For the powering, we use a similar solution as Charles suggests. We use a
planet device from www.planet.com.tw for the same purpose. We import them
directly to Europe from Taiwan.
They can be used with a seperate slave unit or without the slave straigth on
to he device. Without the slave, there is more heat development in the
KN100/200. It is slightly more. Our experience is that the real issue is in
the temp off the memory.
We tested a design with plastics and an aluminum heatsink to solve the heat
problem in a passive way. We wanted to have a solution without any fan.
First testing was very promissing. We will do a heat chamber test with a new
board to get the proof. Attached a pdf off the aluminum heatsink (it is
changed slightly for two components). We cool both the processor and the
memory with the heatsink and connect it via the back off the casing to the
outside world. We have a mold for the abs casing. We preferred it in abs as
it was possible to use one casing for indoor (not waterproof) and one for
outdoor waterproof. In both cases we can see the led information which in
our case is used for customer support when using the kn100 as a client unit.
It is also easy on the base stations however less practical.
The first units worked reasonable well in the local situation in the
Netherlands. Temperatures are not very high here though. App. 28-30 deg C
max in the summer.
We tested with poe in a heated box (not as accurate as a heatchamber) till
35 deg C outside temp and the units continued working correctly. It was
tested under full load.
Wim Bos
-----Original Message-----
From: karlnet-bounces@WISPNotes.com
[mailto:karlnet-bounces@WISPNotes.com]On Behalf Of jna@tcpbbs.net
Sent: Thursday, December 18, 2003 3:54 AM
To: Karlnet Mailing List
Subject: Re: [Karlnet] Heat Problems Continued - PoE solution for
problems
Charles this is a link to an alvarion poe device, did not know such a
monster exsisted. Does this work with the 900 cpe? How much are they?
Thanks,
John
> what we have is
>
> http://www.wirelessconnections.net/downloads/techlit/PI-CAT5.pdf
> Part # 872447
> we got em on consignment, that's why they're so cheap...
>
> -Charles
>
> -----Original Message-----
> From: karlnet-bounces@WISPNotes.com
> [mailto:karlnet-bounces@WISPNotes.com]On Behalf Of Norm Young
> Sent: Wednesday, December 17, 2003 10:56 AM
> To: Karlnet Mailing List
> Subject: Re: [Karlnet] Heat Problems Continued - PoE solution for
> problems
>
>
> Are the KN-200s that are shipping now have temperature control on the fan
> header? (I've got a KN-200 with a fan on it now, and to tell the truth,
> the fan doesn't use much power...and haven't had any temp. problems so
> far--with a 14vdc supply. But I'd like to replace it for that odd -10
degree
> day up there, when the last thing that needs to be happening is more
> circulation!) What about this problem with PoE heat? Is this fixed? I'm
> looking at a new WIPOP that needs to be PoE.
>
> Norm
>
> ----- Original Message -----
> From: "Charles Chia Sheng Wu" <cwu@cwlab.net>
> To: "Karlnet Mailing List" <karlnet@WISPNotes.com>
> Sent: Tuesday, December 16, 2003 8:56 PM
> Subject: RE: [Karlnet] Heat Problems Continued - PoE solution for problems
>
>
> > Hi,
> >
> > We have a PoE injector/regulator solution that bypasses the ethernet
port
> > completely
> > By putting a voltage regulator at the top (and having user adjustable
> > setting to 5v, 9v, & 12v on our PoE solution), we're able to avoid many
of
> > the heat problems (basically, board is powered via the power jack, and
we
> > haven't seen any lockup issues w/ it)
> > best thing is price...it's $25 / set, and that includes power supply for
> 100
> > m, and voltage regulator splitter w/ 2 power ends (so you can also power
> an
> > amp, or power 2 boards up top)
> >
> > Offlist for more info
> >
> > -Charles
> >
> > -------------------------------------------
> > KarlNet Preferred Channel Partner
> > Ask us about our CPE leasing solutions...
> > 773.667.4585x334 (o)
> > 773.457.0718 (m)
> > 773.632.0571 (f)
> >
> >
> > -----Original Message-----
> > From: karlnet-bounces@WISPNotes.com
> > [mailto:karlnet-bounces@WISPNotes.com]On Behalf Of Bryan
> > Sent: Tuesday, December 16, 2003 10:35 PM
> > To: Karlnet Mailing List
> > Subject: Re: [Karlnet] Heat Problems Continued
> >
> >
> > I'm preparing to buy these - if the temps you reported are in
> > farenheight, they won't work for me....
> > If in celsius I'll be ok.
> > For my info, since I've not purchased yet & don't know what they report
> > in, is that F or C ?
> >
> > Bryan
> >
> > Michael McDermott wrote:
> >
> > >
> > > I'm aware the KN-100 boards could/do have possible heat problems, but
> > > apparently "the heat issue is resolved".
> > >
> > > Yesterday, a customer reported that 5 of his KN-100 boards failed due
> > > to heat. Yesterday the temperature had only reached 35 degrees.
> > >
> > > 4 of the units were equipped with senao 200mw cards (with heat sinks)
> > > in Demarc outdoor enclosures. Ethernet cable lengths were 10-15 meters
> > > and 12V1A power supplies where used. Also the customer was using
> > > latest revision of the firmware (4.44).
> > >
> > > 1 of the units was equipped with a 30mw (Orinoco) card in Demarc
> > > outdoor enclosure, Ethernet cable length was 10-15 meters and 12V1A
> > > power supply. This one also failed in this heat.
> > >
> > > All of these units failed with an on board temperature of about 59
> > > degrees, but the customer also reported that the some of other units
> > > did not fail had on board temperatures of 64 degrees. Why do some
> > > units fail with an on board temperature at around 59 degrees and
> > > others do not?
> > >
> > > This customer is pro-active as he is using lower voltage power
> > > supplies and has applied heat sinks to the cards. What else can we do
> > > to solve this problem without the use of fans?
> > >
> > > What is Karlnet doing to resolve these problems?
> > >
> > > Thanks.
> > >
> > > Michael R McDermott BEng (Comp. Eng.), MACS, IEEE
> > > Pre-Sales Technical Consultant
> > > Veritech Australia Pty Ltd
> > > _______________________________________________
> > > Karlnet mailing list
> > > Karlnet@WISPNotes.com
> > > http://lists.wispnotes.com/mailman/listinfo/karlnet
> >
> >
> > _______________________________________________
> > Karlnet mailing list
> > Karlnet@WISPNotes.com
> > http://lists.wispnotes.com/mailman/listinfo/karlnet
> >
> > _______________________________________________
> > Karlnet mailing list
> > Karlnet@WISPNotes.com
> > http://lists.wispnotes.com/mailman/listinfo/karlnet
>
>
> _______________________________________________
> Karlnet mailing list
> Karlnet@WISPNotes.com
> http://lists.wispnotes.com/mailman/listinfo/karlnet
>
> _______________________________________________
> Karlnet mailing list
> Karlnet@WISPNotes.com
> http://lists.wispnotes.com/mailman/listinfo/karlnet
>
_______________________________________________
Karlnet mailing list
Karlnet@WISPNotes.com
http://lists.wispnotes.com/mailman/listinfo/karlnet
_______________________________________________
Karlnet mailing list
Karlnet@WISPNotes.com
http://lists.wispnotes.com/mailman/listinfo/karlnet
|