Wireless Access

I'm having a problem where some devices are connecting on Client PHY: n 20 MHz and running at very slow speeds. Other devices are connecting upon ac 80MHz and receiving much fast connection speeds. Would this be a laptop problem or controller setup issue? Below is what I receive when running the show AP association client-mac.

 

PHY Details: HT : High throughput; 20: 20MHz; 40: 40MHz; t: turbo-rates (256-QAM)
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) phy_cap
---- ----- --- ---- ----- --- ----- ----- ------- --------- --- ----- ------ --------- ----- ---------------------- -------

 Stats
------------------------------------------
Parameter Value
--------- -----
Channel 132
Channel Frame Retry Rate(%) 2
Channel Frame Low Speed Rate(%) 0
Channel Frame Non Unicast Rate(%) 42
Channel Frame Fragmentation Rate(%) 0
Channel Frame Error Rate(%) 0
Channel Bandwidth Rate(kbps) 1944
Channel Noise 92
Client Frame Retry Rate(%) 3
Client Frame Low Speed Rate(%) 0
Client Frame Non Unicast Rate(%) 0
Client Frame Fragmentation Rate(%) 0
Client Frame Receive Error Rate(%) 0
Client Bandwidth Rate(kbps) 1298
Client Tx Packets 424139
Client Rx Packets 310499
Client Tx Bytes 45428428
Client Rx Bytes 398323111
Client SNR 53
A2c_SM SeqNum, Old SeqNums 174 0

What band are those devices connecting on?  They could have 2.4ghz single-stream only wireless adapters, which might explain their issues.

I have several of the same Dell laptops connected on the network and some
of them connect up only on 2.4 and others connect on 5 utilizing the AC 80
MHz bandwidth at faster speeds. Currently, this device is connecting on the
2.4 GHz but it does have 5 GHz capability. They are Dell 3390 2in1 devices.

--
*Adam Moore*, CNA 6.5
Network+ Certified
Network Manager
Delano Union School District
661-721-5000 ext. 00135
amoore@duesd.org

Ultimately, the laptop decides what access point and what band it connects to.  We can influence it to connect to 5ghz by making sure that the 5ghz transmit power on the access point is 6 db higher than the 2.4ghz band.