1. Open the AVB Tool web remote in a browser (see
Finding the Device on a Network]
)
2. Press the
identify
icon. The front panel level meters of the controlled device will show an
animation.
Depending on the controller, the animation may persist infinitely or stop after a short
period of time.
5.2. Changing the Device Name
A custom name can be assigned to the device. It is used to identify the AVB entity with AVDECC
controllers. It also allows the access to the web remote without using the IP address on Apple macOS™
computers.
The device name is stored to and recalled from
presets
. Loading a preset can therefore
change the device name. The device name is not affected by firmware updates.
Changing the device name is only possible via web remote or AVDECC controller.
5.3. AVB Stream Size and Format
In an AVB network, a
stream
describes a connection between a
talker
and one or more
listeners
. It
consists of a fixed number of audio channels at a fixed sample rate. The
stream port
of the talker and the
listener must be configured to have the same amount of channels and stream format. Once a stream is
connected, each AVB switch along its way ensures that the audio channels can pass in time, with a
higher priority than other network traffic.
For audio transport, AVB audio endpoints support the AM824 Stream Format or the more efficient AVTP
Audio Format (AAF). Additionally, they may support the Clock Reference Format (CRF), which contains
only clock information, but no audio.
The AVB Tool supports a total of
eight incoming streams
and
eight outgoing streams
. Each stream port
can be individually configured to contain
1-8, 12 or 16 channels
in AM824 or AAF format. Additionally, a
stream port may be configured for 0 channel CRF streams.
5.4. AVB Network Latency
All devices in an AVB network share the same time. This allows the sending device (
talker
) to specify the
precise point of time when its audio samples should be played out at the receiver side (
listener
). This is
achieved by adding an
offset
to the current time and sending the resulting timestamp with each sample
transmitted. The timestamp is called "presentation time" and has nanosecond precision. For comparison,
a single sample at 48 kHz has a duration of over 20800 ns.
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 audio stream may experience drop-outs or
distortion.
RME AVB Tool User’s Guide
23
| 5.2. Changing the Device Name
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