Applicable to the reverse paths for a.m. PAL colour TV signals conforming to CCIR system I with associated sound signals, and to signals delivered to the head end from a designated input point for distribution downstream, or for extension to a point outside the system.Cross References:BS 4727:Part 3:Group 07Partially replaced by BS 6513:Part 6:1987.Incorporates the following:AMD 5794 published 23 December 1987