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| sACN | |
|---|---|
| Name | sACN |
| Caption | Streaming Architecture for Control Networks protocol stack |
| Developer | Entertainment Services and Technology Association |
| Released | 2006 |
| Latest release | 2016 |
| Status | Active |
sACN
sACN is a network protocol designed for the distribution of lighting control data over Internet Protocol, enabling transmission of channel-level parameters for entertainment technology and architectural lighting systems. It complements other protocols in the field such as DMX512-A, Art-Net, and RDM (lighting) by leveraging Ethernet (computer networking) and UDP to carry high-volume, low-latency control streams across local and routed networks. sACN is standardized and maintained by the Entertainment Services and Technology Association, and it is widely adopted by manufacturers, venues, and production companies.
sACN provides a framework for sending multiple universes of lighting control over IP (networking), supporting simultaneous streams of channel data for fixtures, dimmers, and media servers. The protocol maps the traditional DMX512-A 512-channel universes into an Internet Protocol payload, allowing integration with network infrastructure from vendors such as Cisco Systems, Juniper Networks, and Arista Networks. sACN's design emphasizes compatibility with existing lighting control console workflows used by companies like ETC (lighting), MA Lighting, Avolites, Chamsys, and High End Systems.
sACN defines packet formats, addressing, and synchronization mechanisms within the IETF model using Layer 3 and Layer 4 transports. Payloads are carried in User Datagram Protocol datagrams with an sACN-defined framing structure and identifiers that include a sender CID based on UUID. The standard specifies universe numbering, priority fields, sequence numbering, and optional per-packet footprint metadata to support large deployments in venues such as MetLife Stadium, Wembley Stadium, Sydney Opera House, and Lincoln Center.
sACN streams, often called "universes," are transmitted as multicast or unicast UDP flows to support either broad distribution to many devices or point-to-point links between controllers and fixtures. Discovery and source identification rely on CID and text-based labels to allow consoles from Strand Lighting or nodes from ETC to reliably select sources. A synchronization mechanism permits coordinated updates across multiple universes for applications used in productions like Broadway (theatre), Cirque du Soleil, and Super Bowl halftime shows. The protocol includes features for prioritization and merging of conflicting sources to support backup systems used by operators in facilities like Royal Opera House.
sACN is applied in live production, theatre, broadcast, themed entertainment, architectural installations, and film stages. Large-scale deployments appear in arenas operated by Madison Square Garden Company, theme parks by Walt Disney Parks and Resorts, and cruise ships by Carnival Corporation. Manufacturers integrate sACN into fixtures, media servers, and architectural controllers from firms such as Philips Lighting/Signify (company), Osram, LumenRadio, and Showtec. The protocol also interfaces with control systems in venues managed by SBE Entertainment Group and rental houses like PRG (Production Resource Group).
Implementations of sACN exist in hardware endpoints, software consoles, and gateway devices from vendors including Artistic Licence Engineering, Node-Si, ENTTEC, Pathway Connectivity, and GrandMA. Interoperability is tested at industry events and shows involving organizations like the PLASA trade association and the Infocomm exhibitions. Gateways translate between sACN and protocols such as Art-Net, ACN (protocol suite), and RDM (lighting), while network management solutions from Hewlett Packard Enterprise and Netgear are used to route, mirror, and monitor sACN traffic in large installations.
sACN operates over UDP and typically within trusted local area networks managed by venue IT teams from organizations like Madison Square Garden Company or The Shubert Organization. Security practices include network segmentation using VLAN (computing) and access control lists configured on switches from Cisco Systems and Juniper Networks; encryption and authentication are not part of the core sACN specification and are handled by infrastructure measures or tunnel technologies such as IPsec or VPN appliances from Palo Alto Networks. Reliability strategies include redundancy with primary/backup senders, source prioritization, and use of managed multicast with IGMP snooping in networks deployed by companies like Arista Networks.
sACN originated within the Entertainment Services and Technology Association technical committees as part of the ACN family to bring DMX-style control to IP (networking). The protocol evolved through versions to address real-world production needs and was influenced by earlier protocols and standards like DMX512-A and networked media approaches demonstrated by vendors such as Color Kinetics and Lumenpulse. The standard saw adoption across the industry through collaborations among manufacturers, rental companies, and venues, with formal updates and guidance published by the Entertainment Services and Technology Association committees and reviewed at industry gatherings such as PLASA Show and LDI (trade show).
Category:Networking protocolsCategory:Stage lighting