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Wireless transfer uses radio signals and is always slower than wired transfer.
When you use cable, the application (say a router) has the entire cable to itself - other applications (say a stereo) will use a different cable, and the signals in different cables do not interfere with each other.
When sending through air, the application must share the air space with radio, television, cell phones, other wireless routers (where I live there is about a dozen WiFi networks within range) and electronic noise from fridges, microwave ovens and whatnot.
The net effect is that a wireless transmission can only use a tiny slice of the radio spectrum to avoid collision with everything else that is also using radio waves.
A cable transmission, on the other hand, can use almost the entire spectrum without worrying about collision with signals in other cables.
So cable transmissions will always have an edge in bandwidth: Whatever scheme is invented to stuff more data into less wireless spectrum could equally well be used for cable transmissions, and cable has more available spectrum to begin with.
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∙ 14y ago
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