Page 3 - Contents
Contents Chapter 1 - Introduction ..................................................................................... 7 1.1 Introduction ............................................................................................. 8 1.2 Manual Organization ............................................
Page 7 - Chapter 1 - Introduction
Page 8 - Introduction
8 Chapter 1 - Introduction 1.1 Introduction Welcome to the world of data communications. You have acquired one of the finest rack-mount intelligentmodems available, the MT2834MR6, from Multi-Tech Systems. This owner’s manual will help you install,configure, test, and use your modem. Your MT2834MR6 i...
Page 9 - Description
9 Chapter 1 - Introduction 1.3 Description Each MT2834MR6 card contains six integrated 33,600 bps MultiModems. Each modem on the MT2834MR6card can be configured independently of the others via the MultiModemManager controller card (ModelMR4800 or MR4800E), which can support and control up to 16 Mult...
Page 10 - FCC Regulations for Telephone Line Interconnection
10 Chapter 1 - Introduction 1.4 FCC Regulations for Telephone Line Interconnection 1. 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 howto have r...
Page 11 - Canadian Limitations Notice
11 Chapter 1 - Introduction 1.5 Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of themaximum number of terminals allowed to be connected to a telephone interface. The termination of ainterface may consist of any combina...
Page 12 - Technical Specifications
12 Chapter 1 - Introduction 1.6 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) 14...
Page 14 - Power Supply
14 Chapter 1 - Introduction 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:...
Page 15 - Modem LED Indicators; Busy Switch
15 Chapter 1 - Introduction 1.8 Modem LED Indicators The MT2834MR6 has five LED indicators per modem: TD Transmit Data. This LED blinks when data is being transmitted, on for a space, off for a mark. Thestate of this LED matches that of the TD circuit on Pin 2 of the RS-232C interface. R D Receive D...
Page 17 - Chapter 2 - Dialing and Answering
Page 19 - Call Termination
19 Chapter 2 - Dialing and Answering 2.4 Call Termination There are several methods by which you can terminate a call, or simply stated, hang up: 1. Command Mode Control. It is possible to enter command mode while remaining online by entering anescape sequence ( +++AT<CR> in most cases). From ...
Page 20 - Chapter 3 - AT Commands
Page 21 - Working with AT Commands
21 Chapter 3 - AT Commands 3.1 Working with AT Commands The MT2834MR6’s modems are controlled by instructions called AT commands, so called because theattention characters AT precede each command or command string (sequence of commands). You can sendcommands to the modem from your keyboard while in ...
Page 26 - Dialing Commands
26 Chapter 3 - AT Commands 3.2 Dialing Commands Dialing commands are used to dial and to hang up. D s Dials = phone numberDefault: none The letter D in a command causes the modem to dial the telephone number immediatelyfollowing it. For example, if you type ATD5551212<CR>, the modem dials the ...
Page 27 - Dial Modifier Commands
27 Chapter 3 - AT Commands 3.3 Dial Modifier Commands The dial string can include the digits 0 through 9, the pound sign (# ), the asterisk (* ), and the letters A, B, C,or D. The latter are used by some PBXs; the exact function will depend on the PBX manufacturer’s feature setand implementation. Th...
Page 30 - Phone Number Memory Commands
30 Chapter 3 - AT Commands 3.4 Phone Number Memory Commands The modem can store up to two telephone numbers in nonvolatile memory. You can store the numbers withthe DsNd command, dial them with the Nd command, link them so that one will be automatically dialed afterthe other with the NdNe command, o...
Page 32 - Configuration Storage and Recall Commands
32 Chapter 3 - AT Commands 3.5 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 thedefault parameters in ROM...
Page 36 - Online Connection Commands
36 Chapter 3 - AT Commands 3.7 Online Connection Commands The following commands control the conditions of the online connection. #An Auto Speed Detectionn = 0–3Default: #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 mo...
Page 41 - RS-232 Interface Commands
41 Chapter 3 - AT Commands 3.9 RS-232 Interface Commands These commands define how am MT2834MR6 modem will use and respond to standard RS-232 signals. &Cn Carrier Detect Controln = 0, 1, 2, or 4Default: &C1 The &C command lets you control the Carrier Detect (CD) signal on the RS-232/V.24...
Page 43 - Error Correction and Data Compression Commands
43 Chapter 3 - AT 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 orwithout compression). They are the non-error correction, autoreliable, and reliable modes. You can also turndata compres...
Page 45 - Speed Conversion Commands
45 Chapter 3 - AT Commands 3.11 Speed Conversion Commands Speed conversion allows the MT2834MR6 to communicate at a fixed speed through the serial port whilecommunicating at an independent speed over the online communications link. Speed conversion isnecessary for data compression, since data compre...
Page 47 - Immediate Action Commands
47 Chapter 3 - AT Commands 3.12 Immediate Action Commands Use these commands to get information about AT commands and the current settings of the modem. Foradditional immediate action commands, see “Line Probe Commands.” A/ Repeat Last CommandDefault: None Type A/ to repeat the previous command. Do ...
Page 49 - Flow Control Commands
49 Chapter 3 - AT Commands 3.12 Flow Control Commands Flow control refers to the techniques used by data terminal equipment and the modem to pause and resumethe flow of information between them. It prevents a device from accepting more data than it can handle. Themodem implements flow control in bot...
Page 52 - Escape Sequences
52 Chapter 3 - AT Commands 3.13 Escape Sequences Escape sequences (escape codes) cause the modem to enter command mode from online mode withoutdisconnecting the call. There are two local escape sequences used by the modem, +++AT<CR> and<BREAK>AT<CR>, and one remote escape sequence,...
Page 53 - Remote Configuration Commands
53 Chapter 3 - AT Commands 3.14 Remote Configuration Commands When you are online with another Multi-Tech modem, you can issue AT commands to it by sending a remoteconfiguration escape sequence. The remote modem responds by displaying a menu and asking for a setuppassword. The MT2834MR6 has two defa...
Page 54 - Line Probe Commands
54 Chapter 3 - AT Commands 3.15 Line Probe Commands Before V.34 negotiation, the local and remote modems use modulated calling and answering tones toexchange capability information . If V.34 mode communication is successful, probing signals are exchangedto identify impairments in the telephone chann...
Page 55 - Diagnostic Commands
55 Chapter 3 - AT Commands 3.16 Diagnostic Commands The MT2834MR6 has two diagnostic commands and four diagnostic modes. The power-on self-test isactivated every time power is applied. The U command selects a loopback test, while the &T commandenables a modem to respond to a loopback test from a...
Page 63 - Reading and Assigning S-Register Values
63 Chapter 4 - S-Registers 4.3 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. For example,...
Page 64 - AT Commands Affecting S-Registers
64 Chapter 4 - S-Registers 4.4 AT Commands Affecting S-Registers For maximum throughput, the MT2834MR6's default configuration is for originating a call to another 33,600bps modem that supports error correction, data compression, and flow control. If the receiving modem is notcompatible, the MT2834M...
Page 65 - Data Compression & Speed Conversion
Chapter 5 - Error Correction, Data Compression & Speed Conversion
Page 67 - How V.42 Detects and Corrects Errors
67 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.2 How V.42 Detects and Corrects Errors Some of the better known software-based error-correction protocols include Xmodem and Kermit (forasynchronous file transfer software), X.PC (Tymnet’s asynchronous software protocol), and ...
Page 68 - Data Compression; MNP Classes
68 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.3 Data Compression The MT2834MR6 has both V.42bis and MNP class 5 data compression. ITU-T V.42bis is an internationaldata compression standard that can provide data compression of up to four to one in certain types of data.MNP...
Page 69 - Originate Mode
69 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.5 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 correc...
Page 70 - Modes of Operation
70 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.6 Modes of Operation You can configure your MT2834MR6 in one of three different V.42 modes of operation, each with or withoutcompression. They are the non-error correction, reliable, and autoreliable modes. The modes and datac...
Page 71 - Flow Control
71 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.7 Flow Control Flow control refers to the techniques used by computer devices to stop and restart the flow of data from eachother. Flow control is necessary so that a device does not receive more data than it can handle. In th...
Page 72 - Modem-Initiated Flow Control
72 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.8 Modem-Initiated Flow Control When operating in V.42 reliable mode, the MT2834MR6 stores data in a buffer as it is received. Duringperiods of error-caused retransmissions or compression slowdowns, this buffer may fill up. To ...
Page 74 - and Pacing Commands
74 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 corr...
Page 75 - Speed Conversion
75 Chapter 5 - Error Correction, Data Compression, and Speed Conversion 5.11 Result Codes When the MT2834MR6 connects with another modem with error-correction or data compression enabled, itsCONNECT responses change to inform you of the type of connection. (See Appendix C for a complete list ofresul...
Page 78 - Related Commands
78 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 cannotestablish a reliable connection in that time, the modem drops to non-...
Page 81 - Chapter 6 - Testing and Troubleshooting
81 Chapter 6 - Testing and Troubleshooting 6.1 Introduction Each time you power up the MT2834MR6, it performs an automatic self-test to ensure proper operation. TheMT2834MR6 also has three diagnostic tests: local analog loopback, digital loopback (remote/automatic), anddigital loopback (local/manual...
Page 86 - Chapter 7 - Warranty And Service
86 Chapter 7 - Warranty And Service 7.1 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 orworkmanship for a period of two, five, or ten years (depending on model) from...
Page 88 - Repairs; Repair Procedures for International Customers
88 Chapter 7 - Warranty And Service 7.2 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 DriveMounds View, MN 55112Attn: Repairs,...
Page 89 - Repair Procedures for International Distributors; Internet Site
89 Chapter 7 - Warranty And Service 7.2.3 Repair Procedures for International Distributors Procedures for International Distributors of Multi-Tech products are on the distributor web site:www.multitech.com 7.2.4 Replacement Parts SupplyNet, Inc., can supply you with replacement power supplies, cable...
Page 90 - Appendices
Page 91 - Appendix; Appendix A; ASCII Conversion Chart
91 Appendix Appendix A ASCII Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ NUL 0 0 0 S P 2 0 3 2 @ 4 0 6 4 ` 6 0 9 6 A SOH 0 1 1 ! 2 1 3 3 A 4 1 6 5 a 6 1 9 7 B STX 0 2 2 " 2 2 3 4 B 4 2 6 6 b 6 2 9 8 C ETX 0 3 3 # 2 3 3 5 C 4 3 6 7 c 6 3 9 9 D EOT 0 4 4 $ 2 4 3 6 D...
Page 92 - Appendix B; Dial Pulses
92 Appendix Appendix B Dial Pulses When you pulse dial, as when you make a call with a rotary dial telephone, your telephone or modemgenerates codes in the form of pulses that simulate the opening and closing of old-fashioned electric relays,or switches. The number of pulses in a code are the same a...
Page 93 - Tone Dial Frequencies
93 Appendix Tone Dial Frequencies The tone dialing method combines two frequencies for each of the twelve digits found on a touch-tone dialpad. 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, 7...
Page 94 - Appendix C; Result Code Summary
94 Appendix Appendix C Result Code Summary Multi-Tech Result Codes ( &Q0) Terse Verbose Definition 0 O K Command was executed without error; ready for next command. 1 CONNECT Modem has detected carrier and gone online. 2 RING Modem has detected ring caused by incoming call. 3 NO CARRIER No carri...
Page 96 - Appendix D
96 Appendix Appendix D S-Register Summary Register Unit Range Default Description S0 1 ring 0, 1–255 1 Sets the number of rings until the modem answers.ATS0=0 disables auto answer completely. S1 1 ring 0–255 0 Counts the rings that have occurred. S2 decimal 0–127 43 (+) Sets ASCII code for the escap...
Page 98 - Appendix E; AT Command Summary
98 Appendix Appendix E AT Command Summary Command Values Description A T n/a Attention CodeThe attention code precedes all command lines except A/, A: and escape codes. R E T U R N n/a RETURN KeyPress the RETURN (ENTER) key to execute most commands. A n/a Force Answer ModeAnswer call immediately wit...
Page 106 - Appendix F; RS-232C Interface Specifications
106 Appendix 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 signalsgenerated by the modem are approximately 10...
Page 107 - Functional Description of the RS-232C Signals
107 Appendix Functional Description of the RS-232C Signals Transmitted Data (TD) — Pin 2 (To modem) Signals on this circuit are generated by the local computer and passed to the modem’stransmitter. A positive signal is a space (binary 0) and a negative signal is a mark (binary 1).The transmitting co...
Page 110 - Appendix G; Cable and Connector Diagrams
110 Appendix Appendix G Cable and Connector Diagrams RS-232C Serial Cable 1 1 Frame Ground 1 2 2 Transmit Data 2 3 3 Receive Data 3 4 4 Request to Send 4 5 5 Clear to Send 5 6 6 Data Set Ready 6 7 7 Signal Ground 7 8 8 Carrier Detect 8 9 9 + Voltage Test 9 1 2 1 2 High Speed 1 2 1 5 1 5 Transmit Clo...
Page 111 - APPENDIX H; Introduction to MultiTech Escape Methods
111 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 aremote modem, without disconnecting the call. If so, you will want to take advantage of escape methods thatallow you to change the modem...
Page 112 - How to Select an Escape Method
112 Appendix 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 onlinemode, then use +++AT<CR>. For example, use this method if you find you need to review a help screen inthe middle of a communications session. If ...
Page 113 - S-Registers and Escape Sequence; Aborting an Escape Sequence
113 Appendix 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 <...
Page 114 - APPENDIX I; Introduction to Remote Configuration; Setup
114 Appendix APPENDIX I Introduction to Remote Configuration Remote configuration, a feature of Multi-Tech’s MT2834MR6 modems, is a network management tool thatallows you to configure modems anywhere in your network from one location. With password-protectedremote configuration, you can issue AT com...
Page 115 - Changing the Passwords; Changing the Remote Escape Character
115 Appendix Changing the Passwords 1. Establish a remote configuration link with the remote modem as described above. 2. 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 ER...
Page 116 - Index
