In Chapter 12, we introduced the concept of a communication channel. We noted that communication channels are fundamental to modern technology, whether we are discussing wired networks, wireless networks, a backbone of the Internet, cell phones, satellite television, or even your TV remote control. The discussion of channels in Chapter 12 presents features of the channel, introduces channel media and shows how communication channels and channel segments—or links—are interconnected to build networks. Chapter 14 extends the discussion by introducing the fundamental technology of communication channels.


You will recall that a communication channel consists of a NIC transmitter that places a signal from a sending node onto the channel and a receiver that transfers the signal from the channel to the NIC of the receiving node, a transmission signaling method, and a medium to carry the signal. This is, of course, equally true for any type of channel.


Signals are the means used to communicate data. A signal is carried on a communication channel as an electrical voltage, an electromagnetic radio wave, or a switched light. Data is represented by changes in the signal as a function of time. The signal may take on a continuous range of values, in which case it is known as an analog signal, or it can take on only discrete values, in which case it is known as a discrete signal. A binary discrete signal is usually called a digital signal. Read More About: mywikinews

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Analog Signaling

Although digital transmission is favored for most use these days, analog transmission methods are required for wireless media, such as radio and sound, for wireless networking, and for other forms of wireless data communication. Radio transmission methods include satellite, cellular phone, wireless networking, and microwave communications. Radio waves can also be converted to equivalent electrical signals and used with wire media and may be preferred when a mixture of digital and analog data is being transmitted through the cable. Visit The Site: mediafire

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Communication between loosely coupled computers consists of messages passed over a communication channel. A communication channel is characterized by the transmission medium; the signaling transmission method; the channel capacity or bandwidth; the direction(s) of message flow; and the noise, attenuation, and distortion factors. Realistically, a channel may be made up of several sub channels, each with its own characteristics. Visit The Site: f95zone

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