hw5gRadioVhtNssMapMaxMcs 1.3.6.1.4.1.2011.6.139.11.1.17.1.21

This object indicates the maximum MCS value for 802.11ac radios. The number of spatial flows is 8 and the maximum MCS value is 7-9. The format is x?x?x?x?x?x?x?x. The default value is 9?9?9?9?9?9?9?9.