DWL-900AP+, 5v Power over Cat5, Slotted waveguide.

Alastair D'Silva deece at newmillennium.net.au
Thu Dec 26 21:58:55 EST 2002

Hi Lyle,

Looks pretty funky! One thing you'll with running 5V POE to the unit is
that once you start adding a bit of distance on the cat5, you'll have a
significant voltage drop. At MonashHub, we were getting about 3.5V at
the AP, waaaay too low to make it function.

I ended up making up some 5V switchmode regulators (thanks to
Maxim-ic.com for the schematic and sample controllers), which fit within
a 1" diameter piece of heatshrink, and powers the AP fine. We're using
them on 2 900AP+ and a 1000AP, with no problems.

We drive the Aps with modified realtek NICs, with molex connectors added
to feed +12V down the line.

Since you've offered to provide one of your waveguides to the Canberra
Freenet, I'd be happy to make up a couple for your use. If anyone else
wants one, email me or check back on http://canberra.freenet.in-a.us
(I'll update the site when I get back to Canberra on the 4th).

Alastair D'Silva   mob: 0413 485 733
Networking Consultant

> -----Original Message-----
> From: wireless-admin at lists.samba.org 
> [mailto:wireless-admin at lists.samba.org] On Behalf Of Lyle Williams
> Sent: Thursday, 26 December 2002 6:01 PM
> To: wireless at lists.samba.org
> Subject: DWL-900AP+, 5v Power over Cat5, Slotted waveguide.
> I've finished weatherproofing a DWL-900AP+, and it has been 
> mounted on the side of a 8-slot waveguide.  Power (5v) is 
> supplied over unused pairs on the Cat5 ethernet cable.
> A picture (~200kB) is at http://www.qsl.net/vk1xlw/DSCF2198.JPG .
> Currently I'm testing with the waveguide 2m off the ground.  
> If things continue to go well (after a really hot day...), 
> I'll pull my mast down and mount the waveguide at about 6-7 m.
> Lyle Williams
> 26DEC02

More information about the wireless mailing list