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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.3.6 Perform a Facility (Line) Loopback on a Destination-Node Optical Port
b. In node view, double-click the card that requires the loopback, such as the destination-node optical,
G-Series, MXP, or TXP card.
c. Click the Maintenance > Loopback > Port tabs.
d. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row
appropriate for the desired port.
e. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
f. Click Apply.
g. Click Yes in the confirmation dialog box.
Note It is normal for the “LPBKFACILITY (STM1E, STMN)” condition, page 2-170 to appear during
a loopback setup. The condition clears when you remove the loopback.
Step 6 Complete the “Test and Clear the Facility (Line) Loopback Circuit” procedure on page 1-50.
Test the Optical 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 loopback on the port:
a. Click the Maintenance > Loopback > Port tabs.
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.
Step 4 Clear the facility loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 5 Complete the “Test the Optical Card” procedure on page 1-58.
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