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Optical Network Control: Architecture, Protocols, and Standards by Debanjan Saha, Bala Rajagopalan, Greg Bernstein

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4.3. Ring-Based Protection

4.3.1. Introduction/Background

Ring-based protection has been part of the transport network landscape for some time due to the wide deployment of ring network topologies. More recently, interest has arisen in ring-based protection independent of the underlying network topology. In this chapter, the theoretical underpinnings of ring-based protection are reviewed and a wide range of ring implementations and applications are studied. This includes access rings, shared protection transport rings, a variant of the shared protection ring suitable for transoceanic cable use, software defined rings, and a new ringlike protection mechanism known as p-cycles.

4.3.2. Theoretical Background on Rings

Suppose that there are a number ...

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