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Time division multiple
access (TDMA) is digital transmission
technology that allows a number of users to
access a single radio-frequency (RF) channel
without interference by allocating unique time
slots to each user within each channel.
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.
The TDMA digital transmission scheme
multiplexes three signals over a single
channel. The current TDMA standard for
cellular divides a single channel into six
time slots, with each signal using two slots,
providing a 3 to 1 gain in capacity over
advanced mobile-phone service (AMPS). Each
caller is assigned a specific time slot for
transmission microwave transmission.
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