C H A P T E R
4
Troubleshoot
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Troubleshooting Common Issues, on page 55
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Cisco Catalyst PON Series OLT Troubleshooting, on page 56
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Cisco Catalyst PON Series ONT Troubleshooting, on page 58
Troubleshooting Common Issues
The following section provide information about how to troubleshoot common issues in the Cisco Catalyst
PON Series Switches.
Bad or Damaged Cable
Always examine the cable for marginal damage or failure. A cable might appear physically good, but it could
corrupt packets as a result of subtle damage to the wiring or connectors. You can identify this situation because
of packet errors occurring at the port or the port constantly flapping.
Perform the following checks on the cable:
• Examine or exchange the copper or fiber-optic cable with a working cable.
• Look for broken or missing pins on cable connectors.
• Rule out any bad patch panel connections or media convertors between the source and the destination.
If possible, bypass the patch panel, or eliminate faulty media convertors (fiber-optic-to-copper).
• Test the cable in another port or interface, if possible, to identify if the fault is with 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 Mbps UTP connections. Use either Category 5, Category
5e, or Category 6 UTP for 10/100/1000 Mbps connections.
• For fiber-optic cables, verify that you have the correct cable for distance and port type. Ensure that the
connected device ports match and use the same type of encoding, optical frequency, and fiber type.
• For copper connections, determine if a crossover cable was used when a straight-through was required,
or the reverse. Enable auto-MDIX on the device, or replace the cable.
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