International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 50221:1997
Title Common interface specification for conditional access and other digital video broadcasting decoder applications
Project Number 6794
Abstract/Scope 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. A solution is to use the common scrambling algorithm and to execute solutions for access based on commercial agreements between opera-tors. This solution can operate with single CA systems embedded in decoders. A second solution 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 con-tainting 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


Current Stage code 6060
Current Stage code date 1997-02-26
Current Stage code deadline 1997-10-01
Deadline date for vote  


Order Voucher BC-T-304B2


IEC Technical Body IEC/TC 100
Reference Document  
ICS 33.160.40 - Video systems
Keywords Video; Decoder applications; Digital video broadcasting
Note Corrigendum to EN issued February 2000 * Initially handled by TC 206 (disbanded) * D141/C101: Transferred to new TC 100X
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 1997-02-26 1997-10-01  
5099 1997-02-15 1997-03-15  
5061 1996-12-20 1997-02-14  
5020 1996-06-04 1996-11-30  
3090 1996-05-03 1996-05-31  
3020 1996-03-21 1996-09-21  
5092 1996-03-05 1996-09-15  
5062 1996-02-13 1996-03-05  
5020 1995-08-10 1996-02-01  
3090 1995-07-04 1996-01-04  
2020 1995-04-26 1995-05-31  

Implementation Dates

date of Ratification (DOR) (1) 1997-02-15
date of Availability (DAV) (2) 1997-02-26
date of Announcement (DOA) (3) 1997-04-01
date of Publication (DOP) (4) 1997-10-01
date of Withdrawal (DOW) (5) 1997-10-01


Superseded by  
Normative reference (6)  

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.