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

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8.1. Introduction

Protection and restoration are two methods whereby traffic affected by network failures is automatically rerouted over alternate resources. As per the definitions in Chapter 4, the term protection denotes the paradigm whereby a dedicated backup resource is used to recover the services provided by a failed resource. In contrast, the term restoration is used to denote the paradigm whereby backup resources are not dedicated to specific primary resources, but allocated dynamically based on availability. This may result in longer recovery times as compared with the protection case, but with possible improvements in network utilization.

Protection is a well-established feature in SONET/SDH networks. In Chapter 4, the details of Linear ...

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