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Chapter 3
Troubleshooting
10Base-T Cabling
If the Power LED is not lit
❑
Check your power connections.
If the LINK LED is not lit
1.
Check that the device at the opposite end of the UTP link is powered
on, and make sure the cable is properly connected.
2. Check that the proper cable pinout is used. If another manufacturer’s
10Base-T device is used at the opposite end of the UTP link, make sure
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.
Note
UTP cable wiring is the most common cause of non-functional segments during
installation. Use only UTP cable Category 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. Do not enable the SQE/Heartbeat Test on the repeaters.
Excessive flickering of the Collision LED may indicate excessive 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.
