数字通信用多核及对称双/四芯电缆 - 第12部分：具有高达600MHz（1.25GHz）传输特性的单对对称电缆

[中文适用范围]： IEC 61156-12:2025 RLV 包含官方 IEC 国际标准及其红线版本。红线版本仅提供英文版，可让您快速轻松地比较官方 IEC 标准与其先前版本之间的所有更改。IEC 61156-12:2025 规定了用于 ISO/IEC 11801-1:2017 和 ISO/IEC 11801:2017/AMD1 中描述的办公室、家庭和工业应用的单平衡对布线的电缆。现有应用的一个例子是 1000BASE-T1，请参阅 ISO/IEC TR 11801 9906。这些电缆的传输特性规定在高达 1.25 GHz 的频率和 20°C 的温度下使用。 T1-B 型电缆的频率范围为 0.1 MHz 至 600 MHz，T1 C 型电缆的频率范围为 0.1 MHz 至 1.25 GHz。根据 MICE 环境和安装条件，可以使用非屏蔽或屏蔽电缆。空白详细规范见附件 A。第二版取消并取代了 2021 年发布的第一版。此版本为技术修订版。与上一版相比，此版本包含以下重大技术变更：a) 增加了支持高达 1.25 GHz 的 T1-C 通用单对布线的电缆类型；b) 引入低频耦合衰减作为描述 30 MHz 以下频率屏蔽效率的重要参数。 [外文原描述]： IEC 61156-12:2025 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 61156-12:2025 specifies cables intended to be used for single balanced pair cabling for office, home and industrial application described in ISO/IEC 11801-1:2017 and ISO/IEC 11801:2017/AMD1 . An example of existing application is 1000BASE-T1, see ISO/IEC TR 11801 9906. The transmission characteristics of these cables are specified up to a frequency of 1,25 GHz and at a temperature of 20 °C. The T1-B type cable is specified from 0,1 MHz to 600 MHz, the T1 C type cable from 0,1 MHz to 1,25 GHz. Depending on the MICE environment and the installation conditions, either unscreened or screened cables can be used. A blank detail specification can be found in Annex A. This second edition cancels and replaces the first edition published in 2021. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) additional cable type in support of T1-C generic single pair cabling up to 1,25 GHz; b) introduction of low frequency coupling attenuation as an integral parameter describing screening efficiency at frequencies below 30 MHz.