ETSI ETR 152-1996 传输和复用(TM).本地金属线上的高比特率数字用户线路(HDSL)传输系统.2,048 kbit/s基本接入数字段的HDSL核心规范与应用(第3版)
Transmission and Multiplexing (TM); High Bit Rate Digital Subscriber Line (HDSL) Transmission System on Metallic Local Lines; HDSL Core Specification and Applications for 2 048 kbit/s Based Access Digital Sections (Third Edition)