I agree with Stephen/Steve's post. Get someone to do the design, pre-installation survey, implementation and post-implementation survey. There are alot of things that can go wrong and there are misconceptions that need to be ironed out. For example:
There are 50+ offices from 20-600 users.
Ok. There's no biggie with the statement above. But it will not "gell" with the statement below:
User should be able to roam everywhere.
Alot of executives believe (incorrectly) that WLAN roaming and mobile/cell phone roaming are synonymous. This perception needs to be taken with caution.
You have 50+ offices. Ok, I get this. Now unless you are going to tell me that the "open space" between each offices will be covered with your WLAN then there's no such thing as "roaming". You will get the feeling of "roaming" when you are, for example, in an office with wall-to-wall wireless and you walk from one end of the building to the opposite end and you are still continuously on the wireless. This is possible because your client was able to continuously connect to the same WLAN and the WLAN handed your client from one WAP to another.
