Anybody already implemented a stable working AP network with clients all working in ´n´ (a or b).
UBNT have their out of the box Airmax setups. But I’d like MT more as beeing more reliable.
But so far seen many PtP setups but not too many PtMP with mimo.
Now with the new TDMA of MT almost ready for use and the more kristallized ´n´ protocol with MT it is time to setup my first ´n´ PtMP network.
I’d like to work with sector antenna’s but what are the advices? Use one Hor. and one Vert. Polirized separate sector side by side?
These antenna’s have to be relative of the same make/gain/sector?
Or can these antenna’s be separated a bit? Maybe even better to separate them?
Anybody aware of already manufactured two-in-one sector antenna’s? (Like the Airmax sectors of UBNT, but without the board/radio)
I have the feeling such mimo PtMP networks are still a bit in a development stage, even amongs forum users. But mayby someone already has good advices on do’s and don’ts!
Airmax sectors have RPSMA or SMA connectors, don’t remember, but they can be used with other brand radios.
My test N runs I’ve got a 12dBi antenna above the AP and a lower gain below. I figured that should help with blind spots up close.
Not that this is a great source of “how to do things right”, but several Linksys draft N routers have 2x 2dBi with a higher gain antenna in the middle.
Right now I’m doing everything the same polarity and using single chain clients. I hope Pac wireless or ARC comes up with an affordable dual polarity client.
There are some dual polarity antennas out there, but they are not cheap.
Ok, that is interesting. So I can use the AirMax mimo sector antenna’s with MT routerboards and radio’s.
They have very need antenna’s by looking on the picture. I am making an new topic of that to get the attention. Mayby some guys already have experiance in the combination?
I would say that if your connect V-pol to Ch1 and H-pol to CH0 you should stick to that on the other end. MT’s SXT’s are connected like that so I maintain it throughout the network.
To use both V-pol and H-pol you off course have to enable both chains…
In you AP you have the conn. rates set to default. Set them to manual and start testing until you find a set that works for you link. By having them enabled the radio tries to use them all and always is looking for the highest one. But since spectrum conditions are never stable enough to have the best onces stable the radio starts to switch the rates up and down which kills the totol performance of the link.
My ´n´ links have all the a/b/g rates disabled and only the lowest HT rate with only 2 or 3 extra rates higher up. That works for me.
P.S.
cbrown is right, only post your question once or twice should be sufficient.
This is typical behaviour of the desperate. But understanding things need time and a lot of reading and understanding. Quick solutions don’t exist. I’ve been there…
What was a bad decision from MT as most Wisps run their Network in V-Pol (comes from the fact that omnis
with H-Pol are very rare). So our dualpol sectors where V+H before SXT arrived.
As I understood if both chains are enabled on both sides this is no problem.
I can’t agree more on that! I would say this is a real miss from their design department.
As I understood if both chains are enabled on both sides this is no problem.
Yes, that works, or with the CH0 Tx disabled it works too. No real need to hang the units on their side. I have some 30 of these working this way now in my existing V-pol network without any problem. MT advices against this which I don’t agree. But we´re drifting off topic now…