ATTACHMENTS TO PUBLIC SWITCHED TELEPHONE NETWORK (PSTN). GENERAL TECHNICAL REQUIREMENTS FOR EQUIPMENT CONNECTED TO AND ANALOGUE SUBSCRIBER INTERFACE IN THE PSTN. PART 2: ATTACHMENT REQUIREMENTS TO THE SPANISH PSTN.
公共交换电话网(PSTN)的附件 PSTN中连接设备和模拟用户接口的一般技术要求 第2部分:西班牙PSTN的连接要求