GPON vs. GEPON
baldur.norddahl at gmail.com
Wed Jan 6 16:30:30 UTC 2016
The solution for selling 1G internet with EPON could be 10GEPON. This is
still cheaper than GPON. The idea is that the ONU has a cheap standard 1G
transmitter. Apparently you can make a 10G receiver very cheap, it is the
transmitter that is expensive. So it is 10G downstream and 1G upstream.
With the option to deliver 10G upstream per ONU. It is about reusing
standard ethernet components that are dirt cheap - you can buy ethernet SFP
modules for peanuts after all and 10G SFP+ modules are not that expensive
However when we asked some vendors about this, nobody wanted to sell to us
because Europe (and USA I assume) is GPON while China is GEPON. They did
offer to sell us GPON at 10GEPON pricing instead...
Something fishy is going on. It is not about EC compliance as it is just a
matter of buying a 10GEPON card instead of GPON card to the same chassis
switch. Maybe patents?
On 6 January 2016 at 14:57, Colton Conor <colton.conor at gmail.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? Those would be the major differences I would say. We only deploy GPON
> here. I would say in a system like GEPON or GPON where a port is shared
> between users more bandwidth is better, and GPON has more capacity than
> GEPON. I am not sure which region you are in, but in the USA GEPON is
> almost non-existent from the larger players. Meaning that most GEPON
> equipment won't be ANSI certified, and might not have FFC certs.
> Huawei used to have a couple of slides.
> I looked on some other list and found the following:
> We considered EPON, and there are some inexpensive solutions from off shore
> that are worth considering.
> In the end, we went for GPON for two reasons:
> 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.
> Two we like our current vendor, Adtran, and we wanted to put OLT cards into
> the same chassis and manage them using the same systems. The cost premium
> versus a new vendor for EPON wasn't huge. The CPE is the bigger cost, and
> we didn't see a real cost difference between EPON ONT and GPON ONT.
> In the end, the price difference for GPON versus EPON wasn't great - and
> while GPON is a bit "designed by committee" and there are some valid
> criticisms there, they're academic in light of the other factors.
> On Tue, Jan 5, 2016 at 3:00 PM, <nanog-isp at mail.com> wrote:
> > Hello all,
> > For those of you with optical last mile networks that are familiar with
> > both GPON and GEPON, would you mind sharing experiences of the
> > between GPON and GEPON, especially from an operative perspective?
> > For arguments sake let's assume bitrate, split ratio, cross vendor
> > compatibility and purchase price differences aren't of major interest.
> > Thanks,
> > Jared
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