Transmission

A single transponder on one of these satellites (the part of the satellite that transmits signals back to Earth) is capable of handling approximately 100 million bits of information per second. This means that if the transponder is accessed for only 90 seconds per day, close to a billion bytes of data would be transferred — the equivalent of 865,000 double-spaced pages. With this immense capacity, today's communication satellites are an ideal medium for transmitting and receiving almost any kind of content, from simple data to the most complex and bandwidth-intensive video, audio and data content.

VSAT

A Very Small Aperture Terminal is the collective name for the satellite equipment used at a remote site connected to network or satellite terminals. The equipment comprises antenna, transmitter, receiver and modem. Its name comes from the relatively small size of antenna, typically 75cm to 120cm in diameter.

Hub

The satellite earth station acts as a central coordinating point between a network of VSATs in a star configuration and connects them together to route all traffic between them and to and from external networks, such as public networks like the Internet and private WANs.

Satellite communications?

Definition

Satellite communication is delivered via wireless receiver/ transmitters and a transponder on a satellite in space — essentially a radio-frequency repeater that is launched by a rocket and placed in orbit around the earth. Satellites provide one of the most effective means of transmitting and receiving just about any kind of data: fax, files, video, audio and IP-based applications like the Internet.
Geostationary orbit
Most communication satellites in use today are geostationary. They orbit the Earth directly over the equator, approximately 22 000 miles (35 400 km) up. At this altitude, one complete trip around the Earth (relative to the sun) takes 24 hours. Thus, the satellite remains over the same spot on the surface of the earth (geo) at all times, and stays fixed in the sky (stationary) from any point on the surface from which it can be "seen." A single geostationary satellite can "see" approximately 40 percent of the Earth's surface. Three such satellites, spaced at equal intervals (120 angular degrees apart), can provide coverage of the entire civilised world.
VSAT
A Very Small Aperture Terminal is the collective name for the satellite equipment used at a remote site connected to network or satellite terminals. The equipment comprises antenna, transmitter, receiver and modem. Its name comes from the relatively small size of antenna, typically 75cm to 120cm in diameter.
Hub
The satellite earth station acts as a central coordinating point between a network of VSATs in a star configuration and connects them together to route all traffic between them and to and from external networks, such as public networks like the Internet and private WANs.
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Other terms, language and abbreviations can be found in the glossary

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