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To use the glossary, simply click on the first letter of
the term of interest below:
I
- IDSL
- ISDN-like Digital Subscriber Line, the slowest form
of xDSL, it provides full duplex symmetrical connectivity at 144 Kbps over
distances up to 10.7 Km (6.6 miles). For many rural users, it may be the only
higher-speed alternative over V.90 or slower modems. This type of transmission
does not support telephony over the same physical pair as does ADSL.
- IEE
- Institution of Electrical Engineers (London, UK)
- IEEE
- Institute of Electrical and Electronics Engineers (New York
City, USA) (formerly IRE, Institute of Radio Engineers).
- Interoperability
- The degree of compatibility among devices required to
operate with one another with reference to a specified feature set or
standard. This is an important consideration when mixing non-ITU-T compliant systems from
different manufacturers or when mixing ITU-T compliant systems from different
manufacturers which often may support different capabilities, allowable within the standards. Remember that many ITU-T systems revert to the highest common denominator for interability.
- IP
- Internet Protocol, packet transmission standard for the
transmission of data, voice, video and other information over the Internet.
- IP PBX
- IP Private Branch Exchange. A telephone, data and video
switching system, usually located on customer premises and belonging to the
user. Makes use of technologies like VoIP, H.323 and Ethernet.
- IR
- InfraRed, that portion of the electromagnetic
spectrum adjacent to the visible light spectrum and with longer wavelengths. IR
is often used for optical communications over FOTS or through the air.
- IRD
- Integrated Receiver-Decoder, the device to receive and decode television signals from DTH (direct to home) broadcast satellites or MMDS (wireless cable) systems.
- IRE Scale Units
- Institute of Radio Engineers scale units. A standard measure
of NTSC video signal amplitudes for which 140 IRE scale units equals 1.00 volt
peak-to-peak.
- ISDN
- Integrated Services Digital Network, see also
BRI and PRI. A switched digital service using a 16 Kbps
"D" channel for signaling and two or more 64 Kbps or 56 Kbps (some
US) "B" channels for data transmission.
- ISM
- Industrial, Scientific and Medical, unlicensed radio
bands.
- ISO
- International Standards Organization (Geneva, CH).
- ITU-R (formerly CCIR)
- An International Telecommunications Union (United Nations)
international telecommunications standards-setting body, specializing in
radio-spectrum usage.
- ITU-T (formerly CCITT)
- An International Telecommunications Union (United Nations)
international telecommunications standards-setting body specializing in
telecommunications.
- ITU-T-Compatible Codec
- jargon: For example, a video codec which meets all the minimum
requirements as set out in ITU-T Recommendations H.221, H.230, H.242, H.261 and H.320. To be compatible with the ITU-T Multipoint Control Unit (MCU), codecs also need to generate and receive the commands in H.231 and H.243. T.120 support is also desirable.
- IXC
- Inter-eXchange Carrier
To use the glossary, click on the first letter of
the term of interest:
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