Cisco ONS 15454 SDH Specifications download pdf (Page 85)

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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

Proceed to the “Test the Facility Loopback Circuit” section on page 2-5.

Procedure: Test the 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:

a. Clear the loopback circuit before testing the next segment of the network circuit path.

b. Proceed to the “Perform a Hairpin on a Source Node” section on page 2-6.

Step 4 If the test set indicates a faulty circuit, the problem may be a faulty E3-12 card, faulty cabling from the

E3-12 card to the DSx panel or the FMEC, or a faulty FMEC.

Proceed to the “Test the E3-12 Cabling” section on page 2-5.

Procedure: Test the E3-12 Cabling

Step 1 Replace the suspect cabling (the cables from the test set to the DSx panel or the FMEC ports) with a

known-good cable.

Step 2 If a known-good cable is not available, test the suspect cable with a test set. Remove the suspect cable

from the DSx panel or the FMEC and connect the cable to the transmit (Tx) and receive (Rx) terminals

of the test set. Run traffic to determine whether the cable is good or suspect.

Step 3 Resend test traffic on the loopback circuit with a known-good cable installed.

Step 4 If the test set indicates a good circuit, the problem was probably the defective cable.

a. Replace the defective cable.

b. Clear the loopback circuit before testing the next segment of the network circuit path.

c. Proceed to the “Perform a Hairpin on a Source Node” section on page 2-6.

Step 5 If the test set indicates a faulty circuit, the problem may be a faulty card or a faulty FMEC.

Proceed to the “Test the E3-12 Card” section on page 2-5.

Procedure: Test the 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 installed.

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Cisco ONS 15454 SDH Specifications Page 85