Re: [Autoconf] aspects of multi-hop wireless communication

["Dearlove, Christopher (UK)" <[e-mail]>]

> There's noise in the wires as well and gets supressed by PHY and MAC.

PHY layers, especially in radio, are not magic noise suppressors.

I'm going to spell this one out once, then give up and suggest
any elementary text on radio.

If I put a loud noise source right next to C, it will mess up
C's reception. But A, who is much more distant from the noise,
won't care.

And before you suggest avoiding noise sources, let's just say
they range from things in the environment (inclusing man made
things) that are difficult to avoid, to people doing this
deliberately.

And note that different power levels, and different noise
environments are still not the only reasons for asymmetry. But
either one is sufficient to make it happen.

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