3COM CORPORATION

IMPACT (3C872, 3C877)

Card Type                    ISDN TA, modem (asynchronous)
I/O Options                  Analog adapter (optional)
Chipset                      Unidentified
Maximum Data Rate            14.4Kbps
Maximum Fax Rate             14.4Kbps
Fax Class                    Unidentified
Data Modulation Protocol     Bell 103A, 212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32,
                             V.32bis
Fax Modulation Protocol      Unidentified
Error Correction/Compression MNP5, MNP10, V.42, V.42bis, STAC
ISDN Transfer Rate           56Kbps x 2/64Kbps x 2
ISDN Protocol                V.120, PPP
Switch Type                  5ESS, DMS100, EWSD, NI-1
Data Bus                     Serial

[Image]

                                CONNECTIONS

         Function           Label             Function             Label

  ISDN interface                 CN1       Serial port              CN4

  Analog adapter                 CN2       AC power in              CN5

  Serial port                    CN3       Power switch             SW1

            Note: CN2 may not be present on all models.

                             DIAGNOSTIC LED(S)

     LED         Color         Status                Condition

     B2          Green           On           Data call connected on B2
                                                      channel

     B2          Yellow          On          Voice call connected on B2
                                                      channel

     B2          Green        Blinking      TA is dialing data call on B2
                                                      channel

     B2          Yellow       Blinking       TA is dialing voice call on
                                                     B2 channel

     B2           N/A            Off        B2 channel is not connected

                         DIAGNOSTIC LED(S) (CON'T)

     LED         Color          Status                Condition

     B1          Green            On           Data call connected on B1
                                                       channel

     B1          Yellow           On          Voice call connected on B1
                                                       channel

     B1          Green         Blinking       TA is dialing data call on
                                                      B1 channel

     B1          Yellow        Blinking       TA is dialing voice call on
                                                      B1 channel

     B1           N/A            Off         B1 channel is not connected

      D          Yellow           On          Signal is not synchronized
                                                  or ISDN line is not
                                                      connected

      D          Yellow        Blinking       Signal is synchronized but
                                                D-channel protocols not
                                                     established

      D          Yellow          Off            Signal is synchronized

    TEST         Yellow           On             TA failed last test

    TEST         Yellow        Blinking          TA is executing test

    TEST         Yellow          Off           TA is not executing test

    POWER        Yellow           On                 Power is on

    POWER        Yellow          Off                 Power is off

                 SUPPORTED STANDARD COMMANDS

                      Basic AT Commands

  +++, A/

  A, B, E, H, L, M, O, V, X, Z

  &D, &F, &G, &V, &W

                     Extended AT Commands

  \A, \B, \G, \L, \N, \Q, \T

  %E, %L, %Q

                     Special AT Commands

  *H, -K, -Q

                         S-Registers

  S0

            Note: See MHI help file for complete information.

     UNIDENTIFIED COMMANDS

    Command         Default

      S63        Unidentified

                         Proprietary AT Command Set

                                 CALL TYPE

  Type:          Register

  Format:        AT [cmds] S61=n [cmds]

  Description:   Selects the type of call the TA will make.

    Command                              Function

     S61=0       TA will dial according to dial modifiers.

     S61=2       TA will place ISDN call.

     S61=3       TA will place modem call.

                                   DIAL

  Type:                  Immediate

  Format:                AT [cmds] D<#>;[cmds]

  Description:           Dials the telephone number indicated according
                         to any modifiers included in the string.

        Command                             Function

           D             Dial number indicated with ISDN adapter.

          DP             Dial number indicated in pulse dialing mode with
                         modem.

          DT             Dial number indicated in tone dialing mode with
                         modem.

                              PROTOCOL/SPEED

  Type:             Configuration

  Format:           AT [cmds] Fn [cmds]

  Description:      Selects the protocol and speed the modem will attempt
                    to connect at.

     Command                              Function

        F0          Auto-detect the highest common connect speed.

        F1          Select V.21 or Bell 103 at 300bps speed.

        F3          Select V.23 at 75/1200bps speed.

        F4          Select V.22 or Bell 212A at 1200bps speed.

        F5          Select V.22bis at 2400bps speed.

        F6          Select V.32 or V.32bis at 4800bps speed.

        F7          Select V.32bis at 7200bps speed.

        F8          Select V.32bis or V.32 at 9600bps speed.

        F9          Select V.32bis at 12Kbps speed.

       F10          Select V.32bis at 14.4Kbps speed.

      See 3COM CORPORATION IMPACT (3C871) for a full command summary.