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1.4.2 Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port
Complete the
Step 4
Test the Ethernet Card
Step 1
Complete the
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."
Step 2
Resend test traffic on the loopback circuit with a known-good card installed.
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:
Step 5
a.
b.
c.
d.
e.
Complete the
Step 6
procedure on page
1.4.2 Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port
The terminal (inward) loopback test is performed on the node source Ethernet port. For the circuit in this
example, it is the source G1000 port in the source node. You first create a bidirectional circuit that starts
on the node destination G1000 port and loops back on the node source G1000 port.You then proceed
with the terminal loopback test. Completing a successful terminal loopback to a node source port verifies
that the circuit is good to the source port.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-64
"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.
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.
"1.4.2 Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port"
1-64.
1-64.
for basic instructions. For detailed information,
Figure 1-29
shows terminal loopback on a G-Series port.
Chapter 1
General Troubleshooting
for the suspected bad card
"2.10.2 Protection Switching,
for the faulty card.
July 2005
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