Cisco ONS 15454 SDH - Test and Clear the Terminal Loopback Circuit

1-43
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.3.2 Perform a Terminal (Inward) Loopback on a Source-Node Optical Port
Step 3 Use CTC to set up the terminal (inward) loopback circuit on the port being tested:
a. In node view, click the Circuits tab and click Create.
b. In the Circuit Creation dialog box, choose the type and size, such as VC HO.
c. Click Next.
d. In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
STMN1toSTMN2.
e. Leave the Bidirectional check box checked. Leave the default value for State.
f. Click Next.
g. In the Circuit Creation source dialog box, select the same Node, Slot, Port, VC, and Tug where the
test set is connected.
h. Click Next.
i. In the Circuit Creation destination dialog box, use the same Node, Slot, Port, VC, and Tug used for
the source dialog box.
j. In the Circuit Creation circuit routing preferences dialog box, leave all defaults.
k. In the VC Optimization dialog box, leave all defaults.
l. Click Finish.
Step 4 Confirm that the newly created circuit appears on the Circuits tab list and is described in the Dir column
as a two-way circuit.
Note It is normal for the “LPBKTERMINAL (STM1E, STMN)” condition, page 2-175 to appear
during a loopback setup. The condition clears when you remove the loopback.
Step 5 Create the terminal (inward) loopback on the destination port being tested:
a. In node view, double-click the card that requires the loopback, such as the destination optical card
in the source node.
b. Click the Maintenance > Loopback > Port tabs.
c. Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row
appropriate for the desired port.
d. Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
row appropriate for the desired port.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 Complete the “Test and Clear the Terminal Loopback Circuit” procedure on page 1-43.
Test and Clear the Terminal Loopback Circuit
Step 1 If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2 Examine the test traffic being received by the test set. Look for errors or any other signal information
that the test set is capable of indicating.