Dante over Internet

Dante is a proprietary protocol for single purpose LAN installations in professional studios and venues and meeting room installations. Some research project testet it over WAN https://resurface.audio/dante-over-distance-remote-is-a-reality/

Details in https://pro.focusrite.com/case-studies/live-sound/rednet-enables-‘worldfirst’-crossborder-interactive-performance

early experiments revealed a 9.5ms round-trip time for data packets sent from London to Edinburgh and back. Whilst initially encouraging, the nature of the JANET network having 18 million users means that at peak times, the increased traffic would force this round-trip time to 15ms or more, with occasional peaks of up to 30ms. Ferguson reflects, “given this was a live, keynote performance to open the conference, I erred on the side of caution. Even though evenings are generally quiet times for traffic, we simply set the buffer on our RedNet interfaces to 20ms at each side: 40ms overall. A little longer than you’d ideally want for drums, but safe, and absolutely useable for the synthetic textures we were getting from Edinburgh

Amit Peleg from Peltrix did three experiment concert sessions together with Dante engineers on June 21-30, presented in the video discussed below, as it was shown in a webinar this week.

The explanation of Band latency experience is very easy to follow even for musicians, albeit misses any scientific background and they mention themself that a study with the number of subject=1 is not real.
Their customer Blue Note Group got three Jazz musicians for the experiment in Sony Hall NY, Howard Theatre Washington, DC and SIR Nashville.
Good Telco connection was very tough to organize. All was done in Layer3. All Sites offered 1GBps connection MPLS with ISP-routing between, no physical point2point connection.

  • GPS from Sonifex provided clock sync in <1ms.
  • Yamaha Rsio64D added 3 Dante cards with experimental patched firmware for different latencies, to keep set latency buffer down to 200µs latency
  • 14ms was used in remote latency setting!!
  • all wired IEM and Mic
  • no local PA, could have just used rehearsal basement as well
  • no Video planned between musicians, only recording for diary
  • First prototypes of Dante Video devices available internally, showing small latencies of xx??
  • Possible to use Video even with additional latency of 50ms, as measured in professional timekeepers in swim meet(human=visual against modern electronic timekeepers), Entrainment(fall in sync, tap along) is more precise with audio than with video.
  • Green screen for two sites, projected into main stage
  • Bolin PTC cams 1080p with Patton FPX6000 Decoder
  • vMix
  • used some new tools for network debugging
  • The all forgot to measure any latency at all. Uuups.
  • Surprised by newby error to get audio over Zoom and Dante, and surprised to find out Zoom is in fact …later.
  • More than 50 people were involved.

After the Video ended there was 15mins Q&A.

  • Domain Manager can do ptpv2 in the meantime, and the three venues had separate clocks. SamplerateConversion was used at the beginning, but only between two local clocks, so disregarded as error in architecture and all drift was diluted in buffer.
  • MPLS was called „public fiber“ and generally had 6…14ms between each location, including jitter.
  • All QoS was switched off
  • 2 month delay because new fibers had to be installed over several miles in the pavement of NY
  • Bandwidth: each 4channels=6MBits
  • Framerate was 1080p30, experiments with 720p60
  • Both sound snippets of a few seconds sounded pretty good
  • The Musicians were happy (to play again)
  • There was no mentioning of 10 years of JamKazam, Soundjack, jacktrip.org, Elk.audio or digital-stage.org. The narrative was this is a world’s first technology.

Hello Dante Family: We have a Dante Over Distance application requiring the transport of +100 channels of Dante over an unmanaged network, the Public Internet or VPN with 100ms-250msec latency. The project does not have the budget for a fiber optic or manage low latency connection. If we use GPS PTP Clocks on each end and a Dante Domain Manager, will this work?

The Peltix application above is impressive. However, I do notice that the connection between locations is a shared fiber. Our application above is a one-way audio transport, and there is no collaboration or bidirectional transport.

Hi, welcome!
What latency do you need?
Audio only?
I did not test this myself - I only collect the success stories :wink:
Anyone can chime in here please.
Claudio from DirectOut would be great source as he did a presentation during 2021 Tonmeistertagung.
I applaud all technology and people who get NMP solved!