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Ogi Become First UK ISP to Deploy Nokia’s 25Gbps Full Fibre Tech

Thursday, Dec 22nd, 2022 (12:01 am) - Score 7,584

Broadband ISP and network builder Ogi, which is investing £200 million to build a new gigabit-capable Fibre-to-the-Premises (FTTP) network across 150,000 premises in Wales by 2025, has today become the first internet provider in the UK to deploy Nokia’s 25G PON technology commercially.

At present the provider, which is being backed by Infracapital (M&G Plc), has already connected premises across a number of locations since their rollout started last year (here and here) – including around Haverfordwest, Rhoose, Llantwit Major, St Athan and Abergavenny. The build has also progressed in Johnston, Milford Haven, Dinas Powys and Monmouth etc.

NOTE: Ogi has already completed deployment to 23,000 premises (June 2022) and their target of 150,000 premises is for Phase 1, but they also hold an aspiration to cover “at least” 350,000 premises in a future Phase 2 build across other parts of Wales (possibly rising up to 500,000).

In terms of the network itself, Ogi’s infrastructure has so far been deployed using dual optic combination line cards, which enables them to support both XGS-PON and GPON (common full fibre standards) simultaneously on any port of the Optical Line Terminal (OLT), which also enables them to be fairly flexible when it comes to future upgrades and that brings us to today’s big news.

The provider has just started to deploy Nokia’s next generation 25G Passive Optical Network (25G PON) fibre technology onto its network – initially bringing data speeds of 25Gbps (Gigabits per second) to Cardiff’s tech incubator, Tramshed Tech, which is currently home to 50+ business start-ups. A number of other operators, such as Openreach and Cityfibre, have trialled 25G PON from Nokia (here and here), but Ogi appear to be the first to make it part of a live commercial service.

Justin Leese, Ogi’s Chief Technology and Operations Officer, said:

“We talk a lot about our network – and full fibre – being future ready, and today we’re able to demonstrate this claim by installing Nokia’s latest technology on our network. As demand for speed and resilience increases – particularly in places like Cardiff – so too does the need for our network capabilities to pivot and flex.

Full fibre provides the opportunity to upgrade connectivity without the need to re-dig roads and, in its simplest form, upgrades are managed by switching out the technology at either end of the network. This is a significant step forward for business in Wales.”

Phil Siveter, CEO of UK and Ireland at Nokia, said:

“We are proud to have been selected by Ogi as one of the first UK deployments of our 25G PON technology, demonstrating the flexibility and capacity of our market leading fixed access solutions in delivering these leading and innovative UK services.”

At present many of Ogi’s full fibre rivals are still deploying 1Gbps to 10Gbps capable infrastructure solutions, thus the move to 25Gbps is quite a significant jump, albeit one that at present only really makes sense for connecting business sites like the one in Cardiff. But in time this will inevitably trickle down to cater for individual businesses and homes.

Nokia has previously highlighted how its 25G PON solution can happily co-exist with GPON and XGS-PON on the same infrastructure (this requires no changes to the outside plant), which allows network operators to add 25Gbps in overlay without disrupting existing customer services. This seems particularly well suited to the way Ogi has setup their network.

As the ISP says, no new fibres are needed for this, but in existing network areas customers would still need a new Optical Network Terminal (ONT) on their inside walls to get the top speed and the end-users’ router hardware must also be capable of supporting that. But as we said above, right now, 25Gbps is not intended as a solution for homes.

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By Mark Jackson
Mark is a professional technology writer, IT consultant and computer engineer from Dorset (England), he also founded ISPreview in 1999 and enjoys analysing the latest telecoms and broadband developments. Find me on X (Twitter), Mastodon, Facebook and .
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38 Responses
  1. Avatar photo Cn says:

    Virgin Media eat your heart out

    1. Avatar photo Winston Smith says:


  2. Avatar photo Pheasant says:

    The next leap to 50G PON will be more of a bunny hop

  3. Avatar photo Ex Telecom Engineer says:

    I can see some advantages of serving multiple businesses down a single fibre, without situating a mux on site, but there are DWDM alternatives for serving multiple occupancy buildings. Large city centre multi occupancy office buildings, housing the likes of Insurance companies, corporate law firms, and banks, are more likely to go for a more secure, dedicated and expensive symmetrical service.
    One big disadvantage of PON is that a bad actor could bring down multiple customers in one go, simply by disconnecting an ONT and inserting a light source into fibre; I realise that there’d be no motive for doing something like that, but some would do it just for mischief and if they’re clever about it by dropping the service intermittently over time, it would be difficult to diagnose. I suppose one way the provider might be able to diagnose such a fault, is to look for the first ONT to drop when the mischief maker disconnects the ONT, to connect the light source, but the mischief maker could insert a splitter at the ONT input and insert the light source whenever, without disconnecting the ONT, so that all ONT’s on the PON lose communications simultaneously; This could also apply to PON’s serving residential properties within an area, the more customers on the PON the more affected. The easiest way to reduce the risk of such events is to disconnect the local access fibres, from the splitters, when ONT’s are no longer required for service. Some might ask, why go to the expense and trouble of doing something like the scenario above? but some would do it just because they can and it’s probably the biggest disadvantage of serving multiple customers on a a single OLT/PON.
    Most customers will switch providers when leaving their current provider and I’ve no idea what happens in respect of the current ONT’s and access fibres when service is switched, so the above scenario’s may not happen, but if a service is discontinued without switching would the old ONT and the access fibres remain connected? I would hope the providers would be aware of these issues and have processes in place to mitigate the risk of this type of scenario.
    Would the above possible risk scenarios discourage businesses from utilising a PON service, or even sharing a fibre with multiple PON customers where the business is on a bespoke wavelength?

    1. Avatar photo XGS Is On says:

      A bad actor with a pair of wire cutters could have fun regardless of PON or not.

    2. Avatar photo Ex Telecom Engineer says:

      “A bad actor with a pair of wire cutters could have fun regardless of PON or not.”

      In the case of a PON, that would be a hard fault on the aggregate side of the splitter, so it would be easy to locate with an OTDR and fix. With the scenario I gave, the perpetrator wouldn’t need to interfere with any external infrastructure, and could simulate an intermittent fault that would be extremely hard to diagnose and locate. My scenario may never happen but it’s a possibility and an inherent security weakness of PON design. In my scenario, any customer sharing the PON could potentially interfere with other customers on the same PON, for reasons best known to themselves; Very unlikely, I know, but people with axes to grind do some strange things. There have been cases of transmitters used to intermittently disrupt radio broadcasts and channels for trivial reasons, so someone with enough knowledge could disrupt a PON if they’re that way inclined. A large business may not want to risk the scenario, I highlighted, and would have to consider alternative access to mitigate the risks of losing PON fibre connectivity for various reasons.
      Dedicated Fibres do get cut, but are easily located and fixed. Locating a Fibre break is easy with an OTDR, giving the exact location of the break within a metre, or closer, dependent on the range setting and pulse width.

  4. Avatar photo anonymous says:

    BT Openreach will deploy this in 100 years time making sure the country is well behind others at that stage and cap in hand for tax payer handouts in forms of subsidies or separated BB deployment funded projects….

    1. Avatar photo Alex says:

      There will be no handouts for upgrades that are entirely done in the exchange, that is only necessary due to the cost of laying the fibre itself.

    2. Avatar photo haha says:

      We will all be dead anyway so….

      Personally as someone with 1Gbps I think this is enough for any household. If 390GB/Hour is not fast enough for you – buy it.. I don’t I will ever need to upgrade again

    3. Avatar photo Winston Smith says:

      Openreach, like many ISPs, may never deploy it and skip to 50GPON when avaiable as that will likely have a wider choice of hardware suppliers.

    4. Avatar photo XGS Is On says:

      Think Openreach are going to be running 25GPON to at least some extent. They’re a Nokia shop and Nokia are pretty big on 25GPON.

      I know of a couple of altnets planning on going straight to 50 in the middle of the decade.

  5. Avatar photo Pheasant says:

    Meanwhile in Abu Dhabi yesterday…

    Nokia and etisalat by e& show first 100 Gbps fiber broadband in Middle East and Africa


    1. Avatar photo Matt says:

      How does a demo of 100G matter, when they’re actively rolling out 25gbps here?
      If they were rolling 100 gbit I’d be more upset.

      Not that the middle east is comparable to the UK in any way.

    2. Avatar photo Pheasant says:

      @Matt. Lighten up pal. It’s an evolution of the PON tech

      Happy Crimbo chief.

    3. Avatar photo Bubbles says:

      ah yes, Etisalat. the network charging ~£220 a month for unlimited data.

    4. Avatar photo haha says:

      That’s less than I pay for 1Gbps. i’ll take it!

  6. Avatar photo James says:

    Would love info on the kit/models of olt/ont.

    1. Avatar photo James says:

      Hi Justin,

      Thanks so much for this, but I was mainly curious about the customer device i.e the ONT.. for example is it 25g symmetric on the pon side and what interface is it customer side i.e 10G copper? Does it fit on a wall or is it a rack mount unit

    2. Avatar photo Justin says:

      Hi James – it’s a rack mount unit and has a UNI port which will take a 25Gb or 10Gb SFP. There’s also a dedicated GE port and a 1PPS port. PON port can be 25/25 or 25/10.

      If you pop onto my LinkedIn repost of the ISPReview article I’ve dropped a photo of the ONT into the comments.

    3. Avatar photo XGS Is On says:

      That ONT is a beast, Justin. Hopefully they will be miniaturised while keeping the SFP28 port.

  7. Avatar photo Anon says:

    Can someone please provide an explanation here as I am not sure I understand fully? The deployment of this equipment is for the backend, it is undoubtedly not to deploy 25Gbit to each individual household or Business.

    Of course, they have the option to increase and provide higher bandwidth to each customer but this is to make the network run more efficiently and decrease cost per customer as they can increase bandwidth without the need to change equipment.

    1. Avatar photo Justin says:

      Hi – no this is 25Gbps on the customer access network. Obviously aimed at business customers with high traffic demand.

      The backhaul network is based on Huber+Suhner DWDM with the capability of providing up to 40 wavelengths at 100Gbps each.

    2. Avatar photo Anon says:

      Feels like a deployment just for the sake of marketing. There reaches a point where PON for a customer wanting 25Gbps doesn’t make sense.

      See Init7 and their ActiveE 25Gbps deployment in Switzerland – https://ripe84.ripe.net/wp-content/uploads/presentations/73-RIPE84_20220518_25G_OneYear.pdf

    3. Avatar photo XGS Is On says:

      Yeah Init7 are in a good place: they can rent dark fibre from Swisscom.

      Swisscom themselves use 25GPON.

  8. Avatar photo finaldest says:

    Well OGI are extremely close to my area so good to know they are using the latest tech. Just hope they have something to announce soon regarding any new deployment.

    Voneus are currently planning to build in my area (Currently in design phase) and openreach don’t currently have any plans.

    We have the poles in place with the splitter boxes so just waiting for the fibre to be installed. The question is who will deploy first because once one provider arrives the rest will follow.

    1. Avatar photo Anon says:

      Just hope that it is Openreach deploying locally first, followed by OGI and then Voneus. Terrible local support from Voneus since they acquired local operators and haven’t invested in competent staff.

      Think about your long term options, having an altnet deploy first is great, but you will be tied into their network, none of those building in Wales today have a compelling wholesale offering.

  9. Avatar photo PON2_FTTH_4_WALES says:

    Ogi Ogi Ogi!!
    In Llanelli, North Dock area definitly needs this..
    I’m already hitting your servers over on speedtest Cardiff servers with all of my 1G FTTP lol..
    I hope to see Ogi in my part of Carmarthenshire “Offering Multi-Gig **Symetrical** Connections”. 110mbps currently is nice but a symetrical 1Gbps pipe just looks neater on speedtests 🙂
    25G/100G/200G/400G/800G Lets have it!

  10. Avatar photo Phil says:

    haha says:
    December 22, 2022 at 2:17 pm

    We will all be dead anyway so….

    Personally as someone with 1Gbps I think this is enough for any household. If 390GB/Hour is not fast enough for you – buy it.. I don’t I will ever need to upgrade again

    You will be reborn again but in a different family name. Then u can try it out once you get to 18 years old again. LOL. I don’t believe there is any god up there in heaven, I always believe when we all died, we will reborn again.

    1. Avatar photo the_moebius says:

      The problem is, everyone seems to think that “1Gbps is fast enough”. It might be, for now – but as time goes on, we will all find that 1Gbps – believe it or not – wont be. Just consider, 20 years ago we were all pleased to get 512kbps, then 1Mbps, 2, 8, etc – it’s good enough for a while, but then the rest of the technology moves on and then we all look to the world of telecoms for the next step. Everytime, there will always be someone who says “xxx speed is fast enough”. Well apologies, but you do not speak for everyone!

      If you don’t want 1Gbps, then don’t buy it – let the rest of us move on and progress – because everything else is moving on, even if you aren’t.

    2. Avatar photo Ad47uk says:

      @the_moebius, comparing now with what was going on 20 years ago don’t really go well. 20 years ago we did not do the streaming we do these days and certainly not at the quality. It was only when Netflix started to become a thing in the UK that people started to need better broadband and even then, people who were close to the exchange could get a pretty decent speed at the time as long as their ISP was any good. I could get 3Mb/s if I was lucky when I was last on ADSL, that is why I went for wireless broadband. 1Gb will be more than fast enough for most people even if they have a family in the house for years to come, unless we get some super-duper high-res video service that is better than 8K and since 8K is not really something that have taken off I can’t see it myself.

      Maybe we will need faster speeds for holograms.

      I have 436Mb/s and to be honest I can’t any reason why I would need more unless I have someone move in and then I would only need 100Mb/s if that.

      If people want faster speeds, that is fine, as long as they don’t fall for the sales pitch that many providers will be sprouting now. My next door nigh have Sky FTTC, I have already said to them not to be taken in by paying more for something they don’t require, All they use the broadband for is a bit of music on Alexa and some browsing on a tablet, they don’t even stream on their Sky Q box, which really defeats the purpose but there you go.

      Most people don’t look to telecoms for the next step, they really don’t unless they are getting awful broadband, I realise I don’t speak for everyone when I say I am fine with 36Mb/s and see no point of going for Fibre, but I also don’t like to see people paying more for a service they don’t need, certainly not at this time when some people are struggling

    3. Avatar photo Ad47uk says:

      @the_moebius the 436 Mb/s in the post above is supposed to be 36Mb/s, still not used to this keyboard.

    4. Avatar photo Ad47uk says:

      You already have 1Gb connection? The way you go on thought you had a really slow broadband.

    5. Avatar photo the_moebius says:

      Ad47uk – proved my point perfectly.

    6. Avatar photo K says:


      What about new technologies that havent taken off yet? Windows 365, cloud computing?
      You dont seem to realise that when faster speeds come out new technologies are designed to use the faster speeds. Not the other way around. 1GB will only do for another few years max before new uses come out that use faster.

    7. Avatar photo Ad47uk says:

      @K, Windows 365 and cloud computing is not something that joe blogs is not going to use, that will be more for business, which higher speeds are for. The alt network here offers 2Gb/s, I doubt very much if they will get many takers. It is the pushing of faster speed to your normal Joe that annoys me, sure if they want or feel they need it then fine, but the majority would never need 1Gb. But as been said the 25Gb is more for business and they are the ones that will use cloud computing, maybe

      @the_moebius, what proved your point? I am just saying that most people will not need more than 1Gb/s, I done’t really need any more than the 36Mb/s I have now. When people asks me if I am going for fibre, they are surprised when I say no as don’t need the speed, and then they ask me why i think I don’t need the speed, I turn it back on them and say, why do I need the speed and they clam up as they have no answer.

      My sister-in-law have just changed to BT fibre 400Mb/s, she only went for that speed as Bt gave her a price that was the same as a slower speed, they will never make full use of it. when the end of the contract comes she will go to a slower speed.

  11. Avatar photo Marketing Spin says:

    Other than the marketing there’s no benefit in a rollout of 25GPON as this stage. Customers needing that level of bandwidth are best served over dedicated point to point links. For PON the density doesn’t make much sense today.

    Both Openreach and Cityfibre tested it with Nokia in 2021. There’s a reason why Cityfibre decided to proceed with XGSPON instead 6 months later:


  12. Avatar photo Ad47uk says:

    I realise it is not for the home user, I would have use of a 1Gb connection, so 25 would certainly be an overkill, but then I don’t have a use for 100Mb/s. But i do wonder how much that would cost.

Comments are closed

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