(a)Distinguish between ‘Analog’ and ‘Digital’ forms of communication.
(b)Explain briefly two commonly used applications of the ‘Internet’.
(a)Distinguish between ‘Analog’ and ‘Digital’ forms of communication.
(b)Explain briefly two commonly used applications of the ‘Internet’.
Analog form of communicationDigital form of communicationIt makes use of analog signals whose amplitude varies continuously with time.It makes use of digital signals whose amplitude is of two levels, either low or highThe retrieved message in analog communication is not an exact copy of the original message. This is because the message suffers distortions over the medium and during its detection process and is distorted.The retrieved message in digital communication is always the exact copy of the original message and is practically free of distortionIt can broadcast only limited number of channels simultaneouslyIt can broadcast tremendously large number of channels simultaneously.
(b) Applications of the Internet:
1. E-mail: It allows the exchange of text or graphic material. One can write a letter and send it to the other person (recipient) through an internet service provider (ISP). The ISP works like the dispatching and receiving post office. 2. File transfer: A program known as the file transfer program (FTP) allows the transfer of files or software from one computer to the other computer connected to the Internet
Analog form of communicationDigital form of communicationIt makes use of analog signals whose amplitude varies continuously with time.It makes use of digital signals whose amplitude is of two levels, either low or highThe retrieved message in analog communication is not an exact copy of the original message. This is because the message suffers distortions over the medium and during its detection process and is distorted.The retrieved message in digital communication is always the exact copy of the original message and is practically free of distortionIt can broadcast only limited number of channels simultaneouslyIt can broadcast tremendously large number of channels simultaneously.
(b) Applications of the Internet:
1. E-mail: It allows the exchange of text or graphic material. One can write a letter and send it to the other person (recipient) through an internet service provider (ISP). The ISP works like the dispatching and receiving post office. 2. File transfer: A program known as the file transfer program (FTP) allows the transfer of files or software from one computer to the other computer connected to the Internet
