10-08-2011, 10:56 AM
[attachment=15119]
OVERLOOK ON PREDECESSOR
First Generation :-
Advanced Mobile Phone Service (AMPS)
US trials 1978; deployed in Japan (’79) & US (’83)
800 MHz band
Nordic Mobile Telephony (NMT)
Sweden, Norway, Demark & Finland
Launched 1981;
450 MHz; later at 900 MHz (NMT900)
Total Access Communications System (TACS)
British design; similar to AMPS; deployed 1985
Some TACS-900 systems still in use in Europe
Second Generation :-
Digital mobile phones, including those that use GSM, CDMA or TDMA networks, are the second generation phones.
2.5 G & More:-
General Packet Radio Service (GPRS)
Enhanced Data Rates for Global Evolution (EDGE)
OVERLOOK ON PREDECESSOR
First Generation :-
Advanced Mobile Phone Service (AMPS)
US trials 1978; deployed in Japan (’79) & US (’83)
800 MHz band
Nordic Mobile Telephony (NMT)
Sweden, Norway, Demark & Finland
Launched 1981;
450 MHz; later at 900 MHz (NMT900)
Total Access Communications System (TACS)
British design; similar to AMPS; deployed 1985
Some TACS-900 systems still in use in Europe
Second Generation :-
Digital mobile phones, including those that use GSM, CDMA or TDMA networks, are the second generation phones.
2.5 G & More:-
General Packet Radio Service (GPRS)
Enhanced Data Rates for Global Evolution (EDGE)