The Cisco Aironet 802.11a/b/g PCI Wireless LAN Client Adapter (PI21AG) is now obsolete (past End-of-Life and End-of-Support status).
End-of-Sale Date: 2013-05-02
End-of-Support Date: 2018-05-31
Cisco's End-of-Life Policy
You can view a listing of available Wireless offerings that best meet your specific needs
If you want support information for the Cisco Aironet 802.11a/b/g PCI Wireless LAN Client Adapter (PI21AG) documentation, it may be available through Cisco.com Search or in the Cisco Community