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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.3 Perform a Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR Port
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 defective card.
Step 5 Clear the terminal loopback on the port before testing the next segment of the network circuit path:
a. Double-click the card in the source node with the terminal loopback.
b. Click the Maintenance > Loopback tab.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the
Admin State column for the port being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 6 Complete the “1.5.3 Perform a Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR
Port” procedure on page 1-86.
1.5.3 Perform a Facility (Line) Loopback on an Intermediate-Node
MXP/TXP/FC_MR Port
Performing the facility (line) loopback test on an intermediate port isolates whether this node is causing
circuit failure. In the situation shown in Figure 1-36, the test is being performed on an intermediate
MXP/TXP/FC_MR port.
Figure 1-36 Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Complete the “Create a Facility (Line) Loopback on an Intermediate-Node MXP/TXP/FC_MR Port”
procedure on page 1-87.
Destination
ONS Node
MXP TXPXC
Source
ONS Node
Intermediate
ONS Node
MXP TXPXC
Test Set
MXP XC TXP
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