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TX Rate Slow

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  • 1.  TX Rate Slow

    Posted Mar 03, 2015 09:12 AM

    I have an instant cluster consisting of IAP-225's running 6.4.2.0-4.1.1.1_46936 .  The issue that I am having is that my clients wont connect at the expected speeds even when standing next to the AP.  Signal strength is great for the client.  I am not sure what is causing the rate to be so slow. Please see the attached screen shot from my mac. This is the highest rate I have seen and I am only 5 feet from the AP. Most of the time my 802.11ac clients are running at sub 500mbps speeds.  I have another instant cluster at another location and the clients are seeing consistant speeds over 1Gbps.  

     

    Screen Shot 2015-03-03 at 8.07.29 AM.png


    #AP225


  • 2.  RE: TX Rate Slow

    Posted Mar 03, 2015 09:17 AM

    The speed can be a function of contention.  If there are more users contending for the medium, or there is some interference, clients will de-rate and negotiate at lower speeds.   Getting rates at over 1 gig in a half-duplex medium like wireless is a gift and not a given.  It is tougher still to maintain that rate, period.



  • 3.  RE: TX Rate Slow

    Posted Mar 03, 2015 09:19 AM

    Here is a screen shot from the IAP. Noise doesn't seem to be an issue for me. Could it be the Min/Max rates I have set for the SSID?  

    Screen Shot 2015-03-03 at 8.17.32 AM.png

    Screen Shot 2015-03-03 at 8.18.50 AM.png



  • 4.  RE: TX Rate Slow

    Posted Mar 03, 2015 09:23 AM

    The rates do not matter.  What is the model of that device?  It could also be limted by the number of spatial streams it is capable of.  http://chimera.labs.oreilly.com/books/1234000001739/ch02.html#comparison_of_ac_data_rates_to_other__phys

     

    Clients only acheive maximum rates under perfect conditions, short distances and virtually clean environments.



  • 5.  RE: TX Rate Slow

    Posted Mar 03, 2015 09:27 AM

    Device is IAP-225. It only has 5 clients connected and doesnt seem to have much noise/interference.  Could it be because 80MHz is disabled?  Would it hurt anything to enable it?Screen Shot 2015-03-03 at 8.26.33 AM.png



  • 6.  RE: TX Rate Slow
    Best Answer

    Posted Mar 03, 2015 09:29 AM

    Please take a look at the chart at the link I posted above to see what rates are possible with what AP/Client settings to determine that.



  • 7.  RE: TX Rate Slow

    Posted Mar 03, 2015 09:39 AM

    Resolved. Enabled 80MHz and I am getting +1Gbps speed for AC clients. Thanks for the help.