Optical Networks - _Chapter 6 Client Layers of the Optical Layer_73

Optical Networks - _Chapter 6 Client Layers of the Optical Layer_73

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6 chapter Client Layers of the Optical Layer T his chapter describes several networks that use optical fiber as their underlying transmission mechanism. These networks can be thought of as client layers of the optical layer. As we saw in Chapter 1, the optical layer provides lightpaths to the client layers, where the lightpaths are the physical links between client layer network elements. All the client layers that we will study process the data in the electrical domain, performing functions such as fixed time division multiplexing or statistical time division multiplexing (packet switching). They aggregate and bring a variety of lower-speed voice, data, and private line services into the network. Each of these client networks is important in its own right and can operate over point-to-point fiber links as well as over a more sophisticated optical layer, using the lightpaths provided by the optical layer. The predominant client layers in backbone networks today are SONET/SDH, Ethernet, and the Optical Transport Network (OTN). These protocols would cor- respond to the physical layer in the OSI hierarchy (see Figure 1.6). SONET/SDH as part of the first generation of optical networks was the earliest to be deployed in backbone networks and has been very successful over the years. It is particularly
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This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

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Optical Networks - _Chapter 6 Client Layers of the Optical Layer_73

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