1-10
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.2.2 Perform a Terminal Loopback on a Source-Node Optical Port
Step 7
Complete the
“1.2.2 Perform a Terminal Loopback on a Source-Node Optical Port” procedure on
1.2.2 Perform a Terminal Loopback on a Source-Node Optical Port
The terminal loopback test is only available on ASAP card optical and Ethernet ports. (This section will
only address the optical ports; Ethernet ports are covered in
1.3 Troubleshooting an Ethernet Circuit
Path With Loopbacks, page 1-29
.) Terminal loopbacks are not available on STM-16 or STM-64 cards.
To create a terminal loopback, create a bidirectional circuit originating on the node source optical port
and looping back on the node source optical port. You then proceed with the terminal loopback test.
Completing a successful terminal loopback to a node source port verifies that the circuit is good to the
source port.
shows an example of a terminal loopback on a source optical port.
Figure 1-7
Terminal Loopback on a Source-Node STM-N Port
Caution
Performing a loopback on an in-service circuit is service-affecting.
Note
Terminal loopbacks require on-site personnel.
Complete the
“Create the Terminal Loopback on a Source-Node Optical Port” procedure on page 1-10
Create the Terminal Loopback on a Source-Node Optical Port
Step 1
Connect an optical test set to the ASAP card optical port you are testing:
Note
For specific procedures to use the test set equipment, consult the manufacturer.
a.
If you just completed the
“1.2.1 Perform a Facility Loopback or Payload Loopback on a
Source-Node Optical Port” procedure on page 1-7
for an optical port, leave the optical test set
hooked up.
b.
If you are starting the current procedure without the optical test set hooked up to the source optical
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.
c.
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Destination
ONS Node
STM-N
STM-N
XC
Source
ONS Node
Intermediate
ONS Node
STM-N
STM-N
XC
STM-N
Test Set
STM-N
XC
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Содержание Cisco ONS 15600 SDH
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