Вопрос № 911614 - Английский язык

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Telephone lines were designed to carry the human 1_______, not electronic data from a computer. Modems were invented to convert 2_______ computer signals into a form that allows them to travel over the 3_______ lines. Those are the scratchy sounds you hear from a modem’s speaker. A modem on the other end of the line can understand it and 4_______ the sounds back into digital information that the computer can understand. By the way, the word modem stands for MOdulator/DEModulator.

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Until the end of 1995, the conventional wisdom was that 28.8 Kbps was about the fastest 1_______ you could squeeze out of a regular copper telephone line. Today, you can buy a modem capable of a data 2_______ up to 56 Kbps. The key question for you is knowing what speed modems your Internet service provider (ISP) has. If your ISP has only 28.8 Kbps 3_______ on its end of the line, you could have the fastest modem in the world, and only be able to 4_______ at 28.8 Kbps. Before you invest in a 56 Kbps modem, make sure your ISP supports them.

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A modem’s speed is measured in bits per second (bps). A 14.4 modem 1_______ data at 14,400 bits per second. A 28.8 modem is twice as fast, sending and receiving 2_______ at a rate of up to 28,800 bits per second.
Many things can interfere with the speed of a file transfer. These can range from excessive line 3_______ on the telephone line, the speed of the web server from which you are downloading files, the number of other people trying to access the same file and the overall traffic on the 4_______.

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Until the end of 1995, the conventional wisdom was that 28.8 Kbps was about the fastest 1_______ you could squeeze out of a regular copper telephone line. Today, you can buy a modem capable of a data 2_______ up to 56 Kbps. The key question for you is knowing what speed modems your Internet service provider (ISP) has. If your ISP has only 28.8 Kbps 3_______ on its end of the line, you could have the fastest modem in the world, and only be able to 4_______ at 28.8 Kbps. Before you invest in a 56 Kbps modem, make sure your ISP supports them.

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What is optic-electronic scanner used for?
The purpose of the input hardware is to collect data and convert it into a form suitable for computer processing. The most common input device is a keyboard. It looks very much like a typewriter. The mouse is a hand held device connected to the computer by small cable. As the mouse is rolled across the mouse pad, the cursor moves across the screen. When the cursor reaches the desired location, the user usually pushes a button on the mouse once or twice to signal a menu selection or a command to the computer.
The light pen uses a light sensitive photoelectric cell to signal screen position to the computer. Another type of input hardware is optic-electronic scanner that is used to input graphics as well as typeset characters. Microphone and video camera can be also used to input data into the computer. Electronic cameras are becoming very popular among the consumers for their relatively low price and convenience.

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What is CD-ROM used for?
The purpose of storage hardware is to store computer instructions and data in a form that is relatively permanent and retrieve when needed for processing. Storage hardware serves the same basic functions as do office filing systems except that it stores data as electromagnetic signals. The most common ways of storing data are hard disk, floppy disk and CD-ROM.
Hard disk is a rigid disk coated with magnetic material, for storing programs and relatively large amounts of data.
Floppy disk (diskette) – thin, usually flexible plastic disk coated with magnetic material, for storing computer data and programs.
CD-ROM (compact disc read only memory) is a compact disc on which a large amount of digitized read-only data can be stored.