Computer World. Матросова Т.А. - 24 стр.

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23
9. What does Chat allow people to do?
10. How can you pay for the Internet?
Exercise 3. Find a definition of the Internet.
Exercise 4. Sum up what you have learned about the Internet.
TEXT 2
Look through the text and define it’s theme. Translate the text orally.
Connecting to the Net depends on where you are. If you're a college student or
work at a company with its own Net connections, chances are you can gain access
simply by asking your organization's computing center or data-processing department
– they will then give you instructions on how to connect your already networked
computer to the Internet.
Otherwise, you'll need four things: a computer, telecommunications software, a
modem and a phone line to connect to the modem.
The phone line can be your existing voice line – just remember that if you have
any extensions, you (and everybody else in the house or office) won't be able to use
them for voice calls while connected to the Net.
A modem is a sort of translator between computers and the phone system. It's
needed because computers and the phone system process and transmit data, or
information, in two different, and incompatible ways. Computers «talk» digitally; that
is, they store and process information as a series of discrete numbers. The phone
network relies on analog signals, which on an oscilloscope would look like a series of
waves. When your computer is ready to transmit data to another computer over a
phone line, your modem converts the computer numbers into these waves (which
sound like a lot of screeching) – it «modulates» them. In turn, when information
waves come into your modem, it converts them into numbers your computer can
process, by «demodulating» them.
Increasingly, computers come with modems already installed. If yours didn't,
you'll have to decide what speed modem to get. Modem speeds are judged in «baud
rate» or bits per second. One baud means the modem can transfer roughly one bit per
second; the greater the baud rate, the more quickly a modem can send and receive
information. A letter or character is made up of eight bits.
You can now buy a 2,400-baud modem for well under $70 – and most now
come with the ability to handle fax messages as well. For $200 and up, you can buy a
modem that can transfer data at 9,600 baud (and often even faster, when using special
compression techniques). If you think you might be using the Net to transfer large
numbers of files, a faster modem is alw ays w orth the pric e. It w ill dramat ically
reduce the amount of time your modem or computer is tied up transferring files and,
if you are paying for Net access by the hour, save you quite a bit in online charges.
Like the computer to which it attaches, a modem is useless without software to
tell it how to work. Most modems today come with easy-to-install software. Try the

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