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Digital AMPS (D-AMPS) is second-generation (2G) cellular technology meant as a further development over the North-American first generation system called AMPS (Advanced Mobile Phone Service). D-AMPS was widely used in the USA and Canada ever since the first commercial cellular network was first deployed in 1993. D-AMPS technology has been retired and largely replaced by GSM/GPRS and CDMA2000 cellular technologies.
Digital AMPS, IS-54 and IS-136 standards, uses time division multiple access channel access method and is usually referred to as a TDMA System or simply TDMA rather than the more appropriate D-AMPS. D-AMPS uses existing AMPS technology to safely and easily transition from analog to digital systems in the same area, allowing for a quick upgrade from AMPS, the original analog standard system for cellular communication in the US and Canada.
D-AMPS is the digital version of AMPS and provides TDMA (time division multiple access) to AMPS in order to get three channels for every single AMPS channel, therefore tripling the number of calls possible in a single channel, which obviously triples throughput.