Essential requirements for terminal equipment intended for connection to 2-wire analogue speechband leased lines of the public telecommunications network
国外标准现行
标准号:PD 7020-1996
标准名称: 公共通信网络双线模拟语音频带租赁线连接终端设备的基本要求
英文名称:Essential requirements for terminal equipment intended for connection to 2-wire analogue speechband leased lines of the public telecommunications network