Cisco ONS 15454 Troubleshooting Manual page 38

1.5.1 Perform a Facility (Line) Loopback on a Source-Node G-Series, MXP, OC-N, or TXP Port
1.5.1 Perform a Facility (Line) Loopback on a Source-Node G-Series, MXP,
OC-N, or TXP Port
The facility (line) loopback test is performed on the node source port in the network circuit. In the testing
situation used in this example, the source OC-N port in the source node. Completing a successful facility
(line) loopback on this port isolates the OC-N port as a possible failure point.
example of a facility loopback on a circuit source OC-N port. G-Series Ethernet ports, TXPs, and MXPs
are tested similarly.
Note Facility (line) loopbacks are not available for G-Series cards prior to software R4.1.
Figure 1-20 Facility (Line) Loopback on a Circuit Source OC-N Port
Source
ONS Node
OC-N
Test Set
Performing a loopback on an in-service circuit is service-affecting.
Caution
Create the Facility (Line) Loopback on the Source Port
Note This procedure does not apply to Software R4.6 E-Series Ethernet, ML-Series Ethernet, and DWDM
cards.
Step 1 Connect an optical test set to the port you are testing.
Note
Use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. The Tx and Rx terminals connect to the same port. Adjust the test set accordingly.
Step 2 In CTC node view, double-click the card to open the card view.
Step 3 Click the Maintenance > Loopback tabs.
Choose OOS_MT from the State column for the port being tested. If this is a multiport card, select the
Step 4
appropriate row for the desired port.
Step 5 Choose Facility (Line) from the Loopback Type column for the port being tested. If this is a multiport
card, select the appropriate row for the desired port.
Step 6 Click Apply.
Cisco ONS 15454 Troubleshooting Guide, R4.6
1-38
XC OC-N
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
Intermediate
ONS Node
OC-N XC OC-N
Chapter 1 General Troubleshooting
Figure 1-20 shows an
Destination
ONS Node
OC-N XC OC-N
November 2004