GPON vs. GEPON

Fri Jan 8 12:56:45 UTC 2016

It all depends on how it is designed as well.

Take a Calix E7-2. You could do a pretty high split per gpon port, I think
either 32 or 64 is the max for them, but you're really just shooting
yourself in the foot IMO if you're advertising and selling a lot of gig
service.

A 8-16 way split per gpon is more reasonable. I think the current cards are
4-10 gpon ports per, and 2 cards per E7-2. I know they have 2x10Gbps LAG
working for uplink, can't remember if 4x10Gbps LAG works yet or not.

Count in oversubscription rates for residential, and consider that most
people, despite what they say or think, will end up on 2.4GHz wireless in
the home due to 5GHz sucking more than a room away - that ends up being a
very scalable solution for residential service.

For SMB, they end up on a different split, or with SLA end up on an active
port on the chassis or on the Juniper access/transport switch.
On Jan 8, 2016 4:05 AM, <nanog-isp at mail.com> wrote:

> > If you take out "bitrate, split ratio, cross vendor compatibility and
> purchase price differences" then what else would you like to compare or
> know?
>   All the interesting bits obviously :)
>   Anybody can read the bitrates, split ratios, compatibility and price of
> a spec sheet/quote. That however leaves out all the interesting operative
> aspects such as auxiliary network requirement, service turn up and software
> tool differences between the two standards.
>   The hard facts only cover the CAPEX part of the TCO equation and the
> differences between GPON and GEPON are small. Controlling for any parameter
> roughly equal or if any different within a constant factor of less than two.
>   I'm more interested in the OPEX part, to find out if there are any
> (significant) differences between the two.
>
> I welcome all insight into the operative aspects of GPON and/or GEPON,
> regardless if you have used one or both.
>
> >> One, you can deliver a true 1Gbps service where more than one customer
> on a PON segment can actually get 1Gbps at a time, because the GPON
> supports 2.4Gbps of
> >> total usage on the segment.
>   I know this is a quote of a quote, whose origin I do not know, but I
> would not feel comfortable offering "a true 1Gbps service" on any PON
> system with less than 10G of capacity. Plain GPON/GEPON is meant to be
> split vigorously to achieve cost savings in the OSP and as such aren't
> suitable for gigabit speeds. It's more like a 100M kind of technology.
>
>
> Jared
>