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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on a DS-N Circuit Path
c. Proceed to the “Perform a Cross-Connect Loopback on the Source OC-N Port” procedure on
page 1-23.
Step 4 If the test set indicates a faulty circuit, the problem might be a faulty card.
Step 5 Proceed to the “Test the XTC Card” procedure on page 1-7.
Procedure: Test the XTC Card
Step 1 Replace the suspect card with a card known to be good.
Step 2 Resend test traffic on the loopback circuit with a good card installed.
Step 3 If the test set indicates a good circuit, the problem is probably a defective card:
a. Return the defective card to Cisco through the returned materials authorization (RMA) process. Call
the Cisco TAC.
b. Replace the faulty card.
c. Clear the loopback:
• Click the Maintenance > Loopback tabs.
• Choose None from the Loopback Type column for the port being tested.
• Choose the appropriate state (IS, OOS, or OOS_AINS) from the State column for the port being
tested.
• Click the Apply button.
• Click the Yes button in the Confirmation Dialog box.
d. Proceed to the “Perform a Hairpin on a Source Node XTC Port” procedure on page 1-8.
Step 4 If the test set indicates a fault circuit, the problem might be faulty cabling from the MIC card to the XTC
card or a faulty MIC card.
Step 5 Proceed to the “Test the MIC Cabling” procedure on page 1-7.
Procedure: Test the MIC Cabling
Step 1 Replace the suspect cabling (the cables from the test set to the MIC or from the MIC to the XTC) with
a cable that is known to be good.
If a good cable is not available, test the suspect cable with a test set. Remove the suspect cable and
connect the cable to the Tx and Rx terminals of the test set. Run traffic to determine whether the cable
is good or defective.
Step 2 Resend test traffic on the loopback circuit with a cable that is known to be good installed.
Step 3 If the test set indicates a good circuit, the problem is probably the defective cable:
a. Replace the defective cable.