CN115834430A - Time sensitive network testing method, testing bed and storage medium - Google Patents

Abstract

The application discloses a time-sensitive network testing method, a testing bed and a storage medium, wherein the testing method comprises the following steps: the method comprises the steps that electric power service flow is sent to a TSN through an electric power information acquisition end, so that the TSN uploads the electric power service flow to an electric power information processing end, background flow is sent to the TSN through a network testing device, network congestion is generated on a transmission link of the TSN through the background flow, the service adaptation degree of the TSN under an electric power control service scene is determined according to the electric power service flow received by the electric power information processing end, application verification is carried out on service adaptation of the TSN technology in the electric power industry, the adaptability of electric power service with time synchronization, low time delay and jitter and the TSN technology is verified, and the instantaneity and the synchronism of an electric power communication network based on the TSN technology are tested.

Description

Time sensitive network testing method, testing bed and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a time-sensitive network testing method, a testing bed, and a storage medium.

Background

A Time-Sensitive Networking (TSN) technology is used as a new generation ethernet technology, and has an accurate traffic scheduling capability due to its standard ethernet architecture, so that it can ensure the high-quality transmission of multiple traffic flows in a common network and has the cost advantage, and is considered as one of the evolution directions of next generation network bearer technologies in multiple fields such as audio/video transmission, mobile bearer, and vehicle-mounted network.

The TSN realizes transmission of zero congestion packet loss through a series of protocol standards (IEEE 802.1Qbv, IEEE 802.1Qci, IEEE 802.1Qbu, etc.), provides low delay and jitter with upper bound guarantee, and provides deterministic transmission guarantee for delay sensitive traffic. At present, a time-sensitive network protocol cluster is basically complete, the technology tends to mature, and mainstream chip manufacturers, communication equipment manufacturers and automation manufacturers release time-sensitive network related products.

In the process of implementing the present application, the inventor finds that in the related art, a passive ethernet network or an industrial ethernet network is commonly used in a power communication access network, different networking devices use different communication modes, and control signal information sensitive to required time can only be connected during transmission, which results in high networking cost and serious resource waste. Meanwhile, communication is performed based on the industrial Ethernet, packet loss is easily caused when the network is congested, and reliability is poor.

It is noted that the information disclosed in this background section is only for background understanding of the concepts of the application and, therefore, it may contain information that does not form the prior art.

Disclosure of Invention

The first objective of the present application is to provide a time-sensitive network testing method, which is used for verifying the application of the TSN technology in the service adaptability of the power industry, verifying the adaptability of the power service with time synchronization, low delay and jitter and the TSN technology, and testing the real-time performance and the synchronization performance of the power communication network based on the TSN technology.

A second object of the present application is to propose a computer-readable storage medium.

A third object of the present application is to provide a time sensitive network test bed.

To achieve the above object, an embodiment of a first aspect of the present application provides a time-sensitive network testing method applied to a time-sensitive network testing bed, where the time-sensitive network testing bed includes: the method comprises the following steps that an electric power information acquisition end, a TSN switch, an electric power information processing end and a network testing device are sequentially connected, the network testing device is connected with the TSN switch, and the method comprises the following steps: sending power business flow to the TSN through the power information acquisition end so that the TSN can upload the power business flow to the power information processing end; sending background traffic to the TSN switch through the network test device, so that the background traffic generates network congestion on a transmission link of the TSN switch; and determining the service adaptation degree of the TSN switch in a power control service scene according to the power service flow received by the power information processing end.

According to the time-sensitive network testing method provided by the embodiment of the application, the TSN equipment, the TSN network, the TSN technology and the electric power application can be verified according to the electric power control service scene with harsh time synchronization and time delay requirements and high reliability by configuring the time-sensitive electric power service scene and the TSN network and combining a special testing instrument and a testing configuration end, so that the adaptability of the electric power service with time synchronization, low time delay and jitter and the adaptability of the TSN technology are obtained, and the instantaneity and the synchronism of the electric power communication network based on the TSN technology are tested, so that when a testing result is good, the scheduling communication delay of a power grid is improved through the TSN technology, the packet loss in the transmission process is avoided, the reliability of network transmission is increased, the scheduling capability is improved, the networking cost is reduced, the hardware resources are saved, and the flexibility of distributed TSN is improved while the multi-service load flow is borne.

According to an embodiment of the present application, before determining the service adaptation degree of the TSN switch in the power control service scenario according to the power traffic received by the power information processing end, the method further includes: and sending configuration information to the TSN through the electric power information processing terminal so that the TSN can send the configuration information to the electric power information acquisition terminal to configure the electric power information acquisition terminal.

According to an embodiment of the present application, determining a service adaptation degree of the TSN switch in a power control service scenario according to a power service traffic received by the power information processing end includes: and determining the transmission result of the configuration information according to the power service flow received by the power information processing end, and determining the service adaptation degree according to the transmission result.

According to an embodiment of the present application, the configuration information includes configuration information of a data upload trigger manner, and a transmission result of the configuration information includes: transmission success rate and transmission time.

According to an embodiment of the present application, the data upload trigger method includes: data value changes, data quality changes, data updates, and overall calls.

According to an embodiment of the present application, sending power traffic to the TSN switch through the power information collecting terminal includes: and correspondingly changing the data of the electric power information acquisition terminal according to the configuration information of the data uploading triggering mode so as to trigger the electric power information acquisition terminal to upload the electric power service flow.

According to an embodiment of the present application, the configuration information includes a terminal remote control instruction, where the terminal remote control instruction includes: terminal control command and instruction execution mode; the transmission result of the terminal remote control instruction comprises the following steps: transmission success rate and transmission time.

According to an embodiment of the application, the method further comprises: fault recording information is sent to the TSN through the electric power information acquisition end, so that the TSN can upload the fault recording information to the electric power information processing end; and analyzing the received fault recording information through the electric power information processing end, and generating the terminal remote control instruction according to an analysis result so as to trigger the issuing of the terminal remote control instruction.

According to an embodiment of the present application, before determining the service adaptation degree of the TSN switch in the power control service scenario according to the power traffic received by the power information processing end, the method further includes: and determining the transmission result of the fault recording information according to the fault recording information received by the electric power information processing end so as to determine the service adaptation degree according to the transmission result of the fault recording information when determining the service adaptation degree.

According to one embodiment of the application, the electric power information acquisition end and the electric power information processing end are communicated through a GOOSE protocol.

According to an embodiment of the present application, sending background traffic to the TSN switch through the network test device includes: and sending the background traffic to the TSN switch through a first port of the network testing device, and receiving the background traffic through a second port of the network testing device.

According to an embodiment of the present application, before determining the service adaptation degree of the TSN switch in the power control service scenario according to the power traffic received by the power information processing end, the method further includes: comparing the background flow sent by the first port with the background flow received by the second port to obtain a network test result of the TSN switch, so as to determine the service adaptation degree according to the network test result when determining the service adaptation degree.

To achieve the above object, a second aspect of the present application provides a computer-readable storage medium, on which a time-sensitive network test program is stored, and the time-sensitive network test program, when executed by a processor, implements the time-sensitive network test method in the above embodiments.

In order to achieve the above object, an embodiment of a third aspect of the present application provides a time-sensitive network test bed, including an electric power information acquisition end, a TSN switch, an electric power information processing end, and a network test device, where the electric power information acquisition end, the TSN switch, and the electric power information processing end are connected in sequence, and the network test device is connected to the TSN switch; the electric power information acquisition end is used for sending electric power business flow to the TSN switch so that the TSN switch can upload the electric power business flow to the electric power information processing end; the network testing device is used for sending background traffic to the TSN switch so that the background traffic generates network congestion on a transmission link of the TSN switch; and the electric power information processing terminal determines the service adaptation degree of the TSN switch in the electric power control service scene according to the received electric power service flow.

According to an embodiment of this application, the test bed includes at least two TSN switches, at least two TSN switches include first TSN switch and second TSN switch, electric power information acquisition end, first TSN switch, the second TSN switch with electric power information processing end connects gradually, the network test device respectively with first TSN switch with the second TSN switch is connected.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

Fig. 1 is a flowchart illustrating a time-sensitive network testing method according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a network architecture of a time-sensitive network test bed according to an embodiment of the present application.

FIG. 3 is a schematic diagram of a network architecture of a time-sensitive network test bed according to another embodiment of the present application.

FIG. 4 is a schematic diagram of a network architecture of a time-sensitive network test bed according to another embodiment of the present application.

Detailed Description

Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

The time-sensitive network test method, test bed and storage medium according to the embodiments of the present application are described below with reference to the accompanying drawings.

Referring to fig. 1, the time-sensitive network testing method in the embodiment of the present application includes the following steps 100 to 300.

S100, sending the power business flow to the TSN through the power information acquisition end so that the TSN uploads the power business flow to the power information processing end.

The time-sensitive network testing method of the embodiment is applied to a time-sensitive network testing bed, and referring to fig. 2, a network architecture schematic diagram of the testing bed includes: electric power information acquisition end 11, TSN switch A, electric power information processing end 12 and network test device 13, wherein, electric power information acquisition end 11, TSN switch A and electric power information processing end 12 connect gradually, and network test device 13 is connected with TSN switch A.

After the test bed is built, all the devices are powered on and started, and the computer can be connected to the TSN switch A in a serial port mode and controls the TSN switch A to enable and test related functions and protocols. Electric power information acquisition end 11 and electric power information processing end 12 are terminal equipment, and wherein, electric power information acquisition end 11 can carry out the collection of electric power business data, forms electric power business flow and sends to TSN switch A based on the information of gathering, and then uploads to electric power information processing end 12 through TSN switch A.

Because the existing ethernet transmission information is forwarded in the order of arrival in a best effort manner, the traffic arriving in the order cannot be transmitted in time when the background traffic reaches the line speed. The delay of each hop of the network can be divided into three parts of link propagation delay, switch processing delay and output port queuing delay, and the end-to-end delay is the sum of hop-by-hop delay. The link delay and the processing delay are basically fixed values, so that the queuing delay needs to be reduced when the delay is reduced, and the essence of the delay sensitive network is that no queuing is performed: the TSN network separates the delay sensitive streams from the best effort streams by priority queues and then separates the same delay sensitive streams either temporally (time slot division) or spatially (route planning). After the low delay is realized, the retention time of the data packet in the switch is very short, and the accumulation of the data packet cannot exceed the size of the queue buffer area, so that the zero packet loss rate is realized; meanwhile, the jitter is a variation difference value of the time delay, the worst time delay is reduced due to the low time delay, the upper time delay boundary is close to the lower time delay boundary, and the variation interval of the time delay is reduced, so that the low jitter is realized.

After receiving the power service traffic, the power information processing terminal 12 processes and responds to data content in the power service traffic, for example, the data content may be reading information of an electricity meter, the power information processing terminal 12 records the reading information, or the data content is device status information, the power information processing terminal 12 analyzes the device status information and generates a corresponding power distribution control instruction, forms the power service traffic based on the power distribution control instruction and sends the power service traffic to the TSN switch a, and then sends the power service traffic to the power information acquisition terminal 11 through the TSN switch a. It is understood that power service traffic is data generated in a power service scenario.

S200, sending background flow to the TSN through a network testing device, so that the background flow generates network congestion on a transmission link of the TSN.

Because there are high requirements for time synchronism, time delay, reliability and stability of data transmission in the power control service scene of the power industry, in order to test whether the transmission condition of the power service traffic can meet the requirements under the condition that network congestion occurs in the current service traffic transmission process, a network testing device 13 is arranged in the test bed, and the network testing device 13 is used for simulating the scene of network congestion.

Specifically, in the process of uploading the power service traffic to the power information processing end 12 by the power information collection end 11, the network test device 13 sends background traffic (shown by a dotted line in the figure) to the TSN switch a, and on a link of the TSN switch a, the power service traffic and the background traffic form a mixed traffic together, so as to simulate a state of network congestion on a transmission link. The background traffic is a data packet with a large flow rate, and is used to fill up the bandwidth of the transmission link of the TSN switch a, the background traffic may be set to the port linear speed of the 64-byte data packet, and the network test device 13 may continuously send the background traffic to the TSN switch a within a set time duration (for example, one minute).

S300, determining the service adaptation degree of the TSN switch in the power control service scene according to the power service flow received by the power information processing end.

The service adaptation degree refers to a degree that the TSN switch reaches a scene requirement when operating in a power control service scene, for example, whether the execution conditions of the data transmission function, the interface function and the forwarding function of the TSN switch meet the scene requirement in the power control service scene. The electric power service adaptability test mainly combines an electric power service and a TSN (transmission time network) to carry out a service transmission test, and comprises the tests of service information transmission function, performance, reliability and the like, and the services mainly comprise related services such as remote measurement, remote signaling, remote control service, distribution automation service, video monitoring service, security and protection system and the like.

The service adaptation degree can be obtained by analyzing the power service traffic received by the power information processing terminal 12, for example, the received power service traffic is analyzed to obtain indexes such as data accuracy, data integrity, data transmission rate, and the like, if all data packets sent by the power information acquisition terminal 11 are received by the power information processing terminal 12 under the condition of network congestion, the content of the data packets is not changed, and the time consumption of the transmission process is short, it indicates that the service adaptation degree of the TSN switch under the current power control service scenario is high, so the test result indicates that the TSN switch can meet the requirements of the current power control service scenario on the aspects such as data accuracy, data integrity, data transmission rate, and the like; if only a part of the data packets sent by the power information acquisition end 11 is received by the power information processing end 12 under the condition of network congestion, the content of the data packets changes due to transmission, and the time consumption of the transmission process is too long, it is indicated that the service adaptation degree of the TSN switch in the current power control service scenario is low, so the test result indicates that the TSN switch cannot meet the requirements of the current power control service scenario on data accuracy, data integrity, data transmission rate and the like.

It can be understood that for different network architectures and functional requirements, the power service scenarios are also different, and the time-sensitive network test may be performed again, for example, the test result in the power service scenario in fig. 1 is adapted, and for other scenarios where the working condition and architecture of fig. 1 are more complex, the TSN network needs to be re-established and retested to determine whether the TSN device can meet the new power service scenario requirement, where the test result in the power service scenario in fig. 1 is adapted and does not represent that the test results in all power service scenarios are adapted.

According to the time-sensitive network testing method provided by the embodiment of the application, the TSN equipment, the TSN network and the adaptability between the TSN technology and the power application can be verified aiming at the power control service scene with harsh time synchronization and time delay requirements and high reliability by configuring the time-sensitive power service scene and the TSN network and combining a special testing instrument and a testing configuration end, so that the adaptability between the power service with time synchronization, low time delay and jitter and the TSN technology can be obtained, the instantaneity and the synchronism of the power communication network based on the TSN technology can be tested, the scheduling communication delay of a power grid can be improved through the TSN technology, the scheduling capability can be improved, and the flexibility of distributed intelligent networking can be improved while the TSN bears the multi-service load flow.

In some embodiments, the manner of determining the service adaptation degree in step 300 may include: comparing the electric power service flow uploaded by the electric power information acquisition end with the electric power service flow received by the electric power information processing end, determining a test result of a preset index according to the comparison result, and determining the service adaptation degree according to the test result of the preset index. The preset indexes may include a packet loss rate, a delay, and a jitter amount.

Specifically, during the test, the power information collection end 11 may be configured in advance, so that the power information collection end 11 periodically uploads telemetry data or remote signaling data collected by the power information collection end 11 to the power information processing end 12 within a certain time period, for example, collected real-time level signals of a certain device, where the level signals form power service traffic, records and analyzes the power service traffic received by the power information processing end 12 and identifies level signal data uploaded by the power information collection end 11, and analyzes the data to obtain values, numbers, receiving times, receiving sequences, and the like of the level signal data, and then compares the values, numbers, sending times, sending sequences, and the like of the real-time level signals uploaded by the power information collection end 11 to obtain preset indexes such as packet loss rate, time delay, jitter, and the like, and since these indexes can reflect the situations such as data accuracy, data integrity, data transmission rate, and the like of power service traffic transmission according to the packet loss rate, service integrity, jitter degree, and the like.

The determination process of the test result of the preset index may specifically be: and calculating specific numerical values of each preset index, comparing the specific numerical values with corresponding preset threshold values respectively, determining the preset index as an index up to standard if the specific numerical values are not lower than the preset threshold values, and otherwise determining the preset index as an index not up to standard. The determining process of the service adaptation degree at this time may specifically be: when all the preset indexes are standard indexes, determining that the service adaptation degree is 'adaptation', namely the TSN switch can meet the service requirement under the current power control service scene; if one or more preset indexes are not up-to-standard indexes, the service adaptation degree is determined to be 'not adapted', namely the TSN switch cannot meet the service requirement under the current power control service scene.

In some embodiments, before determining the service adaptation degree of the TSN switch a in the power control service scenario according to the power service traffic received by the power information processing terminal 12, the configuration information may be sent to the TSN switch a through the power information processing terminal 12, so that the TSN switch issues the configuration information to the power information acquisition terminal 11, and configures the power information acquisition terminal 11.

The configuration information may be used to configure the operation mode of the power information collection terminal 11, and may also be used to configure the function of the power information collection terminal 11. For example, the power information collection terminal 11 is configured to collect data according to a set period, and whether the collected data changes or not, the collected data in the period is uploaded according to the set period; or the power information acquisition terminal 11 is configured to compare the data acquired last time after the data is acquired each time, and only when the data acquired this time is different from the data acquired last time, the data acquired this time is uploaded.

The configuration information may include: the method comprises the steps of remote measuring change source, remote measuring change threshold configuration mode, remote measuring change threshold criterion type, remote measuring change threshold value, remote measuring change sending strategy, remote step change sending strategy, COS sending strategy, SOE sending strategy, remote measuring change message organization scanning strategy, remote step change message organization scanning strategy, COS message organization scanning strategy, SOE message organization scanning strategy, remote signaling data source, remote control process overtime time, remote control correlation remote signaling locking configuration strategy, remote control correlation locking unified configuration remote signaling state, gear remote adjusting command execution mode, gear remote adjusting process overtime time, remote adjusting command execution mode, remote control closing mode strategy, process resetting operation strategy and the like.

The power information acquisition terminal 11 is configured in advance through the power information processing terminal 12, so that when the time-sensitive network test is performed, the mode of uploading the power service flow by the power information acquisition terminal 11 is the same as the mode required by the power information processing terminal 12, so that the test can be performed smoothly. Meanwhile, the power information processing terminal 12 may simulate different power control service sub-scenarios by sequentially issuing different configuration information, so as to perform more comprehensive testing, obtain index testing results under a plurality of different sub-scenarios, and perform comprehensive evaluation on the obtained index testing results, thereby obtaining a service adaptation degree. It can be understood that, during the transmission process of the configuration information and the service traffic, both the power information collection end 11 and the power information processing end 12 have interference of background traffic.

The comprehensive evaluation mode can be as follows: and if one or more preset indexes in the index test results under one or more sub-scenes are not up-to-standard indexes, determining that the service adaptation degree is not adapted.

The comprehensive evaluation mode can also be as follows: classifying power control service sub-scenes corresponding to various configuration information according to scene requirements, wherein the data transmission emphasis points under different sub-scenes are different, the scene requirements can be accurate in data transmission, efficient in data transmission and the like, then dividing preset indexes in the same class of sub-scenes according to the scene requirements of the class of sub-scenes to obtain indexes directly related to the scene requirements of the class of sub-scenes and indexes indirectly related to the scene requirements of the class of sub-scenes, and at the moment, if each index directly related to the scene requirements is a standard index, determining the service adaptation degree to be 'adaptation' no matter whether the indexes indirectly related to the scene requirements are standard or not; and if one or more indexes directly related to the scene requirement are not standard indexes, determining that the service adaptation degree is not adapted no matter whether the indexes indirectly related to the scene requirement are standard or not. Specifically, it is assumed that 5 different power control service sub-scenes are configured through 5 types of configuration information, where scene requirement X1 of 4 seed scenes is accurate data transmission, scene requirement X2 of 1 seed scene is efficient data transmission, and the preset indexes of each seed scene are packet loss rate, time delay and jitter amount, for 4 seed scenes of requirement X1, the packet loss rate and the jitter amount are indexes directly related to requirement X1, and for 1 seed scene of requirement X2, the time delay is an index directly related to requirement X2, and then index test results of 5 different power control service sub-scenes are obtained by sequentially issuing the 5 types of configuration information. And if the packet loss rate and the jitter amount in the index test result of the requirement X1 reach the standards and the time delay in the index test result of the requirement X2 reaches the standards, determining that the TSN switch A is adaptive under the full scene of the power control service, and otherwise determining that the TSN switch A is not adaptive under the full scene of the power control service.

In some embodiments, step 300 may specifically include: and determining a transmission result of the configuration information according to the power service flow received by the power information processing terminal 12, and determining a service adaptation degree according to the transmission result.

The power information processing terminal 12 issues the configuration information, and can also be used for testing the transmission of the configuration information, and the transmission result of the configuration information itself is used as a basis for determining the service adaptation degree. That is to say, in addition to determining the service adaptation degree according to whether the power information processing terminal 12 receives the power service traffic uploaded by the power information collection terminal 11 as expected as described above, the service adaptation degree may also be determined according to whether the power information collection terminal 11 receives the configuration information issued by the power information processing terminal 12 as expected.

Specifically, the determination manner of whether the power information collection end 11 receives the configuration information as expected may be determined by the power service traffic fed back by the power information collection end 11. For example, the configuration information CFG1 sent by the power information processing terminal 12 includes an instruction for doubling the feedback period for feeding back the telemetry data by the power information acquisition terminal 11, after receiving the configuration CFG1, the power information acquisition terminal 11 configures itself and uploads the traffic according to the doubled feedback period, and if the frequency of the power service traffic received by the power information processing terminal 12 is reduced by half, it indicates that the power information acquisition terminal 11 correctly receives the CFG1 sent by the power information processing terminal 12. When the electric power information acquisition end 11 uploads according to the modified feedback cycle for the first time, the uploaded electric power service traffic may include time T2 when the electric power information acquisition end 11 receives the configuration CFG1, at this time, the electric power service traffic received by the electric power information processing end 12 may be analyzed to obtain time T2, and the time T1 when the electric power information processing end 12 issues the configuration information is compared with the time T2 to obtain the transmission rate of the configuration information on the TSN link. Taking whether the power information acquisition end 11 correctly receives the CFG1 and the transmission rate as a transmission result, participating in determining the service adaptation degree, for example, when only the power information acquisition end 11 correctly receives the configuration information and all preset indexes (packet loss rate, time delay and jitter amount) of the power service flow uploaded after configuration according to the configuration information are standard indexes, determining that the service adaptation degree is "adapted", otherwise, determining that the service adaptation degree is "not adapted".

In some embodiments, the configuration information may include configuration information of a data upload trigger manner, and the transmission result of the configuration information includes: transmission success rate and transmission time.

The configuration information CFG2 sent by the power information processing terminal 12 to the TSN switch a may be a data upload trigger mode, where the data upload trigger mode refers to a trigger condition for the power information acquisition terminal 11 to upload power service traffic, and when the trigger condition is met, the power information acquisition terminal 11 uploads power service traffic, otherwise, the traffic is not uploaded.

The transmission result is obtained through the transmission success rate and the transmission time, after the power information processing terminal 12 issues the configuration CFG2 to modify the data uploading triggering mode of the power information acquisition terminal 11, the power information processing terminal 12 analyzes the received flow uploaded by the power information acquisition terminal 11, if the flow is analyzed or the uploading is triggered according to the data uploading triggering mode before modification is performed, the transmission success rate is 0, and if the flow is analyzed and the uploading is triggered according to the modified data uploading triggering mode, the transmission success rate is 1; at this time, the transmission time is obtained by comparing the time T1 when the power information processing terminal 12 issues the configuration CFG2 with the time T2 when the power information acquisition terminal 11 receives the configuration FG2 included in the power service traffic. Taking the transmission success rate and the transmission time as a transmission result, participating in the determination of the service adaptation degree, for example, determining that the service adaptation degree is "adapted" only when the transmission success rate of the data uploading trigger mode is 1, and all preset indexes (packet loss rate, time delay and jitter amount) of the uploaded power service flow after configuration according to the configuration CFG2 are standard indexes, and otherwise determining that the service adaptation degree is "not adapted".

In some embodiments, the data upload trigger manner includes: data value changes, data quality changes, data updates, and total calls.

Specifically, the data value change means that the value of the data item acquired by the power information acquisition end 11 this time is different from the value acquired last time, and the power information acquisition end 11 is triggered to upload data at different times; the data quality change means that the data quality of the data item acquired this time is different from the data quality of the data item acquired last time, and the power information acquisition terminal 11 is triggered to upload data at different times; the data updating means that when the numerical value of the data item is acquired, the data item is updated, and the power information acquisition terminal 11 is triggered to upload data after the data item is updated; the total call means that all the data items to be acquired of the power information acquisition terminal 11 are acquired once, and at this time, the power information acquisition terminal 11 is triggered to upload data. The above data upload trigger modes may be selectively programmed into the configuration information, and only one data upload trigger mode or multiple data upload trigger modes may be programmed simultaneously to configure the power information collection terminal 11.

In some embodiments, in step 100, the power service traffic is sent to the TSN switch a through the power information collection end 11, which may specifically be: and correspondingly changing the data of the power information acquisition terminal 11 according to the configuration information of the data uploading triggering mode so as to trigger the power information acquisition terminal 11 to upload the power service flow.

When testing, the power information acquisition end 11 may be connected to a real lower device, and testing may be performed through the acquired real telemetering telemetry remote signaling data, or more convenient testing may be performed by simulating the telemetering remote signaling data, that is, by generating simulated data changes on the power information acquisition end 11, a current data uploading trigger mode is manually satisfied, so that the power service traffic of the power information acquisition end 11 is uploaded. The power information collection terminal 11 itself may be used to generate the analog data change, or another device connected to the power information collection terminal 11 may be used.

Specifically, the power service power information processing terminal 12 sends configuration information to the TSN switch a first, so that the TSN switch a issues the configuration information to the power service power information acquisition terminal 11, and after receiving the configuration information, the power information acquisition terminal 11 changes a data uploading trigger mode of itself according to the configuration information, and can automatically trigger a simulated data change corresponding to a new data uploading trigger mode, so that after the change, the power information acquisition terminal 11 can be triggered at the highest speed to upload the changed data as power service traffic in the changed mode. In the process, the transmission result can be determined, the test result of the preset index can be determined, and the service adaptation degree determination with the configuration information and the remote control and remote measurement data as carriers is realized.

In some embodiments, the configuration information includes a terminal remote control command, and the transmission result of the terminal remote control command includes: transmission success rate and transmission time.

The configuration information CFG3 sent by the power information processing terminal 12 to the TSN switch a may be a terminal remote control instruction, which includes a terminal control command and an instruction execution mode. The terminal control command is used for remotely controlling and monitoring the controlled object, for example, the power information processing terminal 12 issues a terminal remote control command to the power information acquisition terminal 11, so that the power information acquisition terminal 11 performs a switching-on operation on a connected controllable switch. The instruction execution mode may be set to a direct execution mode or a selective execution mode, that is, a terminal control command may be directly executed or selectively executed.

The electric power information processing terminal 12 sends a terminal remote control instruction to the TSN switch a, so that after the TSN switch a issues the terminal remote control instruction to the electric power information acquisition terminal 11, the electric power information acquisition terminal 11 executes a write operation according to the terminal remote control instruction, and the terminal remote control instruction is enabled to take effect after being stored.

The transmission result of the terminal remote control instruction is obtained through the transmission success rate and the transmission time, after the power information processing terminal 12 issues the configuration CFG3 to execute the terminal remote control instruction of the power information acquisition terminal 11, the power information processing terminal 12 analyzes the received flow uploaded by the power information acquisition terminal 11, if the flow is analyzed to be performed according to the instruction in the configuration CFG3, the transmission success rate is 1, otherwise, the transmission success rate is 0; at this time, the transmission time is obtained by comparing the time T3 for the power information processing terminal 12 to issue the configuration CFG3 with the time T4 for the power information acquisition terminal 11 to receive the configuration CFG3, which is included in the power service traffic. Taking the transmission success rate and the transmission time as a transmission result, participating in the determination of the service adaptation degree, for example, determining that the service adaptation degree is "adapted" only when the transmission success rate is 1 and all preset indexes (packet loss rate, time delay and jitter amount) of the uploaded power service flow are standard indexes after being configured according to the configuration CFG3, and otherwise determining that the service adaptation degree is "unadapted".

It can be understood that, for the Remote control service, the configuration information may also include a preset configuration or a non-preset configuration, where the preset configuration is pre-configured as a dual-Terminal supervision, and when the Remote control preset operation is successfully completed and a permission command is obtained, an "execute" command may be sent to a Remote Terminal Unit (RTU) to perform a Remote control execution operation; and the non-preset configuration refers to configuration when a remote control operation is required, rather than configuration in advance.

The remote preset message may include the following fields: an application layer function code (03 represents preset), the number of remote control operations (0001 represents 1), a remote control number (0001 represents 1), a control code (41 represents on operation and 81 represents off operation), a counting code (the number of times of continuous execution of the remote control operations, and 01 represents 1), time-sharing and the like.

The remote preset response message may include the following fields: application layer function codes, remote control operation numbers, remote control numbers, control codes, property state bits and the like.

In some embodiments, the time sensitive network test method may further include the following steps B1 and B2.

And step B1, sending fault recording information to the TSN switch A through the electric power information acquisition terminal 11 so that the TSN switch A can upload the fault recording information to the electric power information processing terminal 12.

The fault recording information is used for recording waveforms and data before, when and after a fault occurs, the fault recorder can be used for starting to record waves when the fault occurs or oscillation occurs, and the conditions of voltage, current, power change, relay protection action and the like within a time period of hundreds of milliseconds before the fault and thousands of milliseconds after the fault can be recorded. The power information processing terminal 12 can be used as a power system scheduling master station to select and download the recording file sent by the power information acquisition terminal.

And step B2, analyzing the received fault recording information through the electric power information processing terminal 12, and generating a terminal remote control instruction according to an analysis result so as to trigger the issuing of the terminal remote control instruction.

When the power information acquisition end 11 encounters a fault, the fault recording information needs to be transmitted to the power information processing end 12 through the TSN switch a in a short time, and after receiving the fault recording information, the power information processing end 12 makes corresponding decisions by analyzing and processing the information, and then generates a remote control command and issues the command to the power information acquisition end 11 to process the fault.

In some embodiments, before determining the service adaptation degree of the TSN switch a in the power control service scenario according to the power service traffic received by the power information processing terminal 12, the transmission result of the fault recording information may be determined according to the fault recording information received by the power information processing terminal 12, so that when determining the service adaptation degree, the service adaptation degree may be determined according to the transmission result of the fault recording information.

Specifically, the transmission result of the fault recording information may also include: transmission success rate and transmission time. After the power information acquisition terminal 11 sends the fault recording information to the TSN switch a, so that the TSN switch a uploads the fault recording information to the power information processing terminal 12, the time when the power information processing terminal 12 receives the fault recording information is T6, the fault recording information may include the time T5 when the power information acquisition terminal 11 sends the information, and the power information processing terminal 12 obtains the transmission time of the fault recording information by comparing T5 with T6. Taking the transmission success rate and the transmission time as a transmission result, participating in the determination of the service adaptation degree, for example, determining that the service adaptation degree is 'adapted' only when the transmission success rates of the fault recording information and the terminal remote control instruction are both 1, and when all preset indexes (packet loss rate, time delay and jitter amount) of the electric power service flow uploaded after configuration according to the configuration CFG3 are standard indexes, and otherwise determining that the service adaptation degree is 'unadapted'.

In some embodiments, the power information collection end 11 and the power information processing end 12 communicate with each other through GOOSE protocol. GOOSE (Generic Object organized Substation Event) refers to a Generic Object Oriented Substation Event. The method is a rapid message transmission mechanism in IEC61850 and is used for transmitting important real-time signals in the transformer substation.

In some embodiments, referring to fig. 3, in step 200, sending the background traffic to the TSN switch a through the network testing device 13 may specifically be: the background traffic is sent to TSN switch a through a first port P1 of the network test device 13 and received through a second port P2 of the network test device 13.

The network test device 13 is usually provided with a plurality of ports, each of which corresponds to a terminal, that is, the network test device 13 is configured to send background traffic (shown by dotted lines) to itself, but specifically through a link of the TSN switch.

In some embodiments, before determining the service adaptation degree of the TSN switch a in the power control service scenario according to the power service traffic received by the power information processing end 12, the background traffic sent by the first port P1 may be compared with the background traffic received by the second port P2 to obtain a network test result of the TSN switch a, so that the service adaptation degree is determined according to the network test result when determining the service adaptation degree.

When the adaptability between the TSN switch and the power control service scene is determined, in addition to the fact that the transmission effect of the TSN switch as the transmission medium of the power service information is used as the basis for judging whether the adaptability exists, the performance test and the network test of the TSN switch can be used as the basis for judging whether the adaptability exists between the TSN switch and the power control service scene or not. Specifically, the network testing device 13 is kept sending the background traffic at least for a period of time, and the background traffic sent by the network testing device 13 is compared with the returned background traffic, and if the background traffic and the returned background traffic are the same, the network testing result reaches the standard.

It is understood that the testing of the TSN switch may further include: the method comprises the contents of function test, performance test, protocol consistency test, clock synchronization test, interconnection test, network reliability test and the like. The functional test refers to the test of items such as an interface function, a forwarding function, a service function, a management protocol, flow scheduling, an MAC address table, a VLAN (virtual local area network), port aggregation, port mirroring and the like; the performance test refers to the test of items such as throughput, forwarding rate, time delay, jitter, packet loss and the like; the protocol conformance test refers to the test of items such AS IEEE 802.1AS protocol conformance, IEEE 802.1Qbv protocol conformance, IEEE 802.1Qbu protocol conformance and the like; the clock synchronization test refers to the test of items such as clock source selection, a synchronization mechanism, time synchronization precision, scheduling precision and the like; the interconnection test refers to the interconnection test among different manufacturer devices; the network reliability test refers to the test of items such as continuous working time, fault repair time and the like of the composed TSN network. The results of the above tests can be selectively or totally used for comprehensively evaluating the service adaptation degree of the TSN switch in the power control service scenario.

In addition, an embodiment of the present application further provides a computer-readable storage medium, on which a time-sensitive network test program is stored, and when the time-sensitive network test program is executed by a processor, the time-sensitive network test method in the above embodiment is implemented.

According to the computer-readable storage medium provided by the embodiment of the application, a processor executes a time-sensitive network test program stored on the storage medium, and by configuring a time-sensitive power service scenario and a TSN network and combining a special test instrument and a test configuration end, the method can verify the adaptability between the TSN device, the TSN network, the TSN technology and the power application according to the power control service scenario with strict requirements on time synchronization, time delay and high reliability, so as to obtain the adaptability between the power service with time synchronization, low time delay and jitter and the TSN technology, and test the instantaneity and the synchronism of the power communication network based on the TSN technology, so that when a test result is good, the scheduling communication delay of a power grid is improved through the TSN technology, packet loss in the transmission process is avoided, the reliability of network transmission is increased, the scheduling capability is improved, the networking cost is reduced, hardware resources are saved, and the TSN is enabled to bear multi-service load flow, and the flexibility of distributed intelligent networking is improved.

In addition, referring to fig. 2, an embodiment of the present application further provides a time-sensitive network test bed, which includes an electric power information acquisition end 11, a TSN switch a, an electric power information processing end 12, and a network test device 13, where the electric power information acquisition end, the TSN switch, and the electric power information processing end are connected in sequence, and the network test device is connected to the TSN switch.

The power information collection end 11 is configured to send power service traffic to the TSN switch a, so that the TSN switch a uploads the power service traffic to the power information processing end 12. The network test device 13 is configured to send background traffic to the TSN switch a, so that the background traffic causes network congestion on a transmission link of the TSN switch a. The power information processing terminal 12 determines the service adaptation degree of the TSN switch a in the power control service scenario according to the received power service traffic.

According to the time-sensitive network test bed provided by the embodiment of the application, the TSN equipment, the TSN network, the TSN technology and the power application can be verified according to the power control service scene with strict time synchronization, delay requirement and high reliability by configuring the time-sensitive power service scene and the TSN network and combining the special test instrument and the test configuration end, so that the adaptability of the power service with time synchronization, low delay and jitter and the TSN technology can be obtained, the instantaneity and the synchronism of the power communication network based on the TSN technology can be tested, the power grid scheduling communication delay can be favorably improved through the TSN technology, the scheduling capability can be improved, and the flexibility of distributed intelligent networking can be improved while the TSN bears the multi-service load flow.

In some embodiments, the manner of determining the service adaptation degree by the power information processing end 12 may include: comparing the electric power service flow uploaded by the electric power information acquisition terminal 11 with the electric power service flow received by the electric power information processing terminal 12, determining a test result of a preset index according to the comparison result, and determining a service adaptation degree according to the test result of the preset index. The preset indexes may include a packet loss rate, a delay, and a jitter amount.

In some embodiments, before determining the service adaptation degree of the TSN switch a in the power control service scenario according to the received power service traffic, the power information processing terminal 12 sends configuration information to the TSN switch a through the power information processing terminal 12, so that the TSN switch a issues the configuration information to the power information acquisition terminal 11, and configures the power information acquisition terminal 11.

In some embodiments, the manner for determining the service adaptation degree of the TSN switch a in the power control service scenario by the power information processing terminal 12 may specifically include: the power information processing terminal 12 determines a transmission result of the configuration information according to the received power service traffic, and determines a service adaptation degree according to the transmission result.

In some embodiments, the configuration information includes configuration information of a data upload trigger manner, and the transmission result of the configuration information includes: transmission success rate and transmission time.

In some embodiments, the data upload trigger manner includes: data value changes, data quality changes, data updates, and total calls.

In some embodiments, the power information collection end 11 may send power traffic to the TSN switch a by: and correspondingly changing the data of the power information acquisition terminal 11 according to the configuration information of the data uploading triggering mode so as to trigger the power information acquisition terminal 11 to upload the power service flow.

In some embodiments, the configuration information comprises terminal remote control instructions, wherein the terminal remote control instructions comprise: terminal control command and instruction execution mode; the transmission result of the terminal remote control instruction comprises the following steps: transmission success rate and transmission time.

In some embodiments, the power information collection terminal 11 is further configured to send fault recording information to the TSN switch a, so that the TSN switch a uploads the fault recording information to the power information processing terminal 12, and the power information processing terminal 12 is further configured to analyze the received fault recording information and generate a terminal remote control instruction according to an analysis result, so as to trigger issuing of the terminal remote control instruction.

In some embodiments, before the power information processing terminal 12 determines the service adaptation degree of the TSN switch a in the power control service scenario according to the received power service traffic, the power information processing terminal 12 further determines the transmission result of the fault recording information according to the received fault recording information, so as to determine the service adaptation degree according to the transmission result of the fault recording information when determining the service adaptation degree.

In some embodiments, the power information collection end 11 and the power information processing end 12 communicate with each other through GOOSE protocol.

In some embodiments, referring to fig. 3, the network test device 13 sends background traffic to TSN switch a by: the background traffic is sent to TSN switch a through a first port P1 of the network test device 13 and received through a second port P2 of the network test device 13.

In some embodiments, before the power information processing terminal 12 determines the service adaptation degree of the TSN switch a in the power control service scenario according to the received power service traffic, the network testing device 13 compares the background traffic sent by the first port P1 with the background traffic received by the second port P2 to obtain a network testing result of the TSN switch a, so as to determine the service adaptation degree according to the network testing result when determining the service adaptation degree.

In some embodiments, referring to fig. 4, the test bed may include at least two TSN switches, for example, a first TSN switch (TSN switch a) and a second TSN switch (TSN switch B), the power information collecting terminal 11, the TSN switch a, the TSN switch B, and the power information processing terminal 12 are connected in sequence, and the TSN switch a and the TSN switch B together form a transmission link between the power information collecting terminal 11 and the power information processing terminal 12.

The network testing apparatus may include a network tester 41 and a tester controller 42, where the network tester 41 is connected to the TSN switch a and the TSN switch B, respectively, and the tester controller 42 is connected to the network tester 41 and configured to perform configuration of simulated background traffic on the network tester 41 and issue a configuration command to the network tester 41 to control the simulated background traffic at the port linear speed sent by the network tester 41.

The test bed can also comprise a video monitoring terminal 31 and a video monitor 32, wherein the video monitoring terminal 31, the TSN switch A, the TSN switch B and the video monitor 32 are sequentially connected to realize the transmission and the reception of video traffic. The video traffic belongs to one of the power traffic, when the power information collection end 11 and the video monitor terminal 31 send the power traffic to the TSN switch a, the network tester 41 also sends the background traffic (shown by a dotted line in the figure) to the TSN switch a, the power traffic and the background traffic form a mixed traffic (shown by a dashed line in the figure) at the TSN switch a, the TSN switch a forwards the mixed traffic to the TSN switch B, and the TSN switch B sends the background traffic therein to the network tester 41, because the background traffic is sent to itself by the network tester 41, only the transmission link between the TSN switches is passed, and meanwhile, the TSN switch B sends the power traffic therein to the power information processing end 12, and the video traffic therein is sent to the video monitor 32, thereby completing the traffic transmission under the condition of network congestion.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus, the electronic device, and the computer-readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to the partial description of the method embodiments for relevant points.

The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (15)

1. A time sensitive network test method is applied to a time sensitive network test bed, and the time sensitive network test bed comprises: the method comprises the following steps that an electric power information acquisition end, a TSN switch, an electric power information processing end and a network testing device are sequentially connected, the network testing device is connected with the TSN switch, and the method comprises the following steps:

sending power business flow to the TSN through the power information acquisition end so that the TSN can upload the power business flow to the power information processing end;

sending background traffic to the TSN switch through the network test device, so that the background traffic generates network congestion on a transmission link of the TSN switch;

and determining the service adaptation degree of the TSN switch in a power control service scene according to the power service flow received by the power information processing end.

2. The method of claim 1, wherein before determining the traffic adaptation degree of the TSN switch in a power control traffic scenario according to the power traffic received by the power information processing end, the method further comprises:

and sending configuration information to the TSN through the electric power information processing terminal so that the TSN can send the configuration information to the electric power information acquisition terminal to configure the electric power information acquisition terminal.

3. The method of claim 2, wherein determining the service adaptation degree of the TSN switch in a power control service scenario according to the power traffic received by the power information processing end comprises:

and determining the transmission result of the configuration information according to the power service flow received by the power information processing end, and determining the service adaptation degree according to the transmission result.

4. The method according to claim 3, wherein the configuration information includes configuration information of a data upload trigger mode, and a transmission result of the configuration information includes: transmission success rate and transmission time.

5. The method of claim 4, wherein the data upload trigger comprises: data value changes, data quality changes, data updates, and overall calls.

6. The method according to claim 4 or 5, wherein sending power traffic to the TSN switch through the power information collection end comprises:

and correspondingly changing the data of the electric power information acquisition terminal according to the configuration information of the data uploading triggering mode so as to trigger the electric power information acquisition terminal to upload the electric power service flow.

7. The method of claim 3, wherein the configuration information comprises a terminal remote control command, wherein the terminal remote control command comprises: terminal control command and instruction execution mode; the transmission result of the terminal remote control instruction comprises the following steps: transmission success rate and transmission time.

8. The method of claim 7, further comprising:

fault recording information is sent to the TSN through the electric power information acquisition end, so that the TSN can upload the fault recording information to the electric power information processing end;

and analyzing the received fault recording information through the electric power information processing end, and generating the terminal remote control instruction according to an analysis result so as to trigger the issuing of the terminal remote control instruction.

9. The method of claim 8, wherein before determining the traffic adaptation degree of the TSN switch in a power control traffic scenario according to the power traffic received by the power information processing end, the method further comprises:

and determining the transmission result of the fault recording information according to the fault recording information received by the electric power information processing end so as to determine the service adaptation degree according to the transmission result of the fault recording information when determining the service adaptation degree.

10. The method according to claim 1, wherein the power information acquisition end and the power information processing end communicate with each other through GOOSE protocol.

11. The method of claim 1, wherein sending background traffic to the TSN switch via the network test device comprises:

and sending the background traffic to the TSN switch through a first port of the network testing device, and receiving the background traffic through a second port of the network testing device.

12. The method of claim 11, wherein before determining the traffic adaptation degree of the TSN switch in a power control traffic scenario according to the power traffic received by the power information processing end, the method further comprises:

comparing the background flow sent by the first port with the background flow received by the second port to obtain a network test result of the TSN switch, so as to determine the service adaptation degree according to the network test result when determining the service adaptation degree.

13. A computer-readable storage medium having stored thereon a time sensitive network test program which, when executed by a processor, implements the time sensitive network test method of any of claims 1-12.

14. A time-sensitive network test bed is characterized by comprising an electric power information acquisition end, a TSN switch, an electric power information processing end and a network test device, wherein the electric power information acquisition end, the TSN switch and the electric power information processing end are sequentially connected, and the network test device is connected with the TSN switch; wherein,

the electric power information acquisition end is used for sending electric power business flow to the TSN switch so that the TSN switch can upload the electric power business flow to the electric power information processing end;

the network testing device is used for sending background traffic to the TSN switch so that the background traffic generates network congestion on a transmission link of the TSN switch;

and the electric power information processing end determines the service adaptation degree of the TSN switch in the electric power control service scene according to the received electric power service flow.

15. The time-sensitive network test bed according to claim 14, wherein the test bed includes at least two TSN switches, the at least two TSN switches include a first TSN switch and a second TSN switch, the power information collection terminal, the first TSN switch, the second TSN switch, and the power information processing terminal are sequentially connected, and the network test device is connected to the first TSN switch and the second TSN switch, respectively.

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