My standalone R700 will not use MCS 8 or 9 for any clients connected over the 5GHz 80Mhz AC-band. Even when the client is very close to the AP with direct line of sight, the MCS index stays at 7 with a reported Tx rate of 878Mbps. How can I get it to use the higher and faster 256 QAM rates of MCS 8 and 9? The clients, for example Macbook Pros, do support 256 QAM, so that should not be the issue.
Specs:
R700
Firmware 100.1.0.0.432
Macbookpro
OS X El Capitan 10.11.6
Interfaces:
en0:
Card Type: AirPort Extreme (0x14E4, 0x133)
Firmware Version: Broadcom BCM43xx 1.0 (7.21.95.175.1a6)
MAC Address: f4:5c:89:c2:86:25
Locale: FCC
Country Code: US
Supported PHY Modes: 802.11 a/b/g/n/ac
Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 149, 153, 157, 161, 165
Wake On Wireless: Supported
AirDrop: Supported, Channel 149
Status: Connected
Current Network Information:
K-Town R 5G:
PHY Mode: 802.11ac
BSSID: 2c:c5:d3:24:3f:0c
Channel: 149
Country Code: US
Network Type: Infrastructure
Security: WPA2 Personal
Signal / Noise: -38 dBm / -92 dBm
Transmit Rate: 878
MCS Index: 7
