The MIMO-Stuff is done by the Wlan card so it should not impact main cpu.
Is that really true? If so, how to explain that my backhaul radio of the same rb433AH could handle more througput when the AP radio is switched off? (Bandwidth test done from router outside the actuall radio link members). If the radiocard would handle the mimo stuff than switching one card off would have no impact on the other. (When the traffic the bh card has to handle is still the same = bw test fm other board)
Just by making my full client network all 'n' instead of the mixed I had before also improved the backhaul radio..... So imho the cpu of the board must be involved in the work the actual radio is performing. If not I might as well use slower boards.... al they have to do is passing the traffic ....
Using one AP V and one AP H you might increase frequency capacity at the tower.
Yes true. But not very realistic in everday setup. Existing ('a') networks are little by little upgraded to 'n' networks. That goes slow due restrictions in resources. So I start with having the new incoming clients getting a 'n' radio. Than, as soon as the money is available, I put a 'a/n' able AP as replacement for the old 'a' AP. (That is left for backup, but switched off). Now little by little boards from existing 'a' clients are wherever possible replaced by 'n' type boards in the same (RIC) antenna's to keep the cost of the replacement under control.
So here is the 'mixed' network now. For months the new 'n' AP has to deal with a whole bunch, but slowly degreasing, amount of 'a' units working all in one polorization, and a slowly incraesing amount of 'n' type of CPE's that still work in one chain. On some of my new networks I am also faced with the fact that although the new AP is H+V polorized, not all CPE's can be made dual chain. (At 15km distance I need a BIG antenna on the client's premises to get a sufficiant enough signal on a dual chain CPE. That is too costly for me, thus the client. So I can only serve him when I put an 'n' single chain (Groove) on a 27 or 30dBi antenna.
So now I have the choice; should I make no.1 client V-pol and than the 2nd H-pol and the 3rd V-pol again etc. or should I put them all in the V-pol (or H-pol) chain? (There are also some duo pol client attached to same AP using both chains)
Basically the issue here is; is there a need to balance out the usage difference over the chains of the AP or not?
The H/V Separation helps with tighter channel spacing.
True. But not always the most practical thing to do.
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Rudy R. Puister
WISP operator based on MT routerboard & ROS.