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# HEWLETT PACKARD COMPANY
HP 28683A
Card Type Ethernet transceiver
Network Transfer Rate 10Mbps
Topology Star
Wire Type Fiber optic cable
Data Bus AUI via DB-15 connector
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|--------------------+-------+-----------------------+-------|
| AUI via DB-15 | CN1 | Fiber optic cable | CN3 |
| connector | | transmit connector | |
|--------------------+-------+-----------------------+-------|
| Fiber optic cable | CN2 | | |
| receive connector | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| » | SQE signal enabled | SW1/1 | Off |
|---+------------------------------------+-------+-----------|
| | SQE signal disabled | SW1/1 | On |
|---+------------------------------------+-------+-----------|
| » | Loopback test mode disabled | SW1/2 | Off |
|---+------------------------------------+-------+-----------|
| | Loopback test mode enabled | SW1/2 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-------+--------------+----------+--------------------------|
| PWR | Unidentified | On | Power is on |
|-------+--------------+----------+--------------------------|
| PWR | Unidentified | Off | Power is off |
|-------+--------------+----------+--------------------------|
| LIGHT | Unidentified | On | Network connection is |
| | | | good |
|-------+--------------+----------+--------------------------|
| LIGHT | Unidentified | Off | Network connection is |
| | | | broken |
|-------+--------------+----------+--------------------------|
| ACT | Unidentified | On | Transceiver is |
| | | | transmitting or |
| | | | receiving data |
|-------+--------------+----------+--------------------------|
| ACT | Unidentified | Off | Transceiver is not |
| | | | transmitting or |
| | | | receiving data |
|-------+--------------+----------+--------------------------|
| COL | Unidentified | On | Cable is faulty |
|-------+--------------+----------+--------------------------|
| COL | Unidentified | Off | Network collision not |
| | | | detected |
|-------+--------------+----------+--------------------------|
| COL | Unidentified | Blinking | Network collision |
| | | | detected |
+------------------------------------------------------------+