1-84
Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 1 General Troubleshooting
1.5.6 Perform a Facility Loopback on a Destination-Node Ethernet Port
Step 5 Clear the terminal loopback on the port:
a. Double-click the source-node card with the terminal loopback.
b. Click the Maintenance > Loopback tabs.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (IS; OOS,DSBLD; OOS,MT) 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 “1.5.6 Perform a Facility Loopback on a Destination-Node Ethernet Port” procedure on
page 1-84.
1.5.6 Perform a Facility Loopback on a Destination-Node Ethernet Port
You perform a facility loopback test at the destination port to determine whether this local port is the
source of circuit trouble. The example in Figure 1-35 shows a facility loopback being performed on an
Ethernet port.
Figure 1-35 Facility Loopback on a Destination-Node Ethernet Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Note Facility loopbacks require on-site personnel.
Complete the “Create the Facility Loopback on a Destination-Node Ethernet Port” procedure on
page 1-85.
Destination
ONS Node
Ethernet Ethernet
XC
Source
ONS Node
Intermediate
ONS Node
Test Set
Ethenet
XC
Ethernet Ethernet
XC
Ethernet
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