Originally Posted by Stuart C
It's worth noting that for digital cables the signal either gets through or doesn't.
It is true that digital signals are fundamentally more noise-immune than analog (by their nature), Nevertheless, it's not quite a simple as either it works or it doesn't in a digital system.
A bitstream can be subject to jitter and pulse-shaping problems.
Jitter may be generated at source (irrespective of cabling) affects the data recovery and can lead to clocking problems and therefore manisfest itself as click or pops in an audio system.
Pulse shaping problems can be due to signal degradation due to poor quality cable or shielding. These can result in increasing bit-error rate. These errors may, or may not be recoverable. Effects may be blocking, break-up or freezing in a video system.
Therefore, assuming that you do not see such errors, then the chances are your cable is good enough. Assuming that it is mechnically sound (i.e. not about to fall into pieces)!! So, perhaps, the original statement is a reasonable approximation in practice, after all!!!!
So any appropriately specified digital cable should be adequate for transmission of the digital signal.
I'll get me coat.