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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.6.4 Create a Terminal Loopback on Intermediate-Node FC_MR Ports
1.6.4 Create a Terminal Loopback on Intermediate-Node FC_MR Ports
In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate
whether the destination port is causing circuit trouble. In the example situation in Figure 1-41, the
terminal loopback is performed on an intermediate FC_MR port in the circuit. If you successfully
complete a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.
Figure 1-41 Terminal Loopback on an Intermediate-Node FC_MR Port
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 FC_MR Ports” procedure on
page 1-101.
Create a Terminal Loopback on Intermediate-Node FC_MR 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 “1.6.3 Create a Facility Loopback on an Intermediate-Node FC_MR Port”
section on page 1-99, 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 Create the terminal loopback on the destination port being tested:
a. Go to the node view of the intermediate node:
• Choose View > Go To Other Node from the menu bar.
• Choose the node from the drop-down list in the Select Node dialog box and click OK.
b. In node view, double-click the card that requires the loopback.
Destination
ONS Node
OC-N FC_MRXC
Source
ONS Node
Intermediate
ONS Node
OC-N OC-NXCOC-N
Test Set
FC_MR XC
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