HP Fiber-Optic Hub Plus User's Guide download pdf (Page 43)

Diagnosing With the LEDs

LED patterns indicating problems

Diagnostic Tips

Power Col Fault

Port

OFF *

Check power cord and power source. If OK,

replace the hub.

Very

frequent,

or solidly

Very frequent collisions could indicate a network

fault, a cable not properly terminated, or SQE test

not disabled.

ON *

A hub hardware failure was detected during

self-test. Replace the hub.

Flashing Flashing

A port has been auto-segmented because of too

many collisions or a ThinLAN port not properly

terminated or not connected. Check cable

terminations, connections, SQE Test setting,

transceivers, and attached network devices.

OFF

OFF or

flashing

intermit-

tently

on a port

in use

Check cabling on the port indicated.

For a fiber-optic port, also check for correct Tx

and Rx connections. Try switching them.

Use the Status console command to check if:

– The port has been manually turned off.

In this case, turn the port back on.

– The port has LOW light status. In this

case, check light status on the device

at the other end of the fiber-optic link;

if it is LOW, the link is broken.

* This LED is not important for the diagnosis.

Troubleshooting 4-3

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HP Fiber-Optic Hub Plus User's Guide Page 43