Installation guide

3-3
Catalyst 3560 Switch Hardware Installation Guide
OL-6337-03
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 the reverse.
• 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 instead of
straight-through cables, see
the “Two Twisted-Pair
Cable Pinouts” section on
page B-4.
• Enable the automatic
medium-dependent-
interface crossover
(Auto-MDIX) feature.
Note Many legacy powered
devices, including older
Cisco IP phones and
access points that do not
fully support IEEE
802.3af, might not
support PoE when
connected to the
switches by a crossover
cable.
• 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