What is a Modem, Computer & Networking Basics for Beginners, Computer Technology Course
A modem is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to decode the transmitted information. The goal is to produce a signal that can betransmitted easily and decoded to reproduce the original digital data. Modems can be used with any means of transmitting analog signals, from light-emitting diodes to radio. A common type of modem is one that turns the digital data of a computer into modulated electrical signal for transmission over telephone lines and demodulated by another modem at receiver side recover the digitaldata.Modems are generally classified by the maximum amount of data they can send in a given unit of time, usually expressed in bits per second (symbol bit(s), sometimes abbreviated "bps"), or bytes per second (symbol B(s)). Modems can also be classified by their symbol rate, measured in baud. The baud unit denotes symbols per second, or the number of times per second the modem sends a new signal.
For example, the International Telecommunication Union ITU V.21 standard used audio frequency-shift keying with two possible frequencies, corresponding to two distinct symbols, to carry 300 bits per second using 300 baud. By contrast, the original ITU V.22 standard, which could transmit and receive four distinct symbols, transmitted 1,200 bits by sending 600 symbols per second using phase-shift keying.Many modems are used to connect to the Internet through telephone service or cable television service. Slow telephone service is called dial-up. Faster telephone service is called DSL (Digital subscriber line) and is usually more than ten times faster.
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