RME Audio AVB Tool, Руководство пользователя

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5. AVB Connectivity
Network Control
The AVB Tool is an AVB endpoint device that can be configured with the IEEE Standard for Device
Discovery, Connection Management, and Control Protocol for IEEE 1722™ Based Devices, in short:
AVDECC .

This device does not provide an AVDECC controller for other devices on a network. To
establish an AVB connection between devices, a separate controller is required.
There are several AVDECC controllers available for download from different manufacturers that support
the commands required to
• identify the device,
• adjust its sample rate and clock source, and
• create connections to or from it.
The RME Digiface AVB includes an AVDECC controller.
Many other configuration options of the AVB Tool are at this time not implemented in generic AVDECC
controllers. Both the control on the device and its web remote can be used to configure additional
options.

An AVDECC controller can optionally acquire the device. This means that the AVB Tool is
no longer configurable by display or web remote until the acquisition is released.
Audio Streaming
The AVB Tool has eight outgoing and eight incoming stream ports. Each one can be configured to
contain 1-8, 12 or 16 audio channels in AAF or AM824 format, or 0 audio channels in CRF format.
In order to establish a connection ( stream ) between two AVB devices, the following conditions must be
fulfilled:
1. There must be a physical connection between the devices.
2. All switches between the devices must be certified AVB switches (or compatible).
3. An AVDECC Controller is required to find the devices and to connect them.
4. Talker and listener must support the stream format and channel count.

A stream between two AVB devices is deterministic, has a fixed latency, and reserved
bandwidth.
5.1. Identifying a Device Remotely
When several AVB Tools are connected to the same network, each device has its own remote control. To
quickly reveal which device is currently being controlled, the web remote and any AVDECC controller can
send an
Identify command. This triggers an animation of the front panel level meters of the
corresponding device.
To start device identification with the web remote:
RME AVB Tool User’s Guide
5. AVB Connectivity | 22