® 3COMâ IMPACT ä ISDN EXTERNAL DIGITAL MODEM USER GUIDE A member of the 3Com Impact product family Part No.
3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145 Ó 3Com Corporation, 1995. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.
CONTENTS ABOUT THIS GUIDE Introduction i How to Use This Guide i Conventions ii 1 INTRODUCTION 3Com Impact Digital Modem Features 1-3 Data Capabilities 1-4 Voice Capabilities 1-4 Simultaneous Data and Voice Capabilities 1-4 Analog Modem Capabilities 1-5 3Com Impact Digital Modem Package Contents 1-5 Standard Package Contents 1-5 Additional Contents 1-5 ISDN Digital Line Configuration Requirements 1-6 Computer System Requirements 1-7 IBM PC or Compatible Requirements 1-8 Apple Macintosh Requirements 1-8 Ca
Using the Phone Out Port 2-17 Placing Calls Using the Phone Out Port 2-18 Receiving Calls Using the Phone Out Port 2-18 Protocol Support 2-19 Async-Sync PPP Conversion 2-19 QuickSelect 2-19 3 TROUBLESHOOTING Troubleshooting Tips 3-1 Downloading Firmware to Your External Digital Modem 3-5 A AT COMMAND SET OVERVIEW B AT COMMANDS, REGISTERS, AND RESULT CODES AT Command Set for the 3Com Impact Digital Modem B-1 AT Command Set for Internal Analog Fax Modem Remote S Registers B-7 Digital Modem Result Codes B-1
FIGURES 1-1 Analog and Digital Network Access with the 3Com Impact Digital Modem 1-2 2-1 Back Panel Power Switch and Connectors 2-2 Front Panel LED Indicators 2-1 2-3 Configuration Dialog Box 2-8 2-1
TABLES 1 Text Conventions 2 Notice Icons ii ii 1-1 ISDN Ordering Information by Switch Type 1-2 Pin Descriptions 1-9 2-1 Front Panel LED Indicator Definitions B-1 B-2 B-3 B-4 1-7 2-2 AT Command Set Summary B-1 AT Command Set Summary for the Internal Analog Modem Remote S Registers B-7 3Com Impact Digital Modem Result Codes B-10 B-4
ABOUT THIS GUIDE Introduction This guide describes how to install, operate, and troubleshoot the 3Comâ Impactä ISDN External Digital Modem, referred to throughout this guide as the 3Com Impact digital modem. If the information in the release notes shipped with your product differs from the information in this guide, follow the release notes. Be sure to read the README.TXT or Read Me files on the applicable software utility diskette for the latest product information.
ii ABOUT THIS GUIDE Conventions Table 1 and Table 2 list text and icon conventions that are used throughout this guide: Table 1 Text Conventions Convention Description Text represented as screen display This typeface is used to represent displays that appear on your terminal screen, for example: Text represented as commands This typeface is used to represent commands that you enter, for example: NetLogin: SETDefault !0 -IP NETaddr = 0.0.0.
1 INTRODUCTION The Integrated Services Digital Network (ISDN) is a digital communications standard for supporting voice, data, and video applications through conventional telephone wires. Specifically, ISDN is a method of connecting to the public telephone network using digital technology. ISDN uses the existing copper wire and public telephone network infrastructure.
1-2 CHAPTER 1: INTRODUCTION The 3Com Impact ISDN External Digital Modem (referred to as the 3Com Impact digital modem throughout this guide) is an external, stand-alone ISDN Basic Rate digital modem for connection with digital telephone services from local telephone companies in North America. It is designed for users who require high-speed access to the Internet, on-line information services, or their corporate local area network (LAN).
3Com Impact Digital Modem Features 1-3 The 3Com Impact digital modem can be connected to any compatible ULâ-listed IBM ATâ-compatible or Apple Macintosh personal computer that includes instructions for the installation of hardware and software options to serial ports. 3Com Impact Digital Modem Features The 3Com Impact digital modem provides the following: ■ A complete digital network termination (Basic Rate ISDN NT1).
1-4 CHAPTER 1: INTRODUCTION Data Capabilities The 3Com Impact digital modem allows transmission of asynchronous data at speeds of up to 115.2 Kbps over digital ISDN connections with the highest reliability and error-free performance possible. With Multilink PPP, a digital connection of up to 128 Kbps can be established by aggregating the two 56 Kbps or 64 Kbps ISDN B channels. Note that the COM port speed of your PC limits the maximum data transmission rate to no more than 115.2 Kbps.
3Com Impact Digital Modem Package Contents 1-5 Analog Modem Capabilities The 3Com Impact digital modem (models 3C872 and 3C877) includes an integrated V.32bis analog modem for data or fax transmissions of up to 14.4 Kbps over the ISDN line. V.42bis data compression boosts analog modem throughput to up to 57.6 Kbps. 3Com Impact Digital Modem Package Contents 3Com Impact digital modems are available in Macintosh and PC versions, with or without a built-in V.32bis analog fax modem.
1-6 CHAPTER 1: INTRODUCTION Model 3C872 ■ ■ ■ One copy of TurboCom Windows software One copy of Delrinaâ WinCommä Lite and WinFaxâ Lite communications software One DB-9-to-DB-25 serial connection adapter ISDN Digital Line Configuration Requirements The 3Com Impact digital modem requires an ISDN digital telephone line that is properly configured for use with the digital modem.
Computer System Requirements 1-7 Table 1-1 ISDN Ordering Information by Switch Type ISDN Switch Type AT&Tâ 5ESS Custom AT&T 5ESS National ISDN-1 Northern Telecomâ DMS100 National ISDN-1 Siemensâ EWSD National ISDN-1 Line Code 2B1Q (no NT1 required) 2B1Q (no NT1 required) 2B1Q (no NT1 required) 2B1Q (no NT1 required) Directory Numbers 1* 1* 2 1* Channels 2B alternate 2B alternate 2B alternate 2B alternate circuit-switched circuit-switched circuit-switched circuit-switched data and voice dat
1-8 CHAPTER 1: INTRODUCTION IBM PC or Compatible Requirements An IBM-compatible PC must have the following: ■ A 386, 486, or Pentiumâ processor ■ An available serial communications port For sustained performance at higher data rates (57.6 Kbps and 115.2 Kbps), it is recommended that your IBM or IBMcompatible PC serial COM port be equipped with a 16C550 UART (universal asynchronous receiver/transmitter).
Cabling Requirements 1-9 Cabling Requirements Cables to connect the 3Com Impact digital modem to your computer are provided. For IBM or IBM-compatible PCs with a 25-pin serial port, a DB-9–to–DB-25 connection adapter is included with the digital modem. The asynchronous RS-232-C port on the digital modem, labeled Computer, is a standard DB-9 female connector. The digital modem asynchronous port pin assignments, shown in Table 1-2, conform to standard definitions for data communications equipment (DCE).
2 INSTALLING AND CONFIGURING THE DIGITAL MODEM This chapter describes installation and configuration of the 3Com Impact digital modem. In combination with the instructions given in this chapter, follow the instructions given in the appropriate PC or Macintosh computer user guide. Refer to Figure 2-1 and Figure 2-2, showing the digital modem back and front panels, during installation and configuration. If you encounter difficulties after installation, refer to Chapter 3, “Troubleshooting.
2-2 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM Table 2-1 Front Panel LED Indicator Definitions LED Color Description Power Yellow Power Indicator. Lit when power is on and remains lit as long as power is available from the ac wall transformer plugged into the electrical outlet. Test Yellow Self-Test/Status. Flashes when the digital modem is executing its power-up self-test or a user-initiated reset. If the results of the self-test or reset are normal, the LED goes off.
Installing the 3Com Impact Digital Modem 2-3 Installing the 3Com Impact Digital Modem This installation procedure assumes that you are familiar with IBM and IBM-compatible or Apple Macintosh computers. If you are not, refer to the user guide that accompanied your computer for instructions on hardware installation and operating system commands.
2-4 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM 7 Connect the RJ-45 (8-pin) connector end of the RJ-45/RJ-11 ISDN cable to the RJ-45 connector labeled Wall on the digital modem’s back panel. See Figure 2-1 for the location of the RJ-45 connector on the digital modem’s back panel. 8 Connect the RJ-11 (6-pin) connector end of the RJ-45/RJ-11 ISDN cable to the RJ-11 ISDN wall jack.
Installing the 3Com Impact Digital Modem 2-5 3 Insert the 9-pin male end of the 3Com Impact digital modem-to-Macintosh serial signal cable into the connector labeled Computer on the digital modem’s back panel and tighten the connector screws. 4 Connect the other end of the 3Com Impact digital modem-to-Macintosh serial signal cable to the serial communications port on the back of the Macintosh.
2-6 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM 9 Turn on the 3Com Impact digital modem by toggling the power switch on the back panel to the On position. See Figure 2-1 for the location of the power switch on the digital modem’s back panel. The indicator LEDs on the front panel (see Figure 2-2) flash momentarily as the unit undergoes a power-up self-test diagnostic. 10 Turn on the computer’s power switch and restart.
Configuring the 3Com Impact Digital Modem 2-7 After you configure the digital modem and verify that it is working properly, you should install the TurboCom software. Refer to the installation instructions that came with the TurboCom software. This software is required only for IBM PC or compatible computers running Windows 3.X.
2-8 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM Click Connect. The 3Com Impact Configuration dialog box appears, as shown in Figure 2-3.
Configuring the 3Com Impact Digital Modem 2-9 5 Select the type of switch, as specified by your telephone company, from the Telephone Company Switch drop-down list box. 6 Click in the Telephone Number field in the Number 1 area and enter the telephone number to which your digital modem is connected. 7 Click in the Service Profile Identifier (SPID) field and enter the corresponding SPID for the telephone number you entered in the previous step.
2-10 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM 12 If you have changed the Telephone Company Switch type, you must reset the digital modem by turning the power switch off and then on. 13 Verify the configuration. Check the status bar (located beneath the Help, Tools, Configure, and Exit buttons of the Configuration dialog box) to verify correct configuration.
Configuring the 3Com Impact Digital Modem 2-11 Copy the files to a new DOS directory. For example, to create a directory dddd on your C drive at the C:\> DOS prompt, type: md c:\dddd To copy all files from the diskette to a directory \dddd at the A:\> DOS prompt, type: copy a:*.* c:\dddd 2 Execute INSTALL from the hard drive. At the C:\> DOS prompt, type: INSTALL The configuration program launches and presents the Port Settings screen.
2-12 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM 6 Enter the corresponding Service Profile Identifier (SPID) in the SPID #1 field for the telephone number you entered in the previous step. You should have received this SPID from your telephone company. CAUTION: If the ISDN line has been configured with only one telephone number (Point-to-Point), do not include the SPID. 7 Specify which device should receive the calls coming to Phone #1. You can select Phone Port or Internal Fax/Modem.
Configuring the 3Com Impact Digital Modem 2-13 12 Reset the digital modem by turning the power switch off and then on again. If the parameters match those registered at the telephone company ISDN switch, the D channel LED lights for a few minutes, flashes for several seconds, and then turns off. If the LED continues to flash or remains lit, see Chapter 3, “Troubleshooting.” 13 Press [Esc] to return to the main menu. Once in the main menu, exit the program.
2-14 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM You should have received this SPID from your telephone company. CAUTION: If the ISDN line has been configured with only one telephone number (Point-to-Point), do not include the SPID. 5 Specify which device should receive the calls coming to Phone Number 1. You can select Phone Port or Internal Fax/Modem. If your model has the internal analog fax modem (Models 3C872 and 3C877), you can select both.
Placing and Receiving Calls 2-15 Placing and Receiving Calls This section illustrates how to place and receive a variety of calls with your 3Com Impact digital modem. The digital modem uses AT commands and S registers for call management. See Appendix A, “AT Command Set Overview,” for instructions on use of the AT command set, and Appendix B, “AT Commands, Registers, and Result Codes,” for a tabular summary of the AT command lines.
2-16 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM By default, the 3Com Impact digital modem dials the same number for both Multilink PPP channels. If the destination to which the digital modem is dialing to establish a second Multilink PPP channel requires a different telephone number, then this second telephone number is stored in register S81. By default, this register is empty. It must be configured before you establish each Multilink PPP call.
Using the Phone Out Port 2-17 Placing Analog Modem Calls To place a call from your PC or Macintosh using the optional V.32bis 14.4 Kbps internal analog fax modem (included with models 3C872 and 3C877), use the AT command ATDT (for connection to an analog modem using touch-tone dialing) or ATDP (for connection to an analog modem using pulse dialing).
2-18 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM CAUTION: The 3Com Impact digital modem is designed to operate with telephones that are compatible with the original AT&T 2500 touch-tone telephone standard. 3Com guarantees proper operation of up to three compatible touch-tone devices on the Phone Out port. The digital modem is designed to provide power and ringing for these three devices on up to 100 feet of AWG 26 or heavier AWG wiring.
Protocol Support 2-19 Protocol Support Async-Sync PPP Conversion One of the most unique and powerful features of the 3Com Impact digital modem is its ability to convert asynchronous Point-to-Point Protocol (PPP) into synchronous (HDLC-based) PPP that can be transported in ISDN B channels to communications servers and routers that have integrated ISDN Basic Rate (BRI), Primary Rate (PRI), or T1 access lines.
3 TROUBLESHOOTING This chapter explains how to isolate and solve simple problems encountered with the 3Com Impact digital modem. Problems may stem from incorrect option settings or improper installation. Follow the steps outlined in this chapter. There are no user-serviceable parts inside your 3Com Impact digital modem. Unauthorized opening of the unit will void the warranty.
3-2 CHAPTER 3: TROUBLESHOOTING The 3Com Impact digital modem will not operate if connected to an analog telephone wall jack. Make sure that the digital modem is connected directly into the ISDN wall outlet without connection to any intermediate telephone equipment (an NT1 device is not required with this digital modem). 4 Make sure that the cables provided by 3Com or a 3Com authorized reseller are in good condition and show no evidence of wear or other physical damage.
Troubleshooting Tips 3-3 Check the Service Profile Identifier (SPID) entry and the Phone# information in the digital modem software configuration utility. If you have verified once again that your SPID and Phone# parameters are entered properly and the D channel LED continues to flash without going out, call your telephone company, verify that you have been given the correct SPID and Phone# information, and ask whether the ISDN line is Point-to-Point.
3-4 CHAPTER 3: TROUBLESHOOTING ■ If you are unable to establish a data call, carefully monitor the B-1 and B-2 LEDs while attempting a data call. The B-1 and B-2 LEDs flash green during the data call establishment phase. They then remain continuously green once the data connection is established.
Downloading Firmware to Your External Digital Modem 3-5 8 If problems persist, refer to Appendix C, “Technical Support.” If you have gone through the troubleshooting tips and still have not been able to resolve the problem, contact technical support. Please have the serial number of your 3Com Impact digital modem; a list of symptoms, including any LED status information; computer display status; and relevant information about your application software ready when you call.
3-6 CHAPTER 3: TROUBLESHOOTING 6 Select the firmware file that you copied from 3Com’s FTP site and click OK to start the download to the 3Com Impact digital modem. The download will take several minutes. 7 Click the Exit button to exit the utility. For Macintosh Computers This section provides instructions on downloading firmware from your Macintosh to your digital modem. 1 Obtain the latest firmware file from the 3Com FTP site ftp.3Com.com. 2 Copy the firmware file to your computer.
A AT COMMAND SET OVERVIEW Most communications software supports an AT command line initialization string. The initialization string sets up the 3Com Impact digital modem to negotiate and connect with a remote modem. Before dialing, the software sends the initialization string to the 3Com Impact digital modem. The communications software or server stores the initialization string and uses it each time it dials.
A-2 APPENDIX A: AT COMMAND SET OVERVIEW Follow these steps to use AT commands: 1 Launch your communications software. Be sure your communications software is in terminal mode. 2 Be sure the digital modem is in command mode (sometimes called local mode or terminal mode) so that it interprets your commands. When your computer is powered on, the digital modem automatically starts in command mode.
B AT COMMANDS, REGISTERS, AND RESULT CODES The 3Com Impact ISDN digital modem commands are summarized in Table B-1, modem commands for the internal analog modem in Table B-1, remote S registers in Table B-3, and digital modem result codes in Table B-4. AT Command Set for the 3Com Impact Digital Modem Table B-1 summarizes the AT command set. Table B-1 AT Command Set Summary Command Function (Example) Description A Answer incoming circuit-switched digital modem call (AT A) Answers an incoming call.
B-2 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES Table B-1 AT Command Set Summary (continued) Command Function (Example) Description &D &D0 causes digital modem to ignore DTR from host. DTR control (AT &D0) &D1 causes digital modem to enter command state on detecting on-off transition of DTR. &D2 causes digital modem to hang up current calls upon on-off transition of DTR and prepares serial port to accept AT command at any speed (default).
AT Command Set for the 3Com Impact Digital Modem B-3 Table B-1 AT Command Set Summary (continued) Command Function (Example) Description \S Read on-line status: command settings (AT \S) Reads the status of any parameters that have been modified through AT commands. \T Link inactivity timer (AT \T1) \T0 disables inactivity timer (default). \Tn link inactivity timer in minutes. The digital modem automatically disconnects the call if no activity is sensed within n (n = 0–255) minutes.
B-4 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES AT Command Set for Internal Analog Fax Modem Table B-1 summarizes the AT command set for the internal analog modem. Table B-2 AT Command Set Summary for the Internal Analog Modem Command Function (Example) Description B Initiates calls using either ITU-T V.220 or Bell 212a at 1200 bps. Set 1200 bps (operation= 0) 0 — V.22 1 — Bell 212a (default) C1 ATC1 F Select modem modulation mode 0 — Auto detect (default) Modem responds with OK 1 — V.
AT Command Set for Internal Analog Fax Modem B-5 Table B-2 AT Command Set Summary for the Internal Analog Modem (continued) Command Function (Example) Description X 0 — Basic call progress Select the subset of result messages that will be used by the modem to inform the PC of the results of commands 1 — Basic call progress and connection rate 2 — Basic call progress and connection rate 3 — Basic call progress and connection rate 4 — All call progress and connection rate %E Line quality monitor cont
B-6 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES Table B-2 AT Command Set Summary for the Internal Analog Modem (continued) Command Function (Example) Description \N 0 — Normal speed buffered Set preferred error-correcting mode to be negotiated in a subsequent data connection 1 — Direct 2 — Reliable link 3 — Auto reliable 4 — Force LAPM 5 — Force MNP -K MNP extended services Enables/disables conversion of a V.42 LAPM connection to an MNP 10 connection.
Remote S Registers B-7 Remote S Registers The 3Com Impact digital modem supports the S registers listed in Table B-3. All S registers except S0 are the 3Com extended registers.
B-8 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES Table B-3 Remote S Registers (continued) Registers Descriptions S58 Terminal Initialization State: Indicates the status of the second TEI using SPID 2. This information is provided only if your carrier requires a second directory number. This field is read-only.
Remote S Registers B-9 Table B-3 Remote S Registers (continued) Registers Descriptions S70 Dynamic Bandwidth Allocation: 0 — DBA disabled 1 — DBA enabled (default) S71 B Channel Protocol: 0 — QuickSelect (default) 1 — Async-Sync PPP conversion 2 — V.120 S73 V.120 Frame Type: 0 — I frame (default) 1 — UI frame S74 V.
B-10 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES Digital Modem Result Codes Table B-4 lists the 3Com Impact digital modem result codes. Table B-4 3Com Impact Digital Modem Result Codes Short Form Long Form Meaning 0 OK Indicates that the most recent command or action was successfully completed. 2 RING Indicates that an incoming call is present and no AT Answer command is outstanding.
C TECHNICAL SUPPORT 3Com provides easy access to technical support information through the variety of services described in this appendix. On-line Technical Services 3Com offers worldwide support, through the following: ■ ■ ■ ■ 3Com Bulletin Board Service (3ComBBS) World Wide Web Site Ask3ComSM on CompuServeâ 3ComFactsSM Automated Fax Service 3Com Bulletin Board Service 3ComBBS contains patches, software, and drivers for all 3Com products, as well as technical articles.
C-2 APPENDIX C: TECHNICAL SUPPORT World Wide Web Site Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser: http://www.3Com.com/ This service features news and information about 3Com products, customer service and support, 3Com’s latest news releases, selected articles from 3TECHâ, 3Com’s award-winning technical journal, and more.
Support from Your Network Supplier ■ C-3 NetFacts provides data sheets and technical articles on 3Com Corporation’s hub, bridge, router, terminal server, and software products. Document 8888 provides you with an index of system product documents. Call 3ComFacts using your touch-tone telephone. International access numbers are: Country Fax Number Hong Kong (852) 537 5610 U.K. (44) (144) 227 8279 U.S.
C-4 APPENDIX C: TECHNICAL SUPPORT Support from 3Com If you are unable to receive support from your network supplier, technical support contracts are available from 3Com. In the U.S. and Canada, call (800) 876 3266 for customer service. Returning Products for Repair A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense.
LIMITED WARRANTY HARDWARE: 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Internetworking products Network adapters Ethernet stackable hubs and unmanaged Ethernet fixed port repeaters *Power supply and fans in these stackable hubs and unmanaged repeaters Other hardware products Spare parts and spares kits One year Lifetime Lifetime* (One
WARRANTIES EXCLUSIVE: IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER’S SOLE REMEDY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE PAID, AT 3COM’S OPTION. THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
FCC CLASS B CERTIFICATION STATEMENT 3Com Corporation Model Nos: 3C871, 3C872, 3C876, 3C877 FCC ID: LP2QAREMOTE Made in U.S.A. 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, and 2 this device must accept any interference received, including interference that may cause undesired operation.
CANADIAN NOTICE The Industry Canada label identifies certified equipment. This certification means that the equipment meets certain telecommunications network protective, operation, and safety requirements. The Department does not guarantee the equipment will operate to the users’ satisfaction. Before installing this equipment, users should ensure that is permissible to be connected to the facilities of the local telecommunications company.
