The downstream to the ONT is a constant stream. It contains the timing and
gating info for polling the upstream. So, yeah, upstream would be tricky.
From: fiber...@mail.com
Sent: Friday, September 10, 2021 3:03 AM
To: af@af.afmug.com
Subject: Re: [AFMUG] extending Calix GPON via RF
GPON ONU optics use burst mode for data transmission. GPON OLTs use burst mode
clock and data recovery to recover the signal. Just wondering how you would go
about transmitting that over Ethernet?
- Jared
Sent: Thursday, September 09, 2021
From: "Chuck McCown via AF" <af@af.afmug.com>
To: af@af.afmug.com
Cc: "Chuck McCown" <ch...@go-mtc.com>
Subject: Re: [AFMUG] extending Calix GPON via RF
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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Carl Peterson
PORT NETWORKS
401 E Pratt St, Ste 2553
Baltimore, MD 21202
(410) 637-3707
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