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IEEE 802.3 - PPT Presentation

Distinguished Minimum Latency Traffic Ludwig WINKEL Chair IEEE 8023 SG DMLT Siemens Presenter Marcel KIESSLING IEEE 8021 TSN WG Siemens Joint IEEESA and ITU Workshop on Ethernet 2 Geneva Switzerland 13 July 2013 ID: 321383

dmlt traffic july geneva traffic dmlt geneva july 2013 switzerland ieee 802 latency control ethernet network express effort mac

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Slide1

IEEE 802.3 Distinguished Minimum Latency Traffic

Ludwig WINKEL,Chair IEEE 802.3 SG DMLT,SiemensPresenter: Marcel KIESSLINGIEEE 802.1 TSN WG,Siemens

Joint IEEE-SA and ITU Workshop on EthernetSlide2

2

Geneva, Switzerland, 13 July 20132Reflector and Web site

Study Group reflector

stds-802-3-DMLT@listserv.ieee.org

To subscribe to the DMLT-reflector, send an email to:

ListServ@ieee.org

with the following in the body of the message (do not include “<>”):

subscribe stds-802-3-DMLT <yourfirstname> <yourlastname>

Study Group web page URL:

http://www.ieee802.org/3/DMLTSlide3

3

Scope: The scope of this project is to specify additions to and appropriate modifications of IEEE Std 802.3 to add a support for interspersed express traffic.

3

Draft PAR (P802.3br)

title & scope

Geneva, Switzerland, 13 July 2013Slide4

4

4Draft PAR (P802.3br) title & scopeSG DMLT proposes a PAR title:

IEEE Standard for Ethernet

Amendment Specification and Management Parameters for

Interspersing Express Traffic

.

Geneva, Switzerland, 13 July 2013Slide5

5

AbstractThere is a need for support of time sensitive traffic in a converged traffic environment in IEEE 802.3 networks that supports interspersed express traffic and the traditional normal traffic. This would help address the requirements in markets such as industrial and automotive control networking, where control data is time-sensitive and often requires minimum latency. This workshop presentation will examine the needs of time sensitive traffic in IEEE 802.3 networks, the support for interspersed express traffic and the ordinary traffic, and will provide background for the PAR proposed by the IEEE 802.3 Distinguished Minimum Latency Traffic (DMLT) Study Group.

5

Geneva, Switzerland, 13 July 2013Slide6

6

Market needs and market potentialSpecific to automotive environmentStreaming, Data, Control, over single LAN segment that supports, infotainment, driver assist and diagnostics within various functional LAN segments within a vehicular network. Control systems require lower-latency bridged networks for this convergence.

6

Geneva, Switzerland, 13 July 2013Slide7

7

Market needs and market potentialSpecific to Industrial automationLow Latency Sampling Data, (closed loop) Control, Image streaming (e.g. image processing) and data traffic, sampling data and closed loop control traffic have very demanding latency requirements.

Image streaming and associated processing as a part of a control loop has greater requirements than best effort could provide in a converged network. Best effort traffic is not time-critical, but provides a constant source for interference traffic.

7

Geneva, Switzerland, 13 July 2013Slide8

8

8Ethernet captures more and more Applications

Traditional Markets

Industrial Automation

Factory Automation

e.g. Material handling, Automotive Manufacturing, Transfer lines,

Process Automation

e.g. Oil, Gas, Chemical / Petrochemical, Food & Beverage

Energy Automation

Power Generation

e.g. Fossil Power Plants, Wind Turbines

Power Transmission and Distribution

e. g. Smart Grid Application

Building Automation

Climate Control

Fire Safety

New Markets

Avionics

Fly-by-Wire

Railway Systems

Train Control

Railway Traffic Management Systems

Medical

Patient Imaging,

Geneva, Switzerland, 13 July 2013Slide9

9

A bit of History of Industrial Automation1990 to 2000: Non-ETHERNET Solutions dominated the marketPROFIBUS,

INTERbus

,

ControlNet

,

DeviceNet

, ..

Since 2000 Ethernet based solutions enter the industrial market

Up to now Ethernet offers not the required real time capabilities (

QoS

) therefore specific Ethernet solutions appeared on the market, like:

CiP

,

EtherCAT

, Ethernet

Powerlink

,

TCnet

, PROFINET, ...

All these solutions contain

specific

additions or adjustments to the "standard ETHERNET" in order to provide the required real time capabilities (

QoS

) for industrial applications.

C

ustomers

ask for

one

IEEE 802.1/.3 standard based

solution

9

Geneva, Switzerland, 13 July 2013Slide10

10

10Required: Converged Traffic Environment

Customers ask for a solution which:

guarantees minimum latency for

Scheduled Traffic

and

provides guaranteed bandwidth for

Reserved Traffic

and

still allows the transfer of

Best Effort Traffic

on one single network

Geneva, Switzerland, 13 July 2013Slide11

11

11Overview of Industrial Communication Requirements

Best Effort Traffic

Configuration, Online Parameterization, Web Services, Events, IT-Communication

Reserved Traffic

Real Time Diagnostic like inspection, identification, tracking, counting and measurement

Scheduled Traffic

Cyclic exchange of process values

Profile specific data (Safety profile, Drive profile, ...)

Best Effort Traffic:

Reserved Traffic:

Scheduled Traffic:

Future: Only one Network:

No guaranteed bandwidth

Separate network

Dedicated solutions to guarantee minimum latency, resources and bandwidth and often a separate network for the Best Effort Traffic is necessary

Guaranteed bandwidth for Best Effort Traffic

Guaranteed QoS for Reserved Traffic

Standardized solution to guarantee minimum latency, resources and bandwidth for Scheduled Traffic

Today

Geneva, Switzerland, 13 July 2013Slide12

12

Why one single Network for all Communication ServicesOnly one network means:

Reduced possibility of network failures

wire breaks, reduced confusion in case of maintenance

Reduced installation costs

less cables, less connectors, less installation efforts as in the industrial area "field preparation on site" is common sense

Enables smaller devices

reduced space for connectors, lower power consumption (only 1 or 2 PHYs instead of 2 respectively 4 PHYs)

Reduced maintenance costs

easier to understand and to maintain

Only one interface in the devices

only one MAC address, only one IP address, easier to understand and to maintain, easier coordination of the communication relations in the stack and application layer in the devices

12

Geneva, Switzerland, 13 July 2013Slide13

13

The 24 ruleIf express/interspersed traffic is used, the guard band gets much smaller.

margin

guard band

part 2

1

margin

whole frame

guard band

Geneva, Switzerland, 13 July 2013Slide14

14

A Potential ArchitectureMAC Merge sublayer Provides lower latency for express trafficPreserves frame integrityMinimizes impact on throughputIs transparent to existing non-deprecated PHYs above 10 Mb/sDoesn’t change MAC operation

Queuing Frames

Transmission Selection

Transmission Selection

MAC Control

MAC Merge

Sublayer

PHY (unaware of preemption)

Express MAC

MAC

Geneva, Switzerland, 13 July 2013Slide15

15

DMLT negotiation

Negotiation Initiator

Link Partner

Normal Mode

Normal Mode

DMLT Request

Request Mode

DMLT Request

DMLT Xmit Mode

DMLT Accept

DMLT Accept

DMLT Request

DMLT Accept

DMLT Accept

Operational Mode

Frame without DMLT encap

Frame with DMLT encap

DMLT Accept

DMLT Accept

Operational Mode

Geneva, Switzerland, 13 July 2013Slide16

16

THANK YOU

for your attention

16

Geneva, Switzerland, 13 July 2013