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GSM is a digital standard which is internally based on Time Division Multiple Access (TDMA) techniques. Newer GSM phones also support digital transmission through GPRS, which allows packets of data to be sent and received at moderate rates. It is this GPRS extension which allows new features such as MMS and WAP/web browsing capability.
Mobile
TDMA is an acronym which stands for "Time Division Multiple Access". It is a digital standard which allows for each cellular "channel" to be divided into time slots, thus providing a gain in capacity over AMPS. Given the higher capacity per cell tower and the fact that it is a digital standard, TDMA was the obvious follow-on replacement to AMPS.
Currently TDMA is highly used in the US and a few other parts of the world, but its use is quickly being phased out in favor of GSM and CDMA.
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