Test The Terminal Loopback Circuit; Perform A Facility Loopback On An Intermediate-Node Oc-N Port - Cisco ONS 15310-CL Troubleshooting Manual

Chapter 1 General Troubleshooting
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Continue with the
Step 5

Test the Terminal Loopback Circuit

If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Examine the test traffic being received by the test set. Look for errors or any other signal information
Step 2
that the test set is capable of indicating.
If the test set indicates a good circuit, no further testing is necessary on the loopback circuit:
Clear the terminal loopback:
Step 3
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b.
c.
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e.
f.
Clear the terminal loopback circuit:
Step 4
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d.
If the test set indicates a faulty circuit, the problem might be a faulty port. Continue with the
Step 5
"1.3.4 Perform a Facility Loopback on an Intermediate-Node OC-N Port" procedure on page

1.3.4 Perform a Facility Loopback on an Intermediate-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 intermediate node. Completing a successful facility loopback on this port
isolates the OC-N port as a possible failure point.
Caution Performing a loopback on an in-service circuit is service-affecting.
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Click the Maintenance > Optical > Loopback > Port tabs.
Select OOS,MT from the Admin State column.
Select Terminal from the Loopback Type column.
Click Apply.
Click Yes in the confirmation dialog box.
"Test the Terminal Loopback Circuit" procedure on page
Double-click the card in the source node having the terminal loopback.
Click the Maintenance > Optical > Loopback > Port tabs.
Select None from the Loopback Type column for the port being tested.
Select the appropriate state (IS,AINS; OOS,DSBLD; or OOS,MT) in the Admin State column for
the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box.
1.3.4 Perform a Facility Loopback on an Intermediate-Node OC-N Port
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
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