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Channels

1

A communication channel or simply channel refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications and computer networking.

Telecommunication is the transmission of signs, signals, messages, writings, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic systems.

A computer network or data network is a telecommunications network which allows computers to exchange data.

A transmission medium is a material substance that can propagate energy waves.

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2

A channel is used to convey an information signal, for example a digital bit stream, from one or several senders to one or several receivers.

A sender was a circuit in a 20th-century electromechanical telephone exchange which sent telephone numbers and other information to another exchange.

A bitstream, also known as binary sequence, is a sequence of bits.

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3

A channel has a certain capacity for transmitting information, often measured by its bandwidth in Hz or its data rate in bits per second.

The second is the base unit of time in the International System of Units.

Data is a set of values of qualitative or quantitative variables.

4

Communicating data from one location to another requires some form of pathway or medium.

5

These pathways, called communication channels, use two types of media: cable and broadcast.

Broadcasting is the distribution of audio or video content or other messages to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum, in a one-to-many model.

A cable is two or more wires running side by side and bonded, twisted, or braided together to form a single assembly.

6

Cable or wire line media use physical wires of cables to transmit data and information.

7

Twisted-pair wire and coaxial cables are made of copper, and fiber-optic cable is made of glass.

8

In information theory, a channel refers to a theoretical channel model with certain error characteristics.

Information theory studies the quantification, storage, and communication of information.

9

In this more general view, a storage device is also a kind of channel, which can be sent to and received from.

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