HEWLETT PACKARD COMPANY

HP 28685B

Card Type             Ethernet transceiver
Network Transfer Rate 10Mbps
Topology              Star
Wire Type             Unshielded twisted pair
Data Bus              AUI via DB-15 connector

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                                CONNECTIONS

          Function             Label           Function             Label

  UTP connector                CN1     AUI via DB-15 connector      CN2

                        USER CONFIGURABLE SETTINGS

                  Setting                       Label        Position

  »    Transceiver configured for maximum       SW1/1           Off
       UTP cable length of 100 meters

       Transceiver configured for maximum       SW1/1           On
       UTP cable length of 150 meters over
       Cat 3 cable or 225 meters over Cat 4
       cable

  »    Loopback test mode disabled              SW1/2           Off

       Loopback test mode enabled               SW1/2           On

  »    Heartbeat signal enabled                 SW1/3           On

       Heartbeat signal disabled                SW1/3           Off

  »    SQE signal enabled                       SW1/4           On

       SQE signal disabled                      SW1/4           Off

            Note:When the transceiver is configured for long cable
            lengths, it must be connected to another HP transceiver or
            hub which supports and is configured for this option.

                             DIAGNOSTIC LED(S)

    LED         Color          Status                 Condition

    PWR         Green            On                  Power is on

    PWR         Green            Off                Power is off

    LINK        Green            On          Network connection is good

    LINK        Green            Off        Network connection is broken

     TX         Green            On          Transceiver is transmitting
                                                large amounts of data

     TX         Green            Off              Transceiver is not
                                                  transmitting data

     TX         Green         Blinking       Transceiver is transmitting
                                                        data

     RX         Green            On            Transceiver is receiving
                                                large amounts of data

     RX         Green            Off         Transceiver is not receiving
                                                        data

     RX         Green         Blinking      Transceiver is receiving data

    POL         Green            On            Line polarity is normal

    POL         Green            Off          Line polarity is reversed

    COL         Yellow           On              UTP cable is faulty

    COL         Yellow           Off            Network collision not
                                                      detected

    COL         Yellow        Blinking       Network collision detected