3COM CORPORATION

EtherLink II TP (3C503B-TP; Assy.#06-0098)

NIC Type      Ethernet
Transfer Rate 10Mbps
Data Bus      8-bit ISA
Topology      Linear bus

              Star
Wiring Type   Unshielded twisted pair

              AUI transceiver via DB-15 port
Boot ROM      Available

[Image]

                              10BASE-T STANDARD COMPATIBILITY CONFIGURATION

                     Setting                                Jumper                     Setting

  »   Link beat enabled                                       J1                  Pins 1 & 2 closed

      Link beat disabled                                      J1                  Pins 2 & 3 closed

  »   Receive threshold select normal                         J2                  Pins 1 & 2 closed

      Receive threshold select low 1                          J2                  Pins 2 & 3 closed

  »   Transmit level select normal (± 5V)                     J3                  Pins 1 & 2 closed

      Transmit level select low (± 2V)                        J3                  Pins 2 & 3 closed

  »   DC signal disabled 2                                    J4                  Pins 1 & 2 closed

      DC signal enabled (on receive wires) 3                  J4                  Pins 2 & 3 closed

  »   Cable impedance select 100ohms                          J6                  Pins 2 & 3 closed

      Cable impedance select 150ohms                          J6                  Pins 3 & 4 closed

      Cable impedance select 75ohms                           J6                  Pins 1 & 2 closed

      Note 1 : Use this setting with the 3Com MultiConnect TP Module. Do not use this setting with the
      3Com

      LinkBuilder, or the SynOptics LattisNet Model 3308.

      Note 2 :This is the 10BASE-T standard and should be used with all 10BASE-T standard hubs.

      Note 3 :This setting is required when using any Pre-10BASE-T SynOptics hub.

             PRE-10BASE-T STANDARD COMPATIBILITY CONFIGURATION

    Jumper       SynOptics LattisNet (see        HP StarLAN10, DAVID
                          note)                      ExpressNet,

                                                AT&T StarLan10 (Model
                                                      6601-01)

      J1            Pins 2 & 3 closed             Pins 2 & 3 closed

      J2            Pins 2 & 3 closed             Pins 1 & 2 closed

      J3            Pins 2 & 3 closed             Pins 1 & 2 closed

      J4            Pins 1 & 2 closed             Pins 2 & 3 closed

      J6            Pins 2 & 3 closed             Pins 2 & 3 closed

  Note:This table applies to SynOptic's System 3000 (module 3305), the
  2500 family (models 2500,

                             BOOT ROM ADDRESS

     Address         JP7A       JP7B        JP7C       JP7D        JP7E

  »    Disabled     Closed      Open        Open       Open        Open

        C8000h       Open      Closed       Open       Open        Open

        CC000h       Open       Open       Closed      Open        Open

        D8000h       Open       Open        Open      Closed       Open

        DC000h       Open       Open        Open       Open       Closed

                                 I/O BASE ADDRESS

  Address    JP8A     JP8B     JP8C     JP8D    JP8E     JP8F     JP8G     JP8H

  »   300h  Closed    Open     Open     Open    Open     Open     Open     Open

      250h   Open     Open     Open     Open    Closed   Open     Open     Open

      280h   Open     Open     Open     Open    Open     Closed   Open     Open

      2A0h   Open     Open     Open     Open    Open     Open     Closed   Open

      2E0h   Open     Open     Open     Open    Open     Open     Open     Closed

      310h   Open    Closed    Open     Open    Open     Open     Open     Open

      330h   Open     Open    Closed    Open    Open     Open     Open     Open

      350h   Open     Open     Open    Closed   Open     Open     Open     Open

                             DIAGNOSTIC LED(S)

   LED        Color        Status                   Condition

    L1       Yellow       Blinking                Data is being
                                              transmitted/received

    L1       Yellow          Off                Data is not being
                                              transmitted/received

    L2        Green          On          Twisted pair network connection
                                                     is good

    L2        Green       Blinking          Twisted pair wire polarity
                                                    reversed

    L2        Green          Off         Twisted pair network connection
                                                    is broken

  Notes:L2 is functional only when the cable type is twisted pair.

  Reversed polarity is automatically corrected for but this may impede
  performance. It is suggested that