Conditional access ( ca ) is a technology used to control access to digital television ( dtv ) services to authorized users by encrypting the transmitted programming . an emm provides general information about the subscriber and the status of the subscription . the emm is sent with the ecm 数字电视用户管理系统通过对用户订购信息的记录与处理，形成用户数据库，并经由与条件接收系统的接口，向条件接收系统发送用户授权管理信息的基本数据，条件接收系统据此实现对用户收看数字电视节目的控制。
This thesis present the solution to the interface problem between network management system ( nms ) and subscriber administration system ( sam ) based on corba technique . with the market ' s growth , there are more end more urgent requests on the scalability , capacity , interoperability and reusability for the server system , especially on the interface between the network management system ( nms ) and subscriber administration system ( sam ) 本论文针对utstarcom的电信网管系统( nms )和用户管理系统( sam )在系统升级和扩容中遇到的一些接口问题，进行了分析和探讨，最终采用了corba这种面向对象的分布技术作为网管系统( nms )和用户管理系统( sam )间的接口方案。
The ldap directory service is a cross platform service , based on the ldap unified user management system , provided the distribution access and the management different application system information resources ability for the urp platform . it simplifies the system resources maintenance and the management , realizes the seamless connection which between the application system access . meanwhile , the modular system structure guarantees the characteristic of independence and loose coupling system level Ldap目录服务是跨平台的服务,基于ldap的统一用户管理系统为urp平台提供了分布式访问和管理不同应用系统的信息资源的能力,简化对系统资源的维护与管理,实现了应用系统之间访问的无缝连接,同时模块化的系统结构保证了系统的层次独立、松散耦合的特性。
The ca system is the main establishment of the managing digital tv broadcasting . centralized management means that using mux to manage the providing program and services in the head - end of the digital tv broadcasting and multimedia ; using subscriber management system to realize the registering , statisting , managing according to the command of users . set - top boxes ( stbs ) can realize the functions of multimedia services at the side of consumers 集约式管理是指在广电多媒体宽带分配网络的头端( head - end )用复用器对提供的节目或称为服务进行管理，用用户管理系统( subscribermanagementsystem ，简称sms )对每个用户的要求实现记录、统计和管理，使整个系统提供的服务精确到每个终端，在用户端用机顶盒来实现系统提供的各种多媒体服务。
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。
The paper mainly introduces how to implement a subscribe management system ( sms ) and an interface between subscribe management system and conditional access system ( ca system ) . to capture the necessary functions for sms , the running environment of sms is introduced . background and architecture of digital tv system are explained briefly at first 本论文主要介绍对数字电视系统中的用户管理系统( subscribemanagementsystem ，缩写为sms )以及它和条件接收系统( conditionalaccesssystem ，缩写为ca )之间接口的设计与实现。
