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       |                   |
   |--------------+-----+-------------------+-------------------|
   |    i COM4    |  3  | Pins 1 & 3, 2 & 4 | Pins 2 & 4 closed |
   |    (2E8h)    |     |      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              |
   |--------------+---------------------------------------------|
   |    i -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                   |
   |--------------+---------------------------------------------|
   |    i -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                   |
   |--------------+---------------------------------------------|
   |    i *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                   |
   |--------------+---------------------------------------------|
   |    i )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                   |
   |--------------+---------------------------------------------|
   |    i @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                          |
   |--------------+---------------------------------------------|
   |    i :E1     | Equalizer enabled                           |