ALLIED TELESYN, INC.

AT-125, AT-126

Card Type             Transceiver
NIC Type              Ethernet
Network Transfer Rate 10Mbps
Topology              Linear Bus, Star
Wiring Type           AUI transceiver via DB-15 port

                      Fiber optic cable
Data Bus              None

[Image]

                                CONNECTIONS

         Function             Label            Function            Label

  Fiber optic connector -      CN1     AUI connector                CN3
  receive

  Fiber optic connector -      CN2
  transmit

                        USER CONFIGURABLE SETTINGS

                   Function                      Label       Position

  »   SQE/Heartbeat switch disabled              SW1/1          On

      SQE/Heartbeat switch enabled               SW1/1          Off

  »   Continuous transmit function disabled      SW1/2          On

      Continuous transmit function enabled       SW1/2          Off

  »   Link test function - always on             SW1/3          On

  »   Factory configured - do not alter          SW1/4          On

                         TRANSMIT POWER SELECTION

     Setting       JP1/A    JP1/B     JP1/C     JP2/A    JP2/B     JP2/C

       Low         Closed    Open     Open      Closed    Open     Open

     Medium        Open     Closed    Open      Open     Closed    Open

      High         Open      Open     Closed    Open      Open    Closed

                             DIAGNOSTIC LED(S)

       LED             Color         Status             Condition

    Transmit       Unidentified        On       Data is being transmitted

    Transmit       Unidentified        Off          Data is not being
                                                       transmitted

     Receive       Unidentified        On        Data is being received

     Receive       Unidentified        Off          Data is not being
                                                        received

    Collision      Unidentified        On         Collision detected on
                                                         network

    Collision      Unidentified        Off       No collision detected on
                                                         network

   Link status     Unidentified        On         Link test function is
                                                        disabled

   Link status     Unidentified        Off        Link test function is
                                                         enabled

    Power/SQE         Yellow           On         SQE/Heartbeat test is
      test                                               enabled

    Power/SQE          Green           On         SQE/Heartbeat test is
      test                                              disabled