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

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4.2. Linear Protection

4.2.1. Introduction to Linear Protection

Linear protection is the simplest and perhaps the fastest of all the protection mechanisms. Figure 4-2 illustrates linear protection. In this figure, N (≥ 1) primary (or working) lines and M (≥ 1) backup (or protection) lines are shown. This is sometimes referred to as linear M:N protection. The lines shown can be SONET lines, WDM optical links, SDH paths, and so on. Additionally, the equipment shown on either end of the working and protection lines are those that terminate these signals in some form. There may be other equipment between these line termination equipment, but their operation will be essentially transparent and they do not participate in the linear protection mechanism. ...

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