Hi James, On Tue, Dec 12, 2006 at 08:25:29PM +1100, James Cameron wrote: > G'day, > > I've three BTest-1 units, running olpc193_A54.zip from Mitch. I did a > quick test this afternoon using a WOAP54G access point mounted on a step > ladder on a remote farm. The access point antenna was 2m above the > ground. > > I carried one unit (QUOZL 1) on a walk. I only tried three positions: > 200m, 500m, and 900m away. Operating position was ears up, with me > standing up. I'm 186cm or so tall. The terrain is lightly undulating, > as can be seen in the photographs. I made sure I could see the step > ladder.
Great testing! Keep up the good work. > I was able to get perfect operation at the first two positions. Beyond > 400m the presence of vegetation between the laptop and the access point > began to matter. At the 900m position, the network name was selectable > on the user interface, but association did not succeed. We've got a problem here: association error code is not properly reported down to the user... > I don't believe anything significant can be drawn from these results at > this stage, because I don't have a baseline to compare them against, and > the access point is an unknown. > > Brief pictures ... > > http://quozl.linux.org.au/olpc/2006-12-12/ > > (The start of the test was an ssh client connected to mpg123, playing a > long music podcast so I'd enjoy the test more, while pinging at one > second intervals. The ssh stream involved a lot of buffering, so it > wasn't a useful indication. The ping was most useful. Later after > losing association and regaining it, I tested with flood ping, which is > very useful for displaying the effect of buffered retransmitted packets > ... the line of dots grows on loss, and recedes on gain.) > > Things I'm yet to do ... > > - try the other two units, to normalise the test, > > - monitor received signal strength on laptop (is this available > anywhere?), You can switch to a terminal and run "iwconfig" for that. > - monitor received signal strength on access point (OpenWrt, already > know how to do this), > > - map signal strength by GPS coordinates, seating position, laptop > antenna deployment mode, EBook configuration, > > - map throughput, > > - test ad-hoc mode (waiting for availability). _______________________________________________ Devel mailing list [email protected] http://mailman.laptop.org/mailman/listinfo/devel
