what are beacons ??

[Pavel Roskin]

Hello!

> sorry for that stupid question, but what are BEACONS ?

First hit on Google for "what are 802.11 beacons":
http://www.80211-planet.com/tutorials/article.php/1492071

> and:
> - what means "beacon interval (1 = 1024 usec)"
> - how long is 1 usec ?

1 usec is one microsecond.  If you set beacon interval to 1, it will be
sent with the interval 1024 microseconds, or 1.024 milliseconds.  Normally
about 10 beacons per second is OK, that would be beacon interval 100, or
0.1024 seconds.

-- 
Regards,
Pavel Roskin