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GPS
The Global Positioning System is a worldwide radio-navigation system that
was developed by the US. Department of Defence. In addition to military
purposes it is widely used in marine and terrestrial navigation (for example car
navigation systems).
GSM 1800
GSM cellular system operating in the 1800 MHz frequency band (also referred
to as PCN or PCN 1800 or DCS 1800). Primarily used in urban areas in
Europe.
GSM 1900
GSM-based cellular system operating in the 1900 MHz frequency band (also
referred to as PCS 1900 and DCS 1900). Primarily used in urban areas in the
US.
GSM 900
Global System for Mobile communication. Digital cellular network operating
in the 900 MHz frequency band. This system is the most extensively used
worldwide, having been adopted in over 100 countries in Europe, Asia, etc.
In many such countries, GSM provides international roaming service.
H.323
The H.323 recommendation was formulated by ITU in 1996. It is an umbrella
recommendation that defines multimedia communication algorithms and
protocols for IP-based Local Area Networks. The newest version of the
standard will also be used under mobile packet networks.
G-H
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