Cisco ONS 15454 SDH - Perform a Terminal (Inward) Loopback on a Source-Node MXP;TXP;FC_MR Port

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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Step 6 Complete the “1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR
Port” procedure on page 1-84.
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. Figure 1-35 shows an example of a terminal loopback on a source MXP/TXP/FC_MR
port.
Figure 1-35 Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Caution Performing a loopback on an in-service circuit is service-affecting.
Complete the “Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port”
procedure on page 1-84.
Create the Terminal (Inward) Loopback on a Source-Node MXP/TXP/FC_MR Port
Step 1 Connect an optical test set to the port you are testing:
Note Refer to the manufacturer’s instructions for detailed information about connection and setup of
the optical test set.
a. 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 1-81, leave the optical test set hooked up to the MXP/
TXP/FC_MR port in the source node.
b. 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.
Step 2 Adjust the test set accordingly.
Step 3 In node view, double-click the card that requires the loopback, such as the destination STM-N card in
the source node.
Destination
ONS Node
MXP TXPXC
Source
ONS Node
Intermediate
ONS Node
MXP TXPXCTXP
Test Set
MXP XC
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