GaAs
- Gallium Arsenide. GEO - Geosynchronous
Earth Orbit satellite. Geosynchronous systems include Inmarsat and OmniTRACS.
The Inmarsat system uses allocations in the 6 GHz band from the ground station
to the satellite, 1.5 GHz for the satellite-to-terminal downlink, 1.6 GHz
for the terminal-to-satellite uplink, and 1 GHz from the satellite to the
ground station. Glare Hold and Glare
Release - A method of glare resolution. Glare occurs when both the
local and distant end of a trunk are seized at the same instant; this usually
results in deadlock of the trunk. To prevent this, one end of the trunk is
assigned a glare hold status and the other a glare release status. In the
event of glare, the glare hold end holds the trunk and the glare release end
releases the trunk and attempts to seize another. Used between MTSO and connecting
cell sites. GLONASS - The Russian
Global Navigation Satellite System is similar in operation and may prove complimentary
to the NAVSTAR system. Launched in 1996, is a 24 satellite constellation 19,100
Km above the earth in three orbital planes. GMSK - Gaussian
Minimum Shift Keying. A form of frequency shift keying which shapes pulses
to minimize spectral leakage. Used in GSM. GNSS - Global Navigation
Satellite Systems. Extended GPS systems, providing users with sufficient accuracy
and integrity information to be useable for critical navigation applications.
GPS - Global Positioning
Satellite. Satellite-based radio positioning systems that provide 24 hour
three-dimensional position, velocity and time information to suitably equipped
users anywhere on or near the surface of the Earth (and sometimes off the
earth). GPS is a 24 satellite constellation, 20,000 Km above the earth in
six orbital planes. The NAVSTAR system, operated by the U.S. Department of
Defense, was the first GPS system widely available to civilian users. Grade-of-Service
- A measure of what percentage of calls placed through an exchange fail to
be completed due to congestion of that exchange. In cellular, a 2% GOS is
considered acceptable. GSM
- Global System for Mobiles.
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