Livewire (networking)

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Livewire
Livewire Badge.jpg
Manufacturer Info
Manufacturer Axia Audio, a division of Telos Systems
Development date 2003
Network Compatibility
Switchable Yes
Routable Yes
Ethernet data rates Fast Ethernet, Gigabit Ethernet
Audio Specifications
Minimum latency 0.75 ms[1]
Maximum sampling rate 48 kHz[2]
Maximum bit depth 24 bits[2]

Livewire is an audio over Ethernet system created by Axia Audio, a division of Telos Systems. Livewire was introduced in 2003 and is used primarily in radio station applications. Designed as a superset of functionality utilising common protocols and formats, Livewire is available as an open standard through Axia's partner program[3][4] and is interoperable with other RAVENNA standards-based systems and equipment.

Benefits[edit]

Livewire provides "anywhere to anywhere" routing of audio, using multicast sources and destinations of uncompressed PCM or AAC audio globally visible on a LAN. Audio is carried using standard ethernet 8-conductor cables and RJ-45s, which are smaller than XLR interconnects, improving flexibility while reducing the amount of wiring required for installations.[5]

Protocol[edit]

The following table lists ports and protocols used in Livewire systems.[6][7][8]

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[edit]

  1. ^ "Best Practices in Network Audio" (PDF). Audio Engineering Society. 2009. Retrieved 2010-05-05. 
  2. ^ a b Introduction to Livewire (PDF), Axia Audio, April 2007, retrieved 2011-06-21 
  3. ^ Axia Debuts Livewire Limitless License, Radio, 2011-04-07, retrieved 2011-07-10 
  4. ^ "Axia partners". Axia Audio. Retrieved 22 June 2011. 
  5. ^ Matt Rockwell (2011-07-01). "Axia Audio Element Leads New Studio". Radio World. Retrieved 2011-07-10. 
  6. ^ "Configuring Windows Firewall for use with the Axia IP-Audio Driver". Axia audio. 31 October 2006. Retrieved 5 November 2013. 
  7. ^ "Axia IP-Audio Driver for Windows, rev. 2.5 manual". Axia audio. August 2010. Retrieved 5 November 2013. 
  8. ^ 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. 

External links[edit]