This article introduces some new equipment of DTV head-end, such as statistical multiplexer, statistical re-multiplexer, QAM modulator with multiplex and scramble function, multi-protocol DS-3 to ASI bidirectional adapter. It also describes how to construct head-end using these equipment. 介绍一些新型数字电视前端设备,例如,统计复用器,统计再复用器,带复用加扰功能的QAM调制器以及多协议的DS-3到ASI双向适配器,并且讲述如何利用这些设备构建前端。