What is a Span (for SRP)?

This post briefly defines and describes the term: Span within a Shared-Ring Protection-Switching system.

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What is a Span within a Shared-Ring Protection-Switching System?

In short, a Span is the set of fiber-optic connections between two adjacent nodes within a Shared-Ring Protection-Switching system.

In another post, we defined a Shared-Ring Protection-Switching system as a protection-switching system that contains at least three (3) nodes.

We further stated that each node (within this Shared-Ring Protection-Switching system) is connected to two neighboring nodes.

A span is a set of fiber-optic media that exists between and connects any two neighboring nodes.

I illustrate a Shared-Ring Protection-Switching system, with the Span (between Nodes B and C) highlighted below in Figure 1.

Span between Nodes B and C

Figure 1, Illustration of a 4-Fibre/4-Lambda Shared-Ring Protection-Switching system, with the Span (between Nodes B and C) highlighted.  

What kind of Signals does a Span Transport?

In most Shared-Ring Protection-Switching systems, a span will consist of two or four fibers transporting the following optical signals.

  • Clockwise Direction – Working Transport Entity
  • Clockwise Direction – Protection Transport Entity
  • Counter-Clockwise Direction – Working Transport Entity
  • Counter-Clockwise Direction – Protection Transport Entity

Can a System-Designer implement any sort of Protection-Switching across a Span?

Yes, with a 4-Fibre/4-Lambda Shared-Ring Protection-Switching system, the user can implement Span-Switching as a form of Protection-Switching.

Please see the post on Span-Switching for more information on this topic.

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Author: Darrell Smith

Darrell Smith has more than 30 years of experience as an Electrical Engineer. He has about 20 years of experience as an Applications Engineer and the remainder of his time was spent in Hardware Design and Product Marketing. He will now be sharing his wealth of knowledge on this blog.

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