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The receiver compares the incoming presentation time of each sample to the current time and buffers
the sample until the presentation time is has come.
The offset (maximum transit time) is specified by the AVB standard as 2 ms for class A traffic, which is
enough time for the signal to pass through a very large network under full load with up to seven 100
MBit/s switches along the way. By default, most AVB products will use this offset. In smaller networks
with less hops or 1 GBit/s link speed, the offset can be adjusted to lower values, such as 0.3 ms, 0.6 ms
or 1 ms. In the event that the chosen offset is too low, the listener detects that the requested
presentation time has already passed and the audio data is discarded.
The M-32 AD Pro acts both as a talker with a specified offset of 2 ms, adjustable down to 0.3 ms, and
as a listener - where the latency depends on the talker.
In AVB networks, the latency is always specified by the talker and guaranteed by the
listener - with nanosecond accuracy. This behavior is plug and play and does not require
any user interaction or monitoring.
5.4.1. Adjusting the network latency
The default presentation time offset of 2 ms for outgoing streams can be changed when lower
latencies are required.
Reducing the offset to a lower value can prevent audio to be played out depending on
the network.
This setting can only be accessed on the web remote.
To adjust the presentation time offset:
1. Connect the device by USB or network cable and open the web remote.
Section 8.5.1, "Finding the Device on a Network"
2. Open the Settings .
3. Activate
Expert Settings.
4. Choose a new Presentation Time Offset in the drop down menu. It is immediately applied.
Changing the presentation time offset briefly interrupts all incoming and outgoing AVB
streams.
RME M-32 AD Pro User's Guide
5.4. AVB Network Latency | 18
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