I

IBS
INTELSAT Business Services, a tariff for satellite capacity based on standard terminals.

IFL
Inter-facility Link. The cable or waveguide connecting the indoor equipment with the outdoor equipment in a satellite terminal installation

Inclination
The angle between the equatorial plane and the orbit of a satellite. Geostationary satellites generally begin their lives at low inclination. However, once their station keeping fuel is exhausted it may continue to operate in inclined orbit, accessed by antennas that can track the satellite.

Information
Data is transmitted to represent information, ie. something that was not known or could be calculated by the receiver prior to transmission.

INMARSAT
International Maritime Satellite Organisation

INTELSAT
International Telecommunications Satellite Organisation

Internetworking
The process of connecting networks together. The largest example of this is the Internet.

IOR
Indian Ocean Region, a group of orbital positions for satellite serving Europe, Africa and Asia

Interference
Another form of noise, this time generated by other transmitters

IP address
The Address of a host on the internet or a private IP network

IP subnet
A collection of IP hosts directly connected with one-another and sharing the same initial digits in their IP addresses.

IRD
Integrated Receiver Decoder; the indoor device translates signals from the satellite to be suitable for presentation to a TV

ISDN
Integrated Services Digital Network a public, circuits switched data network based on n x 64kbit/s connections

Isotropic antenna
Hypothetical omni-directional antenna used a reference for calculating the gain of real antennas

ISP
Internet Service Provider, provides an access point to the Internet

ITU
International Telecommunication Union; standards and regulation body for telecommunications worldwide.