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Multitech CommPlete MT5634HD8 User Manual

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MT5634HD8 User Guide
Title: MTSLOGOK.FH5
Creator: FreeHand 5.0
CreationDate: Fri Aug 23 16:3

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  • Page 1 MT5634HD8 User Guide Title: MTSLOGOK.FH5 Creator: FreeHand 5.0 CreationDate: Fri Aug 23 16:3...
  • 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.

  • Page 3: Federal Communications Commission Statement

    Interconnection {xe "FCC regulations"} 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 4: Canadian Limitations Notice

    FCC Fax Warning{xe "fax warning"} The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device to send any message via a telephone fax machine unless such message clearly contains in a margin at the top or bottom of each page or the first page of the transmission, the date and time it is sent and an identification of the business or other entity, or other individual sending the message and the telephone number of the sending machine or such business, other...

  • Page 5: Table Of Contents

    Table of Contents 1 Introduction Introduction... 2 Manual Organization... 2 LED Indicators... 3 Power Supplies ... 3 Technical Specifications... 4 2 Installation Introduction... 8 Safety Warnings... 8 Pre-Installation Notes... 9 Installation Procedure... 9 3 AT Commands... 11 Working with AT Commands ...12 Modes of Operation ...12 Command Structure...12 Command Editing...13...
  • Page 6 About CompuServe ... 46 About the Internet ... 46 About the Multi-Tech Fax-Back Service... 46 Upgrading the MT5634HD8 Firmware ... 47 Using FlashPro to Upgrade Firmware... 47 Appendix A ASCII Conversion Chart ... 50 Appendix B Dial Pulses and Tones ... 51 Appendix C Result Code Summary...

  • Page 7: Introduction

    1 Introduction CommPlete Communications Server...

  • Page 8: Manual Organization

    The MT5634HD8 is fully compatible with the standard AT command set, and is therefore compatible with all popular communications software packages. This user guide will help you to install, configure, test, and use the MT5634HD8. Manual Organization Chapter 1 Introduction This chapter describes the MT5634HD8 and its LED indicators, gives its technical specifications, and provides a guide to the organization of the manual.

  • Page 9: Led Indicators

    Glossary Index LED Indicators The MT5634HD8 has 16 LED indicators{ XE "indicators" }{ XE "LED indicators" } on the front panel, two for each modem: CD Carrier Detect. {xe "CD signal"}The CD LED lights when the modem detects a valid carrier signal.

  • Page 10: Technical Specifications

    MT5634HD8 User Guide Technical Specifications{ XE "specifications" } "technical specifications"} Model Number Data Rates (Modem)Eight independent modems (Modem A, B, C, D, E, F, G, H), Data Rates (Fax) Data Format (Modem) Configuration Compatibility (Modem) Compatibility (Fax) ITU-T Group 3, T.4, T.30, V.21, V.27ter, V.29, V.17, and EIA...
  • Page 11 Carrier Frequencies ITU-T V.34 Carrier Frequencies: AT&T V.32terbo/ ITU-T V.32bis/V.32 Carrier Frequencies: V.22bis/V.22 or Bell 212A Standard (2400 & 1200 bps) Carrier Frequencies: Bell 103/113 (300 bps) Carrier Frequencies: V.21 Carrier Frequencies: V.23 Fax Modulations Fax Carrier Frequencies Transmit Level Frequency Stability +0.01% Receiver Sensitivity -43 dBm under worst case conditions CommPlete Communications Server...
  • Page 12 MT5634HD8 User Guide AGC Dynamic Range 43 dB Interface Diagnostics Firmware Upgrades Flash memory; available on Multi-Tech’s BBS Indicators Environmental Power Requirements{ x e "power"} Power Consumption Approximately 6 watts Dimensions{ x e "dimensions of MT5634HD8"} Weight Limited Warranty Fuses{ xe "fuses"} TIA / EIA RS-232/ITU-T V.24/V.28...

  • Page 13: Installation

    Installation CommPlete Communications Server...

  • Page 14: Introduction

    The MT5634HD8 assembly consists of a high-density modem card and a front panel{ XE "front panel" }. Figure 1 shows the layout of the MT5634HD8 card. The MT5634HD8 assembly plugs into power and data, Ethernet, and T1 bus connectors on the inside of the CC9600 chassis{ XE "CC9600 chassis"...

  • Page 15: Pre-Installation Notes

    Perform a visual inspection of the MT5634HD8. If you are concerned about its condition, call Technical Support for instructions. The MT5634HD8 must be installed in a segment in which a RASCard with a T1 module is installed. Turn off the RAS segment where the MT5634HD8 will be installed.
  • Page 16 MT5634HD8 User Guide Support the MT5634HD8 by the front panel and the bottom edge of the card, and carefully place it into the CC9600’s open device slot. Make sure the edges of the MT5634HD8 card mate properly with the guides of the device slot.
  • Page 17 Tighten the MT5634HD8’s retaining screws. Repeat steps 1 through 7 for each of the MT5634HD8’s you are installing. Three MT5634HD8’s must be installed for each RAS segment. Turn on power to the RASCard segment. Check the LED indicators on the RASCard and the controllers. If the LEDs on the controller do not light, turn off the RASCard segment.

  • Page 19: At Commands

    AT Commands CommPlete Communications Server...

  • Page 20: Working With At Commands

    MT5634HD8 User Guide Working with AT Commands The MT5634HD8’s modems are controlled by instructions called AT commands, so called because the attention characters{xe "AT commands:attention code"}{xe "AT commands:AT"} AT precede each command or sequence of commands (known as a command string){xe "command string"}. You can send commands to the modem from your keyboard while in terminal mode, or you can use communications software to issue these commands automatically.

  • Page 21: Command Editing

    for example, determines whether the modem returns result codes, while the &Q command selects th e asynch ronou s communica tions mode. A parameter{xe "parameters"}{xe "AT commands:parameters"} after a command (0, 1, 2, etc.) tells the modem which option to use. If you do not specify a parameter, the modem assumes the 0 (zero) option.
  • Page 22 MT5634HD8 User Guide Table 1. AT Commands by Function Topic Dialing Action Dial Modifiers Phone Number Memory Configuration Storage & Recall Modem Responses (Result Codes) Online Connection RS-232 Interface Controls Error Correction & Data Compression Command Description Dial On-hook/off-hook Redial last number...

  • Page 23: Dialing Commands

    For example, if you type ATD5551212<CR>, the modem dials the number 555-1212. The MT5634HD8 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 other characters that are explained in the section “Dial Modifier Commands”, later in this chapter.

  • Page 24: Dial Modifier Commands

    "Tone-Dial command"}{xe "Pulse-Dial command"} Default: T The MT5634HD8’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 ({xe "DTMF...
  • Page 25 Examples: To pulse-dial the number 555-1212, type ATDP5551212 and press E To tone-dial the same number, type ATDT5551212 and press E To call out of a {xe "PBX phone systems"}PBX (switchboard) system where a 9 has to be pulse-dialed, and the rest of the number has to be tone-dialed after pausing for a second dial tone, type ATDP9,T5551212 and press E a pause.) Switch to Speakerphone Mode{xe "AT commands:V"}{xe "Switch to...

  • Page 26: Phone Number Memory Commands

    MT5634HD8 User Guide Flash On-Hook{xe "AT commands:! (exclamation mark)"}{xe "Flash On-Hook command"} Some switchboard systems react to a momentary on-hook condition. Insert an excla- mation mark into the dialing command to cause the modem to “flash” on-hook for half a second, just as if you had pressed the switch hook on a telephone set for half a second.
  • Page 27 &Z n = s Store a Phone Number{xe "AT commands:&Z n = s "} {xe "Store Phone Number command"} s = phone number n= 0, 1, 2 or 3 Default: none You can store a telephone number string in the modem’s phone number memory. You can store four of these strings using the &Zn=s command.

  • Page 28: Configuration Storage And Recall Commands

    MT5634HD8 User Guide Configuration Storage and Recall Commands The MT5634HD8 stores parameters{xe "parameters"} in two places. It stores factory default parameters in read-only memory ({xe "ROM (read-only memory)"}ROM), and{xe "memory:read-only (ROM)"}{xe "memory:nonvolatile (NVRAM)"} custom- ized parameters in {xe "NVRAM (nonvolatile random access memory)"}nonvolatile random access memory (NVRAM){xe "memory:nonvolatile (NVRAM)"}.

  • Page 29: Modem Response (Result Code) Commands

    &Y0 selects the profile stored at location 0 on power-up. Modem Response (Result Code) Commands The MT5634HD8’s modems can give responses to commands. The most common one is OK, but the modems can also alert you or your software to dial tones, busy signals, connection speeds, and whether the connection is made with error correction or compression enabled.
  • Page 30 MT5634HD8 User Guide Result Codes and Call Progress Selection{xe "AT commands:X"}{xe "result codes:call progress selection"}{xe "Result Codes and Call Progress Selection command"} n = 0, 1, 2, 3, 4, 5, 6, or 7 Default: X4 The X command selects which result codes the modem provides in command mode and whether the modem uses “smart dialing{xe "dialing:smart dialing"}{xe "smart...

  • Page 31: Online Connection Commands

    "handshake"} At higher speeds (2400 bps and above) there is no conflict, because all protocols use the Bell frequency of 2225 Hz.
  • Page 32 MT5634HD8 User Guide Carrier Control{xe "AT commands:C"}{xe "carrier control"}{xe "AT commands:Carrier Control"} n = 1 Default: C1 The Cn command provides backward compatibility with some data communications software. C1 enables normal transmit carrier switching. -C n Data Calling Tone{xe "AT commands:-C"}{xe "Data Calling Tone command"}...

  • Page 33: Rs-232 Interface Commands

    Y0 disables the modem’s use of the break signal{xe "break signal"}. RS-232 Interface Commands These commands define how an MT5634HD8 modem will use and respond to standard RS-232{xe "RS-232C"} signals. &C n Carrier Detect Control{xe "RS-232C:controls"}{xe "Carrier Detect Control command"}{xe "CD signal:control of"}{xe "AT commands:&C"}...
  • Page 34 MT5634HD8 User Guide &C0 ignores the state of the carrier from the remote modem. CD is forced high. &C1 allows CD to act normally—to go high when the modem detects a carrier, and to drop when it loses the carrier.

  • Page 35: Modes Of Operation

    &D n Data Terminal Ready Control{xe "RS-232C:controls"}{xe "AT commands:&D"}{xe "DTR signal:control of"}{xe "Data Terminal Ready Control command"} n = 0, 1, 2, or 3 Default: &D2 The Data Terminal Ready (DTR) signal on pin 20 of the RS-232/V.24{xe "RS- 232C"} interface must be high, or “on,” in order for the modem to operate. A high DTR signal tells the modem that th e computer i t is connected to i s rea dy to communi cate th rough th e modem.
  • Page 36 MT5634HD8 User Guide correction modem, with data buffering. This is the same as &Q6, described earlier in this chapter. \N1 causes the modem to function in direct mode. \N2 enables reliable mode{xe "reliable mode"}, in which the modem uses its V.42 error correction capabilities for all transmissions.

  • Page 37: Immediate Action Commands

    \N3 enables auto-reliable mode{xe "auto-reliable mode"}. During the handshaking procedures at the start of the online connection, the modem queries whether the other modem is using V.42{xe "V.42"} error correction{xe "error correction:automatic"}. If the modem determines that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error correction.

  • Page 38: Flow Control Commands

    The MT5634HD8 implements flow control{xe "flow control"} in both directions. When the MT5634HD8 halts the flow of data, it is called flow control, and when the computer halts the flow, it is called pacing{xe "pacing"}.
  • Page 39 &K n Local Flow Control Selection{xe "flow control:disabling"}{xe "AT commands:&K"}{xe "Local Flow Control command"} n = 0, 3, or 4 Default: &K3 The &K command allows you disable flow control, and enable hardware or software flow control. &K0 completely disables data flow control initiated by the modem. (This is the same as \Q0.) &K3 enables the modem’s use of the Clear to Send (CTS) signal on the RS-232/V.24 interface to regulate data flow.
  • Page 40 MT5634HD8 User Guide \Q3 enables the modem’s use of the Clear to Send (CTS) signal on the RS-232/V.24 interface to regulate data flow. When CTS drops, data flow is suspended until the signal goes “high” (on) again. This method of flow control works in conjunction with pacing (i.e., computer-initiated flow control), which uses the Request to Send (RTS)

  • Page 41: Escape Sequences

    \K5 causes the modem to send the break to the remote modem in sequence with transmitted data, non-destructive, non-expedited. +ES=6 Enable Synchronous Buffered Mode{ XE "AT commands:+ES=6" }{ XE "Enable Synchronous Buffered Mode command" } Default: none This command allows an H.324 video application direct access to the synchronous data channel.
  • Page 42 MT5634HD8 User Guide O3 causes the modem to issue a rate renegotiation before returning to online data mode. CommPlete Communications Server...

  • Page 43: Diagnostic Commands

    Any data entered at the local DTE is sent to, and returned from, the remote modem. To function properly, the modems must be online with error correction disabled. Speaker Settings These commands allow you to adjust your modem speaker settings.
  • Page 44 MT5634HD8 User Guide Monitor Speaker Mode{ XE "AT commands:M" }{ XE "Monitor Speaker Mode command" } n = 0, 1, 2, or 3 Default: M 1 The M command allows you to control the modem speaker mode. M0 completely disables the speaker.

  • Page 45: 4 S-Registers

    4 S-Registers CommPlete Communications Server...

  • Page 46: Introduction

    MT5634HD8 User Guide Introduction This chapter describes the MT5634HD8’s S-registers{xe "S-registers:definition"} , 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 47 Note: If you change the S2 value, you must make corresponding changes in your data communications software. Return Character Unit: Decimal Range: 0–127 Default: 13 (^M) S3{xe "S-registers:S3"}{xe "return character"}{xe "carriage return character"} 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 E boards.
  • Page 48 Canadian and International models, where each unit is one ms. In other words, for domestic modems, each tone is sustained for 95 ms followed by a 95 ms pause. The minimum S11 value allowed is 50 ms (50 units). The maximum S11 value is 150 ms (150 units).
  • Page 49 4 S-Registers S-registers:S35" data calling tone" Data Calling Tone{xe " }{xe " Unit: decimal Range: 0–1 Default: 0 (disabled) S35 enables or disables the V.25 data calling tone, which allows remote data, fax and voice discrimination. Setting S35 to zero (0) disables V.25 data calling tone; setting S35 to 1 enables data calling tone.

  • Page 50: Line Rate

    MT5634HD8 User Guide Maximum Dial Line Rate{xe " line rate" Unit: decimal Range: 0–19 Default: 0 S37 sets the maximum dial line rate. When set to zero (0), the maximum dial line rate is the same as the maximum modem speed. This is the most common setting, and allows other modem functions to actually determine the line rate used for each connection.

  • Page 51: Reading And Assigning S-Register Values

    Off-line Time{xe " Unit: 1 second Range: 0, 5-255 Default: 10 S89 sets the length of time, in seconds, a modem waits in the off-line command mode before it goes into standby mode. If S89 is set to 20 seconds, the modem waits 20 seconds in off-line command mode before going into standby mode.

  • Page 52: Examples Of Reading Values

    If you require a different configuration for your application, for example, if you want to use an MT5634HD8 modem strictly as an auto answering device, or for service that does not support error correcti on, you can selecti vel y ch a nge th e command parameters and S-register values in active memory and save the new values by using the {xe "Store Configuration command"}{xe "AT...
  • Page 53 5 Warranty, Service, and Technical Support CommPlete Communications Server...

  • Page 54: Limited Warranty

    MT5634HD8 User Guide Limited Warranty Multi-Tech Systems, Inc. (“MTS”) warrants that this product will be free from defects in material or workmanship for a period of two years from the date of purchase, or, if proof of purchase is not provided, two years from date of shipment.

  • Page 55: Technical Support

    Multi-Tech 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 (612) 785- 3500 (local and international).

  • Page 56: The Multi-Tech Bbs

    The Multi-Tech BBS Multi-Tech maintains a bulletin board system (BBS) for its customers. Information available from the BBS{ XE "BBS, Multi-Tech" } includes new product information, product upgrade data, and problem-solving tips. There is also a message service that lets you request additional information. The phone number for the Multi-Tech BBS is (800) 392-2432 (USA and Canada) or (612) 785-3702 (local and international).

  • Page 57: Reading A Message

    Note: This is the only point at which you can read your mail. You cannot read any messages from the Message Menu. Leaving a Message The Multi-Tech BBS has no public discussion area. However, you may leave a personal message. Select the Message Menu by typing M at the Main Menu.

  • Page 58: Bulletins

    Tech library. Refer to your CompuServe documentation for special operating procedures. About the Internet Multi-Tech is a commercial provider on the Internet{ XE "Internet" }, and we retrieve e-mail messages from the following mailboxes on a periodic basis: tsupport@multitech.com mtsmktg@multitech.com mtssales@multitech.com...

  • Page 59: Upgrading The Mt5634Hd8 Firmware

    The MT5634HD8’s firmware is contained in a flash PROM. At various times, Multi- Tech may add enhancements and/or fixes to this firmware. The flash technology used in the MT5634HD8 allows these upgrades to be loaded directly into the PROM chip through the modem’s serial port, or through the backplane when using the management software.
  • Page 60 MT5634HD8 User Guide CommPlete Communications Server...
  • Page 61 Appendices CommPlete Communications Server...

  • Page 62: Appendix A Ascii Conversion Chart

    MT5634HD8 User Guide Appendix A ASCII Conversion Chart{ XE "ASCII code" } CTRL CODE 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 HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC "...

  • Page 63: Appendix B Dial Pulses And Tones

    Appendix B Dial Pulses and Tones 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. The number of pulses in a code are the same as the digit they encode;...
  • Page 64 MT5634HD8 User Guide 1209 Figure 3. Standard DTMF frequencies The extended DTMF characters (A, B, C, D) are the high-end frequencies (1633 Hz) defined on some telephone sets with a fourth vertical column of buttons. This fourth column provides for extended PBX control functions. The actual functions that are provided depend on the PBX manufacturer’s implementation and feature set.

  • Page 65: Appendix C Result Code Summary

    Appendix C Result Code Summary{xe " result codes:summary" Multi-Tech Result Codes{xe "result codes:Multi- Tech"} 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 7200...
  • Page 66 MT5634HD8 User Guide Extended Result Codes. If the extended result codes configuration option is enabled, EC is added to the following result codes:{ XE "extended result codes" } CONNECT 1200 CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 CONNECT 19200...

  • Page 67: Appendix D S-Register Summary

    Appendix D S-Register Summary{xe " S-registers:summary" Register Unit 1 ring 1 ring decimal decimal decimal decimal 1 sec 1 sec 1 sec 100 ms 1 ms decimal decimal decimal CommPlete Communications Server Range Default Description 0, 1–255 Sets the number of rings before the modem answers.
  • Page 68 MT5634HD8 User Guide Register Unit decimal decimal 1 sec * Values for International and Canadian modems only. † Values for International modems only. ‡ Values for UK modems only. Range Default Description 19 = 33600 bps For testing and debugging only.

  • Page 69: Appendix E At Command Summary

    Appendix E AT Command Summary{xe " AT commands:summary" Command RETURN or ENTER &B n &C n - C n %C n CommPlete Communications Server Values Description Attention Code The attention code precedes all command lines except A / and the escape sequence. RETURN Key Press the RETURN (ENTER) key to execute most commands.
  • Page 70 MT5634HD8 User Guide Command &D n DS n +ES=6 &F n &G n \G n Values Description %C0 Disable V.42bis / MNP 5 data compression. *** %C1 Enable V.42bis / MNP 5 data compression. s = phone # Dial Dial telephone number s , where s may include up to 40 alpha-numeric ch ar act er s, a nd th e L, P, T, V , W , co mma (, ), col on ( : ), sem ic ol on (;...
  • Page 71 Command &J n \J n &K n \K n CommPlete Communications Server Values Description *** \G0 Returns an OK for backward compatibility with some software. n = 0 or 1 Hook Control *** H0 Go on-hook (hang up). Go off-hook. n = 0, 1, 2, 3, Information Request 4, or 9...
  • Page 72 MT5634HD8 User Guide Command &M n \ N n &Q n \Q n Values Description Monitor speaker on during dialing, off during handshaking. n = 0 Communications Mode *** &M0 Asynchronous mode. n = 0 or 1 Modulation Handshake Modem performs handshake only at communication standard specified by S37 and the B command.
  • Page 73 Command S r = n S r ? &S n &T n \ T n & V \ V n CommPlete Communications Server Values Description &K4 . *** \Q3 RTS/CTS hardware flow control. Same as &K3 . r = 0–8, Set Register Value Set value of S-register r to value of n , where n is 10-11, 28,...
  • Page 74 MT5634HD8 User Guide Command &W n \ X n &Y n &Z n = x Values Description n = 0 Store Configuration &W0 Store current settings in NVRAM; modem will load these at power-on or with the ATZ command instead of reading factory ROM defaults.
  • Page 75 Command +++AT<CR> * Factory default on International model ** Not available on U.K. model *** Factory default on North American model CommPlete Communications Server Values Description In dial Flash On-Hook command Exclamation; causes modem to flash on-hook. In dial Detect Call Card command Causes the modem to pause and wait for an AT&T call card “bong”...
  • Page 76 MT5634HD8 User Guide CommPlete Communications Server...

  • Page 77: Glossary

    Glossary CommPlete Communications Server...
  • Page 78 MT5634HD8 User Guide AC (Alternating Current): A power source whose signal crosses a reference voltage (usually called ground or zero). Alternating between a maximum and minimum voltage, AC may also be referred to as a bi-polar signal. Contrast with DC.
  • Page 79 Auto Answer: A modem feature which enables the modem to “off-hook” when it detects an incoming call. Auto Dial: Some modems provide this feature for asynchronous dialing. This feature is a pre- defined macro that allows the user to enter the location of a phone number (i.e.
  • Page 80 MT5634HD8 User Guide uses 8-bit characters , to allow for control characters (i.e., all non-ASCII files). BSC (Binary Synchronous Communications): Also called “bisync”, this communications protocol was the first synchronous data format used by IBM. It is still in use, but is rapidly being replaced by IBM’s newer Synchronous...
  • Page 81 Async Gateway, it is a PC equipped with the appropriate hardware and software package so it can function as a gateway between a LAN and its modems or host connections. COMx Port: A serial communications port on a CommPlete Communications Server CONFIG.SYS file (pronounced “config dot...
  • Page 82 MT5634HD8 User Guide DB-25: A very common 25-pin connector often referred to as an RSs-232 connector because it is the connector over which the RS-232 interface commonly occurs. DB (Direct Current): Usually understood to mean a constant voltage supply that fluctuates only a nominal amount.
  • Page 83 This allows full- duplex modems to send and receive on the same frequency carrier. EIA (Electronics Industries Association); A membership organization founded in 1924 that includes manufactures of electronic parts and systems.
  • Page 84 MT5634HD8 User Guide Floppy Disk: Also called a diskette. It is a round disk with a hole in the middle, made of flexible material and houses in a square envelope or cartridge. A disk drive holds the floppy disk through the hole in its center and spins it within its envelope.
  • Page 85 Interface: A common meeting ground supplied by hardware or software to facilitate a compatible connection and operation between two devices or programs. For example, when two PCs are connected they use a common interface across the physical connectors so that the signals being sent and received are accurately interpreted.
  • Page 86 MT5634HD8 User Guide LRC (Longitudinal Redundancy Check): An error checking method that generates a parity bit from the specified string of bits on a longitudinal track. In a row and column format such as on magnetic tape, LRC is often used with VRC, which creates a parity bit for each character.
  • Page 87 PSK produces the appropriate shift in phase relative to the original carrier. Differential PSK replaces this technology because it is less prone to error. Modems using PSK normally operate at 1200 bps. PSTN (Public Switched Telephone Network): A worldwide public voice telephone...
  • Page 88 MT5634HD8 User Guide Pulse-width: Pertaining to a digital signal. Pulse width refers to the duration of one state between clocking signals. Pulse width roughly corresponds to an analog signal’s wavelength. QAM (Quadrature Amplitude Modulation): A complex method of modulation that...
  • Page 89 This is a common method of transmission between computers on a network or between modems. One or more synchronous characters are transmitted to confirm clocking before each packet of data is transmitted.
  • Page 90 MT5634HD8 User Guide Twisted pair wiring: A type of cabling with one or more pairs of insulated wires wrapped around each other. An inexpensive wiring method used for LAN and telephone applications, also called UTP wiring. UART (Universal Asynchronous Receiver/Transmitter): A chip that transmits and receives data on the serial port.
  • Page 91 It is not widely accepted, because of the analog loops still prevalent in data communications. For this reason, CCITT introduced the X21bis standard for use with synchronous modems. CommPlete Communications Server X.25: CCITT’s definition of a three-level packet-switching protocol to be used between packet-mode DTEs and network DCEs.
  • Page 92 MT5634HD8 User Guide CommPlete Communications Server...

  • Page 93: Index

    Index CommPlete Communications Server...
  • Page 94 MT5634HD8 User Guide abort timer, 12, 18 Answer command, 12, 30 answer mode, 30 Answer Tone command, 22 answering a call, 30, 38 ASCII code, 50 asynchronous communications mode, 22 Asynchronous Communications Mode command command, 22 AT commands ! (exclamation mark), 17...
  • Page 95 18 blind dialing, 15, 21 modifiers, 16 pause time, 17, 36, 38 smart dialing, 15, 21 Dialing Pause command, 17 dimensions of MT5634HD8, 6 Disable Data Calling Tone Transmission command, 18 DSR signal control of, 25 DTMF (dual tone multifrequency)
  • Page 96 MT5634HD8 User Guide parameters, 13, 19 default, 13, 25 PBX phone systems, 16, 17 power, 3, 6 pulse ratios, setting, 51 Pulse-Dial command, 16 Quiet Answer command, 18 redial last number, 16 reliable mode, 25, 26 Repeat Last Command command, 26...
  • Page 98 P/N 82065700...

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