cd11IfPhyMacSpecification 1.3.6.1.4.1.9.9.272.1.1.2.1.1.6

This object specifies which IEEE 802.11 Standard applies to this radio interface. ieee802dot11a(1) - IEEE 802.11a Standard, ieee802dot11b(2) - IEEE 802.11b Standard, ieee802dot11g(3) - IEEE 802.11g Standard.