D-Link AirPro DWL-AB520 Multimode Wireless PCI Adapter:The DWL-AB520 enables IT managers to plan for future network growth or to immediately expand their wireless network infrastructure when available wireless channels have already been tapped out. The additional high-bandwidth channels available with 802.11a also offer users on the network a robust way to transmit large data files much quicker than what was possible with 802.11b. Network administrators have the option of overlaying an 802.11a network on top of an existing 802.11b network, essentially creating another wireless network of 802.11a users who can communicate discreetly with one another. The DWL-AB520 is IEEE 802.11a and 802.11b compliant and interoperable with other 802.11a and 802.11b compliant devices.