说明：  下一代网络（NGN）是可以在电信网、计算机网和有线电视网3种互联互通的网络上提供语音、数据、视频的新一代网络
(Next Generation Network (NGN) are in the telecommunications network, computer network and cable television network of the three kinds of interconnection networks to provide voice, data, video of the next-generation networks)