1-11
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.1 Perform a Facility (Line) Loopback on a Source Electrical Port (West to East)
Step 7 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 port being tested.
Step 8 Click Apply.
Step 9 Click Yes in the confirmation dialog box.
Note It is normal for the “LPBKFACILITY (DS3)” condition on page 2-167 to appear during
loopback setup. The condition clears when you remove the loopback.
Step 10 Complete the “Test and Clear the Electrical Port Facility Loopback Circuit” procedure on page 1-11.
Test and Clear the Electrical Port Facility 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 display the card view.
Step 4 Depending upon the card type, click the Maintenance > Loopback tab.
Step 5 Choose None from the Loopback Type column for the port being tested.
Step 6 Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Step 7 Click Apply.
Step 8 Click Yes in the confirmation dialog box.
Step 9 Complete the “Test the Electrical Cabling” procedure on page 1-11.
Test the Electrical Cabling
Step 1 Replace the suspected bad cabling (the cables from the test set to the electrical connection panel or the
FMEC card ports) with 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 electrical connection panel or the FMEC card 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.
Step 2 Replace the defective cable.
Step 3 Click the Maintenance > Loopback tabs.
Note The DS-3 Admin State is the basis of the DS-1 Derived State.
Step 4 Choose None from the Loopback Type column for the port being tested.
To Next Page
Loading...
