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
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 cabinetOn 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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