Wireless Network

Characteristics of Mobile Network

First Generation(1G):starts from 1980

AMPS,NMT,TACS
Analog
Voice services

Second Generation(2G):starts from 1992
GSM,D-AMPS
Digital
Voice/Data services(low speed)

Third Generation(3G):starts from 2001
UMTS,cdma2000
Digital
Voice/Wideband multimedia services

Frequency Bands of GSM

GSM900

Uplink:800~915 MHZ
Downlink:925~960 MHZ

GSM1800

Uplink:1710~1785 MHZ
Downlink:1805~1880 MHZ

GSM1900(Used in America & Canada)

Uplink:1850~1910 MHZ
Downlink:1930~1990 MHZ