Perform A Terminal Loopback On A Source-Node Ethernet Port; Create The Terminal Loopback On A Source-Node Ethernet Port - Cisco ONS 15600 SDH Troubleshooting Manual

1.3.2 Perform a Terminal Loopback on a Source-Node Ethernet Port

e.
Complete the
Step 9
page
1.3.2 Perform a Terminal Loopback on a Source-Node Ethernet Port
The terminal loopback test is performed on the node source Ethernet port. For the circuit in this example,
it is the source Ethernet port in the source node. You first create a bidirectional circuit that starts on the
node destination Ethernet port and loops back on the node source Ethernet port.You then proceed with
the terminal loopback test. Completing a successful terminal loopback to a node source port verifies that
the circuit is good to the source port.
Performing a loopback on an in-service circuit is service-affecting.
Caution
Terminal loopbacks require on-site personnel.
Note
Complete the

Create the Terminal Loopback on a Source-Node Ethernet Port

Step 1 Connect an optical test set to the ASAP card Ethernet port you are testing:
Note
a.
b.
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 2
Use CTC to set up the terminal loopback on the test port:
Step 3
a.
b.
c.
d.
e.
f.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
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Click Yes in the confirmation dialog box.
"1.3.2 Perform a Terminal Loopback on a Source-Node Ethernet Port" procedure on
1-32.
"Create the Terminal Loopback on a Source-Node Ethernet Port" procedure on page
For specific procedures to use the test set equipment, consult the manufacturer.
If you just completed the "1.3.1 Perform a Facility Loopback on a Source-Node Ethernet Port"
procedure on page 1-29, leave the optical test set hooked up to the Ethernet port in the source node.
If you are starting the current procedure without the optical test set hooked up to the source Ethernet
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.
In node view, click the Circuits tab and click Create.
In the Circuit Creation dialog box, choose the type, such as VC_HO_PATH_CIRCUIT, and number
of circuits, such as 1.
Click Next.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
Eth1toEth2.
Leave the Bidirectional check box checked.
Click Next.
Chapter 1 General Troubleshooting
1-32.
July 2010