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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.4.4 Perform a Facility Loopback on an Intermediate-Node Optical Port
1.4.4 Perform a Facility Loopback on an Intermediate-Node Optical Port
Performing the facility loopback test on an intermediate port isolates whether this node is causing circuit
failure. In the situation shown in Figure 1-25, the test is being performed on an intermediate OC-N port.
Figure 1-25 Facility Loopback Path to an Intermediate-Node OC-N Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Facility loopbacks require on-site personnel.
Complete the “Create a Facility Loopback on an Intermediate-Node Optical Port” procedure on
page 1-57.
Create a Facility Loopback on an Intermediate-Node Optical Port
Step 1 Connect an optical test set to the port you are testing:
Note For specific procedures to connect, set up, and use the test set equipment, consult the
manufacturer.
a. If you just completed the “1.4.3 Perform an XC Loopback on the Source Optical Port” procedure
on page 1-53, leave the optical test set hooked up to the source-node port.
b. If you are starting the current procedure without the optical test set hooked up to the source port
port, use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you
are testing. Both Tx and Rx connect to the same port.
Step 2 Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3 Use CTC to set up the facility loopback on the test port:
a. In node view, click the Circuits tab and click Create.
b. In the Circuit Creation dialog box, choose the type, such as STS, and number, such as 1.
c. Click Next.
d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
OCN1toOCN3.
e. Leave the Bidirectional check box checked.
Destination
ONS Node
OC-N OC-NXC
Source
ONS Node
Intermediate
ONS Node
OC-N OC-NXC
Test Set
OC-N XC OC-N
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