The IEEE 802.11g standard also works with datarates of up to 54 Mbps in the 2.4 GHz ISM frequency band. Unlike IEEE 802.11b, the IEEE 802.11g standard works with OFDM modulation, as used by the earlier standard IEEE 802.11a. IEEE 802.11g features a specialized compatibility mode for backwards compatibility with the widely available IEEE 802.11b standard. However, operating this compatibility mode incurs performance losses. IEEE 802.11g is not compatible to IEEE 802.11a as they operate at different frequencies. IEEE 802.11g products offer similar ranges to IEEE 802.11b products.
The 802.11g standard can also be operated with Turbo Mode, which uses two radio channels in parallel to increase datarates to a maximum of 108 Mbps. Because the 2.4-GHz band has fewer channels to offer than the 5-GHz band, operating Turbo Mode places clear limits on the choice of available channels.