20Mhz 802.11n = 72 Mbps Link speed (often rounded up to 75 for marketing)
40Mhz 802.11n = 144 Mbps Link speed (often rounded up to 150)
20Mhz 802.11n with 2x2 MIMO = 144 Mbps
40Mhz 802.11n with 2x2 MIMO = 288Mbps (rounded up to 300 for marketing)
20Mhz 802.11n with 4x4 MIMO = 288 Mbps
40Mhz 802.11n with 4x4 MIMO = 576 Mbps (Marketed as 600 Mbps 802.11n)
This is the math. The theoretical maximum with 802.11n is 576 Mbps. But this is raw throughput. There’s a 25% reduction for higher layer data transport due to MAC and IP overhead. Hence you’ll get 55Mbps (for link speed 72 Mbps), 108 Mbps (for link speed 150 Mbps), 216 Mbps (for link speed 300 Mbps), and 432 Mbps (for link speed 600 Mbps) even with the best radio conditions.
@Tejas01 well if they do that there business will be gravely affected, as how can they then fool customers by disabling already hardware supported features to cut costs.
So , your device doesn't support 40mhz channel width . Thats why you are getting 72mbps link speed. Manufacturers usually do this to extend battery life , cost cutting etc.
My phone sticks at 42-45 Mbps but there is one workaround for Laptop which worked for me
I disabled Windows defender firewall and re-enabled it and speeds went from 40 to 100 Mbps.
Next day it was again 40 Mbps, then i restarted router and it worked again 100+ Mbps
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