介绍双向HF C接入网的用户家庭终端系统的基本功能和各种类型业务，主要介绍数字stb在HF C接入网中所起到的重要作用。
Introduced the basic functions and some kinds of business user house terminal system over HFC net. Mainly introduced an important function of digital STB in HFC net.
基于TETRA数字集群移动通信系统开发的TETRA终端，通过数据业务可以发送和接收状态消息和短数据业务消息，利用短数据业务完成终端导航定位功能。
Terminal based on TETRA digital trunking mobile communication system could send and receive status and short data service message, and achieve navigation and location through short data service.
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