Pre-N Speed And Coverage Claims

The US use 800% and 600%. We felt that it would be better for the EMEA Region to use the "X" instead of %. The key to these numbers is to consider speed at distance and coverage versus range.


In close, 802.11g will give you 22Mbps, and Pre-N will give you 45Mbps. This is 2X. As you move further away from the AP, data rates will drop. The testing that we have done show that as the data rates for 11g and Pre-N drop, the difference grows. See example graph below. This chart shows 2X in close, as distance increases, the difference grows to 3X, then 4X then 5X then eventually Infinitely better as Pre-N still has good data rates and g is completely gone. On average in the Tolly testing and the testing we have done, we have seen up 8X the speed at range when both 11g and Pre-N could produce results. To be a little conservative, marketing chose 6X or 600% as the number.


As for 800% (8X) the coverage area, you need to remember we are talking COVERAGE, not range. Consider that the coverage area is a circular pattern. If you increase the radius of a circle, you increase the area of the circle greatly. Area of a circle is PI (3.141) multiplied by the square of the Radius. So you can see even a small change in the radius produces a large change in the area. Coverage area is more important than range in a single direction. We also know that range in one direction can be different than range in a different direction due to obstacles, etc.

The most important point is this: You can't put actual numbers to range because environments differ greatly. But, you can see the same 6X and 8X in any environment. This means that no matter where I'm testing, I'm going to see 8X coverage and 6X speed improvements at range. For this reason, we are staying away from putting hard numbers to the range and speed. How we want to express the improvement is 8X Wider Coverage, and 6X Faster Speed.

Speed over Distance
Distance Feet 15 50 75 100 150 200 250  
Distance Meters 5 16 23 31 47 63 78  
11g Mbps 22 14 10 5 3 0 0  
Pre-N Mbps 45 35 30 22 16 8 5  
Increase (%) 205% 250% 300% 440% 533% 800% 500%  
Increase (X)             2             3             3             4             5           8             5  


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