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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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What exactly is meant by the Aruba 225 spec of 2.4 GHz radio in 1x3:1 spatial-stream mode?

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  • 1.  What exactly is meant by the Aruba 225 spec of 2.4 GHz radio in 1x3:1 spatial-stream mode?

    Posted Mar 30, 2016 05:40 AM
      |   view attached

    I wanted to have a better explanation of what the "1x3:1 spatial-stream mode" means for the 2.4-Ghz radio when operating in a non PoE+ environment.  How many 2.4 radios are used? Is there any MIMO in this case? 


    #AP225


  • 2.  RE: What exactly is meant by the Aruba 225 spec of 2.4 GHz radio in 1x3:1 spatial-stream mode?
    Best Answer

    EMPLOYEE
    Posted Mar 30, 2016 06:28 AM
    Hi,

    1x3:1 means 1 transmitter, 3 receivers and 1 spatial stream.


  • 3.  RE: What exactly is meant by the Aruba 225 spec of 2.4 GHz radio in 1x3:1 spatial-stream mode?

    Posted Mar 30, 2016 07:11 AM

    Thanks Rajaguru, so when the device is powered with PoE+ the 2.4GHz can operate at 3x3? And with how many spatial streams at full operational mode on the 2.4GHz spectrum?

     

    What kind of theorhetical throughput is gained when using full PoE+ power standards with the 225 APs?

    I see in the brochure the full operational use for the 5GHz spectrum is: 802.11n/ac: 3x3 MIMO with up to three spatial streams but I am a bit confused about the full potential of the 2.4GHz side of the AP.



  • 4.  RE: What exactly is meant by the Aruba 225 spec of 2.4 GHz radio in 1x3:1 spatial-stream mode?

    EMPLOYEE
    Posted Mar 30, 2016 04:35 PM

    Hi, 

     

    This is from the 225 datasheet. 

    ===== 

    AP-225 and IAP-225 - 2.4-GHz (600 Mbps max) and 5-GHz (1.3 Gbps max) radios, each with 3x3 MIMO and three integrated omnidirectional downtilt antennas.

    • AP-224 and IAP-224 - 2.4-GHz (600 Mbps max) and 5-GHz (1.3 Gbps max) radios, each with 3x3 MIMO and three combined, diplexed external antenna connectors. 

    ====== 

     

    With 3x3 in 802.11n QAM-64, that max theoritical throughput is 450 Mbps which is the standard. 

     

    AP 225 has the turbo QAM feature. With 3x3 and turbo QAM (i.e QAM-256) the max theoritical throughput is 600 Mbps. 

     

    For more details about throughput, spatial streams, modulations, etc you can check http://mcsindex.com/