Re: Lousy throughput with DPAC Airborne WiFi module

anon42295@xxxxxxxxxxxxxxxx wrote:

Some of the guys at my company are seeing lousy throughput performance
with the DPAC Airborne WiFi module ( WLNB-AN-DP102). It is hooked into
our embedded system with SPI. The rating is for 20MHz SPI frequency,
but we can only get it to talk at 1.5MHz. So that is one problem.

Even worse, when in use with many TCP or UDP packets, the module seems
to buffer data for a long time and then dribble packets out at a
300msec interval rate. The spec says we should be able to sustain
300kbs in one direction and 70kbs in the other... I think we are
getting only a very small fraction of this.

Any ideas on what we should check into or try to do differently?
Anyone else seen this kind of behavior with the DPAC modules? DPAC
Tech's not responsive lately to inquiries. Any insight you smart folks
can lend, we would appreciate! We are open to switching brands if
anyone has seen really good results with another comparable module.

The problems could be on the RF side ...
I've experienced things with WLAN, that were suboptimal
at best. There was this hotel in a town somewhere. It
had multiple WLAN base stations to optimally cover the
rather distributes complex. Somehow the neighbourhood was
into WLAN as well, the different nets were operated
without coordination. So it happend that due to interference
the signal was receiveable in a 60cm grid, on the grid
points only. So every 60cm there was signal in between
there wasn't. When you rotated the notebook 90 degreees,
the signal was gone. Somehow it was susceptible to people
walking or such, meaning the reception on a grid point
was not possible for longer than 2 minutes.

Rene
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