Configuration A
APadv+dish---------8km-------( SM1+dish-CMM-APcluster1; SM2+dish-CMM-APcluster2; SM3+dish-CMM-APcluster3);
Configuration B
BH20+dish-------8km-------BH20+dish-CMM-APcluster2---------( SM1-CMM-APcluster1; SM3-CMM-APcluster3 )
I hope these two possible network configuration are clear enough:
basicly we have one high site about 8 km from a town where we have 3 sites with APclusters.
what is the best way to connect the 3 sites to the one 8km away where the back houl arrives :
- with 1 APadvantage on a 6° dish comunicating (with good signal) 8km away with three SM each directly conected through a CMM to a AP custer
or
- with 1 p-p BH20 conected to the central cluster which comunicates to the other two clusters through 2 SMs
I am assuming that one of the 3 distant sites can see the other 2 distant sites. If so, the optimal solution is a BH from your main site 8km away to the site that can see the other 2. Then backhauls from that site to the 2 other sites. I would highly recommend routers at all your sites but you could get away with placing one at the site that is the central point. we place routers at every antenna site. you can either make your own with a sokeris box and linux or we now buy imagestream envoy routers.
whenever we’ve tried to use an AP and an SM or multiple SM’s as backhauls it always comes back to bite us later because the performance once under a substantial load will never be the same as with a true backhaul.
if all those backhauls are too expensive you could probably get away with your first or second idea. The first would probably be the least expensive. BUT i would plan on switching everything to backhauls once you have a substantial customer base.
hope that helps!
as stated by seano.
Are you looking for the cheapest solution ?
How many AP’s on each cluster what frequencies are being used at each cluster ?
How many SMs connected to each cluster.
The BH that arrives at high point is it a master or slave ?
The AP on the high point… how is dealing with timing sync.
vj wrote: as stated by seano.
Are you looking for the cheapest solution ?
let's say the best compromise
How many AP's on each cluster what frequencies are being used at each cluster ?
at the moment there are 3AP per cluster
How many SMs connected to each cluster.
each cluster has now up 8-10 SM but will increase
The BH that arrives at high point is it a master or slave ?
it's a slave
The AP on the high point... how is dealing with timing sync
All BH and AP are GPS sync throught the CMMmicro
.
Hi Steven,
As Seano pointed out, everytime you make a compromise with canopy, you are just asking for trouble.
Both your setups will work.
Ideal setup will be BH link to each cluster.
A few things to bear in mind when doing this:
The SM at each cluster needs to be as far as possible from the AP’s otherwise it may interfere. Try to keep the frequency between the cluster and the SM as wide as possible.
Are your clusters H/W scheduling, if not upgrade to 7.3.6 and switch to H/W. The SM at you want to put at each location, I assume they are non advantage, if they are advantage there may be an issue with interference due to timing sync.
It is possible, but you may have alot of silly unstability issues unless you get the whole thing finally tuned.
sorry can’t give you a definate yes or no, but i’ve had similar decisions to make.
Maybe this will make things a little clearer:
For 5.7GHz there are 22 available channels. Each channel is 20MHz wide, so you only have 6 non-overlapping channels available.
If you have a 6 AP cluster and each AP is on it’s own channel, there is no room left for the BH channel. In this case you could get the BH to work with the cluster, but you would need to make sure you have A LOT of vertical separation between the BH and the AP cluster. You would want to put the BH on the same channel as an AP that is facing sideways to the BH in order to get maximum rejection. While this MIGHT work out, you will more than likeley have problems. Better to use a different band BH such as a 5200BH.
However, if you reuse the frequencies on opposing AP’s, you would only be using 3 of the non-overlapping channels. Then you could put the BH on it’s own channel.
Example of frequency reuse:
- AP North and AP South = 5735
- AP N East and AP S West = 5760
- AP S East and AP N West = 5785
- 5700BH = 5840
All AP’s must be configured the same in every way except color code and frequency selected. There is enough separation from the AP’s to the BH that you would not need alot of vertical separation. Again, it would be better if you just use a BH in a different band.
In some cases frequency reuse is required when some of the spectrum is in use and you do not have all 22 channels available.