ZOOM TELEPHONICS, INC.
======================

   VFX 28.8

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

                                                            V2022

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function        | Label  |   Function    |   Label   |
   |------------------------------------------------------------|
   | Line out                  |   CN1    | DC power     | CN4  |
   |---------------------------+----------+--------------+------|
   | Line in                   |   CN2    | Power switch | SW1  |
   |---------------------------+----------+--------------+------|
   | RS-232/422                |   CN3    |              |      |
   +------------------------------------------------------------+

   +-----------------------------------+
   |   MISCELLANEOUS TECHNICAL NOTES   |
   |-----------------------------------|
   |      Note: Diagram not available. |
   +-----------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED  | Color |  Status  |            Condition             |
   |------+-------+----------+----------------------------------|
   | MSG  |  Red  |    On    |  Used by software applications.  |
   |      |       |          |        Faxes are waiting         |
   |------+-------+----------+----------------------------------|
   | MSG  |  Red  |   Off    |  Used by software applications.  |
   |      |       |          |      Faxes are not waiting       |
   |------+-------+----------+----------------------------------|
   | FAX  |  Red  |    On    |  Modem is connected in FAX mode  |
   |------+-------+----------+----------------------------------|
   | FAX  |  Red  |   Off    |  Modem is not connected in FAX   |
   |      |       |          |               mode               |
   |------+-------+----------+----------------------------------|
   | 28.8 |  Red  |    On    |   Modem connected at 28.8Kbps    |
   |------+-------+----------+----------------------------------|
   | 28.8 |  Red  |   Off    | Modem not connected at 28.8Kbps  |
   |------+-------+----------+----------------------------------|
   | VFC  |  Red  |    On    |    Modem connected using V.FC    |
   |------+-------+----------+----------------------------------|
   | VFC  |  Red  |   Off    |  Modem not connected using V.FC  |
   |------+-------+----------+----------------------------------|
   | 14.4 |  Red  |    On    |   Modem connected at 14.4Kbps    |
   |      |       |          |   (V.FC, V.32bis, or FAX mode)   |
   |------+-------+----------+----------------------------------|
   | 14.4 |  Red  |   Off    | Modem not connected at 14.4Kbps  |
   |      |       |          |   (V.FC, V.32bis, or FAX mode)   |
   |------+-------+----------+----------------------------------|
   |  DC  |  Red  |    On    |   Data compression (V.42bis or   |
   |      |       |          |          MNP5) enabled           |
   |------+-------+----------+----------------------------------|
   |  DC  |  Red  |   Off    |   Data compression (V.42bis or   |
   |      |       |          |          MNP5) disabled          |
   |------+-------+----------+----------------------------------|
   |  EC  |  Red  |    On    | Error correction (V.42 or MNP4)  |
   |      |       |          |             enabled              |
   |------+-------+----------+----------------------------------|
   |  EC  |  Red  |   Off    | Error correction (V.42 or MNP4)  |
   |      |       |          |             disabled             |
   |------+-------+----------+----------------------------------|
   |  FC  |  Red  |    On    |  Flow control enabled and data   |
   |      |       |          |         buffers not full         |
   |------+-------+----------+----------------------------------|
   |  FC  |  Red  |   Off    |  Flow control disabled or data   |
   |      |       |          |           buffers full           |
   |------+-------+----------+----------------------------------|
   |  AA  |  Red  |    On    |       Auto-answer enabled        |
   |------+-------+----------+----------------------------------|
   |  AA  |  Red  |   Off    |       Auto-answer disabled       |
   |------+-------+----------+----------------------------------|
   |  AA  |  Red  | Blinking |         Phone is ringing         |
   |------+-------+----------+----------------------------------|
   |  CD  |  Red  |    On    |     Carrier signal detected      |
   |------+-------+----------+----------------------------------|
   |  CD  |  Red  |   Off    |   Carrier signal not detected    |
   |------+-------+----------+----------------------------------|
   |  OH  |  Red  |    On    |        Modem is off-hook         |
   |------+-------+----------+----------------------------------|
   |  OH  |  Red  |   Off    |         Modem is on-hook         |
   |------+-------+----------+----------------------------------|
   |  RD  |  Red  |    On    |     Modem is receiving data      |
   |------+-------+----------+----------------------------------|
   |  RD  |  Red  |   Off    |   Modem is not receiving data    |
   |------+-------+----------+----------------------------------|
   |  SD  |  Red  |    On    |    Modem is transmitting data    |
   |------+-------+----------+----------------------------------|
   |  SD  |  Red  |   Off    |  Modem is not transmitting data  |
   |------+-------+----------+----------------------------------|
   |  TR  |  Red  |    On    |        DTR signal is high        |
   |------+-------+----------+----------------------------------|
   |  TR  |  Red  |   Off    |        DTR signal is low         |
   |------+-------+----------+----------------------------------|
   |  MR  |  Red  |    On    |           Power is on            |
   |------+-------+----------+----------------------------------|
   |  MR  |  Red  |   Off    |           Power is off           |
   +------------------------------------------------------------+

                     Proprietary AT Command Set