CN102714612A - Increasing the real-time capability of Ethernet networks - Google Patents
Increasing the real-time capability of Ethernet networks Download PDFInfo
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- CN102714612A CN102714612A CN2010800619098A CN201080061909A CN102714612A CN 102714612 A CN102714612 A CN 102714612A CN 2010800619098 A CN2010800619098 A CN 2010800619098A CN 201080061909 A CN201080061909 A CN 201080061909A CN 102714612 A CN102714612 A CN 102714612A
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- ethernet
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- data bag
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- ethernet unit
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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]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
Abstract
The invention relates to a method for transmitting at least one Ethernet packet between a transmitter and a receiver, to a device for carrying out a method according to the invention and to a network apparatus having such a device. In order to achieve a high degree of real-time capability and deterministics when using IEEE 802.3-compliant network components, according to the invention each Ethernet packet is segmented at the transmitter into a number of Ethernet packets, referred to as Ethernet cells, and is reassembled again at the receiver. By segmenting the Ethernet packets into Ethernet cells - naturally having a length clearly smaller than the maximum packet size - high-priority real-time packets are delayed for a significantly shorter time than long, unsegmented Ethernet packets.
Description
Technical field
The present invention relates to a kind of method, a kind of device and a kind of network equipment that has this device that is used to carry out according to the method for the invention that is used at least one Ethernet data bag of transmission between transmitter and receiver.
Background technology
This method or this device especially are used in industrial communication (for example, the manufacturing equipment) field, in this field, have used the communication protocol based on Ethernet more and more.Owing to can't reach the requirement of certainty and real-time in many cases, so be difficult to up to now fieldbus (for example, Profibus, Interbus) is adjusted into fieldbus on Ethernet according to the Ethernet of IEEE802.3 standard.Be between 64 bytes and 1522 bytes, (to have the VLAN label according to the reason of the certainty poor performance of the Ethernet of IEEE802.3; Correspondingly under the situation that does not have preamble and SFD " Start Frame Delimiter ") extremely unsettled packet size; Wherein, the subject matter about real-time is the maximum data packet size that is about 1500 bytes.If the process of transmitting of packet is disturbed, can't interrupt this process of transmitting more so.These long Ethernet data bags have blocked transmission channel thus in the quite a long time, and make the packet of high priority postpone thus.Therefore, Ethernet data wraps in the time that takies transmission medium under the transmission speed of 100Mbit/s and reaches 125 μ s approximately.After this be ready for transmission immediately and have more that the packet of high priority is also postponed until old packet has been sent fully thus.
Because this delay not only appears at network user's (network equipment, terminal equipment) and locates, and also appear at each network node (for example switch) and locate, so the problems referred to above further worsens.Thus, in the linear topology that is easy to assemble (Linientopologie), long maximum delay time, for example 12.5ms have appearred when 100 equipment of series connection just.The transmission time of packet thus can 0 and 12.5ms between fluctuate, this uses for many real-times and Yan Taida.
In the not enough application of the certainty of those industrial network agreements (like Ethernet-IP, PROFINET IRT) and real-time based on IEEE802.3; These procotols based on Ethernet are identified as the procotol that no longer is applicable to IEEE802.3, and also need be used for the particular component of network components (switch) thus.These required for this reason equipment can not show a candle to according to the standarized component of IEEE802.3 so effective and flexible; In addition, these parts are expensive more, and major part all needs extra special networks configuration and network design.This defective has hindered the expansion of Ethernet in the application that certainty and real-time are had relatively high expectations.Now, the agreement of real-time realizes certainty through all users' high precision time synchronization.Time division multiplexing can realize (PROFINET IRT, be used for time phase of real-time protocol (RTP) and other agreements) through time synchronized, or realizes through in agreement, making up timestamp (Ethernet-IP, Ethercat).Yet itself remains unchanged Ethernet protocol.This proprietary variant (PROFINET IRT, Ethercat, Ethernet Powerlink) that helps the network user's time input is drawn in the enterprising professional etiquette of transmission medium of Ethernet also needs the special hardware among the network node and the network user, and has used the agreement incompatible with IEEE802.3.
Summary of the invention
The objective of the invention is to, meet higher real-time and the certainty of realization degree under the situation of network components of IEEE802.3 in use.
This purpose the beginning said type method aspect in realize thus, promptly at the transmitter place each Ethernet data bag is split into a plurality of Ethernets unit that is called as the Ethernet data bag by Ethernet unit-assembly,
-wherein, receive MAC Address and the VLAN label (label) that is used for the Ethernet unit of the Ethernet data bag that under possible situation, exists,
-wherein, the valid data with ether class parameter and Ethernet data bag record in the data field of Ethernet unit in order,
-wherein, draw the quantity of Ethernet unit according to the size of the amount of valid data and data field,
-wherein, mark the Ethernet unit that can distribute to each Ethernet data bag,
-wherein, in each Ethernet unit, mark out valid data shared byte number in corresponding data field, and
-wherein, each Ethernet unit is identified as the Ethernet unit through ether class parameter,
And by Ethernet unit-assembly a plurality of Ethernet unit combination are become the Ethernet data bag at the receiver place.
This purpose further realizes through this Ethernet unit-assembly and the network equipment with characteristic given in claim 6 or claim 7.
Eliminate the essential reason of the problems referred to above through the Ethernet data bag being split into Ethernet unit (having the obvious littler length of packet size naturally) than maximum, that is, and long Ethernet data bag.Can handle this weak point Ethernet unit with network standard, that meet IEEE802.3 now; Based on present less data packet length, can obviously reduce the delay of the real time data bag of high priority.To this, and to compare based on the real-time protocol (RTP) of Ethernet now, this method does not need the special networks management, and only need carry out small change to terminal equipment.
For split and the process of combination for, what play a decisive role is the clear and definite mark that is used for the correspondence between transmitter and the receiver, in the Ethernet through source-this mark is provided with target MAC (Media Access Control) address.In order to realize real-time performance, at least two priority class must be provided, a message that is used for low priority, and another is used for the message of high priority.For priority class, used the priority bit (IEEE802.1Q) in the VLAN label.Should be sent simultaneously with message high priority owing to low priority, so between transmitter and receiver, all provided two correspondences for the priority of each realization.
The Ethernet unit comprise about the information of the position of unit in packet (for example first, last or between this; Certainly the method for splitting that also has other), this makes the Ethernet unit-assembly at receiver place know when the transmission of packet is accomplished.Because (in last unit) needn't take the data field fully and for example utilize " 0 " to fill up remaining byte, therefore exist about by the information of the byte number in the shared data field of valid data for this reason.
Can be designed for the method that splits and make up like this; Promptly can transmit packet (or unit), thereby can use network components that can on market, buy, that meet IEEE802.3 for network through network common, that meet IEEE802.3.As far as the user, this means significantly lower expense and obvious bigger possible bandwidth.The real-time enforcement of the reality of Ethernet (PROFINET IRT, Ethercat, Ethernet Powerlink ...) most of by the bandwidth constraints of 100Mbit, but ethernet standard provides the bandwidth of 1Gbit or 10Gbit also with low costly during this period.Now can with bigger, 1Gbit or even the bandwidth of 10Gbit use network components, this can realize comparing better real-time property with current special execution mode.
This method of design promptly need not network is carried out special real-time configuration like this.For the user, this network shows as the standard ethernet network that meets IEEE802.3.The structure that meets IEEE802.3 Network Based also can use the every other mechanism and the agreement of standard ethernet, for example redundancy and network management.The user also can use real time communication under the situation of not using clear and definite real-time protocol (RTP).Only need send the real-time packet that it has high priority for this reason.Thus, the user just can avoid at connection possibility (for example, the main frame/subsidiary engine among the PROFINET) aspect the restriction of real-time protocol (RTP) commonly used.
In a favourable make, the Cyclical Redundancy Check of Ethernet data bag (FCS:Frame Check Sequence) also is transferred in the data field of Ethernet unit.In this way, be in the Ethernet unit-assembly at receiver place can be again with former packet reorganization-comprising having the CRC that length is 4 bytes " FCS (Cyclic Redundancy Check) " " Cyclical Redundancy Check (Frame Check Sequence) ".Error of transmission and fractionation-/composition error is through being displayed by the CRC of the variation of former packet, and this acts on ethernet standard mechanism.(single Ethernet unit has-standard compliant-FCS or CRC certainly equally).
In another favourable execution mode, represent the mark and the shared byte number of valid data of the attachment relationship of each Ethernet data bag through different ether class parameters.Through this mode information can be provided, but needn't in original very little data field, memory space be provided for this reason.
In another favourable execution mode, will be as the shared byte number of the mark of the attachment relationship that is used for each Ethernet data bag and valid data with the stored in form of variable data field in each Ethernet unit.In this optional make, although variable has taken the data field of 1 byte, ether class parameter is enough to this Ethernet data bag is marked as the Ethernet unit.This parameter can for example show as fractionation/reorganization-state (SRS) and for example be placed in first byte of data field of Ethernet unit.
In another favourable execution mode, Ethernet data encapsulates to split into has the minimum Ethernet unit that allows length.When transfer rate is 100Mbit/s, come to make the delay that only just has about 6 μ s now (with the maximum Ethernet data bag of transmission time 125 μ s compare) through the Ethernet data bag being shortened to 64 bytes (not having preamble and SFD).Even only also draw 0.6ms (replacing 12.5ms) when therefore in a line, having 100 users.Higher when transfer rate, can also obviously be shortened once more this time of delay naturally.
In favourable make, in the network equipment according to the present invention, Ethernet unit-assembly according to the present invention is disposed between PHY layer (physical layer) and the MAC layer (medium access control layer).The split process in short Ethernet unit and the anabolic process of original Ethernet data bag are logically carried out between PHY layer and MAC layer.On sending direction, the MAC layer is used for each priority class the transmission data flow is provided.When having at least two priority class, the packet of high priority can surpass the packet of the low priority in transmit status.On the direction of receiver, Ethernet unit-assembly receives the Ethernet unit and in memory cell (" Connection RAM "), notes the part that has received of (the Ethernet data bag that is split) packet.If packet is received (that is to say all Ethernet unit of former Ethernet data bag) fully, this packet will be forwarded the layer to MAC so.
Description of drawings
Describe and set forth the present invention in detail by the embodiment shown in the figure below.The figure shows:
The sketch map of the Ethernet unit-assembly in the network interface.
Embodiment
This illustrates Ethernet unit-assembly 1 is integrated into the situation in the data flow of standard ethernet interface of the network equipment.Importantly this Ethernet unit-assembly 1 only is only necessity for user's connection of network, and in addition, this network that has switch conforms to IEEE802.3 fully.
Make progress in sender side, MAC layer 6 provides the transmission data flow for each priority class.When having at least two priority class (as shown in the figure), the packet of high priority can have precedence over the packet of the low priority in transmit status; If there are not other words of priority class, the packet that must continue to send so sends and finishes.The transmitting element 2 of Ethernet unit-assembly 1 has been divided into short Ethernet unit with long Ethernet data bag now, and correspondingly sends the Ethernet unit that these have limit priority.
On receive direction, the receiving element 3 of Ethernet unit-assembly 1 receives the Ethernet unit and in memory cell 4 (" Connection RAM "), notes the part that has received of packet.If packet is received fully, just so it is transmitted to MAC layer 6.If when having " common " (long, do not split) Ethernet data bag in the network, so directly with its forwarding.Though common Ethernet data bag can produce harmful effect to the real-time of network, but still can handle through the network that has Ethernet unit-assembly 1.
Since now the packet in network obviously short for example; The ethernet frame minimum value is 64 bytes (not having preamble and SFD); Even if 100 users are transmitted the delay that has also only produced about 6 μ s/ nodes so now on the line of 600 μ s only.Ethernet unit-assembly 1 in user's connection, remaining all-network infrastructure all meets IEEE802.3.Owing to can confirm priority according to each short packages, the control of the priority in the VLAN label now also is effective.
The Ethernet unit itself is to meet packet IEEE802.3, that ethernet type is fixed fully, and this packet is called as the Ethernet unit.Valid data comprise the valid data that split by fractionation/reorganization-state (SRS) and part.SRS also can alternately realize through different EtherTypes.For split-with reorganization-process for, what play a decisive role is the clear and definite mark that is used for the correspondence between transmitter and receiver, in Ethernet through the source-and target MAC (Media Access Control) address this mark is provided.In order to realize real-time performance, at least two priority class must be provided, a message that is used for low priority, another is used for the message of high priority.As far as priority class, use be the priority bit (IEEE802.1Q) in the VLAN label.Because the message that message that priority is low and priority are high should be sent simultaneously, so between transmitter and receiver, provided two correspondences for the priority of each realization.The Ethernet message (packet) that does not have the VLAN label is split by the transmitting element 2 of Ethernet unit-assembly 1, and still being divided into does not certainly have the Ethernet of VLAN label unit.There is not the Ethernet unit (or-packet) of VLAN label to have minimum priority.The VLAN label is unimportant for fractionation, and it is necessary as far as the preferential of Ethernet message (packet), for example RT-message only.
To set forth the method that the Ethernet data bag of 200 bytes is divided into the Ethernet unit of 64 bytes below.Selected fractionation mode and SRS structure only are exemplary.The Ethernet data bag that has 200 byte valid data comprises in addition and is respectively 6 byte MAC source addresses and destination address, the VLAN label of 4 bytes, the ether class parameter 2 of 2 bytes; And except valid data, also comprise FCS, FCS or the CRC of 4 bytes in addition, that is to say 222 bytes altogether.Except valid data, the necessary byte of transmission also is present in the Ethernet unit certainly, thereby makes and in integral body is the length of 64 bytes, also leave 42 bytes for the data field, 1 byte wherein is shared by SRS.
SRS comprise now with packet in the relevant information in the position (" First ", " Body ", " Last ") of Ethernet unit and data field in the byte number that transmits.Since the data field the byte that can comprise less than 41 bytes and fill up remaining byte (" Padding ") with " 0 " for this reason, so SRS is necessary.The CRC (206 byte) of valid data, ether class parameter and former packet is housed in six Ethernet unit.Because the data field of 5 Ethernet unit that size is minimum only can hold 205 bytes, so last Ethernet unit only can transmit 1 byte, and can't equally with unit before transmit 41 bytes.Because for scheme according to the present invention, the Ethernet unit needn't have the for example entire length of 64 byte fixed qties, so also possibly make the 5th Ethernet unit be longer than 1 byte alternatively.The length of these unit possibly possibly still can provide enough little delay for the Ethernet message of high priority thus all the time for example between 64 and 80 bytes.
The data record that meaningfully need of Ethernet data bag is split according to the order of its " appearance " is in the data field of Ethernet unit; That is to say; In the data field of 41 byte-sized of the first Ethernet unit, write down 39 byte valid data of ether class parameter (2 byte) and Ethernet data bag, and in three Ethernet unit subsequently, write down the valid data of 41 bytes respectively.The 5th Ethernet unit optionally transmit the valid data of remaining 38 bytes and also have the FCS of 3 bytes of Ethernet data bag (having kept minimal data bag size thus) or except valid data, also transmitted FCS whole 4 bytes (make thus packet expanded in size 1 byte to 65 bytes).Under first kind of situation, also need naturally (as top as described in) be used for transmitting Unit the 6th of last FCS byte, wherein, utilize zero to fill up remaining data field.Utilize this method can the Ethernet unit-assembly 1 that be made up of five or six Ethernet unit be reassembled into original packet again.The unchanged CRC of former packet will demonstrate error of transmission and fractionation-/recombination error and these mistakes act on ethernet standard mechanism.
The former Ethernet data bag that sends 200 bytes needs 222 bytes altogether.This packet will be divided into five Ethernet unit through fractionation; Wherein preceding four unit correspondingly are 64 bytes; Unit the 5th is 65 bytes, maybe this packet is divided into six unit that are respectively 64 bytes, will send 321 bytes or 384 bytes so now altogether.Owing to used the high pass throughput rate of 100Mbit (or even reach 10Gbit), be problem so no longer will improve that about 50% of data volume regards as now.Owing to can not time slot be used up fully, therefore now based on the Ethernet modification of time-multiplexed real-time can not realization theory on possible transmission quantity.Because the restriction that the actual real-time application major part of Ethernet is received the bandwidth of 100Mbit; So through using the network components with bigger bandwidth that better real-time property is provided possibly, this real-time is superior to the real-time in the special applications now usually now.
In sum, the present invention relates to a kind of method of between transmitter and receiver, transmitting at least one Ethernet data bag, a kind of being used to implemented device according to the method for the invention, and a kind of network equipment with this device.The real-time and the certainty that are issued to higher degree for the situation that meets the network components of IEEE802.3 in use propose: each Ethernet data bag at transmitter place is split into a plurality of Ethernets unit of so-called Ethernet data bag and at the receiver place it reconfigured.Through the Ethernet data bag being split into Ethernet unit (length that has the maximum data packet size of being significantly less than naturally), the delay of the real time data bag of high priority will be significantly shorter than Ethernet data bag long, that do not split.
Claims (8)
1. the method for at least one Ethernet data bag of transmission between transmitter and receiver is characterized in that,
At said transmitter place each Ethernet data bag is split into a plurality of Ethernets unit that is called as said Ethernet data bag by Ethernet unit-assembly (1),
-wherein, receive MAC Address and the VLAN label that is used for said Ethernet unit of the said Ethernet data bag that under possible situation, exists,
-wherein, the valid data with ether class parameter and Ethernet data bag record in the data field of said Ethernet unit in order,
-wherein, draw the quantity of said Ethernet unit according to the size of the amount of said valid data and said data field,
-wherein, mark the said Ethernet unit that can distribute to each said Ethernet data bag,
-wherein, in each Ethernet unit, mark out said valid data shared byte number in corresponding data field, and
-wherein, each Ethernet unit is identified as said Ethernet unit through said ether class parameter,
And by Ethernet unit-assembly (1) a plurality of Ethernet unit combination are become said Ethernet data bag at said receiver place.
2. method according to claim 1, wherein, the Cyclical Redundancy Check of said Ethernet data bag is also recorded in the said data field of said Ethernet unit.
3. method according to claim 1 and 2 wherein, is represented the mark and the shared byte number of said valid data of the attachment relationship of each Ethernet data bag through different ether class parameters.
4. method according to claim 1 and 2; Wherein, will be as the shared said byte number of the said mark of the said attachment relationship that is used for each Ethernet data bag and said valid data with the stored in form of variable said data field in each Ethernet unit.
5. each described method in requiring according to aforesaid right, wherein, said Ethernet data encapsulates to split into has the minimum Ethernet unit that allows length.
6. an Ethernet unit-assembly (1); Have and be used for carrying out instrument according to each described method of aforesaid right requirement; Said Ethernet unit-assembly has transmitting element (2), receiving element (3) and memory cell (4) at least; By said transmitting element the Ethernet data bag is split into the Ethernet unit, can said Ethernet unit combination be become said Ethernet data bag by said receiving element.
7. a network equipment that is used to send and/or receive the Ethernet data bag is characterized in that a kind of Ethernet unit-assembly according to claim 6 (1).
8. the network equipment according to claim 7, wherein, said Ethernet unit-assembly (1) is arranged between PHY layer (5) and the MAC layer (6).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010000995.4 | 2010-01-19 | ||
| DE102010000995A DE102010000995B3 (en) | 2010-01-19 | 2010-01-19 | Increasing the real-time capability of Ethernet networks |
| PCT/EP2010/070839 WO2011088956A1 (en) | 2010-01-19 | 2010-12-29 | Increasing the real-time capability of ethernet networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102714612A true CN102714612A (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800619098A Pending CN102714612A (en) | 2010-01-19 | 2010-12-29 | Increasing the real-time capability of Ethernet networks |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2526654A1 (en) |
| CN (1) | CN102714612A (en) |
| DE (1) | DE102010000995B3 (en) |
| RU (1) | RU2012135470A (en) |
| WO (1) | WO2011088956A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410585A (en) * | 2014-09-12 | 2015-03-11 | 云南电网公司 | Ethernet information real-time transmission method and device |
| CN104717189A (en) * | 2013-12-16 | 2015-06-17 | 中兴通讯股份有限公司 | Network data package sending method and device |
| CN112399381A (en) * | 2020-10-29 | 2021-02-23 | 华人运通(江苏)技术有限公司 | Data transmission method and vehicle-mounted Ethernet transmission system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9705700B2 (en) * | 2014-10-21 | 2017-07-11 | Cisco Technology, Inc. | Sparse graph coding scheduling for deterministic Ethernet |
| CN112202574A (en) * | 2020-10-13 | 2021-01-08 | 中车大连电力牵引研发中心有限公司 | Multi-port hard real-time Ethernet switching device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1501640A (en) * | 2002-11-14 | 2004-06-02 | 北京润光泰力科技发展有限公司 | Method and system for transmitting Ethernet data using multiple E1 lines |
| US20080071924A1 (en) * | 2005-04-21 | 2008-03-20 | Chilukoor Murali S | Interrupting Transmission Of Low Priority Ethernet Packets |
| CN101364932A (en) * | 2007-08-07 | 2009-02-11 | 普然通讯技术(上海)有限公司 | Data segment transmission method for packet-switching network |
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| WO2002058350A1 (en) * | 2001-01-19 | 2002-07-25 | Net To Net Technologies | Dynamic time division multiplexing of voice signals into ethernet data streams over a wan circuit |
| US7224703B2 (en) * | 2001-12-12 | 2007-05-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for segmenting a data packet |
| US20080056295A1 (en) * | 2006-09-01 | 2008-03-06 | Dne Technologies, Inc. | Internet protocol quality of service apparatus and method |
-
2010
- 2010-01-19 DE DE102010000995A patent/DE102010000995B3/en not_active Expired - Fee Related
- 2010-12-29 CN CN2010800619098A patent/CN102714612A/en active Pending
- 2010-12-29 RU RU2012135470/08A patent/RU2012135470A/en not_active Application Discontinuation
- 2010-12-29 EP EP10799056A patent/EP2526654A1/en not_active Withdrawn
- 2010-12-29 WO PCT/EP2010/070839 patent/WO2011088956A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1501640A (en) * | 2002-11-14 | 2004-06-02 | 北京润光泰力科技发展有限公司 | Method and system for transmitting Ethernet data using multiple E1 lines |
| US20080071924A1 (en) * | 2005-04-21 | 2008-03-20 | Chilukoor Murali S | Interrupting Transmission Of Low Priority Ethernet Packets |
| CN101364932A (en) * | 2007-08-07 | 2009-02-11 | 普然通讯技术(上海)有限公司 | Data segment transmission method for packet-switching network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717189A (en) * | 2013-12-16 | 2015-06-17 | 中兴通讯股份有限公司 | Network data package sending method and device |
| CN104410585A (en) * | 2014-09-12 | 2015-03-11 | 云南电网公司 | Ethernet information real-time transmission method and device |
| CN112399381A (en) * | 2020-10-29 | 2021-02-23 | 华人运通(江苏)技术有限公司 | Data transmission method and vehicle-mounted Ethernet transmission system |
| CN112399381B (en) * | 2020-10-29 | 2023-09-15 | 华人运通(江苏)技术有限公司 | Data transmission method and vehicle-mounted Ethernet transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011088956A1 (en) | 2011-07-28 |
| RU2012135470A (en) | 2014-02-27 |
| DE102010000995B3 (en) | 2011-06-16 |
| EP2526654A1 (en) | 2012-11-28 |
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Application publication date: 20121003 |