A satellite modem or sat modem is a modem used to establish data transfers using a communications satellite as a relay.
There is a wide range of satellite modems from cheap devices for home internet access to expensive multifunctional equipment for enterprise use.
A "modem" stands for "modulator-demodulator". A satellite modem's main function is to transform an input bitstream to a radio signal and vice versa. There are some devices that include only a demodulator (and no modulator, thus only allowing data to be downloaded by satellite) that are also referred to as "satellite modems". These devices are used in satellite Internet access (in this case uploaded data is transferred through a conventional PSTN modem or an ADSL modem).
Other articles related to "satellite modem, satellite modems, modems, satellite":
... Satellite modems are often used for home internet access ... Video Broadcasting (DVB) standard as their basis One-way satmodems (DVB-IP modems) use a return channel not based on communication with the satellite, such as telephone or cable ... Two-way satmodems (DVB-RCS modems, also called astromodems) employ a satellite-based return channel as well they do not need another connection ...
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