用于数字通信的多芯和对称双绞线/四线电缆 - 第5部分:传输特性高达1 000 MHz的对称双绞线/四线电缆 - 水平地板接线 - 剖面规格

[中文适用范围]： 本部分 IEC 61156 描述了主要用于水平楼层布线的电缆，如 ISO/IEC 11801（所有部分）所定义。它涵盖由单独屏蔽、公共屏蔽和未屏蔽的对或四线组组成的电缆设计。电缆的传输特性和频率范围（见表 1）在 20°C 下指定。这些电缆可用于使用多达四个线组同时进行通信的各种信道。从这个意义上讲，本文件提供了系统开发人员评估新系统所需的电缆特性。本文件涵盖的电缆旨在运行在通信系统中通常遇到的电压和电流下。虽然这些电缆不打算与低阻抗源（例如公用事业 mains 的电力供应）一起使用，但它们旨在支持低压远程供电应用，例如 IEEE 802.3af（以太网供电）或进一步开发，例如根据 IEEE 802.3at 或 IEEE 802.3bt。有关根据安装实践支持这些应用的能力的更多信息，请参阅 IEC 61156-1-4、IEC TR 61156-1-6 和 ISO/IEC TS 29125。 [外文原描述]： IEC 61156-5:2020 describes the cables intended primarily for horizontal floor wiring as defined in ISO/IEC 11801. It covers cable designs comprising individually screened, common screened and unscreened pairs or quads. The transmission characteristics and the frequency range of the cables are specified at 20 °C. The cables covered by this document are intended to operate with voltages and currents normally encountered in communication systems Those cables are intended to be used to support the delivery of low voltage remote powering applications such as IEEE 802.3af (Power over Ethernet) or further developments for example according to IEEE 802.3at or IEEE 802.3bt. This third edition cancels and replaces the second edition published in 2009 and Amendment 1:2012. This edition includes the following significant technical changes with respect to the previous edition - additional balance levels with respect to MICE implementation by certain cabling specifications; - reference to current standards and technical reports with respect to measurement techniques and remote powering.