Thanks for the tip, but the command `iwconfig wlan1 power off` does not
help on my system.

I figured out how to visualize the network pauses by printing dots to
the terminal in a background process while connecting to a remote system
via ssh and asking it to count.  See attachment for details.  If you
remove blank lines and turn off word wrap, it shows a very clear pattern
of two pauses about 7 seconds part, repeating every 119.5 seconds.  The
pauses vary from about 2 to15 seconds each.  (The 'local' system is
using Atheros AR5418 wireless (ath9k) connected to a Linsys AP via
802.11g using WPA/WPA2.  The 'remote' system and the AP are connected
via CAT5.)

** Attachment added: "WiFi pause test"
   http://launchpadlibrarian.net/37142050/WiFi%20pause%20test.txt

-- 
ath9k disassociates/reassociates a lot
https://bugs.launchpad.net/bugs/414560
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