04-28-2012, 10:04 PM
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Join Date: Jul 2011
Location: Planet Texas
"Standards" are only as good as the the metrics used to define them.
Let's look at that referenced chart.
Max Speed: 54 Mbit/s
Distance (outdoors): 120meters or 131yards
I have dozens of links over 22 *MILES* using 802.11a 5.8 GHz. So that proves how inaccurate the "131 yards" is.
Standard: 802.11n MIMO
Max Speed: 450 Mbit/s
Distance (outdoors): 250m or 273yards
How can that claim be made without specifying the frequency used. I have 2.4 GHz links using 802.11n modulation that I wouldn't trust over 400 feet and some 5.8 GHz links I fully trust over 30 miles.
A second-chain only gives you a 3 dB improvement. It takes 6dB to double your range, so how can the chart explain twice the distance by using 102.11n?
Furthermore...It's speed or distance, pick one.
Let's say you have a one mile 10 Mbps link (typical for 102.11b or single-chain MCS-0) and I jump to MSC-7 (150 Mbps with 40 MHz channel width)...I take a 24 dB loss in performance. That means my distance is reduced to a mere 300 feet. I traded distance for speed.
Last edited by WHT; 04-28-2012 at 11:26 PM..