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Digital broadcastingIn digital television

November 22, 2011

Digital broadcastingIn digital television and digital radio systems, several variable bit-rate data streams are multiplexed together to a fixed bitrate transport stream by means of statistical multiplexing. This makes it possible to transfer several video and audio channels simultaneously over the same frequency channel, together with various services.

Description of the multiplexer

November 22, 2011

In electronics, a multiplexer (or mux) is a device that selects one of several analog or digital input signals and forwards the selected input into a single line.A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output.Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth. A multiplexer is also called a data selector.

Cost savings for multiplexers

November 22, 2011

One use for multiplexers is cost savings by connecting a multiplexer and a demultiplexer (or demux) together over a single channel (by connecting the multiplexer's single output to the demultiplexer's single input). The image to the right demonstrates this. In this case, the cost of implementing separate channels for each data source is more expensive than the cost and inconvenience of providing the multiplexing/demultiplexing functions.

An Inverse Multiplexer

November 22, 2011

An inverse multiplexer (often abbreviated to inverse mux. or imux.) allows a data stream to be broken into multiple lower data rate communication links. An inverse multiplexer differs from a demultiplexer because the multiple output streams from the former stay inter-related, whereas those from the latter are unrelated. An inverse multiplexer is the opposite of a multiplexer which divides one high speed link into multiple low speed links.

Integrated Services Digital Network

November 22, 2011

Integrated Services Digital Network (ISDN) is a set of communications standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. It was first defined in 1988 in the CCITT red book.[1] Prior to ISDN, the telephone system was viewed as a way to transport voice, with some special services available for data.

The Centre for Interactive Research on Sustainability

November 21, 2011

The Centre for Interactive Research on Sustainability (CIRS) is one of only a handful of buildings worldwide that will provide "net positive” benefits to the environment. It reduces UBC’s carbon emissions, powers itself and a neighboring building with renewable and waste energy, and provides water for inhabitants with rainwater treated onsite.

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