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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 2 General Troubleshooting
Identify Points of Failure on a Circuit Path
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 hairpin circuit.
a. Clear the hairpin circuit before testing the next segment of the network circuit path.
b. Proceed to the “Perform a Terminal Loopback on a Destination E3-12 Card” section on page 2-9.
Step 4 If the test set indicates a faulty circuit, there may be a problem with the cross-connect card.
Proceed to the “Test the Alternate Cross-Connect Card” section on page 2-8.
Procedure: Test the Alternate 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 screen, the
ACT/STBY LED of the standby cross-connect card is amber and the ACT/STBY LED of the active
cross-connect card is green.
b. Position the cursor over the standby cross-connect card.
c. Right-click to choose RESET CARD.
Step 2 Do a manual switch (side switch) of the cross-connect cards before retesting the loopback circuit:
Caution Cross-connect manual switches (side switches) are service-affecting. Any live traffic on any
card in the node endures a hit of up to 50 ms.
a. Determine the standby cross-connect card. The ACT/STBY LED of the standby cross-connect card
is amber and the ACT/STBY LED of the active cross-connect card is green.
b. In the node view, select the Maintenance > XC Cards tabs.
c. From the Cross Connect Cards menu, choose Switch.
d. Click Yes on the Confirm Switch dialog box.
Note After the active cross-connect goes into standby, the original standby slot becomes active.
This causes the ACT/STBY LED to become green on the former standby card.
Step 3 Resend test traffic on the loopback circuit.
The test traffic now travels through the alternate cross-connect card.
Step 4 If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem.
a. Clear the loopback circuit before testing the next segment of the network circuit path.
b. Proceed to the “Perform a Terminal Loopback on a Destination E3-12 Card” section on page 2-9.
Step 5 If the test set indicates a good circuit, the problem may be a defective card.
To confirm a defective original cross-connect card, proceed to the “Retest the Original Cross-Connect
Card” section on page 2-9.
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