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Fibre satellite distribution is a technology that enables satellite TV signals from an antenna to be distributed using an optical fibre cable infrastructure and then converted to electrical signals for use with conventional set-top box receivers. Particularly applicable to satellite TV distribution systems in a multi-dwelling unit, such as a block of flats (but useful in smaller domestic distribution systems too), such a hybrid fibre/electrical system reduces the cabling required, reduces signal noise and interference, and provides for an easy upgrade to increase the number of tuners connected at each dwelling.〔"(Giving co-ax the axe )" ''What Satellite & Digital TV'' (April, 2009) 130-131"〕 Conventional systems that distribute the electrical satellite IF signal via a star network of coaxial cable require one relatively short cable run from the central distribution equipment to each tuner connected to the system, whereas in a fibre system, cables can be very long, and split at successive locations, in a tree structure without detriment to the reception. ==Advantages== The primary benefit of using optical fibre for a satellite TV IF distribution system is that the fibre can carry the entire received spectrum on one cable, which can then be split to provide for multiple tuners, without requiring a separate feed from the antenna to each tuner. Additional outlets can be added to increase the number of receivers within one home without accessing the central antenna or main infrastructure. Fibre cable is cheap in long runs, retailing at about twice the price of equivalent copper coaxial cable, but replacing four runs of coaxial cable with a single fibre cable. It is also much smaller than the coaxial signal cable used for electrical IF distribution, but robust and flexible. The losses in a fibre system are almost negligible so very long cable runs of hundreds of metres are possible without any signal reinforcement. Because the signal is carried as a beam of light, it is impervious to the electrical interference that even the best coaxial satellite cable may suffer, and cables can be safely and conveniently run alongside mains power cables. Power consumption is also lower than an equivalent electrical system.〔(【引用サイトリンク】title= Fibre Optic Solutions )〕 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「Fibre satellite distribution」の詳細全文を読む スポンサード リンク
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