{"id":13246,"date":"2017-01-11T08:56:54","date_gmt":"2017-01-11T08:56:54","guid":{"rendered":"http:\/\/www.ispreview.co.uk\/?p=13246"},"modified":"2017-05-02T08:30:04","modified_gmt":"2017-05-02T07:30:04","slug":"bt-testing-co-existence-g-fast-vdsl2-17-6mhz-spectrum","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2017\/01\/bt-testing-co-existence-g-fast-vdsl2-17-6mhz-spectrum.html","title":{"rendered":"BT Testing Co-Existence of G.fast and VDSL2 in up to 17.6MHz of Spectrum"},"content":{"rendered":"

One of the problems with BT<\/a>’s new 330Mbps capable hybrid-fibre G.fast<\/a> technology (ITU G.9700\/9701) is that it can’t harness all of its spectrum (106MHz) because it needs to avoid interfering with the existing VDSL2<\/a> (FTTC<\/a>) based “fibre broadband<\/em>” service. But if they could co-exist.. speed boost.<\/p>\n

At present the dominant VDSL2<\/a> (up to 40-80Mbps) service uses up to 17.664MHz<\/strong> of spectrum, while G.fast<\/a> keeps its distance and uses spectrum between 19 – 106MHz<\/strong> in Openreach<\/a>’s (BT<\/a>) network. In this setup the two don’t have to worry about causing excessive interference and can operate alongside each other within BT<\/a>’s network, but G.fast<\/a> is clearly missing out on some performance.<\/p>\n

The other problem is that both technologies use two different forms of half \/ full duplexing (i.e. the transmission of data in two directions, either asymmetrically or symmetrically). On the one hand VDSL2<\/a> uses Frequency Division Duplex<\/strong> (FDD), while on the other G.fast harnesses Time Division Duplex<\/strong> (TDD). Suffice to say that getting the two to co-exist within the same spectrum would be incredibly difficult, but perhaps not impossible.<\/p>\n

Last year we became aware via the NICC<\/a>, which is a technical forum for the UK communications sector that develops interoperability standards for related public networks and services, that BT was conducting a “ground breaking<\/em>” technical study into the options for overlapping VDSL2 and G.fast spectrum up to 17.664MHz (slides<\/a>). In December we got a little more detail on this, but haven’t been able to report it until now due to the intense amount of pre-Christmas work.<\/p>\n

Apparently the key remaining problem is crosstalk interference<\/strong> from G.fast into VDSL2 and to what extent this difficult but predictable non-stationary crosstalk could be mitigated. Some readers may recall that crosstalk on VDSL2 (FTTC<\/a>) broadband lines occurs where lots of active copper lines would effectively create interference for one another, thus Vectoring<\/strong> was introduced and this works a bit like noise cancelling headphones (i.e. it coordinates the copper line signals in order to remove most of the interference).<\/p>\n

Some of our readers may recall that Vectoring had a troubled birth on Openreach<\/a>’s VDSL2 lines and a variety of problems meant that it has only ever been implemented in certain very specific \/ busy areas (i.e. where the problem is quite acute), which can help to return FTTC<\/a> speeds to more normal levels (here<\/a>). By comparison Vectoring has been built into G.fast by default and works much more smoothly.<\/p>\n

However BT’s technical bods are aware that true co-existence like this probably cannot be achieved without some trade-off in VDSL2 performance, although this assumes that the operator would stick with a purely static approach to spectrum management. We understand that BT is also looking at either a semi-static or dynamic option, although the latter might be too complex to implement.<\/p>\n

At present all of this is still subject to on-going work and no final decisions have yet been made (each approach will require a complexity vs. benefit analysis), although the impression we get is that co-existence may soon become a very real thing and this would then be followed by a related update to BT’s Access Network Frequency Plan<\/strong> (ANFP) and guidelines. The result could be a nice speed boost for G.fast and perhaps a slight improvement to coverage.<\/p>\n

So far as we’re aware BT appear to be the only operator that is currently considering all of these different techniques \/ options together and if they can pull it off then it would be a technically very impressive feat, although much may depend upon the penalty it introduces to VDSL2 performance (nobody likes to lose broadband speed).<\/p>\n

The group is being conducted by BT’s Head of Access Platform Innovation, Kevin Foster<\/strong>, who is also Chairman of NICC’s DSL<\/a> Task Group.<\/p>\n","protected":false},"excerpt":{"rendered":"

One of the problems with BT’s new 330Mbps capable hybrid-fibre G.fast technology (ITU G.9700\/9701) is that it can’t harness all of its spectrum (106MHz) because it needs to avoid interfering with the existing VDSL2 (FTTC) based “fibre broadband” service. But if they could co-exist.. speed boost.<\/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":[474,55,417,69],"class_list":["post-13246","post","type-post","status-publish","format-standard","hentry","category-uk_isp_news","tag-bt","tag-fttc","tag-g-fast","tag-bt-openreach"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"\nBT Testing Co-Existence of G.fast and VDSL2 in up to 17.6MHz of Spectrum - ISPreview UK<\/title>\n<meta name=\"description\" content=\"One of the problems with BT's new 330Mbps capable hybrid-fibre G.fast technology (ITU G.9700\/9701) is that it can't harness all of its spectrum (106MHz)\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ispreview.co.uk\/index.php\/2017\/01\/bt-testing-co-existence-g-fast-vdsl2-17-6mhz-spectrum.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"BT Testing Co-Existence of G.fast and VDSL2 in up to 17.6MHz of Spectrum - 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