Wireless Access

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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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Signal fluxuation

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  • 1.  Signal fluxuation

    Posted May 20, 2013 09:51 AM

    Hi!  I have about 40 IAP105's deployed throughout my small K-8 campus..   half of the campus is old with brick walls, and the other half is newer with metal walls and such..   I pretty much have an AP in every classroom and a few halls ways..  they are really close to one another..  but there are several locations where clients are experiencing si\gnal fluxuations..   They aren't AP bouncing, they seem to be causing the AP to adjust power whenever the client reachers the wierd spots..     we have PowerDsine 9024g POEI powering the AP's..  its wierd.. I could stand right under an AP and just move into a bathroom 6 feet away with no obvious interference and the signal bars on the client just keep going strong/weak/strong/weak..  fluxuating every 10 seconds or so.. 

     

    Anyone have any ideas?



  • 2.  RE: Signal fluxuation

    Posted May 20, 2013 11:03 AM

     

     

    On the IAP do you see a lot of power levels changes ?

     

    What type of clients are you using?

     

    What IAP OS you have installed?

     



  • 3.  RE: Signal fluxuation

    Posted May 20, 2013 11:18 AM

    Oh yes, lots and lots of power level changes....  Is that normal?

     

    Of 150 clients, about 100 IOS... (ipads, iphones).. and 30-40 windows, and the rest android..

     

    OS VERS: 

    Name:
    Aruba Operating System Software
    Type:
    105
    Build Time:
    2013-02-15 22:20:03 PST
    Version:
    6.2.0.0-3.2.0.2_37229

     

     

     



  • 4.  RE: Signal fluxuation

    Posted May 20, 2013 12:12 PM

     

    A lot of power level  or channel changes is not good, run the following commands this should give you an idea of what's going on in your environment :

     Go to Support > and then run these commands :

     

    AP ARM Neighbors

    AP ARM history

    AP ARM RF Summary

    AP Monitor AP Table

     

    Show ARM.png



  • 5.  RE: Signal fluxuation

    Posted May 20, 2013 12:29 PM

    I can run those commands, but its all greek to me!   doesn't tell me anything..

     

    But here it is:

     

    *********************************************************************************************************
    5/20/2013 12:27:39 PM Target: COUN1 Command: show ap arm history
    *********************************************************************************************************

    Interface :wifi0
    ARM History
    -----------
    Time of Change Old Channel New Channel Old Power New Power Reason
    -------------- ----------- ----------- --------- --------- ------
    2013-05-17 13:41:18 149+ 149+ 18 21 P+
    2013-05-17 13:39:00 149+ 149+ 21 18 P-
    2013-05-17 13:37:13 149+ 149+ Max 21 P-
    Interface :wifi1
    ARM History
    -----------
    Time of Change Old Channel New Channel Old Power New Power Reason
    -------------- ----------- ----------- --------- --------- ------
    2013-05-17 13:37:14 11 11 Max 21 P-
    I: Interference, R: Radar detection, N: Noise exceeded, Q: Bad Channel Quality E: Error threshold exceeded, INV: Invalid Channel, G: Rogue AP Containment, M: Empty Channel, P+: Increase Power, P-: Decrease Power, 40INT: 40MHZ intol detected on 2.4G, NO40INT: 40MHz intol cleared on 2.4G, OFF: Turn off Radio, ON: Turn on Radio

    *********************************************************************************************************
    5/20/2013 12:26:53 PM Target: COUN1 Command: show arm config
    *********************************************************************************************************

    Minimum Transmit Power :15
    Maximum Transmit Power :21
    Band Steering Mode :prefer-5ghz
    Client Aware :enable
    Scanning :enable
    Wide Channel Bands :5ghz
    Air Time Fairness Mode :default-access
    Custom Channels :No
    2.4 GHz Channels
    ----------------
    Channel Status
    ------- ------
    1 enable
    2 disable
    3 disable
    4 disable
    5 disable
    6 enable
    7 disable
    8 disable
    9 disable
    10 disable
    11 enable
    1+ enable
    2+ disable
    3+ disable
    4+ disable
    5+ disable
    6+ disable
    7+ enable
    5.0 GHz Channels
    ----------------
    Channel Status
    ------- ------
    36 enable
    40 enable
    44 enable
    48 enable
    52 disable
    56 disable
    60 disable
    64 disable
    100 disable
    104 disable
    108 disable
    112 disable
    116 disable
    132 disable
    136 disable
    140 disable
    149 enable
    153 enable
    157 enable
    161 enable
    165 enable
    36+ enable
    44+ enable
    52+ disable
    60+ disable
    100+ disable
    108+ disable
    132+ disable
    149+ enable
    157+ enable

    *********************************************************************************************************
    5/20/2013 12:25:20 PM Target: COUN1 Command: show ap arm neighbors
    *********************************************************************************************************

    ARM Neighbors
    -------------
    bssid essid channel rssi tx-power PL (dB) AP Flags Last Update (Total updates)
    ----- ----- ------- ---- -------- ------- -------- ---------------------------
    00:22:6b:68:69:c0 STMM 1 18 0 0 Passive
    6c:f3:7f:3d:9b:02 SMM_GUEST 11 7 17 107 Passive
    6c:f3:7f:3d:9b:03 SMM 11 8 17 106 Passive
    6c:f3:7f:3d:8c:da SMM_GUEST 149 17 21 98 Passive
    6c:f3:7f:3d:8c:db SMM 149 17 21 97 Passive
    6c:f3:7f:3d:8c:d2 SMM_GUEST 6 14 7 88 Passive
    00:90:4b:33:83:f8 6 40 0 0 Passive
    6c:f3:7f:3d:9e:9a SMM_GUEST 157 9 21 105 Passive
    6c:f3:7f:3d:9e:9b SMM 157 10 21 104 Passive
    6c:f3:7f:3d:99:b3 SMM 1 44 17 68 Passive
    6c:f3:7f:3d:9e:92 SMM_GUEST 1 21 17 90 Passive
    6c:f3:7f:3d:9e:93 SMM 1 22 17 89 Passive
    6c:f3:7f:3d:96:43 SMM 11 4 17 109 Passive
    6c:f3:7f:3d:96:42 SMM_GUEST 11 5 17 107 Passive
    6c:f3:7f:3d:9b:0b SMM 48 9 21 107 Passive
    6c:f3:7f:3d:9b:0a SMM_GUEST 48 11 21 111 Passive
    6c:f3:7f:3d:8c:d3 SMM 6 14 0 0 Passive
    6c:f3:7f:3d:99:bb SMM 36 29 22 93 Passive
    6c:f3:7f:3d:99:ba SMM_GUEST 36 29 22 94 Passive
    6c:f3:7f:3d:9b:6a SMM_GUEST 44 39 21 77 Passive
    6c:f3:7f:3d:9b:6b SMM 44 39 21 76 Passive
    6c:f3:7f:3d:9a:d3 SMM 6 12 0 0 Passive
    6c:f3:7f:3d:9a:db SMM 36 5 0 0 Passive
    6c:f3:7f:3d:9a:da SMM_GUEST 36 5 21 112 Passive
    6c:f3:7f:3d:99:b2 SMM_GUEST 1 43 17 66 Passive
    6c:f3:7f:3d:9a:d2 SMM_GUEST 6 13 0 0 Passive
    6c:f3:7f:3d:9b:63 SMM 1 46 17 66 Passive
    6c:f3:7f:3d:8e:32 SMM_GUEST 11 4 17 108 Passive
    6c:f3:7f:3d:9b:62 SMM_GUEST 1 45 17 67 Passive
    6c:f3:7f:3d:96:4a SMM_GUEST 48 5 9 99 Passive
    6c:f3:7f:3d:8e:33 11 2 0 0 Passive
    Neighbor Summary:One hop 31 Two hop 0 Current Time: 2013-05-20 12:25:10

    *********************************************************************************************************
    5/20/2013 12:24:03 PM Target: COUN1 Command: show arm-channels
    *********************************************************************************************************

    2.4 GHz
    -------
    Channel Status
    ------- ------
    1 enable
    2 disable
    3 disable
    4 disable
    5 disable
    6 enable
    7 disable
    8 disable
    9 disable
    10 disable
    11 enable
    1+ enable
    2+ disable
    3+ disable
    4+ disable
    5+ disable
    6+ disable
    7+ enable
    5.0 GHz
    -------
    Channel Status
    ------- ------
    36 enable
    40 enable
    44 enable
    48 enable
    52 disable
    56 disable
    60 disable
    64 disable
    100 disable
    104 disable
    108 disable
    112 disable
    116 disable
    132 disable
    136 disable
    140 disable
    149 enable
    153 enable
    157 enable
    161 enable
    165 enable
    36+ enable
    44+ enable
    52+ disable
    60+ disable
    100+ disable
    108+ disable
    132+ disable
    149+ enable
    157+ enable



  • 6.  RE: Signal fluxuation

    Posted May 20, 2013 12:57 PM
      |   view attached

     

    Is that output from one of the IAP you are seeing issues from ?

     

    Are you experiencing network drops on those wireless devices ?

     

    Have you tried running a speed test to see if you are experiencing performance issues when the signal fluctuates  ?

     

    Are you experiencing this on all devices : iOS and Windows devices?

     

    Have you tried updating the drivers?

     

     

    Those commands allow you to see the ARM RF information  on a particular AP:

     

    show ap arm history
    show ap arm history {ap-name <ap-name>}|{bssid <bssid>}|{ip-addr <ip-addr>}
    Description
    For each interface on an AP, show the history of channel and power changes due to Adaptive Radio
    Management (ARM).

     

    show ap arm neighbors
    show ap arm neighbors {ap-name <ap-name>}|{bssid <bssid>}|{ip-addr <ip-addr>}
    Description
    Show the ARM settings for an AP’s neighbors.

     

    show ap arm rf-summary
    show ap arm rf-summary {ap-name <ap-name>}|{bssid <bssid>}|{ip-addr <ip-addr>}
    Description
    Show the state and statistics for all channels being monitored by an individual AP.

     

     

    Attachment(s)

    pdf
    ArubaOS_6.1CRG.pdf   4.27 MB 1 version


  • 7.  RE: Signal fluxuation

    Posted May 20, 2013 01:06 PM

    Yes.. that is the output from just one of the IAP's that is in a spot that I am having problems..  I can put in another IAP in its place and will experience the same issue..  

     

    I am experience network drops and performance issues when this is happening..   Most of the time cannot get out to the web to perform a speed test...    ping times are really bad...

     

    This is happening on all personal devices like iphones, ipads, android phones..  I can put a newer laptop in there it doesn't appear to be affected.

     



  • 8.  RE: Signal fluxuation

    Posted May 21, 2013 09:05 AM

     

    Also based on the output you provided it doesn't seem like there's a lot of power level / channel changes on that AP that you are having issues with.

     

    Are you sharing the wireless IP segment with anything else on your environment ?

     

     



  • 9.  RE: Signal fluxuation

    Posted May 21, 2013 12:00 PM

    So changing power levels 6 times in 2 minutes isn't alot?

     

    2013-05-21 11:53:41 149+ 149+ 18 21 P+
    2013-05-21 11:53:25 149+ 149+ 15 18 P+
    2013-05-21 11:53:24 36+ 149+ 15 15 I
    2013-05-21 11:50:55 36+ 36+ 18 15 P-
    2013-05-21 11:50:54 36+ 36+ 21 18 P-
    2013-05-21 11:50:48 36+ 36+ Max 21 P-

     

    and I just tried a totally different POEI....    

     

    I don't know what you mean by sharing the segment..  all the AP's connect to my main switch..  which has everything else plugged into it..

     



  • 10.  RE: Signal fluxuation

    Posted May 21, 2013 12:09 PM

     

    On this particular output it does show a lot of power/channel changes in a small period of time , but the one you posted yesterday it didn't have that many power changes is this the same IAP ?

     

    It looks like most of those changes are occuring on the 802.11a band , do you have those IAPs staggered ?

     

    POEI ?

     

    Do you have any other devices beside the AP/Clients on the using the same VLAN ?



  • 11.  RE: Signal fluxuation

    Posted May 21, 2013 12:16 PM

    It was the same AP.. however the data I showed you yesterday did not include having a client connected to it I thinlk...   I just brought one over there just now and rechecked the history of power level changes...and now we have new data..

     

    I'm not sure I know what you mean by having the IAP's staggered..  as in physically spaced out in such a way?

     

    Power over ethernet Injector..   I thought that maybe the power level changes were due to the injector I was using, so I tried a brand new different manufacturer injector..  but still got the issue..  

     

    I only have the AP's and Clients on that same VLAN...  however, the VLAN isn't isolated..  I can access other subnets at the moment..  which means, servers, workstations, printers, and my NAS device..    



  • 12.  RE: Signal fluxuation

    Posted May 21, 2013 12:21 PM

     


    Staggered : How did you distributed those APs physically ? Or you just added an IAP in each classroom ?

     

     

    Did you get a chance to try with the newer laptop ?

     

     

     



  • 13.  RE: Signal fluxuation

    Posted May 21, 2013 12:28 PM

    Well, I placed the AP's more less just spacing them evenly around the campus, however I did put them in class rooms mostly because the walls are concrete...   but the AP we are dealing with right now, is not within concrete walls, but above the ceiling tile..   the AP's are pretty close to one another..    the one we are working with right now, has another one about 50 feet away from it..

     

    A newer laptop does NOT seem to exhibit the fluctuation issue.



  • 14.  RE: Signal fluxuation

    Posted May 21, 2013 12:32 PM
    &nbsp;
    The reason you saw those power/channel changes because you had to unplug the IAP to change power injector and ARM had to recalculate
    &nbsp;
    You may want to look into updating at least one of those devices and see what happens.


  • 15.  RE: Signal fluxuation

    Posted May 21, 2013 01:16 PM

    I realize the first three were because I unplugged the IAP.. but then the second three were obvious power level changes..  .....   the device I had connected was an iPhone 5 with the latest iOS update..    why does it change level anyway?



  • 16.  RE: Signal fluxuation

    Posted May 21, 2013 01:32 PM

    Interesting thing..  If i disconnect the neighboring IAP's, I do not get a power adjustment..  why is that?



  • 17.  RE: Signal fluxuation

    Posted May 21, 2013 01:53 PM

     

    The APs will do a RF scan and then calculate the Power levels and Channel assignment (ARM Algorithm) based on the information obtain during the RF Scan

     

    Read this :

     

    http://www.arubanetworks.com/pdf/solutions/TB_ARM.pdf



  • 18.  RE: Signal fluxuation

    Posted May 22, 2013 08:24 AM

     

     

    - Have you checked what channel the iPhone 5 uses versus the laptop ?

    - Have you tried downloading the Speed test app on your iPhone and then run it to see what download/upload speeds you get ?

    - Do you see the issues only when you go to certain websites ?