Transmission Protocol
When a data or video packet is sent to or from a residence, it is encapsulated in a transmission protocol. The selection of transmission protocol represents a networking challenge because competing approaches are available, each of which has advantages and disadvantages. Systems using different transmission protocols cannot interoperate directly. The current candidates are IP, MPEG, and ATM. With IP encapsulation, all packets are sent over the Access Network to the Home Network in IP packets. MPEG packets are encapsulated inside IP. The Home Network obtains the IP packets, determines that the contents are really MPEG, de-encapsulates the packets, and forwards the MPEG packets inside to the set-top decoder function.
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