A modem is a device used to convert the signal because the signal on your computer as a digital signal (Digital) audio signal analog phone systems. (Analog), so when they want to log on to the Internet to use as a modem device for converting digital signals into analogue signals from a computer by phone line, and the analog signal into a digital signal, converts it from. When you reach the destination modem speed is a bit per second. (Bit per second: bps) means that in one second, there will be information sent or received, how many bits, such as a 56 Kpbs modem speed is 56 Kbps data-bits in one second, the modem can be divided into three categories, namely.
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