This object represents the level of protection to be
provided to the data transmissions of 802.11n radios.
The semantics are as follows.
'pureHt' - No protection will be provided to the
high throughput tranmissions in the BSS started on
this interface. This indicates that there will
only be those high-throughput devices associated to
the AP in the respective BSS.
'optionalProtection' - Protection is optional
considering that there could be legacy devices in the
control and extension channels.
'mandatoryFortyProtection' - Protection is mandatory
for all the 40MHz channel transmissions.
'mandatoryAllProtection' - There are legacy devices
in the BSS and hence all high throughput transmissions
are mandatorily protected.