On Wed, 12 Dec 2018 at 06:48, Baldur Norddahl <baldur.norddahl@gmail.com> wrote:
> It is possible one should not choose this system over a traditional approach, but the people screaming "rip it out" are out of line IMHO. It would be a huge expense to rewire a building with copper and they already got a working fiber system. Much can be said about GPON but it is actually quite stable and easy to manage.
I don't think anyone is saying replace the existing fibre with copper,
but instead to run cheap SFP-equipped switches in basically the same
topology as the GPON you described.
That would still be costly in time and money with no obvious gain. You would get some downsides however. Now you have many single point of failures, a lot of small switches at the splitting points that need power backup and be managed. And exactly the same issue with PoE that someone raised. Only you will find more GPON ONT switches that already have the PoE with a battery build in, because those devices where made to answer that.
Again not saying that you would make a new build in any particular way, but to rip anything out of a brand new build requires justification. The original poster might indeed have justifications, but the people recommending to "rip it out" does not appear to have anything, but that this is GPON technology. If your justification is that you only want to work with technology known to you, then it is maybe you that needs to be replaced.
It is certainly possible to build something close to the GPON system using WDM instead. It is going to be more expensive. GPON splitters are very cheap, WDM splitters less so and the DWDM SFP modules way more expensive than the typical ONT. CWDM modules can be the same price as the ONT but you need to add a switch to that. You will also have a problem with the multi level tree approach.
For a new build, less splitting and more copper in-building would be
cheaper and easier.
Maybe. Those big fat copper runs get unwieldy and take up a lot of space. That GPON system might have a 12 fiber, 3 mm cable as the backbone and a maximum of 8 drop cables (2-3 mm) from the splitter. The drop cables are much smaller than cat 6 cabling.
Regards,
Baldur