Communications Systems Glossary

 

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    Independent sideband (ISB).  The number of single-sideband (SSB) channels that can be transmitted over a given communication system is determined by the minimum frequency separation of the channels.

    IP (Internet protocol).  The Internet Protocol (IP) is an internetworking protocol that provides connectionless service across multiple packet-switching networks.

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    IEEE 802.3 standard.  The IEEE 802.3 standard is a standard for carrier-sense multiple access/collision detection ( CSMA/CD) networks.

    IEEE 802.4 standard.  The IEEE 802.4 standard is a standard for token bus networks.

    IEEE 802.5 standard.  The IEEE 802.5 standard is a standard for token-ring networks.

    Impulse noise.  Impulse noise is noise that is caused by a high-amplitude, short-duration noise pulse.

    Inductance.  Inductance is the property exhibited by an inductor, or any wires or devices that are physically arranged to resemble an inductor.

    Inductor.  A current passing through a wire will produce a magnetic field around the wire. Winding the conductor into a coil strengthens the magnetic field. The resulting element is called an inductor, whose inductance (L) is measured in the unit henry (H). The voltage across an inductor is directly proportional to the time rate of change of the current through it. An inductor therefore acts as a short circuit to DC.

    Infrared (IR).  Infrared describes the electromagnetic radiation of wavelengths between visible light and radio waves (in the approximate range of 770 nm to 1 mm).

    Institute of Electrical and Electronic Engineers (IEEE).  The Institute of Electrical and Electronic Engineers is a US-based professional society for electrical and electronic engineers.

    Integrated Services Digital Network (ISDN).  The Integrated Services Digital Network (ISDN) provides for the integration of voice and data (as well as other formats such as video and graphics images) over a digital transmission network.

    Intermediate circular orbit (ICO).  An intermediate circular orbit (ICO) is a circular satellite orbit of heights between 10,000 km and 15,000 km above the earth. Also called medium earth orbit (MEO).

    Intermediate frequency (IF).  The basis of a superheterodyne radio receiver is the conversion of the wanted signal frequency into a constant frequency known as the intermediate frequency (IF). It is at this intermediate frequency that most of the gain and the selectivity of the receiver is provided without affecting the bandwidth of the receiver.

    International Standards Organization (ISO).  The International Standards Organization (ISO) is an international standards organisation, covering a range of areas including telecommunications.

    International Telecommunications Union (ITU).  The International Telecommunications Union is an international telecommunications standards organisation. ITU-R: ITU-Radio. ITU-T: ITU-Telecommunications.

    Internet.  The Internet is a specific collection of interconnected networks spanning the world.

    Internetwork.  An internetwork is a collection of local area networks ( LANs) normally connected together with routers.

    Internetworking.  Internetworking is the interconnection of local area networks (LANs), normally through the use of routers.

    Interoperability.  Interoperability is the ability of one piece of communications equipment to exchange information with another.

    Inverse multiplexer.  An inverse multiplexer is a multiplexer that provides a high-speed circuit between two devices by aggregating multiple lower-speed circuits.

    ISO OSI reference model.  See Open Systems Interconnection (OSI) reference model.

    Isotropic.  Isotropic means radiating equally in all directions.

     

    To propose other words or phrases to be added to our glossary, please contact Argos Press. Please contact Argos Press to obtain information on licensing our content (including this glossary entry on Communications Systems). © Argos Press Pty Ltd, Canberra, 2003-2004. All rights reserved.

    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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