DIN EN 300347-1:2000 数字式本地交换的V接口.用于支持接入网络的V5.1接口.第1部分:V5.2接口规范
V interfaces at the digital Local Exchange (LE) - V5.1 interface for the support of Access Network (AN) - Part 1: V5.2 interface specifictation (Endorsement of the English version EN 300347-1 V 2.2.2 (1999-12) as German standard)