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 <r...@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.
