3.4. Payload Mappings
So far, the multiplexing structure of SONET and SDH has been described in detail. To get useful work out of these different sized containers, a payload mapping is needed, that is, a systematic method for inserting and removing the payload from a SONET/SDH container. Although it is preferable to use standardized mappings for interoperability, a variety of proprietary mappings may exist for various purposes.
In this regard, one of the most important payloads carried over SONET/SDH is IP. Much of the bandwidth explosion that set the wheels in motion for this book came from the growth in IP services. Hence, our focus is mainly on IP in the rest of this chapter. Figure 3-5 shows different ways of mapping IP packets into SONET/SDH ...
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