1G First generation wireless : analog cellphones. 1xRTT CDMA
Specifically,1xRTT (otherwise known as 3G 1x) represents one times
radio transmission technology with 1.25 MHz channels. This technology
supports peak data speeds up to 144 kbps, and up to a doubling of
voice capacity.

2G Second generation wireless: digital cellphones

2.5G 2G plus faster data services, also known as GPRS

3G Stands for "third generation" or "3rd generation", generally
applied to wideband mobile services and applications.

3GPP Third Generation Partnership Project, set up to expedite the
development of open globally-accepted technical specifications for 3G.

3GPP Release 99 The first set of specifications released by the 3GPP
for UMTS/ IMT-2000 , which include UTRA and the first set of UMTS
services, which corresponds to those of GSM, but with much higher data
rates. Additional security features are also included.

3GPP2 The Third Generation Partnership Project 2 is a collaborative
Third Generation (3G) telecommunications specification-setting project
comprising North American and Asian interests on the development of
the next generation cdma2000 wireless communications.

3GSP Stands for 3G service provider. It is mobile operators that have
3G license to provide 3G services to customers.

802.11 IEEE standards for wireless LANs with specs for 1-2, 11 and 24
Mbps with access points typically covering 50-100 meters each.

Air Interface In mobile phones, the 'air interface' denotes the
specification of the radio transmission between base station and
mobile phone. It defines the frequency use (frequencies), the
bandwidth of the individual radio channels (channels), the encoding
methods used (W-CDMA, TD-CDMA, cdma2000) and other quantities used by
the radio technology.

AMPS Advanced Mobile Phone System. North American analog cellular
phone system. Operates in the 800 MHz frequency band. AMPs is used in
South America and Asia Pacific. It has not been deployed in Eastern

Analogue The technology which until recently was the norm for mobile
phones, for example, 1G. It gives lower call quality and a major
security risk.

ANSI-41 Formerly known as IS-41 or TIA/EIA-41, this is a wireless
intersystem operation standard/protocol used for switch-to-switch and
network-to-network coordination with IS-136 and certain 3G standards.
The core network for cdma2000 is based on the ANSI-41 standard. For
3G, ANSI-41 and GSM MAP networks will be interconnected through a
signalling converter to realize global roaming.
Antenna A device used for receiving or transmitting signals.

ARPU Average revenue per customer.

ARIB Association of Radio Industry and Businesses. A Japanese standard-
setting body, organizational partner of the 3GPP and 3GPP2.

ATM Asynchronous Transfer Mode. A high bandwidth, controlled-delay
fixed-size packet switching and transmission system. Uses fixed-size
packets also known as "cells"; ATM is often referred to as "cell
relay." ATM will provide the basis for future broadband ISDN

Asynchronous Transmission A mode in which the sending and receiving
serial hosts know where a character begins and ends because each byte
is framed with additional bits, called a start bit and a stop bit. A
start bit indicates the beginning of a new character; it is always 0
(zero). A stop bit marks the end of the character. It appears after
the parity bit, if one is in use More.....