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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
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
Caution Performing a loopback on an Unlocked circuit is service-affecting.
Complete the “Create the Facility (Line) Loopback on the Source Optical Port” procedure on page 1-40.
Create the Facility (Line) Loopback on the Source 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.
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.
Step 2 In CTC node view, double-click the card to display the card view.
Step 3 Click the Maintenance > Loopback > Port tabs.
Step 4 Choose Locked,maintenance from the Admin State column for the port being tested. If this is a
multiport card, select the appropriate row for the desired port.
Step 5 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport
card, select the appropriate row for the desired port.
Step 6 Click Apply.
Step 7 Click Ye s in the confirmation dialog box.
Note It is normal for a “LPBKFACILITY (STM1E, STMN)” condition, page 2-170 to appear during
loopback setup. The condition clears when you remove the loopback.
Step 8 Complete the “Test and Clear the Facility (Line) Loopback Circuit” procedure on page 1-40.
Test and Clear the Facility (Line) Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Destination
ONS Node
STM-N STM-NXC
Source
ONS Node
Intermediate
ONS Node
STM-N STM-NXCSTM-N
Test Set
XCSTM-N
90599
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