Evolution of Mobile Communication (Itnoyon)

First Generation
The 1st commercial automated cellular network was launched by NTT in Japan in 1979, followed by the launch of Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden, in 1981.

Year – 1970 - 1980s

Standard - AMPS (Advanced Mobile Phone System).

Services – Only Voice

Technology – Analog

Speed - 1kbps to 2.4 kbps

Multiplexing – FDMA

Switching – circuit switching

Core Network – PSTN only

Frequency – 800- 900 MHz

RF Bandwidth - 30 kHz. The band can accommodate 832 duplex channels, among which 21 are reserved for call setup, and the rest for voice communication