IEC 61156-6 pdf download.Multicore and symmetrical pair/quad cables for digital communications 1 General 1.1 Scope This sectional specification relates to IEC 61156-1: Multicore and symmetrical pair/quad cables for digital communications – Part 1: Generic specification. The cables described herein are specifically intended to construct patch, equipment, and work area cords for class D, E and F channels, as defined in...