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SwiftBroadband〔(【引用サイトリンク】title=Swwift BroadBand Factsheet )〕 is an IP-based packet-switched communications network that provides a symmetric ‘always-on’ data connection of up to 650 kbit/s〔(【引用サイトリンク】title=High Speed Data Rate )〕 per channel for aircraft globally except for the polar regions, using the Inmarsat satellite constellation. ==Details== Designed to compete in the business aviation communications market, it has been studied as an approach for Air Traffic Management by Eurocontrol (the pan-European air traffic management organization).〔(【引用サイトリンク】title=Future Communications Study )〕〔(【引用サイトリンク】title=Year Book )〕 In Standard IP mode, the service is shared with other concurrent users of the system, providing a ‘best effort’ service. SwiftBroadband can also provide a pre-determined quality of service through Streaming mode. There are 200 spot beams per satellite with each beam supporting up to 90 channels of 432kbit/s.〔http://www.atnconference.com/downloadppt.php?id=264〕 Three satellites cover the entire globe with the exception of the polar regions.〔(Global Coverage Map )〕 For Standard IP service, the throughput that an end-user experiences depends on the load on the channel as well as other factors such as antenna type and data compression. SwiftBroadband uses the narrow spot beams of the Inmarsat-4 (I-4) satellites. Features of the service include: Standard IP data – currently up to two channels per aircraft; Up to 432 kbit/s per channel over a high-gain antenna and up to 332 kbit/s over an intermediate gain antenna Streaming IP data on demand at 32, 64, 128, 256, 384, and 650 kbit/s〔〔http://www.cobham.com/media/156229/332_cobham_swiftbroadband_%20x-stream_flight%20trials.pdf〕 which can be combined for higher rates; simultaneous voice and high-speed data; packet-switched data (TCP/IP) and ISDN; circuit-switched voice and VoIP.〔(【引用サイトリンク】title=Data Rate Testing )〕〔(【引用サイトリンク】title=IP Data Connections )〕〔(【引用サイトリンク】title=ISDN Packe-Data )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SwiftBroadband」の詳細全文を読む スポンサード リンク
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