Each side of the line to ground I am guessing. Or both sides to ground.
From: Adam Moffett Sent: Monday, December 23, 2024 3:01 PM To: af@af.afmug.com Subject: Re: [AFMUG] RFT-V 190V Line Power distance I built a spreadsheet based on the formulas in this EETimes article I ran across: https://www.eetimes.com/line-powering-in-the-remote-dslam-world/ Initial results are that 100W at 3000m is possible, with 4x 24ga pairs or 2x 22ga pairs. One thing in that article that made me do a double take was this: How would the above be done? Sounds awesome, but I can't wrap my head around it. Two pairs to two inputs on the device? One pair between the ungrounded terminals on a +190V and -190V power supply? The effective doubling of voltage would let you run that 100W at 3000m with one 24ga pair. -Adam -------------------------------------------------------------------------------- From: AF <af-boun...@af.afmug.com> on behalf of ch...@go-mtc.com <ch...@go-mtc.com> Sent: Monday, December 23, 2024 1:46 PM To: af@af.afmug.com <af@af.afmug.com> Subject: Re: [AFMUG] RFT-V 190V Line Power distance Twisted pair with pvc insulation is good for 300 volts. From: Bill Prince Sent: Monday, December 23, 2024 1:40 PM To: af@af.afmug.com Subject: Re: [AFMUG] RFT-V 190V Line Power distance There has to be some metric other than just watts. 190 volts at ~~ 1/2 amp gets you your 100 watts, but so does 190 amps at a 1/2 volt. More volts means you can use smaller diameter wire, but more volts means you need more insulation. bp <part15sbs{at}gmail{dot}com>On 12/23/2024 10:20 AM, Adam Moffett wrote: I'm looking at strand mounted OLT's. One of the powering options is RFT-V which is a nominal 190VDC over twisted pair. I have 0% familiarity with it. I found a white paper from Commscope saying that the max is 100W, and at 3000 meters your 100W becomes 60W effective power due to voltage drop. Is that a fair rule of thumb? Hey Chuck, didn't you have an excel calculator for this? -------------------------------------------------------------------------------- -- 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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