Cisco ONS 15454 SDH - Perform a Terminal Loopback on a Destination-Node MXP;TXP;FC_MR Port

1-93
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.6 Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR Port
Caution Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the “2.10.2 Protection Switching,
Lock Initiation, and Clearing” section on page 2-260 for basic instructions. For detailed information,
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, “Maintain the Node.”
Step 2 Resend test traffic on the loopback circuit with a known-good card installed.
Step 3 If the test set indicates a good circuit, the problem was 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 Complete the “Physically Replace a Traffic Card” procedure on page 2-271 for the faulty card.
Step 5 Clear the facility (line) loopback on the port:
a. Click the Maintenance > Loopback tab.
b. Choose None from the Loopback Type column for the port being tested.
c. Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
d. Click Apply.
e. Click Yes in the confirmation dialog box.
Step 6 Complete the “1.5.6 Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR Port”
procedure on page 1-93.
1.5.6 Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR
Port
The terminal loopback at the destination-node port is the final local hardware error elimination in the
circuit troubleshooting process. If this test is completed successfully, you have verified that the circuit
is good up to the destination port. The example in Figure 1-39 shows a terminal loopback on an
intermediate-node destination MXP/TXP/FC_MR port.
Figure 1-39 Terminal Loopback on a Destination-Node MXP/TXP/FC_MR port
Caution Performing a loopback on an in-service circuit is service-affecting.
Destination
ONS Node
TXP
Source
ONS Node
Intermediate
ONS Node
Test Set
MXP TXP MXP TXP MXP
116000