AP3865 - Achieving High Throughput with 11ac

  • 20 January 2015
  • 7 replies
  • 355 views

Userlevel 7
Hi,

I just play around with the 802.11ac AP3865 and wonder how I'd get the max thruput.

I've used the settings that are mentioned in the 9.15 user guide "Achieving High Throughput with 11n and 11ac" chapter.

Here the parameter for Aggregate MPDU Max Length is missing or wrong as the value in the manual is "enable" instead of a real number so I've left it on the default of 1048575.

Another thing is TXBF - why is there no field do enable/disable it - the option is available on radio#2 - or is it always on for 802.11ac ?

The result of a short iperf test (15streams) with a Netgear A6210 802.11ac adapter is a thruput of 330Mbit.
I've tried with another vendors AP 4:4:3 and it was 410Mbit.

Regarding the VNS config I've used bridge@AP, open/none, WMM&802.11e, 100% airtime.

Anything that I'd change to get a better result or is that the max. that I should expect ???

Thanks,
Ron



7 replies

Userlevel 7
Made a mistake in my test setup and I'm not sure whether that could affect the result.
The AP was powered by a D2 which only has 802.3af instead of 802.3at.
Userlevel 6
Made a mistake in my test setup and I'm not sure whether that could affect the result.
The AP was powered by a D2 which only has 802.3af instead of 802.3at.
The AP3865 should achieve full performance with 802.3af. 4x4:3 sounds like the big C. What RSS and MCS are you seeing for the client, and how far away from the AP is it?
Userlevel 7
All the settings look fine. I would suggest turning off MSDU, txbf is not supported on the AC radio at this time. What is your TCP window size set to in iperf? Make sure it's set to the max.

-Doug
Userlevel 7
As it was not clear whether the AP needs 802.3at power or also work with 802.3af I've opened a ticket - here the official answer...

"The AP3865e requires an 802.at (POE+) power source. This AP is not tested with 802.11af (POE), so even if the device powers up and provides some functionality under AF, such deployments are not supported."

I've also asked about the function of the 2 LAN ports....
"Yes, the AP3865e sources power only from LAN#1 (POE Input). The second port (LAN#2/”Pwr Out”) is designed to eventually (not yet supported) be able to itself provide 802.3af (POE) power to some other chained device (example a security camera). Because of this design goal, the AP3865e does not support redundant power supplies, however, you can use the two ports for link aggregation."
Userlevel 2
Is the adapter USB?. If so which version? Remember there is a limit to the throughput of USB too.
Userlevel 4
Can you post the iperf cmd lines you are using for server and client?
Userlevel 7
The APs are already installed at the customer site.
If I'm not too busy I'll try it with some AP3825 next week.
I'll let you know the results and my exact settings.

-Ron

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