A/324 Candidate Standard RevisionApproved: 10 April 2024

This document is a revision of A/324, “Scheduler / Studio to Transmitter Link.” A/324 specifies the protocol on the Studio-to-Transmitter Link (STL) from studio side infrastructure to a Single Frequency Network (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. A/324 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.

This document is a Candidate Standard and may be updated from time to time by the originating specialist group, TG3/S32. The Candidate Standard period extends to 31 December 2025. The CS period may be shortened or extended by TG3.

Download “ATSC Candidate Standard: Revision of A/324:2024-04, Scheduler / Studio to Transmitter Link”, approved 10 April 2024. Accompanying schema is also available.

A redline showing changes relative to the current published version can be downloaded from this link: A/324 CS redline.