1-7
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.2.1 Perform a Facility Loopback or Payload Loopback on a Source-Node Optical Port
series of facility, cross-connect, and terminal loopbacks, the example scenario traces the circuit path,
tests the possible failure points, and eliminates them. The logical progression contains seven network
test procedures:
Note
The test sequence for your circuits will differ according to the type of circuit and network topology.
1.
A facility (or payload) loopback on the source-node STM-N port
2.
A terminal loopback on the source-node STM-N port
3.
A cross-connect loopback on the source STM-N port
4.
A facility (or payload) loopback on the intermediate-node STM-N port
5.
A terminal loopback on the intermediate-node STM-N port
6.
A facility (or payload) loopback on the destination-node STM-N port
7.
A terminal loopback on the destination-node STM-N port
Note
Facility and terminal loopback tests require on-site personnel.
1.2.1 Perform a Facility Loopback or Payload Loopback on a Source-Node
Optical Port
The STM-16 card or ASAP card optical port facility loopback test is performed on the node source port
in the network circuit. Likewise for the STM-64 payload loopback. In the testing situation used in this
example, the source optical port in the source node. Completing a successful facility loopback on this
port isolates the optical port as a possible failure point.
shows an example of a facility
loopback on a circuit source STM-N port.
Figure 1-6
Facility Loopback on a Circuit Source STM-N Port
Caution
Performing a loopback on an in-service circuit is service-affecting.
Note
Facility and payload loopbacks require on-site personnel.
Complete the
“Create the Facility Loopback or Payload Loopback on the Source Optical Port” procedure
.
Destination
ONS Node
STM-N
STM-N
XC
Source
ONS Node
Intermediate
ONS Node
STM-N
STM-N
XC
STM-N
Test Set
XC
STM-N
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Содержание Cisco ONS 15600 SDH
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