[LAD] AoIP question

Winfried Ritsch ritsch at iem.at
Sat Oct 11 12:36:04 UTC 2014


Thank you for the overview of the AoIP stuff, I just not up to date now.

> >> 
> >> So my thought is that AoIP at low latencies depends on a local net with
> >> no
> >> collision possible. Am I making sense? or am I missing something?
> > 
> > just to add my two cents for ideas:
> > 
> > In robotic there is a open source solution for linux kernels called rtnet,
> > which has exactly the purpose to prevent collision and garantee low
> > latency
> > over network:
> > 
> > http://www.rtnet.org/

> This looks like the same idea I had in the begining. I may look farther
> when I have time. Prioritizing audio (RT) through the net and tunnelling
> the low priority packets through. It is nice to know I don't have to do
> all the work and there is already something like this out there.

Note: rtnet uses time slots and works at kernel level. This means there are 
reserved times for each device, which guarantee very low latency (lower than 
sample-time) and no packet drop for very low latency. The interface using 
rtnet could do like 3-samples latency. No collisions without buffering, which 
switches uses to prevent them. Anyhow it works only in a dedicated Ethernet 
zone... so it is easy to use to implement customized dedicated solutions, 
(multichannel speaker systems or multichannel microphone arrays) but hard to 
do fit any standard for use with every device or unpredictable device count 

 Winfried Ritsch
Ritsch, Winfried, Ao.Univ.Prof. Dipl.-Ing.
   Institut 17 Elektronische Musik und Akustik
   8010 Graz, Inffeldgasse 10/III
E-Mail  ritsch at iem.at
Homepage        http://iem.at/ritsch
Mobil   ++436642439369

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