This object specifies the of maximum data
rate at which the station may transmit data.
The octet contains a value representing a rate.
The rate should be within the range from '2' to
'127', corresponding to data rates in increments
of 500 kb/s from 1 Mb/s to 63.5 Mb/s. It should
be one of the rates in the IEEE802dot11-MIB
dot11OperationalRateSet. The default value is
'127'.