A/323, “Dedicated Return Channel for ATSC 3.0”Approved: 17 July 2025

This standard specifies the physical layer and the Medium Access Control (MAC) layer for the ATSC 3.0 Dedicated Return Channel (DRC). The DRC physical layer specifies the uplink framing, baseband signal generation, random access, and downlink synchronization scheme. The DRC MAC layer specifies the MAC procedures, MAC PDU formats, and signaling schemes between the ATSC 3.0 downlink and DRC.

Download current version: A/323:2025-07, “Dedicated Return Channel for ATSC 3.0”, 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/323:2018, “Dedicated Return Channel for ATSC 3.0”, approved 7 December 2018, and accompanying schema. This version of the Standard is normatively referenced in A/300:2019, A/300:2020, and A/300:2021.

Download A/323:2022-03, “Dedicated Return Channel for ATSC 3.0”, 31 March 2022, and accompanying schema. This version of the Standard is normatively referenced in A/300:2022-04.

Download A/323:2023-03, “Dedicated Return Channel for ATSC 3.0”, 28 March 2023, and accompanying schema. This version of the Standard is normatively referenced in A/300:2023-03.

Download A/323:2024-04, “Dedicated Return Channel for ATSC 3.0”, 3 April 2024, and accompanying schema. This version of the Standard is normatively referenced in A/300:2024-04.