I'll bet the people who would know about this would be the HFT guys.
On 9/9/21 10:04 AM, Chuck McCown via AF wrote:
Yeah, I wonder how tight the timing is? I also wonder what kind of
packets come out of the photo detectors. If you could take the raw
baseband data and directly modulate it without any layer 234 type of
stuff, you might be able to replicate it. Essentially photon to rf
then back to photon.
*From:* Ryan Ray
*Sent:* Thursday, September 9, 2021 10:33 AM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] extending Calix GPON via RF
I'd have to imagine the timing would get considerably screwed up and
you'd end up with rogue ONT errors constantly.
On Thu, Sep 9, 2021 at 9:23 AM Chuck McCown via AF <af@af.afmug.com>
wrote:
Not saying you could convey a full gpon traffic load. But if you
could just have a few ONTs stretched out there via RF it would be
very handy. It seems pretty simple as a block diagram. Just a
pair of the ONT SFPs and then convert that to ethernet. As long
as the timing was tight enough I think it would work. Have to
make sure to limit the rate on the ONT to not be able to swamp the
channel. Not sure if that is done in the ONT or not on GPON
system. If not an external switch with rate limiting would have
to be used.
I would guess there is too much latency to keep the system happy.
Pretty sure the ONT transmit timing is some kind of polling system
and probably expects microsecond response times. That would have
to be spoofed probably . I wonder if the ONT receiving is
essentially a tagging scheme with no sync issues to worry about.
*From:* Adam Moffett
*Sent:* Wednesday, September 8, 2021 8:41 PM
*To:* af@af.afmug.com
*Subject:* Re: [AFMUG] extending Calix GPON via RF
Is it even possible? How wide is an optical channel? They space
them 20nm apart, and that's gonna be around 2ghz of spacing
between channels. That doesn't mean the channel is 2ghz wide, but
it might be "up to" that big and you'd need that full duplex. I
mean RFOG puts a whole cable TV system on one wave right? So if
they're not a full 2ghz channel they're still pretty big. What
radio band would give you a pair of ginormous channels like that?
On 9/8/2021 4:57 PM, Carl Peterson wrote:
I've looked but never found such a beast. i would love this,
even for a few hundred meters. Look into an E3 GPON. Easier than
a full cabinet
On Wed, Sep 8, 2021 at 2:10 PM Chuck McCown via AF
<af@af.afmug.com> wrote:
I am sure this has been discussed before but not finding it.
I need to extend service to a small cluster of new homes
being built. About 18 homes.
Too far to get there with fiber right now. Maybe in a few
years.
So I want to extend my system up to them. Will take a
repeater. So need to probably haul a gig up there on point
to point.
I would prefer to be able to serve these customers with Calix
GPON. I could put an E2 system up there and feed it with
ethernet. But it seems someone has come up with a way to
extend an actual OLT/OIM type of signal via RF and put it
back on the fiber such that the ONU thinks it is talking back
to my E7-20 shelf at my C.O.
Does any of this sound familiar?
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