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Chapter 4
Troubleshooting
Table 4-1
Common Problems and Solutions (continued)
Symptom
No connectivity
Unreadable characters on the
management console
Amber system LED
78-15136-02
Possible Cause
Incorrect or bad cable
These are results of no link at both
ends:
A crossover cable was used
•
when a straight-through was
required, or vice-versa.
The cable is wired incorrectly.
•
A crossover or straight-through
•
cable is wired incorrectly.
STP checking for possible
•
loops.
Incorrect baud rate.
Fatal POST error detected.
Catalyst 3750 Switch Hardware Installation Guide
Diagnosing Problems
Resolution
For the correct pinouts and
•
the proper application of
crossover vs.
straight-through cables, see
the
"Two Twisted-Pair
Cable Pinouts" section on
page
B-6.
•
Replace with a tested good
cable.
•
For 1000BASE-T
connections, be sure to use
a twisted four-pair,
Category 5 cable.
Wait 30 seconds for the port
•
LED to turn green.
Reset the emulation software to
9600 baud.
Contact Cisco Systems.
4-5
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