Hello,
A proprietary spec that I am reading says that random jitter is contributed by Tx, Rx and the Cable.
The spec says that the cable contributes RJ because of the fact that the data sent through it is scrambled.
According to my understanding cable should only be providing DJ due to ISI or noise pick-up.
If the data sent through it is scrambled, the edge movement due to ISI might be random but it is still bounded so should be added and not-squared and added as a random source.
Comments? Am I missing something?

--K