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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 1 General Troubleshooting
1.3 Identify Points of Failure on an OC-N Circuit Path
d. Click Apply.
e. Click Yes in the confirmation dialog box.
The entire DS-N circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
1.3 Identify Points of Failure on an OC-N Circuit Path
Using facility loopbacks, terminal loopbacks, and cross-connect loopback circuits, you can test OC-N
facilities or STSs on the ONS 15310-CL or ONS 15310-MA to logically isolate faults. For this purpose,
you perform a loopback test at each point along the circuit path to systematically isolate a point of
failure.
The example in this section tests an OC-N circuit on a three-node path protection. Using a series of
facility loopbacks and terminal loopbacks, the path of the circuit is traced and the possible points of
failure are tested and eliminated. A logical progression of seven network test procedures applies to this
sample scenario:
1. Facility loopback on the source-node OC-N port
2. Cross-connect loopback on the source-node OC-N port
3. Terminal loopback on the source-node OC-N port
4. Facility loopback on the intermediate-node OC-N port
5. Terminal loopback on the intermediate-node OC-N port
6. Facility loopback on the destination-node OC-N port
7. Terminal loopback on the destination-node OC-N port
Note The test sequence for your circuits differs according to the type of circuit and network topology.
Note Facility and terminal loopback tests require on-site personnel.
1.3.1 Perform a Facility Loopback on a Source-Node OC-N Port
The facility loopback test is performed on the node source port in the network circuit, in this example,
the source 15310-CL-CTX or CTX2500 OC-N port in the source node. Completing a successful facility
loopback on this port isolates the OC-N port as a possible failure point. Performing a loopback on an
in-service circuit is service-affecting.
Create the Facility Loopback on the Source OC-N Port
Step 1 Connect an optical test set to the port you are testing.
Use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing.