Would be very expensive too. You'd need separate DFB lasers & receivers for all wavelengths and a WDM on the front end.

Cheaper to go with one or the other. Most of them are a few quid in bulk.

I would like to see self-service ONT swaps become a thing - you get a text message with a link to a webpage that can access your phone camera, scan the barcode of the old ONT to verify you have the correct service, scan the new box, then return the old one with a prepaid label. Maybe include a single-use fibre cleaner as well to wipe the connector across during the swap.

In reply to a post by Pheasant:

Would be very expensive too. You'd need separate DFB lasers & receivers for all wavelengths and a WDM on the front end.

Cheaper to go with one or the other. Most of them are a few quid in bulk.

So, basically very messy!

I'd go with unnecessarily complex (and expensive) 😅

In reply to a post by jpm:

I would like to see self-service ONT swaps become a thing - you get a text message with a link to a webpage that can access your phone camera, scan the barcode of the old ONT to verify you have the correct service, scan the new box, then return the old one with a prepaid label.

we are only going to see xgs pon and 25gbit pon in the next 10 to 20 years. so whilst a good idea and i like it, i don't think the savings will be that great.

In reply to a post by jpm:

Maybe include a single-use fibre cleaner as well to wipe the connector across during the swap.

probably multi use, and also what if they broke the cable!!!!!!!!! 😂

In reply to a post by Taras:

they have dynamic throttling on the download as it is, and mostly its fine and i really can't see more then 2 users on a 30 user pon having 1Gbit symmetrical. Only heard of a video guy who ended up having the pon split into two. Spliting a pon into two isn't that expensive (as long you have spare fibre) to do.

How do you split a PON in two? I guess you would need a spare fibre to feed into a second splitter, and then put 16 prems on each? That would cause service disruption to some of the prems while the switchover occured?

In reply to a post by Taras:

even going to xgs-pon shouldn't be an issue in terms of cpe install. Its a shame theres no combined gpon/xgs-pon ont, as you could move users dynamically between the two depending on bandwidth needs .

On that note how does a GPON service get upgraded to XGS-PON without long outages as presumably the OLT line cards all need changing out? The customer's ONT can stay as you can have GPON and XGS-PON running at the same time but if the line cards only had GPON originally, there must be disruption for a few hours to swap it over?

In reply to a post by jpm:

I would like to see self-service ONT swaps become a thing - you get a text message with a link to a webpage that can access your phone camera, scan the barcode of the old ONT to verify you have the correct service, scan the new box, then return the old one with a prepaid label. Maybe include a single-use fibre cleaner as well to wipe the connector across during the swap.

Doesn't that risk the customer damaging the fibre cable during the swap? What about the risk of them looking down the fibre and the laser shining at their eyes?

Correct. AT the splitter, you'd effectively move the CBT tails from one PON (hence OLT port) to another PON (different OLT port).

Openreach include a passive WDM (wavelength division multiplexer) at the head, so that another feed can be supplied into the PON. As GPON and XGS-PON use different wavelengths they can both co-exist on the same PON / same glass, without service disruption or interruption.