Data Compression White Papers
Modems
Overview A modem is a signal converter. It transforms digital-to-analog, analog-to-digital signals in order to enable communication between two computers through a telephone line. Data within a computer is stored in digital format: the signals it uses to manipulate information occur in only two distinct states: on and off. Therefore a computer can communicate directly only with devices that are also digital in nature. The reason why modems were invented was to take advantage of the large telephone communications network already installed. A modem receives a digital signal from a PC and converts it, or modulates it, to an analog signal. Pulses (bits) are then transformed into sounds. Tones are sent over telephone lines in much the same way that voice travels over them. At the other end, another modem receives the analog signal and reconverts it—or demodulates it— back to digital form.
| Publisher | Acer America Corporation | File Format | PDF, requires Acrobat Rdr 5 |
|---|---|---|---|
| Date Published | January 2004 | Downloads | 9 |
| Format | White Papers | ||
| Topics | |||
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