Which Mikrotik wireless 5Ghz APs and anntennas type i can use to make up 360 degree basestation?
Do you anticipate LOTS of usage?
You may only need one RB and an omni (wip) antenna.
If you think your customer base will require more than one AP you need to decide how many sectors you need.
Example: 3x120°, 4x90°, 6x60° etc.
We really like superpass and Laird/Pacific Wireless antennas and patches.
thanks for the response.
I need a basestation for about +300 users covering 2km square, usage mostly video steaming, games etc
i have the following questions:
- which type of AP?
- how many APs?
- how many sectors?
- What type of anntennas?
the place is relatively flat with three storey building almost at the centre where im planning to mount 3m mast on top.
regards
i suggest u for rb435g with 4 r52hn radios and 4 sectors
Thank you very much for the response.
one other question:
which type and name sectors?
thanks
the best (at least to my knowledge) and the cheapest solution for wireless 5 GHz is omni 12 DBi antenna
try this
http://www.l-com.com/item.aspx?id=20576
if you want better but expensive solution use sector
the practical is 2 sectors or 3 sectors antenna as if you add more than 3 you will have interference problems
so, better is 2 sectors 180 degree or 3 sectors 120 degree
the higher the gain (DBi) the better
here a list
http://www.l-com.com/productfamily.aspx?id=6343
suggest to use wireless card with higher watt
like 600 mw or 1 w
r52hn radios is not good option here ( it use MIMO technology)
so,the antenna should be use MIMO technology to get the best performance of the card)
Hi,
It would be useful to know what your clients are going to have on their side of the link.
Are the units going to be regular, SISO or MIMO units?
Are you going to supply the CPE yourself?
Are the CPE units going to be all mounted by yourself or by the client?
Before you decide on the AP side, you need to get the answers to the above or else you are going to get a few nasty surprises. Also, you need to think in terms of scale and also redundancy. If most are going to be streaming, there is no way a single RB unit is going to handle that load for 300 users. If they are business users, you can also expect a LOT of hassle if you have a single unit serving everybody and it goes down.
Rgds,
Mark.
NOT True! It is the cheapest solution. For 300 users an omni means one AP and you’ll find it almost impossible to have one AP serving 300 demanding customers. Your network will be a mess.
the practical is 2 sectors or 3 sectors antenna as if you add more than 3 you will have interference problems
Again NOT True. This may be the case in 2,4Ghz. But in 5Ghz you have 12 x 20Mhz channels that each have more separation then the whole 2,4Ghz band has.
You can even increase the amount of channels if using 10Mhz wide bandwidth channel. Than suddenly you have 24 channels to use (with half the speed).
So, as long as the sectors are spaced sufficiently (around one meter, depending on antenna and depending on channel separation) you can divide your 360 in 4 x 90 degrees, or 6 x 60 degrees or even more.
For redundancy you can than have one AP (or some overlapping sectors) on top on standby to take over from a failing antenna in the case that happens.
This scenario also implicates you end up using several routerboards.
First because no present routerboard will be able to server 300 wireless clients, even if they are served by 2, 3 or 4 cards (rb800). 300 demanding clients is just too much.
Secondly, a professional installation means you want to avoid as much as possible radio’s interfering with each other. Each card radiates some of its energy out from even the little connector that connects antenna to radio. So if you now put cards on top, or side by side of each other, the increase the risk of problems.
Third, every cards produces heat. Put 4 on a rb800 and you need quite some cooling to keep them all at reasonable level.
Fourth, concentrating too many station on one single unit make the system also more vulnerable for big problems. You’d rather loose one rb433AH with 30 clients at a time than one rb800 with 4 cards and 120 clients on them!
From this 4rd argument you can also distil that a figure of 30-50 clients per radio/AP/sector is sort of a maximum. It depends a bit on what kind of clients with what devices are where to be server against what quality level.
the higher the gain (DBi) the better
Also NOT True. Usually higher gain means smaller antenna beam. This can be either in the horizontal pane as in the vertical.
If you tower is high and you use a high gain sector you have the change it will ´overshoot´ close range customers. If you aim it at these close range stations, it might not reach the ´far away´ customer.
suggest to use wireless card with higher watt
like 600 mw or 1 w
NO. First because in most countries that is not allowed. And you don’t want to jeopardize your business because of this. Only use high power if you need very long cables to antenna. But in that case client station also need very high power because on both ends power levels need to be sort of in balance. If you use long cable in AP with high power output, the signal might reach station. But if station is sending on normal low power, the attenuation of the long cable in the AP make the receive signal strength in AP very low with degrading performance of the network as an result.
Secondly, high power is usually (if not to overcome the cable losses) only of use in very long PtP links (back-hauls). For AP it often makes things worse than better. If you need high power to reach distant client you basically ´blast´ short distance client out of the sky.
Also, the higher the power levels, the more radio energy is pumped in your spectrum creating bigger changes for interferences to yourself and others…
To reach distant stations it is better to use high gain antenna’s on their end.
r52hn radios is not good option here ( it use MIMO technology)
Again WRONG. The r52Hn cards are good cards to use in normal a/b/g mode too. The mimo technology only gets used if you set the radio to use it. Otherwise it is just a very good normal card.
thanks for enlightenment
first in regard of the antenna, I said to my knowledge and to ignore the number of the users (no AP can handled 300 users so, must be multiple APs)
second in regard of the frequencies, I was thinking of 2.4 GHz when I posted that so, you are 100% correct
third in regard of the higher DBi, need mid-way solution .can you suggest ?
forth in regard of the r52hn, I was aiming to clear that it use MIMO technology, so the antenna I suggested does not have that.
by the way HOW much the watt is given by r52hn?
my best regards
Regarding the dB of the antenna you need to tell me how high the tower is in comparison to the clients you need to serve. At which distance are the clients located? How are they grouped? (Are they clustered or evenly spread over the 360 degrees?)
How much cable (and what kind of) is in-between antenna and radio? (You need to know your cable losses.)
It needs some background information/knowledge to give an appropriate advice on what antenna’s might be the best solution.
As the R52Hn can both work in the legacy and mimo mode, you have to select the appropriate antenna for the mode you use. For mimo this is best a dual polarized antenna where for the legacy mode a normal Vertical or Horizontal antenna is to be used.
Power on R52Hn is 25dBm which equals to just over 300mW when both chains are enabled (mimo use)
One chain only (a/b/g usage) is halve of that, or 3dBm less. (Which makes 150mW or 22dBm)
One extra tip:
To save on frequencies (you might need more somewhere else and the competition might need some) and on cards/AP’s you can also connect two sector antenna’s both direct to the same R52Hn card. (No splitter needed. These are a waste of signal) Both antenna’s are in full synch and each of the connector is ´alive´
This way you could use two smaller sectors with higher gain and/or better projected coverage than one sector for the same piece of the horizontal cake.
I have one AP running like this for some weeks and I must say it is a big success.
I had to cover a 180 degree sector. I could use one 180º sector but either had very little gain or it had a very narrow vertical bundle. (So it would ´overshoot´ close range clients)
I could also setup two AP’s each with their 90º sector but I am already short on frequencies in my region so it was hard to find a free one and my cabinet was already full with routerboard boxes.
(Also for reason of sharing same hardware for more stations this way reduces some heat production and probably less power.)
Now I still use both of the 90º sectors, but connected to one R52Hn.
Because the gain of these 90º’s is better than the 180º I would have used in the first option I have better receive and better send signals.
The vertical beam width of the 90º’s is also wider than the 180º one so I also have better projected coverage than one 180º could ever give me.