Tue Mar 28, 2006 11:06 pm
AFAIK, It does indeed require MTs on both ends, but since it is based on an Atheros hardware feature, that may not necessarily always be the case.
In theory (I have not actually measured it), 5mhz channels should give you 6dB greater SOM than 20mhz channels, since your spectral power density would be 4 times greater. Thus you could go twice as far, without having to drop to a lesser modulation, in theory.
However, you will, at best, get 1/4th the theoretical maximum throughput of a 20mhz channel.
Also, while 5mhz channels will be less vulnerable to adjacent channel interference, since they don't spread as far; they will be more vulnerable to narrow band in-channel noise, since they don't spread as far.
The number of clients you will effectively be able to serve with a given channel size will really depend on your environment, network, and goals. A yes/no answer isn't really possible.
Same goes for getting past obstacles, you have a greater power density (and so can withstand a bit more loss), but less spreading (fewer sub-carriers for OFDM to do it's pilot-tone equalization / M-P signal reconstruction thing with). Six of one, half dozen of the other? Not an easy question.
--Eric