Cable Digital Tv Data Broadcasting And To Authorize The Management System Applied Research

The text, is based upon the Digital Television(DVB-C) head end front of Zhangqiu Radio&Television bureau where the author is serving on. Introduces mostly the data broadcasting based on CATV DVB-C and Addressable Digital Television Entitlement Manage System. These two systems follow the standard frame-saw of DVB-C and MPEG-2 in the mass. But they are different to the data broadcast based on the IE explore applying in the market currently and the really Condition Access System. They have the virtue that the hardware of the Set Top Box has little demand, displaying sooner, and the cost of the head end front is lower.Data Broadcasting system, is a system of exchanging, can use uniform data stream sending to consumer access equipments (Set Top Box). Access equipments establish channel connection of data broadcasting and transfer layer, using expert data broadcasting application layer protocol. They change passively access to actively parse, displaying different data information synchronously for user.The kernel of Addressable Digital Television Entitlement Manage System is the method of entitling management. It transfer the information after encrypted and modified, just via modifying correlative information using to describe program, such as SI/PSI information, Packet flag information of Basic Stream, etc. At the same time, it control user incepting TV signal using classified entitling information, namely the consumer can incept digital television program of corresponding level after they hold Set Top Boxes having classified entitling information.First, the article introduces the collective knowledge of DVB-C...