NEN-EN 50221:1995 Ontw. en

Interface-specificatie voor voorwaardelijke toegang en andere toepassingen van digitale video-omroepdecodeerders

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Status Ingetrokken
Aantal pagina's 76
Commissie Geluid, beeld en multimedia-apparaten en -systemen
Gepubliceerd op 01-08-1995
Taal Engels
A set of standards has been designed to be used in digital video boradcasting. 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 standardised, 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. A solution is to use the common scrambling algorithm and to execute solutions for access based on commercial agreements between operators. This solution can operate with single A systems embedded in decoders. A second solution is based on a standardised 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 scope of this document is to describe this common interface. The decoder, referred to in this specification as the host, includes those functions that are necessary to receive MPEG-2 video, audio and data in the clear, This specification defines the interface between the host and the scrambling and CA applications, which will operate on an external module. Two logical interfaces, to be included on the same physical interface, are defined. The first interface is the MPEG-2 Transport Stream. The link and physical layers are defined in this specification and the higher layers are defined in the MPEG-2 specifications. The second interface, the command interface, carries commands between the host and the module. Six layers are defined for this interface.


ICS-code 33.160.40
Nederlandse titel Interface-specificatie voor voorwaardelijke toegang en andere toepassingen van digitale video-omroepdecodeerders
Engelse titel Common interface specification for conditional access and other digital video broadcasting decoder applications
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