V1.0 | 2019-07-09

Overview of AVB and TSN

TSN - Time Sensitive Networking

� AVB/TSN IntroductionPrecision Time Protocol (gPTP)Stream Reservation Protocol (SRP)Transport Protocol (AVTP)Example

Agenda

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� Scalability� Choose the right traffic class for you application

� Timing Guaranties� Attach to each traffic class the expected latency and priority

� Reliability� Give for each traffic class a bandwidth guaranty� Consider redundancy if needed� Ensure stable traffic by policing

TSN BenefitsAVB/TSN Introduction

Scalability

Timing Guaranties

Reliability

Ethernet

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AVB-Domain, Endpoints, Talker, Listener And BridgesAVB/TSN Introduction

ListenerEndpointTalkerEndpoint

Bridge/Switch

Ethernet LAN

AVB-Domain

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� Multicast by means of Ethernet � Destination MAC Address: x1:xx:xx:xx:xx:xxAVB-Talker And Listener With BridgingAVB/TSN Introduction

Streamsource

AVB Talker + Bridge

EthernetPHY

Ethernet MAC+VLAN

Streamdestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

Streamdestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

xxxxxxx1

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Standalone AVB-Bridge / AVB-SwitchAVB/TSN Introduction

Streamsource

AVB Talker

EthernetPHY

Ethernet MAC+VLAN

StreamDestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

AVB Bridge / AVB Switch

Streamdestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

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� Loss of Data and packet transmission in order� AVTP-Frames offer sequence numbers to identify loss and out of order transmission

� Throughput� Reservation of bandwidth for every stream in Bridges and AVB-Talker

� Delay and Jitter� Control of data streams by means of queueing/shaping

Quality of ServiceAVB/TSN Introduction

Precondition for QoS is a common time base

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� Clock synchronization throughout the AVB/TSN-Domain by means of gPTP� Master-, Slave- and Transparent Clocks� One reference clock (Grandmaster-Clock) per AVB/TSN-Domain

> Static with defined clock hierarchy> Dynamic with negotiated hierarchy by means of gPTP (BMCA)

Time Aware SystemsAVB/TSN Introduction

Streamsource

AVB Talker

EthernetPHY

Ethernet MAC+VLAN

StreamDestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

AVB Bridge / AVB Switch

Streamdestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

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� Quality of Service (QoS) � Bandwidth reservavtion by measn of SRP� Priorisation and control of bandwidth by means of FQTSS

Advanced FunctionalityAVB/TSN Introduction

Streamsource

AVB Talker

EthernetPHY

Ethernet MAC+VLAN

StreamDestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

EthernetPHY

Ethernet MAC+VLAN

EthernetPHY

AVB Bridge / AVB Switch

Streamdestination

AVB Listener

EthernetPHY

Ethernet MAC+VLAN

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� Define hierarchy of the AVB/TSN domain� Static by means of configuration� Dynamic by means of Best Master Clock Algorithm (BMCA)� Every Ethernet link has a master and slave port

� Slave synchronizes to the master� Master of thon the highest level is the Grand Master Clock

Definition of the Hierarchy of the Clocks and SynchronizationPrecision Time Protocol (gPTP)

Master-Port

Slave-PortEthernet Link

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� Measurement of the delay on every Ethernet link

� Measure and balance time differences between Master and Slave

� Measure and balance clock speed between clocks

Achieve and Maintain a Common Time BasePrecision Time Protocol (gPTP)

Clock synchronized

Delay

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AVB/TSN IntroductionPrecision Time Protocol (gPTP)

� Stream Reservation Protocol (SRP)Transport Protocol (AVTP)Example

Agenda

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� Talker announces data streams within a AVB-domain� Listener signals when it would like to receive the data stream� Bridges provide the requested bandwidth

Tasks of SRPStream Reservation Protocol (SRP)

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AVB/TSN IntroductionPrecision Time Protocol (gPTP)Stream Reservation Protocol (SRP)

� Transport Protocol (AVTP)Example

Agenda

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AVTP Protocol DetailsTransport Protocol (AVTP)

ConnectionManagementACMP

EthernetEthernet

AVTPData Streams

Audio/VideoApplication

Entity ModelAEM

Enumeration& ControlAECP

DiscoveryADP

MAC AddressAcquisitionMAAP

AVDEC

AVTP Control Protocols

AVTPAudio/VideoStreaming

Daten

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AVB/TSN: Audio Streaming : AVBBasicAudioStreaming.cfg

TSN exampleExample

Talker :The node contains a sine tone generator with adjustable frequency. The tone is transmitted from the AVTP Talker end point as an AVB stream.

Listener : The node contains an AVTP Listener end point that receives the stream generated by the Talker and outputs it via the sound card.

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© 2018. Vector Informatik India Private Limited. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. V1.0 | 2019-07-09

Author:Laygude ,PrashantVector India

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