Cisco ONS 15327 User Documentation page 377

Chapter 12 Maintenance
Procedure: Create the Facility Loopback on a Destination XTC Card
Connect an electrical test set to the port you are testing. Use appropriate cabling to attach the electrical
Step 1
test set transmit (Tx) and receive (Rx) terminals to the MIC connectors for the port you are testing. Both
transmit (Tx) and receive (Rx) connect to the same port. Adjust the test set accordingly.
Set the port into facility loopback mode.
Step 2
Note
Proceed to the
Step 3
Procedure: Test the Destination Facility Loopback
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 loopback circuit. Clear the
Step 3
facility loopback. The entire DS-N circuit path has now passed its comprehensive series of loopback
tests. This circuit qualifies to carry live traffic.
If the test set indicates a faulty circuit, the problem may be a faulty MIC card, faulty cabling from the
Step 4
MIC card. Proceed to the
Procedure: Test the DS-N Cabling
Replace the suspect cabling (the cables from the test set to the MIC ports) with a known-good cable.
Step 1
If a known-good cable is not available, test the suspect cable with a test set. Remove the suspect cable
Step 2
from the MIC 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.
Resend test-set traffic on the loopback circuit with a known-good cable installed.
Step 3
If the test set indicates a good circuit, the problem was probably the defective cable. The entire DS-N
Step 4
circuit path has now passed its comprehensive series of loopback tests. This circuit qualifies to carry live
traffic.
a.
b.
If the test set indicates a faulty circuit, the problem may be a faulty card. Proceed to the
Step 5
Card" procedure on page
June 2002
It is normal for an alarm to appear during loopback setup. The alarm clears when you remove
the loopback.
"Test the Destination Facility Loopback" procedure on page
"Test the DS-N Cabling" procedure on page
Make sure the faulty cable is replaced with known-good cable (such as the cable used for testing or
another cable which has been tested before installation).
Clear the loopback circuit before testing the next segment of the network circuit path.
12-32.
Network Test Procedures
12-31.
12-23.
Cisco ONS 15327 User Documentation, R3.3
"Test the XTC
12-31