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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