Ethernet And Fiber-Optic Cables; Link Status; 10/100/1000 Port Connections; 10/100/1000 Poe+ Port Connections - Cisco C1000-8T-2G-L Installation Manual

Ethernet and Fiber-Optic Cables

• Try the cable in another port or interface, if possible, to see if the problem follows the cable.
Ethernet and Fiber-Optic Cables
Make sure that you have the correct cable for the connection.
• For Ethernet, use Category 3 copper cable for 10 Mb/s UTP connections. Use either Category 5, Category
• For fiber-optic cables, verify that you have the correct cable for distance and port type. Ensure that the
• For copper connections, determine if a crossover cable was used when a straight-through was required

Link Status

Verify that both sides have link. A single broken wire or a shutdown port can cause one side to show link
even though the other side does not have link.
A port LED that is on does not guarantee that the cable is fully functional. The cable might have encountered
physical stress that causes it to function at a marginal level. If the port LED does not turn on:
• Connect the cable from the switch to a known good device.
• Ensure that both ends of the cable are connected to the correct ports.
• Verify that both devices have power.
• Verify that you are using the correct cable type.
• Check for loose connections. Sometimes a cable appears to be seated, but is not. Disconnect the cable

10/100/1000 Port Connections

A port appears to malfunction:
• Use the show hardware led port status privileged EXEC command to check the status for all ports.
• Use the show interfaces privileged EXEC command to see if the port is error-disabled, disabled, or

10/100/1000 PoE+ Port Connections

A powered device connected to a PoE port does not receive power:
• Use the show hardware led port power privileged EXEC command to show the PoE status for all ports.
• Use the show interfaces privileged EXEC command to see if the port is in error-disabled, disabled, or
• Verify that there is sufficient PoE power budget to provide power to the attached device. Use the show
Cisco Catalyst 1000 Series 8-Port and 16-Port Switch Hardware Installation Guide
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5e, or Category 6 UTP for 10/100/1000 Mb/s connections.
connected device ports match and use the same type of encoding, optical frequency, and fiber type.
or the reverse. Enable auto-MDIX on the switch, or replace the cable.
and then reconnect it.
shutdown. Reenable the port if necessary.
shutdown. Reenable the port if necessary.
power inline global configuration command to check on the available PoE power budget.
Troubleshooting