How on Earth can a WiFi channel be changed by a line parameter?
My understanding again ........
The "line parameter" does not set the wifi channel (you are correct in that statement).
The line parameter switches the auto channel selection feature on or off, if "on" the router then decides the router's channel automatically (no matter what the router wifi channel selection is). If "off" the user can then decide his/her router channel "as normal".
If enabled the router decide on the best wifi channel (for better or worse), regardless of the router's manual channel selection.
The "line parameter" is controlled by TalkTalk. It is a feature enabler, not strictly the feature itself.
EDIT - FWIW - I have just found this quote in a thread from a TT OCE regarding disabling this feature.
"However our Products Team have advised if you are experiencing issues and would prefer to select your own wireless channels then we can arrange for Wi-Fi optimisation technology to be switched off on your line."
Note - On your line !!
Edited by iefbr14 (Sun 03-Jan-21 14:25:59)