Ur Airport Express Technology Overview (sid 14):
Interference robustness
Wireless interference can come from a variety of sources, including other wireless net-
works, cordless phones, baby monitors, and wireless video distribution systems.When
there is interference, some data packets may not reach their destination.These “lost”
packets are automatically retransmitted, so no data is actually lost. Unless the need
for resends is great enough to noticeably slow down data transfer, users are often
unaware that there has been a problem. However, sometimes interference can be so
severe that wireless clients actually lose their connection.
A feature called interference robustness is designed to maintain a wireless connection
between an AirPort Express Base Station and an AirPort Extreme client or Wi-Fi–enabled
Windows client in the face of severe wireless interference.This feature must be enabled
on both the base station and the client computer.
Note that interference robustness provides a stronger connection between the client
and base station, but may reduce the overall range of the wireless network.
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http://ls.berkeley.edu/mail/magnet/2004/0408.html