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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.4.5 Perform a Terminal Loopback on Intermediate-Node Optical Ports
bidirectional circuit that originates on the source-node optical port and loops back on the
intermediate-node port. You then proceed with the terminal loopback test. If you successfully complete
a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.
Figure 1-26 Terminal Loopback Path to an Intermediate-Node OC-N Port
OC-N cards placed in facility loopback state display an icon, shown in Figure 1-27.
Figure 1-27 Facility Loopback Indicator
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Terminal loopbacks require on-site personnel.
Complete the “Create a Terminal Loopback on Intermediate-Node Optical Ports” procedure on
page 1-60.
Create a Terminal Loopback on Intermediate-Node Optical Ports
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 “1.4.4 Perform a Facility Loopback on an Intermediate-Node Optical
Port” section on page 1-57, 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,
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 terminal 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.
Destination
ONS Node
OC-N OC-NXC
Source
ONS Node
Intermediate
ONS Node
OC-N
Test Set
OC-N XC OC-N OC-N XC
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