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playground:faq:i_am_not_reaching_theoretical_wireless_throughput [2018/07/08 18:26] (current)
tmomas created
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 +====== I am not reaching theoretical wireless throughput ======
 +
 +**Issue:** The device overview shows that my devices are not connecting at full speeds.
 +802.11n throughput depends heavily on 40MHz channel width and additional antennas.
 +
 +  * iPad 1 : 802.11n certified but 1 Antenna, 20MHz only : max. theoretical throughput: 65Mbit/s
 +  * 1 Antenna, 40MHz : 150Mbit
 +  * Netgear WNDA3200 USB Stick: 802.11n , 2 Antenna, 40MHz : max. theoretical throughput: 300Mbit/s
 +  * 3 Antenna , 20MHz: 195Mbit
 +  * 3 Antenna , 40MHz: 450Mbit
 +
 +The iPad 1 is in compliance with 802.11n but delivers only slightly better performance than previous 802.11g.
 +
 +**Root cause:** 40MHz in 2.4GHz bands is often deactivated because of interference with other channels. There are only 3 20MHz channels without overlapping available in the 2.4.GHz band.
 + 
 +
 +**Solution:​** For a complete table see [[wp>​IEEE_802.11n-2009]]
 +
 +{{tag>​faq wireless wireless_throughput}}
  
playground/faq/i_am_not_reaching_theoretical_wireless_throughput.txt · Last modified: 2018/07/08 18:26 by tmomas