Sounds like a cool device. Excited to see the finished project. On Mon, Mar 21, 2016 at 9:04 PM, Chuck McCown <[email protected]> wrote:
> It is the mixed rail that seems to be the interesting part. I have been > asked multiple times. > > *From:* George Skorup <[email protected]> > *Sent:* Monday, March 21, 2016 8:50 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Fuse question > > In all honesty, we won't ever use it. Remote power control per > device/radio via one PacketFlux device or another is what we do everywhere. > > I'm sure someone will use it, so don't take my narrow-minded opinion to > heart. > > I do have one question about the APC cards. Would it be possible to flip > the RJ45s around so that the tab faces away from the board? That is > probably the only complaint I have with them. > > On 3/21/2016 9:36 PM, Chuck McCown wrote: > > Yes, it is an alternate form factor. > May as well spill the beans. > > Something Gino asked for a couple of years ago but never found the > solution until recently. > > I have a 24 position rack mount, same size as the 4 position DIN I sell > now. > I am putting a power back plane in it. It will have 4 separate isolated > power buses. > > Couldn’t find the power bus connectors I wanted until lately. > Actually they were available but only in bulk. They recently packaged > them so my pick n place machine could put them on the board. > > So you can mix 4 different POE voltages in each rack. A/B powering. > Two common point powering connectors in the back. Diode combiner. > You only need one if you only have one source of power. > > Mix –48 and +48 and 24 and 12 all in the same rack. > No wires going to each individual GIGE-POE-APC. > > The surge suppressor will be the GIGE-POE-PRM > > *From:* Jeremy <[email protected]> > *Sent:* Monday, March 21, 2016 7:07 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Fuse question > > I am perfectly happy with the GIGE-POE-APC the way it is now. I haven't > lost one in three years. Is this finding a solution to a problem that > doesn't exist? > > On Mon, Mar 21, 2016 at 7:01 PM, Chuck McCown < <[email protected]> > [email protected]> wrote: > >> It is also a POE inserter. >> >> *From:* George Skorup <[email protected]> >> *Sent:* Monday, March 21, 2016 4:40 PM >> *To:* <[email protected]>[email protected] >> *Subject:* Re: [AFMUG] Fuse question >> >> Let a surge suppressor be a surge suppressor. I will handle the >> over-current externally (fuses, PacketFlux electronic, etc). >> >> On 3/21/2016 3:37 PM, Chuck McCown wrote: >> >> Yeah, I am coming to that conclusion I think. >> >> *From:* Forrest Christian (List Account) <[email protected]> >> *Sent:* Monday, March 21, 2016 2:32 PM >> *To:* af <[email protected]> >> *Subject:* Re: [AFMUG] Fuse question >> >> >> You need to look at the curve on the polyfuse. Because the trip is >> related to heating which is related to current it will trip much faster in >> many circumstances. ... however the trip current varies widely with >> ambient temperature as well. >> >> I'm not convinced that you can actually find a polyfuse which will >> protect Ethernet magnetics. >> On Mar 21, 2016 4:14 PM, "Chuck McCown" < <[email protected]> >> [email protected]> wrote: >> >>> The poe card would not be the cause, it would be the victim. The AP or >>> wiring would be the cause. >>> >>> The polyfuse I am looking at takes 12 seconds to blow. Trying to >>> protect the power supply and other loads in parallel. >>> Not sure if that is fast enough to be of great value. >>> >>> If one AP shorts out, you don’t want it taking down others that are off >>> the same power supply. >>> >>> *From:* Josh Luthman <[email protected]> >>> *Sent:* Monday, March 21, 2016 2:07 PM >>> *To:* <[email protected]>[email protected] >>> *Subject:* Re: [AFMUG] Fuse question >>> >>> >>> Meh just replace the card if it's being troublesome. >>> >>> Josh Luthman >>> Office: 937-552-2340 >>> Direct: 937-552-2343 >>> 1100 Wayne St >>> Suite 1337 >>> Troy, OH 45373 >>> On Mar 21, 2016 4:05 PM, "Chuck McCown" < <[email protected]> >>> [email protected]> wrote: >>> >>>> Well, they have their downside. >>>> A real fuse will be easier to notice when it is blown. >>>> A poly fuse just cuts the current way down. >>>> More of a troubleshooting issue than anything else. >>>> >>>> But, if a fuse is blown, then you have to fix the circuit and find a >>>> replacement fuse. >>>> I do have LEDs and by unplugging the short circuit cable the LED should >>>> come back to full brightness. >>>> >>>> Just thinking out loud here. Want to make the right choice. >>>> >>>> *From:* Josh Luthman <[email protected]> >>>> *Sent:* Monday, March 21, 2016 2:02 PM >>>> *To:* <[email protected]>[email protected] >>>> *Subject:* Re: [AFMUG] Fuse question >>>> >>>> Cheaper to run a polyfuse...why bother asking??? >>>> >>>> >>>> Josh Luthman >>>> Office: 937-552-2340 >>>> Direct: 937-552-2343 >>>> 1100 Wayne St >>>> Suite 1337 >>>> Troy, OH 45373 >>>> >>>> On Mon, Mar 21, 2016 at 4:01 PM, Chuck McCown < <[email protected]> >>>> [email protected]> wrote: >>>> >>>>> Still leaning toward the polyfuse. Not a lot of room, fuses and fuse >>>>> holders are more money. >>>>> >>>>> *From:* Bill Prince <[email protected]> >>>>> *Sent:* Monday, March 21, 2016 1:51 PM >>>>> *To:* <[email protected]>[email protected] >>>>> *Subject:* Re: [AFMUG] Fuse question >>>>> >>>>> Most of ours are now the DIN-mounted double feed that uses the 5x20mm >>>>> glass fuses. However, we also have a few legacy sites that use the >>>>> automotive blade fuses. >>>>> >>>>> If something new came along, we would use what it uses. >>>>> >>>>> bp >>>>> <part15sbs{at}gmail{dot}com> >>>>> >>>>> >>>>> On 3/21/2016 12:47 PM, Josh Luthman wrote: >>>>> >>>>> We already stock 5x20mm fuses so keeping with the same form factor >>>>> would be nice. Anyone else using those same DIN clip fuse holders have >>>>> the >>>>> same. >>>>> >>>>> >>>>> Josh Luthman >>>>> Office: 937-552-2340 >>>>> Direct: 937-552-2343 >>>>> 1100 Wayne St >>>>> Suite 1337 >>>>> Troy, OH 45373 >>>>> >>>>> On Mon, Mar 21, 2016 at 3:40 PM, Adam Moffett < <[email protected]> >>>>> [email protected]> wrote: >>>>> >>>>>> I have no strong opinions sir, but if it's a replaceable fuse I do >>>>>> like the automotive blades because every gas station has them. >>>>>> >>>>>> >>>>>> >>>>>> On 3/21/2016 2:42 PM, Chuck McCown wrote: >>>>>> >>>>>> I am considering adding a fuse to a new version of my rack mount POE >>>>>> surge suppressors. >>>>>> >>>>>> I know many of you like PTC resettable solid state fuses. I don’t >>>>>> recall ever designing one in to anything. >>>>>> Maybe I did on a phone device years ago, but that would have been to >>>>>> satisfy a regulatory agency only. >>>>>> >>>>>> Studying up on them I learn that if you have a 1 amp “hold current” >>>>>> the “always trip” current is 2 amps. >>>>>> Not like a fuse, which is pretty well guaranteed to trip at any >>>>>> current over the rating if you wait long enough. >>>>>> >>>>>> For a polyfuse, if your load is one amp, you have to have a design >>>>>> value of greater than 1 amp hold current. >>>>>> But then it takes double that to actually trip.. >>>>>> >>>>>> And then there is leakage current required to keep it in the tripped >>>>>> condition. >>>>>> It does not totally break the circuit. >>>>>> >>>>>> They are fairly inexpensive compared to glass fuses and fuse >>>>>> holders. >>>>>> Could do auto blade fuses too. >>>>>> >>>>>> Not sure I have the room for anything but a polyfuse though. >>>>>> >>>>>> Anyone have strong opinions about this? >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> >>>> >>> >> > > >
