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1.3.1 Perform a Facility (Line) Loopback on a Source-Node Optical Port
Figure 1-19
Facility Loopback on a Circuit Source STM-N Port
Source
ONS Node
STM-N
Test Set
Performing a loopback on an Unlocked circuit is service-affecting.
Caution
Complete the
Create the Facility (Line) Loopback on the Source Optical Port
Connect an optical test set to the port you are testing.
Step 1
Note
Use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. The Tx and Rx terminals connect to the same port. Adjust the test set accordingly.
In CTC node view, double-click the card to display the card view.
Step 2
Click the Maintenance > Loopback > Port tabs.
Step 3
Choose Locked,maintenance from the Admin State column for the port being tested. If this is a
Step 4
multiport card, select the appropriate row for the desired port.
Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport
Step 5
card, select the appropriate row for the desired port.
Click Apply.
Step 6
Click Yes in the confirmation dialog box.
Step 7
Note
Complete the
Step 8
Test and Clear the Facility (Line) Loopback Circuit
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-40
XC
STM-N
"Create the Facility (Line) Loopback on the Source Optical Port" procedure on page
Refer to the manufacturer's instructions for detailed information on connection and setup of the
optical test set.
It is normal for a
"LPBKFACILITY (STM1E, STMN)" condition, page 2-170
loopback setup. The condition clears when you remove the loopback.
"Test and Clear the Facility (Line) Loopback Circuit" procedure on page
Intermediate
ONS Node
STM-N
XC
STM-N
Chapter 1
General Troubleshooting
Destination
ONS Node
STM-N
XC
STM-N
to appear during
1-40.
July 2005
1-40.
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