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This is accomplished by TDM multiplexing or time division. The transmission time is divided into small intervals. Each interval can be used by a different conversation. Furthermore, one conversation is performed at intervals of different frequencies, so that a call can not be associated to https://www.openstreetmap.org/user/johnnycooper one frequency.
Thus, if a frequency is affected by interference, a conversation using this frequency only observed problems belonging to recharge api said frequency intervals. This is called TDMA. In CDMA systems, access code division multiplexing, which is done is that each call uses a code that http://www.veoh.com/users/romanshaw differs from the others.
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