At the same time, Keenetic routers in the 2.4 GHz band with two spatial MIMO 2x2 streams and a channel width of 40 MHz can link up to 300 Mbit/s and actual speed (under ideal conditions) up to 120 Mbit/s. It is impossible to fix the 40 MHz channel width mode in the router, as this is a recommendation of the standard.
Now you might want to even consider 20MHz width on 5GHz just so you have more individual "lanes" that don't interfere with their many neighboring APs. In theory 802.11ac can do dynamic per frame bandwidth so it can still transmit at 40 MHz if it doesn't have 80 MHz of spectrum free. In practice it seems like only high end stuff does this We changed to 40mhz channels and reenabled UNII1 on all APs and the speed issue seems to have disappeared. I think we could probably reenable 80mhz channels but I dont think it will make a huge difference for us in terms of speed as I cap WAN bandwidth at 150mbit and we aren't sending a lot of big files that would necessitate 80mhz wide channels.
Dalam panduan ini kita akan menemukan apa artinya WiFi 20 MHz atau 40 MHz dan cara mengkonfigurasi jaringan nirkabel; Kami akan menemukan bahwa kecepatan maksimum tidak selalu merupakan jalan terbaik menuju koneksi yang stabil.
Bandwidth denotes the range of your broadcasting channel. 20 MHz is considered "standard" bandwidth, but 40 MHz is twice the channel width. Many people propose 40MHz mode in 2.4GHz only for individuals who reside in remote areas. In 40MHz mode, your WiFi uses 2/3 of the entire 2.4GHz band, and you compete for air time with your neighbors' WiFi. . 118 332 401 263 403 472 346 104

what is bandwidth 20mhz 40mhz