3COM CORPORATION

AUTO LINK 212A

Card Type                Modem (asynchronous)
Chip Set                 U.S. Robotics
Maximum Data Rate        1200bps
Data Bus                 External
Data Modulation Protocol Bell 212A

                                                                      54165

                                CONNECTIONS

         Function           Label             Function             Label

  Line out                      CN1       Analog loopback switch    SW1

  Line in                       CN2       Originate mode switch     SW2

  RS-232/422                    CN3       Power switch              SW3

  DC power                      CN4       High speed                SW4

                        USER CONFIGURABLE SETTINGS

                      Setting                         Label      Position

  Auto answer disabled                                SW5/A        Off

  Auto answer enabled                                 SW5/A        On

  Local echo disabled                                 SW5/B        Off

  Local echo enabled                                  SW5/B        On

  Equalize for dial-up phone lines                    SW5/C        Off

  Equalize for dedicated phone lines                  SW5/C        On

  DTR normal                                          SW5/D        Off

  DTR forced high                                     SW5/D        On

                                  RS232C

        Setting           SW6/A        SW6/B        SW6/C        SW6/D

  Pin 2 receive/Pin 3       On          On           Off          Off
         send

    Pin 2 send/Pin 3       Off          Off          On           On
        receive

                             DIAGNOSTIC LED(S)

   LED      Color    Status                    Condition

    OH       Red       On                  Modem is off-hook

    OH       Red      Off                  Modem is on-hook

    CD       Red       On               Carrier signal detected

    CD       Red      Off             Carrier signal not detected

    ON       Red       On                     Power is on

    ON       Red      Off                    Power is off

    AL       Red       On        Modem is in analog loopback test mode

    AL       Red      Off      Modem is not in analog loopback test mode

    TR       Red       On                 DTR signal is high

    TR       Red      Off                  DTR signal is low

    SD       Red       On             Modem is transmitting data

    SD       Red      Off           Modem is not transmitting data

    RD       Red       On               Modem is receiving data

    RD       Red      Off             Modem is not receiving data

    AN       Red       On                 Auto-answer enabled

    AN       Red      Off                Auto-answer disabled

    HS       Red       On            Modem is operating at 1200bps

    HS       Red      Off      Modem is operating at slower than 1200bps

     MISCELLANEOUS TECHNICAL NOTES
           Note: Diagram not available.