数字通信用多芯对称对绞/四芯电缆.第7部分:传输特性达1200MHz的对称对绞电缆.数字和模拟通信电缆分规范

[中文适用范围]： 本部分IEC 61156规定了可用于各种通信系统以及模拟系统（如视频）的电缆，这些系统可能存在或正在开发中，并且可以同时使用多达四对电缆。从这个意义上说，本分规范提供了系统开发人员评估新系统以及增强现有系统所需的电缆特性。 它涵盖了具有四个单独屏蔽（STPS/FTP）对的电缆。电缆可以在电缆芯上提供公共屏蔽。 传输特性在频率高达1200 MHz和温度为20°C时指定。 本分规范涵盖的电缆旨在用于通信系统中通常遇到的电压和电流，并支持直流低压远程供电应用。这些电缆不适用于与低阻抗源（例如公共事业电源的电力供应）一起使用。 [外文原描述]： IEC 61156-7:2023 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 61156-7:2023 specifies cables that can be used for various communication systems as well as for analogue systems, such as video, that exist or are under development and which may use as many as four pairs simultaneously. In this sense, this sectional specification provides the cable characteristics required by system developers to evaluate new systems as well as to enhance present systems. It covers a cable having four individually screened (S/FTP) pairs. The cable can be provided with a common screen over the cable core. This second edition cancels and replaces the first edition published in 2003 and Amendment 1:2012. This edition includes the following significant technical changes with respect to the previous edition: a. align clauses with IEC 61156-1:2023; b. remove the clause related to screening attenuation as it is no longer a test to be performed (replaced by coupling attenuation); c. replace the IEC 62153-4-2 method (injection clamp) with IEC 61156-4-5 (absorbing clamp) for coupling attenuation measurement to be consistent with all other parts of the IEC 61156 series; d. include IEC 62153-4-9 test method (triaxial) for coupling attenuation measurement to be consistent with all other parts of the IEC 61156 series; e. incorporate the blank detail specification.