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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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AP 515 giving low speed

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  • 1.  AP 515 giving low speed

    Posted Aug 29, 2019 12:39 PM
    We have implemented AP 515 with 1 Giga speed internet and all the layer 2 & 3 devices have 10 g single mode connection.

    Each port in SW and connection to AP gives around 1 Giga speed download and upload 1:1 stable through ethernet.

    From a laptop when I test the AP wireless maximum of 400 Mbps can be reached.
    Even when we are close to AP.
    Aruba sensor can reach around 800 Mbps

    We need to reach the speed of 800 at least through wireless.

    Kindly assist.

    controller 7210 Aos 8.5.2
    And AP 510


  • 2.  RE: AP 515 giving low speed

    EMPLOYEE
    Posted Aug 30, 2019 04:19 AM

    If the Aruba sensor can reach 800 Mbps, and your laptop only 400, it's likely a limitation on your laptop. What type of laptop are you using? Also, how do you determine the speed? Is that the connection speed in the client or AP? Or is that an iPerf? Speedtest?

     

    The sensor has an "802.11 n/ac dual-band Wi-Fi (2.4 & 5 GHz) with dual-stream MIMO", and if you reach half of the throughput with your laptop it can be that it is only a single stream device, or that your laptop falls back to 2.4GHz instead of 5GHz.

     

    It is really hard from a distance to determine what is happening here, but there is very likely an explanation, and it is likely in the client capabilities/driver/settings. Do you have an Aruba partner or someone else with experience on this topic that you can consult?



  • 3.  RE: AP 515 giving low speed

    Posted Aug 30, 2019 06:33 AM
    What type of laptop are you using?

    - We are using hp pro book 450 g4, but we are able to reach speed of 560 Mbps connected to AP 325

    I would like to why AP 325 gives out more speed compared to AP515
    Also, how do you determine the speed? Is that the connection speed in the client or AP? Or is that an iPerf? Speedtest?

    -We determine speed through speed test


  • 4.  RE: AP 515 giving low speed

    EMPLOYEE
    Posted Aug 30, 2019 09:33 AM

    You should type "show ap association mac <client mac address>" to see the client capabilities.



  • 5.  RE: AP 515 giving low speed

    Posted Sep 07, 2019 01:54 PM
    The client has 8ss capability, it is a Samsung Note 10 with wifi ax support and still, we could not achieve the desired speed.

    Kindly assist.


  • 6.  RE: AP 515 giving low speed

    Posted Sep 07, 2019 02:01 PM
    Client with 8ss ?! And a mobile phone... Its just 802.11ax with 1x1:1

    So you wrong... , More info here:

    Samsung claims the following specs for the Wi-Fi in the S10 phones which are supposedly using the BCM4375:

    Wi-Fi 802.11 a/b/g/n/ac/ax (2.4/5GHz),VHT80 MU-MIMO,1024QAM
    Up to 1.2Gbps Download / Up to 1.2Gbps Upload
    Who knows what Broadcom used to come up with their 1.429 Gbps PHY rate claim. Possibly some unmentioned non-standard feature enables it. My (complete) guess is that it comes from the Real Simultaneous Dual-Band (RSDB) feature which likely allows the chip to operate a single spatial stream of 802.11ax at 2.4GHz and 5GHz simultaneously.

    2.4GHz 1x1:1 802.11ax (HE40,256-QAM) ~ 229 Mbps
    5GHz 1x1:1 802.11ax (HE160,1024-QAM) ~ 1200 Mbps

    Adding these two PHY rates together gives 1429 Mbps. Few, if any, clients would be able to connect to both bands simultaneously so this speed claim is misleading but that is not uncommon in this industry.


  • 7.  RE: AP 515 giving low speed

    Posted Sep 08, 2019 12:18 AM
    Finally, is it possible to achieve a minimum speed of 700 Mbps through this device?


  • 8.  RE: AP 515 giving low speed

    EMPLOYEE
    Posted Nov 05, 2019 12:17 PM

    what was the final speed reached here?



  • 9.  RE: AP 515 giving low speed

    Posted Aug 09, 2022 09:06 AM
    Did anyone manage to get a connection speed with 2.4Gbps connection speed?
    This should be possible with DL-MU-MIMO devices.

    My  HP laptops connects with 2.4Gbps to every cheap supermarket ax-ap, but only with 1.2Gbps to 515 (instant).

    Thx.


  • 10.  RE: AP 515 giving low speed

    EMPLOYEE
    Posted Aug 10, 2022 03:50 AM
    Which channel and channel width do you have configured?
    With how many spatial streams does your client connect to each of the APs?

    Could it be that the supermarket AP is configured with 160MHz channels, where the AP515 uses 40MHz (and 4 SS) or 80MHz (and 2 SS) to get to 1.2Gbps?

    There are other posts on this forum to explain that using 160MHz channels may work in residential applications, but not in enterprise.

    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------



  • 11.  RE: AP 515 giving low speed

    MVP EXPERT
    Posted Aug 10, 2022 04:23 AM
    Hi Vestra,

    The max. WiFi association speed (not a speedtest) depends on a some parameters, for example the channel-width, Signal-to-Noise (SNR, Signal Strength, Guard Interval and Spatial Streams (antenna count) that is supported by the AP as well the client. This all together give you a Modulation and Coding what desire what the max. WiFi association speed can be, we talk here about a 802.11 Wi-Fi frame and NOT a 802.3 ethernet frame.

    The max. speedtest what you can get is roughly 50% of the Wifi association speed. Why? Because Wi-Fi have a big overhead vs the payload. Example: Before Elon Musk can bring a small satellite into space he needs a huge rocket. The huge rocket is the 802.11 wifi frame and the satellite is the 802.3 ethernet frame, your real network data.

    So wifi frames have a large overhead versus the ethernet payload. But there is more. Wifi known interference, more interference is more re-transmissions. Every WiFi network have some re-transmissions of data. And a third factor is that Wi-Fi is a half-duplex medium that only can speak one by one. You will not notice this in a not crowded area but when there are a lot of wifi users the air will be crowded and everyone is wait on each other (in the same channel).

    OK! Why is your home wifi faster then you experience with an enterprise solution on the office? Because! :). Vendors will show there best capabilities, put the hardware on the maximum limits, most important one is the put them on 160Mhz channels to get te fastest performance. But at home it is ONLY YOU, and maybe a neighbor that use the spectrum some times. At the office there can be 100 or 1000s of access points with many clients that all using the wifi during a officeday, low latency apps like MS Teams etc. are using the hole day.

    At this point you need the share the air with others, we need more separate channels that not interfere with each others to hold the waiting lines low. So we put the access points on the office on 40MHz, much lower speeds but we have a great performance (stability) for everybody because we can use more separate channels then we had with 160Mhz.

    So the 160MHz channels that u can use at home will not fit in a crowdy office and that's where its different. Also maybe your AP can support 160MHz channels and have a lot spatial stream antennes (AP-515 has 2x2:2 at 2.4Ghz and 4:4:4x at 5Ghz), but most client chipsets in the phones only support 80MHz max. with maybe 2x2:2, so the speed wil lower then the access point can deliver.

    Please note that the max. speed that the vendor is put on the box is never reachable, they show you the max. 802.11 modulation rates without any loss, do you remember the big rocket of Elon? So that's why you must be lucky when you get 50% of it in a real speedtest, the rest depends on configuration and design for office networks.

    If you like to known more about modulation and coding scheme's, take a look here.
    https://semfionetworks.com/blog/mcs-table-updated-with-80211ax-data-rates/

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    Marcel Koedijk | MVP Expert 2022 | ACEP | ACMP | ACCP | ACDP | Ekahau ECSE | Not an HPE Employee | Opinions are my own
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