Note – Below , the bolded 20 is the frequency the radio is set to.
Normal 20 MHz wide is C
C = 20 MHz wide
( Total is 20 MHz wide — 20 )
Ce ;
C = the center 20-MHz wide frequency the radio is set to
e = an additional 20-MHz wide frequency that starts above where C stops.
( Total is 40 MHz wide — 20 + 20 )
Ceee ;
C = the center 20-MHz wide frequency the radio is set to
e = an additional 20-MHz wide frequency that starts above where C stops
e = an additional 20-MHz wide frequency that starts above where e above stops
e = an additional 20-MHz wide frequency that starts above where e above stops
( Total is 80 MHz wide — 20 + 20 + 20 + 20 )
eC ;
e = an additional 20-MHz wide frequency that starts lower than where C begins.
C = the center 20-MHz wide frequency the radio is set to
( Total is 40 MHz wide — 20 + 20 )
eeeC ;
e = an additional 20-MHz wide frequency that starts lower than where e below begins.
e = an additional 20-MHz wide frequency that starts lower than where e below begins.
e = an additional 20-MHz wide frequency that starts lower than where C begins.
C = the center 20-MHz wide frequency the radio is set to
( Total is 80 MHz wide — 20 + 20 + 20 + 20 )
eCee ;
e = an additional 20-MHz wide frequency that starts lower than where C begins.
C = the center 20-MHz wide frequency the radio is set to
e = an additional 20-MHz wide frequency that starts above where C stops
e = an additional 20-MHz wide frequency that starts above where e above stops
( Total is 80 MHz wide — 20 + 20 + 20 + 20 )
Info
If we have a 20 MHz wide channel setting at a frequency of 5500 ,
The frequency use begins at ( 5500 – 10 ) = 5490
The frequency use ends at ( 5500 + 10 ) = 5510
If we have a Ce (40 MHz wide) channel setting at a frequency of 5500 ,
The C frequency use begins at ( 5500 – 10 ) = 5490
The C frequency use ends at ( 5500 + 10 ) = 5510
The e frequency use begins at ( 5500 + 10 ) = 5510
The e frequency use ends at ( 5500 + 10 + 20) = 5530
Of special note:
If you have a eCee configured AP
A eC client should get an eC connection
A Ce client should get a Ce connection
A Ceee client should get a Cee connection
A eeeC client should get a eC connection
A normal C ( 20-MHz ) client should get a ( 20-MHz ) C connection
If I am correct – A XXXX client will auto connect and get the widest possible connection.
A XXXX client connected to a normal 20-MHz C AP should get a 20 MHz wide connection
A XXXX client connected to a Ce or eC AP should get a 40 MHz wide connection
A XXXX client connected to a Ceee or eCee or eeCe or eeeC ap should get a 80 MHz wide connection.
Note – the above connection channel widths are based on good/clean/clear frequencies.
If you have a XXXX client or a Ceee clinet -and- a Ceee AP , but the e frequencies busy and congested , you may only get and maintain 20 MHz wide connection.
If the center band C frequency is busy and congested , then no clients might be able to connected ( C busy and all e frequencies quiet ).
So , when you configure a Ce, Ceee, eC or eeeC AP , the C frequency range on your AP is the most important clean frequency to get client connection.