i dont recall if these have the heater in them like the other epmp. winter is going to be problem
I dont understand letting customers do things outside the demarc. I voiced my opinion and got over ruled, so time will tell. A fiber media converter would be the bees knees, solve a bunch of issues. but why make sense when we can cobblefuck, right? On Wed, Sep 1, 2021 at 10:48 AM Chuck McCown via AF <af@af.afmug.com> wrote: > The POE inserter is indoors only rated. If you wanted to make sure the > radio has full voltage you would want to put this device out by the radio. > > I fully agree with you, put the cambium PSU as far down the line as you > can. > > You are probably using at least 4 if not all 8 wires for the POE. So you > have 4 wires down and 4 wires back. That is 1/4the the voltage drop. If > you have one down, with 10 volts drop, then another 10 volts for the return > wire. You gotta calculate full loop length not just one way for the loop > resistance. > > 800’ loop has 20 volts of overall drop at .5 amp. But 4 of them in > parallel has 10 ohms with 5 volts drop. > > *From:* Steve Jones > *Sent:* Wednesday, September 1, 2021 9:16 AM > *To:* AnimalFarm Microwave Users Group > *Subject:* [AFMUG] resistivity of cat5 > > I have a customer fixed on using > https://i.mt.lv/cdn/product_files/GPeRqg_190928.pdf to extend his epmp > f300 radio run to 400+ feet. > if im calculating this right there will be about a 10v drop on the 24guage > cat5, taking the 30v down to 20. If it does manage to keep the radio > powered i see it burning out the poe circuit. > > hes fighting me on putting the cambium PSU at the midspan point and using > his own POE to power the extender. > > Ive been overruled about telling the customer no, so its happening, but I > want to make sure my math is correct > using https://www.rapidtables.com/calc/wire/voltage-drop-calculator.html > 24guage, 30v, .5 amp, 400 feet shows 10v drop. but im not sure about the > resistivity field > > this is a guy who runs constant latency monitoring and initiates tickets > on every blip, so i see this radio move just becoming a nightmare with this > midspan extender in play > > ------------------------------ > -- > 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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