Throughput and CCQ decrease when traffic increase wireless N

mktwifi · August 28, 2009, 10:30am

Hi guys,
i have a ptp link with two RB600 with R52N card and two Pac Wireless dual polarized antenna: signal is good (about -65 dbm) and also CCQ and throughput (see wirelessn1.jpg) but when i execute a bandwidth test (not from routerboard but from two PC that are connected directly on routerboard), CCQ and also throughput go down (see wirelessn2.jpg): why?
May be an antenna problem? I try to change a lot of field (disable nstream, disable noise immunity, ecc.) in wireless configuration but problem persist. I also try to use only one chain but never.

Please help me!

Best regards

aaa · August 31, 2009, 6:55am

I have same problem , it seems TCP traffic kill CCQ. With UDP I have stable ~ 150mbit half duplex.

mktwifi · August 31, 2009, 10:20am

Also with UDP traffic there is ccq and througthput decrease problem.
Could be a routerOS problem? Or a dualpol antenna isolation problem?

I hope someone help us.

Regards

aaa · August 31, 2009, 11:50am

I use two 5G/522F flat panel on each side.I think it is not isolation problem.

mktwifi · August 31, 2009, 12:28pm

And so, what is the problem?
Is there anyone that has this problem?

Help please

Regards

mh1 · August 31, 2009, 12:39pm

And the same is here. Cannot get normal TCP throughput.
I’m afraid that this is a little bit unfinished yet.
Probably will try Ubiquiti new bullet5 M.

mktwifi · September 1, 2009, 3:13pm

Hi guys,
today I try, in an indoor test environment, with other two routerboard (RB411) with wireless N card and a 17 dbi flat panel antenna on each side (so with only one chain enable) but problem persist: when traffic increase ccq and througthput go down!

I think it is a RouterOS or a R52N problem: is it possible?

Help is appreciate

Thanks in advance

Regards

NetworkPro · September 2, 2009, 3:37am

Too bad the R52Ns don’t support turbo either so we cant properly use them in 11a turbo + nstreme mode either. Too bad.

mktwifi · September 2, 2009, 4:06pm

Hi guys,
this morning I tried, in an indoor test environment, with other two routerboard (RB433AH) with wireless N card (R52N) without antenna connected and I didn’t have CCQ and througthput problem: I had 120 Mbps TCP aggregate througthput!
Then this afternoon I install the routerboard RB433AH in an outdoor link (20 km) and in this case CCQ and througthput go down…sigh !
I tried to enable only 20 Mhz channel with nstream and 40 Mhz channel without nstream, but problem persist!

Could anyone help me please?

Thanks

Regards

nranieri · September 3, 2009, 4:24am

Unless I am missing something, you did not mention the frequency you are using. I have seen this issue before and usually attribute it to radio contention. Especially if you are talking about 2.4ghz with only 3 available channels. If already using 5ghz, a different channel may help. A frequency usage test on both sides would be useful.

mktwifi · September 4, 2009, 2:51pm

Hi,
I am using a 5 Ghz frequency, and I have just tried a lot of frequency with same result.

Regards

Muzaki · September 21, 2009, 11:50am

I know it’s an old topic, but did you solve the problem?

anghelescu · September 22, 2009, 7:20am

hello, i hope that we solve the problem. to transport data between to rb433ah an r52n card we use EOIP and a bridge between ether1 and eoip, and when we make high traffic, the signals up/down very much, it is no stable. but if we disabled the eoip, and we make bridge between ether1 and wlan1, it is ok, tha signals is fluctuating, but the link in not disconnect, and the CCQ parameter remain high, 85-95%…the wlan1 we make it station pseudobridge so we can add it to the bridge. i want to try it too so if we see that we solve the problem.

anghelescu · September 22, 2009, 7:23am

our link is at 35km, we try 40M full duplex, at 5.xGHz, and for the moment is ok…we hope that after 2-3 days the result it will be the same…