This section specifies the basic structure, main performance, inspection rules, test methods, and packaging requirements for horizontal twisted pair cables in symmetrical pair/star twisted cables for digital communication. The horizontal twisted pair cables (hereinafter referred to as cables) specified in this section are mainly applicable to the following two aspects: - they are applicable to the horizontal wiring defined in YD/T 926 "Building Communication Comprehensive Wiring System" (the wiring between the communication outgoing end in the work area and the distribution frame in the handover room)—— IEEE 802.3af/at Ethernet power supply system (Power over Ethernet) suitable for transmitting low voltage and low power. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 3953-2009 Round Copper Wire for Electrical Purposes (IEC 60028, NEQ) GB/T 4910-2009 Tinned Round Copper Wire GB/T 6995.2-2008 Identification and Marking Methods for Electric Wires and Cables Part 2: Standard Colors GB/T 17737.1-2013 Coaxial Communication Cables Part I: General Specification Definitions and Requirements (IEC61196-1:2005, IDT) GB/T 26572-2011 Limits for Restricted Substances in Electronic and Electrical Products YD/T 838.1-2016 Symmetrical Pair/Star Twisted Cables for Digital Communications Part 1: General (IEC61156-1:2009, NEQ) JB/T3135-2011 Silver Plated Soft Round Copper Wire 3 Terms and Definitions YD/T 838.1-2016 The terms and definitions defined in this document apply. 4 Product Classification and Naming 4.1 Product Classification Cables are divided into three structures based on their shielding types: unshielded, total shielded, and pair individually shielded
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