The products of our company mainly include digital tv conditional access system ( cas ) , subscriber management system ( sms ) , electronic program guide ( epg ) , vido optional display ( vod ) , stb , middleware , security broadcast monitoring facilities , data broadcast system , and data broadcast receiving card , etc 公司现阶段的产品主要包括数字电视有条件接收系统（ cas ） 、用户管理系统（ sms ） 、电子节目指南（ epg ） 、视频点播( vod ) 、机顶盒、中间件、安全播出监测设备、数据广播系统和接收卡等。
This thesis gives them a brief introduction and comparison first and then presents a solution for data broadcasting technology . lastly , we introduce the implementation of ip - catv and catv - ip gateway , which are key part of data broadcasting system , using the state - of - the - art technology - embedded fpga . the paper is organized as follow : chapter 1 gives a brief survey on broadband access techniques , hfc / catv network , protocols and standards for data transmission technology over hfc network and overview of embedded technologies we used 本文介绍dvb davic数据广播系统的原理，然后给出了一个数据广播系统的解决方案，并介绍了采用sopc技术实现其核心设备ip - catv及catv - ip网关的方案，全文安排如下：第一章介绍了宽带接入技术、 hfc catv网络及其数据传输标准以及嵌入式系统(我们系统方案使用) ，然后引出了本文的主要工作。
Data broadcast is a new field of information service in recent years , it is a new dissemination tool and integrate the internet and broadcast television networks . its source can be from every web site , its channel is digital television , and it push all the content of the web site to customer ’ s computer . it has both the advantages of the two media above , just as has adequate signal source and can spread abroad 数据广播是近年来所兴起的信息服务的新领域,它整合了互联网和广播电视网,它可以取所有网站作信源,取数字电视做信道,把网站内容整体推送到家。它继承了前两种媒体的长处(信源丰富、传播广阔) ,又避免了各自的短处(传播信道拥挤、不能保存随时查看) ,是一种全新的文化工具。
In the paper , it is mainly discussed that how the multi - agent technology is being introduced into the information system consisting of data broadcasting and ip network , and how a reliable information platform will be built , which can provide various kinds of information service , and which can transmit information cross - net in a convenient and efficient manner and can thus guarantee reliable user services , based on the characteristics of the multi - agent technology 本文主要研究在数字广播与ip网络组成的信息服务系统中引入多智能体技术，利用多智能体技术的特点建立一种可提供多种信息服务、跨越多种网络、方便高效的信息传输、具有可靠的用户服务质量的信息平台。论文的主要研究内容及特点如下： 1
