[LAD] AoIP question

Len Ovens len at ovenwerks.net
Sun Oct 5 20:51:36 UTC 2014

On Sun, 5 Oct 2014, tom at trellis.ch wrote:

> Hi, i'm following the thread of the ongoing topics around transmitting
> audio over IP infrastructure.
> As a scenario, at point a) an analog signal is injected that will be
> played back (analog) at point b) with the lowest possible (and constant)
> latency.
> How do you intend to handle diverging clocks of the audio interfaces
> (ADC/DAC) at both (a/b) ends?

AES67 (and other formats) use PTP (IEEE 1588-2008) to keep the system 
clocks aligned at a usec level. The media clock is then derived from that. 
The media clock on both systems should therefore be syncronis.

BTW, AES67 reading and understanding is not fun or easy as AES67 
constantly refers to other documents. Everything in there is already 
specified in some other place. AES67 basically just tells which of the 
available network standards should be used together so that systems can 
talk to each other.

Len Ovens

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