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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 514 with external directional antenna - misconfiguration issue?

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  • 1.  AP 514 with external directional antenna - misconfiguration issue?

    Posted Dec 07, 2021 06:49 AM

    I have recently surveyed an Aruba wi-fi deployment (mix of AP 514 & 515) and found some problems, inconsistent with the beacon captured information.
    Access to the Controller was not permitted.

    All the 514 AP's with external antennas AP-ANT-48 are not able to properly cover their intended areas (in both bands). The Sidekick measured RSSI from such an APs barely exceeds -65dBm all over the surface, even at 2 meters in front of the antenna. All the RF cables are properly connected and the antenna's gain has been measured (after disconnecting antenna, RSSI drops ~8dB).

    The TPC current power info captured from the beacon frames shows these APs are emitting with ETSI maximum allowed EIRPs (21/27 dBm, depending on the sub-band). (The criterion for these limitations with Aruba is a whole other topic, so let's not discuss that here).
    All the other 515 APs with integrated omni antennas, ensure decent coverage, while emitting with the same maximum powers.

    What could be the problem here?

    I have a hunch that they haven't correctly defined the external antennas' gains. Do you know what is Aruba's behavior if antennas are not defined at all?

    Thank you



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    Alexandru Vrabie | CWNA | Ekahau ECSE | Wireless Site Survey Specialist
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  • 2.  RE: AP 514 with external directional antenna - misconfiguration issue?

    Posted Dec 07, 2021 07:37 AM
    There are too many variables to guess.  You should confirm that the gain is indeed entered correctly, but that might not be the issue.

    Have you tried to survey further out than two meters and in different directions to get a sense of the pattern of coverage?

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    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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  • 3.  RE: AP 514 with external directional antenna - misconfiguration issue?

    Posted Dec 07, 2021 07:42 AM
    Of course I've surveyed the whole facility, that's how it's usually done...
    I was trying to point out the fact that there is no decent coverage even in the closest proximity. The pattern looks alright for this directional antenna, but the RSSI's are very low. 
    I know there's a lot of variables, but I just need to know what happens when antennas are not defined; if you could answer me that, I would appreciate it...I can't confirm anything without controller access, otherwise wouldn't have posted this, right?

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    Alexandru Vrabie | CWNA | Ekahau ECSE | Wireless Site Survey Specialist
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  • 4.  RE: AP 514 with external directional antenna - misconfiguration issue?

    Posted Dec 07, 2021 08:07 AM
    Going back to: "Sidekick measured RSSI barely exceeds -65dBm at 2 meters in front of the antenna."  Is there coverage beyond that?  Could you be measuring a signal that is reflected?

    Nevermind.

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    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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  • 5.  RE: AP 514 with external directional antenna - misconfiguration issue?

    Posted Dec 07, 2021 08:24 AM
    :)

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    Alexandru Vrabie | CWNA | Ekahau ECSE | Wireless Site Survey Specialist
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