[Denis]

Thanks SQNWK!

I found this expanation:

What are the differences between Wireless B and Wireless G pc cards?
The speed at which you can connect to a wireless network can be greater
with a wireless G pc card; however, wireless B pc cards perform very well in
our wireless environment. Wireless G pc cards are meant for environments
where greater speeds are needed. For email, internet and other web use,
wireless B technology provides all the capabilities you will need as a student,
faculty or staff member.

Please note that we have designed the CCU wireless network to manage that
speed which is allowed through our wireless network, regardless of whether
a wireless B or G card is used. This provides each student the resources they
need without allowing a faster card to “overpower” communications send from
a slightly slower card.

http://www.ccu.edu/technology/wireless/#differences