IBM CORPORATION

14.4KBPS DATA/FAX MODEM EXTERNAL 7851 MODEL 1

Card Type                    Fax, Modem (synchronous, asynchronous)
Chip Set                     Unidentified
Maximum Data Rate            14.4Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103/212A

                             ITU-T V.21, V.22, V.22bis, V.32, V.32bis
Fax Modulation Protocol      ITU-T V.17, V.21, V.27ter, V.29
Error Correction/Compression MNP5, V.42, V.42bis

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                                CONNECTIONS

         Function            Label            Function             Label

  DC power                       CN1       Line in                  CN4

  RS-232/422                     CN2       Power switch             SW1

  Line out                       CN3

                             DIAGNOSTIC LED(S)

   LED       Color      Status                   Condition

    TM        Red         On               Modem is in test mode

    TM        Red         Off            Modem is not in test mode

    TM        Red       Blinking              Errors detected

    AA        Red         On                Auto-answer enabled

    AA        Red         Off               Auto-answer disabled

    HS        Red         On          Modem is operating at 4800bps or
                                                   faster

    HS        Red         Off         Modem is operating at slower than
                                                  4800bps

    OH        Red         On                 Modem is off-hook

    OH        Red         Off                 Modem is on-hook

    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

    TR        Red         On                 DTR signal is high

    TR        Red         Off                DTR signal is low

    CD        Red         On              Carrier signal detected

    CD        Red         Off           Carrier signal not detected

                         Proprietary AT Command Set

               See document V2011 for a full command summary.