Information Technology (IT) has been making positive and crucial impacts in the day-to-day lives of the people for the last 35 years or so in India, and for a little longer time elsewhere in Western Europe and North America. The banking, finance, insurance, stock and commodities trading, education, health-care and mass communication sectors, to name a few, have taken rapid [...]
Everything you need to know about computer ! Q. 1. What do you mean by computer? Ans. Computer refers to an electronic device that can transmit, store and process information or data in a desired form. Q. 2. Define Bioinformatics. Ans. The computer aided study of biology particularly genetics and molecular biology is called bioinformatics. Now the science of bioinformatics [...]
In this article we will discuss about the five main functions of spreadsheet. The functions are: 1. Mathematical Functions 2. Financial Functions 3. Logical Functions 4. Special Functions 5. Statistical Functions 1. Mathematical Functions: A number of mathematical functions are available which uses numeric values as arguments. To use them, move the cell pointer to the required cell and type [...]
The following example is adapted from an example given by Hughes Escort. This example may help to explain TDM/TDMA (Time Division Multiplexing/Time Division Multiple Access )technology in a very simple way. It seems many of us are working backwards in this age of technology. It is amusing, but true to a large extent. Instead of explaining the new technologies in [...]
Wireless communications may require the use of different facilities at different times. These are: Radio transmission and Microwave transmission. We shall look at each of them separately. 1. Radio Transmission: Radio transmission is one of the ways that wireless transmission can take place; the other widely used method of wireless transmission usually is microwave transmission. All these methods of transmission [...]
This article throws light upon the top six methods of data transmission. The methods are: 1. Twisted Pair 2. Shielded Twisted Pair 3. Baseband Coaxial Cable 4. Broadband Coaxial Cable 5. Fibre Optics 6. IEEE Standards. Method # 1. Twisted Pair: As must be obvious from the example, transferring data by copying it onto magnetic tape or floppy disk or [...]
After reading this article you will learn about the role of multiplexing in telephone communication. Other issues that may be important in telephone communications are related to multiplexing. Since it costs the same amount to lay cables (whether copper or Fibre Optic) for narrowband transmission as it does for broadband transmission, it is natural that the telephone authorities try to [...]
Like all modern developments, the development of radio transmission has been a combined effort and like all modern developments, the name of one man is invariably associated with it as the "inventor" of radio transmission. Guglielmo Marconi is the one name that has been widely associated with the "radio" as its inventor although the theoretical work for wave transmission was [...]
A telegraph can be defined as any device or system that allows or facilitates the transmission of information by coded signals over some distance. The word telegraph is derived from the Greek words 'tele' meaning 'distant' and 'graphein' meaning 'to write'. It came into existence at the end of the 18th century to describe an optical semaphore system developed in [...]
After reading this article you will learn about: 1. Introduction to Maxwell's Theory on Transmission of Waves 2. Development of the Concepts of "Field" 3. The Contributions of Heinrich Hertz 4. Unified Theory of Electromagnetism 5. Maxwell's Equations 6. Electromagnetic Wave Propagation. Introduction to Maxwell's Theory on Transmission of Waves: We have, so far, discussed the development of devices that [...]