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       # 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                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |       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      |    J2    | Pins 1 & 2  |
          |   | normal                        |          |   closed    |
          |---+-------------------------------+----------+-------------|
          |   | Receive threshold select low  |    J2    | Pins 2 & 3  |
          |   | 1                             |          |   closed    |
          |---+-------------------------------+----------+-------------|
          | » | Transmit level select normal  |    J3    | Pins 1 & 2  |
          |   | (± 5V)                        |          |   closed    |
          |---+-------------------------------+----------+-------------|
          |   | Transmit level select low (±  |    J3    | Pins 2 & 3  |
          |   | 2V)                           |          |   closed    |
          |---+-------------------------------+----------+-------------|
          | » | DC signal disabled 2          |    J4    | Pins 1 & 2  |
          |   |                               |          |   closed    |
          |---+-------------------------------+----------+-------------|
          |   | DC signal enabled (on receive |    J4    | Pins 2 & 3  |
          |   | wires) 3                      |          |   closed    |
          |---+-------------------------------+----------+-------------|
          | » | Cable impedance select        |    J6    | Pins 2 & 3  |
          |   | 100ohms                       |          |   closed    |
          |---+-------------------------------+----------+-------------|
          |   | Cable impedance select        |    J6    | Pins 3 & 4  |
          |   | 150ohms                       |          |   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  |   HP StarLAN10, DAVID   |
          |          |      (see 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               |
          +------------------------------------------------------------+