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IBS (Intelsat Business Services)

Inclination

The angle between the orbital plane of a satellite and the equatorial plane of the earth expressed in degrees of inclination.

INMARSAT

The International Maritime Satellite Organization operates a network of satellites for international transmissions for all types of international mobile services including maritime, aeronautical, and land mobile.

INTELSAT

The International Telecommunications Satellite Organization operates a network of satellites for international transmissions.

Interference

Energy which tends to interfere with the reception of the desired signals, such as fading from airline flights, RF interference from adjacent channels, or ghosting from reflecting objects such as mountains and buildings.  Interference which occurs on the satellite is usually generated from other uplink facilities signals or from natural occurring spatial phenomenom such as solar flares and sunspots.  Uplink and downlink interference that is generated from a nearby source on the ground is referred to as terrestrial interference (TI).

Interlaced Video

Lines of spatial information in a video signal. Interlaced video lines consists of two fields, a top field and a bottom field. One of these fields will commence one field period later than the other.

IRD (Integrated Receiver/Decoder)

IRT (Integrated Receiver/Transcoder)

ISDN - Integrated Services Digital Network

A CCITT standard for integrated transmission of voice, video and data. Bandwidths include: Basic Rate Interface - BR (144 Kbps - 2 B & 1 D channel) and Primary Rate - PRI (1.544 and 2.048 Mbps).

ISO - International Standardization Organization

Isochronous

(1) A constant-rate of transmission necessary for video and audio streams. The term isochronous defines the characteristics of the clock that is associated with synchronous data. An isochronous clock has a jitter specification that defines position of the edges of the clock at any instant in time.
(2) A window that displays in the UCS software used to specify the isochronous data component.

Isotropic Antenna

A hypothetical omnidirectional point-source antenna that serves as an engineering reference for the measurement of antenna gain.

ITU - International Telecommunication Union

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