User Guide

1-14
Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on a DS-N Circuit Path
Step 4 If the test set indicates a faulty circuit, the problem might be a faulty card.
Step 5 Proceed to the “Test the Destination XTC Card” procedure on page 1-14.
Procedure: Test the Destination XTC 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.
Step 3 If the test set indicates a good circuit, the problem is probably the defective card:
a. Return the defective card to Cisco through the returned materials authorization (RMA) process. Call
the Cisco TAC.
b. Replace the defective XTC card. See the “Physically Replace a Card” procedure on page 2-130 for
details.
c. Clear the terminal loopback:
• Double-click the DS-N card in the destination node with the terminal loopback.
• Click the Maintenance > Loopback tabs.
• Select None from the Loopback Type column for the port being tested.
• Select the appropriate state (IS, OOS, or OOS_AINS) in the State column for the port being
tested.
• Click the Apply button.
• Click the Yes button in the Confirmation Dialog box.
d. Clear the terminal loopback circuit:
• Click the Circuits tab.
• Choose the loopback circuit being tested.
• Click the Delete button.
• Click the Yes button in the Delete Circuits dialog box.
Step 4 Proceed to the “1.2.4 Perform a Hairpin on a Destination Node XTC Port” section on page 1-14.
1.2.4 Perform a Hairpin on a Destination Node XTC Port
The hairpin test is preformed on the XTC card in the destination node. To perform this test, you must
also create a bidirectional circuit from the source MIC card to the source OC-N node in the transmit
direction. Creating the bidirectional circuit and completing a successful hairpin isolates the possibility
that the source and destination OC-N cards, the source and destination XTC cards, or the fiber span is
responsible for the faulty circuit. Figure 1-10 on page 1-15 shows an example of a hairpin circuit on a
destination node XTC card.