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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.6.4 Perform a Terminal Loopback on Intermediate-Node OC-N Ports
Step 3 If the test set indicates a good circuit, the problem was probably the defective card. Return the defective
card to Cisco through the RMA process. Contact Cisco Technical Support (1 800 553-2447).
Step 4 Complete the “Physically Replace a Card” procedure on page 2-154 for the faulty card.
Step 5 Clear the facility loopback from the port:
a. Double-click the 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 6 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 7 Complete the “1.6.4 Perform a Terminal Loopback on Intermediate-Node OC-N Ports” procedure on
page 1-36.
1.6.4 Perform a Terminal Loopback on Intermediate-Node OC-N Ports
In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate
whether the destination port is causing circuit trouble. To do this, you create a bidirectional circuit that
originates on the source-node Ethernet port and loops back on the intermediate-node port. You then
proceed with the terminal loopback test. If you successfully complete a terminal loopback on the node,
this node is excluded from possible sources of circuit trouble.
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Terminal loopbacks require on-site personnel.
Complete the “Create a Terminal Loopback on Intermediate-Node OC-N Ports” procedure on page 1-37.