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Chapter 1
General Troubleshooting
d.
e.
f.
Complete the
Step 6
Port" procedure on page
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
an MXP/TXP/FC_MR port.
Figure 1-38
Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
Source
ONS Node
MXP
Test Set
Caution
Performing a loopback on an in-service circuit is service-affecting.
Complete the
procedure on page
Create the Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
Connect an optical test set to the port you are testing:
Step 1
Note
a.
b.
July 2005
Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the
Admin State column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
"1.5.5 Perform a Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR
1-91.
TXP
"Create the Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port"
1-91.
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the
"1.5.4 Perform a Terminal (Inward) Loopback on Intermediate-Node
MXP/TXP/FC_MR Ports" procedure on page
source-node port.
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.
1.5.5 Perform a Facility (Line) Loopback on a Destination-Node MXP/TXP/FC_MR Port
Figure 1-38
shows a facility loopback being performed on
Intermediate
ONS Node
MXP
TXP
1-88, leave the optical test set hooked up to the
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
Destination
ONS Node
MXP
TXP
1-91
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