Look into the systematic behaviour of insertion loss deviation in data grade channels, its partial measurement and characterisation as a specification requirement

The author states the precise definitions of insertion loss for transmission lines and the importance of the insertion loss deviation (ILD) is elucidated. ILD represents a noise, arriving simultaneously to the signal at the receiver (ghosts). There are multiple phase or time delays between the signal and the added reflection components of the ILD. Within ISO/IEC prime importance has been so far attached only to the channel performance based upon the attenuation to near-end cross-talk ratio of links and channels. But this is not the only limiting characteristic imposing severe restrictions on the link or channel performance, especially not for the operating frequency ranges considered for class E and F links and channels with inherently occurring impedance mismatches. In fact, the ILD noise is equally limiting, and thus, comparable to the cross-talk noise as an impacting factor for links and channels with respect to their signal-to-noise ratio, and it will have to be specified accordingly.