ZOOM TELEPHONICS, INC.

VFP 28.8

Card Type                    Fax, Modem (asynchronous)
Chip Set                     Unidentified
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     8-bit ISA
Fax Class                    Unidentified
Data Modulation Protocol     Unidentified
Fax Modulation Protocol      Unidentified
Error Correction/Compression Unidentified

                                                                      V2021

                                CONNECTIONS

         Function            Label            Function             Label

  Line out                        CN1       Line in                 CN2

                  SERIAL PORT ADDRESS/INTERRUPT SELECTION

     Setting          IRQ              JP1                   JP2

   COM1 (3F8h)         4        Pins 3 & 5, 4 & 6     Pins 1 & 3 closed
                                     closed

   COM2 (2F8h)         3        Pins 2 & 4, 3 & 5     Pins 2 & 4 closed
                                     closed

   COM3 (3E8h)         4        Pins 4 & 6, 1 & 3     Pins 1 & 3 closed
                                     closed

   COM4 (2E8h)         3        Pins 1 & 3, 2 & 4     Pins 2 & 4 closed
                                     closed

     MISCELLANEOUS TECHNICAL NOTES
           Note: Diagram not available.

                         Proprietary AT Command Set

                          MNP - EXTENDED SERVICES

  Type:                  Configuration

  Format:                AT [cmds] -Kn [cmds]

  Description:           Controls V.42 LAPM to MNP10 conversion

        Command                              Function

          -K0            MNP extended services disabled

          -K1            MNP extended services enabled

          -K2            MNP extended services enabled; suppress MNP
                         extended services initiation on V.42 LAPM answer
                         detection phase.

                             MNP10 - FALLBACK

  Type:          Configuration

  Format:        AT [cmds] -Qn [cmds]

  Description:   Allows MNP10 to fall back to 2400bps

    Command                              Function

      -Q0        MNP10 at 2400bps disabled

      -Q1        MNP10 at 2400bps enabled

                         MNP10 - LINK NEGOTIATION

  Type:          Configuration

  Format:        AT [cmds] *Hn [cmds]

  Description:   Sets the speed at which MNP10 link negotiation will
                 occur

    Command                              Function

      *H0        Link will be negotiated at highest possible speed

      *H1        Link will be negotiated at 1200bps

      *H2        Link will be negotiated at 4800bps

                        MNP10 - POWER LEVEL ADJUST

  Type:                Configuration

  Format:              AT [cmds] )Mn [cmds]

  Description:         Controls automatic transmit power level adjustment
                       during MNP 10 link negotiation

       Command                              Function

         )M0           Power level adjustment disabled

         )M1           Power level adjustment enabled

                       TRANSMISSION LEVEL - CELLULAR

  Type:           Configuration

  Format:         AT [cmds] @Mn [cmds]

  Default:        26

  Range:          0,1,2-10,11-31

  Unit:           -1dBm

  Description:    Sets the signal level for transmission while in
                  cellular mode

    Command                              Function

      @M0         -26 dBm

      @M1         -30 dBm

    @M2-@M10      -10 dBm

                        V.32 - COMPROMISE EQUALIZER

  Type:          Configuration

  Format:        AT [cmds] :En [cmds]

  Description:   Controls V.32 compromise equalizer

    Command                              Function

      :E0        Equalizer disabled

      :E1        Equalizer enabled