Question

Is all binary signaling digital give resistance to error?

Answer 1

Digital signals (usually binary coded) can include extra information that can be used for error detection or even correction. This allows recovery of the original signal, either by requesting retransmission or by directly correcting the error. 

analog signals can't include any extra information needed for this purpose. it is impossible to distinguish an error from the original data.

cited:http://www.answers.com/Q/Which_has_greater_resistance_to_transmission_errors_Binary_signaling_or_Ana...