Figure 12-13 Facility Loopback On A Source Xtc Card - Cisco ONS 15327 User Documentation

Network Test Procedures

Figure 12-13 Facility loopback on a source XTC card

Test Set A
Performing a loopback on an in-service circuit is service-affecting.
Caution
Loopbacks operate only on in-service ports.
Note
Procedure: Create the Facility Loopback on the Source XTC Card
Connect an electrical test set to the port you are testing. Use appropriate cabling to attach the transmit
Step 1
(Tx) and receive (Rx) terminals of the electrical test set to the MIC card, which will interface with the
XTC card. 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 Facility Loopback
If the test set is not already sending traffic, send test-set traffic on the loopback.
Step 1
Examine the traffic received by the test set. Look for errors or any other signal information that the test
Step 2
set is capable of indicating.
If the test set indicates a good loop, no further testing is necessary with the facility loopback. Clear the
Step 3
loopback circuit before testing the next segment of the network circuit path. Proceed to the
Hairpin Circuit on a Source Node XTC Card" procedure on page
If the test set indicates a faulty circuit, the problem may be a faulty MIC card, faulty XTC card, or faulty
Step 4
cabling from the DS-N port. Proceed to the
Cisco ONS 15327 User Documentation, R3.3
12-22
ONS 15327
Source
XTC
MIC
DS-N
DS-N
Facility loopback
It is normal for an alarm to appear during loopback setup. The alarm clears when you remove
the loopback.
"Test the Facility Loopback" procedure on page
OC-N OC-N
"Test the DS-N Cabling" procedure on page
Chapter 12
ONS 15327
Destination
XTC
MIC
12-22.
12-24.
Maintenance
"Perform a
12-23.
June 2002