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518 CHAPTER 37: TROUBLESHOOTING
No connection and the
port LED is off
Incorrect ethernet cable,
e.g., crossed rather than
straight cable, or vice
versa, split pair (incorrect
twisting of pairs).
Check pinout and
replace if necessary.
Fiber optical cable
connection is reversed.
Change if necessary.
Check Rx and Tx on the
fiber-optic cable.
Bad cable. Replace with a tested
cable.
Wrong cable type. Verify that all 10 Mbps
connections use a Cat 5
cable.
Check the port LED or
zoom screen in the NMS
application, and change
settings if necessary.
Problem Possible Cause Solution