Encoding methods and Modulation schemes
25.P.1
Computers use digital signalling, digitals signals are represented by the base 2 numbering system “Binary”. Binary bits are shown as 1 or 0, where 1 means ON and 0 means OFF. In a network where digital devices exist, digital signalling will be used. Dependant upon the encoding method used, a high voltage on a communications medium can represent a logical 1 and a low voltage of can represent a logical 0. Different methods of encoding exist these are used for different types of communication between electrical devices. Distortion, noise, and cross talk on a cabling medium are factors that prevent the accuracy of transmitted data to be intact. For these reasons different encoding methods exist. An example is when 2 wires are used to transmit music data to a speaker
Digital signals don’t always have to be carried over to the receiving end by electricity, light can also be used for digital communication. Fibre Optics use......
Join Now or Login to view the rest of this paper.
Approximate Word Count: 6024
Approximate Pages: 24 (260 words per double-spaced page) |