Attachements to the Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN (Endorsement of the English version EN 300001 V 1.5.1 (1998-10) as German Standard)
公共交换电话网(PSTN)的附件.连接到PSTN中模拟用户接口的设备的一般技术要求(作为德国标准认可英文版EN 300001 V 1.5.1(1998-10)