For optimal performance and compatibility, enable support for all wireless modes. But like 802.11b, it operated in the crowded 2.4 GHz frequency (and thus was subject to the same interference issues as 802.11b). Prepare your network to support the influx of new mobile devices. So it has the same interference issues that Wireless B has. And that slows everything down. These days, however, the 5GHz band is vital to any newer Wi-Fi product, and 802.11a can be used as a fallback for newer standards if necessary. Wi-Fi routers often use two bands to provide dual band Wi-Fi, the 2.4GHz band is one of the primary bands and it is most commonly used with the 5GHz Wi-Fi band. This setting controls the type of Wi-Fi devices (802.11a/b/g/n/ac) that can connect to the AP. The table given below provides the frequencies for the total of fourteen 802.11 Wi-Fi channels that are available around the globe. WiFi6 4T4R Dual Bands Selectable mPCIe Card IEEE802.11ax / ac / a / b / g / n 2.4G / 5GHz MT7915 AW7915-NP1 $ 60.00 $ 35.00 Quantity price please make an offer below AW7915-NP1 is a 4T4R 2401 Mbps WiFi6 11ax Mini PCIe Module, Dual Bands selectable is configurable. Smartphones use as much bandwidth as 200 legacy devices and are placing increasing demands on wireless A, B, G, and N networks. Wireless AC has an even greater coverage area and a stronger signal. Now in 2019 WiFi 6 or 802.11 ax is on the horizon. The 802.11n standard can increase your wireless network's performance, reliability, and predictability. If configured for 11n mode only, legacy devices that support only 11a/b/g aren't able to connect to the AP. It offers backward compatibility to 802.11b/g/n as well. That is even more practical if the unit or system has a QOS function provided. Wireless G is backward compatiblewith Wireless B devices. Coexistence with 802.11 a/b/g/n: For an 80 MHz 802.11ac channel to properly coexist with older 20 MHz radios operating within the channel, there is a 'request to send' and 'clear to send' exchange before each real message is sent. If you do, then you can check if your smartphone shows both bands under WiFi settings. Okay, to start with 802.11 is the actual name of the group who developed WiFi. Like Wireless B, it operates at the unregulated 2.4GHz frequency range. Like 802.11a, it supported a maximum theoretical rate of 54 Mbps. Both heavy duty single band commercial AP’s and Tri-Band home units, can do an admirable job at supporting more devices, without paying more for internet. Wireless G supports a maximum theoretical transfer rate of 54mbps. If it doesn’t, your phone will simply use the older WiFi IEEE 802.11 b/g/n which transmits on 2.4 GHz frequency in which case speeds will also be slower. 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