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AP 50's UNBALANCE Bandwidth

Proudmore

Here is my question.......

 

 

we have 2 aps connected into the XG appliance.

 

one ap (AP 1) is connected/assigned near XG appliance and the second ap (AP 2) is connected/assigned more distant from XG.

 

The problem is

when AP1 is connected alone in XG appliance network speed/bandwidth is normal but then when both aps are connected, network became slow (no one is connected to AP2).

You must unplugged AP2 in order to make the network normal again.

 

Thank you



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  • 0

    Hi,

     

    For a detailed analysis, an air capture + packet capture on both APs would be required. In general, the two APs can influence each other depending on the traffic that's going on. There are two kind of interferences that would impact it:

    • Co-Channel interference: both APs are running on the same channel. The APs see each other, can sync airtime usage and thus share the bandwidth
    • Adjacent-channel interference: the APs influence each other but there is no sync, so this is more harmful.

    If both APs broadcast on the same or overlapping channels, the airtime used by one AP can't be used by the other. This can also be the case when no client is connected as beacons are sent and broadcast/multicast traffic is still submitted (while I'm not sure whether broadcast/multicast use all available channels).

    The default setting for SG and XG is 80Mhz channel width, which means if you configure your APs to talk on channels 36 and 40, you effectively cause adjacent-channel interference. If the available channels are limited, either reduce the channel width or put the APs on the same channel.

     

    Kind regards,

     

    Dirk Bolte

  • 0 in reply to DirkBolte

    Hi sir 

     

     

    In AP 55, you can only choose 2.4 and 5GHz frequency band..



     

    How can I change/customize it to 36 or 40 "MHz"

     

     

    Thank You

  • 0 in reply to Proudmore

    Hi,

     

    This page is a good reference for channel planing: http://www.revolutionwifi.net/revolutionwifi/2013/03/80211ac-channel-planning.html . Ideally, you should place them so that they don't overlap - or use the same channel so that they can align to each other.

    For changing the channel width, please use this as example: https://community.sophos.com/products/unified-threat-management/f/wireless-security/56512/40mhz-channels-300mbit-s-now-possible-since-v9-300 . For 5 Ghz on AP55/100, the parameters are VHT20, VHT40 and VHT80 .

    You can change the actual channel on the access point edit page on the UTM. Please see the following screenshot for reference:

     

     

    Kind regards,

     

    Dirk Bolte

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