This ITU-T Recommendation describes a methodology to qualify metallic cables for broadband
use, before and after their installation on access networks. The qualification process is based on
measurements of Transmission Rate (TR) carried out on the worst possible use condition of the
cables, i.e., when all pairs are transmitting at the same time.
This methodology is known as Spectral Emulation Method (SEM) and can be applied to qualify
modern broadband network and old telephone networks used to carry xDSL signals.