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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.4.1 Perform a Facility (Line) Loopback on a Source-Node Ethernet Port
Complete the “Create the Facility (Line) Loopback on the Source-Node Ethernet Port” procedure on
page 1-63.
Create the Facility (Line) Loopback on the Source-Node Ethernet Port
Step 1 Connect an optical test set to the port you are testing.
Note Refer to the manufacturer’s instructions for detailed information about 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.
Step 2 Adjust the test set accordingly.
Step 3 In CTC node view, double-click the card to display the card view.
Step 4 Click the Maintenance > Loopback tab.
Step 5 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 6 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 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Note It is normal for a “LPBKFACILITY (G1000)” condition on page 2-169 to appear during
loopback setup. The condition clears when you remove the loopback.
Step 9 Complete the “Test and Clear the Facility (Line) Loopback Circuit” procedure on page 1-63.
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.
Step 2 Examine the traffic received by the test set. Look for errors or any other signal information that the test
set is capable of indicating.
Step 3 If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the
facility (line) loopback:
a. Click the Maintenance > Loopback tab.
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
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