IEEE 802.11g standard applies to wireless LANs. It provides for data transmission rates of up to 54 Mbps, usually in excess of 20 Mbps. Considering that 802.11g devices are based on the OFDM encoding protocol, they are more susceptible to noise than 802.11b devices.

Just like the original 802.11 standard that was adapted by IEEE in 1997, the new 802.11g standard also makes use of 2.4 GHz frequency band.

Raw data transmission rate for 802.11g standard is 54 Mbps, or approximately 20 Mbps after adjusting for the protocol overhead. In turbo mode, most IEEE 802.11g devices provide about 45 Mbps data transmission rates. Therefore, IEEE 802.11g is best suited for high speed bridging applications or for large file transfers being made over high speed (100 Mbps or Fiber) LANs.

Considering that 802.11g client devices are limited to a maximum of 125mW output, 802.11g standard based devices are capable of providing the maximum 54Mbps data transmission rates over relatively small distances only -usually for distances no greater than 100 feet or so. As the distance increases beyond 100ft, a 802.11g connection usually falls back to 802.11b data transfer rates. 802.11g devices can be set to operate in dual mode -i.e. in 802.11b and 802.11g modes. They may operate either in 802.11b or in 802.11g mode, but not in a mixed (i.e. not simultaneously in 802.11b and in 802.11g) mode.