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Paradyne 3760 User Manual

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  • Page 1 You have accessed an older version of a Paradyne product document. Paradyne is no longer a subsidiary of AT&T. Any reference to AT&T Paradyne is amended to read Paradyne Corporation.
  • Page 2 3760-A2-GB92-00 P a r a dyn e Issue 1 November 1994 KeepInTouch Card Modem Model 3760-B2 User’s Guide Printed on recycled paper...
  • Page 3 Important Regulatory Information Important Regulatory Information COPYRIGHT 1994 AT&T Paradyne Corporation* All Rights Reserved Printed in U.S.A. Notice This publication is protected by federal copyright law. No part of this publication may be copied or distributed, transcribed, stored in a retrieval system, or translated into any human or computer language in any form or by any means, electronic, mechanical, magnetic, manual or otherwise, or disclosed to third parties without the express written permission of AT&T Paradyne...
  • Page 4 Important Regulatory Information Trademarks Bell is a registered trademark of the Regional Bell Operating Company. KeepInTouch is a trademark of AT&T. MNP is a registered trademark of Microcom, Inc. PKUNZIP is a registered trademark of PKWARE, Inc. All other product names are copyrighted and registered trademarks of their respective owners.
  • Page 5 Important Regulatory Information In addition, if the equipment is to be used with telecommunications circuits, take the following precautions: – Never install telephone wiring during a lightning storm. – Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations. –...
  • Page 6 Important Regulatory Information 4. If the modem causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be required. But if advance notice is not practical, the telephone company will notify the customer as soon as possible.
  • Page 7 Important Regulatory Information EMI Warnings WARNING: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 8 Important Regulatory Information Canada Notice To The Users Of The Canadian Public Switched Telephone Network The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.
  • Page 9 Important Regulatory Information If your equipment is in need of repair, return it to its place of purchase or arrange to have your equipment repaired by contacting Inventory Control Office, 100 York Blvd., Suite 200, Richmond Hill, Ontario L4B1J8, telephone (416) 494-0453. Issue 1 November 1994...

  • Page 10: Table Of Contents

    Contents Introduction Welcome to the World of Portable, High-Speed Data Communications! KeepInTouch Card Modem Package Supplied Equipment Additional Equipment You Will Need Where to Find Additional Information Installation KeepInTouch Card Modem Installation Procedures Fax Application Software Using Your Modem What is a Modem? Operating Modes (Command and Data) Using AT Commands Making a Call with Your Modem...
  • Page 11 Contents An Overview of File Transfers and Fax Operation File Transfers Fax Operation AT Command Set and S-Registers AT Commands and S-Registers Troubleshooting Technical Specifications Response Codes Advanced Modem Concepts Changing Modem-to-Modem Connection Data Rates Error Control Data Compression Flow Control Modem-to-Computer Flow Control Computer-to-Computer Flow Control Modem-to-Modem Flow Control...
  • Page 12 Figures Introduction 1-1 Supplied Equipment Installation Modem Installation Using Your Modem Dial Data Network Advanced Modem Concepts Modem-to-Computer Flow Control Various Flow Control Methods ......
  • Page 13 Tables AT Command Set and S-Registers AT Command Reference S-Register Reference Troubleshooting Modem Health Modem — Computer Connection Modem — Telephone Line Connection Online Operation Fax Operation Technical Specifications Technical Specifications Response Codes Response Codes Enabled by X and \V Command Basic Response Codes (\V0) Modified Response Codes (\V1) V.42 Extended Response Codes (\V2)

  • Page 14: Introduction

    Introduction Welcome to the World of Portable, High-Speed Data Communications! Congratulations on your purchase of an AT&T Paradyne KeepInTouch Card modem. The KeepInTouch Card is a credit card size modem that combines high-speed V.32bis data communications with send-and-receive fax capability. The modem fits into any notebook or laptop personal computer that has a Personal Computer Memory Card International Association (PCMCIA) Type II socket, and allows you to keep in...

  • Page 15: Keepintouch Card Modem Package

    Introduction KeepInTouch Card Modem Package The following sections describe what equipment is supplied and what equipment is required to install and operate the modem (see Figure 1-1). Supplied Equipment The following hardware and software is included with the modem: One KeepInTouch Card modem One user’s guide A 2-pin modular telephone cord.

  • Page 16: Additional Equipment You Will Need

    Introduction Additional Equipment You Will Need The following additional hardware and software is necessary to install and operate your modem. A notebook or laptop personal computer that supports a PCMCIA Type II socket. Card and Socket Services that comply with PCMCIA Release 2.1.

  • Page 17: Installation

    Installation KeepInTouch Card Modem Installation Procedures This section describes how to install your Model 3760-B2 KeepInTouch Card modem. Please take a minute to review these procedures before installing your modem. Use Figure 2-1 and the following procedures to install your modem.
  • Page 18 Installation Figure 2-1. Modem Installation 3. Connection to a Telephone Outlet Plug the modular cord’s 2-pin connector into the modem’s 2-pin rear edge connector. Since the 2-pin connector is not keyed, it does not matter which way it is plugged in. Next, plug the cord’s modular telephone plug into the telephone jack.

  • Page 19: Fax Application Software

    Installation 4. Make sure that your modem is installed and that your PCMCIA slot is set-up for modem operation before using a communications or fax application. 5. Your PC must now be set up to recognize the modem. This task is performed automatically by the PCMCIA card enablers, also called Card and Socket services, which are installed on your PC by the manufacturer.

  • Page 20: Using Your Modem

    Using Your Modem This chapter highlights some of the basic functions and commands necessary to operate your modem. Whether you consider yourself a novice or an experienced user in data communications, you may want to read through some of the examples to become familiar with your modem’s operation.

  • Page 21: Operating Modes (Command And Data)

    Using Your Modem Figure 3-1. Dial Data Network Operating Modes (Command and Data) Before a modem goes online (establishes a successful connection with a remote modem), it is considered to be in Command mode, an idle state where you can modify its operating parameters or issue modem commands.

  • Page 22: Using At Commands

    Using Your Modem Another period of idle time must also follow the escape sequence before you enter any AT commands. This idle time before and after the escape sequence prevents the escape sequence characters from being misinterpreted as part of the data stream being sent between the modems.

  • Page 23: Making A Call With Your Modem

    Using Your Modem Commands can be entered one at a time or in strings (several commands at once – for example, ATM1L2). Strings can have up to 40 characters after the AT prefix. Spaces, parentheses, and hyphens are not considered characters.

  • Page 24: Dial Modifiers

    Using Your Modem Dial Modifiers The following can be used as dial modifiers: T – Touch-tone dialing. Any digit 0—9, * , # , A, B, C, or D can be dialed as tone. P – Pulse dialing. Only the digits 0—9 can be dialed in Pulse Dial mode.

  • Page 25: Examples Of Dial Command Strings

    Using Your Modem ! – Hook flash. This causes the modem to go on-hook for a 0.75 seconds. ; – Return to Command mode. Modem returns to Command mode after dialing a number without disconnecting the call. This allows AT command strings that exceed the 40-character limit to be linked together and is useful when using a calling card number or an international telephone number.

  • Page 26: Disconnecting A Call

    Using Your Modem Calling long distance This is another example of using Tone dialing, this time to place a long distance call. The spaces, parentheses, and dashes are used to make the number easier to read, but are ignored by the modem.

  • Page 27: Manually Answering A Call

    Using Your Modem If you would like to know more about disconnecting a call, refer to the following commands in Chapter 4: +++ (escape sequence), O (Return to Online Data Mode), X (Response Codes, Dial Tone Detect, Busy Tone Detect), Y (Long Space Disconnect), &D (DTR Control), \N (Set Operating Mode), \T (Set Inactivity Timer), S7 (No Answer Time-out), and S10 (No Carrier Disconnect).

  • Page 28: G Using The Escape Sequence - Switching Between Data Mode And Online Command Mode

    Using Your Modem Using the Escape Sequence — Switching Between Data Mode and Online Command Mode To enter online Command mode while in Data mode, enter the following sequence. For more information on Command and Data modes, see page 3-2. TYPE: The modem enters online Command mode and responds with an OK.

  • Page 29: V Command

    Using Your Modem On the other hand, User Profile 0 and User Profile 1 are nonvolatile memory areas that can permanently store configuration options to the modem’s Electrically Erasable Programmable Read Only Memory (EEPROM) chip. If your modem requires a particular configuration to work with an application, then those settings can be created and saved to one of the two nonvolatile memory areas.

  • Page 30: Reload Factory Settings Command (&F)

    Using Your Modem To use the &W command: TYPE: AT&W n where n is 0 for User Profile 0 and 1 for User Profile 1. PRESS: Enter The changes are saved and the modem responds with an OK. Reload Factory Settings Command (&F) The modem ships from the factory ready to operate with your computer and transfer data over a normal telephone line.

  • Page 31: Reload Settings From A User Profile (&Y)

    Using Your Modem Reload Settings from a User Profile (&Y) Use the &Y command to select whether the contents of either User Profile 0 or User Profile 1 are loaded into Active memory each time the modem turns on or when a reset command (Z) is issued.

  • Page 32: File Transfers

    Using Your Modem File Transfers Two terms essential to file transfers are download and upload. A download occurs when you want to receive a file from a host site (such as a BBS or another computer). An upload occurs when you want to send a file to a host site. However, before you can do this, the following must occur: Your modem and PC must be configured for modem operation before executing your communications...

  • Page 33: Fax Operation

    Using Your Modem Fax Operation Fax software essentially turns your computer and modem into a fax machine and allows you to send a file to or receive a file from another fax modem or fax machine. Similar to your communications software, your fax software uses basic AT commands for functions such as dialing and answering calls and for speaker control and adjustments.

  • Page 34: At Command Set And S-Registers

    AT Command Set and S Registers AT Commands and S-Registers This chapter provides a list of all AT commands and S-Registers supported by the KeepInTouch Card modem. This chapter first lists AT commands in alphabetical order followed by S-Registers listed in numerical order. Factory settings are listed in bold. In general, AT commands are responsible for instructing the modem to do a task, such as dialing, hanging-up, loading factory default settings, etc.
  • Page 35 AT Command Set and S-Registers Table 4-1. AT Command Reference (1 of 18) Command Description Escape sequence The escape sequence allows the modem to exit Data mode and enter online Command mode. For more information on this command, see Chapter 3. Repeat Last Command This command re-executes the last ‘AT’...
  • Page 36 AT Command Set and S-Registers Table 4-1. AT Command Reference (2 of 18) Command Description Dial This command causes the modem to immediately go off-hook and dial a telephone number with corresponding dial modifiers. Dial modifiers are parameters that define how the modem should dial the telephone number.
  • Page 37 AT Command Set and S-Registers Table 4-1. AT Command Reference (3 of 18) Command Description Command Character Echo This command controls whether or not the characters you enter from your computer’s keyboard are echoed back to your monitor when the modem is in Command mode. Disables echo.
  • Page 38 AT Command Set and S-Registers Table 4-1. AT Command Reference (4 of 18) Command Description Select Data Rate Handshake This command allows you to select whether or not the modem-to-modem data rate can be different than the local computer-to-modem data rate. For more information on this command, refer to Appendix D, Advanced Modem Concepts.
  • Page 39 AT Command Set and S-Registers Table 4-1. AT Command Reference (5 of 18) Command Description S n ? View S-Register This command is display the contents of an current S-Register (in decimal format). n = S-Register. Tone Dial (Touch-tone dialing method) This command configures the modem for touch-tone dialing.
  • Page 40 AT Command Set and S-Registers Table 4-1. AT Command Reference (6 of 18) Command Description Response Codes, Dial Tone Detect, Busy Tone Detect This command controls three different configuration options. Response Codes are the messages from the modem, displayed as either words or numbers. This command controls which response codes are reported from the modem.
  • Page 41 AT Command Set and S-Registers Table 4-1. AT Command Reference (7 of 18) Command Description Reserved. Reset and Load Stored Profile This command causes the modem to go on-hook (hang-up), performs a warm reset, and then load a User Profile (which has been previously stored in the modem’s memory) into the Active Profile.
  • Page 42 AT Command Set and S-Registers Table 4-1. AT Command Reference (8 of 18) Command Description \C n Set Auto-reliable Buffer In V.42 auto-reliable mode (set by the \N3 command), this command is used to determine the fallback method and may enable data buffering.
  • Page 43 AT Command Set and S-Registers Table 4-1. AT Command Reference (9 of 18) Command Description \J n BPS Rate Adjustment If enabled, the serial-port speed will automatically be changed to the modem-connection speed, forcing the user to change the bps rate of the DTE-to-modem, if needed. If disabled, the serial-port speed is independent of the connection speed, which allows much greater throughput when using error correction and data compression.
  • Page 44 AT Command Set and S-Registers Table 4-1. AT Command Reference (10 of 18) Command Description \K n If Connected and using a Reliable Mode (\N2, \N3, or \N4), (cont’d) then transmit break to remote modem: \K0, \K2, \K4 If in Command mode and using a Reliable Mode (\N2, \N3, or \N4), then transmit break to remote modem: If connected and using Direct Mode (\N1), then transmit break to remote modem:...
  • Page 45 AT Command Set and S-Registers Table 4-1. AT Command Reference (11 of 18) Command Description \N n Set Operating Mode This command determines the type of connection attempted by the modem. For more information on this command, refer to Appendix D, Advanced Modem Concepts . Normal Mode —...
  • Page 46 AT Command Set and S-Registers Table 4-1. AT Command Reference (12 of 18) Command Description \T n Set Inactivity Timer During a normal or reliable connection, this command forces the modem to disconnect if no data is transmitted or received within a specified time period.
  • Page 47 AT Command Set and S-Registers Table 4-1. AT Command Reference (13 of 18) Command Description &D n Data Terminal Ready (DTR) Control This command controls what actions are taken by the modem based upon the Data Terminal Ready (DTR) signal. &D0 The modem ignores DTR and assumes it is always active.
  • Page 48 AT Command Set and S-Registers Table 4-1. AT Command Reference (14 of 18) Command Description &P n Dial Pulse Ratio This command determines the make/break (off-hook/on-hook) ratio during pulse dialing. &P0 Make = 39%, Break = 61% (for use in the United States).
  • Page 49 AT Command Set and S-Registers Table 4-1. AT Command Reference (15 of 18) Command Description &U Disable Trellis Coding This command selects whether the modem will transmit and receive modulated 9600 bps carrier with QAM or Trellis encoding for V.32 Trellis coding (forward error correction) is recommended for all users.
  • Page 50 AT Command Set and S-Registers Table 4-1. AT Command Reference (16 of 18) Command Description &W n Write (Save) Changes to Memory This command allows you to save a subset of the Active Profile configuration options (command and S-Register settings) in a User Profile. This command stores the information in the nonvolatile RAM of the modem.
  • Page 51 AT Command Set and S-Registers Table 4-1. AT Command Reference (17 of 18) Command Description %A n Set Auto-reliable Fallback character In auto-reliable mode (\N3), with auto-reliable fallback character enabled (\C2), receipt of the fallback character from the line during the V.42 detection phase will cause the modem to switch to normal mode.
  • Page 52 AT Command Set and S-Registers Table 4-1. AT Command Reference (18 of 18) Command Description –C n Generate Data Modem Calling Tone This command is used to select whether or not the modem will send 1300 Hz calling tone when originating a Data Modem connection.
  • Page 53 AT Command Set and S-Registers Table 4-2. S-Register Reference (1 of 6) S-Register Description S0= n Auto-Answer Ring Number This S-Register determines the number of rings the modem will count before automatically answering a call. A ring count of 0 will disable the auto answer feature. n = 0–255.
  • Page 54 AT Command Set and S-Registers Table 4-2. S-Register Reference (2 of 6) S-Register Description S6= n Blind Dial Pause Time This S-Register determines how long (in seconds) the modem waits, after going off-hook, before dialing a telephone number when Dial Tone Detect has been disabled (X0, X1, or X3).
  • Page 55 AT Command Set and S-Registers Table 4-2. S-Register Reference (3 of 6) S-Register Description S10= n No Carrier Disconnect This S-Register determines how long (in tenths of seconds) the modem allows the carrier signal to be off before disconnecting the call. This allows for a temporary loss of the remote modem carrier without causing the local modem to hang up.
  • Page 56 AT Command Set and S-Registers Table 4-2. S-Register Reference (4 of 6) S-Register Description S25= n DTR Detection This S-Register defines the minimum amount of time that DTR has to remain off (i.e., on-to-off-to-on transitions) before the modem performs the function specified by ‘&Dn’ command.
  • Page 57 AT Command Set and S-Registers Table 4-2. S-Register Reference (5 of 6) S-Register Description S37= n Maximum Allowable Data Rate This S-Register selects the maximum allowable line speed. For more information on this command, refer to Appendix D. n = 0 DTE rate n = 3 300 bps n = 5 1200 bps n = 6 2400 bps...
  • Page 58 AT Command Set and S-Registers Table 4-2. S-Register Reference (6 of 6) S-Register Description S108= n Retrain Signal Quality Selector This S-Register controls when the modem should retrain. n = 0 Never retrains. n = 1 Low Quality — retrains after a large number of data errors.
  • Page 59 Troubleshooting This appendix points out basic problems that can occur when operating a modem. It begins with simple actions and progresses to more detailed reasons as to why your modem may not operate. Use the hints provided in Tables A-1 through A-5 to troubleshoot problems you may encounter.

  • Page 60: A Troubleshooting

    Troubleshooting Table A-1. Modem Health Symptom Action Modem does not Make sure the modem is properly seated in the respond PCMCIA slot. Make sure the PC is PCMCIA compliant. Make sure the PC is turned ON. Make sure that the COM port selected by the card enabler on your PC is available and is not being used by another device.
  • Page 61 Troubleshooting Table A-3 provides some solutions to problems that can occur when your modem tries to answer or originate a call. Table A-3. Modem — Telephone Line Connection (1 of 4) Action CONNECTION PROBLEMS — Symptom Dial Environments in Answer mode Modem does Make sure the modem and PCMCIA socket are not go off-hook...
  • Page 62 Troubleshooting Table A-3. Modem — Telephone Line Connection (2 of 4) Action CONNECTION PROBLEMS — Symptom Dial Environments in Originate mode Modem does Make sure the modem and PCMCIA socket are not go off-hook configured for modem operation. and begin Make sure the telephone line connector is connected to dialing the modem.
  • Page 63 Troubleshooting Table A-3. Modem — Telephone Line Connection (3 of 4) Action CONNECTION PROBLEMS — Symptom Dial Environments in Originate mode Intermittent Use the &T7 command to perform a remote digital disconnects, loopback test with pattern test. high error rates, Perform a local analog loopback with a Pattern test.
  • Page 64 Troubleshooting Table A-3. Modem — Telephone Line Connection (4 of 4) Action CONNECTION PROBLEMS — Symptom Dial Environments in Originate mode Modem You may have a poor telephone line connection. Try establishes and dialing again. disconnects a call The remote modem may have encountered an error control disconnect, where the modem is configured to establish a call using error correction.
  • Page 65 Troubleshooting If the modems are having trouble passing data after connecting, check the recommendations and solutions to this problem in Table A-4. Table A-4. Online Operation Symptom Action Data is scrambled Use your communications software to verify that the character format (data bits, parity, and stop bits) is set to the same value in both modems.

  • Page 66: Technical Specifications

    Technical Specifications Table B-1 lists technical specifications for the KeepInTouch Card modem. Table B-1. Technical Specifications (1 of 2) Specifications APPROVALS FCC Part 15 FCC Part 68 DOC CS-03 COMPATIBILITY Dial-Line Modulations Fax Modulations ENVIRONMENT Operating Temperature Relative Humidity Shock and Vibration Storage Temperature Description See modem label for identification number...

  • Page 67: Data Rates

    Technical Specifications Table B-1. Technical Specifications (2 of 2) INTERFACES PC Connection Telephone Line Connection DIMENSIONS Height Width Length TRANSMIT LEVEL Dial Line DATA RATES Dial Line Computer Data Rates ERROR CONTROL DATA COMPRESSION CCITT V.42bis and MNP 5 Issue 1 November 1994 68-pin PCMCIA Type II connector 2-pin telephone line connector (RJ11C in USA, CA11A in Canada)

  • Page 68: C Response Codes

    Response Codes Response codes are informational messages sent from the modem and displayed on your monitor. These messages are the modem’s response to commands you have sent to the modem. They can inform you of the status of a call (Ring, No Answer), or whether or not a command is valid (OK, Error), or whether or not the modem has connected using error control (Connect 14,400 REL-MNP).
  • Page 69 Response Codes Table C-1. Response Codes Enabled by X and \V Command Dial Tone Busy Tone Detection Detection X0 Disabled Disabled X1 Disabled Disabled X2 Enabled Disabled X3 Disabled Enabled X4 Enabled Enabled Table C-2 describes the response codes supported by the KeepInTouch Card modem.
  • Page 70 Response Codes Table C-2. Basic Response Codes (\V0) (2 of 2) Numeric Word Format Format CONNECT 14400 Connection at 14,400 bps +FCERROR Tables C-3 and C-4 list the response codes which can be turned on by using the \V1 and \V2 commands, respectively. Table C-3.
  • Page 71 Response Codes Table C-4. V.42 Extended Response Codes (\V2) Numeric Format Issue 1 November 1994 Word Format CONNECT 300/REL–MNP CONNECT 1200/REL–MNP CONNECT 2400/REL–MNP CONNECT 4800/REL–MNP CONNECT 7200/REL–MNP CONNECT 9600/REL–MNP CONNECT 12000/REL–MNP CONNECT 14400/REL–MNP CONNECT 300/REL–MNP 5 CONNECT 1200/REL–MNP 5 CONNECT 2400/REL–MNP 5 CONNECT 4800/REL–MNP 5 CONNECT 7200/REL–MNP 5 CONNECT 9600/REL–MNP 5...
  • Page 72 Advanced Modem Concepts Changing Modem-to-Modem Connection Data Rates Your modem is capable of communicating with other modems at data rates of 300, 1200, 2400, 4800. 7200. 9600. 12000, or 14400 bits per second (bps). When you place a call to another modem, the settings of two AT commands (B and N) and two S-Registers (S37 and S109) are used to determine the data rate of that connection.

  • Page 73: Error Control

    Advanced Modem Concepts Error Control Error control guarantees that data sent and received between your modem and the remote modem arrives with 100% accuracy. This is a much welcomed function since you can never guarantee the quality of the telephone line you are using. Your modem uses the CCITT standard V.42 (pronounced vee-dot 42) and MNP 2–4 error control protocols.

  • Page 74: Data Compression

    Advanced Modem Concepts Data Compression Data compression minimizes the amount of data sent over the telephone line by removing redundant information, thereby compressing the data it receives from the computer. To do this, the modem uses the V.42bis or MNP 5 data compression protocols.

  • Page 75: Modem-To-Computer Flow Control

    Advanced Modem Concepts Modem-to-Computer Flow Control Often, your computer is able to send data to your modem faster than the modem can transmit it across the telephone line. As a result, the modem’s buffer begins to fill with data received from the computer.

  • Page 76: Computer-To-Computer Flow Control

    Advanced Modem Concepts In turn, Modem B can use V.42 or MNP flow control techniques (if using error control), or it can send an XOFF to Modem C to stop data flow (if using modem-to-modem flow control). This is illustrated in link B—C of computer-to-modem flow control in Figure D-2.

  • Page 77: Modem-To-Modem Flow Control

    Advanced Modem Concepts Figure D-2. Various Flow Control Methods Modem-to-Modem Flow Control Finally, flow control can occur between two modems. If Modem B’s buffer begins to fill, and error control is disabled, it can issue an XOFF to Modem C (see modem-to-modem flow control in Figure D-2).
  • Page 78 Glossary Active Profile A nonvolatile configuration area containing the most recently saved configuration options. Any changes made to configuration options can be saved by issuing a &W command. analog signal A type of signal used to transmit data over telephone lines. Answer mode The modem is in a state where it is ready to receive an incoming call.
  • Page 79 Glossary autobaud Modem automatically determines the asynchronous computer data rate when using AT commands. Bell 103J An AT&T Bell standard for 300 bps data transmission. Bell 212A An AT&T Bell standard for 1200 bps data transmission. Bits per second. Indicates the speed at which data is transmitted between devices.
  • Page 80 Glossary Command mode One of two modem operating modes. When in Command mode, the modem accepts commands instead of transmitting or receiving data. See also Data mode . COM port Communications port. A computer’s serial communications port used to transmit to and receive data from a modem. The modem connects directly to this port.
  • Page 81 Glossary data rate The speed at which data is transferred over the telephone line. This rate is measured in bits per second. Data Communications Equipment. A modem. dial command modifiers A modifier used in the dial string that instructs the modem how to process a dialed telephone number.
  • Page 82 Glossary error control A method used by the modem to detect and correct data transmission errors. escape sequence Default setting is +++. This sequence lets you switch your modem from Data mode to Command mode. extended result codes An asynchronous message (in either numbers or words) that includes VF data rate and error control information the modem sends to the computer after executing or trying to execute a command.
  • Page 83 Glossary handshaking The exchange of predetermined codes and signals (tones) to establish a connection between two modems. The handshaking process occurs when the two modems connect, and then spend a brief period deciding how they will transfer data, the speed of the transfer, and if error control will be used.
  • Page 84 Glossary Microcom Networking Protocol. Levels 2—4 of this protocol detect and correct data errors caused by poor telephone line conditions. Level 5 includes data compression. modem MOdulator/DEModulator. A device used to convert data from a digital signal to an analog signal so that data can be transmitted over a telephone line.
  • Page 85 Glossary off-hook A telephone or modem is being used. on-hook A telephone or modem is not being used. Originate mode The modem is in a state where it is ready to transmit a call. In a dial network, it is the modem that makes the call. parity A way of checking data accuracy by counting the number of bits that have a value of one.
  • Page 86 Glossary pulse dialing One of two dialing methods, in which telephone numbers are sent as pulses (brief changes in voltage or current intensity) across the telephone line. Rotary telephones use pulse dialing. register A part of the modem’s memory that contains values that determine the modem’s operating characteristics.
  • Page 87 Glossary S-Registers Registers that contain information affecting the modem parameters. All S-Registers must be preceded by the AT prefix. serial port The serial port is the connection between the PC and its attached modem. synchronous transmission Data transmission that is synchronized by timing signals. Characters are sent at a fixed rate.
  • Page 88 Glossary upload A file transfer in which you send a file to another computer. User Profile 0 A user-defined configuration area containing customized configuration options for a specific application. User Profile 1 A user-defined configuration area containing customized configuration options for a specific application. Volatile This term describes memory which loses its contents when the device is powered down.
  • Page 89 Glossary V.23 A standard for modems operating with asynchronous or synchronous data at 1200 or 600 bps over dial or leased telephone lines V.32 A standard for modems operating full-duplex with asynchronous or synchronous data at 9600 or 4800 bps on dial or leased telephone lines.
  • Page 90 Index Active User Profile, 3-9 answering a call, 3-8 AT Commands. +++ (escape sequence), 3-9, A/ (repeat last command), 4-2 A (answer), 4-2 B (CCITT/Bell Mode), 4-2, D-1 C (carrier control option), 4-2 D (dial), 3-4, 4-3 E (command character echo), F (on-line echo), 4-4 H (hook), 3-7, 4-4 I (identification/Checksum), 4-4...
  • Page 91 Index blind dialing, 4-21 bulletin board system, 1-3, A-1 busy tone, 4-7 Card and Socket Services, 1-3, COM port, 2-3, A-2 command mode, 3-2, 3-3, 3-9 command strings, 3-4 communications software, 1-3 data carrier detect, 4-13, 4-21 data compression, 4-18, 4-19, D-3 data mode, 3-2, 3-9 data rates, GL-7 dial modifiers, 3-5, 4-3...
  • Page 92 Index normal mode, 4-12, A-6 online command mode, 3-2, 3-3 operating modes, 4-12 PBX, 3-6 reliable mode, 4-11, 4-12 removing the modem, 2-2 response codes, 3-2, 3-4, 4-7, C-1 S-Registers, 3-3 S0 (auto-answer ring number), 3-8, 3-14, 4-20 description, 4-1 S1 (Ring Count), 4-20 S10 (loss of carrier disconnect), 4-22...

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Keepintouch 3760-b2

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