Livewire is an audio-over-IP system created by Axia Audio, a division of The Telos Alliance. Its primary purpose is routing and distributing broadcast-quality audio in radio stations.
| Livewire+ |
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| Manufacturer | Axia Audio, a brand of The Telos Alliance |
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| Development date | 2003; 18 years ago |
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| Switchable | Yes |
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| Routable | Yes |
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| Ethernet data rates | Fast Ethernet, Gigabit Ethernet |
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| Minimum latency | 0.75 ms[1] |
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| Maximum sampling rate | 48 kHz[2] |
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| Maximum bit depth | 24 bits[2] |
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The original Livewire standard was introduced in 2003 and has since been superseded by a second version, Livewire+.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.
ProtocolEditThe following table lists ports and protocols used in Livewire systems.[3][4][5]
| Port | Protocol | Multicast Address | Purpose | Notes |
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| 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 |