How many types of mobile telephone systems are there?
The mainstream mobile telephone systems in the last twenty five years have been: YearMobile Telephone System 1981Nordic Mobile Telephone (NMT) 1983American Mobile Phone System (AMPS) 1985Total Access Communication Systems (TACS) 1986Nordic Mobile Telephony (NMT) 1991American Digital Cellular (ADC) 1991Global System for Mobile Communication (GSM) 1992Digital Cellular System (DCS) 1800 1994Personal Digital Cellular (PDC) 1995Personal Communications Service (PCS) 1900 – Canada 1996Personal Communications Service (PCS) – USA Mobile telephone systems are either analog or they are digital. In analog systems, voice messages are transmitted as sound waves. When you speak into an analog mobile telephone, your voice wave is linked to a radio wave and transmitted. In digital systems, voice messages are transmitted as a stream of zeroes and ones. When you speak into a digital mobile telephone, your voice wave is converted into a binary pattern before being transmitted. Mobile telephone system all
