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  ITU-T A.5 justification information for referenced document ANSI/SCTE 194-2 2013 in draft H.721 (V2)
1. Clear description of the referenced document:
Name: ANSI/SCTE 194-2 2013
Title: DTS-HD AUDIO SYSTEM – Part 2: Constraints for Carriage over MPEG-2 Transport
2. Status of approval:
Published as an AMERICAN NATIONAL STANDARD.
3. Justification for the specific reference:
H.721 version2 references DTS-HD AUDIO as one of audio codec for IPTV services. ANSI/SCTE 194-2 is used as an alternative ways to deliver DTS-HD Audio data.
4. Current information, if any, about IPR issues:
Patent holders who believe that they hold patents which are essential to the implementation of this document have been requested to provide information about those patents and any related licensing terms and conditions. Any such declarations made before or after publication of this document are available on the SCTE web site at http://www.scte.org.
5. Other useful information describing the "Quality" of the document:
It is published as an AMERICAN NATIONAL STANDARD.
6. The degree of stability or maturity of the document:
It is published as an AMERICAN NATIONAL STANDARD.
7. Relationship with other existing or emerging documents:
References within the referenced draft are listed under item (8).
8. Any explicit references within that referenced document should also be listed:
[1] ETSI TS 102 114 v 1.4.1, “DTS Coherent Acoustics; Core and Extensions with Additional Profiles”/
[2] ISO/IEC 13818-1:2007, "Information Technology - Generic coding of moving pictures and associated audio information: Systems"./
[3] ISO/IEC 639-2:1998, "Codes for the representation of names of languages - Part 2: Alpha-3 code"/
[4] SCTE 194-1 2013, “DTS-HD Audio System – Part 1 : Coding Constraints for Cable Television”/
[5] SCTE 54 : 2009, “Digital Video Service Multiplex and Transport System Standard for Cable Television”
9. Qualification of SCTE:
SCTE is recognized under the provisions of ITU-T Recommendation A.5. Qualifying information is on file with TSB.
10. Other (for any supplementary information):
The following documents may provide valuable information to the reader but are not required when complying with this standard. [1] DTS Document #9302J19200: "DTS-HD PBR API Library Interface", DTS Inc., available at www.dts.com.
Note: This form is based on Recommendation ITU-T A.5