Multi-element metallic cables used in analogue and digital communication and control -- Part 3-1: Sectional specification for unscreened cables characterised up to 100 MHz - Horizontal and building backbone cables
模拟和数字通信及控制用多元金属电缆第3-1部分:100MHz及以下无屏蔽电缆分规范水平和建筑主干电缆