CN106850331B - Ethernet frame sending device with synchronous clock function in traffic field - Google Patents
Ethernet frame sending device with synchronous clock function in traffic field Download PDFInfo
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 80
- 238000007493 shaping process Methods 0.000 claims abstract description 57
- 238000003860 storage Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 32
- 238000009432 framing Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
Abstract
The invention discloses an Ethernet frame sending device with a synchronous clock function, which comprises: the frame sending device and the shaping device are connected through a network cable, wherein a sending interface of the frame sending device is connected with a receiving port of the shaping device; the method is characterized in that: the shaping device comprises a receiving port, a sending port, a receiving schedule storage structure, a sending schedule storage structure, a receiving engine, a sending engine, a priority arbitration structure, an upper computer adapter, a real-time data cache region, a clock synchronization control structure, a data transmission structure and a schedule control engine. The invention realizes the precise clock synchronization with the system equipment through the time synchronization module, thereby realizing the requirement of sending frames by the synchronous clock. The module for processing the real-time data is completed through the real-time scheduling engine, so that the transmission delay can be effectively reduced, the jitter can be reduced, and the certainty of transmission can be increased.
Description
Technical Field
The invention relates to a device for sending frames by Ethernet, in particular to a device for sending frames by Ethernet with a clock synchronization function, which is used for industrial Ethernet.
Technical Field
The industrial Ethernet is a powerful area and unit network based on IEEE 802.3, has high communication speed, wide application, low development and production cost and easy integration, can complete the transmission of control data and information data in a control system, and is widely applied to various fields of aviation, railway traffic, industrial manufacturing and the like.
Time synchronization and time-based scheduling are one means to implement industrial ethernet, where real-time ethernet switches are the key to implementing real-time ethernet. The clock synchronization means that all devices in the industrial Ethernet system are precisely synchronized, and the time error between any two devices is not more than a determined value, so that the data transmission delay and jitter in the Ethernet are ensured to be small enough in real time.
In order to ensure that the industrial real-time ethernet using the principle of time synchronization and time-based scheduling can work normally, strict testing is required for the correctness of the scheduling engine of the real-time ethernet switch.
Domestic ethernet framing devices have mainly focused on testing conventional ethernet. The clock synchronization of the whole test system can not be realized by sending the time system frame in the test process, and the data frame can not be sent in a targeted manner at a precise time point in parallel by multiple ports according to a given test scene. Therefore, a real-time ethernet detection device with an ethernet framing apparatus having a synchronous clock function is urgently needed.
Fourth, the invention
The invention designs an Ethernet frame sending device with a synchronous clock, which is used for solving the problems.
In order to achieve the purpose, the technical scheme of the invention is as follows: an Ethernet frame sending device with a synchronous clock function comprises: the frame sending device and the shaping device, wherein the sending interface of the frame sending device is connected with the receiving port of the shaping device through a network cable, and the frame sending device is characterized in that:
the shaping equipment comprises a receiving port, a sending port, a receiving schedule storage structure, a sending schedule storage structure, a receiving engine, a sending engine, a priority arbitration structure, an upper computer adapter, a real-time data cache region, a clock synchronization control structure, a data transmission structure and a schedule control engine, wherein:
the receiving interface is used for receiving the data frame sent by the frame receiving equipment and covering a time stamp on the data frame;
the transmission interface is used for transmitting a data frame at a specified time;
the receiving schedule storage structure is used for storing the schedule of the port receiving data frames;
the receiving engine is used for acquiring the receiving window opening time, the receiving window closing time, the real-time data frame number, the data frame length, the real-time data cache region number and the receiving window opening time of the next item of the current real-time data from the receiving scheduling table storage; matching the time window, the real-time data frame number and the data frame length in the scheduling table according to the time stamp on the data frame and the content of the data frame, if the time window, the real-time data frame number and the data frame length are successful, transmitting the real-time data to a cache region corresponding to the scheduling table, and otherwise, discarding the frame;
the transmission schedule storage structure is used for storing a schedule of the port for transmitting the data frame;
the transmission engine is used for transmitting the real-time data from the real-time data buffer area at the transmission time point in the scheduling table and reporting the next real-time data transmission time point to the priority arbitration structure;
the priority arbitration structure adopts a pre-calculation mode to ensure the timely transmission of real-time data frames and receives the transmission time of the next data frame from a transmission engine, thereby coordinating clock synchronization frames and data frames;
the upper computer adapter is used for controlling the exchange of data between the shaping equipment and the upper computer;
the real-time data buffer area is used for storing data frames;
the clock synchronization control structure is used for periodically sending clock synchronization frames to realize the time synchronization of the frame sending equipment and the whole test system;
the data transmission structure is used for rapidly exchanging data;
the scheduling table control engine is used for completing the downloading function of the scheduling table, receiving and commanding the scheduling table control engine to write the contents of the scheduling table into the transmission scheduling table storage and the transmission scheduling table storage one by one, and returning the command execution result to the upper computer.
Further, the real-time data frame includes a real-time data frame number, a frame type, and frame content information.
Further, the receiving scheduling table comprises the opening and closing time of the receiving window of each real-time data frame, the real-time data frame number, the real-time data buffer area number and the frame length information.
Further, the transmission scheduling table mainly includes information such as a transmission time point, a real-time data frame number, a real-time data buffer region number, and a frame length of each real-time data frame.
Further, the scheduling table control engine completes downloading of the scheduling table in the initial stage of the shaping equipment; the frame sending device sends the generated data frame to the shaping device through a network cable, a receiving port of the shaping device supervises the input of the data frame at any time, a receiving engine checks the received data frame with information in a storage structure of a receiving scheduling table, and the correctly checked data frame is transmitted to a corresponding real-time data cache region through a data transmission structure; the upper computer adapter controls information exchange between the shaping equipment and the upper computer in the operation process of the shaping equipment; the transmission engine polls a storage structure of a transmission schedule table, extracts data frames reaching the transmission time from a real-time data cache region specified by the schedule table and transmits the data frames through a transmission port, and simultaneously transmits the transmission time of the next schedule table to a priority arbitration structure to ensure the preferential transmission of the real-time data frames; the clock synchronization control structure controls the clock synchronization of all the transmitting engines, the transmitting schedule storage structure, the transmitting ports and the priority arbitration structure in a timing transmitting time frame mode.
The invention also provides a working method of the Ethernet frame sending device with the synchronous clock function, which is characterized by comprising the following steps:
step 1, configuring and generating data frame
Firstly, designing a required data frame according to different test requirements, completing the related configuration of a data stream of a frame sending device, and simultaneously completing a receiving scheduling table and a sending scheduling table of shaping equipment according to the requirements and basic elements of the scheduling table, so that the shaping equipment can work according to the specified requirements;
step 2, the shaping equipment downloads the sending and receiving dispatch table
After receiving a receiving and sending scheduling table sent by an upper computer, an upper computer adapter downloads the receiving and sending scheduling table into a receiving scheduling table storage structure of a receiving port and a sending scheduling table storage structure of a sending port in a shaping device through a scheduling table control engine;
step 3, connecting the test equipment
Connecting the frame sending device, the shaping equipment and the equipment to be tested by using a network cable according to the test requirement and the design of the scheduling table;
step 4, sending the test data to finish the test
After the preparation work is finished, the frame sending equipment is controlled to send frames, and the shaping equipment receives the data frames and stores and forwards the data frames according to the setting of the scheduling table, so that the sent data frames can meet the test requirements.
The invention has the beneficial effects that:
the time synchronization module realizes the precise clock synchronization with the system equipment, thereby realizing the requirement of sending frames by the synchronous clock. The module for processing the real-time data is completed through the real-time scheduling engine, so that the transmission delay can be effectively reduced, the jitter can be reduced, and the certainty of transmission can be increased.
Drawings
FIG. 1 is a schematic diagram of a real-time Ethernet test equipment test with synchronous clock function;
fig. 2 is a general configuration diagram of an ethernet framing apparatus.
Sixth, detailed description of the invention
The technical solution of the present invention is further described in detail below with reference to the accompanying fig. 1-2.
Fig. 1 is a schematic diagram of a real-time testing device with a synchronous clock function using ethernet, in which an IXIA device is a frame sending device, and the frame sending device, a shaping device, and a device under test are connected through a network cable. And when the shaping device sends the frame, the system frame realizes the synchronization of the whole system, receives the data frame sent by the frame sending device and sends the test data frame to the tested device from the specified port at the specific time point according to the specific test scene.
As shown in fig. 2, the ethernet frame sending apparatus with synchronous clock function according to the present invention includes: a framing device and a shaping device, wherein: the sending interface of the frame sending equipment is connected with the receiving port of the shaping equipment through a network cable;
the shaping equipment comprises a receiving port, a sending port, a receiving schedule storage structure, a sending schedule storage structure, a receiving engine, a sending engine, a priority arbitration structure, an upper computer adapter, a real-time data cache region, a clock synchronization control structure, a data transmission structure and a schedule control engine;
wherein the function of each hardware structure is as follows:
receiving an interface: receiving a data frame sent by the frame sending and receiving equipment, and covering a time stamp on the data frame;
a sending interface: transmitting a data frame at a prescribed time;
reception schedule storage structure: storing a schedule of data frames received by the port;
a receiving engine: acquiring the receiving window opening time (receive _ start), the receiving window closing time (receive _ end), the real-time data frame number (flow _ id), the data frame length (length), the real-time data buffer area number (buffer _ id) and the receiving window opening time (receive _ start) of the next item of the current real-time data from a receiving schedule table storage; matching with a time window, a real-time data frame number (flow _ id) and a data frame length (length) in a scheduling table according to the time stamp on the data frame and the content of the data frame, if the matching is successful, transmitting the real-time data to a cache region corresponding to the scheduling table, otherwise, discarding the frame;
transmission schedule storage structure: storing a schedule of data frames sent by the port;
a sending engine: the module sends the real-time data out of the real-time data cache region according to the sending time point in the scheduling table and reports the next real-time data sending time point to the priority arbitration module;
priority arbitration structure: the module adopts a pre-calculation mode to ensure the timely transmission of a real-time data frame and receives the transmission time of the next data frame from a transmission engine, thereby coordinating a clock synchronization frame and the data frame;
host computer adapter: controlling the exchange of data between the shaping equipment and the upper computer;
a real-time data cache region: storing the data frame;
the clock synchronization control structure: the clock synchronization frame is periodically sent, so that the time synchronization of the frame sending equipment and the whole test system is realized;
data transfer structure: a rapid data exchange function;
the schedule control engine: the downloading function of the schedule table is completed. It receives and orders the contents of the schedule to write them item by item into the transmission schedule storage and the transmission schedule storage, and returns the order execution result to the upper computer.
The real-time data frame mainly comprises elements such as a real-time data frame number, a frame type, frame content and the like;
the receiving scheduling table mainly comprises the opening and closing time of a receiving window of each real-time data frame, the number of the real-time data frame, the number of a real-time data buffer area, the frame length and other information;
the transmission scheduling table mainly comprises information such as the transmission time point, the real-time data frame number, the real-time data buffer area number and the frame length of each real-time data frame;
the time frame comprises time stamp, message interval and other elements, so that the shaped frame sending device can perform clock synchronization with the tested equipment.
The logical relationship between the various hardware modules is further described:
the scheduling table control engine finishes downloading the scheduling table at the initial stage of the shaping equipment;
the frame sending device sends the generated data frame to the shaping device through a network cable, a receiving port of the shaping device supervises the input of the data frame at any time, a receiving engine checks the received data frame with information in a storage structure of a receiving scheduling table, and the correctly checked data frame is transmitted to a corresponding real-time data cache region through a data transmission structure;
the upper computer adapter controls information exchange between the shaping equipment and the upper computer in the operation process of the shaping equipment; the transmission engine polls a storage structure of a transmission schedule table, extracts data frames reaching the transmission time from a real-time data cache region specified by the schedule table and transmits the data frames through a transmission port, and simultaneously transmits the transmission time of the next schedule table to a priority arbitration structure to ensure the preferential transmission of the real-time data frames;
the clock synchronization control structure controls the clock synchronization of all the transmitting engines, the transmitting schedule storage structure, the transmitting ports and the priority arbitration structure in a timing transmitting time frame mode.
The working method of the present invention is further explained below:
step 1, configuring and generating data frame
Firstly, according to different test requirements, a required data frame is designed, and related configuration of data streams of a frame sending device is completed, wherein the related configuration comprises elements such as a frame type, a real-time data frame number, a frame length, a frame sending rate and the like. Meanwhile, a receiving scheduling table and a sending scheduling table of the shaping equipment are completed according to the requirements and the basic elements of the scheduling table, so that the shaping equipment can work according to the specified requirements;
step 2, the shaping equipment downloads the sending and receiving dispatch table
After receiving a receiving and sending scheduling table sent by an upper computer, an upper computer adapter downloads the receiving and sending scheduling table into a receiving scheduling table storage structure of a receiving port and a sending scheduling table storage structure of a sending port in a shaping device through a scheduling table control engine;
step 3, connecting the test equipment
Connecting the frame sending device, the shaping equipment and the equipment to be tested by using a network cable according to the test requirement and the design of the scheduling table;
step 4, sending the test data to finish the test
After the preparation work is finished, the frame sending equipment is controlled to send frames, and the shaping equipment receives the data frames and stores and forwards the data frames according to the setting of the scheduling table, so that the sent data frames can meet the test requirements.
Detailed description of the operation steps for the shaping device:
receiving a data frame:
1. the shaping device receives the data frames sent by the frame sending device through the receiving port, and the receiving structure covers a time stamp on each data frame;
2. for each received data frame, the shaper performs the following processing:
and aiming at the real-time data frame number, the receiving engine searches a corresponding scheduling table item in a storage structure of a receiving scheduling table and judges whether the data frame arrives in a specified receiving time window or not according to the timestamp. If the data frame passes the verification, setting a data transmission structure according to the real-time data cache region number in the scheduling table entry, and enabling the data frame to flow to the specified real-time data cache region.
And sending a data frame:
1. each transmission port transmission engine module polls all schedule entries of the transmission schedules in the transmission schedule storage structure;
2. if the item sending time of a certain scheduling table is reached, the sending engine sets a data transmission structure to read a data frame from a real-time data cache region appointed by the item, and if the real-time data cache region has the data frame, the data frame is read and sent out through a sending port; if there is no valid data, no operation is done. Multiple sending ports of the shaping equipment can realize that multiple ports send data frames in parallel according to accurate time points;
3. the transmission engine prefetches the next schedule entry while polling the transmission schedule storage structure and informs the priority arbitration structure of the next transmission time point, so that the priority arbitration structure can perform precalculation to ensure timely transmission of real-time frames.
Clock synchronization:
the shaping device can periodically send the clock synchronization frame through the clock synchronization control structure so as to ensure that the frame sending device can accurately time the whole tested device.
While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details of the embodiments are not to be interpreted as limiting the scope of the invention, and any obvious changes, such as equivalent alterations, simple substitutions and the like, based on the technical solution of the invention, can be interpreted without departing from the spirit and scope of the invention.
Claims (4)
1. An Ethernet frame sending device with synchronous clock function in traffic field comprises: the frame sending device and the shaping device, wherein the sending interface of the frame sending device is connected with the receiving port of the shaping device through a network cable, and the frame sending device is characterized in that:
the shaping equipment comprises a receiving port, a sending port, a receiving schedule storage structure, a sending schedule storage structure, a receiving engine, a sending engine, a priority arbitration structure, an upper computer adapter, a real-time data cache region, a clock synchronization control structure, a data transmission structure and a schedule control engine, wherein:
the receiving interface is used for receiving the data frame sent by the frame receiving equipment and covering a time stamp on the data frame;
the transmission interface is used for transmitting a data frame at a specified time;
the receiving schedule storage structure is used for storing a receiving schedule of a data frame received by the port;
the receiving engine is used for acquiring the receiving window opening time, the receiving window closing time, the real-time data frame number, the data frame length, the real-time data cache region number and the receiving window opening time of the next item of the current real-time data from the receiving scheduling table storage; matching the time window, the real-time data frame number and the data frame length in the scheduling table according to the time stamp on the data frame and the content of the data frame, if the time window, the real-time data frame number and the data frame length are successful, transmitting the real-time data to a cache region corresponding to the scheduling table, and otherwise, discarding the frame;
the transmission schedule storage structure is used for storing a transmission schedule of the port for transmitting the data frame;
the transmission engine is used for transmitting the real-time data from the real-time data buffer area at the transmission time point in the scheduling table and reporting the next real-time data transmission time point to the priority arbitration structure;
the priority arbitration structure adopts a pre-calculation mode to ensure the timely transmission of real-time data frames and receives the transmission time of the next data frame from a transmission engine, thereby coordinating clock synchronization frames and data frames;
the upper computer adapter is used for controlling the exchange of data between the shaping equipment and the upper computer;
the real-time data buffer area is used for storing data frames;
the clock synchronization control structure is used for periodically sending clock synchronization frames to realize the time synchronization of the frame sending equipment and the whole test system;
the data transmission structure is used for rapidly exchanging data;
the scheduling table control engine is used for completing the downloading functions of a receiving scheduling table and a sending scheduling table, receiving and commanding by the scheduling table control engine, writing the contents of the receiving scheduling table and the sending scheduling table into a receiving scheduling table storage structure and a sending scheduling table storage structure one by one, and returning the command execution result to the upper computer;
the real-time data frame comprises a real-time data frame number, a frame type and frame content information; the scheduling table control engine finishes downloading the scheduling table at the initial stage of the shaping equipment; the frame sending device sends the generated data frame to the shaping device through a network cable, a receiving port of the shaping device supervises the input of the data frame at any time, a receiving engine checks the received data frame with information in a storage structure of a receiving scheduling table, and the correctly checked data frame is transmitted to a corresponding real-time data cache region through a data transmission structure; the upper computer adapter controls information exchange between the shaping equipment and the upper computer in the operation process of the shaping equipment; the transmission engine polls a storage structure of a transmission schedule table, extracts data frames reaching the transmission time from a real-time data cache region specified by the schedule table and transmits the data frames through a transmission port, and simultaneously transmits the transmission time of the next schedule table to a priority arbitration structure to ensure the preferential transmission of the real-time data frames; the clock synchronization control structure controls the clock synchronization of all the transmitting engines, the transmitting schedule storage structure, the transmitting ports and the priority arbitration structure in a timing transmitting time frame mode.
2. The Ethernet framing device with synchronous clock function in traffic area of claim 1, wherein: the receiving scheduling table comprises the opening and closing time of a receiving window of each real-time data frame, the number of the real-time data frame, the number of a real-time data buffer area and the frame length information.
3. The Ethernet framing device with synchronous clock function in traffic area of claim 1, wherein: the transmission scheduling table includes a transmission time point of each real-time data frame, a real-time data frame number, a real-time data buffer region number, and frame length information.
4. The method of claim 1, further comprising the steps of:
step 1, configuring and generating data frame
Firstly, designing a required data frame according to different test requirements, completing the related configuration of a data stream of a frame sending device, and simultaneously completing a receiving scheduling table and a sending scheduling table of shaping equipment according to the requirements and basic elements of the scheduling table, so that the shaping equipment can work according to the specified requirements;
step 2, after the shaping equipment downloads a sending schedule and a receiving schedule and the sending schedule which are sent by the upper computer are received by the upper computer adapter, the receiving schedule and the sending schedule are downloaded to a receiving schedule storage structure of a receiving port and a sending schedule storage structure of a sending port in the shaping equipment through a schedule control engine;
step 3, connecting the test equipment
According to the test requirement and the design of a sending scheduling table and a receiving scheduling table, connecting the frame sending equipment, the shaping equipment and the equipment to be tested by using a network cable;
step 4, sending the test data to finish the test
After the preparation work is finished, controlling the frame sending equipment to send frames, and after the shaping equipment receives the data frames, storing and forwarding the data frames according to the settings of the sending schedule and the receiving schedule so that the sent data frames can meet the test requirements;
receiving a data frame:
the shaping device receives the data frames sent by the frame sending device through the receiving port, and the receiving structure covers a time stamp on each data frame;
for each received data frame, the shaper performs the following processing:
aiming at the real-time data frame number, the receiving engine searches a corresponding scheduling table item in a storage structure of a receiving scheduling table, and judges whether the data frame arrives in a specified receiving time window or not according to the timestamp; if the data frame passes the verification, setting a data transmission structure according to the real-time data cache region number in the scheduling table entry, and enabling the data frame to flow to a specified real-time data cache region;
and sending a data frame:
each transmission port transmission engine module polls all schedule entries of the transmission schedules in the transmission schedule storage structure;
if the item sending time of a certain scheduling table is reached, the sending engine sets a data transmission structure to read a data frame from a real-time data cache region appointed by the item, and if the real-time data cache region has the data frame, the data frame is read and sent out through a sending port; if no valid data exists, no operation is performed; multiple sending ports of the shaping equipment can realize that multiple ports send data frames in parallel according to accurate time points;
the sending engine prefetches the next schedule table entry while polling the storage structure of the sending schedule table and informs the priority arbitration structure of the next sending time point, so that the priority arbitration structure can perform precomputation to ensure the timely sending of real-time frames;
clock synchronization:
the shaping device can periodically send the clock synchronization frame through the clock synchronization control structure so as to ensure that the frame sending device can accurately time the whole tested device.
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| CN110545152B (en) * | 2019-09-10 | 2020-12-04 | 清华大学 | Upper computer with real-time transmission function in Ethernet and Ethernet system |
| CN111711476B (en) * | 2020-04-26 | 2022-04-19 | 四川润泽经伟信息技术有限公司 | Real-time frame synchronization system and method based on satellite communication countermeasure system |
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