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The National Broadband Network (NBN) is a national wholesale-only, open-access data network and is under development in Australia. It is based on the premise that fixed line and wireless broadband connections are sold to retail service providers (RSPs), who then sell Internet access and other services to consumers. The NBN was subject to political and industry debate for a number of years, before construction actually commenced. The 2013 federal election and subsequent change of government from the Labor Party to the Liberal/National Coalition prompted a strategic review to be commissioned to determine the ideal infrastructure mix to deliver fast broadband across the country as quickly as possible, whilst also reducing costs. The review commenced in October 2013 and is due to report to government in December 2013. In opposition, the Coalition made clear it expected the technology mix could include Fibre-to-the-Node (FTTN) and Fibre-to-the-Building (FTTB) architectures, existing Hybrid Fibre Coaxial (HFC) networks and other privately operated fibre broadband infrastructure, along with the existing NBN Co technologies of Fibre-to-the-Premises (FTTP), satellite and Long Term Evolution (LTE) fixed wireless. Since taking government, the Coalition has not backed away from these intentions, though the then Communications Minister Malcolm Turnbull stated he is "thoroughly open" to whatever recommendations the strategic review of the NBN makes in terms of the best technology infrastructure mix. The redesigned network is currently estimated by the Liberal National Coalition to cost in public funding to construct by 2019.〔 The build cost has been a key point of debate. NBN Co, a government-owned corporation, was established to design, build and operate the NBN, and construction began with a trial rollout in Tasmania in . The fibre to the premises (FTTP) rollout was planned to reach approximately 93% of premises in Australia by , but following a change of government, it is now expected to reach an unknown percent of the population. This will be represented by a mix of greenfields (new development) areas where it wouldn't be cost effective to lay new copper, as well as some of the brownfields (established neighbourhoods) areas where the existing copper is deemed to be severely affected by ground water or other factors, or simply where the NBN fibre rollout has already advanced to a point where it wouldn't be cost effective to turn back to copper. Most of Australia's copper network is affected by water due to extensive use of faulty gel for insulation in the past. As of 3 November 2013, construction of the network had passed 354,793 premises and there were 109,862 active customer services. In areas where the Fibre-to-the-Premises network is being rolled out, FTTP will gradually replace the copper network which is owned by Telstra and currently used for most telephony and data services. As part of an agreement with NBN Co, Telstra will move its customers to the NBN, and lease access to its exchange space and extensive network ducting to assist in the rollout. A similar agreement with Optus is in place. However, the new Liberal National Coalition government is currently considering whether these arrangements will continue as part of its strategic review of the NBN. As of 30 June 2015, the company announced 1,011,973 premises are now able to order NBN services. Of that, 571,527 brownfields and 180,796 greenfields premises are able to order fixed-line services, Communications Minister Malcolm Turnbull said. An additional 220,917 premises are able to order services in fixed wireless, and 38,743 premises have connected to the interim satellite service. ==Network design== 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「National Broadband Network」の詳細全文を読む スポンサード リンク
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