Specifications

2-6
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
d. 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.
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 with a new EIA.
Step 17 Resend test set traffic on the loopback circuit with known good cabling, a known good card, and the
replacement EIA.
Step 18 If the circuit is now good, the problem was probably the defective EIA. Skip to the “Perform a Hairpin
on a Source Node” procedure on page 2-8.
Step 19 Clear any loopback before testing the next segment of the circuit path.
Procedure: Perform a Terminal Loopback on a Destination DS-N Card
This test is a terminal loopback performed on the fourth line card in the circuit; in the following example
the DS-N card in the destination node. First create a bidirectional circuit that starts on the source node
DS-N port and terminates on the destination node DS-N port, then proceed with the terminal loopback
test. Completing a successful terminal loopback to a destination node DS-N card verifies that the circuit
is good up to the destination DS-N.
Figure 2-5 Terminal loopback on a destination DS-N card
Caution Performing a loopback on an in-service circuit is service affecting.
Step 1 Test the test set with a hard loop if you have not already done so.
DS-N OC-N
XC
ONS 15454
Source
OC-N DS-N
XC
ONS 15454
Destination
DS-N
DS-N
Test Set A
Terminal loopbac
k
OC-N
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