Cisco ONS 15327 User Documentation page 371

Chapter 12 Maintenance
Procedure: Test the Hairpin Loopback Circuit
If the test set is not already sending traffic, send test-set traffic on the loopback circuit.
Step 1
Examine the test traffic received by the test set. Look for errors or any other signal information that the
Step 2
test set is capable of indicating.
If the test set indicates a good circuit, no further testing is necessary with the hairpin loopback circuit.
Step 3
a.
b.
If the test set indicates a faulty circuit, there may be a problem with the XTC card. Proceed to the
Step 4
the Alternate Source XTC Card" procedure on page
Procedure: Test the Alternate Source XTC Card
Perform a software reset on the active XTC card.
Step 1
Caution
Note
Resend test-set traffic on the loopback circuit. The test-set traffic now travels through the alternate XTC
Step 2
card.
If the test set indicates a faulty circuit, assume the XTC card is not causing the problem.
Step 3
a.
b.
If the test set indicates a good circuit, the problem may be a defective card. To confirm a defective
Step 4
original XTC card, proceed to the
Procedure: Retest the Original Source XTC Card
Perform a side switch of the XTC cards to make the original card the active card.
Step 1
Step 2 Resend test-set traffic on the loopback circuit.
If the test set indicates a faulty circuit on the original card, the problem is probably the defective card.
Step 3
a.
b.
June 2002
Clear the hairpin loopback circuit before testing the next segment of the network circuit path.
Proceed to the "Perform a Hairpin on a Destination Node XTC Card" procedure on page
XTC side switches are service-affecting. Any live traffic on any card in the node will endure
a hit of up to 50 ms.
After the active XTC goes into standby, the original standby slot becomes active. This causes
the ACT/STBY LED to become green on the former standby card.
Clear the loopback circuit before testing the next segment of the network circuit path.
Proceed to the "Perform a Hairpin on a Destination Node XTC Card" procedure on page
Return the defective card to Cisco through the returned materials authorization (RMA) process. Call
the Cisco Technical Assistance Center (TAC) at 1-877-323-7368 to open an RMA case.
Make sure the defective cross-connect card is replaced (such as with the former standby card, or with
another known-good card).
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"Retest the Original Source XTC Card" procedure on page
Cisco ONS 15327 User Documentation, R3.3
Network Test Procedures
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"Test
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