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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
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.
d. Clear the facility 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 “1.3.5 Perform a Terminal Loopback on an Intermediate-Node OC-N Port” section on
page 1-32.
1.3.5 Perform a Terminal Loopback on an Intermediate-Node OC-N Port
The terminal loopback test is performed on the node destination port in the circuit, in this example, the
destination OC-N port in the intermediate node. First, create a bidirectional circuit that starts on the node
source OC-N port and loops back on the node destination OC-N port. Then proceed with the terminal
loopback test. Completing a successful terminal loopback to a node destination OC-N port verifies that
the circuit is good up to the destination OC-N port. Figure 1-16 on page 1-33 shows an example of a
terminal loopback on an intermediate node destination OC-N port.