3Com DIGITAL MODEM manual

® 3C OM â I MP A CT ä ISDN E XTERNAL D IGIT AL M ODEM U SER G UIDE A member of the 3Com Impact product family Part No. 09-0699-002 Published August 1995[...]

3Com C orporation ■ 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 an y means or used to make any derivativ e work (such as translation, transformation, or adaptation) without permission from 3Com C orporation. 3Com Co[...]

C ONTENTS A BOUT T HIS G UIDE Introduction i How to Use This Guide i Con ventions ii 1 I NTRODUCTION 3Com Impact Digital Modem F eatures 1-3 Data Capabilities 1-4 V oice Capabilities 1-4 Simultaneous Data and Voice C apabilities 1-4 Analog Modem Capabilities 1-5 3Com Impact Digital Modem P ackage Contents 1-5 Standard P ackage Contents 1-5 Addition[...]

Using the Phone Out P ort 2-17 Placing Calls Using the P hone Out P or t 2-18 Receiving Calls Using the Phone Out P or t 2-18 Prot ocol Support 2-19 Async-Sync PPP C onversion 2-19 QuickSelect 2-19 3 T ROUBLESHOOTING T roubleshooting Tips 3-1 Downloading F irmware to Y our External Digital Modem 3-5 A AT C OMMAND S ET O VERVIEW B AT C OMMANDS , R E[...]

F IGURES 1-1 Analog and Digital Network Access with the 3Com Impact Digital Modem 1-2 2-1 Back P anel P ower Swit ch and Connectors 2-1 2-2 Fr ont P anel LED Indicators 2-1 2-3 Configuration Dialog Box 2-8[...]

T ABLES 1 T ext Con ventions ii 2 Notice Icons ii 1-1 ISDN Ordering Information b y Switch T ype 1-7 1-2 Pin Descriptions 1-9 2-1 Fr ont P anel LED Indicator Definitions 2-2 B-1 A T Command Set Summar y B-1 B-2 A T Command Set Summary for the Internal Analog Modem B-4 B-3 Remote S Registers B-7 B-4 3Com Impact Digital Modem Result Codes B-10[...]

A BOUT T HIS G UIDE Introduction This guide describes how to install, operate , and troubleshoot the 3Com â Impact ä ISDN External Digital Modem, ref erred to throughout this guide as the 3C om Impact digital modem. If the information in the release notes shipped with your product differs from the information in this guide , follow the release no[...]

ii A BOUT T HIS G UIDE C on ven tions T able 1 and T able 2 list text and icon conventions that are used throughout this guide: T able 1 T ext Conventions Convention Description Text represented as screen display This typeface is used to represent displays that appear on your terminal screen, for example: NetLogin: Text represented as commands This[...]

1 I NTRODU CTION The Integrated Services Digital Network (ISDN) is a digital communications standard for supporting voice, data, and video applications through conv entional telephone wires. Specifically , ISDN is a method of connec ting to the public telephone network using digital technology . ISDN uses the existing copper wire and public teleph[...]

1-2 C HAPTER 1: I NTRODUCTION The 3Com Impact ISDN External Digital Modem (referred t o as the 3Com Impact digital modem throughout this guide) is an external, stand-alone ISDN Basic Rate digital modem for connection with digital telephone ser vices from local telephone companies in Nor th America. I t is designed for users who require high-speed a[...]

3Com Impact Digital Modem Features 1-3 The 3Com Impact digital modem can be connected to any compatible UL â -listed IBM A T â -compatible or Apple Macintosh personal computer that includes instructions for the installation of hardware and software options to serial ports. 3C om Impact Digital Modem F eatures The 3Com Impact digital modem provide[...]

1-4 C HAPTER 1: I NTRODUCTION Data Capabilities The 3Com Impact digital modem allows transmission of asynchronous data at speeds of up to 115.2 Kbps ov er digital ISDN connections with the highest reliabilit y and error-free per formance possible. With Multilink PPP , a digital connec tion of up to 128 Kbps can be established by aggregating the two[...]

3Com Impact Digital Modem Package Contents 1-5 Analog Modem Capabilities The 3Com Impact digital modem (models 3C872 and 3C877) includes an integrated V .32 bis analog modem for data or fax transmissions of up to 14.4 Kbps over the ISDN line . V .42 bis data compression boosts analog modem throughput to up to 57.6 Kbps. 3C om Impact Digital Modem P[...]

1-6 C HAPTER 1: I NTRODUCTION Model 3C872 ■ One copy of T urboCom Windows software ■ One copy of Delrina â WinComm ä Lite and WinF ax â Lite communications software ■ One DB-9-to-DB-25 serial connection adapter ISDN Digital Line C onfigura tion Requirements The 3Com Impact digital modem requires an ISDN digital telephone line that is prop[...]

Computer System Requirements 1-7 C omputer S ystem Requir ements * Two directory numbers are required for Models 3C872 and 3C877. This allows a voice call and a call using the internal analog fax modem to occur at the same time. Connect the model 3C871 or 3C872 3Com Impact digital modem to an IBM-compatible computer . Connect the model 3C876 or 3C8[...]

1-8 C HAPTER 1: I NTRODUCTION IBM PC or C ompatible Requirements An IBM-compatible PC must have the f ollowing: ■ A 386, 486, or Pentium â pr ocessor ■ An available serial communications port F or sustained performance at higher data rates (57.6 Kbps and 115.2 Kbps), it is recommended that y our IBM or IBM- compatible PC serial C OM por t be e[...]

Cabling Requirements 1-9 Cabling Requir ements Cables to connect the 3Com Impact digital modem to your computer are pro vided. For IBM or IBM-compatible PCs with a 25-pin serial por t, 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[...]

2 I NST ALLING AND C ONFIGURING THE D IGIT AL M ODEM 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 Macint osh computer user guide. Refer to F igure 2-1 and Figure 2-2, showing the digital mod[...]

2-2 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM T able 2-1 Fr ont Panel LED Indicat or Definitions LED Color Description Power Yellow Po wer Indicat or . 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-T est/Status. Flashes when th[...]

Installing the 3Com Impact Digital Modem 2-3 Installing the 3C om Impact Digital Modem This installation procedure assumes that y ou are familiar with IBM and IBM-compatible or Apple Macintosh computers. If you are not, refer t o the user guide that accompanied your computer f or instructions on hardware installation and operating system commands. [...]

2-4 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM 7 Connect the RJ-45 (8-pin) connector end of the RJ-45/RJ-11 ISDN cable to the RJ-45 connector labeled W all on the digital modem’ s back panel. See F igure 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 o[...]

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[...]

2-6 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM 9 T urn on the 3Com Impact digital modem by toggling the power swit ch on the back panel to the On position. See F igure 2-1 for the location of the power swit ch on the digital modem ’ s back panel. The indicator LEDs on the front panel (see F igure 2-2) flash momentarily as the u[...]

Configuring the 3Com Impact Digital Modem 2-7 After you configur e the digital modem and verify that it is working properly , you should install the T urboCom software. Refer to the installation instructions that came with the T urboCom soft ware . This softwar e is required only for IBM PC or compatible computers running Windows 3.X. C onfigurat[...]

2-8 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM Click Connect. The 3C om Impact Configuration dialog box appears , as shown in Figure 2-3. Figure 2-3 C onfiguration Dialog Box A status bar below the Help , T ools, Configure , and Exit buttons provides the f ollowing ISDN status information: ■ Layer 1 status ■ Ser vice Profi[...]

Configuring the 3Com Impact Digital Modem 2-9 5 Select the t ype of switch, as specified by your telephone company , from the T elephone Company Swit ch drop-down list bo x. 6 Click in the T elephone Number field in the Number 1 area and enter the telephone number to which y our digital modem is connected. 7 Click in the Ser vice Profile Identi?[...]

2-10 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM 12 If you ha ve changed the T elephone Company S witch type , you must reset the digital modem b y turning the power switch off and then on. 13 V erify the configuration. Check the status bar (located beneath the Help , T ools, Configure , and Exit buttons of the Configuration dia[...]

Configuring the 3Com Impact Digital Modem 2-11 Copy the files to a new DOS dir ector y . F or example, to create a director y dddd on your C drive at the C:> DOS prompt , t ype: md c:dddd T o copy all files from the diskette to a directory dddd at the A:> DOS prompt, type: copy a:*.* c:dddd 2 Execute INST ALL from the hard driv e. At t[...]

2-12 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM 6 Enter the corresponding Service Profile Identifier (SPID) in the SPID #1 field for the telephone number y ou entered in the previous step . Y ou should have r eceived this SPID from y our telephone company . CAUTION: If the ISDN line has been configured with only one telephone [...]

Configuring the 3Com Impact Digital Modem 2-13 12 Reset the digital modem by turning the pow er switch off and then on again. If the parameters match those register ed 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, se[...]

2-14 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM Y ou should have r eceived this SPID from y our telephone company . CAUTION: If the ISDN line has been configured with only one telephone number (Point-to-P oint), do not include the SPID. 5 Specify which device should receiv e the calls coming to Phone Number 1. Y ou can select Pho[...]

Placing and Receiving Calls 2-15 Placing and Receiving C alls This section illustrates how to place and receiv e a variety of calls with your 3Com Impact digital modem. The digital modem uses A T commands and S registers for call management. See Appendix A, “ A T Command Set Over view ,” for instructions on use of the A T command set, and Appen[...]

2-16 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM By default, the 3Com Impact digital modem dials the same number for both Multilink PPP channels. I f the destination to which the digital modem is dialing to establish a second Multilink PPP channel requires a diff erent telephone number , then this second telephone number is stored [...]

Using the Phone Out Port 2-17 Placing Analog Modem Calls T o place a call from your PC or Macintosh using the optional V .32 bis 14.4 Kbps internal analog fax modem (included with models 3C872 and 3C877), use the A T command A TDT (for connection to an analog modem using touch-tone dialing) or A TDP (for connection to an analog modem using pulse di[...]

2-18 C HAPTER 2: I NSTALLING AND C ONFIGURING THE D IGITAL M ODEM CAUTION: The 3Com Impact digital modem is designed to operate with telephones that ar e compatible with the original A T&T 2500 touch-tone telephone standard. 3Com guarantees proper oper ation of up to three compatible touch-tone devices on the Phone Out port. The digital modem i[...]

Protocol Support 2-19 Pr otocol Support Async-S ync PPP Con version One of the most unique and powerful features of the 3Com Impact digital modem is its ability to convert asynchronous P oint-to-P oint Protocol (PPP) into synchronous (HDL C-based) PPP that can be transpor ted in ISDN B channels to communications servers and routers that have integr[...]

3 T ROUBLESHOOTIN G This chapter explains how to isolat e and solve simple problems encountered with the 3C om Impact digital modem. Problems may st em from incorrect option settings or improper installation. F ollow the steps outlined in this chapter . There are no user-serviceable parts inside your 3Com Impact digital modem. Unauthorized opening [...]

3-2 C HAPTER 3: T ROUBLESHOOTIN G 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 cabl[...]

Troubleshooting Tips 3-3 Check the Ser vice Profile Identifier (SPID) entry and the Phone# information in the digital modem software configuration utility . If you have v erified once again that your SPID and Phone# parameters are enter ed properly and the D channel LED continues to flash without going out, call your telephone company , verify[...]

3-4 C HAPTER 3: T ROUBLESHOOTIN G ■ 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. ■ If neither of the B-1 or B-2 LEDs flashes[...]

Downloading Firmware to Your External Digital Modem 3-5 8 If problems persist, refer to Appendix C, “ T echnical Suppor t.” If you have gone thr ough the troubleshooting tips and still have not been able t o resolve the problem, contact technical support. Please have the serial number of y our 3Com Impact digital modem; a list of symptoms, incl[...]

3-6 C HAPTER 3: T ROUBLESHOOTIN G 6 Select the firmware file that you copied from 3C om ’ 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 . F or Macintosh C omputers This section provides instructions on downloading firmware from[...]

A AT C OMMAND S ET O VERVIEW Most communications software suppor ts an A T command line initialization string. T he 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 s[...]

A-2 A PPENDIX A: AT C OMMAND S ET O VERVIEW F ollow these steps to use A T commands: 1 Launch your communica tions 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 y our commands. When your computer is pow ered on,[...]

B AT C OMMANDS , R EGISTERS , AND R ESUL T C ODES The 3Com Impact ISDN digital modem commands are summarized in T able B-1, modem commands for the internal analog modem in T able B-1, remote S r egisters in T able B-3, and digital modem result codes in T able B-4. A T C ommand Set for the 3C om Impac t Digital Modem T able B-1 summarizes the A T co[...]

B-2 A PPENDIX B: AT C OMMANDS , R EGISTERS , AND R ESULT C ODES &D DTR control (AT &D0) &D0 causes digital modem to ignore DTR from host. &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 [...]

AT Command Set for the 3Com Impact Digital Modem B-3 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[...]

B-4 A PPENDIX B: AT C OMMANDS , R EGISTERS , AND R ESULT C ODES A T C ommand Set for In ternal Analog F ax Modem T able B-1 summarizes the A T command set for the internal analog modem. T able B-2 A T Command Set Summary for the Internal Analog Modem Command Function (Example) Description B Set 1200 bps (operation= 0) Initiates calls using either I[...]

AT Command Set for Internal Analog Fax Modem B-5 X Select the subset of result messages that will be used by the modem to inform the PC of the results of commands 0 — Basic call progress 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[...]

B-6 A PPENDIX B: AT C OMMANDS , R EGISTERS , AND R ESULT C ODES N Set preferred error-correcting mode to be negotiated in a subsequent data connection 0 — Normal speed buffered 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[...]

Remote S Registers B-7 Remote S Registers The 3Com Impact digital modem supports the S registers listed in T able B-3. All S registers except S0 are the 3C om extended registers. T able B-3 Remote S Registers Registers Descriptions S0 Auto Answer 0 — Disabled (default) 1 — Enabled S50 ISDN Switch Signaling Type: 1 — AT&T 5ESS Custom 3 —[...]

B-8 A PPENDIX B: AT C OMMANDS , R EGISTERS , AND R ESULT C ODES 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. 0 — 3Com Impact digital modem has not attempted initialization 1 — 3Com Impact digi[...]

Remote S Registers B-9 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.120 Maximum Frame Size (range 240–256): 256 — Maximum frame size of 256 is used[...]

B-10 A PPENDIX B: AT C OMMANDS , R EGISTERS , AND R ESULT C ODES Digital Modem Result C odes T able B-4 lists the 3Com Impact digital modem result codes. T able 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 c[...]

C T ECHNICAL S UPPORT 3Com pro vides easy access to technical support information through the variety of services described in this appendix. On-line T echnical Ser vices 3Com off ers worldwide support, through the following: ■ 3Com Bulletin Board Service (3ComBBS) ■ W orld Wide W eb Site ■ Ask3Com SM on C ompuSer ve â ■ 3ComF acts SM Auto[...]

C-2 A PPENDIX C: T ECHNICAL S UPPORT W orld Wide W eb Site Access the latest netw orking information on 3Com ’ s W orld Wide Web site by ent ering our URL into your Internet browser: http://www.3Com.com/ This service features news and information about 3Com products, customer ser vice and suppor t, 3Com ’ s latest news releases, selected ar tic[...]

Support from Your Network Supplier C-3 ■ NetF ac ts provides data sheets and technical articles on 3Com C orporation ’ s hub, bridge, router , terminal ser ver , and software products. Document 8888 provides you with an index of system product documents. Call 3ComF acts using your touch-tone telephone . International access numbers are: Local a[...]

C-4 A PPENDIX C: T ECHNICAL S UPPORT Suppor t from 3C om If you are unable to r eceive support from your network supplier , technical suppor t contrac ts are av ailable from 3Com. In the U.S. and Canada, call (800) 876 3266 for customer service. Returning Pr oducts for Repair A product sent directly to 3Com for r epair must first be assigned a Ret[...]

LIMITED W ARRANTY HARDW ARE: 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 One year Network adapters Lifetime Ethernet stackable hubs and unmanaged Ether[...]

W ARR ANTIES EXCL USIVE: 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, STATU[...]

FCC CLASS B C ERTIFICATION 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 [...]

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 ensur[...]