CONTENTS

Annex 1 - Ancillary data signal format    
 1     General description of the ancillary data signal format        
 2     8-bit considerations         
 3     Ancillary data packet format        
        3.1     Ancillary data packet types
        3.2     Ancillary data flag (ADF)   
        3.3     Data identification (DID) word       
        3.4     Secondary data identification (SDID) word (type 2 data only)        
        3.5     Data block number (DBN) (type 1 data only)         
        3.6     Data count (DC)    
        3.7     User data words (UDW)   
        3.8     Checksum (CS) word        
 4 Protocol for the use of ancillary data space           
Appendix 1 to Annex 1 - Eight- and ten-bit considerations    
 1     Introduction      
 2     Eight-bit compatibility      
        2.1     Data identification  
        2.2     Data count 
        2.3     User Data Words  
        2.4     Checksum 
Appendix 2 to Annex 1 - Internationally registered ancillary data identification    
Appendix 3 to Annex 1 - A protocol for the use of ancillary data space    
 1     General      
 2     Inclusion of non-conforming ancillary data packets
 3     Protocol for the insertion of an ancillary data packet         
        3.1     Determination of space available for insertion of ancillary data packet          
        3.2     Insertion of an ancillary data packet
 4     Protocol for the deletion of an ancillary data packet          
Appendix 4 to Annex 1 - Assigned ancillary ID codes for ancillary packets with payload formats defined in ITU-R Recommendations    
Appendix 5 to Annex 1 - Assigned ancillary ID codes for ancillary packets with payload formats defined as part of the DID/SDID registration process