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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
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 OCN1toOCN4.
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 intermediate 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 intermediate 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.
b. In node view, double-click the controller card (15310-CL-CTX or CTX2500) with the OC-N port
requiring a loopback.
c. Click the Maintenance > Optical > Loopback > Port tabs.
d. Select OOS,MT from the Admin State column.
e. Select Terminal from the Loopback Type column.
f. Click Apply.
g. Click Yes in the confirmation dialog box.
Step 5 Continue with the “Test the Terminal Loopback Circuit” procedure on page 1-21.
Test the 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.
If the test set indicates a good circuit, no further testing is necessary on the loopback circuit.
Step 3 Clear the terminal loopback:
a. Double-click the card with the loopback.
b. Click the Maintenance > Optical > Loopback > Port tabs.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (IS,AINS; OOS,DSBLD; or OOS,MT) in the Admin State column for
the port being tested.