IEEE 1722.1 Protocol Features

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