Cellular Telephone – 1st Generation
AMPS – Advanced Mobile Phone Service –
first popular cell phone service; used
analog signals and dynamically assigned channels
D-AMPS – Digital AMPS – applied digital
multiplexing techniques on top of AMPS analog channels
PCS – Personal Communication Systems –
essentially all-digital cell phone service
PCS phones came in three technologies:
TDMA – time division multiple access
CDMA – code division multiple access
( the most is used in the America the more than from GSM.
GSM – global system for mobile communications
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Cellular Telephone – 2.5
Generation
AT&T Wireless, Cingular Wireless, and T-Mobile now using GPRS
(General Packet Radio Service) in their GSM networks
(can transmit data at 30 kbps to 40 kbps)
Verizon Wireless, Alltel, U.S.Cellular,
and Sprint PCS are using CDMA2000 1xRTT
(one carrier radio- transmission technology) (50 kbps to 75 kbps)
Cellular Telephone – 2.5 Generation
Nextel used IDEN technology
EDGE (Enhanced Data
Rates for Global Evolution) replaces GSM and
can transfer data at rates of 70 kbps to 135 kbps
Cellular Telephone – 3rd Generation
UMTS (Universal Mobile Telecommunications System) –
also called Wideband CDMA; the 3G version of
GPRS; UMTS not backward compatible
with GSM (thus requires phones with multiple decoders)
(200 kbps to 300 kbps)
1XEV (1 x Enhanced Version) – The 3G replacement for 1xRTT; will come in two forms:
1xEV-DO for data only (400 kbps to 700 kbps)
1xEV-DV for data and voice
Cellular Telephone – 3rd Generation
HSDPA (High Speed Downlink Packet Access) is an
extension of the GSM/EDGE technology. Data rates 400 kbps to 700 kbps.
EV-DO Rev.A – speeds up to 3.1 Mbps ? Due out in 2007-2008??
/*
/*Thise the information from DATA Communication
And Computer Network
Curt M.white
Depaul University/*
With Getting Abdullah Mohammad Al-iarri/*/*
