IEEE 802.1AS:2025

Revision Standard - Active - Draft.
This is a Maintenance roll-up of IEEE Std 802.1AS™-2020 with the corrigendum IEEE Std 802.1AS-2020/Cor1 and amendments IEEE Std 802.1ASdr, IEEE Std 802.1ASdm, and IEEE Std 802.1ASdn.

This standard specifies protocols, procedures, and managed objects to meet the synchronization requirements for time-sensitive applications, such as audio, video, and time-sensitive control, across networks, for example, IEEE 802 and similar media. This includes the maintenance of synchronized time during normal operation and following addition, removal, or failure of network components and network reconfiguration. It specifies the use of IEEE Std 1588™ where applicable in the context of IEEE Std 802.1Q(TM). Synchronization to an externally provided timing signal [e.g., a recognized timing standard such as Coordinated Universal Time (UTC) or International Atomic Time (TAI)] is not part of this standard but is not precluded.
This standard enables systems to meet the respective jitter, wander, and time-synchronization requirements for time-sensitive applications, including those that involve multiple streams delivered to multiple end stations. To facilitate the widespread use of packet networks for these applications, synchronization information is one of the components needed at each network element where time-sensitive application data are mapped or demapped or a time-sensitive function is performed. This standard leverages the work of the IEEE 1588 Working Group by developing the additional specifications needed to address these requirements.