The IEEE 802.11g wireless Ethernet standard was adopted for wireless local area networks (WLANs) operating up to 54 megabits per second (Mbps) in the 2.4 gigahertz (GHz) band. The 802.11g draft standard utilizes existing elements from the original complimentary code keying (CCK)-orthogonal frequency division multiplexing (ODFM) and Packet Binary Convolutional Code (PBCC)-22 proposals. Each of these proposals called for true 802.11a OFDM operation in the 2.4 GHz band as an optional mode to the primary proposed modulation, either CCK-OFDM or PBCC-22. The 802.11g draft standard makes OFDM the mandatory technology, offering 802.11a data rates in the 2.4 GHz band, requires mandatory implementation of 802.11b modes and offers optional modes of CCK-OFDM and PBCC-22. This balanced compromise offers a much clearer bridge between 802.11a and 802.11b, plus is a straightforward means to develop true multi-mode WLAN products.
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