Its just bandwidth - how much data can be carried at once. Think about a cargo van and a semi truck both going the same speed down the highway. You generally want to go with 40 MHz channels for client serving in most cases. Wider channels generally work best for wireless bridge applications in areas with very few potential interfering
TheXiaomi Mi 11 Ultra has two internal antennas, therefore, we can achieve a speed of up to 574Mbps in the 2.4GHz band (WiFi 6, 1024QAM and 40MHz of channel width), and we can achieve a speed of up to 2.402Mbps in the 5GHz band (WiFi 6 in 5GHz, 1024QAM, 160MHz channel width). In the case that we use WiFi routers that only support 80MHz of channel width in 5GHz, we can achieve a speed of up to
Tùychọn trong control panel của RouterNếu các thiết bị đang sử dụng như điện thoại, máy tính hay máy tính bảng thuộc đời cũ, thì bạn nên để mặc định là Auto hoặc 20 Mhz. Lý do ở những máy đời cũ, card wireless đa số là 802.11/a/b/g nên nếu chỉnh lên 40Mhz sẽ không nhận.Trường hợp đã biết rõ các thiết bị
Whatis better: 20 or 40 Mhz for WiFi routers? - Quora. Something went wrong.
Lasredes de 2,4Ghz tienen dos opciones: 20MHz (el ancho de banda «normal») y 40MHz (duplicado). Se recomienda encarecidamente que sólo se utilicen canales de 20MHz de ancho, ya que si se utiliza un canal de 40MHz se solapará con otros, provocando una disminución del rendimiento o, en general, problemas.
Forexample, when channels 36 and 40 are bonded into a 40 MHz channel if channel 40 is the primary channel, the operating channel bandwidth is 40 MHz minus; if channel 40 is the primary channel, the operating channel bandwidth is 40 MHz plus. If the 40 MHz bandwidth is configured on the 2.4 GHz frequency band, there is only one non-overlapping Itsupports legacy fallbacks of 11a/11b/11g systems. Bandwidth 20MHz and 40MHz. Data rate -As per 11a/11b/11g. -It supports upto about 72Mbps for 20MHz bandwidth with multiple antennas. -It supports upto about 150Mbps for 40MHz bandwidth with multiple antennas. Distance covered (appox.)- 70m (indoor),250m (outdoor)

spaced12MHz away from ch.13. In 802.11 b/g/n modes, the typical bandwidth requirement per channel is 20MHz and a guard band of 2MHz is added to that. Thus, there is potential overlap in operating frequency range when two transmitters operate in the same airspace. Table 1. IEEE 802.11 channels Channel No. Frequency (MHz) Channel No. Frequency (MHz)

Useof extension channels (e.g. Ce, eC etc) allows additional 20MHz extension channels and if it should be located below or above the control (main) channel. Extension channel allows 802.11n devices to use up to 40MHz (802.11ac up to 80MHz) of spectrum in total thus increasing max throughput. .
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    • which is better bandwidth 20mhz or 40mhz