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DWDM Network Designs and Engineering Solutions by Tony Antony, Ashwin Gumaste

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Chapter 7. X over DWDM

Traditionally, the open standards interface (OSI) model assumes seven layers of hierarchy for data communication. The WDM layer can be viewed as the bottom-most layer in this hierarchical model. This layer is quite transparent to data formats or protocols; it just transports simple raw bits. Layers 2, 3, and 4 perform the function of data link control, network layer, and transport layer, respectively. They guide communication sessions between two or more points in a network.

More than 1600 protocols exist in today's Internet that facilitate the transport of datagrams and voice circuits across the network. In this chapter, we shall briefly view some of the protocols over WDM as they facilitate transport of information through ...

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