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Boca Bocamodem M144IW User Manual

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  • Page 2 14.4Kbps BOCAMODEM...

  • Page 3: How To Get Technical Assistance

    Before You Begin your Installation The product you have purchased is designed to be easily installed into most IBM PC or compatible systems. Many products have large, easy-to-read legends to allow for the easy configuring of the product. This installation manual contains detailed instructions.
  • Page 4 System ($2 per minute) 407-995-9456 The Standard Free Technical On-Line Support! Support number is for quick CompuServe: GO BOCA answers to specific inquiries on Internet: product features and technical email: support@boca.org questions (call 407-241-8088; M-F, on the World Wide Web: 8 am to 6:30 pm EST).

  • Page 5: Important Notice

    Copyright ©1995 Boca Research, Inc. All rights reserved. No reproduction of this document in any form is allowed without permission in writing from Boca Research, Inc. Boca Research is not liable for any damage resulting from technical or editorial errors or omissions contained in this document. The information in this manual is subject to change without notice.

  • Page 6: Quick Start

    Quick Start! FOR THE EXTERNAL MODEL If you are familiar with personal computers and modems, you may follow the diagram below to quickly connect the 14.4Kbps Modem to your system. Make all necessary connections as shown below. PHONE JACK PHONE (OPTIONAL) MODEM REAR OF ADAPTER...
  • Page 7 Quick Start! FOR THE INTERNAL MODEL If you are familiar with personal computers and modems, you may follow the diagram below to quickly connect the 14.4Kbps Modem to your system. Make all necessary connections as shown below. SET JUMPERS AND INSTALL CARD IN 8- OR 16-BIT SLOT...

  • Page 8: Table Of Contents

    Contents Quick Start ................ 6 Section One: Introduction ..........9 Section Two: Installation (external) ......12 2.1 The Contents of Your Package ...... 12 2.2 Operational Requirements ......13 2.3 Connecting the Phone Line ......14 2.4 Preparing the Modem ........15 2.5 Your Communications Software ....

  • Page 9: Section One: Introduction

    Section One: Introduction The 14.4Kbps modem (internal or external version) combines high-speed data, modem, and fax capability on a single device. It features V.32bis, which provides high- speed data transmission plus support for V.42bis (error correction) and MNP5 (data compression). Features •...
  • Page 10 Installation Hints Your BOCAMODEM has been pre-set at the factory for optimum performance. All defaults are set to allow the modem to negotiate the best possible connection with highest quality, data compression, and error correction. Because of these factory defaults, the suggested initialization (INIT) string is: ATZ.
  • Page 11 • technical specifications, • FCC and DOC (Canada) compliance information, • warranty policies, • how to service your Boca product if necessary • a brief survey of standard and extended AT command sets, S- registers, and high-level protocols, • hardware diagnostics •...

  • Page 12: Section Two: Installation (External)

    Section Two: Installation (External Model) This section explains how to connect the Boca Research 14.4Kbps Modem to your computer. 2.1 The Contents of Your Package Verify that your modem package contains the following items: COMMUNICATIONS INSTALLATION EXTERNAL SOFTWARE & MANUAL MANUAL 14.4Kbps...

  • Page 13: Operational Requirements

    2.2 Operational Requirements The 14.4Kbps Modem has few requirements and is easy to use. Be sure to read the information in the Appendix about connecting to the phone company. In addition, note the following: • The communication settings are controlled by the software that manipulates the serial interface present in your system.

  • Page 14: Connecting The Phone Line

    B O C A M O D E M 14.4Kbps V.32bis FRONT VIEW: BOCA 14.4Kbps MODEM 2.3 Connecting the Phone Line An RJ-11 cable is provided with the purchase of your 14.4Kbps Modem. This section contains information you will need before you connect the telephone line to the 14.4Kbps Modem and explains how to make the proper...

  • Page 15: Preparing The Modem

    TOGGLE ON/OFF (power adapter) CONNECT TO LINE CONNECT TO COMPUTER SERIAL PORT REAR VIEW: BOCA 14.4Kbps MODEM 2.4 Preparing the Modem Follow these simple steps to connect the modem to your computer: 1. Turn off your computer and all peripheral devices.
  • Page 16 Power Power connector switch AC adapter Power jack Phone jack Line jack RS-232 connector 4. Disconnect your present phone cord from the wall jack. Plug the end of the phone cord that came with the modem into the wall jack, and the other end into the RJ- 11 jack at the rear of the modem marked LINE.
  • Page 17 If you want to keep your telephone connected for conventional calls, plug its cord into the other jack at the rear of the modem labeled PHONE. Phone jack 5. Lastly, connect the modem to the computer ’s serial port with the serial cable. The modem is now ready to be tested and operated.

  • Page 18: Your Communications Software

    2.5 Install Your Communications Software Install your software now. When complete, go to the sections 2.6 Testing the Modem and 2.7 Testing the Connection. Depending on the software you choose, refer to the appropriate manual for start-up and configuration. 2.6 Testing the Modem To verify that your modem is working properly, follow these steps: After making sure your communications software is...
  • Page 19 Indicator Definition Status Test Mode FLASHES when modem is in test mode and if any errors are detected. Auto Answer ON when in Auto Answer mode and when online with the host modem. High speed ON when the 14.4Kbps Modem is powered on or communicating with another modem at 4800bps or faster.

  • Page 20: Testing The Connection

    2.7 Testing the Connection 1. If you are using a telephone, check for a dial tone using the telephone handset. If a dial tone is heard, continue with the next step. If you do not hear a dial tone, check the connections you made in 2.4 Preparing the Modem, or refer to Troubleshooting (Section Four).

  • Page 21: Section Three: Installation (Internal)

    Section Three: Installation (Internal Model) This section explains how to install the Boca Research internal 14.4Kbps Modem in your computer. 3.1 The Contents of Your Package Verify that your modem package contains the following items: COMMUNICATIONS INSTALLATION SOFTWARE & MANUAL...

  • Page 22: Communication Settings

    3.2 Communication Settings The 14.4Kbps Modem can be configured as COM1, COM2, COM3, or COM4. The default setting for the modem is COM3 using IRQ5. The modem cannot share the same interrupt with any other device. One way to avoid interrupt-sharing is to select a non- standard interrupt (i.e., IRQ) if it is available, such as IRQ5.
  • Page 23 Your modem has been given a default setting of COM3/IRQ5. Frequently in today’s systems, COM1 and COM2 have already been assigned to other devices. Make sure you run the COMCHECK program which came with the modem to avoid conflicts with other devices already in your system.

  • Page 24: Installing The Modem

    3.3 Installing the 14.4Kbps Modem This subsection provides step-by-step instructions for installing your internal 14.4Kbps Modem. 1. Power off your computer and disconnect any attached devices and power cords. 2. Remove the computer’s cover and locate an available 8- or 16-bit expansion slot. Remove that expansion slot cover and save the screw.

  • Page 25: Connecting The Phone Line

    3.4 Connecting the Phone Line An RJ-11 cable is provided with the purchase of your modem. This sub-section contains information you will need before you connect the telephone line to the modem. It also explains how to make the proper connections from the modem to your telephone line.
  • Page 26 2. If a phone is connected to the telephone wall jack, unplug the phone cable. Then plug the other end of the modem cable into the telephone wall jack. 3. To continue using the phone, connect the phone cable into the PHONE jack on the modem board. PHONE jack To phone (RJ-11 line) 14.4Kbps BOCAMODEM...
  • Page 27 Testing the Connection 1. Power on the computer. 2. If you are using a telephone check for a dial tone using the telephone handset. If a dial tone is heard, continue. If you do not hear a dial tone, check the connections you made in the previous subsection, or refer to Troubleshooting (Section Four).

  • Page 28: Section Four: Troubleshooting

    Section Four: Troubleshooting This section lists common problems that may be encountered and their possible solutions. SYMPTOM POSSIBLE REMEDY • Verify that you have cables plugged in No dial tone. correctly as instructed in Section Two or Three. • Connect a telephone set directly to the wall jack and check for a dial tone.
  • Page 29 SYMPTOM POSSIBLE REMEDY No response when • Verify that the communication software you type in AT is set to the same communications port commands (contd) where your modem is attached (e.g., COM1, COM2). Check IRQ settings in your software and on the modem. •...
  • Page 30 SYMPTOM POSSIBLE REMEDY • Power down your system Garbled characters (INTERNAL) and re-run your (contd) communications software. Check software settings. • Exit the communications program and restart it. • You may not have enabled auto- The modem does answer. Use your software to enable not answer an this function.
  • Page 31 Installation Hints, page 8. My 2400bps (or other • Review earlier suggestions. modem) worked with my system but the Boca modem does not. I need the modem to • Send an AT&Q6N0S37=n where connect at a certain n= 9 for 9600, 6 for 2400, 5 for speed.
  • Page 32 SYMPTOM POSSIBLE REMEDY • Try connecting at a lower speed Connection Errors. (e.g., 9600 or 2400bps). • Turn off error correction/ compression with an AT&Q6%C0 command. • Noisy/poor line conditions may prohibit connection. Have your phone company test your lines. •...

  • Page 33: Appendix A: Command And Protocol Overview

    Appendix A: Command/Protocol Overview In most cases, your communications software will set and control the operation of your modem. Following is a brief survey of the most commonly used Hayes-compatible AT commands for use with your modem. In addition, we’ve also provided information on extended AT command sets, S-Registers, and commands and registers for high-level protocols such as MNP, V.42/V.42bis, and V.32/V.32bis.
  • Page 34 Example: ATH or ATH0 tells the modem to disconnect Extended commands were developed to provide greater functionality and control over modem operations. Their format is the same as the basic command except that an additional parameter is required following the AT prefix and before the numerical parameter.
  • Page 35 Example: S-Register 7 defines the length of the time the modem will wait for a connection. If the value of S- Register is 50, the modem will wait 50 seconds for a connection after dialing. If a connection is not made within 50 seconds, the modem will hang up.
  • Page 36 V.21 The CCITT standard for 300bps communications. Domestic modems follow the Bell 103 standard, but V.21 can accept international calls at 300bps. V.22 The CCITT standard for 1200bps communications. The domestic equivalent is the Bell 212A standard. V.22bis The CCITT standard for 2400bps. V.23 CCITT for 1200bps with a 75bps back channel.

  • Page 37: Appendix B: Hardware Diagnostics

    Appendix B: Hardware Diagnostics The 14.4Kbps modem includes several tests which evaluate the operation of the modem, its connection to the local DTE, and the communications link between the local and remote modems. Use of these tests requires setup of internal registers and may also require the use of two modems and a central office line simulator.
  • Page 38 5. To begin the test, type AT&T1 [ENTER]. The modem should respond with a CONNECT message. 6. After the number of seconds specified in S18, the modem will terminate the test and respond with “OK”. Local Analog Loopback Test with Self-Test This test verifies the integrity of the local modem’s transmit and receive circuits.
  • Page 39 Remote Digital Loopback Test 1. Set the DTE speed from 1200 to 14,400 Bits per second. If the speed is less than 1200 or greater than 14,400 the test WILL NOT operate and a result code of ERROR will be generated if the test is attempted. The baud rate is also limited to the highest baud rate supported by the telephone line (14,400bps modulation is possible if the telephone line is without distortion and...
  • Page 40 7. Issue a dial command to the local modem to instruct it to call the remote modem. Wait until the two modems have established a connection. 8. Type the escape sequence +++ to revert to command mode. The modem will respond with OK. 9.
  • Page 41 3. Issue an AT&Q0 command to the remote modem, also setting it to the direct mode. 4. Issue an AT&T4 to the remote modem. This instructs the remote modem to grant a request for a remote digital loop-back test with self test. 5.

  • Page 42: Appendix C: Technical Specifications

    Appendix C: Technical Specifications Modem Data Rate: 14.4K, 12K, 9600, 7200, 4800, 2400, 1200, or 300bps Fax Data Rate: 14.4K, 12K, 9600, 7200, 4800, 2400bps. Protocol Compatibility: CCITT: CCITT: V.32bis (14.4Kbps), V.32 (9600bps), V.42, V.22 (2400bps), V.21 (1200bps) Bell: Bell 212A (1200bps), Bell 103 (300bps) Fax Modulation Protocols V.29 (9600/7200bps) transmit and receive...

  • Page 43: Appendix D: Compliance Information

    Appendix D: Compliance Information FCC Statement: “This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received including interference that may cause undesired operation.
  • Page 44 Notification to the Telephone Company Notification to the telephone company is no longer required prior to connecting the registered equipment but upon request from the telephone company the user shall tell the telephone company which line the equipment is connected to as well as the registration number and the ringer equivalence of the registered protective circuitry.
  • Page 45 Changes in Telephone Company Equipment or Facilities The telephone company may make changes in its communications facilities, equipment, operations, or procedures, where such action is reasonably required and proper in its business. Should any such changes render the customer ’s terminal equipment incompatible with the telephone company facilities, the customer shall be given adequate notice to make modifications to maintain uninterrupted service.
  • Page 46 Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunction, may give the telecommunications company cause to request the user to disconnect the equipment. Users should ensure, for their own protection, that the electrical ground connections of the power utility, telephone lines, and internal metallic water pipe system, if present, are connected together.

  • Page 47: Appendix E: Warranty Information

    Products which require Limited Warranty service during the warranty period should be delivered to BRI at the address in the Appendix (Servicing Your Boca Product) with proof of purchase, copy of canceled check (if any), and the Return Merchandise Authorization (RMA) number provided by BRI Technical Support.

  • Page 48: Appendix F: Servicing Your Product

    If your 14.4Kbps Modem requires service, first contact the authorized dealer from whom you purchased the modem. If the dealer is unable to assist you, and you must contact Boca Research, Inc., please follow the instructions below. Our electronic BBS is available 24 hours a day at (407) 241-1601 and will support data transmission speeds up to 28.8Kbps with...
  • Page 49 3. Refer to the Warranty Statement if the product is covered under the five-year Boca Research, Inc. Limited Warranty. 4. Certain parts will not be covered under the Boca Research, Inc. Limited Warranty. Dealer installed parts are warranted by the dealer. Parts which you have installed yourself are covered only by the supplier’s warranties.
  • Page 50 Boca Research, Inc. RMA Department - RMA # _____________ 1601 Clint Moore Road Boca Raton, FL 33487-2841 6. If the repairs performed on your modem were covered by the warranty, Boca Research, Inc. will return it prepaid via UPS. 14.4Kbps BOCAMODEM...

  • Page 51: Command Reference

    Command Reference BASIC AT COMMANDS (default values are highlighted) Command Description Attention characters Answer command Re-Execute last command Transmit Carrier Signal ATC0 Transmit carrier signal off. (default) ATC1 Transmit carrier signal on. Dial Modifiers Dial Options Description none Dial. (ATD followed by phone number) ATDL none Re-dial.
  • Page 52 Command Description Command Character Echo ATE0 Disables echoing of the commands to the screen. ATE1 Enables echoing of the commands to the screen. (default) Switch Hook Control ATH0 Instructs modem to go on-hook. ATH1 Instructs modem to go off-hook. Modem Identification ATI0 Displays the product identification code.
  • Page 53 Command Description Return to on line state mode ATO0 Switches the modem from command mode to on- line mode without dialing. ATO1 Switches from command mode to on-line mode an initiates an equalizer retrain sequence during 2400 baud bps operation. Mode responses ATQ0 Enables result codes to be issued to the screen.
  • Page 54 Command Description ATX2 Disables monitoring of busy tones unless forced otherwise by country requirements; sends only OK, CONNECT, RING, NO CARRIER, ERROR, DIAL TONE, NO ANSWER and CONNECT XXXX result codes. ATX3 Enables monitoring of busy tones; sends only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIALTONE, NO ANSWER and CONNECT XXXX.

  • Page 55: Extended At Commands

    Extended AT Commands Command Description Data carrier detect (DCD) signal AT&C0 Forces DCD signal to be on at all times. AT&C1 DCD on indicates presence of data carrier. (default) Data terminal ready (DTR) signal. Interprets the ON to OFF transition of the DTR signal from the DTE according to the &Q settings.
  • Page 56 Note on Flow Control. XON/XOFF is a software-based flow control method, using standard ASCII control characters to pause or resume data transmission.RTS/CTS pacing, a hardware-based method, uses an electrical signal. Signals are exchanged as follows: RECEIVER TRANSMITTER CTS ON START SENDING CTS ON RTS ON (ready to send) CTS OFF...
  • Page 57 Command Description Test and diagnostics AT&T0 Terminates any test in progress. AT&T1 Executes the local analog loopback test. AT&T3 Executes the local digital loopback test. AT&T4 Enables the modem to accept a request from a remote mode for a digital loopback test. (default) AT&T5 Instructs the modem to deny a request from a remote modem for a digital loopback test.

  • Page 58: Mnp Operation

    MNP Operation The 14.4Kbps Modem supports all of the preceding classes. The following AT Commands apply to the MNP protocol. Default values are highlighted. Maximum MNP Block Size. Use this command to transmit smaller blocks of data in a reliable data link connection. AT\A0 set maximum block size to 64 characters.
  • Page 59 Break Control. Determines the modem response when a BREAK is received from the DTE or the remote modem. The values of the parameters vary based on the three following conditions: (1) When a break is received from the DTE during NORMAL or MNP mode: AT\K0, 2, 4 modem enters command mode without sending a break to the remote modem.
  • Page 60 MNP Block Transfer Control. Determines whether or not the modem will use block or stream mode for MNP link. AT\L0 uses stream mode for MNP link connections (DEFAULT) AT\L1 uses block mode for MNP connections Error Correction Operating Mode. Selects the operating mode the modem uses while connected.

  • Page 61: At Commands For V.42/V.42Bis

    AT Commands for V.42/V.42bis The following AT commands apply to the V.42/V.42bis protocol: Compression Control. Determines whether or not modem will use data compression. AT%C0 disables data compression AT%C1 enables MNP5 data compression negotiation AT%C2 enables V42bis data compression AT%C3 enables both V.42bis and MNP5 data compression (DEFAULT) Auto-retrain.
  • Page 62 Report Received Signal Level. AT%L 009 = -9 dBm, 010 = -10dBm, etc. all the way to 043 (-43 dBm) Line signal and noise are determined by the unit of measurement dBm (decibel referenced to one milliwatt). To arrive at a signal/noise ratio, the noise level is subtracted from signal level in dBm.

  • Page 63: S-Registers

    S-Registers This section defines the purpose of the modem registers, and sequentially lists the registers and describes their functions. These registers affect various operating characteristics and allow you to obtain information about the modem, as well as test the modem. Each register has a factory-set value, which you can read or change to fit your needs.
  • Page 64 The following table lists the modem’s registers and their functions. Reg. Range Units Default Definition 0-255 rings Auto-answer 0-255 rings Count incoming rings 0-255 rings Escape character value. 0-127 ASCII Carriage return character. 0-127 ASCII Line feed character. 0-32 ASCII Backspace character.
  • Page 65 Reg. Range Units Default Definition 0-255 seconds Sleep Inactivity Timer. 0-255 seconds Asynchronous DTR Delay. 0-255 seconds Delay Interval. Bit Mapped 9,hex Bit mapped registers. Bit Mapped Bit mapped registers Reserved. 0-255 seconds Inactivity Timer. Bit Mapped Options. 0-255 ASCII XON Character.
  • Page 66 Reg. Range Units Default Definition 0-255 seconds Delay Before Forced Hangup. Bit Mapped Bit Mapped Registers. Bit Mapped Bit Mapped Registers. Bit Mapped Bit Mapped Registers. S42-45 Reserved. 136 or 138 Data Compression Control. NOTE: 136 enables error correction with no compression; 138 enables error correction WITH compression.
  • Page 67 Reg. Range Units Default Definition Bit-Mapped Extended Results Codes. NOTE: Bit values are defined as follows for S95: 0 = CONNECT CODE indicates DCE speed instead of DTE speed. 1 = Append ARQ (automatic repeat request) to verbose CONNECT XXXX result code if protocol is other than none.

  • Page 68: Result Codes

    Result Codes Result Numeric Code Value Description Modem successfully executed a command line. CONNECT Connection made at 300 bps. RING Modem detected an incoming call. NO CARRIER 3 Modem lost or could not detect a remote carrier signal within the Register S7 time. ERROR Modem found an error in the command line.
  • Page 69 Result Numeric Code Value Description +FCERROR +F4 Fax carrier error. CONNECT 13 Connected as data modem during an 7200 answer. CONNECT 14 Connection made at 12000 bps. 12000 CONNECT 15 Connection made at 14400 bps. 14400 CONNECT 16 Connection made at 19200 bps. 19200 CONNECT 17 Connection made at 38400 bps.
  • Page 70 Result Numeric Code Value Description CARRIER 40 Carrier rate of 300 bps. CARRIER 44 V.23 backward channel has been detected. 1200/75 CARRIER 45 V.23 forward channel has been detected 75/1200 CARRIER 46 Carrier rate of 1200 bps. 1200 CARRIER 47 Carrier rate of 2400 bps. 2400 CARRIER 48 Carrier rate of 4800 bps.
  • Page 71 Result Numeric Code Value Description CARRIER 21600 Carrier rate of 21600 bps CARRIER 24000 Carrier rate of 24000 bps CARRIER 26400 Carrier rate of 26400 bps. CARRIER 28800 Carrier rate of 28800 bps. COMPRESSION: The modem has connected in MNP CLASS 5 class 5 and COMPRESSION message reporting has been...

  • Page 72: Glossary

    Glossary algorithm. A formula or procedure which employs various methods defining how data is to be used to give a prescribed result. analog signals. Signals which can vary over a continuous range (e.g., the human voice over conventional telephone lines). Analog circuitry is more subject to distortion and noise, but it is more capable of handling complex signals than are digital signals which can have only discrete values.
  • Page 73 bit-mapped registers. An S-register which contains multiple bit- oriented values. Example: the value of S22 is the sum of the bit values which you select (bits 0-1: speaker volume/value: 0-3; bits 2-3: speaker control/value: 0-3; bits 4-6: limit result codes/value: 0, 4-6, 7). blind dialing.
  • Page 74 communications protocol. A set of procedures which controls how a data communications network operates. DCD. Data Carrier Detect. Indicates to the terminal device that the modem is receiving a valid carrier signal from a remote modem. The carrier is a tone at a specified frequency. DCE.
  • Page 75 error detection and correction. The transmitting modem attaches a special pattern (called a frame check sequence) calculated according to a prescribed algorithm from user-defined data to the end of a block of data. The receiving modem performs the same algorithm and compares it to the one with the transmitted data.
  • Page 76 guard tone. Guard tones are used in the United Kingdom and other countries. This requires that the modem transmit an 1800-Hz tone after it sends an answer tone. The guard tone is controlled by the &G command. Guard tones are not used in the U.S.A. half-duplex.
  • Page 77 long space disconnect. Determines whether or not modem disconnects when it receives a continuous break from a remote modem. Controlled by the ATY command. loopback tests. There are four types of loopback tests which are as follows: (1) the local digital loopback tests the operation of the DTE, including whether or not data is leaving the terminal or computer port;...
  • Page 78 non-volatile RAM. Also NVRAM. Random access memory whose data is retained when power is turned off. This is especially useful for modems to store user-defined default configuration settings and frequently used telephone numbers. This information would be loaded into modem RAM at power-up. on-line state.
  • Page 79 sleep inactivity timer. Determines the length of time the modem operates in normal mode with no activity before entering low-power “sleep” mode. split-speed direction. Determines which direction (transmit or receive) has the 75bps channel and which has the 1200bps channel, but is only active if the \W command is set to 1.
  • Page 80 Index Data Carrier Detect 55 Data Communication Protocols 35 Data Terminal Ready 55 AC wall socket 15 Data transmission rates 9 Asynchronous Mode 56 DB-25 (25-pin male AT Command Reference connector) 13 51-57 Dial Modifiers 51 Automode Enable 52 Dial Stored Number 47 DTE/Modem Flow Control 55-56 Bell standards 35...
  • Page 81 Glossary 72-79 Non-standard IRQs 23 Group III send and receive fax capability 9 On-Line State 53 Operational Requirements Hardware Diagnostics 37-41 (external) 13 Hayes ‘AT’ command set 9, 33, 51-57 Hook flash 51 Pause 51 phone jack types 5 Physical and Electrical Initialization (INIT) string 10 Characteristics 42 Installation Hints 10...
  • Page 82 S-Registers 34-35, 63-67 Wait for dial tone 51 Servicing Your Boca Wait for quiet answer 51 Product 48-50 Warranty Information 47 speaker volume control 9, 52 Store phone number 51 Technical Specifications 42 Telephone Company Requirements 44 Test and Diagnostics 57...
  • Page 84 Manual Part No. 9431 Rev. 2.1 14.4Kbps BOCAMODEM...

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