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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.3.4 Perform a Facility (Line) Loopback on an Intermediate-Node Optical Port
Figure 1-23 Facility Loopback Path to an Intermediate-Node STM-N Port
Caution Performing a loopback on an Unlocked circuit is service-affecting.
Complete the “Create the Facility (Line) Loopback on an Intermediate-Node Optical Port” procedure on
page 1-49.
Create the Facility (Line) Loopback on an Intermediate-Node Optical Port
Step 1 Connect an optical test set to the port you are testing:
Note Refer to the manufacturer’s instructions for detailed information on connection and setup of the
optical test set.
a. If you just completed the “1.3.3 Perform an XC Loopback on the Source Optical Port” procedure
on page 1-45, 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-node
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.
Step 3 Use CTC to set up the facility (line) 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 and size, such as a VC HO.
c. Click Next.
d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
STMN1toSTMN3.
e. Leave the Bidirectional check box checked. Leave the default value for State.
f. Click Next.
g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the
test set is connected.
h. Click Next.
i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for
the source dialog box.
j. Click Next.
Destination
ONS Node
STM-N STM-NXC
Source
ONS Node
Intermediate
ONS Node
STM-N STM-NXC
Test Set
STM-N XC STM-N
90597
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