Issue with 802.11n and my laptop

RouterOS Wireless Networking
1

I’m trying to figure out what is the problem with my setup, I’ve got RB 493g and 3X R2N cards, I’ve got one card set to be in my lan bridge, and no matter how I configure it I don’t get very much thruput, I’m trying to setup MiMo. My laptop is a Dell Studio Studio 1558 with a Dell Wireless 1520 Wireless-N WLan Mini-Card.

Here is a screen shot of my speeds.




Below is the config of the R2N wlan card.

/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no \
    antenna-gain=7 area="" arp=enabled band=2ghz-b/g/n basic-rates-a/g=6Mbps \
    basic-rates-b=1Mbps comment="" compression=no country="united states" \
    default-ap-tx-limit=0 default-authentication=yes default-client-tx-limit=\
    0 default-forwarding=yes dfs-mode=none disable-running-check=no disabled=\
    no disconnect-timeout=3s frame-lifetime=0 frequency=2412 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 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=1 hw-fragmentation-threshold=disabled \
    hw-protection-mode=none hw-protection-threshold=0 hw-retries=7 l2mtu=2290 \
    mac-address=00:0C:42:3A:B4:5F max-station-count=2007 mode=ap-bridge mtu=\
    1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=default \
    periodic-calibration-interval=60 preamble-mode=both \
    proprietary-extensions=post-2.9.25 radio-name=000C423AB45F rate-set=\
    default scan-list=default security-profile=Family ssid=forbes-family \
    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=enabled
/interface wireless manual-tx-power-table
set wlan1 comment="" manual-tx-powers="1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,\
    6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbps:17,54Mbps\
    :17,HT20-0:17,HT20-1:17,HT20-2:17,HT20-3:17,HT20-4:17,HT20-5:17,HT20-6:17,\
    HT20-7:17,HT40-0:17,HT40-1:17,HT40-2:17,HT40-3:17,HT40-4:17,HT40-5:17,HT40\
    -6:17,HT40-7:17"
2

try to push some real traffic FTP/HTTP/Torrents as the windows bandwidth test utility isn’t working so good in Windows.
You can try to enable the extension channel option if your client supports it.
Note, if you use wireless security on N network, use AES always (do not use TKIP as you will not get good speeds with TKIP in N networks).

3

HT-TX/RX 1,0
ftp: 52428800 bytes sent in 153.32Seconds 341.95Kbytes/sec.
ftp: 52428800 bytes received in 37.58Seconds 1395.27Kbytes/sec.

HT-TX/RX 0,0
ftp: 52428800 bytes sent in 127.62Seconds 410.82Kbytes/sec.
ftp: 52428800 bytes received in 35.78Seconds 1465.47Kbytes/sec.

4

If you have 2 antennas connected to the AP wireless card then try to use both chains to transmit/receive: ht-txchains=0,1 ht-rxchains=0,1
Also please upgrade to RouterOS v5.0rc10 and test again.
Check the registration table during the transfer to see what data-rates is it using to RX and TX.
Also after that you can try to enable the extension channel support.

5

Ok, I’ve got 5.0rc10 running now.

HT-TX 0,1 / RX 0,1 (Tried Extention Chan both above w/no change and below it dropped down to less then 30Kb )
##Per the Registration screen my connection is 130.0Mbps/130Mbps.
ftp: 25718484 bytes sent in 12.12Seconds 2122.86Kbytes/sec.
ftp: 25718484 bytes sent in 18.29Seconds 1406.38Kbytes/sec.
ftp: 25718484 bytes sent in 14.67Seconds 1753.13Kbytes/sec.
ftp: 25718484 bytes sent in 11.67Seconds 2203.25Kbytes/sec.
ftp: 25718484 bytes sent in 17.54Seconds 1466.69Kbytes/sec.
ftp: 25718484 bytes sent in 10.75Seconds 2392.86Kbytes/sec.
ftp: 25718484 bytes sent in 25.48Seconds 1009.56Kbytes/sec.
ftp: 25718484 bytes received in 14.14Seconds 1818.72Kbytes/sec.
ftp: 25718484 bytes received in 13.48Seconds 1907.62Kbytes/sec.
ftp: 25718484 bytes received in 13.38Seconds 1922.30Kbytes/sec.
ftp: 25718484 bytes received in 13.42Seconds 1916.14Kbytes/sec.
ftp: 25718484 bytes received in 13.25Seconds 1941.16Kbytes/sec.
ftp: 25718484 bytes received in 13.68Seconds 1880.14Kbytes/sec.
ftp: 25718484 bytes received in 13.39Seconds 1921.30Kbytes/sec.
avg send 15.78857143sec 1492.104286KB
avg rec 13.53428571sec 1901.054286KB



HT-TX 0 / RX 1
##Per the Registration screen my connection is 65.0Mbps/65Mbps.
ftp: 25718484 bytes sent in 27.03Seconds 951.48Kbytes/sec.
ftp: 25718484 bytes sent in 35.80Seconds 718.35Kbytes/sec.
ftp: 25718484 bytes sent in 26.27Seconds 979.08Kbytes/sec.
ftp: 25718484 bytes sent in 24.41Seconds 1053.39Kbytes/sec.
ftp: 25718484 bytes sent in 22.04Seconds 1166.79Kbytes/sec.
ftp: 25718484 bytes sent in 17.89Seconds 1437.43Kbytes/sec.
ftp: 25718484 bytes sent in 18.23Seconds 1410.39Kbytes/sec.
ftp: 25718484 bytes received in 15.28Seconds 1682.93Kbytes/sec.
ftp: 25718484 bytes received in 15.47Seconds 1662.26Kbytes/sec.
ftp: 25718484 bytes received in 15.29Seconds 1682.05Kbytes/sec.
ftp: 25718484 bytes received in 15.08Seconds 1705.47Kbytes/sec.
ftp: 25718484 bytes received in 15.05Seconds 1709.44Kbytes/sec.
ftp: 25718484 bytes received in 14.91Seconds 1724.92Kbytes/sec.
ftp: 25718484 bytes received in 15.17Seconds 1695.58Kbytes/sec.
avg send 24.52429sec 1102.416KB
avg rec 15.17857sec 1694.664KB



HT-TX 0 / RX 0
##Per the Registration screen my connection is 65.0Mbps/52Mbps.
ftp: 25718484 bytes sent in 13.63Seconds 1886.63Kbytes/sec.
ftp: 25718484 bytes sent in 12.99Seconds 1979.11Kbytes/sec.
ftp: 25718484 bytes sent in 13.28Seconds 1936.78Kbytes/sec.
ftp: 25718484 bytes sent in 12.58Seconds 2044.23Kbytes/sec.
ftp: 25718484 bytes sent in 12.84Seconds 2003.47Kbytes/sec.
ftp: 25718484 bytes sent in 10.45Seconds 2460.63Kbytes/sec.
ftp: 25718484 bytes sent in 13.01Seconds 1976.37Kbytes/sec.
ftp: 25718484 bytes received in 15.24Seconds 1687.12Kbytes/sec.
ftp: 25718484 bytes received in 15.63Seconds 1645.04Kbytes/sec.
ftp: 25718484 bytes received in 15.25Seconds 1686.79Kbytes/sec.
ftp: 25718484 bytes received in 17.58Seconds 1462.69Kbytes/sec.
ftp: 25718484 bytes received in 16.30Seconds 1577.92Kbytes/sec.
ftp: 25718484 bytes received in 15.28Seconds 1682.82Kbytes/sec.
ftp: 25718484 bytes received in 16.23Seconds 1584.82Kbytes/sec.
avg send 12.68286sec 2041.031KB
avg rec 15.93sec 1618.171KB

HT-TX 0,1 / RX 0,1 Best Receive
HT-TX 0 / RX 1
HT-TX 0 / RX 0 Best Send


So my question’s are

  1. why isn’t HT-TX 0,1 / RX 0,1 the best in both send and rec not just rec?
  2. why am I only getting 19.59Mb Rec and 15.74Mb when my connection rate is 130Mb? (The computer I was doing the speed test to is wired via a Gb lan card and the drives are in a raid5).
  3. is this the best I can get?

I also ran the MT bandwidth test tool again and this is the new screen shot.

I let it run for a little while and it dropped off… Anybody know why??? ( I didn’t do anything on the computer to cause it…)

6

Ht-extension channel above control should only be working as you are using 2412mhz.
When you used the above control what data-rates you saw?
Have you tried to use different frequencies?
Please write to support with the support output file included during the transmit.
About the 0,1 chain configuration, change the antenna polarization on one of the antennas and try again.

7

The rates I posted were with the control channel set to “above”

I just tried all the frequencies and saw no major change either way.

Supout.rif email into support.

Ok, I find no option for changing the polarization, and after searching the forms I couldn’t find the instructions. How do I change it?

8

Any body have any idea’s?