Array very large scale integration video on demand

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Unformatted text preview: ry Large Scale Integration Video-On-Demand Voice Over IP Very Small Aperture Terminals Videsh Sanchar Nigam Limited WTP WWW X.400 X.500 XDR XHTML TDCDMA TDM TDMA TQ UDP ULSI UNIVAC UPC URL UTP UVEPRO M VAN VCR VDT VGA VLSI VOD VOIP VSAT VSNL WDP WLAN WLL WML WORM WSP WYSIWYG WTLS XML Wireless Transaction Protocol Word Wide Web Electronic Mail Protocol Directory Server Protocol external Data Representation extensible HyperText Markup Language extensible Markup Language Chapter 1 Introduction The word "computer" comes from the word "compute" which means to calculate. So a computer is normally considered to be a calculating device that can perform arithmetic operations at enormous speed. In fact, the original objective for inventing the computer was to create a fast calculating machine. But more than 80% of the work done by computers today is of nonmathematical or non-numerical nature. Hence, to define a computer merely as calculating device is to ignore over 80% of its work. More accurately, a computer may be defined as a device that operates upon data. Data can be anything like bio-data of various applicants when the computer is used for recruiting personnel, or the marks obtained by various students in various subjects when the computer is used to prepare results, or the details (name, age, sex, etc.) of various passengers when the computer is employed for making airline or railway reservations, or numbers of different types in case of application of computers for scientific research problems, etc. Thus, data comes in various shapes and sizes depending upon the type of computer application. A computer can store, process, and retrieve data as and when desired. The fact that computers process data is so fundamental that many people have started calling it a data processor. The name data processor is more inclusive because modern computers not only compute in the usual sense but also perform other functions with the data that flow to and from them. For example, data processors may gather data from various incoming sources, merge (process of mixing or putting together) them all, sort (process of arranging in some sequence - ascending or descending) them in the desired order and finally print them in the desired for...
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This document was uploaded on 04/07/2014.

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