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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.3.7 Perform a Terminal Loopback on a Destination-Node OC-N Port
Step 5 If the test set indicates a faulty circuit, the problem might be a faulty OC-N port. Continue with the
“1.3.7 Perform a Terminal Loopback on a Destination-Node OC-N Port” procedure on page 1-24.
1.3.7 Perform a Terminal Loopback on a Destination-Node OC-N Port
The terminal loopback test is performed on the destination OC-N port in the destination 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.
Caution Performing a loopback on an in-service circuit is service-affecting.
Create the Terminal Loopback on a Destination-Node OC-N Port
Step 1 Connect an optical test set to the port you are testing:
a. If you just completed the “1.3.6 Perform a Facility Loopback on a Destination-Node OC-N Port”
procedure on page 1-22, 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.
Step 2 Use CTC to set up the terminal loopback circuit on the port being tested:
a. Click the Circuits tab and click Create.
b. Give the circuit an easily identifiable name, such as OCN1toOCN6.
c. Set circuit Type and Size to the normal preferences, such as STS and STS1.
d. Leave the Bidirectional check box checked and click Next.
e. In the Circuit Source dialog box, fill in the source Node, Slot, Port, and Type where the test set is
connected and click Next.
f. In the Circuit Destination dialog box, fill in the destination Node, Slot, Port, and Type (the OC-N
port in the destination node) and click Finish.
Step 3 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Note It is normal for a 2.7.162 LPBKTERMINAL (OCN) condition to appear during a loopback
setup. The condition clears when you remove the loopback.
Step 4 Create the terminal loopback on the destination port being tested:
a. Go to the node view of the destination node:
• From the View menu, choose Go To Other Node.
• Choose the node from the drop-down list in the Select Node dialog box and click OK.