{"id":37236,"date":"2024-02-20T08:19:15","date_gmt":"2024-02-20T08:19:15","guid":{"rendered":"https:\/\/www.ispreview.co.uk\/?p=37236"},"modified":"2024-02-20T08:19:15","modified_gmt":"2024-02-20T08:19:15","slug":"openreach-deploy-g-inp-to-boost-uk-eci-fttc-broadband-lines","status":"publish","type":"post","link":"https:\/\/www.ispreview.co.uk\/index.php\/2024\/02\/openreach-deploy-g-inp-to-boost-uk-eci-fttc-broadband-lines.html","title":{"rendered":"Openreach Deploy G.INP to Boost UK ECI FTTC Broadband Lines"},"content":{"rendered":"

Openreach<\/a> (BT<\/a>) has finally succeeded in deploying ReTransmission (ReTx \/ G.INP) across their ECI (Ribbon) based UK estate of Fibre-to-the-Cabinet (FTTC<\/a> \/ VDSL2<\/a>) broadband ISP cabinets and customer lines, which comes after many years of trying to get the technology to work. The result is faster speeds and improved stability.<\/p>\n

The news these days is typically dominated by deployments of full fibre (FTTP<\/a>) broadband lines, which makes it easy to forget that around 15 million lines are still using Openreach<\/a>’s previous hybrid-fibre (FTTC<\/a>) technology, and so any developments on this front remain very important.<\/p>\n

NOTE:<\/strong> Pictured is an example of an ECI based DSLAM FTTC<\/a> Cabinet (256 Ports). Take note that ECI is today known as Ribbon.<\/div>\n

One such enhancement is called G.INP<\/strong> (ITU G.998.4), which is an error correction solution that was designed to help resolve spikes of Electromagnetic Interference<\/strong> (impulse noise) and thus improve a line’s stability, as well as its performance. The introduction of this technology can, on some VDSL2<\/a> lines, even produce a small to modest increase in service speed (downloads).<\/p>\n

The technology is nothing new to Openreach<\/a>, which has already got it to work on their larger estate of Huawei<\/strong> based cabinets. But unfortunately the same cannot be said for those using kit from ECI<\/strong>. Various past attempts have been made to fix the ECI issues and all have run into problems (examples here<\/a>, here<\/a> and here<\/a>).<\/p>\n

Suffice to say, deploying G.INP to ECI based hybrid-fibre broadband cabinets has proven to be considerably more complex than was the case with Huawei cabinets, which is due to a mix of issues (e.g. problems with modem \/ router compatibility within homes and DLM compatibility).<\/p>\n

What’s new with G.INP<\/strong><\/span><\/h3>\n

Last spring (2023) a number of our readers started reporting that G.INP had finally been enabled in their ECI dominated area again, although at the time we opted not to cover this due to the long stop-start history of related trials. Not to mention that this was only occurring in some ECI areas and not all.<\/p>\n

However, the good news today is that Openreach has finally identified the specific combination of parameters that had the potential to trigger the issues seen during the previous trials, and they’ve now reconfigured their Dynamic Line Management<\/strong> (DLM) system to avoid this combination.<\/p>\n

NOTE:<\/strong> The DLM system automatically controls 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.) it thinks your line is.<\/div>\n

As we understand it, both ISPs and Openreach then agreed to initially commence a low volume deployment in April 2023, which unlike previous trials appears to have gone without any hiccups. The operator’s initial deployment was then accelerated in June 2023 and in February 2024 it finally reached completion (i.e. the entire ECI \/ Ribbon estate of cabinets has now been upgraded, including SOGEA ones).<\/p>\n

The Results<\/strong><\/span><\/h3>\n

According to data seen by ISPreview, the average improvement in unconstrained lines (i.e. those not achieving the maximum speed their chosen speed tier allows) is 3Mbps and there has been a 25% increase in the number of lines achieving their “up to<\/em>” speed (i.e. those achieving the maximum speed their chosen speed tier allows).<\/p>\n

Line stability has been improved by the upgrade too, which also means that error protection is now always-on and lines are thus better defended from unwanted noise (interference). The trade-offs with the previous approach meant that error protection was only enabled if a line suffered instability, which in turn meant that lines often had to suffer that period of instability before protection could be applied.<\/p>\n

Finally, network latency (response time in milliseconds) has also been significantly improved. For example, the previous type of error protection introduced an 8ms, 16ms or 24ms delay when applied. But ReTransmission has no such inherent impact on latency when applied, so lines previously using the former error protection will see a reduction in latency of 8ms – 24ms.<\/p>\n

In summary, it’s great to see that Openreach are still willing to spend the time and money to find ways of squeezing extra bits of performance out of even older technologies, particularly those that have proven to be such tough nuts to crack. The operator has persevered because G.INP offers considerable benefits to the many customers still using an FTTC product from a Ribbon DSLAM \/ cabinet.<\/p>\n

However, it is important to remember that there are a very small number of VDSL2 modems (these are often built into your broadband router) that don’t support G.INP \/ ReTransmission, so these are excluded, as is already the case on those covered by Huawei’s cabinets. Some more problematic or faulty lines may also see G.INP being disabled.<\/p>\n","protected":false},"excerpt":{"rendered":"

Openreach (BT) has finally succeeded in deploying ReTransmission (ReTx \/ G.INP) across their ECI (Ribbon) based UK estate of Fibre-to-the-Cabinet (FTTC \/ VDSL2) broadband ISP cabinets and customer lines, which comes after many years of trying to get the technology to work. The result is faster speeds and improved stability.<\/p>\n","protected":false},"author":1,"featured_media":22678,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[55,69],"class_list":["post-37236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uk_isp_news","tag-fttc","tag-bt-openreach"],"share_on_mastodon":{"url":"https:\/\/mastodon.social\/@ispreview\/111962833429173837","error":""},"yoast_head":"\nOpenreach Deploy G.INP to Boost UK ECI FTTC Broadband Lines - ISPreview UK<\/title>\n<meta name=\"description\" content=\"Openreach (BT) has finally succeeded in deploying ReTransmission (ReTx \/ G.INP) across their ECI (Ribbon) based UK estate of Fibre-to-the-Cabinet (FTTC \/\" \/>\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\/2024\/02\/openreach-deploy-g-inp-to-boost-uk-eci-fttc-broadband-lines.html\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Openreach Deploy G.INP to Boost UK ECI FTTC Broadband Lines - 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