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TDMA

Time Division Multiple Access or TDMA is a technology for shared medium networks. It allows several users to share the same frequency by dividing it into different time slots. The users transmit in rapid succession, one after the other, each using their own timeslot. This allows multiple users to share the same transmission medium (e.g. radio frequency) whilst using only the part of its bandwidth they require. It is mainly used in the GSM, PDC, iDEN digital cellular standards,satellite systems, local area networks, physical security systems, and combat-net radio systems.
TDMA was first specified as a standard in EIA/TIA Interim Standard 54 (IS-54). IS-136, an evolved version of IS-54, is the United States standard for TDMA for both the cellular (850 MHz) and personal communications services (1.9 GHz) spectrums.
The name "TDMA" is also commonly used in America to refer to a specific second generation (2G) mobile phone standard, more properly referred to as IS-136 or D-AMPS, which uses the TDMA technique to timeshare the bandwidth of.

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