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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.7 Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit
Step 3 Use CTC to put the circuit being tested out of service:
a. In node view, click the Circuits tab.
b. Click the circuit and then click Edit.
c. In the Edit Circuit dialog box, click the State tab.
d. Choose Locked,maintenance from the Target Circuit State drop-down list.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 4 Use CTC to set up the XC loopback on the circuit being tested:
a. In node view, double-click the optical card to display the card view.
b. Click the Maintenance > Loopback > VC4 tabs.
c. Click the XC Loopback column check box for the port being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 5 Complete the “Test and Clear the XC Loopback Circuit” procedure on page 1-33.
Test and Clear the XC Loopback Circuit
Note This procedure is performed only on STM-N cards.
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 cross-connect. Clear the
XC loopback:
a. In card view, click the Maintenance > Loopback > VC4 tabs.
b. Uncheck the check box in the XC Loopback column for the circuit being tested.
c. Click Apply.
d. Click Yes in the confirmation dialog box.
Step 4 Complete the “Test the Standby XC-VXL Cross-Connect Card” procedure on page 1-33.
Test the Standby XC-VXL Cross-Connect Card
Step 1 Perform a reset on the standby cross-connect card:
a. Determine the standby cross-connect card. On both the physical node and the CTC node view
window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED
is green.
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