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       # 3COM CORPORATION
       
          MICRO LINK 300
       
          Card Type                Modem (asynchronous)                  
          Chip Set                 U.S. Robotics                         
          Maximum Data Rate        300bps                                
          Data Bus                 External                              
          Data Modulation Protocol Bell 103/113                          
       
                                                                   54163
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |     Function      |   Label    |    Function    |  Label   |
          |------------------------------------------------------------|
          | Line out/in - unidentified |   CN1   | DC power      | CN4 |
          |----------------------------+---------+---------------+-----|
          | Line in/out - unidentified |   CN2   | Power switch  | SW1 |
          |----------------------------+---------+---------------+-----|
          | RS-232/422                 |   CN3   | Analog        | SW2 |
          |                            |         | loopback      |     |
          |                            |         | switch        |     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                           RS232C                           |
          |------------------------------------------------------------|
          |         Setting          | SW3/A  | SW3/B  | SW3/C | SW3/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              |
          |-----+-------+--------+-------------------------------------|
          | 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              |
          |-----+-------+--------+-------------------------------------|
          | 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     |
          +------------------------------------------------------------+
       
          +-------------------------------+
          | MISCELLANEOUS TECHNICAL NOTES |
          |-------------------------------|
          | Note: Diagram not available.  |