Type "show ap association client-mac <mac address>" to see what that client's capabilities are:
(192.168.1.3) #show ap association client-mac 04:db:56:2c:6e:f9
The phy column shows client's operational capabilities for current association
Flags: A: Active, B: Band Steerable, H: Hotspot(802.11u) client, K: 802.11K client, R: 802.11R client, W: WMM client, w: 802.11w client V: 802.11v BSS trans capable
PHY Details: HT : High throughput; 20: 20MHz; 40: 40MHz
VHT : Very High throughput; 80: 80MHz; 160: 160MHz; 80p80: 80MHz + 80MHz
<n>ss: <n> spatial streams
Association Table
-----------------
Name bssid mac auth assoc aid l-int essid vlan-id tunnel-id phy assoc. time num assoc Flags Band steer moves (T/S)
---- ----- --- ---- ----- --- ----- ----- ------- --------- --- ----------- --------- ----- ----------------------
Kitchen-135 d8:c7:c8:40:10:d1 04:db:56:2c:6e:f9 y y 1 20 ACME-TLS 1 0x10018 a-HT-20sgi-1ss 1m:14s 1 WKAB 0/0
This device only supports a single spatial stream, so the maximum is 72 megs
a-HT-20sgi-1ss