CN101605027B - Method and device for synchronizing packet sending intervals - Google Patents
Method and device for synchronizing packet sending intervals Download PDFInfo
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- CN101605027B CN101605027B CN2009101581218A CN200910158121A CN101605027B CN 101605027 B CN101605027 B CN 101605027B CN 2009101581218 A CN2009101581218 A CN 2009101581218A CN 200910158121 A CN200910158121 A CN 200910158121A CN 101605027 B CN101605027 B CN 101605027B
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Abstract
The invention discloses a method and a device for synchronizing packet sending intervals. The method includes that the device receives the CCI synchronous packet communicating sending time intervals of detection packets in the maintenance domain and the maintenance collection where the device is located, wherein the CCI synchronous packet includes marks of maintenance region and maintenance collection and novel CCI; the device determines whether to update the local CCI based on marks of maintenance region and maintenance collection carried by the CCI synchronous packet and novel CCI; if the determination result is to update, the device updates the local CCI to the novel CCI, and sends CCI synchronous packets and communicating detection packet using the novel CCI to other devices in the maintenance region and the maintenance collection. According to the invention, the device in the maintenance region and the maintenance collection rapidly regulates CCI of all devices in the maintenance region and the maintenance collection by transceiving CCI synchronous packets carrying novel CCI, thereby enhances speed and efficiency of CCI regulation.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and apparatus of synchronizing packet sending intervals.
Background technology
Ethernet technology is in the success in local area network (LAN) field, with and dispose simple, safeguard simple advantage, impel service provider, equipment manufacturers and standardization body that ethernet technology is advanced to metropolitan area network and wide area network field.But ethernet technology enters the major obstacle that the operator field faces and lacks effective maintenance and management instrument exactly, so connected trouble management (CFM, Connectivity Fault Management) is arisen at the historic moment.
CFM provides detection of connectivity end to end, mainly two layers of interconnect services that operator is provided are carried out the link monitoring and the fault detect of layering, mainly comprise three kinds of functions: communication with detection (CC, ConnectivityCheck), loopback (LB, Loop Back) and link trace (LT, Link Trace).
CC is by safeguarding collection boundary point (MEP, Maintenance association End Point) periodically sends communication with detection message (CCM, Connectivity Check Message) message, all and this MEP belong to same maintenance field (MD, Maintenance Domain) and safeguard collection (MA, Maintenance Association) far-end MEP can receive this CCM message under the situation that link is communicated with, if far-end MEP does not receive the CCM message that certain MEP sends in continuous three cycles, then think and this MEP between link problem has appearred.
Can also detect various link defectives by CC function CF M, comprise: defectives such as CCM message dropping, CCM message mistake, CCM message intersection.By CFM rich functions and perfect link failure management, can satisfy the maintenance needs of ethernet technology in metropolitan area network and wan environment well.
In order to satisfy the communication with detection accuracy requirement in various degree of different operators, IEEE802.1ag-2007 agreement regulation, MEP can send the CCM message of 7 kinds of different frequencies, can reach 300 CCM messages of per second the soonest, 1 CCM message of transmission in the slowest then per 600 seconds.
The cycle of the CCM message that MEP sends is decided by the time interval territory in the CCM message (interval territory), such as, the interval territory is 1 o'clock, MEP sends 1 CCM (frequency is 300Hz) for per 3.33 milliseconds, the interval territory is 4 o'clock, MEP sent 1 CCM in per 1 second, and interval is 7 o'clock, and MEP sent 1 CCM in per 600 seconds.
During existing protocol is realized, be in same maintenance field on the distinct device and safeguard the maintaining end point of concentrating, its time interval that sends the CCM message must be identical.If inequality, two ends MEP then inequality thinks the other side's link failure.
Be in same maintenance field in the carrier network and safeguard that the number of devices of concentrating is a lot of usually,, need often to revise the time precision of the fault detect of safeguarding all devices of concentrating, promptly revise the CCI of all devices because network operation needs.This modification is normally manual to be configured every equipment successively.Obviously, the time-consuming consumption power of this manual configuration mode, along with the increase of number of devices, the increase that all can be directly proportional of manpower and time consumption; And the configuration that is easy to omit some equipment, if omitting the CCI of some equipment revises, meeting causes between the equipment that other equipment are and these leakages are joined and takes for network failure because safeguard the difference of CCI in the collection, brings unnecessary network operation workload thus; Has all revised safeguard CCI all in the collection before, safeguard the difference of CCI in the collection because the overtime neighbours of causing of CC are interrupted, bring unnecessary alarm thus or generation link switchover because of linking.
According to above-mentioned analysis, the inventor thinks and has following shortcoming in the prior art at least:
The manual configuration mode causes the speed of equipment CCI slow, revises inefficiency, thereby causes unnecessary network failure easily.
Summary of the invention
The invention provides a kind of method and apparatus of synchronizing packet sending intervals, to realize realizing fast that by between equipment, sending the CCI sync message CCI of equipment in the maintenance field adjusts.
The invention provides a kind of method of synchronizing packet sending intervals, comprising:
Equipment receives the maintenance field at described equipment place and safeguards the transmission time interval CCI sync message of the communication with detection message in the collection, carries maintenance field in the described CCI sync message and safeguards set identifier and new CCI;
Described equipment is according to the maintenance field that carries in the described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI;
If described judged result is for upgrading, described equipment is updated to described new CCI with the CCI of described this locality, sends CCI sync message and communication with detection message with described new CCI to the described maintenance field and other equipment in the collection of safeguarding.
Described equipment receives the maintenance field at described equipment place and safeguards that the transmission time interval CCI sync message of the communication with detection message in the collection comprises:
Described equipment receives the maintenance field and the CCI sync message of safeguarding in the collection at the described equipment place of configuration; Perhaps
Described equipment receives the maintenance field at described equipment place and safeguards the CCI sync message that other equipment send in the collection.
Described equipment is according to the maintenance field that carries in the described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI and comprise:
Described equipment obtains the maintenance field that carries in the described CCI sync message and safeguards set identifier;
Described equipment is with the maintenance field of this locality and safeguard the maintenance field that carries in set identifier and the described CCI sync message and safeguard that set identifier compares;
If comparative result is different, described equipment judged result is upgraded for refusal;
If comparative result is identical, whether the more described original CCI of described equipment is identical with described new CCI: if identical, described equipment judged result is upgraded for refusal; If different, described equipment judged result is for upgrading.
Also comprise:
When described judged result was upgraded for refusal, described equipment abandoned described CCI sync message.
Described equipment is updated to the CCI of described this locality before the described new CCI, also comprises:
Described equipment sends the described CCI sync message of predetermined quantity with the CCI of described this locality.
Described equipment is specially with the CCI sync message that original CCI sends described predetermined quantity:
Described equipment sends the CCI sync message of described predetermined quantity with original CCI to the maintenance field at described equipment place and other equipment in the collection of safeguarding, described predetermined quantity is determined according to the CCI time out period.
A kind of equipment of synchronizing packet sending intervals comprises:
The message receiving element, the transmission time interval CCI sync message that is used to receive the maintenance field at described equipment place and safeguards the communication with detection message in the collection carries maintenance field and safeguards set identifier and new CCI in the described CCI sync message;
Upgrade judging unit, be used for the maintenance field that carries according to described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI;
Packet sending unit, the judged result that is used for described renewal judging unit is when upgrading, the CCI of described this locality is updated to described new CCI, sends CCI sync message and communication with detection message to the described maintenance field and other equipment in the collection of safeguarding with described new CCI.
Described message receiving element specifically is used for:
Receive the maintenance field and the CCI sync message of safeguarding in the collection at the described equipment place of configuration; Perhaps
Receive the maintenance field at described equipment place and safeguard the CCI sync message that other equipment send in the collection.
Described renewal judging unit specifically is used for:
Obtain the maintenance field that carries in the described CCI sync message and safeguard set identifier;
With the maintenance field of this locality with safeguard the maintenance field that carries in set identifier and the described CCI sync message and safeguard that set identifier compares;
If comparative result is different, judged result is upgraded for refusal;
If comparative result is identical, whether more described original CCI is identical with described new CCI: if identical, judged result is upgraded for refusal; If different, judged result is for upgrading.
Also comprise:
The packet loss unit when judged result that is used for described renewal judging unit is the refusal renewal, abandons described CCI sync message.
Described packet sending unit also is used for: before the CCI with described this locality is updated to described new CCI, send the described CCI sync message of predetermined quantity with the CCI of described this locality.
Compared with prior art, the present invention has the following advantages at least:
Among the present invention, the maintenance field and the equipment in the collection of safeguarding carry the CCI sync message of new CCI by transmitting-receiving, and rapid adjustment maintenance field and safeguard the CCI of all devices in the collection has improved speed and efficient that CCI adjusts, help conserve network resources, avoid unnecessary network failure.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for synchronizing packet sending intervals provided by the invention;
Fig. 2 is the schematic flow sheet of the method for the synchronizing packet sending intervals that provides in the application scenarios of the present invention;
Fig. 3 is the structural representation of the equipment of the synchronizing packet sending intervals that provides in the application scenarios of the present invention.
Embodiment
In order to solve the problem that manual setting CCI speed in the prior art causes occurring unnecessary network failure excessively slowly, the invention provides a kind of method of synchronizing packet sending intervals, carry out same maintenance field and safeguard the adjustment that collects interior CCI by transmitting-receiving CCI sync message.The user is maintenance field and safeguards the new CCI of a certain original equipment configuration that collection is interior that this original equipment sends the CCI sync message that carries new CCI with original CCI, also carries maintenance field in this CCI sync message and safeguards the identification information that collects.The equipment that receives the CCI sync message is according to the maintenance field that carries in the CCI sync message and safeguard the identification information of collection and new CCI, upgrades local CCI, realizes unified maintenance field and safeguards the rapid adjustment of CCI in the collection.
The invention provides a kind of method of synchronizing packet sending intervals, as shown in Figure 1, comprising:
Step s101, equipment receive the maintenance field at described equipment place and safeguard the transmission time interval CCI sync message of the communication with detection message in the collection, carry maintenance field in the described CCI sync message and safeguard set identifier and new CCI;
Step s102, described equipment are according to the maintenance field that carries in the described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI;
Step s103, if described judged result is renewal, described equipment is updated to described new CCI with the CCI of described this locality, sends CCI sync message and communication with detection message with described new CCI to the described maintenance field and other equipment in the collection of safeguarding.
Introduce the method for synchronizing packet sending intervals provided by the invention in detail below in conjunction with concrete application scenarios, as shown in Figure 2, may further comprise the steps:
Step s201, configuration CCI sync message on original equipment.
Concrete, this CCI sync message is a kind of CFM protocol massages, the similar CCM message of this message, can be in the VLAN of maintenance field place multicast, to guarantee that all devices can both be received this message in the maintenance field.
The form of this CCI sync message is as shown in table 1:
Table 1
0 1 2 3
0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|?Level?| Version | Type |RDI|Reserved|CCI| MAID
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MAID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MAID | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
In the table 1, the implication of each field is as follows in the CCI sync message:
1) Version field: back 5 bit of the 1st byte are Version, all are 0 at present;
2) Level field: preceding 3 bit of the 1st byte are Level, indicate the rank of maintenance field.
3) the type field: Type=10 is in the 2nd byte, illustrates that message is the CCI sync message that increases newly.
4) RDI field: the 1st bit of the 3rd byte is RDI, and the FNG state machine is 1 when being NOCCM, and remaining situation is 0.
5) Reserved field: the 2nd to the 5th bit of the 3rd byte is reserved field, is 0 at present.
6) CCI field: back 3 bit of the 3rd byte are cc interval fields, the CCI sync message just tell same maintenance field with this field and safeguard other concentrated equipment should be synchronous purpose CCinterval.
7) MAID field: the 4th to the 51st byte is the MAID field, and totally 48 bytes mainly comprise Format and the Length (each 1 byte) of MD and MA and MD and MA title (both add up and are no more than 44 bytes, and insufficient section is filled with 0).
8) Reserved field: reserved field.
With CCI field original in the CCI sync message is 4 to be example, and according to the corresponding relation of CCI field and time in the prior art, the CCI field is that the original CCI of 4 expressions is 1 second.If the user needs this CCI is revised as 100 milliseconds, then according to the corresponding relation of CCI field and time, the CCI field that the user need dispose on equipment in this message is 3, specifically can select configuration mode as required flexibly, for example can adopt order line in original equipment, to import CCI field 3, finish configuration CCI new in the original equipment.
Step s203, original equipment sends the CCM message with new CCI.
After original equipment obtains new CCI configuration, send CCI sync message and CCM message according to the non-original equipment of this new CCI configuration in maintenance field and maintenance collection.In the process that sends CCI sync message and CCM message, original equipment can also receive the CCI sync message that other equipment send, at this moment, original equipment is identical to the processing procedure of the CCI sync message that receives with non-original equipment to the processing procedure of the CCI sync message that receives.
Concrete, non-original equipment is seen step s204-step s208 to the processing procedure of CCI sync message.
Step s204, non-original equipment receives the CCI sync message, obtains the maintenance field that carries in this CCI sync message and safeguards set identifier, with this maintenance field with safeguard that set identifier is with local maintenance field with safeguard that set identifier compares; If the comparative result difference, execution in step s205; If comparative result is identical, execution in step s206.
Step s205, non-original equipment abandon the CCI sync message that receives.
Whether the new CCI that carries among the step s206, the more original CCI of non-original equipment and CCI sync message is identical; If identical, execution in step s205; If different, execution in step s208.
Step s208, non-original equipment is revised local CCI with the CCI in the CCI sync message, sends CCI sync message and CCM message with new CCI.
Should before step s203, can also comprise with in the scene:
Step s202, original equipment send the CCI sync message and the CCM message of predetermined quantity with original CCI.
Before step s208, can also comprise:
Step s207, non-original equipment send the CCI sync message and the CCM message of predetermined quantity with original CCI.
Increase above-mentioned two steps former because:
Shown in the integrating step s208, equipment in maintenance field and the maintenance collection is after receiving the CCI sync message, can send the CCI sync message to other equipment, be that the maintenance field and the equipment in the collection of safeguarding can send the CCI sync message mutually, make the maintenance field and the equipment in the collection of safeguarding finish new CCI configuration fast.Consider maintenance field and safeguard that the interior equipment of collection need send the CCM message and keep normal neighborhood, with any two device A and B is example, if A does not receive the CCM message that B sends in continuous 3 cycles, then the A judgement makes mistakes with the neighborhood of B equipment, so, cause A to judge and the link failure of B that A can send the CCM message of predetermined quantity with original CCI to B before sending the CCM message with new CCI for fear of asynchronism(-nization) owing to A and B adjustment CCI.
Concrete, the value of this predetermined quantity can be determined according to the CCI time out period, for example can be set to 3.A sends 3 CCI sync messages and CCM message with original CCI to B behind configuration CCI sync message; B receives the CCM message that A sends, and the neighborhood between judgement and the A is normal, and sends the CCM message with original CCI to A.Owing to the time of CCM message interaction between A, the B is very short usually, so A does not finish the renewal of CCI as yet when receiving the CCM message of B transmission, and the judgement of CCM message and the neighborhood between the B that send according to B are normal.After A, B upgraded local CCI respectively, A, B sent the CCM message with new CCI to the other side respectively, and judged that according to the CCI after upgrading neighborhood is normal, thereby kept normal neighborhood between A, the B.
Should be with in the scene, the value of predetermined quantity can but be not limited to 3, can be provided with flexibly according to actual needs.
By adopting method provided by the invention, the maintenance field and the equipment in the collection of safeguarding carry the CCI sync message of new CCI by transmitting-receiving, realize the rapid adjustment of the CCI of all devices, have improved speed and efficient that CCI adjusts, help conserve network resources, avoid unnecessary fault.
The invention provides a kind of equipment of synchronizing packet sending intervals, as shown in Figure 3, comprising:
Upgrade judging unit 12, be used for the maintenance field that carries according to described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI; This renewal judging unit 12 specifically is used for: obtain the maintenance field that described CCI sync message carries and safeguard set identifier; With the maintenance field of this locality with safeguard the maintenance field that carries in set identifier and the described CCI sync message and safeguard that set identifier compares; If comparative result is different, judged result is upgraded for refusal; If comparative result is identical, whether more described original CCI is identical with described new CCI: if identical, judged result is upgraded for refusal; If different, judged result is for upgrading.
In the equipment provided by the invention, optionally, can also comprise:
Described packet sending unit 11 can also be used for: before the CCI with described this locality is updated to described new CCI, send the described CCI sync message of predetermined quantity with original C CI.
By adopting equipment provided by the invention, the same maintenance field and the equipment in the collection of safeguarding carry the CCI sync message of new CCI by transmitting-receiving, realize the rapid adjustment of the CCI of all devices, have improved speed and efficient that CCI adjusts, help conserve network resources, avoid unnecessary fault.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (11)
1. the method for a synchronizing packet sending intervals is characterized in that, comprising:
Equipment receives the maintenance field at described equipment place and safeguards the transmission time interval CCI sync message of the communication with detection message in the collection, carries maintenance field in the described CCI sync message and safeguards set identifier and new CCI;
Described equipment is according to the maintenance field that carries in the described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI;
If described judged result is for upgrading, described equipment is updated to described new CCI with the CCI of described this locality, sends CCI sync message and communication with detection message with described new CCI to the described maintenance field and other equipment in the collection of safeguarding.
2. the method for claim 1 is characterized in that, described equipment receives the maintenance field at described equipment place and safeguards that the transmission time interval CCI sync message of the communication with detection message in the collection comprises:
Described equipment receives the maintenance field and the CCI sync message of safeguarding in the collection at the described equipment place of configuration; Perhaps
Described equipment receives the maintenance field at described equipment place and safeguards the CCI sync message that other equipment send in the collection.
3. method as claimed in claim 1 or 2 is characterized in that, described equipment is according to the maintenance field that carries in the described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI and comprise:
Described equipment obtains the maintenance field that carries in the described CCI sync message and safeguards set identifier;
Described equipment is with the maintenance field of this locality and safeguard the maintenance field that carries in set identifier and the described CCI sync message and safeguard that set identifier compares;
If comparative result is different, described equipment judged result is upgraded for refusal;
If comparative result is identical, whether the more described original CCI of described equipment is identical with described new CCI: if identical, described equipment judged result is upgraded for refusal; If different, described equipment judged result is for upgrading.
4. method as claimed in claim 3 is characterized in that, also comprises:
When described judged result was upgraded for refusal, described equipment abandoned described CCI sync message.
5. method as claimed in claim 1 or 2 is characterized in that, described equipment is updated to the CCI of described this locality before the described new CCI, also comprises:
Described equipment sends the described CCI sync message of predetermined quantity with the CCI of described this locality.
6. method as claimed in claim 5 is characterized in that, described equipment is specially with the CCI sync message that original CCI sends described predetermined quantity:
Described equipment sends the CCI sync message of described predetermined quantity with original CCI to the maintenance field at described equipment place and other equipment in the collection of safeguarding, described predetermined quantity is determined according to the CCI time out period.
7. the equipment of a synchronizing packet sending intervals is characterized in that, comprising:
The message receiving element, the transmission time interval CCI sync message that is used to receive the maintenance field at described equipment place and safeguards the communication with detection message in the collection carries maintenance field and safeguards set identifier and new CCI in the described CCI sync message;
Upgrade judging unit, be used for the maintenance field that carries according to described CCI sync message and safeguard that set identifier and new CCI judge whether to upgrade local CCI;
Packet sending unit, the judged result that is used for described renewal judging unit is when upgrading, the CCI of described this locality is updated to described new CCI, sends CCI sync message and communication with detection message to the described maintenance field and other equipment in the collection of safeguarding with described new CCI.
8. equipment as claimed in claim 7 is characterized in that, described message receiving element specifically is used for:
Receive the maintenance field and the CCI sync message of safeguarding in the collection at the described equipment place of configuration; Perhaps
Receive the maintenance field at described equipment place and safeguard the CCI sync message that other equipment send in the collection.
9. as claim 7 or 8 described equipment, it is characterized in that described renewal judging unit specifically is used for:
Obtain the maintenance field that carries in the described CCI sync message and safeguard set identifier;
With the maintenance field of this locality with safeguard the maintenance field that carries in set identifier and the described CCI sync message and safeguard that set identifier compares;
If comparative result is different, judged result is upgraded for refusal;
If comparative result is identical, whether more described original CCI is identical with described new CCI: if identical, judged result is upgraded for refusal; If different, judged result is for upgrading.
10. equipment as claimed in claim 9 is characterized in that, also comprises:
The packet loss unit when judged result that is used for described renewal judging unit is the refusal renewal, abandons described CCI sync message.
11., it is characterized in that described packet sending unit also is used for: before the CCI with described this locality is updated to described new CCI, send the described CCI sync message of predetermined quantity with the CCI of described this locality as claim 7 or 8 described equipment.
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| CN2009101581218A CN101605027B (en) | 2009-07-13 | 2009-07-13 | Method and device for synchronizing packet sending intervals |
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|---|---|---|---|
| CN2009101581218A CN101605027B (en) | 2009-07-13 | 2009-07-13 | Method and device for synchronizing packet sending intervals |
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| CN101605027B true CN101605027B (en) | 2011-11-16 |
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| CN106209337B (en) * | 2015-04-29 | 2019-10-15 | 中国移动通信集团公司 | A kind of time synchronization message sends frequency self-adaption method, device and equipment |
| CN109474446B (en) * | 2017-09-08 | 2021-11-19 | 中兴通讯股份有限公司 | Method and device for negotiating synchronization |
| CN115001944A (en) * | 2022-05-26 | 2022-09-02 | 苏州盛科通信股份有限公司 | CCM detection period modification method and device, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472714A (en) * | 1983-01-21 | 1984-09-18 | Econolite Control Products, Inc. | Clock synchronization circuit for control of traffic signals |
| CN101068185A (en) * | 2007-06-19 | 2007-11-07 | 中兴通讯股份有限公司 | Ether loop net message processing method and Ethernet protecting system using the same method |
| CN101075965A (en) * | 2007-06-22 | 2007-11-21 | 中兴通讯股份有限公司 | Method for controlling message classified transmission by Ethernet |
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2009
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472714A (en) * | 1983-01-21 | 1984-09-18 | Econolite Control Products, Inc. | Clock synchronization circuit for control of traffic signals |
| CN101068185A (en) * | 2007-06-19 | 2007-11-07 | 中兴通讯股份有限公司 | Ether loop net message processing method and Ethernet protecting system using the same method |
| CN101075965A (en) * | 2007-06-22 | 2007-11-21 | 中兴通讯股份有限公司 | Method for controlling message classified transmission by Ethernet |
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