Cisco ONS 15454 Troubleshooting Manual page 125

Chapter 1 General Troubleshooting
b.
c.
d.
e.
Clear the facility loopback circuit:
Step 6
a.
b.
c.
d.
Complete the
Step 7
page
1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports
In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate
whether the destination port is causing circuit trouble. In the example situation in
terminal loopback is performed on an intermediate Ethernet port in the circuit. You first create a
bidirectional circuit that originates on the source-node Ethernet port and loops back on the
intermediate-node port. You then proceed with the terminal loopback test. If you successfully complete
a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.
Figure 1-34 Terminal Loopback on an Intermediate-Node Ethernet Port
Source
ONS Node
Ethernet
Test Set
Performing a loopback on an in-service circuit is service-affecting.
Caution
Note Terminal loopbacks require on-site personnel.
Complete the
page
November 2009
Choose None from the Loopback Type column for the port being tested.
Choose the appropriate state (IS; OOS,DSBLD; OOS,MT) from the Admin State column for the port
being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
"1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports" procedure on
1-81.
XC Ethernet
"Create a Terminal Loopback on Intermediate-Node Ethernet Ports" procedure on
1-82.
1.5.5 Create a Terminal Loopback on Intermediate-Node Ethernet Ports
Intermediate
ONS Node
Ethernet XC Ethernet
Cisco ONS 15454 Troubleshooting Guide, R8.5
Figure 1-34, the
Destination
ONS Node
Ethernet XC Ethernet
1-81