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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.6.3 Perform a Facility Loopback on an Intermediate-Node OC-N Port
Note It is normal for the “LPBKFACILITY (OCN)” condition on page 2-103. The condition
clears when you remove the loopback.
Step 6 Complete the “Test and Clear the OC-N Facility Loopback Circuit” procedure on page 1-35.
Test and Clear the OC-N Facility Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test
set is capable of indicating.
Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the
facility loopback from the port:
a. Double-click the 15310-CL-CTX or CTX2500 card and click the Maintenance > Optical >
Loopback > Port tabs.
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (IS; OOS,DSBLD; OOS,MT) from the Admin State column for the port
being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 4 Clear the facility loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 5 Complete the “Test the OC-N (Controller) Card” procedure on page 1-35.
Test the OC-N (Controller) Card
Step 1 Complete the “Physically Replace a Card” procedure on page 2-154 for the suspected bad card and
replace it with a known-good one.
Caution Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. Refer to the procedures in the
“2.10.1 Protection Switching, Lock Initiation, and Clearing” section on page 2-147. For more
information, refer to the “Maintain the Node” chapter in the Cisco ONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide.
Step 2 Resend test traffic on the loopback circuit with a known-good card installed.