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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.3.6 Perform a Facility (Line) Loopback on a Destination-Node Optical Port
b. Click the Maintenance > Loopback > Port tabs.
c. Select None from the Loopback Type column for the port being tested.
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 Clear the terminal loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 7 Complete the “1.3.6 Perform a Facility (Line) Loopback on a Destination-Node Optical Port” procedure
on page 1-55.
1.3.6 Perform a Facility (Line) Loopback on a Destination-Node Optical 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 1-26 shows a facility loopback being performed on
an STM-N port.
Figure 1-26 Facility Loopback Path to a Destination-Node STM-N Port
Caution Performing a loopback on an Unlocked circuit is service-affecting.
Complete the “Create the Facility (Line) Loopback on a Destination-Node Optical Port” procedure on
page 1-56.
Destination
ONS Node
STM-N STM-NXC
Source
ONS Node
Intermediate
ONS Node
Test Set
STM-N XC STM-N STM-N XC STM-N
90590
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