5-3
Catalyst 3650 Switch Hardware Installation Guide
OL-29734-01
Chapter 5 Troubleshooting
Diagnosing Problems
• Verify that both the devices have power.
• Verify that you are using the correct cable type. For more information, see the “Connector
Specifications” section on page 2-1.
• Look for loose connections. Sometimes a cable appears to be seated but is not. Disconnect the cable
and then reconnect it.
10/100/1000 Port Connections
If a port appears to malfunction:
• Verify the status of all the ports. For more information, see the “Port LEDs and Modes” section on
page 1-21.
• Use the show interfaces privileged EXEC command to see if the port is error-disabled, disabled, or
shut down. Re-enable the port if necessary.
• Verify the cable type. For more information, see the “Connector Specifications” section on page 2-1.
PoE and PoE+ Port Connections
If a powered device connected to a PoE port does not receive power:
• Verify the status of all the ports. For more information, see the “Port LEDs and Modes” section on
page 1-21.
• Use the show interfaces privileged EXEC command to see if the port is error-disabled, disabled, or
shut down. Re-enable the port, if necessary.
• Verify that the power supply installed in the switch meets the power requirements of your connected
devices.
• Verify the cable type. 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 switch
by a crossover cable. Replace the crossover cable with a straight-through cable.
Caution Noncompliant cabling or powered devices might cause a PoE port fault. Use only compliant cabling to
connect Cisco prestandard IP phones, wireless access points, or IEEE 802.3af-compliant devices.
Note Ensure that the output of the PoE circuit has been evaluated as a limited power source (LPS) per IEC
60950.
SFP Modules
If SFP modules do not function correctly:
• Use only Cisco SFP modules.
• Inspect the uplink port and SFP module. If the module is faulty, replace the module.
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