Some services traffic engineering concepts of statistical multiplexing . ( Downstream traffic can also be oversubscribed, in the same way that any LAN can be oversubscribed.
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Switched data transport networks are different, as they offer new and different services based on features as statistical multiplexing and complex connectivity schemes ( any point to any point ).
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Statistical multiplexing allows the bandwidth to be divided arbitrarily among a variable number of channels ( while the number of channels and the channel data rate are fixed in TDM ).
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Packet switching features delivery of variable bit rate data streams, realized as sequences of packets, over a computer network which allocates transmission resources as needed using statistical multiplexing or dynamic bandwidth allocation techniques.
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Developments in statistical multiplexing, improved compression technology, and, in some cases, an acceptance of lower quality or lower resolution broadcasts, allowed gradual increases in the number of services carried on digital terrestrial television multiplexes.
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Static TDM and other circuit switching is carried out at the physical layer in the OSI model and TCP / IP model, while statistical multiplexing is carried out at the data link layer and above.
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Fair queuing is an example of a max-min fair packet scheduling algorithm for statistical multiplexing and best effort packet-switched networks, since it gives scheduling priority to users that have achieved lowest data rate since they became active.
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Using statistical multiplexing technology in the encoders and multiplexer, the system provides variable bit rate compression needed to provide full quality standard definition video across all of the channels with enough bandwidth for radio ( audio only ) services.
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DirecTV also intends to deploy a technology called statistical multiplexing, which will allow higher data-transmission speeds to be allocated for programming with more motion-- like sports-- and lower data speeds to be allocated for " talking head " news shows.
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In the 1990s, it performed a similar feat by providing its customers with an early version of Voice over IP, which did not use the VoIP protocols, but made it possible to transmit voice over IP networks using statistical multiplexing.
