A/324, “Scheduler / Studio to Transmitter Link”Approved: 17 July 2025

This standard 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. 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.

Download current version: A/324:2025-07, “Scheduler / Studio to Transmitter Link”, 17 July 2025. This version of the Standard is normatively referenced in A/300:2025-07.

Previous Versions

There are multiple versions of this document. Please be sure to download the desired version. For amendments, the text includes a list of changes, the rationale for the changes, and compatibility considerations.

Download A/324:2018, “Scheduler / Studio to Transmitter Link”, approved 5 January 2018. This version of the Standard is normatively referenced in A/300:2019 and A/300:2020.

Download A/324:2021, “Scheduler / Studio to Transmitter Link”, and accompanying schema, approved 24 March 2021. This version ofd the Standard is normatively referenced in A/300:2021.

Download A/324:2021 Amendment No. 1, DSMapping Clarification”, and accompanying schema, approved 4 October 2021.

Download A/324:2021, “Scheduler / Studio to Transmitter Link, with Amendment No. 1”, and accompanying schema. This document has Amendment No. 1 integrated into the standard.

Download A/324:2022-03, “Scheduler / Studio to Transmitter Link”, and accompanying schema, 31 March 2022. This version of the Standard is normatively referenced in A/300:2022-04.

Download A/324:2022-03 Amendment No. 1, MIMO Configuration in Broadcast Gateway”, approved 13 June 2022.

Download A/324:2022-06, “Scheduler / Studio to Transmitter Link”, 13 June 2022, and accompanying schema.

Download A/324:2023-03, “Scheduler / Studio to Transmitter Link”, 28 March 2023, and accompanying schema. This version of the Standard is normatively referenced in A/300:2023-03.

Download A/324:2024-04, “Scheduler / Studio to Transmitter Link”, 3 April 2024, and accompanying schema. This version of the Standard is normatively referenced in A/300:2024-04.

Download A/324:2024-04 Amendment No. 1, “MIMO, LDM, CB Joint Operation”, approved 8 January 2025.

Download A/324:2025-01, “Scheduler / Studio to Transmitter Link”, 8 January 2025, and accompanying schema.

Download A/324:2025-01 Corrigendum No. 1, approved 11 April 2025.

Download A/324:2025-04, “Scheduler / Studio to Transmitter Link”, 11 April 2025, and accompanying schema.