CEPT NET 3 PART 1 E-1988 使用ISDN基本接入.第1部分:(T/TE 04-08E)第1和2层方面连接到综合业务数据网(ISDN)的数据终端设备批准要求
Approval Requirements for Terminal Equipment to Connect to Integrated Services Digital Network (ISDN) Using ISDN Basic Access Part 1: (T/TE 04-08E) Layers 1 and 2 Aspects