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Livewire+
Livewire+
Manufacturer Info
Manufacturer	Axia Audio, a brand of Telos Alliance
Development date	2003; 21 years ago
Network Compatibility
Switchable	Yes
Routable	Yes
Ethernet data rates	Fast Ethernet, Gigabit Ethernet
Audio Specifications
Minimum latency	0.75 ms
Maximum sampling rate	48 kHz
Maximum bit depth	24 bits

Livewire is an audio-over-IP system created by Axia Audio, a division of Telos Alliance. Its primary purpose is routing and distributing broadcast-quality audio in radio stations.

The original Livewire standard was introduced in 2003 and has since been superseded by a second version, Livewire+. Livewire+ includes compatibility with the AES67 and Ravenna standards to allow interoperability with equipment from other manufacturers. Designed as a superset of Livewire functionality utilizing common protocols and formats, Livewire+ is available as an open standard through Axia's Livewire+ Partner Program.

Livewire+ provides flexible routing and transport of audio streams using multicast networking, with the ability to connect any input to any output (known as "anywhere-to-anywhere routing").^{[citation needed]} Distribution utilises standard IP and Ethernet over twisted pair cabling.

Protocol

The following table lists ports and protocols used in Livewire systems.^[3]^[4]^[5]

Port	Protocol	Multicast Address	Purpose	Notes
67, 68	UDP		BOOTP Server/Client	Remote IP address assignment
93	TCP		Livewire Routing Protocol	Also provides transparent passing of custom messages, similar to the Ancillary Data Transmission feature of AES3
123	UDP		Network Time Protocol
514	UDP		Syslog	Activity logging to a syslog receiver.
2055	UDP	239.192.255.4	Multicast-based GPIO (CMsg2 protocol)	GPIO commands, GPIO node → console-type endpoint
2060	UDP	239.192.255.4	Multicast-based GPIO (CMsg2 protocol)	GPIO commands, console-type endpoint → GPIO node
4000	UDP		Livewire Advertisement and Source Allocation Protocol	Verbose advertisement and source allocation requests
4001	UDP	239.192.255.3	Livewire Advertisement and Source Allocation Protocol	Periodic and verbose announcements; Source allocation state announcements and responses
4002	UDP	239.192.255.3	Engine Supervision Protocol
4010	TCP		Livewire Control Protocol
4011	UDP	239.192.255.4	LWCP for Accessory Modules	Module → Console
4012	UDP	239.192.255.3	LWCP for Accessory Modules	Console → Module
5004	UDP	239.192.x.x	RTP Livewire Audio	Last two address octets pertain to Axia channel ID, e.g. `9999` = `39 15` (hex `27 0F`)
7000	UDP		Livewire Clock	One device assigns itself as LAN-wide reference, all other devices slave to it
9997	TCP		Protocol logging	Debug protocol logging for Element

References

^ "Best Practices in Network Audio" (PDF). Audio Engineering Society. 2009. Retrieved 30 July 2015.
^ ^a ^b Introduction to Livewire+ (PDF), The Telos Alliance, May 2015, retrieved 30 July 2015
^ "Configuring Windows Firewall for use with the Axia IP-Audio Driver" (PDF). The Telos Alliance. 31 October 2006. Retrieved 30 July 2015.
^ "Axia IP-Audio Driver for Windows, rev. 2.5 manual" (PDF). The Telos Alliance. August 2010. Retrieved 30 July 2015.
^ Steve Church; Skip Pizzi (10 September 2012). Audio Over IP: Building Pro AoIP Systems with Livewire. CRC Press. pp. 4–. ISBN 978-1-136-03057-4.

[AESbestprac-1] "Best Practices in Network Audio" (PDF). Audio Engineering Society. 2009. Retrieved 30 July 2015.

[LWintro-2] Introduction to Livewire+ (PDF), The Telos Alliance, May 2015, retrieved 30 July 2015

[axiafwpdf-3] "Configuring Windows Firewall for use with the Axia IP-Audio Driver" (PDF). The Telos Alliance. 31 October 2006. Retrieved 30 July 2015.

[axiaipadman-4] "Axia IP-Audio Driver for Windows, rev. 2.5 manual" (PDF). The Telos Alliance. August 2010. Retrieved 30 July 2015.

[ChurchPizzi2012-5] Steve Church; Skip Pizzi (10 September 2012). Audio Over IP: Building Pro AoIP Systems with Livewire. CRC Press. pp. 4–. ISBN 978-1-136-03057-4.

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Livewire (networking)

Protocol

References