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Data Communication and networks
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Assignment Task 1 Networks use encoding to make sure the information on the network is safe, here are two: - TDM (Time Division Multiplexing) which cuts a small chunk off each data stream and sends the chunks one by one, then the computer at the other end puts it all together again. Amplitude encoding is where both ends of the data stream decide on amplitude to send their information. Multi-carrier modulation (MCM) is a method of transmitting data by splitting it into several components, and sending each of these components on separate carrier signals. The individual carriers have narrow bandwidth, but the composite signal can have a large bandwidth. Task 2 Infra-Red – This medium uses infra-red pulses to communicate. The disadvantage is that the receiver and transmitter have to be perfectly aligned with no obstructions, which is unpractical with busy offices. Infra-Red is also relatively hard to eves drop on because to eves drop you would have to directly in the line of sight of the transmitter and receiver. Due to the unreliability of this medium most companies opt for a different option. Infra-Red can reach speeds of up to 16 mbps. Radio – This technology has been used for communication for years and can be used for many purposes. Radio has mainly been used for radio broadcasts, which it is ideally suited, but for computer communication it has its limitations. For example radio LAN networks are easy to eves drop, and the company’s information is not always safe. The advantages of radio communication are that it is quite cheap and cable free.
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