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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
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:
• 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:
• 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 “1.3.6 Perform a Facility Loopback on a Destination-Node OC-N Port” section on
page 1-35.
1.3.6 Perform a Facility Loopback on a Destination-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 destination node. Completing a successful facility loopback on this port
isolates the OC-N port as a possible failure point. Figure 1-17 shows an example of a facility loopback
on a destination node circuit source OC-N port.
Figure 1-17 Facility Loopback on a Destination Node OC-N Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Destination
ONS Node
OC-N OC-NXTC
Source
ONS Node
Intermediate
ONS Node
Test Set
OC-N XTC OC-N OC-N XTC OC-N
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