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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
b. Clear the facility 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.
c. 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 faulty circuit, the problem might be a faulty MIC card.
Step 5 Proceed to the “Test the MIC Card” procedure on page 1-8.
Procedure: Test the MIC Card
Step 1 Replace the suspect card with a good card. See the “Physically Replace a Card” procedure on page 2-130
for details.
Step 2 Resend test-set 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. See the “Physically Replace a Card” procedure on page 2-130 for details.
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.
Step 4 If the test set indicates a faulty circuit, repeat all of the facility loopback procedures.
Step 5 Proceed to the “1.2.2 Perform a Hairpin on a Source Node XTC Port” section on page 1-8.
1.2.2 Perform a Hairpin on a Source Node XTC Port
The hairpin test is performed on the first XTC card in the network circuit. A hairpin circuit uses the same
port for both source and destination. Completing a successful hairpin through this card isolates the
possibility that the source XTC card is the cause of the faulty circuit. Figure 1-8 on page 1-9 shows an
example of a hairpin circuit on a source node XTC port.
