Specifications

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Cisco ONS 15530 Planning Guide
OL-7708-01
Chapter 2 Protection Schemes and Network Topologies
Supported Topologies
The Cisco ONS 15530 implements path switching using a SONET-compliant APS channel protocol over
the OSC (optical supervisory channel) or the in-band management channel on the protection path.
Note Bidirectional path switching operates only on Cisco ONS 15530 networks that have the OSC or the
in-band management channel.
Figure 2-18 shows a protected hubbed ring configuration. The configured working path carries the active
signal, and the configured protection path carries the standby signal.
Figure 2-18 Active and Standby Path Configuration Example
Cisco ONS 15530
Cisco ONS 15530
Cisco ONS 15540
Active path
Standby path
Node 1
Node 2
Node 3
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