Which 802.11 amendment extends the standard to a maximum bandwidth of 54 Mbps using OFDM in the 2.4 GHz band?

Which 802.11 amendment extends the standard to a maximum bandwidth of 54 Mbps using OFDM in the 2.4 GHz band?

• A. 802.11g
• B. 802.11a
• C. 802.11n
• D. 802.11d

Answer: (A)

OFDM in the 2.4 GHz band is what drove a big speed bump while staying in the same, crowded wireless environment. The amendment that brought this modulation method to 2.4 GHz networks and pushed the peak rate to 54 Mbps is designed to improve efficiency and resilience to multipath in indoor spaces, all while remaining backward compatible with older 802.11b devices. That combination—OFDM, 2.4 GHz operation, and a 54 Mbps ceiling—ties directly to the amendment in question. In comparison, the 802.11a standard uses OFDM as well but operates in the 5 GHz band, not 2.4 GHz. The 802.11n standard goes beyond with MIMO and much higher potential speeds. The 802.11d standard is about regulatory domain information and roaming rules, not data rates or modulation.

OFDM in the 2.4 GHz band is what drove a big speed bump while staying in the same, crowded wireless environment. The amendment that brought this modulation method to 2.4 GHz networks and pushed the peak rate to 54 Mbps is designed to improve efficiency and resilience to multipath in indoor spaces, all while remaining backward compatible with older 802.11b devices. That combination—OFDM, 2.4 GHz operation, and a 54 Mbps ceiling—ties directly to the amendment in question.

In comparison, the 802.11a standard uses OFDM as well but operates in the 5 GHz band, not 2.4 GHz. The 802.11n standard goes beyond with MIMO and much higher potential speeds. The 802.11d standard is about regulatory domain information and roaming rules, not data rates or modulation.