For further reading on why you need termination http://en.wikipedia.org/wiki/Time_domain_reflectometer 
'If the conductor is of a uniform impedance and properly terminated, the entire transmitted pulse will be absorbed in the far-end termination and no signal will be reflected.'

Imagine what happens at a mid-point (or thereabouts) of a long, high speed communications bus - if there were a reflection of your communications signal.

solarwind wrote:
> I don't understand what you mean by "terminate" the two ends. I tried
> to google for it, but searching for phrases involving "CAN" are
> difficult.


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