In reply to a post by zzing123:

In reply to a post by Pheasant:

Here is the Openreach XGS-PON Supplier Technical Information Note with all the speed tiers, including 2.5 and 3.3 Gbps symmetric tiers.

I do wonder how they came to these 'prioritised' rates. On xDSL these were actually the Committed Information Rate, which was the bandwidth guaranteed when using Ethernet products over this, eg EoFTTC / EoFTTP etc. 'Prioritised' suggests there's no longer a guaranee and also the bandwidth's are seemingly all a bit arbitrarily defined.

Would love to see some insight into this and how this should be diced and sliced.

Personally I'd take the 2.488gbps/1.244gbps bandwidth across GPON and 9.952gbps on XGS-PON and divide by 32 (their max split) which equates to 77.75/38.875 on GPON and 311mbps on XGS-PON and align products on a fixed multiple (say 4x) of these values. So speeds up to 311mbps on GPON and 1.244gbps on XGS-PON. Anything faster on these techs is just selling old rope imo and slamming straight into a very hard wall.

You'd ignore the compulsory 15% FEC overhead on XGSPON in these very precise calculations I guess.

I wonder if OR will actually be using 50GPON OLTs? Adtrans latest ones do GPON/XGS-PON/50GPON all on the same OLT for example.

While I'd expect they'd use XGS-PON for the CPEs as it will be way cheaper, given ORs main cost is likely to be labour and system integration, wonder if it makes sense to use 50GPON capable OLTs so they don't need to rip it all out again in 5-10 years time?

Their OLT estate is a mixture of legacy Huawei, which as mandated by his majesty’s government they’re supplanting with Nokia and Adtran. A tiny bit, relatively, of ECI is left as ultra legacy.

Even with all the planned exchange closures they are serving FTTP from something like 959 handover exchanges. Many of these will have several OLT chassis. So it’s a fairly substantial estate.

Openreach also deliberately have multi source agreements in place, so broadly speaking they will deploy devices with an equivalent functionality and long term support basis. They have done some field tests over the live network with 50 GPON with Nokia in Ipswich, but I don’t believe they are looking at any commercial deployment until the prices and availability of such kit from all their key suppliers improves. So I would say they will continue with GPON and now XGS-PON for the immediate foreseeable future.

In reply to a post by mr_mojo:

I wonder if OR will actually be using 50GPON OLTs? Adtrans latest ones do GPON/XGS-PON/50GPON all on the same OLT for example.

The STIN very clearly states the service is XGS-PON. Having 50G optics sitting there doing nothing would be a waste. Equipment has a 5-10 year support lifecycle anyway.

Also, we are talking about a primarily residential service. If they were delivering 10G leased lines over PON then there might be an argument, but I expect they will to keep leased lines on dedicated fibres, in part to justify the premium pricing.

not sure if this will ever get into OR's portfolio ...

https://www.nokia.com/fixed-networks/lightspan-mf/

In reply to a post by candlerb:

Also, we are talking about a primarily residential service. If they were delivering 10G leased lines over PON then there might be an argument, but I expect they will to keep leased lines on dedicated fibres, in part to justify the premium pricing.

On security alone they will do so. That said i do think it might be wise for or to increase pon offerings to SMEs. Of course doing stuff on 10g pon is fine, its a beancounter job - span the investment over 5-7 years and you make a tidy profit.

I wouldn't be surprised if OR doesn't jump to 50gb pon but takes 25g pon first becasue of cheapness but wait and see.

In reply to a post by candlerb:

Fewer and fewer people run home NASes these days. If you ask Mr & Mrs Average, they are streaming from Netflix / Amazon / Apple / Spotify etc.

And in any case, if you have a home NAS, you don't care about Internet upload, since the content stays local.

I would love extra upload for my NAS. It's not used at all for streaming, but for local site backups of important emails, docs., etc. It then gets backed up to the Cloud, so yes, give me more upload please.

In reply to a post by Taras:

not sure if this will ever get into OR's portfolio ...

https://www.nokia.com/fixed-networks/lightspan-mf/

Pretty sure I read somewhere that they use 7360 ISAM FX chassis from Nokia. Adtran chassis seem a lot smaller, so more required to serve a larger area. The big Nokias will take up to 16 cards.

In reply to a post by adslmax:

People want better upload for home NAS server streaming straight to TV in every rooms

Yes, that's true and I never said for once that upload speed wasn't important, for many content creators upload is even more important than download!
What I meant is that a package with a limit of 10 or 15Mbps is so slow that it is ridiculous to include it as separate XGS-PON FTTP packages.

Originally we had 40/10, 40/15 and 80/20 speed packages under FTTC. The technological limitation is the only compelling excuse for Openreach to offer such packages as FTTC doesn't allow higher than 20Mbps upload speed!

But here we are talking about FTTP and that too with XGS-PON. My argument was that such lower tier packages shouldn't be included. The lowest starting package should be 100/100 by default like what most of the other Altnets provide!

For this reason, I feel it is very mischievous to be offering such lower tier asymmetric packages because then most users simply won't see a need to upgrade to FTTP for these lower tier packages. Though, we all know that once Openreach do upgrade us to FTTP then we can't order an FTTC package in that area ever again. Openreach thus want to force us to pay extra to have symmetrical speeds and that isn't really fair considering how long some customers have waited for the XGS-PON upgrade while others have finally waited to get Openreach FTTP.

Of-course I suspect this is going to affect rural customers the most as they are more likely to have Openreach FTTP without another Altnet FTTP network to choose from. But in urban areas with other Altnet offerings Openreach might have a more challenging time to get customers if they offer these asymmetric tier packages.

We all know what Openreach and BTWholesale are like. BTw don't sell cheaper if want symmetric on Openreach FTTP. Maybe leased line are much cheaper than BTw for contention ratio of 1:1 with symmetric speed up to 1Gbps for home.