1-29
Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on an OC-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 OC-N Card” procedure on page 1-29.
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.
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 defective OC-N card. See the “Physically Replace a Card” procedure on page 2-130 for
details.
c. Clear the terminal loopback before testing the next segment of the network circuit path:
• Double-click the OC-N card in the source 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 before testing the next segment of the network circuit path:
• 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 “1.3.4 Perform a Facility Loopback on an Intermediate-Node OC-N Port” section on
page 1-29.
1.3.4 Perform a Facility Loopback on an Intermediate-Node OC-N Port
The facility loopback test is performed on the node source port in the network circuit, in this example,
the source OC-N port in the intermediate node. Completing a successful facility loopback on this port
isolates the OC-N port as a possible failure point. Figure 1-15 on page 1-30 shows an example of a
facility loopback on a intermediate node circuit source OC-N port.
