I'm pretty confused

[ljenkins]

Hey guys. I am trying to uptrain on this 802.11n stuff. I have a few newb questions.

1. If I am running 2 bulletm2's with a parabolic 24dbi antenna's. will I be able to use the MCS0-MCS7 codes? and their speeds?

The reason I am asking is to better understand the multiplexing/spatial stream theories. From the charts I have been looking over MCS0-7 only uses 1 spatial stream. Could this "#"=spatial streams be applied to antenna's necessary to use the coding method? i.e (mcs12 has 2 spatial streams and requires 2 antenna's on both ends?) or at least both antenna's capable of running cross-polarity or w/e to emulate 2 antenna's?

brain is hurting a bit. i'll wait for some reply's.

thanks in advance for help.

[lncommunications]

Yes the Bullet M's use the rates MCS0-MCS7, but no more as they are single stream only.

[ljenkins]

I know that the bullets are single stream and use msc0-7, but my question(s) were more directed at the stream-to-antenna relation. More streams = more antenna's?


**edit**
Also. If you are able to use 1 antenna with ability to cross-polarize or whatever means to emulate 2 antenna's from 1 physical antenna could their be a revision in order as to what the bullets are capable of? Or is it not possible to emulate 2 antenna's from 1 phy?

If that's the way that works.

[WHT]

I can see what you're asking. This might answer your question.

* MSC 0-7 uses a single antenna, that's where you get the 1x1 description.
* MSC 7-15 uses two antennas **with two antenna ports**, or 2x2. It doesn't matter how you have those antenna set up - may it be two vertical ones or two cross polarized one.

So if you use a single antenna port 1x1 radio with two antennas, all you have done is fed that one radio signal into an antenna splitter to feed the two antennas. It is not going to be 2x2, even though you have two antennas.

[agsweeney]

This is actually kind of interesting... (and possibly more confusing)

if you look at the output from "athstats" on a PowerStation5, you will notice this in the output:

Antenna profile:
1 switched default/rx antenna
Antenna profile:
[1] tx 4851086 rx 5009975


And on a Bullet5M:

Antenna profile:
2 switched default/rx antenna
[0] tx 0 rx 9720531
[1] tx 9643102 rx 45798

[UBNT-Mike.Ford]

This is actually kind of interesting... (and possibly more confusing)

if you look at the output from "athstats" on a PowerStation5, you will notice this in the output:

Antenna profile:
1 switched default/rx antenna
Antenna profile:
[1] tx 4851086 rx 5009975


And on a Bullet5M:

Antenna profile:
2 switched default/rx antenna
[0] tx 0 rx 9720531
[1] tx 9643102 rx 45798


Hello,

What version of the software are you on?

Thanks,

Mike

[ljenkins]

thnx guys. I think I understand what I need now. It seems a bit unfortunate for the bulletm's due to them only being possible of 1x1. fantastic units (i got 4 of em), but I WILL be getting my hands on a couple of those rockets as soon as they ship, and We will need to be running around mcs12,13. I guess if you have clients that are kinda far and NLOS you could always run them on another rocket, but man I love those bullets.
Thanks again for clarifications.

[agsweeney]

Hello,

What version of the software are you on?

Thanks,

Mike

XM.v5.0.1 as of last night.

Current snippet from "athstats":

%<----------------------------
Antenna profile:
2 switched default/rx antenna
[0] tx 0 rx 18419871
[1] tx 19616471 rx 45798
%<----------------------------

[drwho17]

thnx guys. I think I understand what I need now. It seems a bit unfortunate for the bulletm's due to them only being possible of 1x1. fantastic units (i got 4 of em), but I WILL be getting my hands on a couple of those rockets as soon as they ship, and We will need to be running around mcs12,13. I guess if you have clients that are kinda far and NLOS you could always run them on another rocket, but man I love those bullets.
Thanks again for clarifications.
Why do you expect that to help with distance/NLOS? I'm interested to see if it does for sure, in which case I'll use Nano's and whatever Ubiquty comes up for their PS replacement.

[WHT]

I guess if you have clients that are kinda far and NLOS you could always run them on another rocketThe Rocket's MIMO might help on *some* distance problems, but not likely.

And MIMO is most certainly not the "magic bullet" to solve NLOS problems, though it *might* help if you have just a few trees in the way.

[ljenkins]

I get that part of it, I was just saying for those far out that had to have something over mcs7 a rocket would be good for that due to the fact of antenna choice and the rocket probably has good power. with nano2's your stuck at integrated and the 400mw. unless you want to pigtail some antenna's, but by then its worth getting a unit that you can easily slap an antenna (or two) on.