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What is Operating System?

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Hardware is nothing but finely  designed machinery. A machine is ultimately a machine only,which is always made to work. In case of computers, it is either us if we do that or some other which does it for us. This some other is nothing  but our very  own operating system.    Operating system is just like our secretary. As the boss gives orders to his secretary and the secretary does all work for his boss. The secretary himself decides: How to do? what to do ?;etc Same way we pass our orders/requests to operating system and operating system does it for us. Operating system itself decides: How to do?; What to do?;  When  to do ? The primary goal of an operating system is thus to make the computer system convenient to use and secondary goal is to use computer hardware in an efficient manner.      An operating system is an important component of a system which controls all other components  of  a computer of a computer sys...
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What is MAC Address?

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The Address for a devices as it is identified at the Media Access Control(MAC) layer in the network architecture. MAC address is usually stored in  ROM(READ ONLY MEMORY) on the network adapter card and is unique.
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Satellite Communication (Satellite Microwave)

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Radio wave can be classified by Frequency and wavelength. When the frequency  is higher than 3Ghz, it is named microwave . Satellite communication is special case of microwave relay system. Satellite communication use the synchronous satellite to relay the radio signal transmitted from ground station . In recently , the use of wireless communication has gained more popularity. Compare to the traditional fixed wire terrestrial networks, satellite and microwave communication network features the time saving, fast implementation   and abroad coverage characteristic. It provides voice,fax,data and video service as well as email,file transfer ,WWW internet application. When fixed wire terrestrial communication networks are crushed by a disaster, the satellite and microwave  system as a emergency backup  facility will be started.      In satellite communication the earth station consists of a satellite dish that functions as an antenna and communi...
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