Community discussions

MikroTik App
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

r52Hn & MCS0 MCS7

Fri Oct 07, 2011 12:52 pm

apologize for my English
made a link on the cards r52Hn with channel width 20 with a single antenna. connected at a speed of 65Mb. but to my knowledge the speed should be around 130Mb. so I used Google and found that the reason is that the card supports only MCS0 MCS7 from which the rate depends. but also found that the other cards supports MCS15 that gives them the speed of 130Mb.
if I'm right, then why do these cards do not support MCS15?

and another question
found that MCS7 speed can be not only 65Mb but 72.2Mb, but it depends on what Guard Interva - 400 or 800. where in mikrotik this setting can edit?
 
User avatar
janisk
MikroTik Support
MikroTik Support
Posts: 6263
Joined: Tue Feb 14, 2006 9:46 am
Location: Riga, Latvia

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 1:49 pm

with only 1 HT channel at 20MHz all you can expect is 65MBps, you have to go 40Mhz HT channel and then get expected 130/150MBps airrate. and with 2 channels @40MHz HT channel up to 300MBps.
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 2:03 pm

do you mean this?
HT.jpg
with only 1 HT channel at 20MHz all you can expect is 65MBps, you have to go 40Mhz HT channel and then get expected 130/150MBps airrate. and with 2 channels @40MHz HT channel up to 300MBps.
are you talking about the standard N or just about card r52Hn?
You do not have the required permissions to view the files attached to this post.
 
User avatar
janisk
MikroTik Support
MikroTik Support
Posts: 6263
Joined: Tue Feb 14, 2006 9:46 am
Location: Riga, Latvia

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 2:47 pm

screenshot just shows that ou have 1 chain enabled, but it does not contain no information about HT channel width you are using.

You should select 20/40MHz HT above or below depending on frequency (channel) you are on. Then higher rates will be available. To go even higher enable chain1 rx and tx.
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 3:21 pm

from you, I get the wrong answers that I want to see

let's go another way please

I ask the question and you give your answer - yes or no


is it possible to make theoretical 150Mb link connect with one r52Hn card and one polarization antenna (only one antenna) and 20MHz channel width on both side of link?
 
ucheobere
just joined
Posts: 2
Joined: Fri Oct 07, 2011 3:28 pm
Location: Lagos

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 3:40 pm

HI All,
I feel very disappointed that these throughput test results can only be obtained UDP test. I have never achieved anything higher than 30Mbps on TCP test. TCP is the real world... does this mean that in the real world we cannot do more than 30Mbps?
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 4:28 pm

HI All,
I feel very disappointed that these throughput test results can only be obtained UDP test. I have never achieved anything higher than 30Mbps on TCP test. TCP is the real world... does this mean that in the real world we cannot do more than 30Mbps?

it can be more
http://www.youtube.com/watch?v=kebKgu0t1O8
look at 4:30
 
JorgeAmaral
Trainer
Trainer
Posts: 199
Joined: Wed Mar 04, 2009 11:53 pm
Location: /ip route add type=blackhole

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 6:42 pm

HI All,
I feel very disappointed that these throughput test results can only be obtained UDP test. I have never achieved anything higher than 30Mbps on TCP test. TCP is the real world... does this mean that in the real world we cannot do more than 30Mbps?
To be able to achieve more throughput on TCP you need to enable NV2.
 
JorgeAmaral
Trainer
Trainer
Posts: 199
Joined: Wed Mar 04, 2009 11:53 pm
Location: /ip route add type=blackhole

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 6:44 pm

from you, I get the wrong answers that I want to see

let's go another way please

I ask the question and you give your answer - yes or no


is it possible to make theoretical 150Mb link connect with one r52Hn card and one polarization antenna (only one antenna) and 20MHz channel width on both side of link?
No.
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

Re: r52Hn & MCS0 MCS7

Fri Oct 07, 2011 9:14 pm

JorgeAmaral
is it possible to make theoretical 150Mb link connect with another card and one polarization antenna (only one antenna) and 20MHz channel width on both side of link?
 
JorgeAmaral
Trainer
Trainer
Posts: 199
Joined: Wed Mar 04, 2009 11:53 pm
Location: /ip route add type=blackhole

Re: r52Hn & MCS0 MCS7

Sat Oct 08, 2011 1:25 am

JorgeAmaral
is it possible to make theoretical 150Mb link connect with another card and one polarization antenna (only one antenna) and 20MHz channel width on both side of link?
No, for MCS7 with 20Mhz channel bandwidth: 65Mbps

This is from the 802.11n protocol.

The only way to get more bandwidth is with two chains (antennas), or with 40Mhz channel bandwidth.

Please see MCS table here: http://www.simandl.cz/stranky/elektro/m ... nt/mcs.htm

Good weekend,
 
ddooll85
just joined
Topic Author
Posts: 13
Joined: Fri Oct 07, 2011 12:07 pm

Re: r52Hn & MCS0 MCS7

Sat Oct 08, 2011 1:58 pm

thanks for help
one mo questions left - what about Guard Interval. where I can change it?
 
JorgeAmaral
Trainer
Trainer
Posts: 199
Joined: Wed Mar 04, 2009 11:53 pm
Location: /ip route add type=blackhole

Re: r52Hn & MCS0 MCS7

Sat Oct 08, 2011 5:28 pm

thanks for help
one mo questions left - what about Guard Interval. where I can change it?
From console: /interface wireless set wlan1 ht-guard-interval="any or long"

In winbox go to wireless and then ht tab, and there you have an opion called ht guard interval.
 
ucheobere
just joined
Posts: 2
Joined: Fri Oct 07, 2011 3:28 pm
Location: Lagos

Re: r52Hn & MCS0 MCS7

Sun Oct 09, 2011 8:08 pm

HI All,
I feel very disappointed that these throughput test results can only be obtained UDP test. I have never achieved anything higher than 30Mbps on TCP test. TCP is the real world... does this mean that in the real world we cannot do more than 30Mbps?
To be able to achieve more throughput on TCP you need to enable NV2.
From the description of Nv2 I think it'll only increase throughput on PTMP network because of the TDMA technology its built on. I was referring to PTP network. However I shall test Nv2 again and give you a feedback. Thank you!
 
User avatar
janisk
MikroTik Support
MikroTik Support
Posts: 6263
Joined: Tue Feb 14, 2006 9:46 am
Location: Riga, Latvia

Re: r52Hn & MCS0 MCS7

Mon Oct 10, 2011 1:31 pm

NV2 will help you on PTP link too. 2 grooves "talking" NV2 could saturate 100Mbps Ethernet link in one dirrection with TCP.

About your MCS questions - i can say that according to 802.11n higher rates are only available with wider channel or additional channel. If you have only one free channel and use of 40MHz HT channels is out of the question, then using 2 channels is good option. It is not limitation of RouterOS, just complying to standard.

Who is online

Users browsing this forum: Bing [Bot], popecix and 25 guests