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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.4.2 Perform a Terminal Loopback on a Source-Node Optical Port
Step 6 Complete the “1.4.2 Perform a Terminal Loopback on a Source-Node Optical Port” procedure on
page 1-50.
1.4.2 Perform a Terminal Loopback on a Source-Node Optical Port
The terminal loopback test is performed on the source-node optical port. For the circuit in this example,
it is the source OC-N port in the source node. You first create a bidirectional circuit that starts on the
node destination optical port and loops back on the node source optical port. You then proceed with the
terminal loopback test. Completing a successful terminal loopback to a node source port verifies that the
circuit is good to the source port. Figure 1-22 shows an example of a terminal loopback on a source
OC-N port.
Figure 1-22 Terminal Loopback on a Source-Node OC-N Port
OC-N cards in terminal loopback state display an icon in CTC, shown in Figure 1-23.
Figure 1-23 Terminal Loopback Indicator
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Terminal loopbacks require on-site personnel.
Complete the “Create the Terminal Loopback on a Source-Node Optical Port” procedure on page 1-50.
Create the Terminal Loopback on a Source-Node Optical Port
Step 1 Connect an optical test set to the port you are testing:
Destination
ONS Node
OC-N OC-NXC
Source
ONS Node
Intermediate
ONS Node
OC-N OC-NXCOC-N
Test Set
OC-N XC
78784
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