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       # 3COM CORPORATION
       
          EtherLink/MC TP 3C523B-TP (Assy.#6852)
       
          NIC Type         Ethernet                                      
          Transfer Rate    10Mbps                                        
          Data Bus         16-bit MCA                                    
          Topology         Linear Bus                                    
                                                                         
                           Star                                          
          Wiring Type      Unshielded twisted pair                       
                                                                         
                           DIX transceiver via DB-15 port                
          Boot ROM         Available                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                    DC CONVERTER ENABLE                     |
          |------------------------------------------------------------|
          |                Setting                 |        JP1        |
          |----------------------------------------+-------------------|
          | » |    DC signal disabled (10Base-T    | Pins 1 & 2 Closed |
          |   |             standard)              |                   |
          |---+------------------------------------+-------------------|
          |   |  DC signal enabled (non 10Base-T   | Pins 2 & 3 Closed |
          |   |              network)              |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       TRANSMIT LEVEL                       |
          |------------------------------------------------------------|
          |                Setting                 |        JP2        |
          |----------------------------------------+-------------------|
          | » |    Transmit level select normal    | Pins 1 & 2 Closed |
          |   |        (10Base-T standard)         |                   |
          |---+------------------------------------+-------------------|
          |   |   Transmit level select low (non   | Pins 2 & 3 Closed |
          |   |         10Base-T network)          |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   TWISTED PAIR IMPEDANCE                   |
          |------------------------------------------------------------|
          | Impedance |    JP3     |    JP4    |    JP5    |    JP6    |
          |-----------+------------+-----------+-----------+-----------|
          |   75ohm   | Pins 1 & 2 | Pins 1 &  | Pins 1 &  | Pins 1 &  |
          |           |   closed   | 2 closed  | 2 closed  | 2 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |  100ohm   | Pins 2 & 3 | Pins 2 &  | Pins 2 &  | Pins 2 &  |
          |           |   closed   | 3 closed  | 3 closed  | 3 closed  |
          |-----------+------------+-----------+-----------+-----------|
          |  150ohm   | Pins 3 & 4 | Pins 3 &  | Pins 3 &  | Pins 3 &  |
          |           |   closed   | 4 closed  | 4 closed  | 4 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      LINK TEST ENABLE                      |
          |------------------------------------------------------------|
          |                Setting                |        JP7         |
          |---------------------------------------+--------------------|
          | Link test enabled (10Base-T standard) | Pins 1 & 2 Closed  |
          |---------------------------------------+--------------------|
          |   Link test disabled (non 10Baset-T   | Pins 2 & 3 Closed  |
          |               network)                |                    |
          |------------------------------------------------------------|
          | Note:The link test is only valid when the cable type is    |
          | twisted pair.                                              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       RECEIVE LEVEL                        |
          |------------------------------------------------------------|
          |                Setting                 |        JP8        |
          |----------------------------------------+-------------------|
          | » |    Receive level select normal     | Pins 1 & 2 Closed |
          |   |        (10Base-T standard)         |                   |
          |---+------------------------------------+-------------------|
          |   |   Receive level select low (non    | Pins 2 & 3 Closed |
          |   |         10Base-T network)          |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  TRANSCEIVER EQUALIZATION                  |
          |------------------------------------------------------------|
          |                Setting                 |        JP9        |
          |----------------------------------------+-------------------|
          | » |  Transmitter Equalization enabled  | Pins 1 & 2 Closed |
          |   |        (10Base-T standard)         |                   |
          |---+------------------------------------+-------------------|
          |   | Receiver Equalization enabled (non | Pins 2 & 3 Closed |
          |   |         10Base-T network)          |                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    MISCELLANEOUS NOTES                     |
          |------------------------------------------------------------|
          | The interrupt request and cable type are set using the     |
          | software that comes with the card.                         |
          +------------------------------------------------------------+