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Chapter 6
Troubleshooting
10BASE-T Cabling
If the Power LED is not lit
❑
Check your power connections.
If the Port OK LED is not lit
1.
Check that the device at the opposite end of the UTP link is powered on,
and that the cable is properly connected.
2.
Check that the proper cable pin-out is used. If another manufacturer’s
10BASE-T device is used on the opposite end of the UTP link, check that
it is true 10BASE-T.
If only one segment is non-functional, try another port to determine if the
port or cable segment is at fault.
UTP cable wiring is the most common cause of non-functional segments at
installation time. Use only UTP cable Level 3 or above designed for use in
10BASE-T applications. 10BASE-T wiring lengths should not exceed 100
meters (328 ft.). The wiring should be routed away from devices known to emit
electromagnetic interference, such as fluorescent lights, power transformers,
and relay equipment.
Collision LED
If the Collision LED is flashing excessively, make certain that the SQE/
Heartbeat Test function is disabled on the transceiver attached to the AUI
port. Repeaters do not want the SQE/Heartbeat Test enabled.
Excessive flickering of the Collision LED may indicate too many frame
collisions on the segment. This may be caused by an overloaded segment or
faulty cable or connection.
If no ports are functional, and the Power LED is illuminated, try a known
good repeater to test and validate the segment.
Note
