
ZOOM TELEPHONICS, INC.

COMSTAR 28800

Card Type                    Fax, Modem (asynchronous), Voice
Chip Set                     Unidentified
I/O Options                  Speakerphone, Voice mail
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     8-bit ISA
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103/212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32,
                             V.32bis, V.34
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29, V.33
Error Correction/Compression MNP10, V.42bis

[Image]

                                CONNECTIONS

        Function           Label             Function              Label

  Line out                      CN1      Microphone                 CN3

  Line in                       CN2      Speaker                    CN4

                        USER CONFIGURABLE SETTINGS

                  Function                      Label        Position

  Electret microphone                            JP1        Pins 1 & 2
                                                              closed

  Plantronics headset                            JP1        Pins 2 & 3
                                                              closed

  Dynamic microphone                             JP1           Open

  Unpowered speaker, volume medium level         JP2          Closed

  Powered speaker, volume low level              JP2           Open

  Volume high level                              JP2          Closed

  Unpowered speaker, volume medium level         JP3          Closed

  Powered speaker, volume low level              JP3           Open

  Volume high level                              JP3           Open

                         Proprietary AT Command Set

                 AUTO-RETRAIN - AUTO-FALLBACK/FALL-FORWARD

  Type:          Configuration

  Format:        AT [cmds] %En [cmds]

  Description:   Controls auto-retrain mode and
                 auto-fallback/fall-forward

    Command                              Function

      %E0        Auto-retrain disabled

      %E1        Auto-retrain enabled

      %E2        Auto-fallback/fall-forward enabled

      %E3        Auto-retrain enabled with fast hang-up

      BIT MAPPED REGISTERS

    Register        Default

      S14        Unidentified

      S16        Unidentified

      S21        Unidentified

      S22        Unidentified

      S23        Unidentified

      S27        Unidentified

      S28        Unidentified

      S31        Unidentified

      S40        Unidentified

      S41        Unidentified

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Default:       3

  Range:         1-9

  Unit:          .1 second

  Description:   Sends break to modem

                                BREAK TYPE

  Type:          Configuration

  Format:        AT [cmds] \Kn [cmds]

  Description:   Configures action of break signal

                                 CALLER ID

  Type:          Configuration

  Format:        AT [cmds] #CID=n [cmds]

  Description:   Controls the Caller ID function

    Command                              Function

     #CID=0      Caller ID disabled

     #CID=1      Caller ID enabled

                                COMPRESSION

  Type:          Configuration

  Format:        AT [cmds] %Cn [cmds]

  Description:   Selects data compression

    Command                              Function

      %C0        Data compression disabled

      %C1        MNP5 enabled

      %C2        V.42bis enabled

      %C3        MNP5 and V.42bis enabled

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Description:   Controls the type of connection the modem will operate
                 in

    Command                              Function

      \N0        Normal mode enabled

      \N1        Direct mode enabled

      \N2        Reliable mode enabled

      \N3        Auto-reliable mode enabled

      \N4        LAP-M error correcting only enabled

      \N5        MNP error correcting only enabled

                                   DIAL

  Type:                   Immediate

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

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

        Modifier                             Function

           L              Redials last number

           P              Pulse dialing enabled

           T              Tone dialing enabled

           W              Dialing resumed following dial tone detection

           ,              Dialing paused for amount of time specified in
                          S8 register

           @              Modem waits for a ring-back signal followed by
                          silence up to 5 second prior to executing the
                          rest of the dial string.

           R              Command recognized and not initiated

           ;              Modem returned to command mode after dialing.

           !              Flash function initiated. Goes on-hook for
                          amount of time specified in S29 register

        S=(0-3)           Number in memory location &Zn dialed

           ^              Calling tone enabled, data mode only.

                         FLASH DIAL MODIFIER TIME

  Type:                Register

  Format               AT [cmds] S29=n [cmds]

  Default:             70

  Range:               0-255

  Unit:                .01 second

  Description:         Time the modem will go on-hook upon receiving the
                       ! dial modifier in dial string.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Description:   Selects modem port flow control

    Command                              Function

      \G0        Flow control disabled

      \G1        Flow control enabled

                               FLOW CONTROL

  Type:          Register

  Format:        AT [cmds] S39=n [cmds]

  Description:   Select the type of flow control used

    Command                              Function

     S39=0        Flow control disabled

     S39=3        Hardware flow control enabled

     S39=4        Software flow control enabled

     S39=5        Transparent software flow control enabled

     S39=6        Both hardware and software flow control enabled

                       FLOW CONTROL CHARACTER - XOFF

  Type:          Register

  Format:        AT [cmds] S33=n [cmds]

  Default:       19

  Range:         0-255

  Unit:          ASCII

  Description:   Sets the character used to represent XOFF

                       FLOW CONTROL CHARACTER - XON

  Type:          Register

  Format:        AT [cmds] S32=n [cmds]

  Default:       17

  Range:         0-255

  Unit:          ASCII

  Description:   Sets the character used to represent XON

                             LINE SIGNAL LEVEL

  Type:             Immediate

  Format:           AT [cmds] %L [cmds]

  Description:      Returns a value which indicates the received line
                    signal level (-dBm)

                            LINE SIGNAL QUALITY

  Type:          Immediate

  Format:        AT [cmds] %Q [cmds]

  Description:   Returns a value which indicates line signal quality

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Description:   Sets the maximum transmittable block size

    Command                              Function

      \A0        MNP block size is 64 characters

      \A1        MNP block size is 128 characters

      \A2        MNP block size is 192 characters

      \A3        MNP block size is 256 characters

                          MNP - STREAM/BLOCK MODE

  Type:          Configuration

  Format:        AT [cmds] \Ln [cmds]

  Description:   Selects the transfer mode for MNP link

    Command                              Function

      \L0        Stream mode for MNP enabled

      \L1        Block mode for MNP enabled

                         MNP10 - EXTENDED SERVICES

  Type:          Configuration

  Format:        AT [cmds] -Kn [cmds]

  Description:   Selects MNP10 extended services

    Command                              Function

      -K0        MNP10 disabled

      -K1        MNP10 enabled

      -K2        MNP10 enabled on originate mode only

                             MNP10 - FALLBACK

  Type:          Configuration

  Format:        AT [cmds] -Qn [cmds]

  Description:   Allows MNP10 to fall back to 2400bps

    Command                              Function

      -Q0        MNP10 at 2400 disabled

      -Q1        MNP10 at 2400 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

                       MODULATION SELECTION DISPLAY

  Type:             Immediate

  Format:           AT [cmds] +MS? [cmds]

  Description:      Displays modulation, automode, minimum rate and
                    maximum rate settings

                           MODULATION SELECTION

  Type:                  Configuration

  Format:                AT [cmds] +MS=x,y,z,a [cmds]

  Description:           Sets options for active protocol; the transfer
                         rates specified by z and a must be valid for the
                         protocol selected.

        Command                              Function

          x=0            V.21

          x=1            V.22

          x=2            V.22bis

          x=3            V.23

          x=9            V.32

         x=10            V.32bis

         x=11            V.34

         x=64            Bell 103

         x=69            Bell 212A

         x=74            V.FC

          y=0            Automode disabled

          y=1            Auto-detect highest speed enabled

       z, a=300          Set minimum or maximum transfer rate at 300bps,
                         respectively.

       z, a=1200         Set minimum or maximum transfer rate at 1200bps,
                         respectively.

       z, a=2400         Set minimum or maximum transfer rate at 2400bps,
                         respectively.

       z, a=4800         Set minimum or maximum transfer rate at 4800bps,
                         respectively.

       z, a=7200         Set minimum or maximum transfer rate at 7200bps,
                         respectively.

       z, a=9600         Set minimum or maximum transfer rate at 9600bps,
                         respectively.

      z, a=12000         Set minimum or maximum transfer rate at
                         12000bps, respectively.

      z, a=14400         Set minimum or maximum transfer rate at
                         14400bps, respectively.

      z, a=16800         Set minimum or maximum transfer rate at
                         16800bps, respectively.

      z, a=19200         Set minimum or maximum transfer rate at
                         19200bps, respectively.

      z, a=21600         Set minimum or maximum transfer rate at
                         21600bps, respectively.

      z, a=24000         Set minimum or maximum transfer rate at
                         24000bps, respectively.

      z, a=26400         Set minimum or maximum transfer rate at
                         26400bps, respectively.

      z, a=28800         Set minimum or maximum transfer rate at
                         28800bps, respectively.

                                SLEEP TIMER

  Type:                   Register

  Format                  AT [cmds] S24=n [cmds]

  Default:                0

  Range:                  0-255

  Unit:                   1 second

  Description:            Maximum duration of DTE and DCE inactivity
                          allowed prior to initiating low-power sleep
                          mode.

                           SPEAKERPHONE OPTIONS

  Type:          Immediate/Configuration

  Format:        AT [cmds] (see below) [cmds]

  Description:   Configures the modem to voice mode

    Command                              Function

     #CLS=8       Enable voice mode

     #VLS=6       Enable speakerphone

       A          Answer in-coming call

     #VRN=0       To originate a call, then AT<#><enter>

       HZ         Ends the call

                           SPEAKERPHONE SETTINGS

  Type:                Configuration

  Format:              AT [cmds] #SPK=x, y, z [cmds]

  Description:         Controls the speakerphone settings

       Command                              Function

         x=0           Microphone muted, speaker enabled

         x=1           Microphone and speaker enabled

         x=2           Microphone on maximum and speaker disabled

       y=(0-16)        Speaker volume; increase the value lowers the
                       volume.

         Y=5           Default setting

       Z=(0-3)         Microphone sensitivity; increase the value the
                       microphone becomes more sensitive.

         Z=1           Default setting

                       TRANSMISSION LEVEL - CELLULAR

  Type:           Configuration

  Format:         AT [cmds] @Mn [cmds]

  Default:        0

  Range:          11-30

  Unit:           -1 dBm

  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

