{"id":29547,"date":"2021-12-18T00:01:28","date_gmt":"2021-12-18T00:01:28","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=29547"},"modified":"2021-12-14T16:23:14","modified_gmt":"2021-12-14T16:23:14","slug":"openreach-uk-trial-improvement-to-broadband-isp-dlm-resets","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2021\/12\/openreach-uk-trial-improvement-to-broadband-isp-dlm-resets.html","title":{"rendered":"Openreach UK Trial Improvement to Broadband ISP DLM Resets"},"content":{"rendered":"

Openreach<\/a> (BT<\/a>) has informed UK ISPs with Fibre-to-the-Cabinet (FTTC<\/a> \/ VDSL2<\/a>) and G.fast<\/a> based broadband lines that they will shortly be running a new trial to test an improvement to the current reset process within the Dynamic Line Management (DLM) system, which could aid copper line stability a bit.<\/p>\n

The current DLM system is used to automatically control the speed and stability of copper based broadband lines (ADSL<\/a>, VDSL2<\/a> and G.fast<\/a>), which in practice means that your speed may go up or down depending upon how stable \/ error-prone (interference etc.) DLM thinks the line is. New FTTC<\/a> lines are usually provided with a default speed and error protection settings, which change as DLM learns.<\/p>\n

In the past broadband providers have had very little control over DLM profiles for hybrid-fibre lines, although since 2017\/18 we have seen a number of changes to improve that and last year a new Amend DLM Profile functionality was introduced, which allowed ISPs to “request a DLM reset on any FTTC<\/a> service that you own<\/em>” (here<\/a>). But now there’s another change coming.<\/p>\n

Openreach<\/a>’s public briefing on the latest change – a “Dynamic Line Management (DLM) Reset Process Improvement Trial<\/a>” – doesn’t tell us anything, but the operator was kind enough to help us fill in the blanks.<\/p>\n

So what’s new?<\/strong><\/span><\/h3>\n

At present, it’s sometimes useful to reset a line’s DLM profile, such as after a fault has been fixed by an engineer. The reset itself changes both the speed and error protection to default values, which may lead to a short period of suboptimal performance while the line goes through another stabilisation period (a similar period – lasting about a week – usually occurs on new lines too).<\/p>\n

However, Openreach<\/a> and ISPs have collaborated to design a better process, which is what this trial reflects. Under the trial, a DLM profile reset will now return the speed to default values, but leave the error protection largely untouched. The trial, which might help to mitigate the usual period of suboptimal performance, will last a few months and run nationwide.<\/p>\n

None of this will change what profile the line settles on after a fault has been fixed, as that will remain subject to the ongoing whims of DLM and the environment, but it should make the transition during that stabilisation period a bit quicker and less noticeable to the customer. At least, that’s the hope.<\/p>\n","protected":false},"excerpt":{"rendered":"

Openreach (BT) has informed UK ISPs with Fibre-to-the-Cabinet (FTTC \/ VDSL2) and G.fast based broadband lines that they will shortly be running a new trial to test an improvement to the current reset process within the Dynamic Line Management (DLM) system, which could aid copper line stability a bit.<\/p>\n","protected":false},"author":1,"featured_media":24164,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[55,417,69],"class_list":["post-29547","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-fttc","tag-g-fast","tag-bt-openreach"],"share_on_mastodon":{"url":"","error":""},"yoast_head":"\nOpenreach UK Trial Improvement to Broadband ISP DLM Resets - ISPreview UK<\/title>\n<meta name=\"description\" content=\"Openreach (BT) has informed UK ISPs with Fibre-to-the-Cabinet (FTTC \/ VDSL2) and G.fast based broadband lines that they will shortly be running a new\" \/>\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\/2021\/12\/openreach-uk-trial-improvement-to-broadband-isp-dlm-resets.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Openreach UK Trial Improvement to Broadband ISP DLM Resets - 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