Hongke education you want to enter the field of TSN? Hongke teaches you how to build TSN test system

Time sensitive networks （TSN） It is responsible for the data link layer standard IEEE 802.1 The name of the task group , This technology aims to improve the performance of Ethernet , Make it more deterministic 、 Robustness 、 reliability . With TSN Technology in aerospace 、 automobile 、 There are more and more applications in rail transit and other fields , Many manufacturers in the industrial field have also begun to layout TSN Equipment R & D and manufacturing . Enter TSN What tools are needed in the field ？ How to validate TSN equipment ？ How to do TSN The network configuration ？ These problems are the problems that Hongke engineers once focused on , At the same time, Hongke customers are contacting TSN Technology must be considered .

2022 year 3 month 3 Japan -4 Japan , Hongke was invited to attend the third TSN Time sensitive network technology and Application Forum , And published on the theme of “ verification TSN And build TSN Testing tools — From the device side to the configuration tool ” Speech . The main content of this speech can be divided into the following three parts ：

Briefly introduce why TSN
TSN Test the capabilities that the system should have
How to build TSN Test environment

One 、 Why choose TSN?

at present ,TSN Technology is already in aerospace 、 automobile 、 Rail transit and other fields have been applied , But there is no large-scale promotion in industry , This is mainly because there are many specifications of fieldbus and industrial Ethernet protocols in the industrial field . If we develop more with the support of these bus manufacturers TSN Terminal equipment ,TSN Technology may become the core technology of the next generation industrial network . TSN Technology has unique advantages in the following network ：

The real time ：TSN Provide quality of service （QoS） Backbone network processing try traffic
Ethernet technology ：TSN Standards are based on the most widely used standards （EtherNET、5G）, It is part of the existing Ethernet technology ecosystem
Interoperability ： It is a combination of a series of protocol families , The implementation of consistency between devices makes it interoperable
Convergence network ： The fusion IT A single network of traffic and real-time traffic

Two 、 TSN Test the capabilities that the system should have

1. The test system should have TSN function
TSN The test system should support as many TSN function , Such as time synchronization 、 Time aware shaper 、 Credit based shaper 、 Frame preemption, etc , From the perspective of study or research , Such a test system is more acceptable .
2. The test system should include TSN equipment
TSN The test system should include at least the following three types of equipment ： Traditional Ethernet devices （ Do your best flow ）、TSN Endpoint （ Time critical traffic ） and TSN Switch （ Network backbone ）, These devices can meet the communication needs , And if you need to test and diagnose , Special TSN Testing tools , For example, Hongke can realize packet capture analysis and recording RELY-TSN-LAB Test tools and Hongke RELY-TSN-REC Recorder .
3. The test department should have CNC Configuration software
TSN Defines a specific standard （IEEE 802.1Qcc For configuration management ）, After preparing the above tools , We need to configure it . We can use the configuration tools of terminal devices , Such as web server And other tools to configure , But when there are multiple devices and multiple TSN When streams exchange data in the network , Individual configuration becomes very complicated . therefore ,TSN Test the network configuration tool in the system CNC A critical .

3、 ... and 、 Implementation process

According to the above summary, the implementation process is as follows ： First of all, we need to clarify and analyze TSN What are the traffic characteristics of the network , And what needs to be tested TSN What are the standards , Such as synchronization 、 Plastic surgery, etc ; then , Need basis TSN Flow characteristics and what you want to test TSN Prepare corresponding test tools and platform architecture for standards and functions , And configure the network .

Here are two test systems built by Hongke ：

Hongke test system I ：
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This test system consists of a flow generator （ Interference flow ）、TSN card （ Video streaming ）、TSN Switch （ Backbone network ） These three parts make up , among , Siphonaceae TSN Switches can be used to seamlessly implement deterministic Ethernet , Siphonaceae TSN The board can be connected PC As a terminal site , The traffic generator can be used to generate congestion traffic and then verify the device .
Time shaping and synchronization test example ：
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This part of the content intuitively shows the functions of part of our scheme —— Test of time synchronization function ：

1、 First start the flow generator , Capture data shows acceptance 100Mbps Of traffic , Traffic priority is 5;
2、 When starting Hongke RELY-TSN-PCIe In the board TAS（ Time perception shaping ） After the function , Only one time slot is reserved for priority 5 Traffic transmission , Allow all remaining traffic to be sent to the remaining time slots . Capture data again , Bandwidth has been reduced , This is due to priority only 5 A time slot is reserved for the traffic of ;
3、 When launching TAS（ Time perception shaping ） After the function , Similar to the previous step , Windows cannot be opened at the same time, so the bandwidth is reduced again ;
4、 After starting the synchronization function in the two devices , Both devices can open windows at the same time , After synchronization , The bandwidth returns to the previous level .

Hongke test system II ：
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This test system is relatively more complex , Include TSN card 、 Multiple ports TSN Switch 、TSN Test equipment and flow generator .

Hongke test platform architecture ：

In Hongke's test platform architecture , Devices in the network include terminal sites and TSN Switch , And the terminal site includes TSN Devices, cameras and other non best effort traffic TSN equipment . Network TSN The flow is mainly Talkers/sources、Listeners/destinations, these TSN Flow will pass TSN Switch .

Siphonaceae TSN Solution

In the above Hongke TSN In the device , The functions of each equipment are as follows ：

Siphonaceae RELY-TSN-LAB Testing tools ： Perform error injection , Delay and bandwidth measurement 、 Flow filtering and recording IEEE 802.1AS Network hardware and timestamp .

Siphonaceae RELY-TSN-REC Recorder ： Support simultaneous reading of industrial high-capacity solid-state drives / Write data operations ; Local storage can be accessed remotely , Generation and Wireshark Compatible standard file formats （PCAP）, be based on IEEE 802.1AS Synchronized traffic hardware timestamp , It can be done by IO Trigger
Siphonaceae RELY-TSN-PCIe card ： Connectable PC As a terminal site , And support in TSN Typical industrial applications and software are used in the network , Such as SCADA、MES、OPC（UA）、MTConnect etc. .

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