Test And Clear The Facility (Line) Loopback Circuit - Cisco ONS 15454 Troubleshooting Manual

Chapter 1 General Troubleshooting
Note
Step 8 Complete the

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.
Double-click the card to open the card view.
Step 4 Depending upon the card type, click the Maintenance > Loopback tabs, Maintenance > DS1 tabs, or
Maintenance > DS3 tabs.
Step 5 Choose None from the Loopback Type column for the port being tested.
Step 6 Choose the appropriate state (IS, OOS, OOS_AINS) from the State column for the port being tested.
Step 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Step 9 Complete the
If the test set indicates a faulty circuit, the problem might be a faulty DS-N card, faulty cabling from the
DS-N card to the DSx panel or the EIA, or a faulty EIA.
Step 10 Complete the
Test the DS-N Cabling
Replace the suspected bad cabling (the cables from the test set to the DSx panel or the EIA ports) with
Step 1
a known-good cable.
If a known-good cable is not available, test the suspected bad cable with a test set. Remove the suspected
bad cable from the DSx panel or the EIA and connect the cable to the Tx and Rx terminals of the test
set. Run traffic to determine whether the cable is good or defective.
Resend test traffic on the loopback circuit with a known-good cable installed. If the test set indicates a
Step 2
good circuit, the problem was probably the defective cable.
Step 3 Replace the defective cable.
Step 4 In card view for the DS-N card, depending upon the type, click the Maintenance > Loopback tabs,
Maintenance > DS1 tabs, or Maintenance > DS3 tabs.
Step 5 Choose None from the Loopback Type column for the port being tested.
Step 6 Choose the appropriate state (IS, OOS, OOS_AINS) from the State column for the port being tested.
Click Apply.
Step 7
November 2004
It is normal for a "LPBKFACILITY (DS1, DS3)" condition on page 2-141
loopback setup. The condition clears when you remove the loopback.
"Test and Clear the Facility (Line) Loopback Circuit" procedure on page
"Perform a Hairpin Test on a Source Node Port (West to East)" procedure on page
"Test the DS-N Cabling" procedure on page
1.3.5 Perform a Facility (Line) Loopback on a Destination DS-N Port (East to West)
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Cisco ONS 15454 Troubleshooting Guide, R4.6
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