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Dual band wireless routers- share files across bands?

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A typical G channel can theoretically carry 54 mbps. An N channel can carry more.

But these (advertised) speeds have to be shared between all participants. If your neighbor is using the same channels that you have, then the routers will agree on a "time share" basis.

If your neighbor uses an adjacent channel to yours, then reciprocal radio interference may force a fall-back to "A" channels or degrade your connection to almost nothing.

Other radio interference may also lead to lower capacity.

Even if we forget about radio interference from the outside: If you can put half of your computers on one frequency band, and half on another, then there will be less nodes that will share the available communication link on each frequency = higher speed.