Summary

Supplement to the ITU-T K-series Recommendations provides criteria that enable the implementation of power cross protection for telecommunication cabling connected to equipment compliant with ITU‑T K.20, ITU‑T K.21 and ITU-T K.45.

This supplement aims to:

•            Provide current-time limitations to protect telecommunication cabling from fusing and wire insulation damage.

•            Explain the evolution of physical wiring simulators and their drawbacks.

•            Provide designers with the tools to extrapolate the supplement current-time limitations data to larger and smaller conductor sizes.