IEEE 802.11a-1999 or 802.11a was an amendment to the IEEE 802.11 wireless local network specifications that defined requirements for an orthogonal frequency-division multiplexing communication system.
D-Link wireless Cardbus adaptor from the mid-2000s. Unlike many others from its era, this model supported 802.11a (5 GHz) in addition to the more common 802.11b and 802.11g.