CN108134721A - A kind of anti-adverse environment Ethernet LAN communication system - Google Patents
A kind of anti-adverse environment Ethernet LAN communication system Download PDFInfo
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- CN108134721A CN108134721A CN201711322382.XA CN201711322382A CN108134721A CN 108134721 A CN108134721 A CN 108134721A CN 201711322382 A CN201711322382 A CN 201711322382A CN 108134721 A CN108134721 A CN 108134721A
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- terminal device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
Abstract
The present invention relates to a kind of anti-adverse environment Ethernet LAN communication systems, are related to Ethernet communication technology field.Present invention application has the advantage of low cost at a high speed based on standard ethernet technology；Agreement framework is simplified, upper layer software (applications) agreement is fallen in optimization, improves real-time communication；Using LLC Type2 command response operation modes, communication certainty is improved；Using dual redundant network technology, communication reliability is improved；Using monitoring port, communication service can be monitored；Using acknowledgement frame Portable device status information, system maintenance is improved.
Description
Technical field
The present invention relates to Ethernet communication technology fields, and in particular to a kind of anti-adverse environment Ethernet local area network communication system
System.
Background technology
At present, the interconnection of special equipment is still mostly using 485 buses, 1553B buses and CAN bus etc., transmission architecture
Still the bus-type framework before twenty or thirty year is continued to use, bus system is of high cost, and transmission rate is low, it is difficult to realize that big data is transmitted,
Have become the bottleneck of limitation systematic entirety energy.Special equipment bus also attempted other high-speed buses such as optical-fibre channel (FC)
And Ethernet.But since the connector shock resistance of FC is not strong, fiber cross-sections vulnerable to pollution, fiber optic cable are easily lost, non-refractory
The shortcomings of FC is caused to be difficult to apply the adverse circumstances in weaponry.And Ethernet is occupying industry ethernet due to each terminal
Upper to generate conflict, competition bus bandwidth brings uncertainty.The prior art uses ICP/IP protocol, but due to ICP/IP protocol
Complexity needs operating system protocol stack to support, and software protocol real-time is poor.And network monitoring, management and maintainability are insufficient
The shortcomings of also further limit application of the Ethernet in special equipment field.
Invention content
(1) technical problems to be solved
The technical problem to be solved by the present invention is to：How to design it is a kind of have real-time, certainty, reliability, can monitor,
The Ethernet LAN communication system of the anti-adverse environment of easy care feature without using ICP/IP protocol, is realized under adverse circumstances
Ethernet local area network communication.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of anti-adverse environment Ethernet LAN communication system,
Including three layer protocol frameworks：Physical layer, link layer and application layer, the physical layer uses standard ethernet physical layer, for reality
Existing ethernet PHY and 100BASE-TX physical interface functions；The link layer uses standard ethernet media access control sublayer and LLC logics
Link control sublayer is used to implement MAC logics and LLC logic functions；The application layer is used to implement Client application software and hard
Part interface driver function；
The system uses dual redundant network, and the terminal device of system is made of computer and terminal interface board, every piece
Terminal interface board has 2 identical Ethernet physical interfaces, each Ethernet physical interface point of terminal interface board
Not Lian Jie 2 identical Ethernet Layer 2 switch, each terminal device possesses 2 sets of identical exchange networks in system,
Realize dual redundant communication；
Preferably, the Ethernet Layer 2 switch, MAC Address and port numbers used by the switching equipment of the system
Between look-up table, i.e., MAC Address-port numbers look-up table use static configuration；Port receives processing and abandons CRC check mistake
Ethernet frame abandons the ethernet frame that source MAC is not inconsistent with receiving port number；It exchanges according to the mesh of ethernet frame received
MAC Address, search MAC Address-port numbers look-up table and obtain transmitting terminal slogan, and the ethernet frame received is exchanged into hair
Sending end mouth；Ethernet frame content is not changed in port transmission processing, the original Ethernet frame transmitted and received；Monitoring port can be to appointing
The business of one monitored port of meaning carries out mirror image processing.
Preferably, in the system, object is established by Ethernet cable between terminal device and Ethernet Layer 2 switch
Reason link, if communicating pair is terminal device A and terminal device B, then the data flow between terminal device A and terminal device B is：
After the application layer-LLC sublayers in terminal device A from top to bottom and media access control sublayer-physical layer, pass through device A and too two layers of friendship of net
Physical link between changing planes reaches too net Layer 2 switch, then physical layer-media access control sublayer-physics in too net Layer 2 switch
After layer, terminal device B is reached by the physical link too between net Layer 2 switch and terminal device B, passes through terminal device B
Physical layer-media access control sublayer from bottom to up inside and LLC sublayers-application layer；Wherein the application layer of terminal device A is with terminal device B's
Data transfer path between application layer is known as virtual link, and system uses connection-oriented service mode, i.e., in two terminals
Equipment application interlayer provides virtual link and establishes, resets, terminating and a series of data transmission this communication service end to end.
Preferably, the end-to-end communication service realizes LLC Type2 operation modes by LLC sublayers function, i.e. source is whole
End equipment sends communications command to purpose terminal device, and being sent after the completion of purpose terminal device reception processing to source terminal equipment should
Response is answered, in link establishment phase, terminal device A sends SABME frames to terminal device B, and for establishing virtual link, terminal is set
After standby B receives SABME frames, condition responsive UA frames are sent to terminal device A, represent to receive to establish virtual link order；In number
According to the transmission stage, terminal device A sends I frames to terminal device B, for data transmission, after terminal device B receives I frames, to end
End equipment A sends condition responsive RR frames, represents to receive data transfer command, the state that terminal device A receiving terminal apparatus B is returned
Response continues to send next I frames, otherwise retransmits current I frames if success；In the link down stage, terminal device A to
Terminal device B sends DISC frames, for removing virtual link, after terminal device B receives DISC frames, is sent to terminal device A
Condition responsive UA frames represent to receive and remove virtual link order.
Preferably, the condition responsive UA frames receive the response after order, and wrap comprising equipment as defined in LLC standards
Containing the current status information of equipment, for feeding back to the opposite end of virtual link.
Preferably, the condition responsive UA frames replace the fill part of ethernet frame payload using the status information of equipment.
(3) advantageous effect
Present invention application has the advantage of low cost at a high speed based on standard ethernet technology；Agreement framework is simplified, optimization is fallen
Upper layer software (applications) agreement improves real-time communication；Using LLC Type2 orders-respond operation mode, communication certainty is improved；It adopts
With dual redundant network technology, communication reliability is improved；Using monitoring port, communication service can be monitored；It is carried using acknowledgement frame
Status information of equipment improves system maintenance.
Description of the drawings
Fig. 1 is a kind of layered structure schematic diagram of anti-adverse environment Ethernet LAN communication system of the present invention；
Fig. 2 is a kind of topology diagram of anti-adverse environment Ethernet LAN communication system of the present invention；
Fig. 3 is a kind of data flow of anti-adverse environment Ethernet LAN communication system of the present invention and link (virtual chain
Road) schematic diagram；
Fig. 4 is a kind of end-to-end communication service signal of anti-adverse environment Ethernet LAN communication system of the present invention
Figure.
Specific embodiment
To make the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to the present invention's
Specific embodiment is described in further detail.
The Ethernet LAN communication system of a kind of anti-adverse environment proposed by the present invention, using three layer protocol framves of optimization
Structure：Physical layer is using standard ethernet physical layer, link layer using standard ethernet media access control sublayer and LLC logic link controls
(removing) network layer, transport layer, session layer and expression layer are fallen in layer, optimization, retain application layer.As shown in Figure 1, physical layer function base
Hardware design is carried out in commercial IC chip, realizes ethernet PHY and 100BASE-TX physical interface functions.Link layer is based on FPGA
Logical design is carried out, it is main to realize MAC logics and LLC logic functions.Application layer is based on CPU and carries out Software for Design, main to realize
Client application software and hardware interface driver function.
The Ethernet LAN communication system of a kind of anti-adverse environment, using dual redundant network.The terminal of system
Equipment is made of computer and terminal interface board.Every piece of terminal interface board has 2 identical Ethernet physical interfaces.
Each Ethernet physical interface of terminal interface board connects 2 identical Ethernet Layer 2 switch respectively.Such as Fig. 2 institutes
Show, each terminal device possesses 2 sets of identical exchange networks in system, realizes dual redundant communication.
The Ethernet LAN communication system of the anti-adverse environment, Ethernet Layer2 switching used by switching equipment
Machine, MAC Address-port numbers look-up table use static configuration；Port receives the ethernet frame that processing abandons CRC check mistake, loses
Abandon the ethernet frame that source MAC is not inconsistent with receiving port number；It exchanges according to the target MAC (Media Access Control) address of ethernet frame received,
It searches MAC Address-port numbers look-up table and obtains transmitting terminal slogan, and the ethernet frame received is exchanged into sending port；End
Ethernet frame content is not changed in mouth transmission processing, the original Ethernet frame transmitted and received；Monitoring port can be to any one quilt
Monitor that the business of port carries out mirror image processing.
In the Ethernet LAN communication system of the anti-adverse environment, between terminal device and Ethernet Layer 2 switch
Physical link is established by Ethernet cable.As shown in figure 3, the data flow between terminal device A and terminal device B is：Through end
After application layer-LLC sublayers and media access control sublayer-physical layer in end equipment A from top to bottom, pass through device A and too net Layer 2 switch
Between physical link reach too net Layer 2 switch, then after physical layer-media access control sublayer-physical layer in too net Layer 2 switch,
Terminal device B is reached by physical link too between net Layer 2 switch and terminal device B, pass through in terminal device B from
Under supreme physical layer-media access control sublayer and LLC sublayers-application layer.The wherein application layer of terminal device A and the application of terminal device B
Data transfer path between layer is known as virtual link.System uses connection-oriented service mode, i.e., in two terminal devices
Virtual link is provided using interlayer to establish, reset, terminate and a series of data transmission this communication service end to end.
The end-to-end communication service realizes LLC Type2 operation modes, i.e. source terminal equipment by LLC sublayers function
Communications command is sent to purpose terminal device, sending response to source terminal equipment after the completion of purpose terminal device reception processing rings
It should.As shown in figure 4, in link establishment phase, terminal device A sends SABME frames to terminal device B, for establishing virtual link.
After terminal device B receives SABME frames, condition responsive UA frames are sent to terminal device A, represent to receive to establish virtual link life
It enables；In data transfer phase, terminal device A sends I frames to terminal device B, for data transmission.Terminal device B receives I frames
Afterwards, condition responsive RR frames are sent to terminal device A, represents to receive data transfer command.Terminal device A receiving terminal apparatus B is returned
The condition responsive returned continues to send next I frames, otherwise retransmits current I frames if success；In the link down stage, eventually
End equipment A sends DISC frames to terminal device B, for removing virtual link.After terminal device B receives DISC frames, to terminal
Device A sends condition responsive UA frames, represents to receive and removes virtual link order.
The condition responsive frame not only receives the response after order, and comprising setting comprising equipment as defined in LLC standards
Standby current status information, for feeding back to the opposite end of virtual link.The response frame that LLC standards define, does not carry data information,
To meet 802.3 standards, ethernet frame payload part is filled in vain.The condition responsive frame of system, using the state of equipment
Information data replaces the invalid filling, to improve the maintainability of end-to-end communication.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of anti-adverse environment Ethernet LAN communication system, which is characterized in that including physical layer, link layer and application
Layer, the physical layer use standard ethernet physical layer, are used to implement ethernet PHY and 100BASE-TX physical interface functions；
The link layer uses standard ethernet media access control sublayer and LLC logical link control sublayers, is used to implement MAC logics and LLC logics
Function；The application layer is used to implement Client application software and hardware interface driver function；
The system uses dual redundant network, and the terminal device of system is made of computer and terminal interface board, every piece of terminal
Interface board has 2 identical Ethernet physical interfaces, and each Ethernet physical interface of terminal interface board connects respectively
2 identical Ethernet Layer 2 switch are connect, each terminal device possesses 2 sets of identical exchange networks in system, realizes
Dual redundant communicates.
2. the method as described in claim 1, which is characterized in that the Ethernet two used by the switching equipment of the system
Layer switch, the look-up table between MAC Address and port numbers, i.e. MAC Address-port numbers look-up table use static configuration；Port
The ethernet frame that processing abandons CRC check mistake is received, abandons the ethernet frame that source MAC is not inconsistent with receiving port number；It hands over
It changes according to the target MAC (Media Access Control) address of ethernet frame received, searches MAC Address-port numbers look-up table and obtain transmitting terminal slogan, and
The ethernet frame received is exchanged into sending port；Ethernet frame content is not changed in port transmission processing, is transmitted and received
Original Ethernet frame；The business that monitoring port can be monitored any one port carries out mirror image processing.
3. the method as described in claim 1, which is characterized in that in the system, terminal device and Ethernet Layer 2 switch
Between physical link established by Ethernet cable, if communicating pair is terminal device A and terminal device B, then terminal device A with
Data flow between terminal device B is：Application layer-LLC sublayers from top to bottom and media access control sublayer-physical layer in terminal device A
Afterwards, the physical link by device A and too between net Layer 2 switch reaches too net Layer 2 switch, then through too net Layer2 switching
In machine after physical layer-media access control sublayer-physical layer, reached eventually by the physical link too between net Layer 2 switch and terminal device B
End equipment B passes through physical layer-media access control sublayer and LLC sublayers-application layer in terminal device B from bottom to up；Wherein terminal is set
Data transfer path between the application layer of standby A and the application layer of terminal device B is known as virtual link, and system is used towards connection
Service mode, i.e., two terminal device application interlayers provide virtual links establish, reset, terminate and data transmission this be
Arrange communication service end to end.
4. method as claimed in claim 3, which is characterized in that the end-to-end communication service is realized by LLC sublayers function
LLC Type2 operation modes, i.e. source terminal equipment send communications command, purpose terminal device reception processing to purpose terminal device
Response is sent to source terminal equipment after completion, in link establishment phase, terminal device A sends SABME to terminal device B
Frame for establishing virtual link, after terminal device B receives SABME frames, sends condition responsive UA frames to terminal device A, represents
Virtual link order is established in receiving；In data transfer phase, terminal device A sends I frames to terminal device B, for data transmission,
After terminal device B receives I frames, condition responsive RR frames are sent to terminal device A, represent to receive data transfer command, terminal is set
The condition responsive that standby A receiving terminal apparatus B is returned, continues to send next I frames, otherwise retransmits current I frames if success；
In the link down stage, terminal device A sends DISC frames to terminal device B, and for removing virtual link, terminal device B is received
To after DISC frames, condition responsive UA frames are sent to terminal device A, represents to receive and removes virtual link order.
5. method as claimed in claim 5, which is characterized in that the condition responsive UA frames include equipment as defined in LLC standards
The response after order is received, and comprising the current status information of equipment, for feeding back to the opposite end of virtual link.
6. method as claimed in claim 5, which is characterized in that the condition responsive UA frames are replaced using the status information of equipment
The fill part of ethernet frame payload.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711322382.XA CN108134721A (en) | 2017-12-12 | 2017-12-12 | A kind of anti-adverse environment Ethernet LAN communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711322382.XA CN108134721A (en) | 2017-12-12 | 2017-12-12 | A kind of anti-adverse environment Ethernet LAN communication system |
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Application publication date: 20180608 |