.. link: 
.. description: IEEE 1722.1 (AVDECC) Protocol Features
.. category: articles
.. date: 2013/07/28 15:07:51
.. title: IEEE 1722.1 Protocol Features
.. slug: 1722.1-features
.. tags: AVDECC, 1722.1

Overview
--------

IEEE 1722.1 provides the Audio Video Discovery, Enumeration, Connection management, and Control (AVDECC) protocol for AVB devices. 

Discovery
---------

* Advertising
* Querying (Global and Specific)
* Support for redundant networks

Enumeration and Control
-----------------------

* Describe the internal structure of the device from the stream entry/exit through to the "physical" entry/exit
* Describe the internal structure within the different limitations of the device (channel limits at different sample rates, etc)
* Describe the internal latency through the device from the defined timing reference plane to the "physical" world (or the define latency from reference plane to reference plane via the DSP)
* Describes and controls the clocking model within the device to configure media clocking sources, sample rate converters, etc.
* Describe the AVB capabilities of the interfaces and provide the current AVB related information (802.1AS GMID, MSRP domain) for each AVB interface
* Describe and control the mapping of media sources and sinks to channels within the stream sinks and sources
* Describe and control the signal chains (DSP, mute, volume, mixers, selectors, etc) through the device
* Provide user settable names for many objects within the device including stream, media sources and sinks (jacks), controls, etc
* Describe and control generic control points within the device (location information, enables, video camera controls, etc)
* Perform key management for securing the network
* Perform basic authentication of controllers
* Enable and disable transport and stream security
* Distributes updates to interested controllers
* Provides diagnostic information such as avb interface event counters and errors, stream packet event counters and errors, and clock domain lock status, as well as vendor specific counters when necessary.
* Transport AVC protocol, HDCP IIA key exchange protocol, and vendor specific protocols.

Connection Management
---------------------

* Connection/disconnection of streams
* Persistent connections
* Status query for both AVDECC Listeners and AVDECC Talkers
* Transport of relevant SRP data