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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.4.4 Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port
Step 7 Complete the “1.4.4 Perform a Terminal (Inward) Loopback on an Intermediate-Node Ethernet Port”
procedure on page 1-71.
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 Figure 1-31, the
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
Caution Performing a loopback on an in-service circuit is service-affecting.
Complete the “Create a Terminal Loopback on an Intermediate-Node Ethernet Port” procedure on
page 1-71.
Create a Terminal Loopback on an Intermediate-Node Ethernet 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 “1.4.3 Perform a Facility (Line) Loopback on an Intermediate-Node
Ethernet Port” procedure on page 1-68, leave the optical test set hooked up to the source-node port.
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.
Destination
ONS Node
Ethernet EthernetXC
Source
ONS Node
Intermediate
ONS Node
Ethernet
Test Set
Ethernet XC Ethernet Ethernet XC
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