Home / Standards / GB/T 18015.21-2025 GB/T 18015.21-2025 Active Multicore and symmetrical pair/quad cables for digital communications—Part 21: Horizontal floor wiring—Blank detail specification 数字通信用对绞或星绞多芯对称电缆 第21部分:水平层布线电缆 空白详细规范 Standard Type GBT ICS 29.060.20 CCS K13 Status 现行 Issue Date 2025-10-05 Implementation 2026-05-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A