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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.4.6 Perform a Facility Loopback on a Destination-Node Optical Port
1.4.6 Perform a Facility Loopback on a Destination-Node Optical Port
You perform a facility loopback test at the destination port to determine whether this local port is the
source of circuit trouble. The example in Figure 1-28 shows a facility loopback being performed on a
destination-node OC-N port.
Figure 1-28 Facility Loopback Path to a Destination-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 the Facility Loopback on a Destination-Node Optical Port” procedure on
page 1-63.
Create the Facility Loopback on a Destination-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 “1.4.5 Perform a Terminal Loopback on Intermediate-Node Optical Ports”
procedure on page 1-59, 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 hairpin circuit 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
OCN1toOCN5.
Destination
ONS Node
OC-N OC-NXC
Source
ONS Node
Intermediate
ONS Node
Test Set
OC-N XC OC-N OC-N XC OC-N
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