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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.4.6 Perform a Terminal Loopback on a Destination-Node Ethernet Port
e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
f. Click Apply.
g. Click Yes in the confirmation dialog box.
Step 6 Complete the “Test and Clear the Ethernet Terminal Loopback Circuit” procedure on page 1-79.
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 card with the terminal loopback.
b. Click the Maintenance > Loopback tab.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) 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 1-79.
Test the Ethernet Card
Step 1 Complete the “Physically Replace a Traffic Card” procedure on page 2-271 for the suspected bad card
and replace it with a known-good card.
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