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# HEWLETT PACKARD COMPANY
HP 28685B
Card Type Ethernet transceiver
Network Transfer Rate 10Mbps
Topology Star
Wire Type Unshielded twisted pair
Data Bus AUI via DB-15 connector
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------+-------+-------------------------+-------|
| UTP connector | CN1 | AUI via DB-15 connector | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| » | Transceiver configured for maximum | SW1/1 | Off |
| | UTP cable length of 100 meters | | |
|---+------------------------------------+-------+-----------|
| | Transceiver configured for maximum | SW1/1 | On |
| | UTP cable length of 150 meters | | |
| | over Cat 3 cable or 225 meters | | |
| | over Cat 4 cable | | |
|---+------------------------------------+-------+-----------|
| » | Loopback test mode disabled | SW1/2 | Off |
|---+------------------------------------+-------+-----------|
| | Loopback test mode enabled | SW1/2 | On |
|---+------------------------------------+-------+-----------|
| » | Heartbeat signal enabled | SW1/3 | On |
|---+------------------------------------+-------+-----------|
| | Heartbeat signal disabled | SW1/3 | Off |
|---+------------------------------------+-------+-----------|
| » | SQE signal enabled | SW1/4 | On |
|---+------------------------------------+-------+-----------|
| | SQE signal disabled | SW1/4 | Off |
|------------------------------------------------------------|
| Note:When the transceiver is configured for long |
| cable lengths, it must be connected to another HP |
| transceiver or hub which supports and is configured |
| for this option. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|------+--------+----------+---------------------------------|
| PWR | Green | On | Power is on |
|------+--------+----------+---------------------------------|
| PWR | Green | Off | Power is off |
|------+--------+----------+---------------------------------|
| LINK | Green | On | Network connection is good |
|------+--------+----------+---------------------------------|
| LINK | Green | Off | Network connection is broken |
|------+--------+----------+---------------------------------|
| TX | Green | On | Transceiver is transmitting |
| | | | large amounts of data |
|------+--------+----------+---------------------------------|
| TX | Green | Off | Transceiver is not transmitting |
| | | | data |
|------+--------+----------+---------------------------------|
| TX | Green | Blinking | Transceiver is transmitting |
| | | | data |
|------+--------+----------+---------------------------------|
| RX | Green | On | Transceiver is receiving large |
| | | | amounts of data |
|------+--------+----------+---------------------------------|
| RX | Green | Off | Transceiver is not receiving |
| | | | data |
|------+--------+----------+---------------------------------|
| RX | Green | Blinking | Transceiver is receiving data |
|------+--------+----------+---------------------------------|
| POL | Green | On | Line polarity is normal |
|------+--------+----------+---------------------------------|
| POL | Green | Off | Line polarity is reversed |
|------+--------+----------+---------------------------------|
| COL | Yellow | On | UTP cable is faulty |
|------+--------+----------+---------------------------------|
| COL | Yellow | Off | Network collision not detected |
|------+--------+----------+---------------------------------|
| COL | Yellow | Blinking | Network collision detected |
+------------------------------------------------------------+