hpnicfDot11nRadioCfg2ClientDot11nOnlyCM 1.3.6.1.4.1.11.2.14.11.15.2.75.4.8.3.1.12

If radio type is 802.11an or 802.11gn, permit only clients of 11n mode. If radio type is 802.11ac, permit clients of both 11n and 11ac mode.