The Cisco Aironet 1200 Series Access Point is a single band lightweight or autonomous access point with dual diversity antenna connectors for challenging RF environments. It offers the same versatility, high capacity, security, and enterprise-class features demanded by industrial wireless LAN customers in a single-band 802.11g solution. The modular device provides the flexibility to field upgrade to a dual-band 802.11a/g network by adding a CardBus-based 802.11a upgrade module that can be easily installed into Cisco Aironet 1200 Series access points originally configured for 802.11g. The device is available in either a lightweight version, or as an autonomous version that may be field-upgraded to lightweight operation.