
3COM CORPORATION

ETHERLINK/MC TP (3C523-TP)

NIC Type              Ethernet
Network Transfer Rate 10Mbps
Data Bus              MCA
Topology              Linear Bus/Star
Wire Type             Unshielded twisted pair

                      AUI transceiver via DB-15 port
Boot ROM              Available

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  Unshielded twisted pair     CN1     AUI transceiver via DB-15     CN2
                                      port

                        USER CONFIGURABLE SETTINGS

                   Setting                      Label        Position

     Transmit equalization                       J5         Pins 1 & 2
                                                              closed

      Receive equalization                        J5         Pins 2 & 3
                                                              closed

     Receive threshhold normal                   J6         Pins 1 & 2
                                                              closed

      Receive threshhold low                      J6         Pins 2 & 3
                                                              closed

     SQE heartbeat enabled                       J7         Pins 1 & 2
                                                              closed

      SQE heartbeat disabled                      J7         Pins 2 & 3
                                                              closed

     Transmit level normal                       J8         Pins 1 & 2
                                                              closed

      Transmit level attenuated                   J8         Pins 2 & 3
                                                              closed

     DC signal disabled                          J9         Pins 2 & 3
                                                              closed

      DC signal enabled                           J9         Pins 1 & 2
                                                              closed

                              LINE IMPEDANCE

     Setting           J1            J2            J3             J4

       75 ohms     Pins 1 & 2    Pins 1 & 2     Pins 1 & 2    Pins 1 & 2
                     closed        closed        closed         closed

     100 ohms     Pins 2 & 3    Pins 2 & 3     Pins 2 & 3    Pins 2 & 3
                     closed        closed        closed         closed

      150 ohms     Pins 3 & 4    Pins 3 & 4     Pins 3 & 4    Pins 3 & 4
                     closed        closed        closed         closed

