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Broadcom 125HSM/Afterburner
Broadcom has a series of Wireless Access Points that use a technology called 125 High Speed Mode (HSM) and/or AfterBurner. This technology allows a Wireless Access Point to provide faster speeds than 54 Mbps that the standard 802.11 g provides. According to Broadcom, it is backwards compatible with any 802.11 g wireless card.Tests have shown this to not be the case with the Fujitsu T4220 Tablets. If you are having problems with your wireless and are trying to connect to an access point that utilizes either 125HSM or AfterBurner, disable that feature on the access point and connect using just 802.11 g.
To learn more about this technology, see http://en.wikipedia.org/wiki/Afterburner_(wireless_networking).