Filter
Top Products
1-17
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.3.3 Perform a Terminal Loopback on a Source-Node OC-N Port
Step 4 If the test set indicates a faulty circuit, there might be a problem with the cross-connect portion of the
15310-CL-CTX or CTX2500. Complete the “1.3.3 Perform a Terminal Loopback on a Source-Node
OC-N Port” procedure on page 1-17.
1.3.3 Perform a Terminal Loopback on a Source-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 source 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. Performing a loopback on an in-service circuit is
service-affecting.
Create the Terminal Loopback on a Source Node OC-N Port
Step 1 Connect an optical test set to the port you are testing:
a. If you just completed the “1.3.2 Perform a Cross-Connect Loopback on the Source OC-N Port”
procedure on page 1-15, 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 OCN1toOCN2.
c. Set circuit Type and Size to the normal preferences, such as STS and STS1.
d. Verify that Bidirectional is checked.
e. Click Next.
f. In the Circuit Source dialog box, fill in the same Node, Slot, Port, and Type where the test set is
connected and click Next.
g. In the Circuit Destination dialog box, fill in the destination Node, Slot, Port, and Type (the OC-N
port in the source 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. In node view, double-click the card that requires the loopback.
b. Click the Maintenance > Optical > Loopback > Port tabs.
c. Select OOS,MT from the Admin State column.