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# 3COM CORPORATION
ETHERLINK/MC TP (3C523-TP)
NIC Type Ethernet
Network Transfer Rate 10Mbps
Data Bus MCA
Topology Linear Bus/Star
Wire Type Unshielded twisted pair
AUI transceiver via DB-15 port
Boot ROM Available
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|--------------------+-------+-----------------------+-------|
| Unshielded twisted | CN1 | AUI transceiver via | CN2 |
| pair | | DB-15 port | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|--------------------------------+-------+-------------------|
| » | Transmit equalization | J5 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | Receive equalization | J5 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| » | Receive threshhold normal | J6 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | Receive threshhold low | J6 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| » | SQE heartbeat enabled | J7 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | SQE heartbeat disabled | J7 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| » | Transmit level normal | J8 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | Transmit level attenuated | J8 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| » | DC signal disabled | J9 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | DC signal enabled | J9 | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE IMPEDANCE |
|------------------------------------------------------------|
| Setting | J1 | J2 | J3 | J4 |
|-------------+-----------+-----------+-----------+----------|
| | 75 ohms | Pins 1 & | Pins 1 & | Pins 1 & | Pins 1 & |
| | | 2 closed | 2 closed | 2 closed | 2 closed |
|---+---------+-----------+-----------+-----------+----------|
| » | 100 | Pins 2 & | Pins 2 & | Pins 2 & | Pins 2 & |
| | ohms | 3 closed | 3 closed | 3 closed | 3 closed |
|---+---------+-----------+-----------+-----------+----------|
| | 150 | Pins 3 & | Pins 3 & | Pins 3 & | Pins 3 & |
| | ohms | 4 closed | 4 closed | 4 closed | 4 closed |
+------------------------------------------------------------+