"Cheap" traffic options?

> I'm going to assume that they also have a "back off" timer that slows those
> transmissions or that's one seriously screwed up data system design.

Good instinct. It's a combination of CSMA/CD and whisper/SHOUT.
 
CSMA/CD has proven to be incredibly robust in so many applications it's almost amazing really. One of the true examples of "elegant" electrical and software engineering design.
 
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