Cellular/Digital Technology (Encyclopedia of Science)
Cellular technology is the use of wireless communication, most commonly associated with the mobile phone. The term cellular comes from the design of the system, which carries mobile phone calls from geographical service areas that are divided into smaller pockets, called cells. Each cell contains a base station that accepts and transfers the calls from mobile phones that are based in its cell. The cells are interconnected by a central controller, called the mobile telecommunications switching office (MTSO). The MTSO connects the cellular system to the conventional telephone network and it also records call information so users can be charged appropriately. In addition, the MTSO system enables the signal strength to be examined every few secondsutomatically by computernd then be switched to a stronger cell if necessary. The user does not notice the "handoff" from one cell to another.
Traditional cellular technology uses analog service. This type of service transmits calls in one continuous stream of information between the mobile phone and the base station on the same frequency. Analog technology modulates (varies) radio signals so they can carry information such as the human voice. The major drawback to using analog service is the limitation on the number of channels that can be used.
Digital technology, on the other hand, uses a simple binary code to represent any signal as...
(The entire section is 906 words.)
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