This setting controls the type of Wi-Fi devices (802.11a/b/g/n/ac) that can connect to the AP. So it has the same interference issues that Wireless B has. If configured for 11n mode only, legacy devices that support only 11a/b/g aren't able to connect to the AP. 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. Okay, to start with 802.11 is the actual name of the group who developed WiFi. The 802.11n standard can increase your wireless network's performance, reliability, and predictability. 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. 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. 5 Wireless Wifi 802.11 a, b, g, n, ac, ad, ah, aj, ax, ay Router Range and Distance Comparison. And that slows everything down. Wireless G is backward compatiblewith Wireless B devices. For optimal performance and compatibility, enable support for all wireless modes. 2.4 GHz Wi-Fi channel frequencies. Like Wireless B, it operates at the unregulated 2.4GHz frequency range. 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. It offers backward compatibility to 802.11b/g/n as well. Wireless G supports a maximum theoretical transfer rate of 54mbps. Wireless AC is the newest generation of WiFi and it supports simultaneous connections on both the 2.4 GHz and 5 HGz frequencies. It supports up to 1300 Mbps on the 5 GHz band and up to 450 Mbps on the 2.4 GHz band. 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. Now in 2019 WiFi 6 or 802.11 ax is on the horizon. If you do, then you can check if your smartphone shows both bands under WiFi settings. That is even more practical if the unit or system has a QOS function provided. Smartphones use as much bandwidth as 200 legacy devices and are placing increasing demands on wireless A, B, G, and N networks. The 802.11g standard used the same OFDM technology introduced with 802.11a. Wireless AC has an even greater coverage area and a stronger signal. Like 802.11a, it supported a maximum theoretical rate of 54 Mbps. 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. 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