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AES67

AES67 is a technical standard developed by the Audio Engineering Society (AES) for high-performance streaming audio-over-IP interoperability, providing comprehensive recommendations to ensure compatibility across diverse professional audio networking systems.^[1] It specifies protocols for synchronization, media clock identification, network transport, encoding, streaming, session description, and connection management, supporting uncompressed PCM audio at sampling rates of 44.1 kHz or higher with 16-bit resolution and low latencies under 10 ms, making it suitable for live sound reinforcement and enterprise-scale networks.^[1] First published on September 11, 2013, the standard has undergone revisions, including addendums in 2014 and full updates in 2015, 2018, and 2023, to refine aspects such as MTU requirements, SDP examples, and sender keep-alive mechanisms.^[1]^[2] Operating as a Layer 3 protocol suite over IP networks, AES67 leverages established IETF and IEEE standards—including RTP for media transport, IEEE 1588-2019 Precision Time Protocol (PTP) for clock synchronization, SAP for session announcements, and SDP for stream descriptions—to enable routable, scalable audio distribution without proprietary extensions.^[2] This open interoperability framework allows seamless integration between competing audio-over-IP technologies, such as Dante, Ravenna, Livewire, and Q-LAN, by defining a common "AES67 mode" that devices can activate for cross-vendor compatibility.^[2] Unlike Layer 2 solutions like AVB/TSN, AES67's IP-based approach supports larger, routed networks while maintaining multicast and unicast transmission with IGMP for efficient traffic management, though it omits built-in error correction to prioritize low latency.^[2] Since its introduction, AES67 has gained widespread adoption in professional audio applications, including broadcast, installation, and touring sound systems, with support from major manufacturers like Audinate (Dante), ALC NetworX (Ravenna), and Telos Alliance (Livewire).^[3] It complements related standards like AES70 for device control and has influenced extensions in video-over-IP protocols such as SMPTE ST 2110, broadening its relevance in multimedia workflows.^[4] The standard's Protocol Implementation Conformance Statement (PICS) in Annex G aids certification and testing, ensuring reliable performance in high-stakes environments.^[1]

Overview

Purpose and Scope

AES67 is an open interoperability standard published by the Audio Engineering Society (AES) in 2013, with an addendum in 2014 and subsequent revisions in 2015, 2018, and 2023, designed for transporting low-latency, high-quality audio over IP and Ethernet networks in professional environments.^[1] It specifies protocols and formats to enable the exchange of uncompressed pulse-code modulation (PCM) audio streams, ensuring compatibility across diverse hardware and software implementations without reliance on vendor-specific technologies.^[5] The core purpose of AES67 is to facilitate seamless audio communication between devices from different manufacturers, eliminating proprietary lock-in and promoting a unified ecosystem for professional audio workflows. This standard targets applications such as broadcast production, live sound reinforcement, and fixed installations, where reliable, real-time audio distribution is essential. By leveraging established IP networking principles, AES67 bridges audio-specific requirements like precise timing and stream synchronization, allowing systems to interoperate efficiently on shared infrastructure.^[1]^[5] In terms of scope, AES67 covers linear PCM audio streams with sampling rates of 44.1 kHz or higher and bit depths of 16 bits or greater, up to 96 kHz/24-bit, supporting both multicast and unicast transmission modes for low-latency performance under 10 ms on Layer 3 IP networks. It assumes familiarity with basic IP networking concepts but addresses gaps in audio transport, such as media clock recovery, without extending to video, control data, or consumer-grade applications. Synchronization and transport mechanisms are defined to ensure interoperability but are elaborated in dedicated technical sections.^[5]^[6]^[7]

Key Features

AES67 supports the transmission of multiple audio streams over IP networks, enabling the handling of numerous channels with precise timing synchronization for coordinated playback across distributed devices. This capability allows for large-scale professional audio applications, such as live sound reinforcement, where systems can accommodate up to 512 channels at 48 kHz sample rates on a standard gigabit Ethernet network, depending on configuration and bandwidth allocation.^[2] The standard leverages IEEE 1588-2008 Precision Time Protocol (PTP), with the 2023 revision also supporting IEEE 1588-2019, to achieve low-latency synchronization, typically under 10 ms, ensuring lip-sync and phase coherence in multi-device setups.^[2]^[8] As an open standard developed by the Audio Engineering Society, AES67 promotes vendor-neutral ecosystems by defining a common interoperability layer for audio-over-IP protocols, facilitating integration without proprietary lock-in. It includes backward compatibility modes that allow seamless operation with legacy systems, such as those using Dante or Ravenna, by supporting configurable conformance levels that align with existing implementations.^[1]^[2] The standard incorporates robust error handling through RTP packetization and MTU specifications, minimizing disruptions in packet-based transmission over Ethernet. For enhanced reliability in critical environments, compatible systems may implement redundancy options like hitless protection switching via SMPTE ST 2022-7, which enables seamless failover between primary and secondary streams without audible interruptions.^[2]^[1] AES67's scalability extends to enterprise-level networks, operating over routable Layer 3 Ethernet infrastructures that support typical topologies like star configurations for centralized distribution or redundant rings for fault tolerance. This design ensures efficient handling of high-density audio routing in venues or broadcast facilities, with interoperability benefits extending to AVB/TSN environments for synchronized media transport.^[2]^[1]

Technical Specifications

Synchronization

AES67 relies on the IEEE 1588-2008 Precision Time Protocol (PTP) version 2 (PTPv2) to distribute a common reference clock across networked audio devices, ensuring precise timing for coherent multi-device operation. This protocol operates on a master-slave hierarchy, where one device is elected as the grandmaster clock using the Best Master Clock Algorithm (BMCA), which evaluates factors such as clock accuracy, stability, and priority to select the optimal time source. The grandmaster then transmits periodic synchronization messages to slave devices, allowing them to adjust their local clocks accordingly.^[4] The standard mandates support for the PTP Default Profile as defined in IEEE 1588-2008, while recommending the AES67 Media Profile outlined in Annex A of AES67-2015 for enhanced performance in professional audio environments. This profile specifies parameters such as sync message mean intervals ranging from 62.5 ms (2^{-4} s) to 2 s (2^{1} s) and announce intervals (default 2 s) to facilitate reliable clock election and recovery. Clock drift recovery is managed through ongoing PTP synchronization messages, with the BMCA enabling dynamic reselection of the grandmaster if the current one fails or underperforms, thus maintaining network stability.^[4]^[1]^[9] Network jitter and propagation delays are mitigated via hardware timestamping of PTP messages at the media access control (MAC) layer, which compensates for variable transmission times and achieves sub-microsecond synchronization accuracy essential for phase-aligned audio playback. For media streams, RTP timestamps are generated relative to the PTP-synchronized local clock at the application layer, further ensuring that audio samples align across devices despite network variations. This approach supports PTPv2 deployments on Ethernet networks, delivering phase accuracy within ±1 μs at 48 kHz sample rates to prevent audible artifacts in synchronized systems.^[10]^[11]

Transport Protocol

AES67 employs the Real-time Transport Protocol (RTP) over User Datagram Protocol (UDP) and Internet Protocol (IP) for the delivery of audio streams, ensuring low-latency transmission suitable for professional audio applications.^[12] This transport mechanism is defined in RFC 3550 and RFC 3551, which specify RTP as a protocol for real-time data transport over unreliable networks like UDP/IP. The RTP header includes essential fields such as sequence numbers to detect packet loss and reorder packets, timestamps for playout timing (which may reference Precision Time Protocol synchronization), and payload type indicators to denote the audio format, such as linear PCM variants.^[12] These elements enable reliable reconstruction of the audio stream despite potential network jitter or packet reordering.^[9] AES67 supports both multicast and unicast transmission modes to accommodate various network topologies. Multicast delivery, managed via Internet Group Management Protocol (IGMP) as per RFC 2236 and RFC 3376, allows efficient one-to-many distribution of audio streams, reducing bandwidth usage in shared environments.^[12] Unicast is also permitted for point-to-point connections, though multicast is emphasized for scalability. Session discovery and announcement utilize the Session Announcement Protocol (SAP) per RFC 2974 and the Session Description Protocol (SDP) per RFC 4566, which provide metadata including stream addresses, formats, and parameters to facilitate device interoperability.^[12] SAP announcements enable automatic detection of available streams on the network.^[9] Audio samples are packetized into small payloads to minimize latency, with a mandatory configuration grouping samples into 1 ms intervals—corresponding to 48 samples at 48 kHz sampling rates.^[12] Optional shorter packet times, such as 125 μs (6 samples at 48 kHz or 12 at 96 kHz), support high-sample-rate modes and compatibility with other protocols like AVB.^[12]^[13] These durations are specified in SDP during session setup, allowing receivers to adapt dynamically.^[9] For uncompressed PCM audio, RTP payload-specific headers provide mechanisms for error resilience, including sequence numbering at the payload level to identify missing sub-packets, along with explicit channel mapping to assign audio channels to specific positions in the stream.^[12] This structure supports multiplexing of up to eight channels per stream in the baseline mode, enabling efficient transport of multi-channel audio while aiding in partial recovery from packet errors without full retransmission.^[12]

Audio Encoding

AES67 employs uncompressed linear pulse-code modulation (PCM) as its core audio encoding format to ensure high-fidelity transmission and seamless interoperability across diverse IP-based audio systems. This approach prioritizes transparency and minimal processing overhead, making it suitable for professional applications such as live sound, broadcasting, and studio environments.^[8] The standard mandates support for 16-bit (L16) and 24-bit (L24) integer linear PCM, with 24-bit at 48 kHz serving as the baseline for compliance. Sample rates are specified at 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz to accommodate both consumer audio standards and high-resolution professional workflows, while higher rates like 192 kHz may be supported in optional implementations but are not required. Bit depths of 16 and 24 bits provide sufficient dynamic range for most applications, balancing audio quality with network efficiency.^[14]^[8] Streams support up to 8 channels per RTP flow, enabling diverse configurations including mono, stereo, and multichannel immersive formats such as 5.1 surround sound. Channel assignments adhere to the RTP payload format defined in RFC 3190, which outlines conventions for mapping audio channels to packet payloads for consistent decoding across devices. This structure allows for flexible grouping of channels into streams while maintaining synchronization within the overall network.^[15]^[12] By excluding lossy compression schemes and proprietary codecs, AES67 focuses exclusively on raw linear PCM to preserve audio integrity and reduce conversion latency in mixed-protocol chains, thereby facilitating plug-and-play interoperability without quality degradation. The PCM payloads are encapsulated within RTP packets for transport over UDP/IP, as detailed in the protocol specifications.^[14]^[8]

Latency and Performance

AES67 networks achieve baseline end-to-end latency of approximately 2-6 ms, enabling real-time audio applications in professional environments.^[16] This latency comprises several components: encoding delay of 0 ms for uncompressed PCM audio, network transit time of 1-2 ms in typical local Gigabit Ethernet setups, and buffering plus decoding overhead.^[17]^[18] The Precision Time Protocol (PTP) plays a key role in minimizing synchronization-induced delays to support this performance.^[8] Several factors influence AES67 performance, particularly in maintaining low latency under varying conditions. Network congestion can introduce packet delay variation, while appropriate buffer sizes—recommended at 1-2 ms—help mitigate this without excessively increasing overall delay.^[19] Quality of Service (QoS) markings, using Differentiated Services Code Point (DSCP) values such as EF (46) for PTP traffic and AF41 (34) for audio streams, enable prioritization to reduce queuing delays during contention.^[8]^[19] Jitter buffer requirements in AES67 are typically up to 2 ms to accommodate packet arrival variance caused by network imperfections, ensuring stable playback.^[18] With proper configuration, total system latency remains under 10 ms, suitable for live sound reinforcement and broadcast applications.^[8] The minimum latency in an AES67 stream can be expressed as:

\text{Latency} = (\text{Packet duration}) + (\text{Buffering delay}) + (\text{Processing overhead})

where packet duration is calculated as \frac{1}{\text{sample rate}} \times \text{samples per packet}; for example, 48 samples at 48 kHz yields 1 ms.^[17]^[19] This formulation highlights the trade-offs in stream configuration for balancing latency and reliability.^[18]

Interoperability

With AVB/TSN

AES67 enables compatibility with Audio Video Bridging (AVB) and its evolution into Time-Sensitive Networking (TSN) by mapping its audio streams onto AVB/TSN mechanisms, primarily through the IEEE 802.1Qav standard for stream reservation protocol, which reserves bandwidth for time-critical traffic, and IEEE 802.1AS for generalized Precision Time Protocol (gPTP) timing and synchronization.^[20] This mapping supports hybrid Layer 2 (AVB/TSN) and Layer 3 (IP-based AES67) deployments, allowing AES67 traffic to traverse AVB/TSN switches while leveraging their deterministic features, though gateways may be required for full bridging between protocol layers.^[2]^[21] The integration provides deterministic delivery of audio streams within TSN switches, ensuring bounded latency and reducing jitter to below 1 μs for AVB-compatible devices through gPTP's high-precision clock synchronization, which is essential for synchronized audio/video applications in professional environments. This results in reliable performance over shared networks, minimizing packet loss and variability compared to standard Ethernet. The AES67-2013 standard includes an AVB profile in Annexes C and D, defining transport and synchronization mappings that enable seamless bridging of AES67 endpoints into AVB domains without requiring reconfiguration of existing devices.^[20] However, realizing full benefits such as bandwidth reservation—up to 75% of link capacity guaranteed for time-sensitive streams—necessitates TSN-aware hardware in switches and endpoints, as standard AES67 implementations do not inherently utilize AVB/TSN reservations without specific support.^[22]^[23]

With Proprietary Audio-over-IP Protocols

AES67 facilitates interoperability with proprietary Audio-over-IP (AoIP) protocols such as Dante, RAVENNA, and Livewire+ by providing a standardized transport layer that allows devices to switch into an AES67 compatibility mode, enabling direct multicast stream exchange without proprietary extensions. This mode aligns on core elements like RTP payload formats, PTPv2 synchronization, and SAP/SDP discovery, reducing the need for external conversion hardware in mixed environments. While gateways remain an option for bridging incompatible protocols, native AES67 support minimizes processing overhead and preserves low-latency performance. Dante, developed by Audinate, incorporates AES67 compatibility through a dedicated mode configurable directly in the Dante Controller software, allowing Dante devices to transmit and receive AES67 multicast flows alongside native Dante streams. This enables seamless integration with non-Dante AES67 devices, with support for up to 512 bidirectional channels at 48 kHz and 256 at 96 kHz for high-fidelity applications. As of September 2025, Dante's AES67 mode supports 96 kHz via firmware updates for compatible devices.^[24]^[25] The mode prioritizes PTPv2 for clocking when engaged, ensuring synchronization alignment across hybrid networks. RAVENNA, originated by ALC NetworX (now part of Lawo), exhibits native overlap with AES67 due to its foundational influence on the standard's development, where RAVENNA's RTP-based transport and PTPv2 synchronization were key contributors to AES67's interoperability framework. As a result, RAVENNA devices support AES67 as a predefined operational profile, enabling plug-and-play connectivity without additional configuration for core audio transport at 48 kHz and up to 8 channels per stream. This harmonization of PTPv2 profiles—using the IEEE 1588-2008 default—facilitates precise phase and sample-accurate timing in shared networks. Livewire+, from the Telos Alliance, represents an early adoption of AES67 in broadcast environments, with its implementation in the Axia xNode interface marking the industry's first fully compliant system shipped in late 2013. This upgrade from the original Livewire protocol (introduced in 2003) ensures full adherence to AES67-2013 specifications, supporting direct AES67 stream generation and consumption over IP for audio, control, and GPIO in studio settings. Livewire+ maintains backward compatibility while extending to 48 kHz/24-bit PCM encoding, positioning it as a converged solution for radio and television workflows. In scenarios requiring protocol bridging, such as Dante-to-AES67 conversion, dedicated gateways perform stream transcoding by decoding proprietary formats and re-encapsulating into AES67 RTP packets, which can introduce additional latency from processing delays. Native AES67 mode in compatible devices circumvents these penalties by enabling direct multicast interoperability, preserving the standard's target of under 10 ms end-to-end latency without format conversion.

Development History

Origins and Standardization

AES67 emerged in response to the growing fragmentation in audio-over-IP (AoIP) technologies within professional audio applications, where proprietary protocols such as CobraNet, EtherSound, Dante, and RAVENNA offered high-performance streaming but lacked interoperability, complicating network integration for live sound and broadcast environments.^[14] In late 2010, the Audio Engineering Society (AES) addressed this challenge by forming the SC-02-12-H Task Group on High-Performance Streaming Audio-over-IP Interoperability, designated as project AES-X192, to develop a common specification leveraging existing standards without inventing new technologies.^[26] The task group, chaired by Kevin Gross of AVA Networks, conducted bi-weekly web conferences and face-to-face meetings to foster collaboration among over 100 participants from the audio industry.^[14] The AES led the standardization effort, drawing input from key broadcast organizations including the European Broadcasting Union (EBU), whose Audio Contribution over IP (ACIP) recommendations provided foundational inspiration for interoperability goals, and the Society of Motion Picture and Television Engineers (SMPTE).^[2] Major vendors played pivotal roles by contributing technical expertise; Audinate, creators of Dante, and ALC NetworX, developers of RAVENNA, were among the early participants ensuring the standard's compatibility with their ecosystems alongside others like Livewire and QLAN.^[14] Development progressed through iterative drafts beginning in 2011, with extensive public review to refine the specification for broad adoption.^[14] The process spanned approximately 2.5 years, culminating in the formal publication of AES67-2013 on September 11, 2013, as an open AES standard focused on general audio networking.^[2] This timing positioned AES67 as a precursor to SMPTE ST 2110-30, which later referenced it for audio transport in broadcast video systems, establishing AES67 as the baseline for high-performance AoIP interoperability.^[27]

Revisions and Updates

The AES67 standard, initially published in 2013, underwent its first revision in 2015 to address minor issues identified during interoperability testing events known as "plugfests." This revision, AES67-2015, incorporated clarifications to interoperability requirements, updated references to relevant RFC documents such as RFC 7273, and provided corrections in sections related to media clock identification, network transport, and session description protocols.^[28]^[29] In 2018, AES67-2018 introduced further refinements, primarily adding a Protocol Implementation Conformance Statement (PICS) as Annex G to facilitate standardized testing and verification of compliance across implementations. This update focused on resolving ambiguities from practical deployments without altering core functionalities.^[1] The most recent revision, AES67-2023, ratified on December 4, 2023, builds on prior versions with targeted enhancements for improved alignment with related standards like SMPTE ST 2110-30. Key changes include explicit support for IEEE 1588-2019 Precision Time Protocol (PTP) handling, the addition of zero RTP timestamp offset to enable seamless interoperability with ST 2110-30 audio streams, and clarification of RTP payload requirements from RFC 3551, including the disallowance of silence suppression to ensure consistent audio flow. Additionally, the revision replaces the mandatory use of administratively scoped multicast addresses with a requirement for general support of such addresses, promoting better compatibility with ST 2110 ecosystems and enhanced multicast scalability. Stream modes were defined in Section 7 and Annex G to standardize streaming behaviors. These modifications maintain backward compatibility with earlier versions, preserving the essential features of the 2013 specification to minimize disruption in existing AES67 deployments.^[8]

Adoption

Industry Applications

AES67 plays a pivotal role in modern broadcast environments, particularly through its integration with the European Broadcasting Union's (EBU) Audio Contribution over IP (ACIP) workflows, which facilitate high-quality audio feeds for remote production and contribution links in IP studios.^[30] This standard enables broadcasters to leverage standard IP networks for efficient signal distribution, supporting scalable infrastructures that replace traditional baseband systems with flexible, multicast-based audio routing.^[31] In live sound production, AES67 supports deployments in concerts and theaters by enabling distributed mixing architectures that minimize cabling requirements, such as routing signals from front-of-house positions to stage monitors over Ethernet.^[9] These applications benefit from AES67's interoperability, allowing seamless audio transport across large venues while maintaining synchronization essential for real-time performances.^[21] Its compatibility with protocols like Dante further enhances flexibility in such dynamic setups.^[21] For fixed installation and AV systems, AES67 underpins audio infrastructures in venues such as houses of worship and corporate spaces, where it enables zoned audio distribution for targeted playback in multi-area environments.^[32] This approach supports low-latency zoning, allowing precise control over audio zones without the constraints of analog wiring, thereby improving scalability and ease of management in permanent setups.^[33]

Commercial Products and Implementations

Telos Alliance's Livewire+ system, introduced in 2015, was among the earliest fully AES67-compliant audio-over-IP solutions for broadcast, enabling seamless integration of audio streams in professional radio environments and now deployed across thousands of radio stations worldwide.^[34]^[35] Merging Technologies has offered native AES67 support in products like the Anubis audio interface and MassCore processing engine since the standard's early implementation around 2014, allowing multicast audio transmission in RAVENNA/AES67 networks for studio and live production workflows. Riedel's Bolero wireless intercom system provides AES67 compliance, including in its Standalone 2110 mode for SMPTE ST 2110/AES67 networks, facilitating decentralized antenna connections and integrated point-to-multipoint operation in broadcast and event settings.^[36] Audinate's Dante-enabled devices support AES67 mode, enabling multicast audio interoperability between Dante and non-Dante AES67 RTP devices for transmitting and receiving flows in mixed-network environments.^[37] Software tools such as Audinate's Dante Domain Manager configure AES67 clocking and domains to act as gateways for audio exchange between Dante and external AES67 systems.^[38] Open-source libraries, including GStreamer plugins, implement RTP and PTP for generating and receiving AES67-compliant streams in custom applications.^[39] Adoption trends show 4,700 AES67-compatible products shipping by 2025, per RH Consulting, with notable growth in broadcast through organizations like the BBC supporting the standard for IP audio workflows and in live events via integrations such as those from Clear-Com.^[40]^[41]

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Learn about practical methods for IP Networking, AES67, and Dante when utilizing Arcadia Central Station. Watch Now trending_flat. Recording - Arcadia R3 Setup ...