Communications Systems Glossary

 

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    Gateway.  A gateway is an application layer (Layer 7) device that interconnects two local area networks (LANs).

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    Gain.  The gain is the ratio of the input power to the output power of a circuit or device. Gain is normally measured in dB.

    Gaussian distribution.  A Gaussian distribution is a normal distribution.

    General Packet Radio Service (GPRS).  The general packet radio service (GPRS) is a 2.5G add-on to GSM and other second generation cellular communications systems that provides an always-on packet data capability.

    Geostationary earth orbit (GEO).  A geostationary earth orbit (GEO) is a special case of a geosynchronous orbit when the satellite’s period of rotation equals the Earth’s period of rotation, and the satellite is always positioned over the same location above the Equator.

    Geosynchronous orbit.  A geosynchronous orbit is a satellite orbit in which the period of rotation of the satellite is a multiple of the Earth’s period of rotation. When the satellite’s period of rotation equals the Earth’s period of rotation, the satellite is always positioned over the same location and is called geostationary.

    Global System for Mobile Communication (GSM).  Global System for Mobile Communication (GSM) is a European-based digital cellular communication based on time-division multiple access (TDMA).

    Go-back-N automatic repeat request (Go-back-N ARQ).  Go-back-N ARQ is nn error correction technique in which the transmitter sends blocks whose size is determined by a window size. Not every block requires acknowledgement and a NACK from the receiver has the transmitter go back a predetermined number of blocks and begin to retransmit those blocks.

    Guardband.  A guardband is used to separate sub-channels in frequency-division multiplexing (FDM) to avoid crosstalk.

     

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    Our other resources include Antennas, Appliances, Broadband Internet, CDMA, Communications Systems, GSM, Modems, Project Management, Radar, Risk Management and Decision Making, Satellite Communications, SMS, Speakers, Systems Engineering, Team Building, Time Management, Transmitters and Receivers, and XML.
     
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