Cisco ONS 15454 SDH - Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)

1-35
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.8 Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)
Step 1 Initiate an external switching command (side switch) on the cross-connect cards:
a. Determine the standby cross-connect card. On both the physical node and the CTC node view
window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED
is green.
b. In node view, select the Maintenance > Cross-Connect > Card tabs.
c. In the Cross-Connect Cards area, click Switch.
d. Click Yes in the Confirm Switch dialog box.
Note After the active cross-connect goes into standby mode, the original standby card becomes
active and its ACT/STBY LED turns green. The former active card becomes standby and its
ACT/STBY LED turns amber.
Step 2 Resend test traffic on the loopback circuit.
Step 3 If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective
card to Cisco through the RMA process. Log into the Cisco Technical Support Website at
http://www.cisco.com/techsupport for more information or log into
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco
TAC numbers for your country.
Step 4 Proceed to Step 5. If the circuit is not shown to be faulty and the card is not shown to be defective, you
are finished with testing.
Step 5 Complete the “Physically Replace an In-Service Cross-Connect Card” procedure on page 2-271 for the
defective cross-connect card and perform Step 6.
Step 6 If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that
was cleared by the side switch. Clear the XC loopback circuit:
a. Click the Circuits tab.
b. Choose the XC loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 7 If the problem is not resolved, go to the “1.2.8 Perform a Terminal (Inward) Loopback on a
Source-Node Electrical Port (East to West)” procedure on page 1-35.
1.2.8 Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port
(East to West)
The terminal (inward) loopback test is performed on the node source port in the circuit, such as a
source-node electrical port. You first create a bidirectional circuit that starts on the destination-node
electrical port and loops back on the source-node electrical port. Then you proceed with the terminal
loopback test. Completing a successful terminal loopback to a source-node port verifies that the circuit
is good to the source electrical port. Figure 1-14 shows an example of a terminal loopback on a source
electrical port.