[Soekris] Ubiquity 400mW mini-PCI

[spoggle]

I think the power supplies you're using are inadequate.

Having suffered through having to go through 3 months of chasing ghosts and
then having to replace 500 power supplies in the field, always use 1.5 - 2
times the power you calculate as worst possible case. Underpowering these
boards will cause you grief, the symptoms we found were spontaneous reboots
and poor performance of the radio. As I mentioned before, I would not
consider trying one of these radios in a 48xx series with less than a 20W
(as measured at the Soekris board, important to remember with PoE!)
available. The 45xx series docs say they take 7W, and I'd go for at least
22-24W @ the connector.

Also, 400mW radios, IMO, are a bit like sledgehammers - RF is like driving
on ice, and a more powerful engine is going to make adequate performance
worse, and nothing will make a car perform like it would on clean dry
asphalt. If you have problems with 100 or 200mW radios, you really should
seek the advice of an expert. Brute force, as you've noticed does not
necessarily solve the problem.

dave c

On 10/7/05, Matt Buford <matt at overloaded.net> wrote:
>
> I have a point to point link using these cards with a 4801 running in
> master
> mode (power supply 31311210) on one side and a 4521 (power supply 31954804
> PoE) on the other side. As far as I can tell they seem to get enough
> power.
>
> This was an upgrade from running senao 200mw cards in the same system.
> Strangely, the signal does not seem to be notably better. I do not have
> line of sight and actually bounce my signal off a 30+ story residential
> building. In both cases it works ok most of the time but is prone to "bad
> days" where the signal seems to fade. During that time large packets get
> dropped while smaller packets tend to make it through. I had hoped the
> 400mw card would help me power through whatever noise was causing the
> issue
> but it doesn't seem to have change much.
>
> I had moderate stability problems of the 4521 end all along. After
> upgrading to the 400mw card, that system became even more unstable and
> then
> one day mysteriously wouldn't boot at all and just scrolled a LILO error
> nonstop. I ended up replacing the 4521 with another identical board I had
> lying around and this made it boot right up and all stability problems
> were
> gone.
>
> I suspect that specific 4521 board has been marginally bad all along,
> which
> would explain the stability issues I was never able to iron out. However,
> to be honest I have not had time to further play with the questionable
> board
> to try to figure out what is really going on.
>
> ----- Original Message -----
> From: "Iwan Kilis" <iwan at kawanuanetworks.com>
> To: <soekris-tech at lists.soekris.com>
> Sent: Thursday, October 06, 2005 1:48 AM
> Subject: [Soekris] Ubiquity 400mW mini-PCI
>
>
> > Hi All,
> >
> > I am new to this forum, and been looking for some answer about what
> > Soekris board can support Ubiquity 400mW mini-PCI Cards.
> >
> > I've been using net4511 and net4521 as my wlan base, now i have 6 AP
> > running on 4521 and around 30 dedicated wireless client using 4511.
> >
> > For next installation i would like to use 400mW mini-pci from ubiquity
> > networks.
> >
> > I have read on th web (by googling) that net 4526 (dual mini-PCI) is
> > recomended, but is net 4511 can be used too ?
> >
> > how about implementation using 802.11b 200mW pcmcia and 400mW Mini-PCI
> on
> > one 4511 board, is it possible ?
> >
> > Thanks for any answer,
> > PS: sorry for my bad english, it's not my native language :)
> >
> > Iwan Kilis
> > Kawanua Networks ISP
> > http://www.kawanuanet.net.id
> >
> > _______________________________________________
> > Soekris-tech mailing list
> > Soekris-tech at lists.soekris.com
> > http://lists.soekris.com/mailman/listinfo/soekris-tech
> >
>
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>
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