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1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Complete the
Step 6
Port" procedure on page
1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node
MXP/TXP/FC_MR Port
The terminal (inward) loopback test is performed on the node source MXP/TXP/FC_MR muxponder or
transponder port. For the circuit in this example, it is the source MXP/TXP/FC_MR port in the source
node. Completing a successful terminal loopback to a node source port verifies that the circuit is good
to the source port.
port.
Figure 1-35
Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Source
ONS Node
MXP
Test Set
Performing a loopback on an in-service circuit is service-affecting.
Caution
Complete the
procedure on page
Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Connect an optical test set to the port you are testing:
Step 1
Note
a.
b.
Adjust the test set accordingly.
Step 2
In node view, double-click the card that requires the loopback, such as the destination STM-N card in
Step 3
the source node.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-84
"1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR
1-84.
Figure 1-35
XC
TXP
"Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port"
1-84.
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the
"1.5.1 Perform a Facility (Line) Loopback on a Source-Node
MXP/TXP/FC_MR Port" procedure on page
TXP/FC_MR port in the source node.
If you are starting the current procedure without the optical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. Both Tx and Rx connect to the same port.
shows an example of a terminal loopback on a source MXP/TXP/FC_MR
Intermediate
ONS Node
MXP
XC
TXP
1-81, leave the optical test set hooked up to the MXP/
Chapter 1
General Troubleshooting
Destination
ONS Node
MXP
XC
TXP
July 2005
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