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Usually, the probability p for transmitting when a previously busy channel becomes free again is agreed upon by all nodes. p is chosen by the installer mostly depending on the total number of nodes in the network and expected transmission rates, but also on the desired aggressiveness. E.g. when the number of nodes is more on the high side but the mean ...


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More or less, yes. The application will simply pass it's data up the stack. It's up to the subsequent layers to break that message down into packets, by understand enough about the next layer to not make it impossible. (i.e. a TCP packet can be 64k, but the ethernet interface's MTU is 1500, so don't give it more than that.) Each layer will add whatever its ...


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