February 13, 2018
This is a comprehensive article: 10 Tips To Fix – WiFi Connected But No Internet Access
|2.4 Ghz||20 Mhz||Auto||802.11g/n This ensures that pre-2009 adapters (like the one in the ground floor) can receive 2.4 Ghz signals.|
|5 Ghz||40 Mhz||149||802.11ac/n|
If you use 802.11n with 20MHz channels, channels 1, 5, 6, and 11 – I think best is to set to auto
MODES OF 802.11
My router has FIVE modes: 802.11 a/ac/b/g/n.
a and b were released in 1999, g in 2003, n in 2009, and ac in 2013 (ac builds on n).
a/ac/n use the 5 GHz band. b/g/n use 2.4 GHz band. Thus n is common to both.
BE AWARE THAT OLD ADAPTERS CANNOT RECEIVE n. SO YOU NEED TO SET UP APPROPRIATE LEGACY MIXTURE
BANDWIDTH: The wider the channel, the more you can get out of it. For maximum range, use 20 MHz, for maximum bandwidth use 80 MHz channels. i.e. 2.4 Ghz has a lower max speed but provides more distance whereas the 5 Ghz has higher max speeds but covers less distance.
CHANNEL: This is not a great article, but tolerable starting point How to Boost Your Wi-Fi Speed by Choosing the Right Channel (