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1.4.5 Perform a Facility (Line) Loopback on a Destination-Node Ethernet Port
Test and Clear the Ethernet Facility (Line) Loopback Circuit
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Examine the traffic received by the test set. Look for errors or any other signal information that the test
Step 2
set is capable of indicating.
If the test set indicates a good circuit, no further testing is necessary with the facility loopback. Clear the
Step 3
facility (line) loopback from the port:
a.
b.
c.
d.
e.
Clear the facility (line) loopback circuit:
Step 4
a.
b.
c.
d.
Step 5
Complete the
Test the Ethernet Card
Complete the
Step 1
and replace it with a known-good one.
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
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.
Complete the
Step 4
Clear the facility (line) loopback on the port:
Step 5
a.
b.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-76
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.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
"Test the Ethernet Card" procedure on page
"Physically Replace a Traffic Card" procedure on page 2-271
"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.
Chapter 1
1-76.
for the suspected bad card
"2.10.2 Protection Switching,
for basic instructions. For detailed information,
for the faulty card.
General Troubleshooting
July 2005
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