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Chapter 1
General Troubleshooting
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
Caution
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing" section on page 2-260
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, "Maintain the Node."
Resend test traffic on the loopback circuit with a known-good card installed.
Step 2
If the test set indicates a good circuit, the problem was probably the defective card. Return the defective
Step 3
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.
Complete the
Step 4
Clear the facility (line) loopback on the port:
Step 5
a.
b.
c.
d.
e.
Step 6
Complete the
procedure on page
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
intermediate-node destination MXP/TXP/FC_MR port.
Figure 1-39
Terminal Loopback on a Destination-Node MXP/TXP/FC_MR port
Source
ONS Node
MXP
Test Set
Performing a loopback on an in-service circuit is service-affecting.
Caution
July 2005
"Physically Replace a Traffic Card" procedure on page 2-271
Click the Maintenance > Loopback tab.
Choose None from the Loopback Type column for the port being tested.
Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
"1.5.6 Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR Port"
1-93.
TXP
1.5.6 Perform a Terminal Loopback on a Destination-Node MXP/TXP/FC_MR Port
for basic instructions. For detailed information,
Figure 1-39
Intermediate
ONS Node
MXP
TXP
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
"2.10.2 Protection Switching,
for the faulty card.
shows a terminal loopback on an
Destination
ONS Node
MXP
TXP
1-93
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