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1.2.8 Perform a Terminal (Inward) Loopback on a Source-Node Electrical Port (East to West)
Figure 1-18
Terminal (Inward) Loopback on a Source Electrical Port
Source
ONS Node
STM-N
Test Set
Performing a loopback on an Unlocked circuit is service-affecting. To protect traffic, apply a lockout or
Caution
Force switch to the target loopback port. See the
Clearing" section on page 2-260
refer to the Cisco ONS 15454 SDH Procedure Guide Chapter 15, "Maintain the Node."
Electrical circuit terminal loopbacks do not transmit an AIS condition in the direction away from the
Note
loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.
Complete the
page
Create the Terminal (Inward) Loopback on a Source-Node Electrical Port
Connect an electrical test set to the port you are testing:
Step 1
a.
b.
Step 2
Adjust the test set accordingly.
In CTC node view, click the Circuits tab and click Create.
Step 3
In the Circuit Creation dialog box, choose the type and size, such as VC HO Path Circuit, and the
Step 4
number, such as 1.
Click Next.
Step 5
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as ENtoEN.
Step 6
Leave the Bidirectional check box checked.
Step 7
Click Next.
Step 8
In the Circuit Creation source dialog box, select the Node, Slot, Port, and VC4 where the test set is
Step 9
connected.
Click Next.
Step 10
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-36
XC
STM-N
"Create the Terminal (Inward) Loopback on a Source-Node Electrical Port" procedure on
1-36.
If you just completed the
"1.2.7 Perform an XC Loopback on a Source-Node STM-N VC (East to
West) Carrying an Electrical Circuit" procedure on page
to the electrical port in the source node.
If you are starting the current procedure without the electrical test set hooked up to the electrical
port, use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the
electrical panel or the FMEC connectors for the port you are testing. Both Tx and Rx connect to the
same port.
Intermediate
ONS Node
STM-N
XC
STM-N
"2.10.2 Protection Switching, Lock Initiation, and
for basic instructions. For more information about these operations,
Chapter 1
General Troubleshooting
Destination
ONS Node
STM-N
XC
1-32, leave the electrical test set hooked up
STM-N
July 2005
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