Installation guide

Chapter 3 Troubleshooting
Diagnosing Problems
3-6
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
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.
Switch port in error-disabled
state after SFP module or
XENPAK module inserted
Bad or non-Cisco-approved SFP
module or XENPAK module.
Remove the SFP module or
XENPAK module from the
switch, and replace it with a
Cisco-approved module. Use the
errdisable recovery cause
gbic-invalid global
configuration command to
verify the port status, and enter a
time interval to recover from the
error-disable state.
See the switch command
reference guide for information
on the errdisable recovery
command.
Powered device connected to
PoE port, but no power given
Switch might not have enough power
capacity to deliver PoE to a new
powered device.
Use the Mode button to show the
PoE status for all ports.
• If the port status LED is
alternating green and
amber, connect the powered
device to an external AC
power source.
PoE might be disabled on switch
port.
• If the port status LED is
amber, configure the switch
port PoE setting to Auto.
Note PoE is enabled by
default.
Table 3-1 Common Problems and Solutions (continued)
Symptom Possible Cause Resolution