Cisco ONS 15454 SDH - Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port

1-64
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.4.2 Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port
Step 4 Complete the “Test the Ethernet Card” procedure on page 1-64.
Test the Ethernet Card
Step 1 Complete the “Physically Replace a Traffic Card” procedure on page 2-271 for the suspected bad card
and replace it with a known-good one.
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:
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 “1.4.2 Perform a Terminal (Inward) Loopback on a Source-Node Ethernet Port”
procedure on page 1-64.
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. Figure 1-29 shows terminal loopback on a G-Series port.