A Candidate Standard has received significant review within a Specialist Group. Advancement of a document to Candidate Standard is an explicit call to those outside of the related Specialist Group for implementation and technical feedback. This is the phase at which the Specialist Group is responsible for formally acquiring that experience or at least defining the expectations of implementation.
Documents are provided in the links below in the Acrobat (PDF) format. Schema files are provided in the ZIP format.
This standard specifies the protocol on the Studio-to-Transmitter Link (STL) from studio side infrastructure to an SFN of Transmitters. It defines delivery protocols for ALP Transport. The document also defines possible interfaces among the studio infrastructure, for example the interconnection of the ATSC 3.0 Link Layer Protocol (ALP) and a Broadcast Gateway. This document specifies certain constraints on the scheduling of content and signaling on the Physical Layer. The described scheduling process enables Preamble generation and emission time management. It specifies certain aspects of Transmitter behavior and certain parameters of Transmitter operation.
The Candidate Standard period ends on 31 March 2021.
Download Candidate Standard Revision of A/324:2018, “Scheduler / Studio to Transmitter Link”, 3 December 2020. A redline document is available showing changes relative to the current published version of A/324:2018.
This document describes the interactive content environment provided by an ATSC 3.0 receiver. This environment is comprised of a standard W3C User Agent with known characteristics, a WebSocket interface for obtaining information from the receiver and controlling various receiver functionality, and an HTTP interface for accessing files delivered over broadcast. This document also specifies the life cycle of the interactive content when delivered over broadband or broadcast or both.
The Candidate Standard period ends on 30 November 2021.
Download Candidate Standard Revision of A/344:2020, “ATSC 3.0 Interactive Content”, 18 December 2020. This ZIP file contains the A/344 CS, JSON Schemas, JSON examples and deprecated JSON schemas.
A change log is also available. This document describes changes to the A/344 Candidate Standard. These changes have been accepted by the TG3/S38 Specialist Group on Interactive Content but are pending full TG3 and ATSC membership approval. Readers are cautioned that these changes may be amended in the future but are encouraged to provide feedback and comments.
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