Telecommunications and internet

This term refers to the transmission of information over long distances using the telephone system, radio, TV satellite or computer links. Examples are two people speaking on the phone, a sales department sending a fax to a client or someone reading the teletext pages on TV But in the modern world, telecommunications mainly means transferring information from one PC to another via modem and phone lines (or fibre-optic cables).
A modem is your computer’s link to the external world. With a modem you can exchange e-mail and files with friends and colleagues; you can access the Web and search for information about the stock market, current affairs, entertainment, etc..; you can participate in newsgroups and live conversations; you can make bank transactions and buy things from the comfort of your home. You can also access your office from your computer at home or your laptop in a hotel room.
Your PC is a digital device (it works with strings of 1s and 0s). However, the telephone system is an analogue device, designed to transmit the sounds and tones of the human voice. That’s why we need a modem – a bridge between digital and analogue signals. The word ‘modem’ is an abbreviation of MOdulator/DEModulator. When a modem modulates, it sends very rapid on/off pulses. The computer on the other end translates (demodulates) those signals into intelligible text or graphics. Modem transmission speeds are measured in kilobits per second. Typical speeds on 28.8, 33.6 and 56 kbps.
Today a lot of companies find it more efficient to have some employees doing their work at home. Using a modem, they transfer their work into the office where it is printed and distributed. The list of applications is endless.
You just need a PC (or a terminal), a modem 30 connected to the computer and the telephone...

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