{"id":14809,"date":"2017-10-19T15:32:49","date_gmt":"2017-10-19T14:32:49","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=14809"},"modified":"2017-10-25T13:21:13","modified_gmt":"2017-10-25T12:21:13","slug":"openreach-prep-second-fttc-fibre-broadband-spectrum-refarming-test","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2017\/10\/openreach-prep-second-fttc-fibre-broadband-spectrum-refarming-test.html","title":{"rendered":"UPDATE Openreach Prep Second FTTC Broadband Spectrum Refarming Test"},"content":{"rendered":"<p><a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/openreach\" target=\"_blank\">Openreach<\/a> (<a href=\"https:\/\/www.ispreview.co.uk\/index.php\/go\/britishtelecom\" rel=\"nofollow\" target=\"_blank\">BT<\/a>) has announced that they are to conduct a second Proof of Concept (PoC) trial of &#8220;<em>Spectrum Refarming<\/em>&#8221; technology, which in theory could result in a boost to broadband speeds by allowing different technologies (e.g. <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/fttc\">FTTC<\/a> \/ <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/vdsl\">VDSL2<\/a> and <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/gfast\">G.fast<\/a>) to share the same spectrum frequency.<!--more--><\/p>\n<p>We explained this in more detail during May 2017 (<a href=\"https:\/\/www.ispreview.co.uk\/index.php\/2017\/05\/bt-spectrum-refarming-trial-may-boost-uk-g-fast-fttc-broadband-speed.html\">here<\/a>), but here&#8217;s a quick recap. The current &#8216;up to&#8217; 80Mbps capable <strong>Fibre-to-the-Cabinet<\/strong> (<a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/fttc\">FTTC<\/a> \/ <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/vdsl\">VDSL2<\/a>) technology uses up to <strong>17.664MHz<\/strong> and their latest &#8216;up to&#8217; 330Mbps capable <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/gfast\">G.fast<\/a> service harnesses the spectrum between <strong>19-106MHz<\/strong> (in the future it will also be able to use up to 212MHz).<\/p>\n<p>Both services keep their spectrum separate in order to avoid interference and also because they use two different forms of half \/ full duplexing (i.e. the transmission of data in two directions, either asymmetrically or symmetrically): <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/vdsl\">VDSL2<\/a> uses <strong>Frequency Division Duplex<\/strong> (FDD) and <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/gfast\">G.fast<\/a> harnesses <strong>Time Division Duplex<\/strong> (TDD).<\/p>\n<p>However if it were possible for such services to co-exist in overlapping spectrum frequencies, which is incredibly difficult to do (vectoring may also be needed on VDSL2 and that&#8217;s not widely deployed), then you could in theory deliver faster speeds to consumers.<\/p>\n<p>An <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/openreach\" target=\"_blank\">Openreach<\/a> spokesperson told ISPreview.co.uk in May that their initial PoC, which took place on 300 lines in <strong>All Hallows<\/strong> (Kent) via two street cabinets, was &#8220;<em>an opportunity to explore a potential way of improving G.fast capability in terms of extending coverage and speed whilst protecting and in some circumstances improving VDSL2 performance<\/em>.&#8221;<\/p>\n<p>The first PoC only lasted for two weeks. Such trials typically reflect very early tests, which don&#8217;t always turn into tangible products. In that sense it&#8217;s perhaps a positive sign that <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/openreach\" target=\"_blank\">Openreach<\/a>, after having discussed the technology with ISPs during September and then again last week, has <a href=\"https:\/\/www.openreach.co.uk\/orpg\/home\/updates\/briefings\/super-fastfibreaccessbriefings\/super-fastfibreaccessbriefingsarticles\/nga03317.do\" target=\"_blank\" rel=\"noopener\">now decided<\/a> to conduct a second PoC of <strong>Spectrum Refarming<\/strong> that will commence from Thursday 16th November 2017 and run for another two weeks.<\/p>\n<p>Openreach would be unlikely to proceed with any upgrade that slashes <a href=\"https:\/\/www.ispreview.co.uk\/index.php\/link\/fttc\">FTTC<\/a> (VDSL2) speeds, but if their solution is able to overcome that challenge then it could prove to be a useful performance boost.<\/p>\n<p><strong>UPDATE 25th October 2017<\/strong><\/p>\n<p>Openreach informs ISPreview.co.uk that one of the objectives in their second test will be to build confidence in the feasibility of Spectrum Refarming to improve G.fast rate vs reach, ideally without negatively impacting VDSL2 services by applying refarming using tone blackout in conjunction with VDSL vectoring.<\/p>\n<p>The test will also involve a revised frequency plan that further mitigates impact to VDSL services capping VDSL at 14MHz instead of 12MHz used in the previous PoC and starting G.fast at 15MHz (usually 19MHz). Two street cabinets will be involved (two others will also be used but only as a control group) and they will be returned to normal once the test has completed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Openreach (BT) has announced that they are to conduct a second Proof of Concept (PoC) trial of &#8220;Spectrum Refarming&#8221; technology, which in theory could result in a boost to broadband speeds by allowing different technologies (e.g. FTTC \/ VDSL2 and G.fast) to share the same spectrum frequency.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[474,55,417,460,69,477],"class_list":["post-14809","post","type-post","status-publish","format-standard","hentry","category-uk_isp_news","tag-bt","tag-fttc","tag-g-fast","tag-kent","tag-bt-openreach","tag-science"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - 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