From Forum Nokia Wiki

TDMA is an acronym for Time Division Multiple Access.

TDMA is a technology for delivering digital wireless service using time-division multiplexing (TDM). TDMA works by dividing a radio frequency into time slots and then allocating slots to multiple calls. In this way, a single frequency can support multiple, simultaneous data channels. TDMA is used by the GSM digital cellular system. TDMA technology shares a communications channel among several users.

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TDMA

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