What about (Ce | Ceee | eC | eCee | eeCe | eeeC ) ???
eC mean Extend Channel below : 20Mhz?
eCee mean Extend Extend Channel below : 40Mhz?
eeCe mean Extend Channel below : 80Mhz?
eeeC mean Extend Channel below : 160Mhz?
and why Ce and Ceee but there is no Cee ?
Each letter denotes a 20MHz channel section.
C: is where the Channel's main frequency is set
e: is where the rest of the spectrum "sub-channel" is distributed
There is no "Cee" because that would equal 3x20MHz combined channels to make a 60Mhz channel, Mikrotik currently only has 20/40/80 channel width available for AC.
If the antenna is has 2 spatial streams (dual-chain) then you will see 2x 80Mhz, not 2x160Mhz, equaling the equivalent of 866Mbps link speed. Single chain (1 spatial stream) = 433Mpbs link speed.
Hope this helps!