[Tinyos-help] about interface RadioBackoff: What is CCA?

[sergio mena doce]

First, I would like to be grateful for your response about "How to use interface RadioBackoff", David.

In the interface radioBackoff there are the requestCca event and the setCca command:

async event void requestCca(message_t *msg);
async command void setCca(bool ccaOn);

 so, what is Cca? Is necessary enable CCA to modify Backoff times?

Thanks again.
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