CN105991384A - Communication method for aerospace Ethernet compatible with time-triggered Ethernet and 1553B - Google Patents
Communication method for aerospace Ethernet compatible with time-triggered Ethernet and 1553B Download PDFInfo
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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]
- H04L12/40—Bus networks
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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]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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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]
- H04L12/40—Bus networks
- H04L12/40143—Bus networks involving priority mechanisms
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Abstract
The invention relates to the field of time-triggered Ethernet. In order to realize the fact that the new-generation aerospace Ethernet bus (AEB) has the advantages of high speed, strong real-time performance, high reliability, safety and credibility, both high reliability of 1553 and low cost of the Ethernet are achieved, and the existing weapon aircraft and the like all adopt a 1553 scheme, a user can make no change for realizing smooth transition from 1553 to AEB, and while the cost is reduced, and the stability and the reliability can still be ensured, a communication method for aerospace Ethernet compatible with time-triggered Ethernet and 1553B is provided according to the technical scheme adopted by the invention. A time-triggered compatible protocol architecture is adopted to transmit three different priorities of data frames: command corresponding data, IT application data and time-triggered data, and the three frames all adopt a standard Ethernet frame format, type domain values are different due to packaging through different protocols. The method of the invention is mainly applied to Ethernet communication.
Description
Technical field
The present invention relates to Time Triggered Ethernet field, specifically, relate to the space flight ether of compatible Time Triggered Ethernet and 1553B
Network bus.
Background technology
Along with making constant progress of Space Science and Technology, space technology extensively benefits the whole mankind at civil area, especially in space
The fields such as detection, satellite navigation, meteorological observation and extraterrestrial life exploration have reached unprecedented height.But also result in simultaneously
Spacecraft total system day by day complicated, though experienced by the repeatedly update of electronic technology, the process of each stand-alone device
Ability has obtained tremendous increase, but the interconnection of equipment room transmission system shows slightly backward.The most still the transmission before twenty or thirty year is continued to use
Framework, i.e. controls bus and uses 1553 buses, 1394 buses etc., data transmission to use extra dedicated bus, not only framework
Complicated, cost height, and software work amount is huge, it usually needs for the software and hardware system that transmission control design case is special.Along with
The further increase of Future Spacecraft system task load, the manpower and materials for telecommunication transmission system put into and will be doubled and redoubled, this
Contradict with civil aerospace technology system low cost, high efficiency objective, become the bottleneck limiting Space Vehicle System overall performance.Therefore
It is necessary to develop a set of unified transmission network bus, consolidated network bus both can complete control information in real time, reliably
Transmission, again can the transmission completing big data quantity information at a high speed, there is secure and trusted measure simultaneously, it is ensured that key message transmits
Safety and reliability.It is thus desirable to a kind of compatible Time Triggered Ethernet and the space flight industry ethernet of new generation of 1553.
Time Triggered ethernet technology provides Time Triggered service on the communication controler of ethernet terminal and switch, by clock
Synchronizing information spreads all over the whole network and synchronizes the local clock on the whole network all devices communication controler, so that the whole network is when unified
Under clock system, send Time Triggered data (Time-Triggered Message, TTM) by the scheduling rule made in advance,
Realize the Lothrus apterus reliable diffusion of TTM, it is ensured that the real-time of TTM and bandwidth demand.And sending out without Time Triggered data
In the case of sending, comprehensive compatible existing ethernet standard normal transmission rate restricted data and best-effort traffic.Its time determines
Property, fault mechanism, high real-time and the feature of Ethernet and " doing one's best " combine.For that synchronize, highly reliable
Embedding assembly provides with network, fault-tolerant design and supports.
Time Triggered Ethernet establishes clock more accurately and synchronizes system so that it is real to ensure that synchronization accuracy is accurate to nanosecond
Time data transmit accurately.Time Triggered Ethernet controls by implementing Time Triggered on the mac layer, synchronizes at the whole network
The Time Triggered information of the lower uncontested state of offer transmits and ensures.
There is no mature technology report at present.
Summary of the invention
For overcoming the deficiencies in the prior art, it is intended that a new generation space flight industry ethernet (AEB) have two-forty,
Hard real time, advantage highly reliable, safe and reliable, existing 1553 highly reliable, have again the low cost of Ethernet concurrently, rely in addition
Redundancy Design further improves reliability.And the system such as existing weapon aircraft all uses the scheme of 1553, user can
Do any change, smooth the transition realizing 1553 to AEB, while reducing cost, still can ensure stability and reliability.
The technical solution used in the present invention is, compatible Time Triggered Ethernet and the space flight ethernet communication method of 1553B, uses the time
The Frame of triggering compatible protocol framework three kinds of different priorities of transmission: order corresponding data, IT application data and Time Triggered number
According to, these three frame all uses standard ethernet frame format, only causes the value in type territory to have because of the encapsulation through different agreement
Institute is different；
A) Time Triggered data
Time Triggered data have TP top priority, and the type ethernet frame uses contention mode transmission, and Time Triggered data are led to
Cross Time Triggered and service direct incoming bottom, or by the incoming MAC layer of ICP/IP protocol, pass when nodal clock arrives configuration
Defeated Time Triggered data time point, communication link will soar all data transmitted, and proceeds to as Time Triggered data, services；
B) command response data
Command response data real-time compared with Time Triggered data is relatively low, it is not necessary to send by the time of system synchronization clock, because of
These command response data are likely waited in line in the network switch, to ensure that the Lothrus apterus N-free diet method of Time Triggered data transmits；
Command response data were both directly entered MAC layer by 1553 transmission control protocols, or first passed through ICP/IP protocol and enter back into
MAC layer；
C) IT application data
Priority is minimum, by the incoming MAC layer of ICP/IP protocol.
(1) being transmitted by 1553B transmission control protocol when data: when application layer has data distributing to arrive Internet, 1553B transmits
Control protocol can add command word before data division, adds status word complete to constitute one after data division
Multiple message are organized formation frame by message, and this frame is handed down to MAC layer；
(2) transmitted by ICP/IP protocol when data: ICP/IP protocol adds stem before data division, at data message
Afterbody add CRC redundancy check to constitute complete frame.This frame is i.e. handed down to MAC layer；
(3) when data are by Time Triggered agreement: add clock accurately in Time Triggered agreement and synchronize system, i.e. data letter
Breath is to send according to fixed time interval, and the control mechanism that clock synchronizes is to be come by a kind of control frame-Protocol Control frame PCF
Realizing, the Protocol Control frame value in the Type territory of common ethernet frame is 0x891d, and the fills of Protocol Control frame is just
The often data field field of ethernet frame；When having data message elapsed time triggered protocol when, Time Triggered consultation is according to association
The frame structure of view control frame is at data division addition Protocol Control frame to constitute complete frame, and this frame i.e. can be handed down to MAC layer.
This Protocol Control frame has 6 fields:
(1) Integration Cycle field: 32bit, represents the integration period at this PCF frame place；
(2) Membership New field: 32bit, is a bit vectors, and it is right that each bit in vector represents in network
The isochronous controller SM answered；
(3) Sync Priority field: 8bit, is the synchronization priority of this equipment being pre-configured with；
(4) Sync domain field: 8bit, is the synchronization field of this equipment being pre-configured with；
(5) the type field: specify the type of this PCF frame；
(6) Transparent clock field: 64bit, stores this PCF frame and obtains sender from it and experienced to final receiver
Delay.
Multi-business scheduling, seamless redundancy, secure and trusted mechanism is added between MAC layer and Internet.
Fault tolerant mechanism includes altogether:
1) time-out surveillance technology
Time-out surveillance technology, i.e. using the time limit as criterion, arbitrates whether passage breaks down；
2) rate limit
The velocity maximum of each terminal node port is set at call access control device and sends data to limit node to whole network
Big speed.When speed exceedes the maximum of setting, design call access control device is directly nipped off this node port and is forbidden to grid
Send data and point out discovery fault；
3) multichannel
On data are transmitted, multi-channel parallel is used to run.
Seamless redundancy scheme:
Use highly reliable seamless redundancy (HSR) agreement in static redundancy；
(3) secure and trusted mechanism:
Use the secure communication mechanism of EPA: comprise EPA protocol type, IP heading, UDP heading, EPA application layer services
Heading and EPA safety communication data unit；Wherein EPA safety communication data unit (FSPDU) is by using relation key, sequence
The measure such as row number, timestamp and CRC check ensures data integrity and the available time communicated.
The feature of the present invention and providing the benefit that:
The present invention applies physical layer and the data link layer of 802.3 traditional ethernets, and the Data Transmission Controlling of 1553, configurable
Time Triggered ethernet feature, increases again seamless redundancy and secure and trusted mechanism so that a new generation's space flight bus can the most accurately
The transmission completing big data quantity information, there is secure and trusted measure simultaneously.Simultaneously compatible 1553 agreements, it is possible to achieve 1553
Bus seamlessly transitting to AEB.
Accompanying drawing illustrates:
Fig. 1 Time Triggered compatible protocol configuration diagram.
Detailed description of the invention
The present invention relates to Time Triggered Ethernet field, it is same by definitiveness, fault tolerant mechanism and the real-time performance of Time Triggered technology
The common motility of Ethernet, the ability of dynamic property and " doing one's best " combine.For that synchronize, highly reliable embedded
Calculate to provide with network, fault-tolerant design and support.
The technical solution adopted in the present invention is: apply physical layer and the data link layer of 802.3 traditional ethernets, and 1553
Data Transmission Controlling, configurable Time Triggered ethernet feature, increase again seamless redundancy and secure and trusted mechanism, at consolidated network
Bus both can complete control information transmission in real time, reliably, again can the transmission completing big data quantity information at a high speed, with
Time there is secure and trusted measure, it is ensured that key message transmission safety and reliability.
In order to realize the space flight industry ethernet of new generation of compatible Time Triggered Ethernet and 1553B, propose a kind of Time Triggered and hold concurrently
Hold protocol infrastructure.Time Triggered compatible protocol framework support various in real time and the network model of demand for security, and compatibility standard with
Too fidonetFido, the Frame of Time Triggered compatible protocol framework three kinds of different priorities of transmission: order corresponding data, IT application number
According to Time Triggered data.
On the basis of 1553B bus, apply physical layer and the data link layer of 802.3 traditional ethernets, do not change physics
In the case of layer and the original agreement of data link layer, setup time triggers ethernet feature.Its implementation is to add at IP layer
Time Triggered services, and i.e. changes frame structure, sends Time Triggered data by the scheduling rule made in advance, it is achieved the time touches
Send out the Lothrus apterus reliable diffusion of data, it is ensured that the real-time of data transmission and bandwidth demand.Increase between MAC layer and IP layer simultaneously
Add seamless redundancy and secure and trusted mechanism so that in consolidated network bus, both can complete the transmission of control information in real time, reliably,
Again can the transmission completing big data quantity information at a high speed.
Time Triggered compatible protocol framework (Fig. 1) transmits the Frame of three kinds of different priorities: order corresponding data, IT application
Data and Time Triggered data.High order end is command response data, and they can be by 1553 transmission control protocols and traditional
The incoming physical layer of ICP/IP protocol.Middle is IT application data, for simplest service data, can be controlled by 1553 transmission
Agreement processed, ICP/IP protocol and the incoming physical layer of Time Triggered agreement.Generally, IT application data only pass through TCP/IP
The incoming physical layer of agreement, transmission during because it does not wants realistic, at a high speed.Low order end is Time Triggered data, when it can pass through
Between triggered protocol and the incoming physical layer of ICP/IP protocol, generally, Time Triggered data are passed by Time Triggered agreement
Defeated, because this data major part is for controlling data, it is desirable to transmission in real time, at a high speed.
The data of three kinds of different priorities add the most again seamless redundancy, the most incoming physical layer of secure and trusted mechanism, to protect
The safety and reliability of card data transmission.Introduce transmission means and the flow process of 3 kinds of dissimilar agreements separately below.
(1) when data are by 1553B transmission control protocol: the information under the control of 1553B host-host protocol, on data/address bus
Stream is made up of message, has 10 kinds of message formats.Message is made up of 3 kind type-words, respectively command word, data word and status word,
Each message is including at least 2 words (only having command word and status word when data is not).The stem of each word is 3 synchronous heads
Position, centre is 16 message digits, and afterbody is 1 parity check bit.Front 3 sync bits of 3 kind type-words and last position are strange
Even parity bit is identical, and 16 middle message digits are different.Wherein the message digit of command word includes RT address, data word
Number, the information such as mode code.The message digit of data word is the data sent under application layer.The message digit of status word includes message
Mistake, information on services, dynabus controls the information such as reception.Because 1553B transmission control protocol is operated in Internet, when answering
When having data distributing to arrive Internet with layer, 1553B transmission control protocol can add order before data division (i.e. data word)
Word, adds status word to constitute a complete message after data division.Each message contains up to 32 data words,
Contain up to 36 words.In order to complete certain function it is necessary to multiple message are organized formation frame.This frame i.e. can issue
To MAC layer.
(2) when data are by ICP/IP protocol: an IP datagram is made up of stem and data division.When data message passes through
During ICP/IP protocol, ICP/IP protocol can add stem before data division.The front portion of stem is regular length, altogether
20 bytes, all IP datagrams must have.Fixed position in stem is followed by some Optional Fields, its length
It is variable.The information the such as wherein field of regular length part comprises version, header length, and sheet offsets, life span, agreement.
Variable part is an Option Field, and Option Field is used for supporting the measures such as misarrangement, measurement and safety, and the length of its field can
Become, from 1 byte to 40 byte.After adding stem, the afterbody at data message adds CRC redundancy check with structure
Become complete frame.This frame i.e. can be handed down to MAC layer.
(3) when data are by Time Triggered agreement: in Time Triggered agreement, it is most important that add clock accurately and synchronize
System, i.e. data message send according to fixed time interval.The control mechanism that clock synchronizes is mainly by a kind of special
Different control frame-Protocol Control frame (PCF) realizes.The Protocol Control frame value in the Type territory of common ethernet frame is 0x891d,
The fills of Protocol Control frame is in the data field field of normal ethernet frame.This Protocol Control frame has 6 fields.
(7) Integration Cycle field: 32bit, represents the integration period at this PCF frame place.
(8) Membership New field: 32bit, is a bit vectors, and it is right that each bit in vector represents in network
The isochronous controller SM answered.
(9) Sync Priority field: 8bit, is the synchronization priority of this equipment being pre-configured with.
(10) Sync domain field: 8bit, is the synchronization field of this equipment being pre-configured with.
(11) the type field: specify the type of this PCF frame.
(12) Transparent clock field: 64bit, stores this PCF frame and obtains sender to final receiver institute warp from it
The delay gone through.
When having data message elapsed time triggered protocol when, Time Triggered consultation is according to the frame structure of above-mentioned Protocol Control frame
Protocol Control frame is added to constitute complete frame at data division.This frame i.e. can be handed down to MAC layer.
In data message fault tolerant mechanism to be added, seamless redundancy scheme and secure and trusted mechanism after IP layer shape.Separately below
Introduce and add three kinds of machine-processed implementation methods:
(1) fault tolerant mechanism includes three kinds of technology altogether:
1. time-out surveillance technology
Time-out surveillance technology, i.e. using the time limit as criterion, arbitrates whether passage breaks down.Time Triggered data (TTM)
Requirement of real-time is the highest, and the requirement in time limit is the harshest, therefore uses time-out surveillance technology to carry out tracing trouble mould in system emulation
Type.
2. rate limiting technique
Call access control device is provided with the velocity maximum of each terminal node port and sends data to limit node to whole network
Big speed.When speed exceedes the maximum of setting, design call access control device is directly nipped off this node port and is forbidden to grid
Send data and point out discovery fault.
3. multichannel technology
On data are transmitted, use multi-channel parallel running technology.CM use overtime technology and rate limiting technique carry out
Fault diagnosis.If discovery fault, then it is assumed that this passage sends fault cannot normally complete data-transformation facility, produces information.
Can run well owing to multichannel existence ensure that in the same old way.TTE have employed switch and end system concentrated protection measure, i.e. connects
Receive controller.Protection mechanism can check whether network service works according to predefined parameter.If the system congestion of mistake
Network segment, protection mechanism will nip off this network segment or interface.The employing of the protection mechanism of multiple redundancy is well positioned to meet
The requirement of high security.
(2) seamless redundancy scheme:
Owing to Time Triggered real-time property requires the highest, it requires that network has zero failure recovery time, but, Ethernet
Agreement and ICP/IP protocol undefined redundancy communication mode itself, therefore need to add seamless redundancy scheme in this protocol infrastructure.
IEC62439.3 proposes the settling mode of two kinds of feasible increase network redundancies: network internal redundancy and redundancy save to terminal
Point.Network internal redundant fashion has link and the switch of redundancy, but node only one of which port is connected into switch, and network is
Partial redundance, and it is generally in inactive state, postpone so introducing fault recovery.Redundancy is in terminal node mode
Terminal node has extra communication link, parallel network or path to provide high reliability and zero failure recovery time such that it is able to
Meet the application of some special occasions.
Redundancy protocol is generally divided into two classes, and the first kind is dynamic redundancy management, and now redundant entity only can be when network failure
Work, the medium redundancy protocol (MRP) that such as Spanning-Tree Protocol (STP), RSTP (RSTP) and IEC propose.
The link being had the node of loop when these agreements normally work by obstruction avoids loop, and fault enables blocked after occurring
Redundant via, thus reduce failure recovery time as far as possible.Another kind of is static redundancy, and now redundant entity is same with proper network
Time work, such as Parallel Redundancy Protocol (PRP) and highly reliable seamless redundancy (HSR) agreement.PRP introduces redundancy scheme at the second layer,
Thus the agreement on upper strata is kept fully transparent.Its dual link node uses two separate transmitted data on network simultaneously, from
And ensure zero failure recovery time.This framework thinks that highly reliable seamless redundancy (HSR) agreement in use static redundancy can preferably increase
Add the redundancy of time trigger data (TTE), to reach best redundancy effect.
(3) secure and trusted mechanism:
The secure and trusted mechanism of this framework employs the secure communication mechanism of EPA.EPA secure communication message contains EPA protocol class
Type, IP heading, UDP heading, EPA application layer services heading and EPA safety communication data unit.The most main
For EPA safety communication data unit (FSPDU).FSPDU is by using relation key, serial number, timestamp and CRC check
Data integrity and the available time of communication is ensured Deng measure.
1. relation key: 4Byte.For every a pair correspondence, communication source and communication objective side, there is unique communication identifier (to close
It is key).Being used for preventing addressing mistake, the most safety-related message mails to the safety-related participant of mistake.Relation key is used for constituting
CRC, but it is not used in communication.
2. serial number: 2Byte.Being used for identifying communication initiator and send the order of data, scope is 0-255.It is 0 time initial,
Often it is successfully transmitted an EPA Functional Safety Communication data message, just serial number is increased by 1.When reaching 255, return to 1.
Each the corresponding serial number of service.
3. timestamp: 8Byte.The moment that record EPA functional safety layer data sends.When recipient receives message, must detection
Whether the difference of the timestamp and time when receiving that receive message has exceeded maximum allowable time, if exceeding, is judged to time delay event
Barrier.
4.CRC verifies: 4Byte.CRC calculates different from common division, and common division is to borrow to subtract each other, and CRC calculates and is then
XOR.When using CRC, black channel can not use the CRC multinomial identical with functional safety layer.By relation key,
Serial number, timestamp, user data carry out the value of CRC.
Three kinds of different types of data realize the transmission of different priorities by multi-business scheduling.Can be according to the mode of artificial selection
Determine that what type of data are transmitted by what type of agreement.
A) Time Triggered data
In three kinds of data streams that this framework is supported, Time Triggered data have TP top priority, the type in whole system
Ethernet frame uses contention mode transmission.Time Triggered data both can service direct incoming MAC layer by Time Triggered, also
Can be by traditional incoming bottom of ICP/IP protocol.Because this data type requirement of real-time is higher, major part was touched by the time
Send out the incoming MAC layer of agreement.When nodal clock arrives configuration transmission Time Triggered data time point, and communication link will soar institute
There are the data transmitted, proceed to as Time Triggered data, services.Ensure that Time Triggered data energy Lothrus apterus, N-free diet method transmit.
B) command response data
Command response data real-time compared with Time Triggered data is relatively low, it is not necessary to send by the time of system synchronization clock, because of
Robbing for Time Triggered data and account for transmission channel, therefore command response data are likely waited in line in the network switch, to protect
The Lothrus apterus N-free diet method transmission of card Time Triggered data.Command response data both can be directly entered by 1553 transmission control protocols
MAC layer can also first pass through ICP/IP protocol and enter back into MAC layer.Owing to the priority of command response data is higher than IT application
Data, the most most command response data can pass through the incoming MAC layer of 1553B control protocol.
C) IT application data
IT application data are simplest service data, do not use complicated confirmation system to ensure that reliable information is transmitted.Use net
The application program of network can it considers that necessary time send any number of data at any time, and need not get the Green Light in advance,
Also without notice network, therefore its priority is minimum.IT application data need not high real-time, therefore passes through TCP/IP
The incoming bottom of agreement, to ensure that Time Triggered data are high in real time, highly reliable transmission.
Between MAC layer and Internet, add multi-business scheduling, seamless redundancy, secure and trusted mechanism, to ensure always simultaneously
Line both can complete control information transmission in real time, reliably, again can the transmission completing big data quantity information at a high speed, simultaneously
There is secure and trusted measure, it is ensured that safety, reliability and the high speed of key message transmission.
Claims (5)
1. compatible Time Triggered Ethernet and a space flight ethernet communication method of 1553B, is characterized in that, uses Time Triggered compatible
The Frame of protocol infrastructure three kinds of different priorities of transmission: order corresponding data, IT application data and Time Triggered data,
These three frame all uses standard ethernet frame format, only causes the value in type territory to have because of the encapsulation through different agreement
Institute is different；
A) Time Triggered data
Time Triggered data have TP top priority, and the type ethernet frame uses contention mode transmission, Time Triggered data
Direct incoming bottom is serviced by Time Triggered, or by the incoming MAC layer of ICP/IP protocol, when nodal clock arrives
Configuration transmission Time Triggered data time point, communication link will soar all data transmitted, and proceeds to as Time Triggered
Data, services；
B) command response data
Command response data real-time compared with Time Triggered data is relatively low, it is not necessary to send by the time of system synchronization clock,
Therefore command response data are likely waited in line in the network switch, to ensure the Lothrus apterus N-free diet method of Time Triggered data
Transmission；Command response data were both directly entered MAC layer by 1553 transmission control protocols, or first passed through TCP/IP association
View enters back into MAC layer；
C) IT application data
Priority is minimum, by the incoming MAC layer of ICP/IP protocol.
2. compatible Time Triggered Ethernet as claimed in claim 1 and the space flight ethernet communication method of 1553B, is characterized in that,
(1) transmitted by 1553B transmission control protocol when data: when application layer has data distributing to arrive Internet, 1553B
Transmission control protocol can add command word before data division, adds status word to constitute one after data division
Multiple message are organized formation frame by complete message, and this frame is handed down to MAC layer；
(2) transmitted by ICP/IP protocol when data: ICP/IP protocol adds stem before data division, in data
The afterbody of information adds CRC redundancy check to constitute complete frame.This frame is i.e. handed down to MAC layer；
(3) when data are by Time Triggered agreement: add clock in Time Triggered agreement and synchronize system, i.e. data message
Being to send according to fixed time interval, the control mechanism that clock synchronizes is by a kind of control frame-Protocol Control frame PCF
Realizing, the Protocol Control frame value in the Type territory of common ethernet frame is 0x891d, the fills of Protocol Control frame
Data field field at normal ethernet frame；When having data message elapsed time triggered protocol when, Time Triggered consultation
Adding Protocol Control frame to constitute complete frame according to the frame structure of Protocol Control frame at data division, this frame i.e. can be handed down to
MAC layer.
3. compatible Time Triggered Ethernet as claimed in claim 2 and the space flight ethernet communication method of 1553B, is characterized in that, association
View control frame PCF has 6 fields:
(1) Integration Cycle field: 32bit, represents the integration period at this PCF frame place；
(2) Membership New field: 32bit, is a bit vectors, and each bit in vector represents network
One isochronous controller SM of middle correspondence；
(3) Sync Priority field: 8bit, is the synchronization priority of this equipment being pre-configured with；
(4) Sync domain field: 8bit, is the synchronization field of this equipment being pre-configured with；
(5) the type field: specify the type of this PCF frame；
(6) Transparent clock field: 64bit, stores this PCF frame and obtains sender to final receiver institute warp from it
The delay gone through.
4. compatible Time Triggered Ethernet as claimed in claim 1 and the space flight ethernet communication method of 1553B, is characterized in that,
Multi-business scheduling, seamless redundancy, secure and trusted mechanism is added between MAC layer and Internet.
5. compatible Time Triggered Ethernet as claimed in claim 4 and the space flight ethernet communication method of 1553B, is characterized in that,
Fault tolerant mechanism includes altogether:
1) time-out surveillance technology
Time-out surveillance technology, i.e. using the time limit as criterion, arbitrates whether passage breaks down；
2) rate limit
The velocity maximum of each terminal node port is set at call access control device and sends data to limit node to whole network
Maximum rate.When speed exceedes the maximum of setting, design call access control device is directly nipped off this node port and is forbidden to being
System network sends data and points out discovery fault；
3) multichannel
On data are transmitted, multi-channel parallel is used to run.
Seamless redundancy scheme:
Use highly reliable seamless redundancy (HSR) agreement in static redundancy；
(3) secure and trusted mechanism:
Use the secure communication mechanism of EPA: comprise EPA protocol type, IP heading, UDP heading, EPA application layer
Service message head and EPA safety communication data unit；Wherein EPA safety communication data unit F SPDU is by using relation close
Key, serial number, timestamp ensure data integrity and the available time communicated with measures such as CRC checks.
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Cited By (18)
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