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Satellite phone

Cordless telephones allow a user more freedom of movement than conventional telephones. Cellular telephones extend the benefits of wireless communications over wide areas, and can be used in moving vehicles. Cellular systems although somewhat mobile are limited in coverage. They can only be used in the areas with there is cellular coverage. They additionally lack standardization in frequency, equipment and protocols between different carriers even with the same geographic area. When cellular phones are too distant from a base station, a communication path cannot be completed between the cellular phone and the base station leaving a caller undesirably stranded without ability to communicate. Satellite telephone systems are emerging as a new and important global business. Satellite-based cellular telephone systems are similar to terrestrial cellular telecommunication systems in that they have a grid of service zones or cells. They differ in that the satellite systems use a constellation of satellites with communication transponders instead of fixed radio towers as in terrestrial cellular systems. These systems utilize many individual circuits routed through one satellite or a constellation of many satellites to provide communications for terrestrial terminals. A satellite phone communicates directly with an orbiting satellite thereby permitting the user of the phone to make or receive a phone call from virtually anywhere on earth. Satellite telephone system provides ubiquitous coverage of large areas of the earth without requiring the construction of many small terrestrial cells.

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