Cisco WS-C3750X-24T-L Hardware Installation Guide - Page 115

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Chapter 4 Troubleshooting Diagnosing Problems Table 4-1 Common Problems and Solutions (continued) Symptom No connectivity 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. 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. Unreadable characters on the management console Amber system LED • 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. • 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. 78-15136-02 Catalyst 3750 Switch Hardware Installation Guide 4-5

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4-5
Catalyst 3750 Switch Hardware Installation Guide
78-15136-02
Chapter 4
Troubleshooting
Diagnosing Problems
No connectivity
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.
•
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.
Unreadable characters on the
management console
Incorrect baud rate.
Reset the emulation software to
9600 baud.
Amber system LED
Fatal POST error detected.
Contact Cisco Systems.
Table 4-1
Common Problems and Solutions (continued)
Symptom
Possible Cause
Resolution