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3Com DIGITAL MODEM User Manual

Manual is about: 3Com USER GUIDE DIGITAL MODEM

Summary of DIGITAL MODEM

  • Page 1

    ® 3c om â i mpact ä isdn e xternal d igital m odem u ser g uide a member of the 3com impact product family part no. 09-0699-002 published august 1995.

  • Page 2

    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 pe...

  • Page 3: Ontents

    C ontents a bout t his g uide introduction i how to use this guide i conventions ii 1 i ntroduction 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 content...

  • Page 4: At C

    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 t roubleshooting troubleshooting tips 3-1 downloading firmware to your external digital modem 3-5 a at c omm...

  • Page 5: Igures

    F igures 1-1 analog and digital network access with the 3com impact digital modem 1-2 2-1 back panel power switch and connectors 2-1 2-2 front panel led indicators 2-1 2-3 configuration dialog box 2-8.

  • Page 6: Ables

    T ables 1 text conventions ii 2 notice icons ii 1-1 isdn ordering information by switch type 1-7 1-2 pin descriptions 1-9 2-1 front panel led indicator definitions 2-2 b-1 at command set summary b-1 b-2 at command set summary for the internal analog modem b-4 b-3 remote s registers b-7 b-4 3com impa...

  • Page 7: Bout

    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, 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 info...

  • Page 8: Conventions

    Ii a bout t his g uide 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: ...

  • Page 9: Ntroduction

    1 i ntroduction 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 use...

  • Page 10

    1-2 c hapter 1: i ntroduction 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 ...

  • Page 11

    3com impact digital modem features 1-3 the 3com impact digital modem can be connected to any compatible ul â -listed ibm at â -compatible or apple macintosh personal computer that includes instructions for the installation of hardware and software options to serial ports. 3com impact digital modem f...

  • Page 12: Data Capabilities

    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 over digital isdn connections with the highest reliability and error-free performance possible. With multilink ppp, a digital connection of up to 128 k...

  • Page 13: Analog Modem Capabilities

    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 ...

  • Page 14

    1-6 c hapter 1: i ntroduction model 3c872 ■ one copy of turbocom windows software ■ one copy of delrina â wincomm ä lite and winfax â 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...

  • Page 15: Computer System Requirements

    Computer system requirements 1-7 computer system requirements * 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-compa...

  • Page 16: Apple Macintosh Requirements

    1-8 c hapter 1: i ntroduction ibm pc or compatible requirements an ibm-compatible pc must have the following: ■ a 386, 486, or pentium â 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 i...

  • Page 17: Cabling Requirements

    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 m...

  • Page 18: Nstalling

    2 i nstalling and c onfiguring the d igital 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 macintosh computer user guide. Refer to figure...

  • Page 19

    2-2 c hapter 2: i nstalling and c onfiguring the d igital m odem 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. Tes...

  • Page 20

    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 hardwar...

  • Page 21: Computer

    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 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 ...

  • Page 22

    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-...

  • Page 23

    2-6 c hapter 2: i nstalling and c onfiguring the d igital m odem 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 (se...

  • Page 24

    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 c...

  • Page 25

    2-8 c hapter 2: i nstalling and c onfiguring the d igital m odem click connect. The 3com impact configuration dialog box appears, as shown in figure 2-3. Figure 2-3 configuration dialog box a status bar below the help, tools, configure, and exit buttons provides the following isdn status information...

  • Page 26

    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....

  • Page 27

    2-10 c hapter 2: i nstalling and c onfiguring the d igital m odem 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...

  • Page 28

    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 i...

  • Page 29

    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 you entered in the previous step. You should have received this spid from your telephone company. Caution: if the isdn line has ...

  • Page 30

    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 ...

  • Page 31

    2-14 c hapter 2: i nstalling and c onfiguring the d igital m odem 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 co...

  • Page 32: Placing and Receiving Calls

    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 o...

  • Page 33

    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. If the destination to which the digital modem is dialing to establish a second multilink ppp channel requires a different telephone numbe...

  • Page 34: Placing Analog Modem Calls

    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 ...

  • Page 35

    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 are compatible with the original at&t 2500 touch-tone telephone standard. 3com guarantees proper operation of up to three compatible touch-tone devices...

  • Page 36: Protocol Support

    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 communic...

  • Page 37: Roubleshooting

    3 t roubleshooting 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...

  • Page 38

    3-2 c hapter 3: t roubleshooting 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 wi...

  • Page 39

    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 ...

  • Page 40

    3-4 c hapter 3: t roubleshooting ■ 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. ...

  • Page 41: Modem

    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...

  • Page 42

    3-6 c hapter 3: t roubleshooting 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 ins...

  • Page 43: At C

    A at c ommand s et o verview 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 d...

  • Page 44

    A-2 a ppendix a: at c ommand s et o verview 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...

  • Page 45: At C

    B at c ommands , r egisters , and r esult c odes 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 digita...

  • Page 46

    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...

  • Page 47

    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 d...

  • Page 48

    B-4 a ppendix b: at c ommands , r egisters , and r esult c odes 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 set 1200 bps (op...

  • Page 49

    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 a...

  • Page 50

    B-6 a ppendix b: at c ommands , r egisters , and r esult c odes 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 conv...

  • Page 51: Remote S Registers

    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. Table b-3 remote s registers registers descriptions s0 auto answer 0 — disabled (default) 1 — enabled s50 isdn switch signa...

  • Page 52

    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...

  • Page 53

    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 — m...

  • Page 54: Digital Modem Result Codes

    B-10 a ppendix b: at c ommands , r egisters , and r esult c odes 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...

  • Page 55: Echnical

    C t echnical s upport 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 ■ ask3com sm on ...

  • Page 56: World Wide Web Site

    C-2 a ppendix c: t echnical s upport 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 la...

  • Page 57

    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. Inter...

  • Page 58: Support From 3Com

    C-4 a ppendix c: t echnical s upport 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...

  • Page 59

    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 one year network adapters life...

  • Page 60

    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, e...

  • Page 61

    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 ...

  • Page 62

    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. Befo...