Wireless Access

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Occasional Contributor II

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

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
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II

Re: Phy rate vs Throughput

Hi, When you talk about 433 Mbps , is it udp or tcp ?. Thanks
Guru Elite

Re: Phy rate vs Throughput

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

Sent from Nine

Tim Cappalli | Aruba Security
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II

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

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.


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Occasional Contributor II

Re: Phy rate vs Throughput

Hi,

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

Thanks

Guru Elite

Re: Phy rate vs Throughput

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


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
ArubaOS 8.3 User Guide
InstantOS 8.3 User Guide
Airheads Knowledgebase
Occasional Contributor II

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

 

 

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, ACCX #817, ACMP, ACMX #294
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