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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter7 Configuring APS
Configuring APS Group Attributes
Figure 7-7 shows a simple point-to-point configuration with splitter protection. The configured working
path carries the active signal, and the configured protection path carries the standby signal.
Figure7-7 Active and Standby Path Configuration Example
Figure 7-8 shows the behavior of unidirectional path switching when a loss of signal occurs. In the two
node example network, unidirectional path switching operates as follows:
•Node 2 sends the signal over both the active and standby paths.
•Node 1 receives both signals and selects the signal on the active path.
•Node 1 detects a loss of signal light on its active path and switches over to t he stand by pa th.
•Node 2 does not switch over and continues to receive its original active path.
Now the nodes are communicating along different paths.
Figure7-8 Unidirectional Path Switching Example
Node 1 Node 2
Node 2 active path
Node 2 standby path
transparent
4/0/0
transparent
4/0/0
wavepatch 4/0/0
wavepatch 4/0/1 wavepatch 4/0/1
wdm 0/0 wdm 0/0
wdm 0/1 wdm 0/1
Node 1 standby path
Node 1 active path
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wavepatch 4/0/0
Node 1 Node 2
Node 2 standby path
Node 2 active path transparent
4/0/0
wavepatch 4/0/0
wavepatch 4/0/1
wavepatch 4/0/0
wavepatch 4/0/1
wdm 0/0 wdm 0/0
wdm 0/1 wdm 0/1
Node 1 active path
Loss of signal
Switchover
transparent
4/0/0
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