Business Telecommunications (BT); Transmission Characteristics at 2-Wire Analogue Interfaces of a Digital Private Automatic Branch Exchange (PABX)
国外标准现行
标准号:ETSI I-ETS 300 004-1991
标准名称: 商务通信(BT).数字专用自动支路交换(PABX)的两线模拟接口的传输特性
英文名称:Business Telecommunications (BT); Transmission Characteristics at 2-Wire Analogue Interfaces of a Digital Private Automatic Branch Exchange (PABX)