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Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on an OC-N Circuit Path
• 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.
b. 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 OC-N card.
Step 5 Proceed to the “Test the OC-N Card” procedure on page 1-23.
Procedure: Test the OC-N Card
Step 1 Replace the suspect card with a card known to be good. See the “Physically Replace a Card” procedure
on page 2-130 for details.
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 the defective card:
a. Return the defective card to Cisco through the returned materials authorization (RMA) process.
Contact the Cisco TAC.
b. Replace the faulty card. See the “Physically Replace a Card” procedure on page 2-130 for details.
c. 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.
Step 4 Proceed to the “1.3.2 Perform a Cross-Connect Loopback on the Source OC-N Port” section on
page 1-23.
1.3.2 Perform a Cross-Connect Loopback on the Source OC-N Port
The cross-connect loopback test occurs on the cross-connect card (XCT) in a network circuit. A
cross-connect loopback circuit uses the same port for both source and destination. Completing a
successful cross-connect loopback through the XCT card isolates the possibility that the XCT card is the
cause of the faulty circuit. Figure 1-13 on page 1-24 shows an example of a cross-connect loopback on
a source OC-N port.