Re: Upstream bandwidth usage

[Dave Bell <me () geordish org>]

We are rolling out XGS-PON everywhere which is 10G symmetric. Just because
the PON runs at 10G, doesn't mean you need to provision all of your
customers at 10G.

We have a range of residential packages from 150Mbps up to 1Gbps symmetric.
The ONT is the same in all situations. There is no SFP cost, due to it
being a copper port. If we were to offer residential packages beyond 1G, a
CPE swap would be required, but there is little demand for that... yet...

The future is bright for PON with NG-PON2, and 50G PON on their way.

Regards,
Dave

On Fri, 10 Jun 2022 at 08:54, Vasilenko Eduard via NANOG <nanog () nanog org>
wrote:

> I did believe that it is about the cost of SFP on the CPE/ONT side: 5$
> against 7$ makes a big difference if you multiply by 1000000.
>
> By the way, there are many deployments of 10G symmetric PON. It was
> promoted for "Enterprise clients".
> CPE cost hurts in this case.
> But some CPE could be 10GE and another 1GE upstream (10G downstream) on
> the same tree.
>
> Ed/
> -----Original Message-----
> From: NANOG [mailto:nanog-bounces+vasilenko.eduard=huawei.com () nanog org]
> On Behalf Of Mel Beckman
> Sent: Friday, June 10, 2022 4:11 AM
> To: Raymond Burkholder <ray () oneunified net>
> Cc: nanog () nanog org
> Subject: Re: Upstream bandwidth usage
>
> I’m not mistaken, it also depends on the optics in the splitter, given
> that GPON is bidirectional single strand fiber.
>
> -mel via cell
>
> > On Jun 9, 2022, at 5:01 PM, Raymond Burkholder <ray () oneunified net>
> wrote:
> > 
> >
> > > On 2022-06-09 17:35, Michael Thomas wrote:
> > >
> > > > On 6/9/22 4:31 PM, Mel Beckman wrote:
> > > > Adam,
> > > >
> > > > Your point on asymmetrical technologies is excellent. But you may not
> be aware that residential optical fiber is also asymmetrical. For example,
> GPON, the latest ITU specified PON standard, and the most widely deployed,
> calls for a 2.4 Gbps downstream and a 1.25 Gbps upstream optical line rate.
> > > Why would they mandate such a thing? That seems like purely an operator
> decision.
> > There are also vendor issues involved.  I am glad that Mel mentioned
> 'optical line' rate.  Which becomes a theoretical thing.  If the line cards
> aren't set up with buffering properly, then line rate won't be seen.  And I
> think the line cards can also be easily over-subscribed.  Oh, and due to
> the two or three step fan-out of 8/16/32, upstream becomes even more
> limited.
> > So, if you have FTTH with 1::1 house::port, then you are cooking with
> fire.  Else, it is the luck of the draw in terms of how conservative the
> ISP is provisioning a GPON infrastructure.  Which, I suppose, depends if it
> is 1G or 10G GPON.