CABLETRON SYSTEMS, INC.

TRFOT-2, TRFOT-3

Device Type            Fiber Optic Transceiver
NIC Type               Token Ring
Maximum Onboard Memory Unidentified
Boot ROM               Not available
Network Transfer Rate  4/16Mbps
Topology               Star
Wiring Type            Unshielded twisted pair (10Base-T)

                       Fiber optic
Data Bus               External

[Image]

                                CONNECTIONS

         Function            Label            Function           Label

  Power jack                  CN1       Fiber optic                RX
                                        connector (ST) -
                                        receive

  AUI transceiver via         CN2       Fiber optic                TX
  DB-9                                  connector (ST) -
                                        transmit

                        USER CONFIGURABLE SETTINGS

                       Function                         Label   Position

  Phantom drive disabled                                SW1/C      On

  Phantom drive enabled                                 SW1/C      Off

  Cabletron proprietary devices                         SW1/D      On

  802.5J compatible devices                             SW1/D      Off

  Note: SW1/C & SW1/D apply to RI/RO applications

                           APPLICATION SETTINGS

           Setting              SW1/A      SW1/B      SW1/C       SW1/D

  Station application            On         Off        Off         Off
  enabled

  Lobe (TCU) application         Off        Off        Off         Off
  enabled

  Ring in application            On          On      See note   See note
  enabled

  Ring out application           Off         On      See note   See note
  enabled

  Note: SW1/C & SW1/D may be in either position as illustrated in the
  user configuration table

                             DIAGNOSTIC LED(S)

   LED       Color       Status                   Condition

   PWR       Green         On                    Power is on

   PWR       Green         Off                  Power is off

    CU       Green         On        Phantom detected/valid copper link

    CU       Green      Blinking     Phantom detected/valid copper link,
                                               no data present

    CU        Red          On        Phantom not detected. No copper link

    FO       Green         On             Fiber optic link is good

    FO        Red          On            Fiber optic link is broken