Problem with wireless n speed

Hi All,

I bought AR922X wireless card of TPLink. I configure wireless n, and have very weird issue.
My TX rate is 130 (As is suppose to be, but RX rate can never be more that 65). Find attached screens for my configuration.

Does anybody have any similar problem?

Thanks in advance

P.S. If you need any additional information feel free to contact me.
ScreenShot004.jpg
ScreenShot003.jpg
ScreenShot002.jpg

Do your devices have 2 chains?

Yes it has.

You can find more information about my card here:
http://www.tplink.com/en/products/details/?model=TL-WN851N

Same problem here.

I’ve already posted it with different topic, regarding about slow N wireless, but I did not got any answer.

Yes, my RB751U is capable to communicate with 2 chains with the two integrated antenna.
Yes, my client wifi card is capable to communicate with 2 chains.

Yet, I’ve still got to connect only with 130 Mbits speed, and the real throughput is around 25-35 Mbps.

Seems to be, something is wrong with AP-Bridge mode, because who has problem, want to use this kind of mode.

Hi,

Which kind of security do you use?
I have the same issue before I switch from tkip to aes. If you use tkip it will not work much faster than wireless g.

Do your clients connect with 130MBs uplink and downlink?

I use aes only. 130mbps downlink and ~105mbps uplink (or the opposite, depending on which side I see).

First: If you have issues with a wireless link, switch off all security. Firt get your link right, than setup security since it can have effects on the throughput.

If you have two different connection rates, special in 802.11n (MIMO) than it usually means that one of the chains is not having the same quality wireless link as the other.
This can be that one of the chain’s antenna’s can be poorly connected.
It can be that one of the antenna’s energy radiation or receipt is more blocked by something than the other.

For instance, what is the polarity of both? Is each chain’s link both on receiving and sending end having the same polarity? (So when chain 1 on your card is vertical, you shouls have the antenna of chain 1 on the other end also vertical.)

Also, if both vertical and horizontal antenna’s are used than it can also be the horizontal radio wave is having more problems to reach other end than the vertical or vice versa.

So there can be many variables playing that can cause the difference. But it has nothing to do with the “AP-Bridge” mode because that just means unit works as AP. (And not as client.)

After disabling the security, and aligning the antennas on client side (on router side, the RB751U has integrated antennas, cannot do anything), the results are the same.

Maximum 130mbps connection link, only 25-35 mbps through rate.

And what I meant with the AP-Bridge, that there are some people with this exactly same issue, and they are also using AP-Bridge mode.

make sure that you use at least RouterOS v5.7 and second suggestion is to try out the advanced rate-selection which ca be changed from the Data rates menu. You should do that on both AP and the Station of they are both RouterOS.

Is this ever fixed?
I have the exact same problem, i never go above the 130Mb
And if i place a cheapo TP-LINK WR1043ND rights beside it then i get on that router easily 200+ speeds
I have a 120Mb/s internet connection (connected to the RB600A) and with the TP-LINK connected over 1Gb kabel to the RB600A i get almost that speed 113Mb/s or something on speed test
if then connect to the RB600A directly (which is the router/wifi) i never get more then 40/50MB/s because then max is 130Mb (status of windows tells me that as does the registration tab on RB600A itself)

I had that problem here. Turns out my RB411AR with an R52n and a couple of dipoles was getting interference from my tower when using the extension channel. If I got the right channel it would work at 300mb but it would back off when ever decent traffic was going across my ptp shot.

It is much more reliable in 20MHz mode.