We could add splitters or fixed attenuators at the ont end. It could be done at the NID or the drop termination closure.
That’s just inconvenient due to all the site visits. It’s easy to attenuate at the OLT also, but it would affect every customer on the port equally. I’d want to attenuate selectively. Oh geez I wonder if Nokia has a setting to just dial back the tx on the ONT. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: AF <af-boun...@af.afmug.com> on behalf of Bill Prince <part15...@gmail.com> Sent: Wednesday, July 12, 2023 6:58:49 PM To: af@af.afmug.com <af@af.afmug.com> Subject: Re: [AFMUG] "Low pass" attenuator What if you just feed it into a splitter? a 32-way split will knock off a bunch of dBs. bp <part15sbs{at}gmail{dot}com> On 7/12/2023 2:11 PM, castarritt wrote: So overload is -14db where the other one is -7, but is rx sensitivity also ~7db higher? if it is, just pop a ~7db attenuator into it and all the weaker ONTs will still connect just fine. On Wed, Jul 12, 2023 at 3:31 PM <dmmoff...@gmail.com<mailto:dmmoff...@gmail.com>> wrote: In my imagination I picture something with microsecond response time that only affects the signal from the stronger ONT. If signal is stronger than -15 then reduce it by 5dB. Maybe some kind of opto-electronic switch that directs light through two equal length paths. One path has the attenuator, and the signals from the strong ONT take that path and recombine with the unattenuated path afterwards. I suppose it doesn’t exist and would cost a million dollars if it did. We’ll see if the vendor can fix the sensitivity issue, and otherwise we’ll just not buy that unit. -Adam From: ch...@go-mtc.com<mailto:ch...@go-mtc.com> <ch...@go-mtc.com<mailto:ch...@go-mtc.com>> Sent: Tuesday, July 11, 2023 1:01 PM To: dmmoff...@gmail.com<mailto:dmmoff...@gmail.com>; 'AnimalFarm Microwave Users Group' <af@af.afmug.com<mailto:af@af.afmug.com>> Subject: Re: [AFMUG] "Low pass" attenuator The real hot ones are just a time slice I presume so you would have to take the attenuator in and out of the circuit synched on the ont transmit schedule. Pads on hot ONTs seem to be the only solution to me. From: dmmoff...@gmail.com<mailto:dmmoff...@gmail.com> Sent: Tuesday, July 11, 2023 10:16 AM To: 'AnimalFarm Microwave Users Group' Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com> Subject: RE: [AFMUG] "Low pass" attenuator Exactly. We were testing a different brand of XGS-PON transceiver. It works fine, except clients stronger than about -14 don’t connect. Our current brand alarms at -10, but functions as high as -7, so our design assumes -10 as a cutoff. We can go around and pad the hot ONT’s, but it would be super convenient if we could magically add 5dB to only the real hot ones. …. we could just not use the transceiver, but it’s a lot cheaper than what the OLT manufacturer is selling us so it would be nice to make it work. -Adam From: AF <af-boun...@af.afmug.com<mailto:af-boun...@af.afmug.com>> On Behalf Of Chuck McCown via AF Sent: Tuesday, July 11, 2023 11:01 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com<mailto:af@af.afmug.com>> Cc: ch...@go-mtc.com<mailto:ch...@go-mtc.com> Subject: Re: [AFMUG] “Low pass” attenuator Curious, where would you have two signals of different amplitude in a fiber system? PON return signals? From: Adam Moffett Sent: Tuesday, July 11, 2023 5:07 AM To: AnimalFarm Microwave Users Group Subject: [AFMUG] “Low pass” attenuator Is there such a thing as a fiber attenuator that only attenuates a signal higher than some threshold? I’m thinking to prevent overloading a receiver, but let weaker signals pass unimpeded. Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ -- AF mailing list AF@af.afmug.com<mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list AF@af.afmug.com<mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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