Darn FCC site... expires links way too quickly. The SM pictures look like they MIGHT have one.
On Thu, Jan 21, 2016 at 9:15 AM, Forrest Christian (List Account) < li...@packetflux.com> wrote: > I remember hearing the same thing, which is why I went looking at the > photos. See > https://apps.fcc.gov/eas/GetApplicationAttachment.html?id=2053606 > > There aren't any that I can see, even under the cans. I thought that > perhaps looking at the actual board would reveal some, but I sure don't see > any. On the SM perhaps? > > On Thu, Jan 21, 2016 at 9:08 AM, Adam Moffett <dmmoff...@gmail.com> wrote: > >> They have said there's a resistive heater. I heard it in ePMP training >> in Albany and I've seen it stated on this list. >> >> If I remember correctly (I might not), they wanted the CPU to hit a >> certain temp before starting up. If it was too cold you'd see a delay in >> startup of up to 2 minutes while waiting for this heater to bring the CPU >> up to temp. I've never actually observed the delay, so I guess they're >> talking about Alaska cold, not NY cold. >> >> >> On 1/21/2016 10:47 AM, Forrest Christian (List Account) wrote: >> >> I looked at the high resolution photos on the FCC site and didn't see >> anything obvious. Now I've got the one I have on the bench out of the >> case, I still don't see anything obvious heater-wise, but again I'm not >> going to pop the shields off the board (requiring desoldering), to be 100% >> sure... >> >> On Thu, Jan 21, 2016 at 8:30 AM, Steve D <bigd...@gmail.com> wrote: >> >>> Just throwing this out there, but don't the epmp's have a small heater >>> in them that could be turning on when it's cold, drawing additional power? >>> I recall it was supposed to pre-heat components to avoid freezeup on first >>> boot but I can't recall if that's the only time they run or not. >>> >>> -Steve D >>> >>> On Thu, Jan 21, 2016 at 1:44 AM, Forrest Christian (List Account) < >>> li...@packetflux.com> wrote: >>> >>>> I do want to clarify one item: >>>> >>>> This is not necessarily related to the cambium DRAM issue. I don't >>>> want to claim that problem, since this isn't the same thing. This is more >>>> of an issue where you have ePMP's which seem to start having power-related >>>> issues. If moving to a 30V brick makes your problem go away, then the >>>> issue I describe below probably is your issue. If moving to a higher >>>> voltage doesn't fix the issue then this probably doesn't relate to your >>>> issue. Regardless, it is my intent to recommend that my customers move to >>>> 48V as soon as I confirm that this seems to fix at least a decent number of >>>> the problems without causing others. >>>> >>>> Unfortunately this might be a case of the cold weather aggravating two >>>> separate issues (or for that matter, the cold weather causing increased >>>> current consumption in the ePMP, which then requires a higher voltage to >>>> operate correctly). >>>> >>>> -forrest >>>> >>>> On Thu, Jan 21, 2016 at 12:43 AM, Forrest Christian (List Account) < >>>> <li...@packetflux.com>li...@packetflux.com> wrote: >>>> >>>>> A bit of an update from the PacketFlux side. >>>>> >>>>> Late this afternoon I received a ticket from Tyson in relation to >>>>> these issues. In particular, sync from a PacketFlux SyncInjector dropping >>>>> off on an ePMP when it's cold. I have spent a bit of time this evening >>>>> investigating this issue. The following is a summary of what I found. >>>>> It's a bit long-winded so that those experiencing the problems can >>>>> understand my current working theory and help me figure out if this is the >>>>> case. >>>>> >>>>> WARNING: The following is based on a limited amount of testing with a >>>>> single ePMP with no traffic and no clients and on a bench. This is >>>>> likely >>>>> the best case scenario. The field is only going to be worse. >>>>> >>>>> The setup is as follows: >>>>> >>>>> ePMP 1000 GPS AP, with no GPS hockey puck attached, connected to a >>>>> Gigabit Syncinjector (Rev H and Rev I - I have a special one with a port >>>>> of >>>>> each 'type' ;-) ). I am powering the injector with a variable power >>>>> supply so I can vary the voltages in. The AP is connected to the Injector >>>>> with ~100m of CAT5 cable. The Antenna connectors have terminators on >>>>> them, the AP is in transmit mode, but isn't passing any traffic since >>>>> there >>>>> are no clients. >>>>> >>>>> When feeding the injector with 24V, I get about 23V at the AP. This >>>>> is pretty consistent with what I would expect in this situation. The AP >>>>> seems to work fine, at least on the bench and without doing any real >>>>> work. However, as the voltage drops, things start to get weird: >>>>> >>>>> At around 22V in, (21V at the AP), Sync becomes flaky. This is >>>>> consistent on both H and I version ports on the injector. Sometimes it >>>>> works, sometimes it doesn't. Note that 22V is the bottom of the rated >>>>> voltage inputs for the ePMP. >>>>> >>>>> At around 20.5V in (19.5V at the AP), the radio just turns off. It >>>>> won't turn back on until around 22V. >>>>> >>>>> Now here's where some total speculation comes to play. On the bench, >>>>> this unit is drawing around 3W. Let's assume that under load, and when >>>>> temperatures are cold, this unit draws closer to 6W. This would double >>>>> the >>>>> current, and quadruple the voltage drop. Now, assume 24V in, this puts >>>>> you >>>>> at around 20V in at the AP, which is about the turnoff point. Remember >>>>> this is on 100m of wire, and a total speculation about a the power draw of >>>>> a cold, under load AP. But the point is valid, regardless of the cause - >>>>> if the circuit resistance when combined with the power load causes a low >>>>> enough voltage at the AP, weird things will happen. And since weird >>>>> things >>>>> seem to start to happen around 22V, there just isn't much headroom at >>>>> 24V. >>>>> >>>>> This explains why things work well at 30V. >>>>> >>>>> For those who are having this problem I'd recommend trying increasing >>>>> the voltage into the SyncInjector. The Revision H injectors can safely >>>>> handle up to around 56V or so. Assuming all of the radios on an injector >>>>> are either ePMP or the newer 450i's, using 56V into a SyncInjector is >>>>> perfectly acceptable and the ePMP's are rated up to 56V as well. >>>>> >>>>> So the summary: Try a 48VDC voltage source instead of 24V and see >>>>> what happens. >>>>> >>>>> -forrest >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> On Wed, Jan 20, 2016 at 11:00 AM, Tyson Burris @ Internet >>>>> Communications Inc < <t...@franklinisp.net>t...@franklinisp.net> wrote: >>>>> >>>>>> Hello Cambium, >>>>>> >>>>>> >>>>>> >>>>>> At the MidWest-IX launch party last night, several of us Indiana >>>>>> WISPs compared notes on the ‘cold weather’ problems we are seeing with >>>>>> ePMPs. It was very interesting to learn we are experience identical >>>>>> problems across the spectrum. >>>>>> >>>>>> We all understand this is a DRAM issue with certain units you have >>>>>> identified. We also understand the firmware RC that has been made >>>>>> available to fix this short term. >>>>>> >>>>>> The bottom line is we are very frustrated and grow tired of dealing >>>>>> with it. >>>>>> >>>>>> >>>>>> >>>>>> Our concern is simple. If your software fix ‘degrades’ the >>>>>> performance of the product or triggers other issues, as it has been >>>>>> suggested, we would prefer a full recall and replacement program >>>>>> immediately. >>>>>> >>>>>> >>>>>> >>>>>> If the suggestion that the fix will degrade the product performance >>>>>> is inaccurate and not cause other issues, I would like for this to be >>>>>> made >>>>>> public. >>>>>> >>>>>> >>>>>> >>>>>> Thank you, >>>>>> >>>>>> >>>>>> >>>>>> *Tyson Burris, President* >>>>>> *Internet Communications Inc.* >>>>>> *739 Commerce Dr.* >>>>>> *Franklin, IN 46131* >>>>>> >>>>>> *317-738-0320 <317-738-0320> Daytime #* >>>>>> *317-412-1540 <317-412-1540> Cell/Direct #* >>>>>> *Online: * <http://www.surfici.net>*www.surfici.net >>>>>> <http://www.surfici.net>* >>>>>> >>>>>> >>>>>> >>>>>> [image: ICI] >>>>>> >>>>>> *What can ICI do for you?* >>>>>> >>>>>> >>>>>> *Broadband Wireless - PtP/PtMP Solutions - WiMax - Mesh Wifi/Hotzones >>>>>> - IP Security - Fiber - Tower - Infrastructure.* >>>>>> >>>>>> *CONFIDENTIALITY NOTICE: This e-mail is intended for the* >>>>>> *addressee shown. It contains information that is* >>>>>> *confidential and protected from disclosure. Any review,* >>>>>> *dissemination or use of this transmission or its contents by* >>>>>> *unauthorized organizations or individuals is strictly* >>>>>> *prohibited.* >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>>>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>>>> <forre...@imach.com>forre...@imach.com | http://www.packetflux.com >>>>> <http://www.linkedin.com/in/fwchristian> >>>>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>>>> >>>>> >>>> >>>> >>>> -- >>>> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >>>> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >>>> <forre...@imach.com>forre...@imach.com | http://www.packetflux.com >>>> <http://www.linkedin.com/in/fwchristian> >>>> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >>>> >>>> >>> >> >> >> -- >> *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* >> Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 >> <forre...@imach.com>forre...@imach.com | <http://www.packetflux.com/> >> http://www.packetflux.com >> <http://www.linkedin.com/in/fwchristian> >> <http://facebook.com/packetflux> <http://twitter.com/@packetflux> >> >> >> > > > -- > *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* > Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 > forre...@imach.com | http://www.packetflux.com > <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> > <http://twitter.com/@packetflux> > > -- *Forrest Christian* *CEO**, PacketFlux Technologies, Inc.* Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 forre...@imach.com | http://www.packetflux.com <http://www.linkedin.com/in/fwchristian> <http://facebook.com/packetflux> <http://twitter.com/@packetflux>
