This table represents the transmit and receive MCS
supported by the PLCP and PMD, represented by a count
from 0 to 127, subject to limitations of each
individual PHY.
Entries in this table are created automatically
by the agent corresponding to each 802.11n
compliant interface.
There exists in this table, an entry corresponding
to each entry in dot11PhyOperationTable where
dot11PHYType equals 'ht'(7).