Soa, Cas-based Front-end Research And Realization

The digitalization of TV is another great technology innovation in the history of TV development. Digital TV is a technology system involving standards, equipments and program sources, etc. These parts support and adapt to each other, it will affect and promote the development of related industries. Digital TV brings a voluntary manner to the customs, development chances to the receiving device dealers, and new business and opportunity to the CATV and Satellite TV dealers. All of the above depend on one precondition, a flexible CAS with high efficiency and power force.In this article, the author make the research of the standards, the basic principles, the mechanism of reusability, the structure of CAS, the common scrambling arithmetic. After that, the author research the architecture of SOA, the related technology about the implementation of SOA, the lifecycle of SOA, the model of logical architecture of SOA and WSIF. Then a CAS Head-end based on SOA is implemented. Presented the arithmetic of service-pipeline scrambling ,and implemented it .By useing this method ,the bottle-neck of speed caused by general scrambling system which is implemented as a software is overcome. As for the high flexibility, reliability and the implementation of parallel scrambling service module, the CAS Head-end can adapt complex environment, it is a flexible CAS Head-end with high efficiency.Indicated from the software prototype test, the entire CAS Head-end, which including the highly effective service-pipeline scrambling, can the work normally. And can word stably when band width is 4M.The users without unscrambling authorition can receive only scrambling vidio stream, which could not get the right programe. Althought it is just a prototype test and without any long term, real time,big scale and extremly tests. But its agility,business celerity,high speed scrambling and scrambling stability has already exceed many other present products.