3COM CORPORATION
================

   AUTO LINK 1200

   Card Type                Modem (asynchronous)                  
   Chip Set                 U.S. Robotics                         
   Maximum Data Rate        1200bps                               
   Data Bus                 External                              
   Data Modulation Protocol Bell 212A                             

                                                            54166

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |  Function   | Label  |      Function      |     Label      |
   |------------------------------------------------------------|
   | Line out        |   CN1    | Analog loopback switch | SW1  |
   |-----------------+----------+------------------------+------|
   | Line in         |   CN2    | Originate mode switch  | SW2  |
   |-----------------+----------+------------------------+------|
   | RS-232/422      |   CN3    | Power switch           | SW3  |
   |-----------------+----------+------------------------+------|
   | DC power        |   CN4    |                        |      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                 Setting                 | Label | Position |
   |-----------------------------------------+-------+----------|
   | Auto answer disabled                    | SW4/A |   Off    |
   |-----------------------------------------+-------+----------|
   | Auto answer enabled                     | SW4/A |    On    |
   |-----------------------------------------+-------+----------|
   | Local echo disabled                     | SW4/B |   Off    |
   |-----------------------------------------+-------+----------|
   | Local echo enabled                      | SW4/B |    On    |
   |-----------------------------------------+-------+----------|
   | Equalize for dial-up phone lines        | SW4/C |   Off    |
   |-----------------------------------------+-------+----------|
   | Equalize for dedicated phone lines      | SW4/C |    On    |
   |-----------------------------------------+-------+----------|
   | DTR normal                              | SW4/D |   Off    |
   |-----------------------------------------+-------+----------|
   | DTR forced high                         | SW4/D |    On    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                           RS232C                           |
   |------------------------------------------------------------|
   |         Setting          | SW5/A  | SW5/B  | SW5/C | SW5/D |
   |--------------------------+--------+--------+-------+-------|
   | Pin 2 receive/Pin 3 send |   On   |   On   |  Off  |  Off  |
   |--------------------------+--------+--------+-------+-------|
   | Pin 2 send/Pin 3 receive |  Off   |  Off   |  On   |  On   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED | Color | Status |              Condition              |
   |-----+-------+--------+-------------------------------------|
   | OH  |  Red  |   On   |          Modem is off-hook          |
   |-----+-------+--------+-------------------------------------|
   | OH  |  Red  |  Off   |          Modem is on-hook           |
   |-----+-------+--------+-------------------------------------|
   | CD  |  Red  |   On   |       Carrier signal detected       |
   |-----+-------+--------+-------------------------------------|
   | CD  |  Red  |  Off   |     Carrier signal not detected     |
   |-----+-------+--------+-------------------------------------|
   | ON  |  Red  |   On   |             Power is on             |
   |-----+-------+--------+-------------------------------------|
   | ON  |  Red  |  Off   |            Power is off             |
   |-----+-------+--------+-------------------------------------|
   | AL  |  Red  |   On   |  Modem is in analog loopback test   |
   |     |       |        |                mode                 |
   |-----+-------+--------+-------------------------------------|
   | AL  |  Red  |  Off   |   Modem is not in analog loopback   |
   |     |       |        |              test mode              |
   |-----+-------+--------+-------------------------------------|
   | TR  |  Red  |   On   |         DTR signal is high          |
   |-----+-------+--------+-------------------------------------|
   | TR  |  Red  |  Off   |          DTR signal is low          |
   |-----+-------+--------+-------------------------------------|
   | 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     |
   |-----+-------+--------+-------------------------------------|
   | AN  |  Red  |   On   |         Auto-answer enabled         |
   |-----+-------+--------+-------------------------------------|
   | AN  |  Red  |  Off   |        Auto-answer disabled         |
   |-----+-------+--------+-------------------------------------|
   | RI  |  Red  |   On   |   Modem is receiving ring signal    |
   |-----+-------+--------+-------------------------------------|
   | RI  |  Red  |  Off   | Modem is not receiving ring signal  |
   +------------------------------------------------------------+

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