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$12\mathrm{.}3\mathrm{.}2$ TDMA

In time$-$division multiple access $($TDMA$),$ the stations share the bandwidth of the channel in time.

Each station is allocated a time slot during which it can send data.

Each station transmits its data in its assigned time slot.

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$12\mathrm{.}3\mathrm{.}3$ CDMA

Code$-$division multiple access $($CDMA$)$ differs from FDMA in that only one channel occupies the entire bandwidth of the link.

It differs from TDMA in that all stations can send data simultaneously; there is no timesharing.

In CDMA, one channel carries all transmissions simultaneously.