Analogue system history
1970’s Microprocessors were used in the implementation of
1971 The first public radio telephone network ARP in Finland
was opened (no automatic switching)
1981 NMT 450 (Nordic Mobile Telephone) network
started operation in Scandinavia
1983 AMPS (Advanced Mobile Phone Service) in the US
1985 TACS network in the UK
Analogue speech transmission
Frequency modulation (FM)