MOBILE DEFINITIONS :
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2G
The name usually given to original GSM, CDMA, and TDMA networks. It uses the spectrum more efficiently than
analog (1G) systems, and offers digital encryption of conversations. 2G networks introduced data services for
mobiles starting with SMS.
3G
Analog cellular phones were the first generation while digital marked the second generation.
3G is loosely defined, but generally includes high data speeds, always-on data access, and greater voice
capacity.
The high data speeds are possibly the most prominent feature, and certainly the most hyped. They enable such
advanced features as live, streaming video.
There are several different 3G technology standards. The most prevalent is UMTS, which is based on WCDMA
(the terms WCDMA and UMTS are often used interchangeably).
3GP video
3GP is a simplified version of the MPEG-4 Part 14 (MP4) container format, designed to decrease storage and
bandwidth requirements in order to accommodate mobile phones. It stores video streams as MPEG-4 Part 2 or
H.263 or MPEG-4 Part 10 (AVC/H.264), and audio streams as AMR-NB, AMR-WB, AMR-WB+, AAC-LC or HE-AAC.
3GP is designed for effieciency to make it suitable for Streaming across mobile phone networks and storing on
mobile devices with very littel storage capacity. Video rarely exceeds a QVGA resolution of 320 x 240 pixels but
there are VGA or even D1 resolution exceptions. Audio is usually encoded as either MP3 or AAC -LC (Low
Complexity). Framerates for most mobile devices are Limited to 15fps.
There are two different standards for this format:
3GPP (for GSM-based Phones, may have filename extension .3gp)
3GPP2 (for CDMA-based Phones, may have filename extension .3g2)
Both are based on MPEG-4 and H.263 video, and AAC or AMR audio.
When transferred to a computer, 3GP movies can be viewed on Linux, Mac, and Windows platforms with
MPlayer and VLC media player. Programs such as Media Player Classic, Totem, RealPlayer, QuickTime, and
GOM Player can also be used. Some cell phones use the .mp4 extension for 3GP video.
802.11
802.11 is a set of IEEE standards for wireless local area networks (WLAN). The most common variant is
802.11g, which is backwards compatible with the older B variant. 802.11g devices are sometimes marked as
802.11b/g to indicate this compatibility. There is a newer version - 802.11n - that provides higher maximum
speeds and better range.
The 802.11g standard's typical speeds are rated up to 54 Mbps.
