Does it just need to filter 1310/1490 so the OTDR doesn't see it and then you can shoot 1550?
On Wed, Apr 19, 2023 at 3:58 PM <ch...@go-mtc.com> wrote: > Just a lump in a fiber jumper with connectors on each end. Would take > some digging to find it. > > > > *From:* Josh Luthman > *Sent:* Wednesday, April 19, 2023 1:40 PM > *To:* ch...@go-mtc.com > *Cc:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] OTDR transmit power > > Got a picture at least? > > On Wed, Apr 19, 2023 at 3:35 PM <ch...@go-mtc.com> wrote: > >> I tried to find a link, we have one, but I don’t know where I got it. >> Perhaps a custom fiber filter from fs.com >> >> >> >> *From:* Josh Luthman >> *Sent:* Wednesday, April 19, 2023 1:23 PM >> *To:* AnimalFarm Microwave Users Group >> *Cc:* ch...@go-mtc.com >> *Subject:* Re: [AFMUG] OTDR transmit power >> >> That's clever! Nice tip, thanks. >> >> On Wed, Apr 19, 2023 at 3:15 PM Chuck McCown via AF <af@af.afmug.com> >> wrote: >> >>> There is a band pass filter you can add for shooting over live fiber. >>> >>> >>> >>> *From:* Josh Luthman >>> *Sent:* Wednesday, April 19, 2023 11:27 AM >>> *To:* AnimalFarm Microwave Users Group >>> *Subject:* Re: [AFMUG] OTDR transmit power >>> >>> On Calix optics they say it's OK if the OTDR hits it with 1650. I don't >>> think an OTDR will shoot if it sees 1310/1490. >>> >>> On Wed, Apr 19, 2023 at 1:03 PM <dmmoff...@gmail.com> wrote: >>> >>>> Oh I 100% believe they could do it. If I knew tx power of the OTDR it >>>> would be easy to estimate how close they’d have to be to exceed the >>>> overload threshold of the transceiver. >>>> >>>> “Dynamic Range” has to be a diff between Tx and sensitivity …..or so I >>>> would assume. If it is then I could guess that maybe half the range is >>>> from Tx and half from Rx? So a 50dB range might mean +25Tx? I mean that >>>> all seems plausible to me, but it’s a lot of assuming. I just wish this >>>> number was on the spec sheet. >>>> >>>> >>>> >>>> The alleged location of the case they were in was over 200,000 ft >>>> away. A ZR is a bit sensitive, but that OTDR would have to be pretty damn >>>> strong to nuke it from that distance. Maybe it is that strong, or maybe >>>> they’re lying to me. So a second part of the equation is whether I trust >>>> what this crew tells me in the future. With same guys we had a link we >>>> were troubleshooting suddenly come up 20 minutes after they were “hands >>>> off”. So I already think they might be compulsive bullshitters. >>>> >>>> >>>> >>>> >>>> >>>> *From:* AF <af-boun...@af.afmug.com> *On Behalf Of *Chuck McCown via AF >>>> *Sent:* Wednesday, April 19, 2023 11:57 AM >>>> *To:* AnimalFarm Microwave Users Group <af@af.afmug.com> >>>> *Cc:* ch...@go-mtc.com >>>> *Subject:* Re: [AFMUG] OTDR transmit power >>>> >>>> >>>> >>>> These guys think so: >>>> >>>> https://content.jwplatform.com/previews/IQitGvAV >>>> >>>> >>>> >>>> Best Regards, >>>> Chuck McCown >>>> >>>> McCown Technology Corporation >>>> 8401 N Commerce Dr >>>> Lake Point, Utah 84074 >>>> 801-250-9503 Office >>>> 435-830-4306 Cell >>>> www.mccowntech.com >>>> www.microtrench.pro >>>> www.terabitnetworks.com >>>> >>>> >>>> >>>> *From:* dmmoff...@gmail.com >>>> >>>> *Sent:* Wednesday, April 19, 2023 9:23 AM >>>> >>>> *To:* 'AnimalFarm Microwave Users Group' >>>> >>>> *Subject:* [AFMUG] OTDR transmit power >>>> >>>> >>>> >>>> Does anyone know how strong the pulses from an OTDR might be? Is there >>>> a rule of thumb to guess that based on the dynamic range? >>>> >>>> >>>> >>>> I’m trying to determine if a dark fiber provider might have blasted a >>>> ZR optic with an OTDR at close range. We know they were out testing >>>> recently, and the manufacturer is saying receiver may have been overloaded >>>> and the link is way too long for the far end transceiver to have done it. >>>> >>>> >>>> >>>> I’m not out to blame anybody, this is just an educational exercise. >>>> ------------------------------ >>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> ------------------------------ >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >>
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