Filter
Top Products
1-12
Cisco ONS 15327 Troubleshooting Guide, R3.4
April 2003
Chapter 1 General Troubleshooting
Identify Points of Failure on a DS-N Circuit Path
Figure 1-9 Terminal Loopback on a Destination XTC Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Procedure: Create the Terminal Loopback on a Destination XTC Port
Step 1 Connect an electrical test set to the port you are testing:
a. If you just completed the “Perform a Hairpin on a Source Node XTC Port” procedure on page 1-8,
leave the electrical test set hooked up to the DS-N port in the source node.
b. If you are starting the current procedure without the electrical test set hooked up to the MIC card,
use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the MIC
connectors for the port you are testing. The Tx and Rx connect to the same port.
c. Adjust the test set accordingly.
Step 2 Use CTC to set up the terminal loopback circuit on the port being tested:
a. Click the Circuits tab and click the Create button.
b. Give the circuit an easily identifiable name, such as DSNtoDSN.
c. Set circuit Type and Size to the normal preferences.
d. Leave the Bidirectional check box checked and click the Next button.
e. In the Circuit Source dialog box, fill in the source Node, card Slot, Port, and Type where the test
set is connected and click the Next button.
f. In the Circuit Destination dialog box, fill in the destination Node, card Slot, Port, and Type (the
DS-N port in the destination node) and click the Finish button.
Step 3 Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Note Loopbacks operate only on ports in the OOS_MT state.
Note It is normal for a LPBKTERMINAL condition to appear during a loopback setup. The condition
clears when you remove the loopback.
MIC OC-N MIC
DS-N
DS-N
Test Set A
Terminal loopbac
k
OC-N
XTC
XTC
ONS 15327
Source
ONS 15327
Destination
76190
OC-N