{"id":34738,"date":"2023-06-14T09:41:37","date_gmt":"2023-06-14T08:41:37","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=34738"},"modified":"2023-06-15T08:44:17","modified_gmt":"2023-06-15T07:44:17","slug":"openreach-trial-g-fast-broadband-dlm-tweak-to-improve-performance","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2023\/06\/openreach-trial-g-fast-broadband-dlm-tweak-to-improve-performance.html","title":{"rendered":"Openreach Trial G.fast Broadband DLM Tweak to Improve Speeds UPDATE"},"content":{"rendered":"

Openreach<\/a> has notified UK ISPs of an upcoming trial on their hybrid-fibre G.fast<\/a> based “ultrafast broadband<\/em>” (100Mbps+) products (including SOGFAST), which looks as if it will attempt to improve line performance by establishing the “most effective<\/em>” Dynamic Line Management (DLM) thresholds.<\/p>\n

Just to recap. Before the FTTP<\/a> rollout took centre stage in 2018\/19, Openreach<\/a> initially attempted to squeeze more out of their existing copper lines by deploying G.fast<\/a> technology from their local PCP street cabinets, which were fed by fibre (copper was only used for the final run into homes). The service ended up being rolled out to 2.83 million UK premises before it was effectively shelved in 2019 (here<\/a>), so that the operator could focus on full fibre.<\/p>\n

The service, much like ADSL2+ and FTTC<\/a> (VDSL2<\/a>) before it, harnessed a DLM<\/strong> system to automatically control the speed and stability of copper based broadband lines. In practice, this means that line speeds may go up or down depending upon how stable \/ error-prone (interference etc.) the system thinks your connection is (i.e. it monitors and learns – dynamically adjusting for changes on the line).<\/p>\n

Openreach<\/a>’s public briefing on the new trial merely says that it “aims to establish the most effective DLM Thresholds for the best Customer experience<\/em>” (here<\/a>) and, at the time of writing, we don’t have much information on the detail of what it will actually be adjusting.<\/p>\n

However, tentative feedback from our sources suggest that it may introduce less sensitive thresholds for Mean Time Between Errors<\/strong> (MTBE), which roughly reflects how many errors a line can get away with per day before the system takes action. Openreach thus appears to be seeking to establish which DLM thresholds produce the lowest propensity to call and lowest fault rates.<\/p>\n

In theory, such tweaks could aid line stability and performance, although this would vary and we’ve asked Openreach if they can provide a bit more detail to help us understand the adjustments they’re planning. On the other hand, most ISPs that did originally offer G.fast<\/a> packages (160Mbps and 330Mbps) have now stopped selling it due to a combination of factors – primarily overbuild by FTTP<\/a>, as well as issues with G.fast modem\/router availability and cost.<\/p>\n

Nevertheless a small portion of consumers do remain stuck in a location where G.fast is the best they can currently get. In that sense, it’s good to see that Openreach are continuing to find ways of improving a technology that is ultimately NOT going to be sticking around for a long time to come.<\/p>\n

UPDATE 15th June 2023 @ 8:55am<\/strong><\/p>\n

We’ve been able to gather a bit more information about the trial. Much as stated above, it’s about fine-tuning the MTBE parameters, with the aim of unlocking greater speeds for some of their G.fast lines.<\/p>\n

The parameters used today are largely based on learnings gained from Openreach’s existing Fibre-to-the-Cabinet<\/strong> (FTTC<\/a> \/ VDSL2<\/a>) network, however, G.fast uses additional technologies for tackling interference that allows lines to adapt to changes in real time. Put another way, a less sensitive configuration should allow greater speed without compromises to stability.<\/p>\n

At least, that’s the theory and the trial will test it. Only if this proves to be successful will the changes be rolled out across the operator’s entire G.fast network.<\/p>\n","protected":false},"excerpt":{"rendered":"

Openreach has notified UK ISPs of an upcoming trial on their hybrid-fibre G.fast based “ultrafast broadband” (100Mbps+) products (including SOGFAST), which looks as if it will attempt to improve line performance by establishing the “most effective” Dynamic Line Management (DLM) thresholds.<\/p>\n","protected":false},"author":1,"featured_media":22855,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[417,69],"class_list":["post-34738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-g-fast","tag-bt-openreach"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"\nOpenreach Trial G.fast Broadband DLM Tweak to Improve Speeds UPDATE - ISPreview UK<\/title>\n<meta name=\"description\" content=\"Openreach has notified UK ISPs of an upcoming trial on their hybrid-fibre G.fast based "ultrafast broadband" (100Mbps+) products (including SOGFAST),\" \/>\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\/2023\/06\/openreach-trial-g-fast-broadband-dlm-tweak-to-improve-performance.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Openreach Trial G.fast Broadband DLM Tweak to Improve Speeds UPDATE - 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