3-5
Catalyst 2970 Switch Hardware Installation Guide
OL-6422-01
Chapter 3 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-5
.
•
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 3-1
Common Problems and Their Solutions (continued)
Symptom
Possible Cause
Resolution
Summary of Contents for 2970 - Catalyst Switch
Page 4: ......
