"G"?"> Why "G"? With the availability of affordable 802.11b products and fast 802.11a products (also with data rates up to 54 Mbps), you may wonder why we need yet another wireless networking category anyway. Well, 802.11g is the standard for high-speed networking in the 2.4-GHz bandthe same as the radio spectrum in which 802.11b products operateand hence can deliver speed and backward compatibility.In real-world use, you can expect to achieve maximum throughputs in the range of 18 to 22 Mbps. 802.11a products, meanwhile, provide similar performance but at distances significantly shorter than those at which 802.11g or 802.11b products transmit. That means a business needs to deploy more access points to cover a given area. Its anybodys guess what the arrival of 802.11g products means for the still-new 802.11a universe. In the near future, we expect to see improved performance of 802.11a products, thanks to a second generation of chipsets. Most likely "a"-only products will remain a small portion of the wireless market; and theyll be deployed in environments where there is a high density of clients and maximum throughput is a must. That said, soon equipment makers will start rolling out combination "a/g" cards. These cards will provide connectivity to virtually any IEEE standards-based wireless network, though at a higher cost than single-standard equipment.
802.11g products use the same transmission techniques employed by 802.11a products, which operate in the 5-GHz spectrum. This transmission method, called OFDM (orthogonal frequency division multiplexing) provides eight data rates: 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.