DWL900AP+ H/W C2 F/W 3.02 heat problem

[Kanyaraj Babu]

Nice one James. Too bad D-link tech support couldn't think of it. I came
to the overheat conclusion because I compared the DWL900AP+ with my old
DWL900AP which power cycles correctly in seconds. For the DWL900AP+ the
time to discharge is definitely more than a couple of minutes but hey,
if that is the design, I can live with it!

~Kan    

-----Original Message-----
From: Jim Carter [mailto:jimc at math.ucla.edu] 
Sent: Friday, February 20, 2004 11:16 PM
To: Kanyaraj Babu
Cc: wireless at lists.samba.org
Subject: Re: DWL900AP+ H/W C2 F/W 3.02 heat problem

On Fri, 20 Feb 2004, Kanyaraj Babu wrote:

> I recently purchased a couple of DWL900AP+ H/W c2 F/W 3.02 and I
observe
> the units hang repeatedly even in room temperature. To reproduce my
> problem, I have them powered on and after 10 of minutes the units warm
> up. I connect using the Airplus Manager Utility and just hit "Apply"
-->
> prompted for password and "OK"  then the LAN interface stops
responding
> to pings (lights up though) and the WLAN Indicator goes off. I have to
> wait for a couple of minutes before the unit cools down and I can
access
> again (immediate power recycle won't work)....

I don't have any experience with this hardware, but it doesn't sound
like 
temperature to me.  

1.  It's boreal winter.  Stick an extension cord out the window; take
the
AP, a hub and a laptop outside and try the test.  (In AU or NZ, do this
before sunrise when outside air should be noticeably cold.)  I'll bet it
fails equally.

2.  On my Agere Orinoco access point, when I hit "apply" the thing
reboots
itself, which shuts off all interfaces for about 60 seconds.  You may be
seeing a difference in reboot speed between the old vs. new hardware or
firmware versions.

3.  When power cycling, did you wait fully 10 seconds before turning it
on 
again?  A cheap IPO detector is a simple capacitor hooked to a gate
input 
and fed from +5V through a largish resistor.  If the capacitor is 
discharged, power has just come on, so it thinks.  But after a momentary

power loss the capacitor will still be charged, and the firmware will
omit 
essential initialization.

Hope one of these is helpful!

James F. Carter          Voice 310 825 2897    FAX 310 206 6673
UCLA-Mathnet;  6115 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA
90095-1555
Email: jimc at math.ucla.edu    http://www.math.ucla.edu/~jimc (q.v. for
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