Wireless slowness in 9800 AXI WLC

[ranjithkumarpullaikodi100]

Hi we are implemented 9800AXI WLC, now wireless speed is very less, in the datasheet it was mentioned 5.2gbps, now getting the speed is below 200 mbps.i have tested so many ways but no luck. it is working in the local switching.

anyone knows the solution

[Leo Laohoo]

What is the model of the AP?  9800 is a WLC (not an AP).

[ranjithkumarpullaikodi100]

C9120AXI-E

[Leo Laohoo]

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@ranjithkumarpullaikodi100 wrote:

C9120AXI-E

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1. What is the firmware of the WLC? 
2. What wireless client (NIC card and NIC card driver version) is used to test this speed? 
3. What radio was used 2.4 Ghz, 5.0 Ghz?  If 5.0 Ghz, what channel width was used? 

[ranjithkumarpullaikodi100]

Firmware version 17.6.2

wireless clients are windows laptop and adroid mobile and apple devices

using both radios

in 5 ghz channel is 80 mhz

[Leo Laohoo]

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@ranjithkumarpullaikodi100 wrote:

wireless clients are windows laptop

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I need more info than that. 
I want to determine if the Laptop's wireless NIC can even do >200 Mbps or not.

[ranjithkumarpullaikodi100]

for laptop NIC car is supporting 802.11 ac

[Leo Laohoo]

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@ranjithkumarpullaikodi100 wrote:

for laptop NIC car is supporting 802.11 ac

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Oh, FFS!

[Scott Fella]

Please provide the netsh show wlan report.  There is a link on how to do that on a previous post.

[Scott Fella]

To add to @Leo Laohoo and everyone here, you need to provide the client details.  Run the following command as an administrator: netsh wlan show wlanreport  Please attach that to the thread so that we have all the information.

You can reference this link for more details on the command.

Analyze the wireless network report (microsoft.com)

Other good commands:

netsh wlan show interfaces

netsh wlan show drivers

netsh wlan show capabilities

References:

Netsh WLAN Commands for Windows 10 - Find Wifi Key & More! (webservertalk.com)

[marce1000]

 - Many factors are involved. What is the client-model and OS. Does it have updated wireless drivers. Examine the connection status on the access point, such as band and channel used (e.g.)

 M.

[Scott Fella]

You will never get that speed. What is capable is also theoretical. Just search “802.11ax speed”. What throughput you get depends on the device and it’s support, your channel width that is defined and environmental variables. 

https://www.ni.com/en-us/innovations/white-papers/16/introduction-to-802-11ax-high-efficiency-wireless.html

[Scott Fella]

Just want to call this out also... On the data sheet, it states over-the-air, this is not over-the-wired.  That being said, if your ap is connected to a 1Gig ethernet port, the max you would see on the LAN is 1Gig.  Now since wireless is half duplex and wired is full-duplex, you will always theoretically see half of what the client shows as link speed.

Dual 5-GHz radio support

Enables both radios to operate in 5-GHz client serving mode, allowing an industry-leading 5.2 Gbps (2 x 2.6 Gbps) over-the-air speeds while increasing client capacity.

Now depending on your client and how that device and ap negotiates, you should be able to see the MCS rate from the AP.  You can then use the chart in this blog to identify the theoretical max that device can achieve.

802.11ax MCS Table | 802.11ax MCS Rates (rfwireless-world.com)

[Haydn Andrews]

As others have said that's the theoretical maximum that the radios can do.

You would need both radios running as 5 GHz and 80 MHz wide channels and a very clean airspace to start with (not practical anywhere outside of a lab if you ask me)

You then need the clients to push it but here is the issue, you need the sweet spot so your not over utilising the airspace 

Good blog here on why its not practical in 802.1ax https://divdyn.com/wi-fi-throughput/