Cisco ONS 15454 SDH Specifications Page 91

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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
Procedure: Test the Terminal Loopback Circuit on the Destination E3-12 Card
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being 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 on the loopback circuit.
a. Clear the loopback circuit before testing the next segment of the network circuit path.
b. Proceed to the “Perform a Facility Loopback on a Destination E3-12 Card” section on page 2-11.
Step 4 If the test set indicates a faulty circuit, the problem may be a faulty card.
Proceed to the “Test the Destination E3-12 Card” section on page 2-11.
Procedure: Test the Destination E3-12 Card
Step 1 Replace the suspect card with a known-good card.
Step 2 Resend test traffic on the loopback circuit with a known-good card.
Step 3 If the test set indicates a good circuit, the problem was probably the defective card.
a. Return the defective card to Cisco through the RMA process. Call the Cisco TAC at 1-800-553-2447
or login to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of
Cisco TAC toll-free numbers for your country to obtain more information to open an RMA case.
b. Replace the defective E3-12 card.
Proceed to the “Perform a Facility Loopback on a Destination E3-12 Card” section on page 2-11.
2.2.4 Perform a Facility Loopback on a Destination E3-12 Card
The final test is a facility loopback performed on the destination traffic card in the circuit, in this case
the E3-12 card in the destination node. Completing a successful facility loopback on this card eliminates
the possibility that the destination node cabling, E3-12 card, LIU, or FMEC card is responsible for a
faulty circuit. Figure 2-9 shows an example of a facility loopback on a destination E3-12 card.
Figure 2-9 Facility loopback on a destination E3-12 card
ONS 15454
Source
ONS 15454
Destination
76172
DS-N OC-NXC
OC-N DS-NXC
Test Set
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