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Fiber to the ''x'' (FTTX) is a generic term for any broadband network architecture using optical fiber to provide all or part of the local loop used for last mile telecommunications. The term is a generalization for several configurations of fiber deployment, ranging from FTTN (fiber to the neighborhood/node) to FTTD (fiber to the desktop). ==Definitions== The telecommunications industry differentiates between several distinct FTTX configurations. The terms in most widespread use today are: *FTTN / FTTLA (''fiber-to-the-node, -neighborhood, or -last-amplifier''): Fiber is terminated in a street cabinet, possibly miles away from the customer premises, with the final connections being copper. FTTN is often an interim step toward full FTTH (fiber-to-the-home) and is typically used to deliver 'advanced' triple-play telecommunications services. *FTTC / FTTK (''fiber-to-the-curb/kerb, -closet, or -cabinet''): This is very similar to FTTN, but the street cabinet or pole is closer to the user's premises, typically within , within range for high-bandwidth copper technologies such as wired ethernet or IEEE 1901 power line networking and wireless Wi-Fi technology. FTTC is occasionally ambiguously called FTTP (fiber-to-the-pole), leading to confusion with the distinct fiber-to-the-premises system. *FTTdp (''Fibre To The Distribution Point'') This is very similar to FTTC / FTTN but is one-step close again moving the end of the fiber to within meters of the boundary of the customers premises in last junction possible junction box known as the "distribution point" this allows for near-gigabit speeds *FTTP (''fiber-to-the-premises''): This term is used either as a blanket term for both FTTH and FTTB, or where the fiber network includes both homes and small businesses. * *FTTB (''fiber-to-the-building, -business, or -basement''): Fiber reaches the boundary of the building, such as the basement in a multi-dwelling unit, with the final connection to the individual living space being made via alternative means, similar to the curb or pole technologies. * *FTTH (''fiber-to-the-home''): Fiber reaches the boundary of the living space, such as a box on the outside wall of a home. Passive optical networks and point-to-point Ethernet are architectures that deliver triple-play services over FTTH networks directly from an operator's central office.〔Tim Poulus, ("FTTH networking: Active Ethernet versus Passive Optical Networking and point-to-point vs. point-to-multipoint" ), ''Telecompaper'', 17 November 2010. Retrieved 12 July 2013. 〕〔Ed Gubbins, ("Active Ethernet grows in PON's shadow" ), ''NXTcomm Daily News'', Penton Media, 13 May 2008. Retrieved 12 July 2013.〕 *FTTD (''fiber-to-the-desktop''): Fiber connection is installed from the main computer room to a terminal or fiber media converter near the user's desk. *FTTE / FTTZ (fiber-to-the-telecom-enclosure or fiber-to-the-zone) is a form of structured cabling typically used in enterprise local area networks, where fiber is used to link the main computer equipment room to an enclosure close to the desk or workstation. FTTE and FTTZ are not considered part of the FTTX group of technologies, despite the similarity in name.〔Robert Reid, ("All multimode fiber is not created equal" ), Cabling Installation & Maintenance, PennWell Corporation, February 2007, retrieved 12 July 2013.〕 To promote consistency, especially when comparing FTTH penetration rates between countries, the three FTTH Councils of Europe, North America, and Asia-Pacific agreed upon definitions for FTTH and FTTB in 2006,〔 〕 with an update in 2009, 2011 and another in 2015. The FTTH Councils do not have formal definitions for FTTC and FTTN. 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「Fiber to the x」の詳細全文を読む スポンサード リンク
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