Lots of good reasons to derate. Manufacturers have been known to fudge max ratings or bury airflow and altitude issues in a foot note. For any continuous duty use I am with Ken on this.
Sent from my iPhone > On Dec 12, 2018, at 5:49 PM, Ken Hohhof <[email protected]> wrote: > > I like to size power supplies around 2x actual radio current draw, to allow > for inrush current when everything gets powered up at once. > > From: AF <[email protected]> On Behalf Of Mathew Howard > Sent: Wednesday, December 12, 2018 6:15 PM > To: AFMUG <[email protected]> > Subject: Re: [AFMUG] Packetflux noob > > I imagine it would probably be fine, since that's max load, and not what it's > typically going to be using, but 120 watts on a 120 watt power supply is a > bit closer than I'd want things to be. > > I assume your using a rack injector, which if I remember correctly, lets you > use any power input on any of the ports (regardless of what card they're on), > so why not use all three power supplies? > > On Wed, Dec 12, 2018 at 2:24 PM Ryan Ray <[email protected]> wrote: > Would like to tag on this, I've sent this off to packeflux support as well > but maybe the crowd can tell me if this is good. > > I would like to power the following. > > 1 – PMP450i (5ghz) > 2 – PMP450m (5ghz) > 1 – PTP820S (18ghz) > 1 – Mimosa B24 (24ghz) > > > I’ve got two “Cambium Sync for 450i / 450m” boards. I’ve also got three 48v > 2.5A 120w,c8 power supplies. > > Can I plug in two of the 48v 2.5A power supplies, then configure > > Card 1 – 1st power supply – pmp450m, pmp450i, mimosa b24 > Card 2 – 2nd power supply – pmp450m, PTP820s > > PMP450m – 70W typical, 80W peak > PMP450i – 15W typical, 25W max > PTP820S – 35W > Mimosa B24 – 19.5W max > > So looking at the power supply, it can do 120w > > If I do the way I want we would be looking at 120W for the first power supply > and then 105W for card two. > > Would this be enough power do you think? Seems like I'm right up against the > limits trying to power everything with two power supplies. -48v isn't an > option at this site. > > Just want to make sure I’m not doing anything strange or out of the ordinary > here. > > On Wed, Oct 3, 2018 at 4:50 PM Mathew Howard <[email protected]> wrote: > That's kind of surprising that an old 450 AP ran for a couple of days on 48v > before it died... I would've expected it to die right away. > > It would be very nice if everything would just run on either voltage... the > ePMP 1000 GPS radios do, and an AF5x does (unless it's one of the very first > ones to ship... then it's 24v only), but I think that's about all that does. > Pretty much anything that does Gigabit PoE will take either polarity, so that > at least simplifies things a little bit (but using the wrong PoE pinout can > screw up sync over power... so there's that). > > On Wed, Oct 3, 2018 at 11:06 AM Ken Hohhof <[email protected]> wrote: > There are lots of choices. > For DIN rail, I keep the Traco 360W units in stock, use them with or without > the BMU depending on whether it’s an AC or DC site. > For non DIN rail, I keep Mean Well 150W and 300W HRP series in stock. > Most stuff is going to 48V, so I’m building DC sites as 48V now. Small > DC-DC for 24V if needed, more and more not needed. > And of course whenever we say 48V, the equipment needs to actually accept up > to at least 60V. > > It’s starting to drive me crazy when I want to add a sector at a site and > realize the existing sectors are 24V but the new one will have to be 48V. > The RackInjectors and PowerInjectors handle this nicely, but it’s a recipe > for disaster and a source of confusion. I’ve already fried a 450 AP at a > tower with mixed vintage equipment, because I thought it was a 450i and I > powered it with 48V. It ran for a couple days and then died. > > Techs keep questioning me when I say an AF5x or a Nanostation ac takes 24V. > I understand the confusion, you don’t expect 24V on a Gigabit POE. What > would really make sense is if equipment would accept either voltage, and > either polarity. OK, not possible with high current draw radios like a > Medusa or an AF11, but it would be nice on a Nanostation. > > > From: AF <[email protected]> On Behalf Of Forrest Christian (List > Account) > Sent: Wednesday, October 3, 2018 10:28 AM > To: AnimalFarm Microwave Users Group <[email protected]> > Subject: Re: [AFMUG] Packetflux noob > > I have the new 3.65 medusa on my mind.... plus I'm a bit tired. > > The 48V 2.5A power supplies will run 2 non 3.65 medusa radios each. If you > jumper the boards so 2 radios run off of each power supply you'll be fine > (the AF24 is a similar quantity of power). > > But, a bulk supply is probably a better idea if you can find one in your > right form factor. > > > > On Wed, Oct 3, 2018 at 8:07 AM Eric Muehleisen <[email protected]> wrote: > I've been using CTM2's for nearly a decade, but they do not support 450m. > CMM5 is waaay to expensive for what it does and is clunky. I've been looking > at Packetflux's RackInjector's. > > I'm not familiar with PacketFlux products and need clarity on something. See > attached. I need to power (3) 450m AP's and a(1) AF24. I also need physical > spares for each unit. Is the attached parts list correct or am I missing > something? > > Thanks! > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > Forrest Christian CEO, PacketFlux Technologies, Inc. > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > [email protected] | http://www.packetflux.com > <image001.jpg> <image001.jpg> <image001.jpg> > <image002.jpg><image002.jpg><image002.jpg> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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