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Line 1: {{~~unreferenced~~no footnotes\|date=October 2012}} A '''satellite modem''' or '''satmodem''' is a [[modem]] used to establish [[data transfer]]s using a [[communications satellite]] as a [[relay]]. 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). == Satellite link == Line 15 ⟶ 16: Similarly, a signal received from a satellite is firstly [[downconverter\|downconverted]] (this is done by a [[Low-noise block converter]] - LNB), then demodulated by a modem, and at last handled by data terminal equipment. The LNB is usually powered by the modem through the signal cable with 13 or 18 V [[Direct current\|DC]]. == Features == The main functions of a satellite modem are modulation and demodulation. Satellite communication standards also define [[error correction]] codes and [[framing (World Wide Web)\|framing]] formats. Line 42 ⟶ 44: * ''Embedded Distant-end Monitor and Control'' (EDMAC), allowing to control the distant-end modem; * ''Automatic Uplink Power Control'' (AUPC), that is, adjusting the output power to maintain a constant [[signal-to-noise ratio\|signal to noise]] ratio at the remote end; * [[Drop and insert]] feature for a [[multiplexing\|multiplexed]] stream, allowing to replace some channels in it. == Internal structure == Line 101 ⟶ 103: == Applications == [[File:NovelSat Satellite Modem NS3000.png\|thumb\|The NS3000 Satellite Modem modulates and demodulates data and video signals transmitted via satellite.]] [[File:ASTRA2Connect Modem front.jpg\|thumb\|right\|The "~~IPmodem~~IP modem" (satellite modem") developed and made by Newtec of Belgium for [[SES ~~S.A.~~(company)\|SES]]' 2Mbit/s [[ASTRA2Connect]] European two-way satellite Internet system]] Satellite modems are often used for home [[satellite internet\|internet access]]. Line 112 ⟶ 114: == See also == * [[Communications satellite]] * [[Data collection satellite]] * [[Al Yah Satellite Communications\|Yahsat]] * [[Intelsat]] Line 118 ⟶ 121: == External links == #* ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.113, definition: ''satellite link [http://www.itu.int/ International Telecommunication Union (ITU)]''▼ #* {{cite thesis \|last=Talal, \|first=M. (\|date=1997). ''\|title=Modem design for digital satellite communications'' ~~(Doctoral dissertation,~~\|type=PhD \|publisher=Loughborough University). \|url=https://core.ac.uk/download/pdf/288390356.pdf \|id=uk.bl.ethos.362760}}▼ {{Satcomm}} ~~== References ==~~ ▲# ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.113, definition: ''satellite link [http://www.itu.int/ International Telecommunication Union (ITU)]'' ▲# Talal, M. (1997). ''Modem design for digital satellite communications'' (Doctoral dissertation, Loughborough University). https://core.ac.uk/download/pdf/288390356.pdf [[Category:Satellite broadcasting]]