The maximum number of permitted CPEs connecting to the
SU.
The value -1 means to use the default value of maximum
hosts per SU in the HE wireless interface which the SU
connects to and the value is defined in
cwdxHeSuDefaultMaxCpes in the cwdxHeMacExtTable.
The value 0 means no maximum limit.
The default value is -1.
Setting the value will not affect the already connected
CPEs to the SU.