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| A modem is a device used to connect to other PCs over
standard telephone lines to exchange files, to chat with other users, to send electronic
mail massages, or to surf the Internet. The sending computer’s modem modulates the
computer’s digital signals into analog signals that pass over the phone lines. Then
the receiving computer ‘s modem demodulates the analog signal back into the digital
signal that the computer understands. The sending computer used the modem to essentially
call the second computer. Since the number of Internet users and web site increase the
modem has become the important part of a computer. "In recent years, the 2400 bits per second (called 2.4Kbps) modem that could carry e-mail has become obsolete. 14.4 Kbps (14400) and 28.8 Kbps (28800) modems were temporary landing places on the way to the much higher bandwidth devices and carriers of tomorrow. From early 1998, most new personal computers came with 56 Kbps (56000) modems. By comparison, using a digital Integrated Services Digital Network adapter instead of a conventional modem, the same telephone wire can now carry up to 128 Kbps. With Digital Subscriber Line (Digital Subscriber Line) systems, now being deployed in a number of communities, bandwidth on twisted-pair can be in the megabit range." When two modems communicate, they must first agree on a communication speed. A modem speed is expressed in terms of baud rate – bits per second. A 14400 (14.4K) can send and receive 14400 bits of information in a second. The larger the number bits per second a modem has the faster it can send and receive the data. |
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