The GPS synced radios won't boot at 20v, but the subscriber modules should be able to run at a bit lower voltage (unless the 2.4ghz radios are different, which is possible). With a standard 29v ePMP power supply, there certainly shouldn't be anywhere near that much voltage drop on 100' of cable anyway (unless that cable is complete junk).
The thing that seems really odd to me about that, is that an ePMP normally should be drawing quite a bit less current than a PMP100 (which means less voltage drop). I'm not sure what the minimum voltage is with a PMP100, but I know they can have problems at 12v, so I can't see it being much lower than an ePMP SM. On Sun, May 6, 2018 at 9:01 AM, Josh Luthman <[email protected]> wrote: > They don't boot at 20v. I don't think you'd lose 4v at 100' but I could > be wrong. > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > Suite 1337 > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > Troy, OH 45373 > <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> > > On Sat, May 5, 2018 at 4:30 PM, Philip Rankin <[email protected]> > wrote: > >> I am changing a PMP 100. That is 2.4 GHz over to an EPM P1000 >> subscriber module and the PMP 100 works perfectly with the standard PMP 100 >> power supply or I can even switch it over to the EPMP1000 standard supply >> and it will work. But if I put the EPMP 1000 on it own supply that comes >> with it or the standard PMP 100 supply the radio never shows power. I have >> tested the cable for continuity and is OK. I have to think that the cable >> is resistive and the Voltage is too low at the EPMP1000. I have not checked >> that yet. The cable length is right at 100 feet. Strange! The EPMP1000 >> works fine on a 6’ jumper to the PS. >> >> Phil Rankin >> Wireless Telecommunications Corp. >> Pittsburg, KS >> >> On Wed, May 2, 2018 at 1:56 PM Josh Luthman <[email protected]> >> wrote: >> >>> Right pretty sure Chuck removed the ethernet issues with the newer >>> revision cards. My issue, though, is the units will lose power for >>> anywhere from a moment (so they simply power cycle) to 30 minutes. >>> >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> Suite 1337 >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> Troy, OH 45373 >>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>> >>> On Wed, May 2, 2018 at 12:38 PM, George Skorup <[email protected] >>> > wrote: >>> >>>> I'm running some 1k GPS radios from RSD-150C-24's which always put out >>>> 24.0VDC. Injectors all at the bottom, 100-200 feet of cable and they work >>>> fine. >>>> >>>> The only real problem I've had is getting them to maintain gigabit >>>> links without errors. They'll either run fine with 50-100 CRC/FCS errors a >>>> day. Or I'll get lots more FCS errors and the links will drop a couple >>>> times a day. Some of them will eventually fall back to 100Mbps. Take the >>>> GigE-APCs out and they run gigabit with no errors. >>>> >>>> Chuck sent me some modified CAT6-APCs to try. I just haven't had time >>>> to dive into it yet. Hopefully next week when we replace a couple of those >>>> 1k GPS radios with PTP550s. >>>> >>>> On 5/2/2018 11:22 AM, Josh Luthman wrote: >>>> >>>> There is - here are the counters: https://imgur.com/a/FdVP9IF >>>> Note that bb5/6/7 have been losing power frequently too. >>>> >>>> If the voltage is too low, why would they randomly reboot maybe once or >>>> twice a week and then be fine for months at a time? >>>> >>>> The runs are well under 100m. 24vdc feeds the NEMA enclosure, then we >>>> have maybe 25 feet of cat5 to APs. >>>> >>>> I would think it's no more than 1 volt loss from my 24v source to the >>>> AP, but I have not verified this. I know it's 24v at the green terminal >>>> block to the POE injector/Gigabit Sync injector. >>>> >>>> >>>> Josh Luthman >>>> Office: 937-552-2340 >>>> Direct: 937-552-2343 >>>> 1100 Wayne St >>>> <https://maps.google.com/?q=1100+Wayne+St+%0D%0A++++++++++++++Suite+1337+%0D%0A++++++++++++++Troy,+OH+45373&entry=gmail&source=g> >>>> Suite 1337 >>>> <https://maps.google.com/?q=1100+Wayne+St+%0D%0A++++++++++++++Suite+1337+%0D%0A++++++++++++++Troy,+OH+45373&entry=gmail&source=g> >>>> Troy, OH 45373 >>>> <https://maps.google.com/?q=1100+Wayne+St+%0D%0A++++++++++++++Suite+1337+%0D%0A++++++++++++++Troy,+OH+45373&entry=gmail&source=g> >>>> >>>> On Mon, Apr 30, 2018 at 6:00 PM, Forrest Christian (List Account) < >>>> [email protected]> wrote: >>>> >>>>> If you have a base unit attached to these, you should look at the >>>>> event counters on the tripped line in the binary/boolean tab to determine >>>>> if the device is detecting an overcurrent event. If it's seeing an >>>>> overcurrent trip, then yes, check the surge suppressors. >>>>> >>>>> The other item is what has been mentioned, if you have too low of a >>>>> voltage into the PowerInjector, the ePMP's will reboot. This is >>>>> especially true in cold weather since the units seem to draw more even >>>>> after startup. You need around at least 26V on the input of the power >>>>> injector, if not a bit more, for an ePMP to run correctly on a full 100m >>>>> of >>>>> cable. You could probably get away with a bit lower voltage on shorter >>>>> runs. >>>>> >>>>> The 10/100 injector doesn't drop quite as many volts due to it being a >>>>> switch closure instead of a semiconductor junction, so you might be right >>>>> on the edge of what is acceptable. >>>>> >>>>> BTW, too low of voltage will also cause 'trips', as when the voltage >>>>> drops below acceptable ranges for the ePMP, the ePMP power supply circuit >>>>> tries to pull more and more power from the CAT5 cable, eventually causing >>>>> what looks like a brief short circuit just before it shuts down. >>>>> >>>>> On Mon, Apr 30, 2018 at 11:16 AM, Josh Luthman < >>>>> [email protected]> wrote: >>>>> >>>>>> I've got two of these with problems: http://store.packetf >>>>>> lux.com/powerinjector-plus-sync-gigabit-version/ >>>>>> >>>>>> However one of these gives me no problems: http://store.packetf >>>>>> lux.com/sitemonitor-4-channel-gigabit-poe-injector-controller/ >>>>>> >>>>>> I have a 24vdc plant going up the tower. In the box it feeds these >>>>>> three Packetflux units. The 4 channel POE injector has given me 0 >>>>>> problems. >>>>>> >>>>>> I've got Cambium ePMP on the PowerInjector and it has been randomly? >>>>>> rebooting units for several months. Yesterday one of the ports just >>>>>> decided to turn off for 20 minutes and come right back. We've replaced >>>>>> the >>>>>> line & radio to make sure it's the box, but all signs point to it. >>>>>> >>>>>> Has anyone else seen this or am I lucky in getting the only two units >>>>>> with power problems on them? AFAIK sync has been just as reliable as the >>>>>> power through them. >>>>>> >>>>>> Josh Luthman >>>>>> Office: 937-552-2340 >>>>>> Direct: 937-552-2343 >>>>>> 1100 Wayne St >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> >>>>>> <https://maps.google.com/?q=1100+Wayne+St+%0D%0A+++++++++++++++++++++++++++++++++++Suite+1337+%0D%0A+++++++++++++++++++++++++++++++++++Troy,+OH%0D%0A++++++++++++++++++++++++++++++++++++45373&entry=gmail&source=g>Suite >>>>>> 1337 >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> >>>>>> <https://maps.google.com/?q=1100+Wayne+St+%0D%0A+++++++++++++++++++++++++++++++++++Suite+1337+%0D%0A+++++++++++++++++++++++++++++++++++Troy,+OH%0D%0A++++++++++++++++++++++++++++++++++++45373&entry=gmail&source=g>Troy, >>>>>> OH 45373 >>>>>> <https://maps.google.com/?q=1100+Wayne+St+Suite+1337+Troy,+OH+45373&entry=gmail&source=g> >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>>>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>>>> <https://maps.google.com/?q=3577+Countryside+Road,+Helena,+MT+59602&entry=gmail&source=g> >>>>> [email protected] | http://www.packetflux.com >>>>> <http://www.linkedin.com/in/fwchristian> >>>>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>>>> >>>>> >>>> >>>> >>> -- >> Phil >> >> Philip J. Rankin, CEO >> Wireless Telecommunications, Corp. >> A division of; >> Mobilcom Wireless Services >> PO Box 24 >> Pittsburg, KS 66762 >> 620-231-8188 >> > >
