The Implementation Of DVB Common Interface Protocol Base On Nucleus

A set of standards has been designed to be used in digital video broadcasting. These standards include source coding, channel coding, service information and decoder interfaces. In addition, a conditional access system is used when there is a need to control access to a broadcast service. It has been decided that the conditional access system need not be standardized, although a common scrambling algorithm is provided. It remains for broadcasters to access decoders with different conditional access systems and to ensure that they have choice of supply of such systems. There are two solutions.A solution is simulcrypt, which is use the common scrambling algorithm and execute solutions for access based on commercial agreements between operators. This solution can operate with single CA systems embedded in decoders.A second solution is multicrypt, which is based on a standardized interface between a module and a host where CA and more generally defined proprietary functions may be implemented in the module. This solution also allows broadcasters to use modules containing solutions from different suppliers in the same broadcast system, thus increasing their choice and anti-piracy options. The decoder, referred to in this thesis as the host, includes those functions that are necessary to receive MPEG-2 video, audio and data in the clear.This design adopt multicrypt and DVB-CI protocol to implement CAS separated.Two logical interfaces, to be included on the same physical interface, bashed on PCMCIA specification. The first interface is the MPEG-2 Transport Stream interface. If services have been selected by the host, then the packets carrying those services will be returned descrambled. The command interface, carries commands for communication between the host and the module is more complex. The protocols on both interface are defined in several layers in order to expand and implement. Five layers are defined for command interface, include physical layer,link layer,transport layer,session layer and application layer. This thesis describe the implementation of DVB-CI protocol which is based of CT216 chip and Nucleus OS, and also analyze elements of conditional access and the expectation for DVB-CI technique.