Specifications

2-15
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
Click Apply.
b. The entire DS-N circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.
Step 11 If the test traffic is not received or is poor quality, there is a problem with the DS-N card, the cabling
from the DS-N card, or the EIA. Test the DS-N cabling first, the DS-N card next, and the EIA last.
Step 12 To test the cabling:
a. Replace the suspect cabling (the cables from the test set to the EIA ports) with a known good cable.
b. If a known good cable is not available, you can test the suspect cable with a test set. Remove the
suspect cable from the EIA and connect the cable to the transmit (Tx) and receive (Rx) terminals of
the test set. Run traffic to determine whether this is a good cable.
c. Resend test set traffic on the loopback circuit with a known good cable installed.
d. If the circuit is now good, the problem was probably the defective cable. Replace this cable.
e. Skip to Step 18.
Step 13 To test the card:
a. Replace the suspect card with a known good card.
b. Resend test set traffic on the loopback circuit with a known good card.
c. If the circuit is now good, the problem was probably the defective card. Replace the defective card.
d. Return your defective card to Cisco. Call the Technical Assistance Center (TAC) at 1-877-323-7368
to open an RMA case.
Step 14 If the loopback test fails with a known good cable and a known good card, then the EIA is suspect. The
EIA may not be seated properly, for example, screws may be loose or missing. Remove and reinstall the
EIA to ensure a proper seating.
a. Remove the lower backplane cover, loosen the five screws that secure it to the ONS 15454 and pull
it away from the shelf assembly.
b. Loosen the nine perimeter screws that hold the backplane sheet metal cover(s) in place.
c. Lift the EIA panel by the bottom to remove it from the shelf assembly.
d. Follow the installation procedure for the appropriate EIA. Refer to the “EIA Replacement
Procedures” section on page 3-32.
Step 15 Repeat the facility loopback test for the DS-N card. If the test fails with the reinstalled EIA, call the
Cisco Technical Assistance Center (TAC) at 1-877-323-7368 to open an RMA case for the EIA.
Step 16 Replace the EIA.
Step 17 Resend test set traffic on the loopback circuit with known good cabling, a known good card, and the
replacement EIA. If the circuit is now good, the problem was probably the defective EIA.
Step 18 The entire DS-N circuit path has now passed its comprehensive series of loopback tests. This circuit
qualifies to carry live traffic.