4-7
Catalyst 3750 Switch Hardware Installation Guide
78-15136-03
Chapter 4 Troubleshooting
Diagnosing Problems
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 or XENPAK
inserted
Bad or non-Cisco-approved SFP or
XENPAK module.
Remove the SFP 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.
Refer to 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 4-1 Common Problems and Solutions (continued)
Symptom Possible Cause Resolution
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