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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)
Caution Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or
Force switch to the target loopback port. For basic instructions, refer to the “2.10.2 Protection
Switching, Lock Initiation, and Clearing” section on page 2-260. For more information about these
operations, refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, “Maintain the Node.”
Complete the “Create a Facility (Line) Loopback Circuit on a Destination Electrical Port” procedure on
page 1-25. Then test and clear the loopback as instructed.
Create a Facility (Line) Loopback Circuit on a Destination Electrical Port
Step 1 Connect an electrical test set to the port you are testing.
a. If you just completed the “1.2.4 Perform a Terminal (Inward) Loopback on a Destination Electrical
Port (West to East)” procedure on page 1-21, leave the electrical test set hooked up to the
destination-node port.
b. If you are starting the current procedure without the electrical test set hooked up to the destination
port, use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the
electrical connection panel or the FMEC connectors for the port you are testing. Both Tx and Rx
connect to the same port.
Step 2 Adjust the test set accordingly.
Step 3 In node view, double-click the destination electrical card to display the card view.
Step 4 Click the Maintenance > Loopback tabs.
Step 5 Choose Locked,maintenance from the Admin State column.
Step 6 Select Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport
card, select the row appropriate for the desired port.
Step 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Note It is normal for a “LPBKFACILITY (DS3)” condition, page 2-167 or “LPBKFACILITY (E1, E3,
E4)” condition, page 2-167 to appear during loopback setup. The condition clears when you
remove the loopback.
Step 9 Complete the “Test and Clear the Facility (Line) Loopback Electrical Circuit” procedure on page 1-25.
Test and Clear the Facility (Line) Loopback Electrical Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test 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 loopback circuit.
Double-click the card to display the card view.
Step 4 Click the Maintenance > Loopback tabs.
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