Abstract: The PCMCIA interface technology aparting conditional asscess card from set top box is discussed in this paper. The solution is based on a common interface standardised in Digital Video Broadcasting between a module and a host ,where conditional access system and more generally defined proprietary functions may be implemented in the module.The unified hardware and the software standard separately defineds in different level to encapsulate the different characteristics between conditional asscess. The solution allows broadcasters to use modules containing solutions from different suppliers in the same broadcast system.