>From what I have read, it is more the pulse duration than output power that is >the hazard. Long pulses for ultra long distance produce more accumulated >power in the SFP photodiode or whatever the element is that receives the >light. Makes sense.
I was totally unaware that a VFD could damage anything but perhaps your eye. From: dmmoff...@gmail.com Sent: Wednesday, April 19, 2023 11:02 AM To: 'AnimalFarm Microwave Users Group' Cc: ch...@go-mtc.com Subject: RE: [AFMUG] OTDR transmit power 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
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