Usage
Examples of statistical multiplexing are:
- The MPEG transport stream for digital TV transmission. Statistical multiplexing is used to allow several video, audio and data streams of different data rates to be transmitted over a bandwidth-limited channel (see #Statistical multiplexer). The packets have constant lengths. The channel number is denoted Program ID (PID).
- The UDP and TCP protocols, where data streams from several application processes are multiplexed together. The packets may have varying lengths. The port numbers constitute channel identification numbers (and also address information).
- The X.25 and Frame relay packet-switching protocols, where the packets have varying lengths, and the channel number is denoted Virtual Connection Identifier (VCI). The international collection of X.25 providers, using the X.25 protocol suite was colloquially known as "the Packet switched network" in the 1980s and into the beginning of the 1990s.
- The Asynchronous Transfer Mode packet-switched protocol, where the packets have fixed length. The channel identification number consists of a Virtual Connection Identifier (VCI) and a Virtual Path Identifier (VPI).
Read more about this topic: Statistical Time Division Multiplexing
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