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802.11n 2.4Ghz strange isues

Posted: Fri Sep 10, 2010 2:00 pm
by dejanb

I have some strange problems with 802.11n 2.4GHz base station.


IBM x86 PC as mikrotik ap
Mini pci card TP-LINK TL-WN861N
2x TP-LINK omni antennas
2x 3m low loss 50ohm coax. cable.


Mikrotik 4.9


I have for about 10 clinets asocciated, eight of them are using 2.4GHz b/g devices, and two of them using Levelone WBR-6002 802.11n draft devices.

All signals are between -55 to -65, SNR 40-45dbm

Sometimes it's working perfect, good signal strenght, good data rates, but sometime ONLY WBR-6002 devices are having problems, signal is still good, but Signal-To-Noise falls to 5-6 dbm, data rates are changing every second, ping is very bad, when this happens, other asocciated clients doesn't have any problems, only 802.11n devices.

Tried to change WBR-6002 devices, with other, new, same product, but the problem is same.
I changed frequency too, but with no luck, it's rural place and when i scan i see only two or three base stations, so i think it's not intereference problem.

My config:

name="wlan-ap-2.4GHzN" mtu=1500 mac-address=00:1D:0F:BC:40:F5 arp=enabled interface-type=Atheros 11N 
      mode=ap-bridge ssid="S3" frequency=2432 band=2ghz-b/g/n scan-list=default wds-mode=disabled 
      wds-default-bridge=none wds-ignore-ssid=no default-authentication=yes default-forwarding=no 
      default-ap-tx-limit=0 default-client-tx-limit=0 hide-ssid=no security-profile=default compression=no
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 area=" arp=enabled band=\
    2ghz-b/g/n basic-rates-a/g=6Mbps basic-rates-b=1Mbps comment="" compression=no country=no_country_set \
    default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=0 default-forwarding=no dfs-mode=none \
    disable-running-check=no disabled=no disconnect-timeout=3s frame-lifetime=0 frequency=2432 frequency-mode=\
    manual-txpower frequency-offset=0 hide-ssid=no ht-ampdu-priorities=0 ht-amsdu-limit=8192 ht-amsdu-threshold=8192 \
    ht-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7 ht-extension-channel=disabled ht-guard-interval=any \
    ht-rxchains=0,2 ht-supported-mcs=\
    mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7,mcs-8,mcs-9,mcs-10,mcs-11,mcs-12,mcs-13,mcs-14,mcs-15 \
    ht-txchains=0,2 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 \
    hw-retries=4 l2mtu=2290 mac-address=00:1D:0F:BC:40:F5 max-station-count=2007 mode=ap-bridge mtu=1500 name=\
    wlan-ap-2.4GHzN on-fail-retry-time=100ms periodic-calibration=default periodic-calibration-interval=60 \
    preamble-mode=both proprietary-extensions=post-2.9.25 radio-name="" rate-set=default scan-list=default \
    security-profile=default ssid=S3 station-bridge-clone-mac=00:00:00:00:00:00 supported-rates-a/g=\
    6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps \
    tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=none \
    wds-default-cost=100 wds-ignore-ssid=no wds-mode=disabled wmm-support=disabled
I hope we can solve this problem...

Best Regards!

Re: 802.11n 2.4Ghz strange isues

Posted: Fri Sep 10, 2010 3:33 pm
by temuri426
maby your card doesn't supports g and N simultaneous connections ....

Re: 802.11n 2.4Ghz strange isues

Posted: Fri Sep 10, 2010 8:47 pm
by dejanb
maby your card doesn't supports g and N simultaneous connections ....

Did you think ap at the client side (levelone WBR-6002)?
I will check that as soon as possible.

Best Regards!

Re: 802.11n 2.4Ghz strange isues

Posted: Wed Sep 22, 2010 4:24 pm
by dejanb

I checked with LevelOne support team, and they said that model WBR-6002 is fully compatible with 802.11b/g/n simultaneous connections.
So is there some misconfiguration in my settings, or MT problem?



Re: 802.11n 2.4Ghz strange isues

Posted: Mon Nov 08, 2010 12:18 pm
by dejanb

I have some strange issues with Mini pci card TP-LINK TL-WN861N, when i change frequency, nobody connects!, i need to disable enable wireless card, turn on/off chains in HT tab, and then suddenly, everything is working, this only happens when changing frequency, i have the same problem, on the another two base stations...
I tried with another, same card, and upgraded to the latest version of ROS, still the same problem...


Re: 802.11n 2.4Ghz strange isues

Posted: Sat Aug 11, 2012 12:20 pm
by mjoksimovic
I had the same problem but problem solved with new 861N card revision. The problem used to be because of card hardware issues. Manufacturer solved this problem and now, the cards are working well.