = 8 or 9 Default: &E8 If the MT2834MR6 is used with Hewlett Packard (or compatible) equipment, it can be configured to respond to ENQ/ACK pacing as a complement to any other form of active flow control or pacing. In that case, pacing from the Hewlett Packard equipment is processed according to the HP protocol.
  • Page 51 &En Pacing (Computer-Initiated Flow Control) n = 12 or 13 Default: &E13 Pacing is the means by which the DTE (data terminal equipment—your computer or terminal) regulates the stream of incoming data. It is only enabled when the modem has some form of flow control active, such as RTS/CTS or XON/XOFF.

  • Page 52: Escape Sequences

    3.13 Escape Sequences Escape sequences (escape codes) cause the modem to enter command mode from online mode without disconnecting the call. There are two local escape sequences used by the modem, +++AT<CR> and <BREAK>AT<CR>, and one remote escape sequence, %%%AT<CR> (see “Remote Configuration”). +++AT<CR>...

  • Page 53: Remote Configuration Commands

    The remote modem responds by displaying a menu and asking for a setup password. The MT2834MR6 has two default passwords. Please note that if you change them, you cannot retrieve them by resetting the modem by using AT&W1; you must know the new passwords to make any further changes.

  • Page 54: Line Probe Commands

    3.15 Line Probe Commands Before V.34 negotiation, the local and remote modems use modulated calling and answering tones to exchange capability information . If V.34 mode communication is successful, probing signals are exchanged to identify impairments in the telephone channel. Using the results of these line probes, communication parameters are set, including carrier frequencies and data rates used for transmission.

  • Page 55: Diagnostic Commands

    The U command selects a loopback test, while the &T command enables a modem to respond to a loopback test from another modem. See Chapter 6, “Testing the MT2834MR6,” for a fuller discussion. Refer to the L8 command to see how to list the diagnostic online status. &Tn...

  • Page 56: Chapter 4 - S-Registers

    Chapter 4 - S-Registers...

  • Page 57: Introduction

    Introduction This chapter describes the MT2834MR6’s S-registers , which are small regions of memory where modem configuration information is stored. Whereas AT commands tell a modem what to do, S-registers tell the modem how to do it. Each S-register has a name that consists of the letter S and a number ( S0 , S1 , S2 , etc.), hence the term S-register .
  • Page 58 Return Character Unit: Decimal Range: 0–127 Default: 13 (^M) S3 defines the carriage return character by its decimal ASCII code. The default setting is the ^M character (decimal 13), which is the code for the ENTER key on most keyboards. S3 may be set for any ASCII character.
  • Page 59 Time for Carrier (Abort Timer) Unit: 1 second Range: 1–255 (U.S.A.) 1–45 (Canada and International) 1–55 (U.K.) Default: 45 (North America and International) 55 (U.K.) S7 determines the abort timer delay time, which is the amount of time your modem will wait for a carrier signal before it disconnects.
  • Page 60 Some PBX and CBX phone systems require the modem’s DSR, CTS, and/or CD signals to drop briefly when calls are disconnected. The MT2834MR6’s &R , &S , and &C commands can cause the modem to drop these signals for a specified time upon disconnect, and then bring the signals up again.
  • Page 61 Inactivity Timer Unit: 1 minute Range: 0, 1–255 minutes Default: 0 (disabled) S30 can be used to cause the modem to disconnect if no data is transmitted or received for a specified time. S30 runs during both reliable and non-error correction connections. The timer restarts any time a data character passes through the serial port (either sent or received).
  • Page 62 Force V.34 Connect Speed Unit: N/A Range: 0, 33, 31, 28, 26, 24, 21, 19, 16, 14, 12, 96, or 48 Default: 0 (disabled) S43 forces the modem to attempt to connect at a fixed speed in V.34 mode. The two-digit value corresponds to the first two digits of the speed ( S43=21 sets the connect speed to 21.6K bps, S43=96 sets it to 9600 bps, etc.).

  • Page 63: Reading And Assigning S-Register Values

    Reading and Assigning S-Register Values Use the S command to assign a value to an S-register and to read an S-register’s current value. To read an S-register value, in terminal mode, type S , the S-register number, and a question mark (?), and press ENTER.

  • Page 64: At Commands Affecting S-Registers

    MT2834MR6 can match any ITU-T or Bell standard modem (but not proprietary protocols). If you require a different configuration for your application, for example, if you want to use an MT2834MR6 modem strictly as an autoanswering device, or for service that does not support error correction, you can selectively change the command parameters and S-register values in active memory and save the new values by using the &W command.

  • Page 65: Chapter 5 - Error Correction, Data Compression & Speed Conversion

    Chapter 5 - Error Correction, Data Compression & Speed Conversion...

  • Page 66: Introduction

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion Introduction The MT2834MR6 has intelligent features beyond those of the AT command set described in Chapter 3. This chapter describes high performance features and commands that provide error correction, data compression and speed conversion capabilities.

  • Page 67: How V.42 Detects And Corrects Errors

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion How V.42 Detects and Corrects Errors Some of the better known software-based error-correction protocols include Xmodem and Kermit (for asynchronous file transfer software), X.PC (Tymnet’s asynchronous software protocol), and SDLC and HDLC, two popular synchronous protocols common in the IBM mainframe environment.

  • Page 68: Data Compression

    To achieve a data rate that is higher than the modem baud rate, turn Baud Adjust off ( $BA0 ) and operate the serial port at a higher speed than the modem baud rate. For the MT2834MR6, set the serial port to 115,200 bps ( $SB115200 ).

  • Page 69: Mode Select Command (#L)

    V.42 Mode Select Command ( #L ) The V.42 Mode Select command ( #L ) selects which type of error correction your MT2834MR6 will use for transmissions. The V.42 standard implements both MNP Class 3 & 4 and LAP-M error correction protocols.

  • Page 70: Modes Of Operation

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion Modes of Operation You can configure your MT2834MR6 in one of three different V.42 modes of operation, each with or without compression. They are the non-error correction, reliable, and autoreliable modes. The modes and data compression features are selected with commands described later in this chapter in “Compression, Error...

  • Page 71: Flow Control

    Flow control is necessary so that a device does not receive more data than it can handle. In the case of the MT2834MR6, there is a need for flow control in both directions. Flow control for data passing from your computer to the modem is called modem-initiated flow control, and flow control for data passing from the modem to your computer is called computer/terminal-initiated pacing (see Figure 5-1).

  • Page 72: Modem-Initiated Flow Control

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion Modem-Initiated Flow Control When operating in V.42 reliable mode, the MT2834MR6 stores data in a buffer as it is received. During periods of error-caused retransmissions or compression slowdowns, this buffer may fill up. To prevent buffer overflow and subsequent loss of data, the modem uses flow control to signal the computer attached to its RS- 232 port that the modem buffer is close to being full.

  • Page 73: Pacing (&E13)

    When pacing is disabled on the modem, the modem ignores pacing. Before you enable pacing on the MT2834MR6, you must select a flow control method. When pacing is enabled, the MT2834MR6 responds either to XON/XOFF commands, or to the toggling of the RTS (Request to Send) signal on Pin 4 of the RS-232 interface, depending on what you selected as your flow control method.

  • Page 74: Compression, Error Correction, Flow Control, And Pacing Commands

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.10 Compression, Error Correction, Flow Control, and Pacing Commands The MT2834MR6 has several commands that control error correction, data compression, and flow control: 5.10.1 V.42 Error Correction Modes &E0 Non-auto correction mode (no error correction).

  • Page 75: Result Codes

    5.12 Speed Conversion Speed conversion allows the MT2834MR6 to communicate at one speed over the phone line, and at another speed at the RS-232 interface. The speed (baud rate) of the RS-232 interface, in bits per second (bps) can be fixed independently of the speed of the online transmissions.

  • Page 76: Baud Adjust ($Ba)

    MT2834MR6, the MT2834MR6 will automatically drop to a lower speed in an attempt to match the speed of that modem. For example, if the MT2834MR6 is set for 28,800 bps and calls another modem that has a top speed of 9600 bps, it will drop to 9600 bps.

  • Page 77: Serial Port Baud Rate ($Sb)

    5.12.3 Serial Port Baud Rate ($SB) The $SB command presets the speed of the MT2834MR6’s RS-232 serial port in both the originate and the answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 115,200 bps, regardless of the modem’s transmission speed setting.It also sets the default speed at which...

  • Page 78: Related Commands

    Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.13 Related Commands 5.13.1 Autoreliable Buffering ($A) In autoreliable mode, the modem is given four seconds to establish a reliable connection. If it cannot establish a reliable connection in that time, the modem drops to non-error correction mode. Any data received during this period is normally discarded.

  • Page 79: Retransmit Count ($R)

    Flow control methods are used by the MT2834MR6 to prevent data loss from buffer overflow. The modem can both initiate it (flow control) and respond to it (pacing), using either XON/XOFF commands or RS-232 signaling via the serial port’s CTS and RTS signals.

  • Page 80: Chapter 6 - Testing & Troubleshooting

    Chapter 6 - Testing & Troubleshooting...

  • Page 81: Introduction

    Chapter 6 - Testing and Troubleshooting Introduction Each time you power up the MT2834MR6, it performs an automatic self-test to ensure proper operation. The MT2834MR6 also has three diagnostic tests: local analog loopback, digital loopback (remote/automatic), and digital loopback (local/manual). These ITU-T V.54 loopback tests isolate telephone circuit and transmission problems.

  • Page 82: Local Analog Loopback Test (V.54 Loop 3)

    Local Analog Loopback Test (V.54 Loop 3) In this test, data from your computer or terminal is sent to your modem’s transmitter, converted into analog form, looped back to the modem’s receiver, converted into digital form, and then sent to your monitor for verification.

  • Page 83: Remote Digital Loopback Test (V.54 Loop 2)

    Remote Digital Loopback Test (V.54 Loop 2) In this test, your modem must be online with another modem, such as another ZDX, that is set up to respond to a request for remote digital loopback. With the ZDX, this ability to respond is controlled by the &T command.

  • Page 84: Local Digital Loopback Test (V.54 Loop 2)

    Local Digital Loopback Test (V.54 Loop 2) This test is identical to the remote digital loopback test with one exception. Instead of using your modem to signal a remote modem to place itself in digital loopback mode, your modem is placed in digital loopback mode while the remote modem is not.

  • Page 85: Chapter 7 - Warranty & Service

    Chapter 7 - Warranty & Service...

  • Page 86: Multi-Tech Systems, Inc. Warranty & Repairs Policies

    7.1.1 Warranty Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of purchase is not provided, two, five, or ten years (depending on model) from date of shipment.

  • Page 87: International Customers (Outside U.s.a. And Canada)

    Chapter 7 - Warranty And Service 7.1.3 International Customers (outside U.S.A. and Canada) Your original point of purchase reseller may offer the quickest and most economical repair option for your Multi-Tech product. You may also contact any Multi-Tech sales office for information about the nearest distributor or other repair service for your Multi-Tech product: www.multitech.com .

  • Page 88: Repairs

    7.2.1 Repair Procedures for U.S. and Canadian Customers In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota factory: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 Attn: Repairs, Serial # ____________ A Returned Materials Authorization (RMA) is not required.

  • Page 89: Repair Procedures For International Distributors

    Internet: http://www.thesupplynet.com Technical Support Multi-Tech Systems has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, please call 800 972- 2439 (USA and Canada) or 763 785-3500 (international and local).

  • Page 90: Appendices

    Appendices...

  • Page 91: Appendix A

    Appendix A ASCII Conversion Chart CTRL CODE HEX DEC CODE HEX DEC " & < > Null, or all zeros Start of Header Start of Text End of Text End of Transmission Enquiry Acknowledge Bell or Alarm Backspace Horizontal Tab Line Feed CODE HEX DEC CODE HEX DEC...

  • Page 92: Appendix B

    Appendix Appendix B Dial Pulses When you pulse dial, as when you make a call with a rotary dial telephone, your telephone or modem generates codes in the form of pulses that simulate the opening and closing of old-fashioned electric relays, or switches.

  • Page 93: Tone Dial Frequencies

    Tone Dial Frequencies The tone dialing method combines two frequencies for each of the twelve digits found on a touch-tone dial pad. This method is referred to as dual-tone multi-frequency (DTMF) dialing. The four horizontal rows on a touch-tone keypad use four low-frequency tones (697, 770, 852, 941 Hz), while the three vertical columns use three high-frequency tones (1209, 1336, 1477 Hz).

  • Page 94: Appendix C

    Appendix C Result Code Summary Multi-Tech Result Codes ( &Q0 ) Terse Verbose CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 CONNECT 19200 CONNECT 21600 CONNECT 1275 CONNECT 24000 CONNECT 26400 CONNECT 28800 CONNECT 31200...
  • Page 95 LAP-M Reliable Mode. If the modem connects using LAP-M error correction, the word LAPM or letter L is added to the CONNECT responses as follows: CONNECT LAPM CONNECT 1200 LAPM CONNECT 2400 LAPM CONNECT 4800 LAPM CONNECT 9600 LAPM CONNECT 14400 LAPM CONNECT 19200 LAPM CONNECT 21600 LAPM CONNECT 24000 LAPM...

  • Page 96: Appendix D

    Appendix D S-Register Summary Register Unit Range 1 ring 0, 1–255 1 1 ring 0–255 decimal 0–127 decimal 0–127 decimal 0–127 decimal 0–127 1 sec 2–255 4–255† 4–7‡ 1 sec 1–255 1–45* 1–55‡ 1 sec 0–255 4–255† 4–7‡ 100 ms 1–255 100 ms 1–254, 1 ms 1–255...
  • Page 97 1 char- 0–60 acter 1 sec 0, 1-255 1 sec 0-255 decimal 33, 31, 28, 26, 24, 21, 19, 16, 14, 12, 96, or 48 decimal 33, 31, 28, 26, 24, 21, 19, 16, 14, 12, 96, or 48 1 sec 0–254, Sets the number of command characters allowed after +++AT.

  • Page 98: Appendix E

    Appendix E AT Command Summary Command Values RETURN &An n = 0 or 1 *** &A0 n = 0 or 1 *** $A0 n = 0–3 *** #A0 n = 0 or 1 *** B0 &BSn n = 0 or 1 *** &BS1 Maximum transmit block size of 256 characters.
  • Page 99 &CDn n = 0 or 1 *** &CD0 Enable cleardown. s = phone # DsNd s = phone # d = 0 or 1 &Dn n = 0, 1, 2, or 3 *** &D2 %DCn n = 0 or 1 *** %DC0 Enable command mode.
  • Page 100 &En n = 0–15 *** &E1 *** &E4 *** &E6 *** &E8 *** &E10 Non-error correction mode flow control off. *** &E13 Pacing on. *** &E15 Data compression enabled. n = 0 or 1 *** $E0 $EBn n = 0 or 1 *** $EB0 10-bit mode enabled.
  • Page 101 n = 0, 1, or 2 *** #F2 &Gn n = 0, 1, or 2 *** &G0 n = 0 or 1 n = 0 or 1 *** *H0 n = 0, 1, 2, or 5 x = password #I=x x = password n = 0, 5–11 n = 0, 1, 2,...
  • Page 102 $MBn n = speed *** $MB33600 d = 0 or 1 NdNe... d = 0 or 1 e = 1 or 0 In dialing *** Pulse-Dial command &Pn n = 0 or 1 *** &P0 n = 0–2 *** Q0 &Qn n = 0 or 1 *** &Q0...
  • Page 103 &RFn n = 0 or 1 *** &RF1 Let CTS act independently. &RN &RP &RR n = 0 or 1 *** $R0 Sr=n r = 0–11, 13, 24, 25, 30, 32, 34, 36, 37, 43, 48, or 94; n varies r = 0–11, 13, 24, 25, 30, 32, 34, 36,...
  • Page 104 &Tn n = 4 or 5 *** &T5 n = 0 or 1 *** $T1 n = 0 or 1 *** #T1 n = 0–3 n = 0 or 1 *** V1 n = 0 or 1 *** #V0 In dialing command &Wn n = 0 or 1...
  • Page 105 At end of dial command At end of dial command In dial command In dial command In dial command +++AT<CR> <BREAK>AT<CR> %%%AT<CR> Continuous Redial Colon; causes continuous redial of number until answered (10 in North American models). Not used in U.K. or International models. Return to Command Mode After Dialing Semi-colon;...

  • Page 106: Appendix F

    Appendix F RS-232C Interface Specifications The MT2834MR6’s serial interface circuits have been designed to meet the electrical specifications in EIA (Electronic Industries Association) Recommended Standard 232, Revision C (RS-232C). All signals generated by the modem are approximately 10 volts when measured across a load of 3000 ohms or greater.

  • Page 107: Functional Description Of The Rs-232C Signals

    Functional Description of the RS-232C Signals Transmitted Data (TD) — Pin 2 Signals on this circuit are generated by the local computer and passed to the modem’s transmitter. A positive signal is a space (binary 0) and a negative signal is a mark (binary 1). The transmitting computer should hold this line in the marking state when no data is being transmitted, including intervals between characters or words.

  • Page 108: Test Voltage (+V) - Pin 9

    Transmit Clock (TC) — Pin 15 The TC signal does not apply to the MT2834MR6, since it is used only in the synchronous mode. The clock is a square wave and is used to provide the computer or terminal with timing information for its Transmit Data circuit (pin 2).

  • Page 109: Ring Indicator (Ri) - Pin 22

    The Terminal Busy/Out of Service (OOS) circuit is not defined in the RS-232C standard, but is used by Multi-Tech Systems and most manufacturers to make the phone lines busy to incoming phone calls. Pin 25 is not typically connected to the RS-232C interface when shipped from the factory;...

  • Page 110: Appendix G

    Appendix G Cable and Connector Diagrams RS-232C Serial Cable 25-pin male connector (DB-25P) 25-pin female connector (DB-25S) on back of rack Connects to terminal or computer RS-232C interface (serial port). Gender and pin-out depends on device. Frame Ground Transmit Data Receive Data Request to Send Clear to Send...

  • Page 111: Appendix H

    Appendix APPENDIX H Introduction to MultiTech Escape Methods You may sometimes find it necessary to issue AT commands to your modem, while you are online with a remote modem, without disconnecting the call. If so, you will want to take advantage of escape methods that allow you to change the modem’s mode of operation from online mode to command mode.

  • Page 112: How To Select An Escape Method

    How to Select an Escape Method If you want your modem to escape and then wait for you to issue a command before it will return to online mode, then use +++AT<CR>. For example, use this method if you find you need to review a help screen in the middle of a communications session.

  • Page 113: S-Registers And Escape Sequence

    S-Registers and Escape Sequence There are two S-registers to modify the functioning of escape sequences. Register S32 establishes a value for how much time may elapse between the receipt of the beginning of the escape sequence, whether <BREAK> AT or +++AT, and the receipt of a <CR>. This interval is known as wait-for-<CR>-time, or break passthrough.

  • Page 114: Appendix I

    APPENDIX I Introduction to Remote Configuration Remote configuration, a feature of Multi-Tech’s MT2834MR6 modems, is a network management tool that allows you to configure modems anywhere in your network from one location. With password-protected remote configuration, you can issue AT commands to a remote Multi-Tech modem for maintenance or troubleshooting as if you were on site.

  • Page 115: Changing The Passwords

    Changing the Passwords Establish a remote configuration link with the remote modem as described above. Type AT#IMULTI-TECH (or AT#I xxxxxx if you have replaced the MULTI-TECH password with xxxxxx ) and press ENTER. The modem responds with OK if the login password is correct, and ERROR if it is wrong.

  • Page 116: Index

    Index...
  • Page 117 Index Abort timer 19, 21, 28, 29, 59, 63 Analog loopback test 82 Answer command 21, 52 Answer mode 27, 46, 52 Answer Tone command 36 Answerback command 35 Answering a call 52, 63 Asymmetric Bit Rate command 40 Asynchronous Word Length command 49 AT Command Control command 21, 36 AT Command Summary 98 AT commands 21...
  • Page 118 A: 26 AT 21, 22 attention code 21, 22 B 36 command string limit 22 D 21, 26 D...N... 30 disabling command mode 21, 36 E 34 editing 22 functional summary 23, 24, 25 H 19, 26 I 47 L 31 L10 54 L11 54 L5 47, 64...
  • Page 119 Data compression 66, 68, 74 speed conversion 45 Data Compression command 43 Data Set Ready Control command 42 Data Terminal Ready Control command 41 Description of MT2834MR6 9 Diagnostic commands 55 Dial a Stored Number command 30 Dial command 21, 26 Dial pulses 92...
  • Page 120 Flash On-Hook command 28 Flow control 41, 49, 50, 51, 74 commands 49 CTS/RTS enable 49 disabling 49 hardware (RTS/CTS) 72 no-error correction mode 73 non-error correction mode 50 software (XON/XOFF) 72 XON/XOFF pass through 50 Flow Control Disable command 49 Format Line Probe Data command 54 Fuses 14 Go Back Online command 52...
  • Page 121 Pacing 49, 50, 73 enable/disable 51 ENQ/ACK 50, 73 Pacing command 51, 74 Parameters 22, 32, 47 default 22, 41 Parity 49 PBX phone systems 27, 60 PBX/CBX disconnect drop time 41, 42, 60 Power 14 Pulse ratios, setting 92 Pulse-Dial command 27 Pulse-Dial Ratios command 38 Quiet Answer command 28...
  • Page 122 S9 59 S94 38, 62 summary 96 Safety 16 Serial port baud rate 46 Serial Port Baud Rate command 77 Set Pulse Dial Ratios command 92 Setup Password command 53 Smart dialing 26, 28, 35 Specifications 12 Speed conversion 45, 46, 66, 75 Speed, data transmission 15 Speed indicator 15 Square Wave Ring Detect command 38...
  • Page 123 S000326A...

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