Wireless Access

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Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Phy rate vs Throughput

Hi,

How are the phy rate of the link calculated ? .What is the relaiabilty of phy rate or instead do we need to run a throughput test ? .

If  phy rate shows of an ac adpter shows 870 Mb , Does it mean it support 2x2 spatial streams 

Thanks

Guru Elite
Posts: 8,631
Registered: ‎09-08-2010

Re: Phy rate vs Throughput

For a phy rate of 866, you can expect a maximum throughput of 433 Mbps. You can see spatial streams by using the command: show ap association. It varies based on channel width.


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Re: Phy rate vs Throughput

Hi, When you talk about 433 Mbps , is it udp or tcp ?. Thanks
Guru Elite
Posts: 8,631
Registered: ‎09-08-2010

Re: Phy rate vs Throughput

That's maximum theoretical throughput. The protocol is irrelevant. 

Sent from Nine

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Re: Phy rate vs Throughput

Hi,

when we  run throughput test using  iperf (tcp ) ,getting 200Mb. but when it is udp its getting around 400 Mbps

?

Thank you

Guru Elite
Posts: 21,253
Registered: ‎03-29-2007

Re: Phy rate vs Throughput

TCP requires that the destination send an acknowledgement, so it has more overhead than UDP.  That holds true regardless if it is wired or wireless.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Re: Phy rate vs Throughput

Hi,

Thank you for your reply . So when doing a throughput test , Choose UDP or TCP ?

Thanks

Guru Elite
Posts: 21,253
Registered: ‎03-29-2007

Re: Phy rate vs Throughput

The question is, what is your goal?  TCP throughput tests one type of application and UDP tests another type.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Occasional Contributor II
Posts: 81
Registered: ‎01-16-2016

Re: Phy rate vs Throughput

Hi,

"For a phy rate of 866, you can expect a maximum throughput of 433 Mbps" ,

I was asking 433 Mbps might be UDP throughput ?

And one more question , If the  client shows phy rate 1300 Mbps , Does it mean it supports 3x3 ?

Thanks

 

 

Aruba
Posts: 1,290
Registered: ‎08-29-2007

Re: Phy rate vs Throughput

Refer to this table http://mcsindex.com/

 

So for 1300 Mbps, that is likely a 3x3 80 MHz SGI connection.


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
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