Cisco ONS 15454 SDH - Perform a Facility (Line) Loopback on a Destination-Node MXP;TXP;FC_MR Port

1-91
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.5 Perform a Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the
Admin State column for the port being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 Complete the “1.5.5 Perform a Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR
Port” procedure on page 1-91.
1.5.5 Perform a Facility (Line) Loopback on a Destination-Node
MXP/TXP/FC_MR Port
You perform a facility (line) loopback test at the destination port to determine whether this local port is
the source of circuit trouble. The example in Figure 1-38 shows a facility loopback being performed on
an MXP/TXP/FC_MR port.
Figure 1-38 Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Complete the “Create the Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port”
procedure on page 1-91.
Create the Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
Step 1 Connect an optical test set to the port you are testing:
Note Refer to the manufacturer’s instructions for detailed information about connection and setup of
the optical test set.
a. If you just completed the “1.5.4 Perform a Terminal (Inward) Loopback on Intermediate-Node
MXP/TXP/FC_MR Ports” procedure on page 1-88, leave the optical test set hooked up to the
source-node port.
b. If you are starting the current procedure without the optical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. Both Tx and Rx connect to the same port.
Destination
ONS Node
MXP TXP
Source
ONS Node
Intermediate
ONS Node
Test Set
MXP TXP MXP TXP
115968