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IS54 cellular system
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IS54 cellular system

communications
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Quick Summary

The IS54 cellular system is a telecommunications technology that utilizes a combination of time-division multiple access (TDMA) and frequency-division multiple access (FDMA). TDMA divides a communication channel into time slots, allowing multiple users to share the same frequency by transmitting in their designated time slots. The IS54 system interleaves three digital signals using TDMA within a single 30-kilohertz frequency slot, which is more efficient than older analog systems like AMPS. While buffering digital signals for TDMA introduces a slight delay, it is generally imperceptible during calls. This approach enhances spectral efficiency, enabling more users to communicate within a given geographic area.12

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2 Britannica Sources
  1. telecommunication - Time-division multiple access
  2. mobile telephone

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