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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.3.5 Perform a Terminal Loopback on an Intermediate-Node OC-N Port
Test the 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.
If the test set indicates a good circuit, no further testing is necessary with the facility loopback:
Step 3 Clear the facility loopback:
a. 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,AINS; OOS,DSBLD; or 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.
Step 5 If the test set indicates a faulty circuit, the problem might be a faulty OC-N port. Continue with the
“1.3.5 Perform a Terminal Loopback on an Intermediate-Node OC-N Port” procedure on page 1-20.
1.3.5 Perform a Terminal Loopback on an Intermediate-Node OC-N Port
The terminal loopback test is performed on the node destination port in the circuit, in this example, the
destination OC-N port in the intermediate node. First, create a bidirectional circuit that starts on the node
source OC-N port and loops back on the node destination OC-N port. Then continue with the terminal
loopback test. Completing a successful terminal loopback to a node destination OC-N port verifies that
the circuit is good up to the destination OC-N port.
Caution Performing a loopback on an in-service circuit is service-affecting.
Create the Terminal Loopback on an Intermediate-Node OC-N Port
Step 1 Connect an optical test set to the port you are testing:
a. If you just completed the “1.3.4 Perform a Facility Loopback on an Intermediate-Node OC-N Port”
procedure on page 1-18, leave the optical test set connected to the OC-N port in the source node.
b. If you are starting the current procedure without the optical test set connected to the OC-N port, use
appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing.
c. Adjust the test set accordingly.