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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.6.6 Perform a Terminal Loopback on a Destination-Node Ethernet Port
Test and Clear the Ethernet Terminal Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being 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 on the loopback circuit. Clear the
terminal loopback from the port:
a. Double-click the intermediate-node CE100T-8 card with the terminal loopback.
b. Click the Maintenance > Loopback tabs.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (IS; OOS,DSBLD; OOS,MT) in the Admin State column for the port
being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 4 Clear the terminal 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.
The entire circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies
to carry live traffic.
Step 5 If the test set indicates a faulty circuit, the problem might be a faulty card.
Step 6 Complete the “Test the Ethernet Card” procedure on page 1-44.
Test the Ethernet 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 card.
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.
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 defective card.