hi guys!
We have reached ~95/100 Mpbs full duplex wireless speed on r52n+rb433ah (udp test, data rate fixed, MCS 1,7,8,14,15), 270HT/270HT radio speed, anyone interested - i can post screenshots or settings for this mode, but have some troubles:
iperf test (or direct download) from one side to other topped max by 31-33 Mbps through next scheme: ETH(RB433AH-1)-----R52n<----->R52n------ ETH1(RB433AH-2) same as bridging mode and routing mode; but at the same time tcp test from one r52n to other rated by 40~90Mbps. is it routerboard issue(at downloading - cpu av.15-45%)? anyone can test similar configuration for max throughput??

routerOS v.4b3, nstreme disabled,wds disabled, periodic calibration disabled, ap+pseudobridge mode.

can you port the information on the antennas you used to do this as i have done many tests with tcp but the antennas made a big diffrence


and some screen shots would be nice to have

this test was performed "on the table" by sticking up on 1-5mm pigtails from both r52n cards, screenshots i can post some time later. other question - why bypass speed of radio at 100Mbps real wlan---eth throughput value top ONLY 30-32 Mbps. At the same time iperf test from one eth to other in bridge rates connection at 50-54 Mpbs. Is it RB433AH max perfomance?!

hello guys, after reading all the posting in this thread, i decide to test 802.11n.
my r52n had just arrive yesterday, so today i want to configure my RB411 and RB433.
i will post the result after i finish configuring the board.

Encouraged by this thread, i purchased 2 R52N and 2 RB411AH to make a 802.11n link and see his throughput.
The antennas are 2 flat panel 10° 23dbi with different polarization (H and V).
I established a working and 100% stable link with those parameters This is live traffic, not bwtest. If i enable other HT MCS, the link goes instable and CCQ drops to 3%. Can anyone explain me why it happens? I just don't get it..

Encouraged by this thread, i purchased 2 R52N and 2 RB411AH to make a 802.11n link and see his throughput.
The antennas are 2 flat panel 10° 23dbi with different polarization (H and V).
I established a working and 100% stable link with those parameters

Code: Select all

/interface wireless security-profiles
set default authentication-types="" eap-methods=passthrough group-ciphers="" group-key-update=5m interim-update=0s management-protection=disabled management-protection-key="" mode=none name=default \
    radius-eap-accounting=no radius-mac-accounting=no radius-mac-authentication=no radius-mac-caching=disabled radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username static-algo-0=none static-algo-1=none \
    static-algo-2=none static-algo-3=none static-key-0="" static-key-1="" static-key-2="" static-key-3="" static-sta-private-algo=none static-sta-private-key="" static-transmit-key=key-0 supplicant-identity=\
    MikroTik tls-certificate=none tls-mode=no-certificates unicast-ciphers="" wpa-pre-shared-key="" wpa2-pre-shared-key=""
/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-onlyn basic-rates-a/g="" basic-rates-b="" comment="" compression=no country=\
    italy 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=5520 \
    frequency-mode=manual-txpower hide-ssid=no ht-ampdu-priorities=0,1,2,3,4,5,6,7 ht-amsdu-limit=8192 ht-amsdu-threshold=8192 ht-basic-mcs=mcs-0,mcs-2 ht-extension-channel=above-control ht-guard-interval=any \
    ht-rxchains=0,1 ht-supported-mcs=mcs-0,mcs-2 ht-txchains=0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=15 mac-address=00:0C:42:3A:CF:42 max-station-count=2 \
    mode=bridge mtu=1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=short proprietary-extensions=post-2.9.25 radio-name=wlanN rate-set=\
    configured scan-list=default security-profile=default ssid=SagittarioVinci station-bridge-clone-mac=00:00:00:00:00:00 supported-rates-a/g="" supported-rates-b="" tx-power=4 tx-power-mode=all-rates-fixed \
    update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic wmm-support=disabled
/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,HT20-1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-\
    7:0,HT20-8:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40-7:0,HT40-8:0"
/interface wireless nstreme
set wlan1 comment="" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3998 framer-policy=best-fit
/interface wireless align
set active-mode=yes audio-max=-20 audio-min=-100 audio-monitor=00:00:00:00:00:00 filter-mac=00:00:00:00:00:00 frame-size=300 frames-per-second=25 receive-all=no ssid-all=no
/interface wireless sniffer
set channel-time=200ms file-limit=10 file-name="" memory-limit=10 multiple-channels=no only-headers=no receive-errors=no streaming-enabled=no streaming-max-rate=0 streaming-server=0.0.0.0
/interface wireless snooper
set channel-time=200ms multiple-channels=yes receive-errors=no

This is live traffic, not bwtest.

n1.jpg

If i enable other HT MCS, the link goes instable and CCQ drops to 3%. Can anyone explain me why it happens? I just don't get it..

Hi Rena!
Your tx-power is set to 4, is it a real link or a lab one? I had good performances only in default.
Try starting with ht-extension-channel=none. Nstreme framer policy = dynamic-size, too. Best-fit 3998 maybe is too high.

Ciao Alessandro,
It's real link, but they are really close so i had to lower a little the tx power.. anyway today i set up another link with the same configuration, but with default power.
it's the same...
Maybe should i aim for a dual pol dish antenna? or the 2 parallel antennas are good enough?

With RB411AH and R52N connected to a dual polarized 5GHz 23dbi antenna we are getting 85 Mbps real combined TCP traffic across 600m without Nstreme and using 40 MHz.

This IS better than turbo mode with 802.11a.

Hello,

I have 2 RB600's with R52N set up about .5 miles (.8 km) apart. Using a set of Dual Pol Poynting antennas http://www.poynting.co.za/productdispla ... 8&cat_id=3 I've read and tried different wireless configurations, I just can't seem to get the throughput others have in this post. Any help is appreciated.

Here is the config on one end: Here is the wireless monitor while running bandwidth test Here is the config on the other end: Here is the wireless monitor on this end while running bandwidth test: Bandwidth test Screenshot

RK

can you post a link to the dual polarized 5GHz 23dbi antenna
thant you used thanks man

RK

can you post a link to the dual polarized 5GHz 23dbi antenna
thant you used thanks man

http://antennas.com/products.php?id=217&cat=169

If using as an AP is it best to use one antenna V-pol and the other H-pol, or both the same side-by-side?
What about if in a backhaul configuration (i.e. point-to-point); use dual-pol dishes, or 2 of same pol side-by-side?

samcarney, try using UDP, the RB600 isn't too powerfull to generate so much TCP traffic. Or put some x86 boxes or RB1000 to RB600 ethernet to generate the TCP traffic and test again.

About encryption, try using only AES, do not use TKIP as it isn't working good at full speed.

I would be great if the first people to test the new 802.11n support in RouterOS v4 beta 3 would post their experiences here in this thread.

Anyone who will post some 802.11n wiki tutorial with images and setup configurations that work with good speeds, will get a Level6 license from me

RouterOS 4.0Beta3 on Intel Dual Core 2.2Ggz + 1 GB DDR2 800 Mhz + R52N card (with 2 antennas, 1 horizontally polarized and 1 vertically polarized )tested on 2.4 Ghz with Amd X2 Dual Core 5000+ 2 GB DDR2 800 Mhz + Trend Net TEW 624UB Wireless N USB card on Win Xp.

Result 20 Mbs for one way transfer and 10Mbs + 10 Mbs in full duplex. Theese are real speeds, as testing was done copying some video files in the same network.

Same RouterOS configuration tested with Acer Dual Core Notebook + Intel 5100 WiFi Mini PCI Card. When RouterOS transmited in 2.4Ghz b/g/n the laptop could not connect (Tested with a Sony Vaio laptop, can't remember the wifi card, it saw the wireless but as it had no signal, even if equipments were in the same room). After deactivating N, so transmiting with B/g, Acer SOMETIMES managed to connect (Sony Managed to prompt that it had signal but didn't connected). I tryed with WPA encription and also without any encription.

Anyone who will post some 802.11n wiki tutorial with images and setup configurations that work with good speeds, will get a Level6 license from me

Give away some hardware! All I buy comes with the licenses already. No fun in getting a L6 key if I already have.....

RouterOS v4.0beta4 has a new wireless driver which should be working better for 802.11n.
Periodical calibration should be working now.
Please share your updates/results on your N links after upgrade to new version.

RouterOS v4.0beta4 has a new wireless driver which should be working better for 802.11n.
Periodical calibration should be working now.
Please share your updates/results on your N links after upgrade to new version.

TX-Power readings are improved now. But I do not understand them
11N,2 Chains,Antenna Gain 13,Country=germany: TX-Power=8, Real TX-Power=8, Total TX-Power=11
11N,1 Chains,Antenna Gain 13,Country=germany: TX-Power=14, Real TX-Power=14, Total TX-Power=14

So when Total TX-Power is the sum of both channels why is Total TX-Power only 11 when using
2 Channels? I would expect:
11N,2 Chains,Antenna Gain 13,Country=germany: TX-Power=11, Real TX-Power=11, Total TX-Power=14

What is the difference between TX-Power and Real-TX-Power?

Stefan

have you specified frequency-mode=regulatory-domain?
when you use 2 chains together you can add 3db and you will get the total output power.
TX-Power and Real-TX-Power is different if the wireless card uses some offset of tx-power (like some ubiquity wireless cards).

have you specified frequency-mode=regulatory-domain?
when you use 2 chains together you can add 3db and you will get the total output power.
TX-Power and Real-TX-Power is different if the wireless card uses some offset of tx-power (like some ubiquity wireless cards).

Yes:
[admin@ct1] > interface wireless print advanced
Flags: X - disabled, R - running
0 name="wlan1" mtu=1500 mac-address=00:0C:42:3A:D1:AD arp=enabled
disable-running-check=no interface-type=Atheros 11N
radio-name="ct1-wlan1" mode=ap-bridge ssid="test" area=""
frequency-mode=regulatory-domain country=germany antenna-gain=13
frequency=5600 band=5ghz scan-list=5500,5600 rate-set=default
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,
54Mbps
basic-rates-b=1Mbps basic-rates-a/g=6Mbps max-station-count=2007
ack-timeout=dynamic tx-power-mode=default periodic-calibration=default
periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a
wds-mode=disabled wds-default-bridge=none wds-default-cost=100
wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0
default-client-tx-limit=0 proprietary-extensions=post-2.9.25
wmm-support=disabled hide-ssid=no security-profile=test
disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=both
compression=no allow-sharedkey=no
station-bridge-clone-mac=00:00:00:00:00:00
ht-ampdu-priorities=0,1,2,3,4,5,6,7 ht-guard-interval=any
ht-extension-channel=disabled
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-basic-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-7
ht-txchains=0 ht-rxchains=0,1 ht-amsdu-limit=8192
ht-amsdu-threshold=8192 hw-retries=4 frame-lifetime=0
adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0

the new wireless driver uses the Band Edge Power from the cards EEPROM and that is why the output power could be lower.
We will check if everything is working correctly or not.

My results on the test bed, ros 4b4, tested on RB-600A, cpu +- 30%, generating packet from rb, not from other machines in ethernet port, i dont know that is rb 600 bug or my ethernet card bug, but if i testing from my pc to the rb600 or throught rb600 then i dont chieve speed higer than +- 230 mbit/s

Got another test from mine as well, first one had some spare antennas of different gain db, now changed to all the same.

Updated the wiki guide to include this image.

Omega-00,

If you reduce your Signal strength to values around -40 ~ -50dBm, you will get better CCQs profiles.

Cheers
Guilly

I have a 4.5 mile link I set up for testing. I have -69 signal strength and tried all the settings in the wiki but am only able to get about 18 megs throughput UDP. I suspect noise but I have 2 adjacent clear channels I am using. I am using dual polarized antennas on each end. Any ideas?

Be careful upgrading to 4.0b4. I lost a link doing this. Appears to be something to do with noise immunity. Others have had similar problems. When I can get the far side and shut that off, I'll post whether that fixed it. Link comes up for only a second or so then gets lost.

Shutting off Adaptive Noise Immunity on both ends helped get things back up.

We have a working configuration up to 5-7Miles using dual pol antenna - we are offering a PTP Kit solution all ready assembled if anybody is interested - dan@hiflywireless.com

11.3km link 2x2 connection with r52n and rb600a.

Here is config of AP:

/interface wireless security-profiles
set default authentication-types="" eap-methods=passthrough group-ciphers="" group-key-update=5m interim-update=0s management-protection=disabled \
management-protection-key="" mode=none name=default radius-eap-accounting=no radius-mac-accounting=no radius-mac-authentication=no radius-mac-caching=\
disabled radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username static-algo-0=none static-algo-1=none static-algo-2=none static-algo-3=none \
static-key-0="" static-key-1="" static-key-2="" static-key-3="" static-sta-private-algo=none static-sta-private-key="" static-transmit-key=key-0 \
supplicant-identity=MikroTik tls-certificate=none tls-mode=no-certificates unicast-ciphers="" wpa-pre-shared-key="" wpa2-pre-shared-key=""
/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-a/n \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps comment="delta_glodjevo AP" compression=no country="south africa" 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=\
5240 frequency-mode=manual-txpower hide-ssid=no ht-ampdu-priorities=0,1,2,3,4,5,6,7 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=below-control ht-guard-interval=any ht-rxchains=0,1 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=0,1 hw-fragmentation-threshold=disabled \
hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:D6:12 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=000C423AD612 rate-set=default scan-list=default security-profile=default ssid=delta_glodjevo 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=static wmm-support=enabled
/interface wireless manual-tx-power-table
set wlan1 comment="delta_glodjevo AP" manual-tx-powers="1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbp\
s:17,54Mbps:17,HT20-0:0,HT20-1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40\
-7:0"
/interface wireless nstreme
set wlan1 comment="delta_glodjevo AP" disable-csma=yes enable-nstreme=yes enable-polling=yes framer-limit=3998 framer-policy=best-fit
/interface wireless wds
add arp=enabled comment="" disabled=no l2mtu=2290 master-interface=wlan1 mtu=1500 name=glodjevo-wds wds-address=00:0C:42:3A:D4:99
/interface wireless align
set active-mode=yes audio-max=-20 audio-min=-100 audio-monitor=00:00:00:00:00:00 filter-mac=00:00:00:00:00:00 frame-size=300 frames-per-second=25 \
receive-all=no ssid-all=no
/interface wireless sniffer
set channel-time=200ms file-limit=10 file-name="" memory-limit=10 multiple-channels=no only-headers=no receive-errors=no streaming-enabled=no \
streaming-max-rate=0 streaming-server=0.0.0.0
/interface wireless snooper
set channel-time=200ms multiple-channels=yes receive-errors=no
[marian@GL0] /interface wireless> wds
[marian@GL0] /interface wireless wds> export
# jan/04/1970 20:01:49 by RouterOS 4.0beta4
# software id = YHQT-I1PV
#
/interface wireless wds
add arp=enabled comment="" disabled=no l2mtu=2290 master-interface=wlan1 mtu=1500 name=glodjevo-wds wds-address=00:0C:42:3A:D4:99

Here is config of client:

/interface wireless security-profiles
set default authentication-types="" eap-methods=passthrough group-ciphers="" group-key-update=5m interim-update=0s management-protection=disabled \
management-protection-key="" mode=none name=default radius-eap-accounting=no radius-mac-accounting=no radius-mac-authentication=no radius-mac-caching=\
disabled radius-mac-format=XX:XX:XX:XX:XX:XX radius-mac-mode=as-username static-algo-0=none static-algo-1=none static-algo-2=none static-algo-3=none \
static-key-0="" static-key-1="" static-key-2="" static-key-3="" static-sta-private-algo=none static-sta-private-key="" static-transmit-key=key-0 \
supplicant-identity=MikroTik tls-certificate=none tls-mode=no-certificates unicast-ciphers="" wpa-pre-shared-key="" wpa2-pre-shared-key=""
/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-a/n \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps comment="delta_glodjevo cl" compression=no country="south africa" 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=\
5240 frequency-mode=manual-txpower hide-ssid=no ht-ampdu-priorities=0,1,2,3,4,5,6,7 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=below-control ht-guard-interval=any ht-rxchains=0,1 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=0,1 hw-fragmentation-threshold=disabled \
hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:D4:99 max-station-count=2007 mode=station-wds mtu=1500 \
name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=both proprietary-extensions=post-2.9.25 \
radio-name=000C423AD499 rate-set=default scan-list=default security-profile=default ssid=delta_glodjevo 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="delta_glodjevo cl" manual-tx-powers="1Mbps:17,2Mbps:17,5.5Mbps:17,11Mbps:17,6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:17,48Mbp\
s:17,54Mbps:17,HT20-0:0,HT20-1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40\
-7:0"
/interface wireless nstreme
set wlan1 comment="delta_glodjevo cl" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=none
/interface wireless align
set active-mode=yes audio-max=-20 audio-min=-100 audio-monitor=00:00:00:00:00:00 filter-mac=00:00:00:00:00:00 frame-size=300 frames-per-second=25 \
receive-all=no ssid-all=no
/interface wireless sniffer
set channel-time=200ms file-limit=10 file-name="" memory-limit=10 multiple-channels=no only-headers=no receive-errors=no streaming-enabled=no \
streaming-max-rate=0 streaming-server=0.0.0.0
/interface wireless snooper
set channel-time=200ms multiple-channels=yes receive-errors=no

UDP traffic is ~150/160Mbps
TCP real traffic is ~100/120Mbps

11.3km link 2x2 connection with r52n and rb600a.

Could you give us the antenna model and manufacturer ?


thanks,

kabelfrei

promind!


GOOD QUESTION ID THINK WHAT BETA VERSION DID YOU USE TO GET THIS

AS MANY PEOPLE THNIK THERE ARE MANY BUGS IN THE NEW BETA VERSION

Hello, just to share my experiences of 802.11n MT flavour:

I setup a 17 mile link between an island and mainland using dual pol 29db dishes.

So far I have managed to get 80mbps real world traffic with around -61db signals , but I think I can improve soon but having so many association and privacy errors it's almost impossible to get a stable connection to test.

I feel that there is alot of problems (which simply do not exist on 11a mode) with the drivers and software right now preventing it's useage and proper testing on anything else than a lab test.

1/ loads of WPA2 errors often means it just wont associate even with good signals without rebooting remote units

2/ Problems with auto rate seem to be really bad over distance. Fixing rates and disabling every feature of the card helps and I need to play more in this area.

I feel good and quite exited about its possibilities though and am looking forward to further releases.

Hello, just to share my experiences of 802.11n MT flavour:

I setup a 17 mile link between an island and mainland using dual pol 29db dishes.

So far I have managed to get 80mbps real world traffic with around -61db signals , but I think I can improve soon but having so many association and privacy errors it's almost impossible to get a stable connection to test.

I feel that there is alot of problems (which simply do not exist on 11a mode) with the drivers and software right now preventing it's useage and proper testing on anything else than a lab test.

1/ loads of WPA2 errors often means it just wont associate even with good signals without rebooting remote units

2/ Problems with auto rate seem to be really bad over distance. Fixing rates and disabling every feature of the card helps and I need to play more in this area.

I feel good and quite exited about its possibilities though and am looking forward to further releases.

would you mind to share where you got that antenna?
It's sound interesting..

O.k. I tested N with Beta4 (extension channel without nstream) in the lab. BW test with UDP is looking as it should. Air rates and quality are looking fine. If I test TCP (Traffic generator ist RB1000 and PC) I see only 29 MBit HDX. Who has the same problem? Who has an solution or a workaround for that?

Hello, just to share my experiences of 802.11n MT flavour:

1/ loads of WPA2 errors often means it just wont associate even with good signals without rebooting remote units

It's sound interesting..

Why not go to aes, as it's built into the card?

promind!


GOOD QUESTION ID THINK WHAT BETA VERSION DID YOU USE TO GET THIS

AS MANY PEOPLE THNIK THERE ARE MANY BUGS IN THE NEW BETA VERSION

4.0b3(first) 4.0b4 now
Antenas are from VOM - Varna, Bulgaria 120sm.

any ideas on dual polarized dish vs dual polarized panel?

I would be great if the first people to test the new 802.11n support in RouterOS v4 beta 3 would post their experiences here in this thread.

Anyone who will post some 802.11n wiki tutorial with images and setup configurations that work with good speeds, will get a Level6 license from me

Normis I am very keen on this. I need more speed as the normal stuff is getting to slow. You let me know and I have no prob in testing it ( grassie)

here is my setup without nstreme and periodic calibration disabled.With nstreme enabled, link is disconnecting all the time.
hardware used: 2xRB433AH , 2xR52N , 23dBi dual panel, on other side 28dBi dual dish.
RouterOS:4.0beta4
link distance: 9km I getting only 25 Mbps HDX and 12Mbps FDX (TCP test) in best case.I am very disappointed, for now.

Be careful upgrading to 4.0b4. I lost a link doing this. Appears to be something to do with noise immunity. Others have had similar problems. When I can get the far side and shut that off, I'll post whether that fixed it. Link comes up for only a second or so then gets lost.

MANY THANKS !

demopro, try using default rate-set configuration, looks like the links isn't working so well in the highest data-rates.
what is your antenna configuration?

I tried all combinations of ht-basic-mcs / ht-supported-mcs and rate-set=default, but without results.
One side is antenna 28,5 dual polarized parabolic, on other side is 24dBi Dual Polarity Panel Antenna (MARS).
Configuration on both sides is antenna-mode=ant-a ,antenna-gain=0.

contact the support@mikrotik.com and include the support output files from both routers.

Is it worth wile trying the upgrades. The problem I am having is the normal support levels. I don't want to upgrade running systems to a beta system as I can not afford down time.

The R52n is that supported at all on the ver 3 platform?

I tried on ver 3.28 but it does not detect the radio. So other than playing with it at home is it worth while upgrading?

only v4.0beta versions supports N cards

only v4.0beta versions supports N cards

We have a working configuration up to 5-7Miles using dual pol antenna - we are offering a PTP Kit solution all ready assembled if anybody is interested - dan@hiflywireless.com

Can you please share us with your settings? That's more appropriate hen giving your sales contact.
You learn from this forum, let the forum learn from you.

only v4.0beta versions supports N cards

but not supported DNS

check if you can open the www.mikrotik.com from the Internet Explorer.

check if you can open the http://www.mikrotik.com from the Internet Explorer.

working..

Can we get a confirmation from Mikrotik on a few things on 4.0b4?

1. Is nstreme polling working with N?

2. Adaptive noise immunity - that is not working, correct?

3. WDS / non-wds - what works and what doesn't? Workarounds?

Thanks!

Randy

Can we get a confirmation from Mikrotik on a few things on 4.0b4?

1. Is nstreme polling working with N?

2. Adaptive noise immunity - that is not working, correct?

3. WDS / non-wds - what works and what doesn't? Workarounds?

Thanks!

Randy

my experience:
1. Nstreme is not working good, very low speed
2. ANI is not working on b4
3. WDS / non WDS works fine

regards
Ros

Nstreme is not so optimized for the N links yet.
ANI will be fixed in the next release of the v4.beta
WDS is also working with N cards, but you will not get the full speed as some packet combining features of the N isn't working with WDS. So if you want the full speed, use EOIP or MPLS instead of WDS.

when the new beta will be released?

regards
Ros

screw that, we'll see it.

I'm mostly interested in any approximates when nstreme will be fully working with N mode and Uldis, if you can share some details about problems caused by new N mode... it might be interesting technical insight for us, your customers. I don't think you will reveal anything to your competitors because they either have their own protocols (and they are fighting already with the similar problems you have) or they don't have anything and that info will not help them us at all.

just curious what is the complication for nstreme... it must be PainInTheAss, my understanding is that you're probably going to rewrite it basically from scratch.

Guys, I see a lot of great 802.11n links here with good performance, maybe somebody here wishes to do a 802.11n workshop/presentation at the MUM in USA in 2 weeks? Probably some of you are coming anyway. You could just show how you configured your routers, what equipment you used, what were the circumstances etc.

Hi Guys!

I am in need of some help.

I have previously setup a test link with a 2 x R52 Wireless cards and 2 x 433AH Routerboards with a TCP throughput of 70mb/s TCP with FTP file transfer between 2 laptops. I recently received 2 x R52N card and was very exited about the the possible thoughput.

I have setup a link using 2 x dipoles, 2 x R52N Wireless cards and 2 x 433AH Routerboards. After some testing i got the link throughput upto 63mb/s TCP using the onboard bandwith test. The CPU was running at 100% so i then moved to a FTP file transfer between 2 Laptops.

The results fluctuated between 20mb/s and 33mb/s. Could anyone shed some light on possible problem?

I have checked that antivirus and firewall are turned off.

Cheers

Can anybody tell me if these should be used in increasing order, or every setting has its own working?

For instance, will selection only "1" or only "7" have the same effect or are they different?
Can I use setting at random (like 2,4,5,7) or do you need to build up in order (like first 1 then 1,2 then 1,2,3 etc.) when fine tuning?

Not that I notice any difference so far but I don`t see differences on some other "n" config settings neither where others definitely claim they have.
Please some input in this...

Does anyone have experience with two R52N cards in one routerboard?

I have two setups.

One 10 mtr test link with 2 rb433AH, one r52n card each on a dual polarized 23dBi antenna (power tuned down) and apart from some finetuning I already got over 200Mb (udp, board to board) speeds and 30-50Mb tcp.

I made one real live link (600 meters) with exactly the same hardware in same area (rougly the same noise environment around, but noise levels are around -100) and power brought back to 6dBm on both ends. Signals both ends still in the -50, -55dBm range (not very stable though) and CCQ around 80%. S/N ratios in the 60's)
But both boards show the TX rate around 250-300Mbps-HT after some 5-10 mins while at the same time BOTH boards show Rx rates rarely higher then 6Mbps!

There are some other 5Ghz radio's in the area but freq. scan showed my used freq. is actual free on both ends.
I don't understand why both ends take lots of time to build up the TX Rate while the Rx Rate hardly ever goes higher then 6Mbps!

I tried sort of all possible settings in the wireless config but I can't get the link to work. Traffic won't even run over it. Try to run a bandwidth test and the link even breaks.
The only difference with this ´real world´ link compared to my test setting is that both ends have a second R52N card in a slot for later use to extend the backhaul. But these cards are disabled so should basically not have any influence.

Any suggestions are desperately needed. I spend now 5 days trouble shooting, reading this forum and the wiki but don't seem to be able to get a normal working ´n´ link working. It's driving me crazy and although I have all confidence in the possibility of the "n" cards I feel at times like throwing the whole lot out of my window!

WirelessRudy, what do you see in the log files when the link disconnects?
Why are you lowering the power so much?
Are you using nstreme?
Have you tried to run only A band to test before using N band?
Contact the support with the support output file attached.
About the rate selection, it is like with the regular band.

dalejoyce, what configuration you had on the boards?
Contact the support with the support files attached of your links? also try to use the regular band first to check if you can get the same speed like with the regular cards.

don't forget to enable Debug Logs and see the detailed reasons in the log

WirelessRudy, what do you see in the log files when the link disconnects?
Why are you lowering the power so much?
Are you using nstreme?
Have you tried to run only A band to test before using N band?
Contact the support with the support output file attached.
About the rate selection, it is like with the regular band.

dalejoyce, what configuration you had on the boards?
Contact the support with the support files attached of your links? also try to use the regular band first to check if you can get the same speed like with the regular cards.

Some quick answers, later today the rest follows, I hope..

- Log: don't know yet, just enable debug mode.
- lowering the power: with these 23dBm antennas with default setting I get -16dBm! I have been reading elsewhere the advice to try to get signal levels in area around -50 - -60. To stay with reg. domain later I have to go to minimal setting anyway.
- nstreme: No. Nstreme is not be best solution for low use but ´live traffic´links. Plus its been said in this forum and elsewhere Nstreme is not ready with "N" protocol
- A-band. With these "N" cards? Tried to use one of the ends to connect to a same distance A-band running device. Although signal was -60 link was also very unstable. I got better result with same link between two antenna's that both only have -80dBm signal from the eachother ends.... So dropped the A-band option since it looks like the "N" cards don't work very well with it.
But I can try again.
- Probably am I forced to change all "N"-cards today for normal cards anyway to see if at least a normal link can be set up. Have to climb the towers though and after all, when that works, I am only back to START regarding the "N" card. Isn't it?
- supout.rif: Will try to do that today. But on this moment I can't even reach my n-station anymore. Only by mac through the wireless link and how do I get the supout.rif in my Pc this way?

Give you guys more info later today.

I have been testing wireless N over a link between two rb411's with R52N cards. I have found that with btest running from computer to computer through the N link I can ever only get 27MB throughput. I looked at settings (like max connections) in btest and no matter what I changed differing results...

Then for fun I transferred a file via file share between the two and was able to see almost 70MB for the file. Does btest have a problem or do I have something setup incorrectly?

Scott

I have been testing wireless N over a link between two rb411's with R52N cards. I have found that with btest running from computer to computer through the N link I can ever only get 27MB throughput. I looked at settings (like max connections) in btest and no matter what I changed differing results...

Then for fun I transferred a file via file share between the two and was able to see almost 70MB for the file. Does btest have a problem or do I have something setup incorrectly?

Scott

Most likely you were doing TCP Bandwidth test which generates a lot of CPU usage and RB can't generate so much traffic, that is why you need to make the bandwidth test through the boards and generate the TCP from a PC or RB1000.

I have been testing wireless N over a link between two rb411's with R52N cards. I have found that with btest running from computer to computer through the N link I can ever only get 27MB throughput. I looked at settings (like max connections) in btest and no matter what I changed differing results...

Then for fun I transferred a file via file share between the two and was able to see almost 70MB for the file. Does btest have a problem or do I have something setup incorrectly?

Scott

Most likely you were doing TCP Bandwidth test which generates a lot of CPU usage and RB can't generate so much traffic, that is why you need to make the bandwidth test through the boards and generate the TCP from a PC or RB1000.

Uldis, he said:

Then for fun I transferred a file via file share between the two

All tests were from pc to pc through link

I'm suggesting windows btest program has problem not the link but that is bad because lots of people use it and many have said they can't get more than 27 mb or so throughput.

Just wanted to bring this to your attention I had thi problem on 4 different computers with good hardware

Now we are commenting MT's bandwith test:

If running the setting of "Remote Tx Speed" field is meaningless. No matter what I fill in here, I get the same speed in ´recieve -Direction¨.
Even if I fill in 10bps, traffic still comes in with the line max. for instance 3Mb!

On several client CPE (all Mt off course) I can run (unlimited, see above) speed tests and they show the speed I'd expect, but when ´direction´ is choosen as "both" I get hardly any speed, or only download. Counter for upload doesn't even move. (this could be because upload is not possible because download consumes all capacity, but when I then start playing with the speed limiter to make ´both´ direction speed reading possible I get values that are very unstable and usually very slow...

On some clients I cannot run a tcp test to a server while udp runs. Then from another client on the same AP in the same network (only its own IP is different) both works fine. Sometimes it does work fine just a little later.

Sometimes bandwith tools just shows "test not permitted" and 5 mins later it has no problem running the same test.

My experiance with the tool is that it is a great tool but not always working the way it should or stable. Maybe MT should take a close look into the routines and programming of the tool.

The (windows) desktop version is actually better with the option to save some specific test parameters, but every new test opens a new test without closing the previous one. Since is sometimes opens its window over the previous test user is not always aware it does open and run not two (or three, four or five) test.

We have poor results on the Windows version of bandwidth test. Better results on the newer Routerboard-based bandwidth tests.

For really good results we are now using jperf for Windows-to-Windows bandwidth testing, with at least 10 TCP streams. http://code.google.com/p/xjperf/

Decent little how-to here: http://ubnt.com/forum/viewtopic.php?t=14114
This will also let you compare your 11n results with the new UBNT product line...
George

I have a 32km link with 32dbi dual pol. antenna (http://www.l-com.com/item.aspx?id=22100), the signal level is around -58dBm, and the noise level is from -112 to -115dBm in some channel, HT Chains 0 and 1 selected. I test it with many channels configurations (from 5000Mhz to 6000Mhz, I have a superchannel license), and many HT AMPDU Priorities, but the link with no traffic is very unstable, I frequently receive disconnect from remote side, with message "extensive data lost".

When I move for some other channels (5865, 5805, 5700Mhz for example) the link it seems stable, the bitrate goes to 130Mbit/s. When I start the UDP throughput test in half direction the speed reached its about 90mbit/s, but when I select bi-direction test, the bitrate down to 6Mbit/s, and the link again turns unstable, receiving disconnect. With TCP test the problem its same, but it occurs in half direction test.

This link is running without WDS (AP Bridge and Station config in local and remote side), without Bridge (running in routing mode and without Nstreme. The periodic calibration its default, but I also tried disabled.

Any sugestion?

Try to use first only one chain and make the test and get that link stable working at max speed. then enable extended channel support to use 2 20mhz channels and try to get the max speed.
After that try the same with the other chain.
If everthing works, you can try to enable both chains at the same time. If that fails (unstable link) it means that the dual pol. antenna has some problems - interfernece between the both chains. If you have an option - try to use seperate antennas.

Thank you. I will try to use separeted antennas.

Anyone know the cross-pol isolation of L-COM HG5158DP-32D?

I had the same problems with almost the same antenna (other manufacturer, but the same feed).
Both the manufacturers claim that isolation is above 28dB.
If anyone has positive experience with dual pol. antennas?

My success story with 802.11n

Config:

RB411AH on both sides L4+XC
R52N on both sides
Power supply 27,6V 3A on both sides
Antennas with box:
http://www.netbridge.com.pl/produkty/mt ... ntegrated/
Technical specs:
http://www.netbridge.com.pl/wp-content/ ... 20Dual.pdf
Used freq: 5500MHz with control channel: Above
Disabled ANI
Disabled Periodic Calibration
Disabled Nstreme
EoIP used to bridge them


Situation:
Distance: 6.11 km
Loads of 5GHz networks (802.11a standard)

http://odsiebie.com/pokaz/5086025---95a8.html

Score:
At the moment the link in "rush hours" pushing around 30Mbit/10Mbit with pind bellow 10ms.
I've tested with BT when real traffic was on.

http://odsiebie.com/pokaz/5086004---86f2.html

35km success!!!
2x2 SR71A.
So now I have stable ~50km link with 90Mbps-SD traffic.
35km SR71A - 117/117 - real traffic is 87/88Mbps tcp with a pair of intel core2duo "junkboxes" x86 and 2x2 connection.
11.4km R52N - 270/270 - real traffic is 140Mbps tcp with a pair RB600A and 2x2 connection.

Try to use EOIP or MPLS(VPLS) instead of WDS and you will get even better speed.

promind, which antenna you are using in your 35km link?

a pair of 120sm. Parabolics.

To uldis - EoIP shows very very low performance( from 90Mbps to 25/30Mbps ) - WDS seems to work better for now.

a pair of 120sm. Parabolics.

To uldis - EoIP shows very very low performance( from 90Mbps to 25/30Mbps ) - WDS seems to work better for now.

Try to use VPLS/MPLS

promind,
try to set MTU higher than 1500 (eg. 1530) on wlan interfaces,and then use EoIP.
You used dual antenna or two antennas per site?

I have two R2N mini pci wireless card, one is on the RB433,one is in my notebook,the wireless link is very bad.

sometimes the rate is 300M ,sometimes the rate is 5.5M, sometimes can not link.WHO can tell me way?

Try to use first only one chain and make the test and get that link stable working at max speed. then enable extended channel support to use 2 20mhz channels and try to get the max speed.
After that try the same with the other chain.
If everthing works, you can try to enable both chains at the same time. If that fails (unstable link) it means that the dual pol. antenna has some problems - interfernece between the both chains. If you have an option - try to use seperate antennas.

I try using only one chain, with channel 5370mhz because it was the lowest noise that I found (signal -58dBm, noise -96dbm), the bitrate goes to 65mbit/s, and I get 50mbit/s half direction throughput test. When I start bi-direction test, the bitrate varying from 6 to 36mbit/s randomly, and the speed is very bad (less than 3/3mbit/s)

I algo tried with a SR71A, and the problem its same, but I noticed a slight improvement, bitrate in full-duplex test varying from 18 to 65mbit/s, and the throughput in full-duplex test is less than 6mbit/s.

I think it can not be an antenna problem, because I'm using only 1 chain. Any sugestion?

Hello Tikpeople!

Any know what is AMPDU Priorities? AMPDU is agreggation of mac protocol data units. What is priorities in AMPDU? What configure?
Thanks all

http://forum.mikrotik.com/viewtopic.php ... 64#p163264 UPDATE
I did some tweaking meanwhile but i didn't get any visible improvements...
Disabled Nstreme, removed WDS, and enabled all the HT rates..

Then i bought 2 Jirous Dual Pol Disc 24db Looks good isn't it?
200mbit UDP (120+80)
70mbit TCP FD (i made the test between the 2 links, i didn't have a x86 on both ends to make a better test)

Then i bought 2 Jirous Dual Pol Disc 24db

What antennas where you using before these?

From my previous post http://forum.mikrotik.com/viewtopic.php ... 64#p163264

Encouraged by this thread, i purchased 2 R52N and 2 RB411AH to make a 802.11n link and see his throughput.
The antennas are 2 flat panel 10° 23dbi with different polarization (H and V).
I established a working and 100% stable link with those parameters..

From my previous post http://forum.mikrotik.com/viewtopic.php ... 64#p163264

Encouraged by this thread, i purchased 2 R52N and 2 RB411AH to make a 802.11n link and see his throughput.
The antennas are 2 flat panel 10° 23dbi with different polarization (H and V).
I established a working and 100% stable link with those parameters..

Do you know how many antennas out there match that description Not all antennas are created equal so it would be nice to know what manufacturer/model are not so good.

2x http://www.interline.pl/htdocs/modules/ ... N-23/5X-HV on each end
Oh and i'm plenty of those for point to point purpose or AP purpose... and they work very good. But looks like 802.11n doesn't like them

What exactly does the HT AMPDU settings do on the bottom with all the check boxes. I have been leaving mine default as I do not see any difference selecting them or not. Thanks

What exactly does the HT AMPDU settings do on the bottom with all the check boxes. I have been leaving mine default as I do not see any difference selecting them or not. Thanks

from the wiki:

ht-ampdu-priorities - frame priorities for which AMPDU sending (aggregating frames and sending using block acknowledgement) should get negotiated and used. Using AMPDUs will increase throughput, but may increase latency therefore may not be desirable for real-time traffic (voice, video). Due to this, by default AMPDUs are enabled only for best-effort traffic.

from the wiki:

ht-ampdu-priorities - frame priorities for which AMPDU sending (aggregating frames and sending using block acknowledgement) should get negotiated and used. Using AMPDUs will increase throughput, but may increase latency therefore may not be desirable for real-time traffic (voice, video). Due to this, by default AMPDUs are enabled only for best-effort traffic.

[/quote]

Well Uldis,
This is not giving much explanation. First of all the statement is full with uncertainties "should get negotiated and used", ..... " but may increase latency" .... "may not be desirable ...."
A lot of uncertainty in this wordings......

And then the last line containing "best-effort traffic." What is that? "Best-effort" What does it mean? In which case? Actually my conclusion would be indeed to leave it at default because anything else is worse?

And indeed, I tried several settings but hardly see or notice any differences. The only difference I see is that default setting give low throughput which is according this explanation preferred in case the network has to carry ´real time´ traffic due the shortest latency. But the throughput is now hardly any better then a normal configured (no ´n´) link. What is now then the gain in using ´n´?

It would be nice to explain a bit more simple to us not so technically achieved brains what AMPDU's are actually doing. Maybe we get some better understanding that way?

Mikrotik 802.11n + Bullet2M - is it work?

I have TP-Link TL-WN861N minipci card. It is 2.4Ghz only card, but in latest Router OS 4.0beta4 I can't get work 40MHz N rates (HT-40). HT20 work fine.

Here is /interface wireless info print :

interface-type=Atheros AR5416 chip-info="mac:0xd/0x2, phy:0x81, a5:0xf0, a2:0x0, eeprom:0x0" pci-info="00:13.0"
capabilities=tx-power-control,ack-timeout-control,virtual-ap,alignment-mode,scanning,nstreme,sniffing,ht40-g,wmm
default-periodic-calibration=enabled supported-bands=2ghz-b,2ghz-g,2ghz-11n
2ghz-b-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,2462:0,2467:0,2472:0,2484:0
2ghz-g-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,2462:0,2467:0,2472:0,2484:0
2ghz-11n-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,2462:0,2467:0,2472:0,2484:0
ht-chains=0:chain0,2:chain2

is "ht40-g" means support for HT-40 rates ? Or this card does not support it ?

hey boys... anyone make a real long long outdoor link using MIMO? Ie: 45km , 50km 60km???

regards

I have only 2 question ...

Does 802.11n work with hwmp+ mesh ( i know about the wds issue)

i wanna know if 802.11n in wds mode are more fast then a standard 802.11a wds despite de wds problem

I am not sure if this is the best place for this but i have a 1 mile link setup i get 85 mbps tcp on this link. One issue i am running into is if i hide ssid on the ap and the client reboots or loses power it wont connect untill i unhide the ssid and after it associates i can rehide the ssid and it works fine untill the client loses power or i reboot it?

I am running the SR71-15 cards and am at RouterOS 4.0Bata4
I have a signal strength of -60 and CCQ is 99%-100%

Noise Floor -121 dbm

Sorry if this isnt the correct place to post this!
Thanks

Harder Link! Anyone can help me figure out how HT MCS works? I'm playing with them until the link goes a little more stable, but cannot understand it properly... Is there any reference where i can get some further info about it?
This is Nstreme disabled and hw-retries=15
I'm wondering how can i fix those pings.. they are way too high imho... But if i lower hw-retries, the rate drops too much often and the bandwidth drops aswell..
I know that is not the best link ever (Fresnel fucked up), but if anyone has some nice hint i would try it (Software hints that is)
BTW the other link of 500 is rock stable at 270Mbs-HT

Update on that link... tweaking on MCS and on extension channel i fixed the link at 260mbit-HT/260mbit-HT . (only HT-MCS 5 and 13 enabled)
Enabling Nstreme the ping has been fixed too!
I'm impressed. I didn't expect this performance with that poor link enviorment.

can you post your end configeration for use please

Here you go To ensure a transparent bridging i'm using VPLS

what was your end throughput on tcp and udp?

70Mbit FD

Are there any bugfixes on 802.11n in 4.0rc1?

so this is in the feald

1 more thing can you give me information on the antennas that you are useing

as i have only managed to get 35mb FD

Hello,

I test bonding with two R52N each side but bonding not work.. Bonding of wireless N do not work yet?

We tested 802.11n using SparkLAN cards. Here is the results.
All test are on 5km distance using dish dual polarization antena.

Test 1. 179.2Mbit/s We used RB600a and SparkLAN Wmia-198N, Bandwidth UDP Test: Test 2. 107/103.1M We used RB600a and Wmia-198N, Bandwidth UDP Test BOTH: Test 3. 40.5/76.3M We used rb433ah and Wmia-198N, Real Traffic Torrents via PPPoE + Bandwidth Test TCP Continued in next post as 3 attachments is the maximum in one post ...

Test 4. 114M We used RB433AH and Wmia-198N. Real Traffic Only via 2 Ether and 2 PPPoE tunnels downloading linux distributions via torrents Test 5. 96.4/80.7M We used RB433AH and Wmia-198N. UDP Both Bandwidth test Test 6. 105.2/81.2 We used X86 machine and WPEA-110N mini-pci-e on TCP Bandwidth Test And last test continued on next post ...

Test 7. 131M We used x86 machine and WPEA-110N for real trafic downloading linux distributions using torrents + TCP Bandwidth Test from other location to this one:

Hiding the SSID 802.1N is not working.

The client is not able to connect anymore.

tested with 4.0rc1

regards
Ros

The majority of the tests & info supplied here so far is on backhaul PTP links...
What I'm interested in, is one of the supposed real benefits of n, which is multipath correction. (Correct term?)
Also, as my 5GHz backhauls is more than the maximum Internet speeds I can supply (All Links>=16Mbps half-duplex; Internet 10Mps) I see no real benefit in upgrading backhaul to n at this stage(apart from the minority of clients that copy files between each other). Also as congestion is bad, using broader frequency range (40Mhz), is not a good idea here.

However, if and n AP would help my b/g clients get better throughputs due to multipath correction, that would now really interest me and I'll immediately change all my b/g & a APs to R2n/R52n cards with dual antennas. Also, due to interferrence/congestion in my area, I'll switch over to HP, but as it is a very significant cost/downtime outlay(to change all clients), I would appreciate everyones thought/experience in this regard.

In short: Would an n AP be much better that an 'b/g' or 'a' AP if the clients stay as they are(b/g or a, not n)?
I suppose, that can start a new thread as issues like the control channel would probably be useless and so on, but my question is if the dual-antenna n radio will better handle range/sensitivity/multipath that current APs.

Thanks for a great thread so far...
Ekkas

hello
at this moment we have configured n with two 5 ghz antennas, but bandwidth test shows no more than 50 mbps, in registration first rate`s signal strength is -54, also rate stops increase at HT20-8. as i guess that`s cos of bad signal strength.


now we are going to test with Dual polarization antennas and which antennas do you advise?

another thing is that when we test bandwidth, after about 10 sec both sides reboots, we changed os to latest version 4.0rc1 but same. routerboard is RB600

Thanks

Hello,

Here the same results that user samcarney with WLAN-0043 Poynting antennas + R52N + 411AH. I just have dismounted a 3km link because I couldn't go up that 20Mbps TCP spite that I had 177Mbps UDP in just one direction. I have got the same results in the office.

I see success links with R52N so the guilty are the Poynting antennas? Anyone has a good N link with WLAN-0043?

In the other hand, I would open discussion about interference in N. What are our weapons against interferences? In old-fashioned links We could work with autonoise immunity, CSMA, reduce channel bandwith, reduce data rates to improve stability (I havent appreciate this on N),...

Now with N are We naked in front of interferences?

Hello,

I have RB600A + R52N as home AP. If I switch the radio to 2.4 B/G mode, I can achieve actual cca. 18-20 Mbps down from speedtest.net. That is something typical with plain G.
Even then, uplink is nearly just 3 Mbps on one of the laptops, while on another one it is 5. Strange. Is it a problem on the laptop side?

Now, if I switch the radio to 2 GHz B/G/N mode, download will decrease to cca 5 Mbps on both laptops, no matter if i set laptops to work N or not...

Does anyone have any proven wireless settings for a SOHO AP using these R52N cards?

Will be 802.11n stable as Turbo mode with one antenna on each side?

Try to use first only one chain and make the test and get that link stable working at max speed. then enable extended channel support to use 2 20mhz channels and try to get the max speed.
After that try the same with the other chain.
If everthing works, you can try to enable both chains at the same time. If that fails (unstable link) it means that the dual pol. antenna has some problems - interfernece between the both chains. If you have an option - try to use seperate antennas.

Hi there!

I got this message right after I have the same situation. BUT we use separate antennas.

Distance: 22km.
AP site: 2 X 1.2m antennas with different polarization.
station site: 2 X 1.4m antennas with different polarization.

With xr5 cards (a couple both sides, bonded) we have bandwidth test such as follows (all tests made on station side):
[*] direction=transmit: 115Mbps;
[*] direction=receive: 102Mbps;
[1] direction=both: 65Mbps/50Mbps.
With this configuration link works already more than an year.

Replacing existing cards with SR71A (one each side) N-draft cards we have following tests:
[*] direction=transmit: 175Mbps;
[*] direction=receive: 143Mbps;
[2] direction=both: 2.5Mbps/2.0Mbps (terrible ah.. ).

Note that station side antennas are bigger (1.4m diameter vs. 1.2m @AP side). Therefore, there is a normal difference of 175 vs. 143Mbps of bandwidth test. BUT what's going on when testing with direction=both?

Okay, let us suppose that there is a worst link 'cause some interference or smt... Then where is that interference when we get ref. [1] (shown above).

Is it possible the only reason of that is the distance of 22km? By the way, when we test configurations at the office, we have tests listed bellow:
[*] transmit: 127Mbps;
[*] receive: 130Mbps;
[*] both: 65/65 Mbps.

I hope somebody have any idea about that.

Screenshots attached.

Hello @ all.

We are a small wisp in Germany. Im reading for a long time here in the forum. We have problems with N, too. The same Problem as chvdr.

Our Equipment at both Sites:

RB433AH + R52N + 2*30dBi Mars Antennas Flat Pannel (No DUAL!!) but in Dual-Polarisation (1 * hor + 1 * ver).

The 2 Antennas (H + V on both Sites) are mounted in a distance of 1 meter. The Distance of the 2 Points (AP and Client) are 11 Km.

The Line is TOP.

But the Results are the same as chvdr. Receive or Send allone are no Problems and the CCQ is at 95% - 100% TX and RX. Only when Traffic is set to both, the Link is breaking down. The Results are the same as chvdr. The CCQ is then at 3% - 4% TX and RX. We have all the settings tested but there is no better. I don't understand what the problem is becaus another user here in the forum have stable links with same hardware! We have the same Line with dual-Antennas tested but the same results with the others.

Are there any Mounting-defaults on the sites between the antennas?

Thanks for help.....

joban

Hello @ all.

We are a small wisp in Germany. Im reading for a long time here in the forum. We have problems with N, too. The same Problem as chvdr.

Our Equipment at both Sites:

RB433AH + R52N + 2*30dBi Mars Antennas Flat Pannel (No DUAL!!) but in Dual-Polarisation (1 * hor + 1 * ver).

The 2 Antennas (H + V on both Sites) are mounted in a distance of 1 meter. The Distance of the 2 Points (AP and Client) are 11 Km.

The Line is TOP.

But the Results are the same as chvdr. Receive or Send allone are no Problems and the CCQ is at 95% - 100% TX and RX. Only when Traffic is set to both, the Link is breaking down. The Results are the same as chvdr. The CCQ is then at 3% - 4% TX and RX. We have all the settings tested but there is no better. I don't understand what the problem is becaus another user here in the forum have stable links with same hardware! We have the same Line with dual-Antennas tested but the same results with the others.

Are there any Mounting-defaults on the sites between the antennas?

Thanks for help.....

joban

Have you tried use fixed data-rates? Some other posts say that the automatic datarate-selection does
not work well.

Stefan

Your problem is most likely a problem of separation between the antennas. Try dual pol antennas with the same setup..

I have write in the previous post that we have tested the same with mars dual pol antennas, theresult was the same. What do you mean with "seperation between the antennas"?. Yes, we has also testet with fixed rates. Thanks for help.

AFAIK there are 2 versions of mars antennas dual pol.. one of them isn't working good because the separation between the two connectors wasn't enough and they were causing interferences...
I tested a N link with 2 separated antennas and didn't have enough isolation. Same link with Jirous Antennas works flawlessly.

What isolation in db is the minimum by dual pol antennas that the link is working?

In tiktube has anyone a video recordet that was presentet by the mum this year. In this video they hav 4 antennas, and no dual pol and the link works fine.

Sorry for my question but 2 seperate antennas with different polarization has more isolation between the polarisations as a dual pol antennas, isn't it?

Your problem is most likely a problem of separation between the antennas. Try dual pol antennas with the same setup..

tell us one reason to do that. As I told you before, we have actual link with the same antennas on 5GHz. Bonded cards xr5. Also, we use antennas with different polarization, i.e. one is vertical, another - horizontal.

Hello @ all.

We are a small wisp in Germany. Im reading for a long time here in the forum. We have problems with N, too. The same Problem as chvdr.

Our Equipment at both Sites:

RB433AH + R52N + 2*30dBi Mars Antennas Flat Pannel (No DUAL!!) but in Dual-Polarisation (1 * hor + 1 * ver).

The 2 Antennas (H + V on both Sites) are mounted in a distance of 1 meter. The Distance of the 2 Points (AP and Client) are 11 Km.

The Line is TOP.

But the Results are the same as chvdr. Receive or Send allone are no Problems and the CCQ is at 95% - 100% TX and RX. Only when Traffic is set to both, the Link is breaking down. The Results are the same as chvdr. The CCQ is then at 3% - 4% TX and RX. We have all the settings tested but there is no better. I don't understand what the problem is becaus another user here in the forum have stable links with same hardware! We have the same Line with dual-Antennas tested but the same results with the others.

Are there any Mounting-defaults on the sites between the antennas?

Thanks for help.....

joban

Have you tried use fixed data-rates? Some other posts say that the automatic datarate-selection does
not work well.

Stefan

Yes, we does.

But I think that we can work with data-rates=default, because our signal strength is -52 - -55dBm. Anyway, we fix it. As best result given in one direction or another.

At least, same result, poor both-sides-bandwidth-test, 2-3Mbps each site.

AFAIK there are 2 versions of mars antennas dual pol.. one of them isn't working good because the separation between the two connectors wasn't enough and they were causing interferences...
I tested a N link with 2 separated antennas and didn't have enough isolation. Same link with Jirous Antennas works flawlessly.

what isolation could it be in two separate 140cm diameter dishes?

You know, i'm not an expert technician, i'm just explaining my own experience that might be misunderstood itself...
I think if you manage to have 2 separated antennas with the same and perfect direction (same degrees of H and V) on both side, you should have a good result..
This is almost impossible to do on long links and even the two local antennas might have a different degree of direction.
This might end on overlapping links. Two separated links don't suffer it too much (see your bonded links) but it has some problems on 802.11n.
Once again i repeat this isn't the TRUTH, but only my thoughts based on my own experience.

Hi

We are trying a 16km with two R52N cards and Dual Pol Italian EMCTest (29dBi), signal is -65
and we have the same problems that chvdr is having.

CCQ is okay (80-100%) but when running a bw test, all rates goes to 6mbps/6mbps and the link goes down due to excessive retries.

We tried 2 R52N each side to simulate a full duplex like showed in the MUM to use 2 channels that does not interfere between them, but the result was the same.

I think i'll try one single chain with a single antenna at each side to see if i get any better result.

Does anyone have any clue about this problem?

Sorry for my bad english

Thanks

Sorry for my question but 2 seperate antennas with different polarization has more isolation between the polarisations as a dual pol antennas, isn't it?

I don't understand this..... has anyqone a answer to this question?

yep

802.11n ? funny...

Hello,
i got problem with TCP performance on 802.11n.
My configuration is: 2xRB411H + R52n. I tried all possible connections, WDS was not working good.
Now i got configuration station-bridge. Config:
0 R name="wlan1" mtu=1500 mac-address=00:0C:42:61:04:9A arp=enabled disable-running-check=no interface-type=Atheros 11N
radio-name="000C4261049A" mode=ap-bridge ssid="sgc" area="" frequency-mode=manual-txpower country=no_country_set
antenna-gain=0 frequency=5180 band=5ghz-onlyn scan-list=default rate-set=configured supported-rates-b=""
supported-rates-a/g="" basic-rates-b="" basic-rates-a/g="" max-station-count=2007 ack-timeout=dynamic tx-power-mode=default
periodic-calibration=default periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a wds-mode=disabled
wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
proprietary-extensions=post-2.9.25 wmm-support=enabled hide-ssid=no security-profile=default disconnect-timeout=3s
on-fail-retry-time=100ms preamble-mode=short compression=no allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00
ht-ampdu-priorities=0,1,2,3,4,5,6,7 ht-guard-interval=any ht-extension-channel=above-control
ht-supported-mcs=mcs-0,mcs-7,mcs-8,mcs-14,mcs-15 ht-basic-mcs=mcs-0 ht-txchains=0,1 ht-rxchains=0,1 ht-amsdu-limit=8192
ht-amsdu-threshold=8192 hw-retries=15 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0

0 R name="wlan1" mtu=1500 mac-address=00:0C:42:61:04:DD arp=enabled disable-running-check=no interface-type=Atheros 11N
radio-name="000C426104DD" mode=station ssid="sgc" area="" frequency-mode=manual-txpower country=no_country_set
antenna-gain=0 frequency=5180 band=5ghz-onlyn scan-list=default rate-set=configured supported-rates-b=""
supported-rates-a/g="" basic-rates-b="" basic-rates-a/g="" max-station-count=2007 ack-timeout=dynamic tx-power-mode=default
periodic-calibration=default periodic-calibration-interval=60 dfs-mode=none antenna-mode=ant-a wds-mode=disabled
wds-default-bridge=none wds-default-cost=100 wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled
default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
proprietary-extensions=post-2.9.25 wmm-support=enabled hide-ssid=no security-profile=default disconnect-timeout=3s
on-fail-retry-time=100ms preamble-mode=short compression=no allow-sharedkey=no station-bridge-clone-mac=00:00:00:00:00:00
ht-ampdu-priorities=0,1,2,3,4,5,6,7 ht-guard-interval=any ht-extension-channel=above-control
ht-supported-mcs=mcs-0,mcs-7,mcs-8,mcs-14,mcs-15 ht-basic-mcs=mcs-0 ht-txchains=0,1 ht-rxchains=0,1 ht-amsdu-limit=8192
ht-amsdu-threshold=8192 hw-retries=15 frame-lifetime=0 adaptive-noise-immunity=none hw-fragmentation-threshold=disabled
hw-protection-mode=none hw-protection-threshold=0

With EoIP UDP result was around 90Mbps each direction. With MPLS/VPLS its about 190Mbps in each direction. Interfaces are connected
at 270.0Mbps-HT/270.0Mbps-HT. But when i try TCP bandwidth test, result is only 27-30Mbps in both direction. I tried with nstream/ without,
also i tried real connection between 2 laptops and with same result. OS version is 4.0rc1. Have any help or advice what to do, why TCP
connection is so slow? Thanks

airborne

Let's just admit: N is good on a test bench but when we take it outside we all have problems.
I switched from MKTK to UBNT and back playing with all kind of N h-ware and antennas; doesn't work as reliable as advertised... not just yet in outdoor. Manny days spent to run tests, climbing towers and replacing h-ware.
Indoor - works just peachy.

Shame... 7 years of struggling for the standard to be ratified by the Wireless Alliance from which 2 years of N draft 2.0.
Transmission on up to 3 streams supporting up to 450mbps, packet aggregation (the famous A-MPDU), block coding (STBC) - they all look good on paper but not on real life.

I am frustrated. I think N sucks, in the end; I'll probably change my opinion in a month or probably 12, never know

Regards,
Steven

Let's just admit: N is good on a test bench but when we take it outside we all have problems.
I switched from MKTK to UBNT and back playing with all kind of N h-ware and antennas; doesn't work as reliable as advertised... not just yet in outdoor. Manny days spent to run tests, climbing towers and replacing h-ware.
Indoor - works just peachy.

Shame... 7 years of struggling for the standard to be ratified by the Wireless Alliance from which 2 years of N draft 2.0.
Transmission on up to 3 streams supporting up to 450mbps, packet aggregation (the famous A-MPDU), block coding (STBC) - they all look good on paper but not on real life.

I am frustrated. I think N sucks, in the end; I'll probably change my opinion in a month or probably 12, never know

Regards,
Steven

It can be done. Look at expensive equipment like Orthogon (now Moto). They can
do MIMO for a long time now. I think it's a matter of quality of all components
(card, pigtail, antenna, isolation, software) and to find the best combination of them.
As this is not our job, we're spending our money for licensed backhaul equipment for
the moment until MT presents a working solution.

Stefan

... make you wonder - what kind of reference OS/system Atheros uses?
AtherOS + Atherboard

... make you wonder - what kind of reference OS/system Atheros uses?
AtherOS + Atherboard

check this out:
http://www.wi-fi.org/search_products.ph ... s%5B%5D=41

Regards,

Let's just admit: N is good on a test bench but when we take it outside we all have problems.
I switched from MKTK to UBNT and back playing with all kind of N h-ware and antennas; doesn't work as reliable as advertised... not just yet in outdoor. Manny days spent to run tests, climbing towers and replacing h-ware.
Indoor - works just peachy.

Shame... 7 years of struggling for the standard to be ratified by the Wireless Alliance from which 2 years of N draft 2.0.
Transmission on up to 3 streams supporting up to 450mbps, packet aggregation (the famous A-MPDU), block coding (STBC) - they all look good on paper but not on real life.

I am frustrated. I think N sucks, in the end; I'll probably change my opinion in a month or probably 12, never know

Regards,
Steven

iam testing whole solution indoor. i saw here in forum that other people have better results with TCP connection,
so i guess that it must be something bad configured or wrong OS version. but iam out of ideas

airborne

I've just setup an N link, 11.5km

Site A: 411AH + R52N + http://www.mars-antennas.com/item/g_ant ... _1-44.html (MA-WA56-DP25N)

Site B: 411AH + R52N + http://www.l-com.com/item.aspx?id=22099

both sites are pretty busy with RF, and I don't know all frequencies (ie other operators!) so it's a guessing game to find a channel. Clear LOS.

As for the settings, I've pretty much winged it .. click a few buttons, not really knowing why, and now it's running and I hope it doesn't fall over ...

nstream, WDS, callibration off, HT extension below channel

Everything is pretty much default, the most confusing thing for me is which HT supported and HT basic settings to set!! If someone could explain this a little more to me?

Also, I do suffer from not R'ing TFM, so if there's a good "if you want to setup an 802.11n link, read this first" document/site anywhere, let me know also.

Performance:-

thruput (I've an RB1000 connected to site A, and a RB493 at site B)

I get 25 Mbps FD tcp, and 30Mbps FD udp ... which I'm happy enough with for now.

settings:-

/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=26 antenna-mode=ant-a area="" arp=enabled band=5ghz-onlyn basic-rates-a/g="" \
basic-rates-b=1Mbps comment="" compression=no country=ireland 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=5320 frequency-mode=manual-txpower hide-ssid=no \
ht-ampdu-priorities=0,1,2,3,4,5,6,7 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-12,mcs-13,mcs-14 \
ht-extension-channel=below-control ht-guard-interval=any ht-rxchains=0,1 ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-12,mcs-13,mcs-14 ht-txchains=\
0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:CD:B9 max-station-count=\
2007 mode=ap-bridge mtu=1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=both \
proprietary-extensions=post-2.9.25 radio-name=000C423ACDB9 rate-set=configured scan-list=default security-profile=default ssid=mik-new-n station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g="" supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 \
wds-default-bridge=bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic wmm-support=disabled
/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,HT20-0:0,HT20-\
1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40-7:0"
/interface wireless nstreme
set wlan1 comment="" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=none



/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=23 antenna-mode=ant-a area="" arp=enabled band=5ghz-onlyn basic-rates-a/g="" \
basic-rates-b=1Mbps comment="" compression=no country=ireland 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=5320 frequency-mode=manual-txpower hide-ssid=no \
ht-ampdu-priorities=0,1,2,3,4,5,6,7 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-12,mcs-13,mcs-14 \
ht-extension-channel=below-control ht-guard-interval=any ht-rxchains=0,1 ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-12,mcs-13,mcs-14 ht-txchains=\
0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:CD:06 max-station-count=\
2007 mode=station-wds mtu=1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=both \
proprietary-extensions=post-2.9.25 radio-name=000C423ACD06 rate-set=configured scan-list=default security-profile=default ssid=mik-new-n station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g="" supported-rates-b=1Mbps tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=\
bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic wmm-support=disabled
/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,HT20-0:0,HT20-\
1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40-7:0"
/interface wireless nstreme
set wlan1 comment="" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=none

Hello Normis .
I test 4 link with 802.11n , with RB/600A ,R52N , 30dBi parabolic .
On all of them when run BTest , the bandwidth are 115~149 Mbps depend on distance , but this is not my problem .
when I send file from windows computer to another windows computer the traffic rate in WLAN interface show me MAX 57 Mbps and cpu usage is 60%~70% .
I set these four link (Bridge-Station) and set route , (Bridge-Station) and set Eoip-T and Bridge with Ether1 , (Bridge-Station-wds) and Bridge Ether1 with Wlan1 and Nstreme is enable .
When I set Bridge-Station-wds and bridge Ether1 with Wlan1 I get the best result on my link but this best result only allow me to send data on tow computer only 57 Mbps .
I can get picture and send it for you .

I've just setup an N link, 11.5km

Site A: 411AH + R52N + http://www.mars-antennas.com/item/g_ant ... _1-44.html (MA-WA56-DP25N)

Site B: 411AH + R52N + http://www.l-com.com/item.aspx?id=22099

both sites are pretty busy with RF, and I don't know all frequencies (ie other operators!) so it's a guessing game to find a channel. Clear LOS.

As for the settings, I've pretty much winged it .. click a few buttons, not really knowing why, and now it's running and I hope it doesn't fall over ...

nstream, WDS, callibration off, HT extension below channel

Everything is pretty much default, the most confusing thing for me is which HT supported and HT basic settings to set!! If someone could explain this a little more to me?

Also, I do suffer from not R'ing TFM, so if there's a good "if you want to setup an 802.11n link, read this first" document/site anywhere, let me know also.

Performance:-

thruput (I've an RB1000 connected to site A, and a RB493 at site B)

I get 25 Mbps FD tcp, and 30Mbps FD udp ... which I'm happy enough with for now.

settings:-

/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=26 antenna-mode=ant-a area="" arp=enabled band=5ghz-onlyn basic-rates-a/g="" \
basic-rates-b=1Mbps comment="" compression=no country=ireland 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=5320 frequency-mode=manual-txpower hide-ssid=no \
ht-ampdu-priorities=0,1,2,3,4,5,6,7 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-12,mcs-13,mcs-14 \
ht-extension-channel=below-control ht-guard-interval=any ht-rxchains=0,1 ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-12,mcs-13,mcs-14 ht-txchains=\
0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:CD:B9 max-station-count=\
2007 mode=ap-bridge mtu=1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=both \
proprietary-extensions=post-2.9.25 radio-name=000C423ACDB9 rate-set=configured scan-list=default security-profile=default ssid=mik-new-n station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g="" supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 \
wds-default-bridge=bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic wmm-support=disabled
/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,HT20-0:0,HT20-\
1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40-7:0"
/interface wireless nstreme
set wlan1 comment="" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=none



/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no antenna-gain=23 antenna-mode=ant-a area="" arp=enabled band=5ghz-onlyn basic-rates-a/g="" \
basic-rates-b=1Mbps comment="" compression=no country=ireland 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=5320 frequency-mode=manual-txpower hide-ssid=no \
ht-ampdu-priorities=0,1,2,3,4,5,6,7 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-12,mcs-13,mcs-14 \
ht-extension-channel=below-control ht-guard-interval=any ht-rxchains=0,1 ht-supported-mcs=mcs-0,mcs-1,mcs-2,mcs-3,mcs-4,mcs-5,mcs-6,mcs-12,mcs-13,mcs-14 ht-txchains=\
0,1 hw-fragmentation-threshold=disabled hw-protection-mode=none hw-protection-threshold=0 hw-retries=4 l2mtu=2290 mac-address=00:0C:42:3A:CD:06 max-station-count=\
2007 mode=station-wds mtu=1500 name=wlan1 on-fail-retry-time=100ms periodic-calibration=disabled periodic-calibration-interval=60 preamble-mode=both \
proprietary-extensions=post-2.9.25 radio-name=000C423ACD06 rate-set=configured scan-list=default security-profile=default ssid=mik-new-n station-bridge-clone-mac=\
00:00:00:00:00:00 supported-rates-a/g="" supported-rates-b=1Mbps tx-power-mode=default update-stats-interval=disabled wds-cost-range=50-150 wds-default-bridge=\
bridge1 wds-default-cost=100 wds-ignore-ssid=no wds-mode=dynamic wmm-support=disabled
/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,HT20-0:0,HT20-\
1:0,HT20-2:0,HT20-3:0,HT20-4:0,HT20-5:0,HT20-6:0,HT20-7:0,HT40-0:0,HT40-1:0,HT40-2:0,HT40-3:0,HT40-4:0,HT40-5:0,HT40-6:0,HT40-7:0"
/interface wireless nstreme
set wlan1 comment="" disable-csma=no enable-nstreme=yes enable-polling=yes framer-limit=3200 framer-policy=none

I have a Nstreme Dual Link on 5G with 28dBi panel antennas, XR5 and RB433AH at 27 Km doing the same as your N setup.
you can use bonding and achieve more.
So: what is the point of N? - all right you use a card instead of two so you save 50 bucks

N is advertised as we should be worry about ether ports of our boards not being able to sustain the wireless traffic...

Steven

Hello Normis .
I test 4 link with 802.11n , with RB/600A ,R52N , 30dBi parabolic .
On all of them when run BTest , the bandwidth are 115~149 Mbps depend on distance , but this is not my problem .
when I send file from windows computer to another windows computer the traffic rate in WLAN interface show me MAX 57 Mbps and cpu usage is 60%~70% .
I set these four link (Bridge-Station) and set route , (Bridge-Station) and set Eoip-T and Bridge with Ether1 , (Bridge-Station-wds) and Bridge Ether1 with Wlan1 and Nstreme is enable .
When I set Bridge-Station-wds and bridge Ether1 with Wlan1 I get the best result on my link but this best result only allow me to send data on tow computer only 57 Mbps .
I can get picture and send it for you .

your problem in windows mate
stop clickin'... start typing...
linuzzzz rocks

steven

Hello,

There is a config: pc--RB600A/R52N----RB600A/r52N--pc
ROS is 4.0rc1 on both boards.
The link is "perfect" stable (tx/rx rate 270/270Mbps, CCQ 95-100%).
BTest results: one direction 208Mbps UDP, both 153/148Mbps UDP, 144MBps TCP and both 87/72Mbps TCP. Its seems good but i tested iperf, result 30-37Mbps one direction and 24/28Mbps both direction. After that I tried copy a file between the pc-s but result was 22Mbps. What's wrong????

Gabor

gabris, look at the CPU load. It is near 100%?

I have a Nstreme Dual Link on 5G with 28dBi panel antennas, XR5 and RB433AH at 27 Km doing the same as your N setup.
you can use bonding and achieve more.
So: what is the point of N? - all right you use a card instead of two so you save 50 bucks

N is advertised as we should be worry about ether ports of our boards not being able to sustain the wireless traffic...

Steven

Steven,

I agree that an nstream2 link would be as good ... in fact it would be better, as I would know more about it and what to do if something goes wrong.

my problem is I don't know enough about 802.11n .. and what the options/settings mean. Are other people's optimum settings reached by trial and error? Is there a reason for choosing MCS-0, MCS-4 and MCS-15 (for example)? Does disabling periodic calibration always stop periodic disconnects? I understand that this is all test software .. I suppose I'm looking for more information ...

E

CPU load was 15-25% if i tested pc to pc.

4.0 is out!!
Did you fix nstreme on 802.11n?
Did you make any change on 802.11n at all?

4.0 is out!!
Did you fix nstreme on 802.11n?
Did you make any change on 802.11n at all?

You should run Nstreme with 802.11abg protocols, with 802.11n currently it's not recommended to use Nstreme. We are working on an entirely new Nstreme version, but it's not implemented in v4, because it's not made yet.

Good to know.. but you answered only at my first question..

Did you make any change on 802.11n at all?

... that is worth an upgrade for our links, that is

I have a Nstreme Dual Link on 5G with 28dBi panel antennas, XR5 and RB433AH at 27 Km doing the same as your N setup.
you can use bonding and achieve more.
So: what is the point of N? - all right you use a card instead of two so you save 50 bucks

N is advertised as we should be worry about ether ports of our boards not being able to sustain the wireless traffic...

Steven

Steven,

I agree that an nstream2 link would be as good ... in fact it would be better, as I would know more about it and what to do if something goes wrong.

my problem is I don't know enough about 802.11n .. and what the options/settings mean. Are other people's optimum settings reached by trial and error? Is there a reason for choosing MCS-0, MCS-4 and MCS-15 (for example)? Does disabling periodic calibration always stop periodic disconnects? I understand that this is all test software .. I suppose I'm looking for more information ...

E

I understand your problem mate but none of us knew it all from the beginning, we all learned as the technology evolved.
There are manuals and white pages out there I suggest you start reading them.
We all learned the hard way, no one will put their knowledge on a plate for you but people will answer your questions on forums.... depending how you ask them.
Remember, before asking a question... read the manual

good luck,

Steven

4.0 is out!!
Did you fix nstreme on 802.11n?
Did you make any change on 802.11n at all?

You should run Nstreme with 802.11abg protocols, with 802.11n currently it's not recommended to use Nstreme. We are working on an entirely new Nstreme version, but it's not implemented in v4, because it's not made yet.

I think this is laughable. N was the major feature for 4.0. Couldn't be in 3... Had to upgrade licenses to it. ( And thank you for making that no cost). But as we all are learning N interference has made it mostly unsuitable for populated areas without Nstream to combat it and Nstream for N is not being recommended. So 4.0 is a non-product in the wireless world. 4.0 should not have become a release candidate without a working Nstream and certainly not released as a "Product".... Have fun at all the user meetings, because they should have been delayed for your getting Nstream working...

Does seem very odd. I'm trying to understand why 4.0 would be released without the crown jewel (Nstream) working properly in N.

I can only guess there is addtional new hardware coming that needs 4.0 and MT didn't want to release on RC firmware...

George

Does seem very odd. I'm trying to understand why 4.0 would be released without the crown jewel (Nstream) working properly in N.

I can only guess there is addtional new hardware coming that needs 4.0 and MT didn't want to release on RC firmware...

George

I'll bet you are correct...

4.0 is out!!
Did you fix nstreme on 802.11n?
Did you make any change on 802.11n at all?

You should run Nstreme with 802.11abg protocols, with 802.11n currently it's not recommended to use Nstreme. We are working on an entirely new Nstreme version, but it's not implemented in v4, because it's not made yet.

I think this is laughable. N was the major feature for 4.0. Couldn't be in 3... Had to upgrade licenses to it. ( And thank you for making that no cost). But as we all are learning N interference has made it mostly unsuitable for populated areas without Nstream to combat it and Nstream for N is not being recommended. So 4.0 is a non-product in the wireless world. 4.0 should not have become a release candidate without a working Nstream and certainly not released as a "Product".... Have fun at all the user meetings, because they should have been delayed for your getting Nstream working...

Even at the thought of that delay (working N, nstreme whatever), many $ for companies that can sell high quality licensed equipment. E. g. NERA... Motorola...

IT IS A WAR, GUYS, IT IS A WAR... A war where nobody cares about us. Of course, I'm not sure, but this companies CAN PAY nstream to be delayed.

I hope so much all I told above is a "blether" (footle, bulshits...). Am I?

I don't see how anything has changed? In v3 you didn't have 802.11n, all you had is 802.11abg with Nstreme. You still have the same in v4, only you have turbo-less 802.11n in addition to that.

I don't see how anything has changed? In v3 you didn't have 802.11n, all you had is 802.11abg with Nstreme. You still have the same in v4, only you have turbo-less 802.11n in addition to that.

N without Nstream to defeat interference is slower that a/g.... Not much of a product...

I don't see how anything has changed? In v3 you didn't have 802.11n, all you had is 802.11abg with Nstreme. You still have the same in v4, only you have turbo-less 802.11n in addition to that.

N without Nstream to defeat interference is slower that a/g.... Not much of a product...

haha well maybe not in your case, but not everyone has this problem.

we are testing N in a 15.6km link with Dual Pol Jirous 24Db dishes,
signal is at -68/-70 noise is at -115

We are unable to run the link stable and to pass a decent traffic.

The better modulation it can get is 58-HT, but not able to pass more then 25mbps full duplex. And Also at zero traffic the ping is very erratic.
With just 5mbps of real traffic we have 20-50ms jitter.

very sad to not use turbo on r52n, so we cant be back to the old config..............

regards
Ros

Does WDS work on ROS4.0 and 802.11n? If not, it will in a future release?

Hi!

We are a WLAN-Provider and testing 802.11n in realtime production. We are use dual-polarization Antennas and 433AH and R52n ...

We have now 3 Point-To-Point Connections in work. The tested throughput is about 115 MBps on a distance of 7 km. The realtime throughput on production is now about 50 Mbit without problems and latency is peaked to 50 ms....

The only Problem was: 2 R52n cards in one 433Ah didn't work (too much interference, no throughput ...), so put the cards in 2 433 AH's and it works fine.

Now we tested on Outdoor AP's on a mixed environment a/n for higher througput to the customers ....

The rate is much higher about 3 times with just 802.11n AP and client with one omni-Antenna... So it sounds good and cheap to change it for out customers ...

But for high stability we limited the datarates to 6,9,12 MBps on the AP. If we use a/n - Mode and Limit the DataRates no 802.11a Client will connect and 2nd problem is: With only a the CCQ is Tx 90%/Rx 80%. On mixed mode after a few minutes the CCQ is to same Client 75%/30% and no throughput. The signal is with -65 dbm very fine. Some Clients works fine. I tested several frequenzy etc. For The AP we are using RB600A with two R52n und 2 R52 a and b mode.

It seems that the R52n has an interference on other R52n on the same board .....

Has anybody tested this sitoution ....

Greetings from Austria
Dietmar

Hi all,

this is only for your information
after running a 6 km link in a country side with acceptable bandwidth we tried to establish an 802.11n 2 km-link at the city location as high speed last mile solution.

The result is: Unusable. We are not able to get a stable result. The RX levels and the signal quality was very good. I think there is to much interference ...

Hi there,
I have one suggestion to MT: add the option "short" to ht-guard-interval (currently only "any" and "long" can be set), as "any" switches between 400ns and 800ns, "long"=800ns, and I want to set 400ns i.e. "short"

RouterOS 4.1 !!

RouterOS 4.1 !!

Changelog mentions nothing about N

Hi all,

this is only for your information
after running a 6 km link in a country side with acceptable bandwidth we tried to establish an 802.11n 2 km-link at the city location as high speed last mile solution.

The result is: Unusable. We are not able to get a stable result. The RX levels and the signal quality was very good. I think there is to much interference ...

Hi Complete,

Probably You not made proper settings. N works fine at distances lower than 10km. Believe me. When distance up to 20-25km there is a interference result because nstreme works unstable. Or not works at all. I don't know.

If not, contact support. Better share your wireless conf with us first. But after read forum about n-draft configs.

Oh, I forgot. With dist. of several kilometers I usually do configs on a table in our office taking two routers here. And when they migrate in a real nature - they works fine. Attn.: in short distances only.

RouterOS 4.1 !!

Changelog mentions nothing about N

Completing n-draft by MikroTik SIA will be a break news in latest news on any tv... So waiting for that you should not reading this forum, just watching tv. Time by time...


Peace all,
C.G.

Hi Guys!

I am in need of some help.

I have previously setup a test link with a 2 x R52 Wireless cards and 2 x 433AH Routerboards with a TCP throughput of 70mb/s TCP with FTP file transfer between 2 laptops. I recently received 2 x R52N card and was very exited about the the possible thoughput.

I have setup a link using 2 x dipoles, 2 x R52N Wireless cards and 2 x 433AH Routerboards. After some testing i got the link throughput upto 63mb/s TCP using the onboard bandwith test. The CPU was running at 100% so i then moved to a FTP file transfer between 2 Laptops.

The results fluctuated between 20mb/s and 33mb/s. Could anyone shed some light on possible problem?

I have checked that antivirus and firewall are turned off.

Cheers

With reference to my last post i have tried this through PC-PC and still only 35mb/s. I have tried using only one chain and still the throughput is only 35mb/s. It appears that the second chain may not be being used.

Also can someone tell me for 300mb/s do you have to be using 2 x RB52N cards?

no, you can use 11b cards...

no, you can use 11b cards...

joke?

no, you can use 11b cards...

joke?

Also can someone tell me for 300mb/s do you have to be using 2 x RB52N cards?

Let me re-phrase that:

"for 300mb/s do you have to be using 2 x R52N cards each side of the wireless link? for example RB600 + 2 x R52N ---> RB600 + 2 x R52N"

Constructive comments ONLY please!

Hello. I'm new here, but I'd like to start with 802.11n test results that I've achieved.

These are kitchen tests only but for now I don't have time for real-life tests. Maybe next week.

Equipment:

Base:
2x 14dBi 5GHz panel antenna plus 3m CNT-240 cable (one for V and one for H pol.)
1x RB 411AR(!) + R52n

Client:

2x 14dBi 5GHz panel antenna plus 3m CNT-240 cable (one for V and one for H pol.)
1x RB 411AR(!) + R52n

I've been using ROS 4.0rc1 and 4.1 to test.

Results (PC-PC)


Half duplex TCP!




NStreme enabled. Without NStreme it's roughly 11mbps.
Plus with only one antenna (chain) on each side it's 80+mbps half duplex TCP.

Why isn't it working well with Nstreme disabled?
Greetings.
sq6

24km+rb600+r52n

But I can see big differences with and without.
More bandwidth, more stability... just like a 802.11a link.

RB411AH has 100mbit fdx ethernet..... how possible >180 mbit/s in UDP ????

Where do you see ethernet involved in this test???

On b-test everything is ok , but how about real customer traffic over 802.11n?
I have 4km link and RB600+r52n+two 23dBi flat panel on each side

aaa, this just means that users are not downloading anything.

Torch running on AP side. Monitor wlan interface running Station side.

Torch running on AP side. Monitor wlan interface running Station side.

so what? user not downloading anything. tell them all to run torrents at max speed then check

I mean user 192.168.1.182 download P2P traffic over 802.11n wireless at 47mbit speed.Total link consumption floating from 60-70mbit at max. load time.

This is one side installation photo

For point-to-point 802.11n, we'd like to start migrating some links over from 802.11a. I want to be sure I know what works now and what doesn't.

1. Nstreme - Does this work, or not at all? I'm seeing various responses here such as "not recommended," "works at short distances."

2. Link distance - Assuming we don't use Nstreme, is there a maximum link distance we are capped at? Again, if nstreme does work at short distances, what distance are we talking about?

3. WDS - Does it work, or not? Does it cause a performance hit? We need to be able to pass vlans over 433AH's, so we can't use the MPLS method (not enough MTU room).

4. Other recommended settings that are going to be different from the defaults or 802.11a settings?

5. Is 5 GHz 10 / 5 GHz 5mhz using 802.11a or n?

Thanks!

Randy

in my tests:
nstreme did work only on one chain (antenna) - on 2 chains it disconnected frequently

wds did work.

greetings

we are testing N in a 15.6km link with Dual Pol Jirous 24Db dishes,
signal is at -68/-70 noise is at -115

We are unable to run the link stable and to pass a decent traffic.

The better modulation it can get is 58-HT, but not able to pass more then 25mbps full duplex. And Also at zero traffic the ping is very erratic.
With just 5mbps of real traffic we have 20-50ms jitter.

very sad to not use turbo on r52n, so we cant be back to the old config..............

regards
Ros

We also have the same setup but only 10.5km link and have tried Dual Pol Jirous 24Db dishes and also Dual Pol Jirous 29Db dishes. I am using RB433AH and R52N Card.

I have managed to tweek it (with great difficulty) to a signal level of -69db and can get approx 101Mb TX and 80Mb RX UDP. The link is unstable though as both direction traffic will only peak at 5Mb or less. I have found that wireless encryption (TKIP) causes alot of speed decrease too. AES is working fine. I am not using WDS but am routing with OSPF.

I am using pretty much factory default settings (default power etc) in the wireless config.

3. WDS - Does it work, or not? Does it cause a performance hit? We need to be able to pass vlans over 433AH's, so we can't use the MPLS method (not enough MTU room).

The VPLS Method is establish between the two wlan of the 433AH's and doesn't passthrough the ethernets.. so i don't see your MTU problem..

Is anyone try to replace 5Ghz turbo link with 802.11n link using only one chain, antenna ?

Can I get more bandwidth simple replacing miniPCI card ?

Good 5Ghz turbo nstreme link in bandwidth test get 75Mbit in one way UDP test, can be faster only replacing miniPCI card ?

Thanks...

Is anyone try to replace 5Ghz turbo link with 802.11n link using only one chain, antenna ?

Can I get more bandwidth simple replacing miniPCI card ?

Good 5Ghz turbo nstreme link in bandwidth test get 75Mbit in one way UDP test, can be faster only replacing miniPCI card ?

Thanks...

We do that (replacing a with n-draft. one chain. ). Terrible results. Don't wasting your time.

Is anyone try to replace 5Ghz turbo link with 802.11n link using only one chain, antenna ?

Can I get more bandwidth simple replacing miniPCI card ?

Good 5Ghz turbo nstreme link in bandwidth test get 75Mbit in one way UDP test, can be faster only replacing miniPCI card ?

Thanks...

I agree too it would not be a good move..

IMHO, I would not replace the card to R52N if you can only use 1 chain. 802.11N or MIMO technology actually takes advantage of multipath to increase throughput as well as range. So one antenna will prohibit you from engaging the full potential. Your system will effectively behave like an 802.11a system and because Nstream and Turbo is not available you will not get better performance. Also don't forget that R52N cards are ufl and not mmcx so you may have to replace a pigtail too.

Thanks all for answer.

I think maybe using one chain can get little more bandwidth compare to 5Ghz turbo nstreme. Add one more antenna is little complicated need more space, stronger tower more cables is not option for now on that place. Also dual polarity antenna is usually solid parabolic antenna need stronger tower sometime time wind is very strong.
May be tested on some other place.

One more thanks to all.

What antennas have people had success with? I know there have been mention of Mars and a couple others who make dual pol. Any specs would be helpful.

-Z

802.11N or MIMO technology actually takes advantage of multipath to increase throughput as well as range. So one antenna will prohibit you from engaging the full potential. Your system will effectively behave like an 802.11a system...

This is not completely true - 11n has other advantages besides multipath - the most important being frame aggregation and block acknowledgement (used even if you have one chain), which ensures more efficent use of medium, therefore, provided that link quality allows the use of 11n rates, throughput will increase, even in 20MHz channel.