80211n can combine two 20 MHz channels to form an effective bandwidth of 40 MHz. 40 MHz enables higher data transmission rates to be achieved as compared to 20 MHz.
Channel36 operates at 5.180 GHz with each channel offset by 5 MHz, so that Channel 40 operates at 5.200 GHz (20 MHz offset), and so on. The highest-frequency channel (165) operates on 5.825 GHz. Equipment in Japan supports a different set of Wi-Fi channels that run at lower frequencies (4.915 to 5.055 GHz) than the rest of the world. On5 GHz airMAX, we can choose from 10 MHz, 20 MHz, 30 MHz, 40 MHz, 50 MHz, 60 MHz and 80 MHz. On both 2.4 GHz and 5 GHz, choosing narrower channels like 20 MHz offer better SNR levels and due to using less spectrum, are more efficient. 20 MHz channels offers a good balance in WISP deployments, especially using PtMP systems.Description IEEE 802.11n is an amendment to IEEE 802.11-2007 as amended by IEEE 802.11k-2008, IEEE 802.11r-2008, IEEE 802.11y-2008, and IEEE 802.11w-2009, and builds on previous 802.11 standards by adding multiple-input multiple-output (MIMO) and 40 MHz channels to the PHY (physical layer), and frame aggregation to the MAC layer.. MIMO is a technology that uses multiple antennas to coherently. 293 324 340 487 176 112 230 278