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Chapter 1
General Troubleshooting
Complete the
Step 7
procedure on page
1.4.4 Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet
Port
In the next troubleshooting test, you perform a terminal loopback on the intermediate-node port to isolate
whether the destination port is causing circuit trouble. In the example situation in
terminal loopback is performed on an intermediate Ethernet port in the circuit. You first create a
bidirectional circuit that originates on the source-node Ethernet port and loops back on the
intermediate-node port. You then proceed with the terminal loopback test. If you successfully complete
a terminal loopback on the node, this node is excluded from possible sources of circuit trouble.
Figure 1-31
Terminal Loopback on an Intermediate-Node Ethernet Port
Source
ONS Node
Ethernet
Test Set
Performing a loopback on an in-service circuit is service-affecting.
Caution
Complete the
page
Create a Terminal Loopback on an Intermediate-Node Ethernet Port
Step 1
Connect an optical test set to the port you are testing:
Note
a.
b.
Adjust the test set accordingly.
Step 2
July 2005
"1.4.4 Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port"
1-71.
XC
Ethernet
"Create a Terminal Loopback on an Intermediate-Node Ethernet Port" procedure on
1-71.
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the
"1.4.3 Perform a Facility (Line) Loopback on an Intermediate-Node
Ethernet Port" procedure on page
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.
1.4.4 Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port
Intermediate
ONS Node
Ethernet
XC
Ethernet
1-68, leave the optical test set hooked up to the source-node port.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
Figure
1-31, the
Destination
ONS Node
Ethernet
XC
Ethernet
1-71
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