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5 Ghz P2P Link expected bandwith?

Posted: Fri Feb 01, 2013 8:07 pm
by Trackboy
Hello everybody!We are new in Mikrotik devices,we have got a 1 km backhaul link:

Point A:24 dBi 5 Ghz Grid,RB 411 GL with R52nM working in AP Bridge with Nv2
Point B:27 dBi 5 Ghz Grid,RB 411 GL with R52nM working in Station Bridge

CCQ:80-100%,TX/RX Signal Strenght:55-55 dBm,Signal to Noise:60 dB

Our result is only 14-15 Mbit/sec TCP speed

I want to insert here picture but i don't know how to

Thank you for your help

Re: 5 Ghz P2P Link expected bandwith?

Posted: Fri Feb 01, 2013 8:33 pm
by InoX
80-110mbps

Re: 5 Ghz P2P Link expected bandwith?

Posted: Fri Feb 01, 2013 9:00 pm
by Trackboy
So,this is sure interference problem,we are planning later 20km link with these devices,what do you think?What is the expectable bandwith from this kit?

Re: 5 Ghz P2P Link expected bandwith?

Posted: Fri Feb 01, 2013 10:52 pm
by markmcn
We saw issues on a very short hop with a pair of RBSXT's if I recall correctly the way it was we got 80~90 Mbps UDP traffic however when it came to TCP traffic it topped out at 25 ~ 30 Mbps spent a while looking at this If I recall correctly it was down to queue size/type on the interface. If you need a work around for this try and pipe your traffic down an EOIP tunnel as this encap's all traffic in a udp header. don't forget to allow the MTU's out to allow for the extra overhead
hope this might help even if the UDP tunnel is between the wireless interfaces.
Hope this helps

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 8:06 am
by jo2jo
you could quickly try a pair of MT Sextants or SXT's in 5ghz to rule out hardware or cable / antenna / power supply issues with your current setup.

they are very inexpensive 99$ a pc OR LESS and you can just use them for testing when you are done (or use them for the link)

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 9:41 am
by Trackboy
Thank you very much for your answers,we are beginner in Mikrotik devices,but this link is properly for learning.

At this moment we don't want to buy another devices,maybe later.We assume the Mikrotik's Bandwith measure is not correct

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 1:22 pm
by Lakis
Can u post nv2 UDP test
and test with nstreme
Do u use only one polarization
1km 24-27db antenna is too much - I m not saying its not ok but why
Have u ever try doing this setup with SXT - it is going to be much much cheaper and better and smaller

Just to share this I have also bad experience with R52nM I m not going in to detail how and what, this card have same chipset as R52Hn exept Hn is 2db stronger but outside it is inferior to nM - dont know why
Also my Distributer confirm this - He have same complaints from some clients - but maybe I m wrong.

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 5:48 pm
by Trackboy
How can i insert here picture?Sorry for my bad english

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 7:25 pm
by Lakis
lasadd.png
First Browse your file than add the file
and at the end place inline

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 7:55 pm
by Trackboy
The place inline is does not appear for me

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 7:59 pm
by Lakis
The place inline is does not appear for me
First browse and add the file
Than it will appear

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 8:21 pm
by Trackboy
Ok,here is the picture,the result is same with 20 TCP count too

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 8:31 pm
by Lakis
finally Trackboy picture :)

Signal to Noise is a bit high - U can change some freq
but it seam fine u use only one polarization u should get something around 40-50 mbits
I m not sure if 411 can generate so much traffic
and when u do testing add TCP connection count 10 or 20 (because nv2)
Can u do UDP test also test it with nstreme
And u dont have to add picture just post the results.

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 8:48 pm
by InoX
Why tcp count 1? Set it to 20 as it is default.
Any RB 4xx or 7xx with 400mhz can generate ~30mbps and the ones at 680mhz can generate ~100mbps. All TCP speeds.

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 9:04 pm
by Lakis
Why tcp count 1? Set it to 20 as it is default.
Any RB 4xx or 7xx with 400mhz can generate ~30mbps and the ones at 680mhz can generate ~100mbps. All TCP speeds.
Only my RB800 can generate 100mbps+ :)

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 9:17 pm
by InoX
110mbps my RB450G :-P

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 9:21 pm
by Trackboy
Ok,i will test nstreme with UDP,with 20 TCP count the speedtest result is same

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sat Feb 02, 2013 9:25 pm
by InoX
did you try a file transfer, torrent or anything else? Maybe the only problem is btest...

Re: 5 Ghz P2P Link expected bandwith?

Posted: Sun Feb 03, 2013 7:40 pm
by Trackboy
Ok,seems to be the 80 meters utp cable on ap side between RB2011 and RB 411 GL,not ok,TCP speed only 13-14 Mbit sec,we have to change

So the 411 GL capable of 100 Mbit/sec TCP speed?(50/50 Mbit/sec?)

But with the new Mikrotik mini PCI card the experience is not something good?

Re: 5 Ghz P2P Link expected bandwith?

Posted: Tue Feb 05, 2013 11:05 am
by gjelsvik
Try a UDP test before replacing cable.

Re: 5 Ghz P2P Link expected bandwith?

Posted: Tue Feb 05, 2013 7:09 pm
by karina
I am thinking a pair of 24dbi grids is a bit overkill for 1km. I would have used a couple of SXT's :-)

Re: 5 Ghz P2P Link expected bandwith?

Posted: Thu Feb 14, 2013 9:19 pm
by Trackboy
Ok,we found the problem,411 GL Ethernet port is not working properly,i have to send back to the store,where i purchased,411 U RB capable of 62/Mbit sec TCP speed with this grid antennas