CN102739389A - Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network - Google Patents
Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network Download PDFInfo
- Publication number
- CN102739389A CN102739389A CN2012101943333A CN201210194333A CN102739389A CN 102739389 A CN102739389 A CN 102739389A CN 2012101943333 A CN2012101943333 A CN 2012101943333A CN 201210194333 A CN201210194333 A CN 201210194333A CN 102739389 A CN102739389 A CN 102739389A
- Authority
- CN
- China
- Prior art keywords
- upstream device
- tracks
- time synchronized
- clock
- performance parameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000006855 networking Effects 0.000 claims abstract description 30
- 238000011144 upstream manufacturing Methods 0.000 claims description 121
- 230000001360 synchronised effect Effects 0.000 claims description 70
- 230000009191 jumping Effects 0.000 claims description 43
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 230000000593 degrading effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a method and a system for multi-GM (Grand Master) equipment time synchronization in a packet transport network. The method comprises the following steps of: deploying a plurality of grand masters GM in a networking; and selecting one GM from a plurality of GMs to be tracked according to a pre-set time synchronization strategy by downstream equipment. The system comprises a GM deploying module and one or more downstream equipment, wherein the grand master GM deploying module is used for deploying the plurality of GMs in the networking; and the downstream equipment is used for selecting one GM from the plurality of GMs to be tracked according to the pre-set time synchronization strategy. According to the method and the system disclosed by the invention, a multi-GM time synchronization manner concept is introduced and the downstream equipment does not rigidly track the same GM at the same time, so that the networking limiting problem caused by a single-GM time synchronization manner and the problem that a time accumulated error of the downstream equipment is large in the large-sized networking can be solved; and the flexibility of the networking is increased and the time synchronization performance of the equipment is improved.
Description
Technical field
The present invention relates to the communications field, be specifically related to the method and system of many GM in a kind of Packet Transport Network (GrandMaster, root clock) equipment time synchronized.
Background technology
In Packet Transport Network, the function of equipment room root synchronizing clock time is absolutely necessary, and uses the 1588v2 agreement to realize the function of time root clock synchronization mostly.
In the 1588v2 standard, because the restriction of data set comparison algorithm only can be supported single GM (GrandMaster, root clock) time synchronizing method, all devices is followed the tracks of same GM root clock simultaneously in the promptly whole network at present.If current main GM root clock is normal; Do not have device tracking and be equipped with GM root clock; If current main GM root clock breaks down; Upstream device just can all be followed the tracks of subsequent use GM root clock, but also only supports single GM time synchronizing method this moment, and promptly all upstream devices are all followed the tracks of same GM root clock.Single GM time synchronizing method has obvious defects in large-scale network environment; It is actual because every the jumping through one of time stream all can have error; Accumulated time error from GM root clock upstream device farthest also can be maximum; This accumulated error has influenced the time synchronized performance, and jumping figure what have limited, and has limited the size of network environment.
Summary of the invention
The technical issues that need to address of the present invention provide the method and system of many GM equipment time synchronized in a kind of Packet Transport Network; To solve networking restricted problem and the bigger problem of upstream device accumulated time error that single GM time synchronizing method is brought in the large-scale networking; Increase the flexibility of networking, improve the time synchronized performance of equipment.
In order to solve the problems of the technologies described above, the invention provides the method for many GM equipment time synchronized in a kind of Packet Transport Network, comprising:
In networking, dispose a plurality of clock GM;
Each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively.
Further, said preset time synchronized strategy comprises: the clock performance parameter of more said a plurality of GM, select the optimum GM of clock performance parameter;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, comprising:
Said each upstream device is the clock performance parameter of more said a plurality of GM respectively, selects an optimum GM of clock performance parameter to follow the tracks of.
Further, said preset time synchronized strategy further comprises: when the clock performance parameter of said a plurality of GM is consistent, according to the nearest GM of the shortest topological jumping figure chosen distance;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When the clock performance parameter of said a plurality of GM was consistent, said upstream device was followed the tracks of according to a nearest GM of the said upstream device of the shortest topological jumping figure chosen distance respectively.
Further, said preset time synchronized strategy further comprises: when said upstream device is the same apart from the topological jumping figure of two or more GM, then select GM through clock ID or random fashion;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When said upstream device was the same apart from the topological jumping figure of two or more GM, said upstream device selected a GM to follow the tracks of through clock ID or random fashion.
Further, said preset time synchronized strategy further comprises: when the GM that follows the tracks of when certain upstream device breaks down, according to the said upstream device of the shortest topological jumping figure chosen distance recently and the GM that does not break down;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When the GM that follows the tracks of when certain upstream device broke down, said upstream device was no longer followed the tracks of this GM, and according to the said upstream device of the shortest topological jumping figure chosen distance recently and a GM who does not break down follow the tracks of.
Further, said method also comprises:
When the GM that breaks down that follows the tracks of before the said upstream device recovered operate as normal, said upstream device can be followed the tracks of this GM again;
Perhaps; Said upstream device is periodically monitored the said a plurality of GM in the networking; More excellent and/or during when occurring according to the nearer GM of the said upstream device of the shortest topological jumping figure distance than the clock performance parameter of the GM of the current tracking of said upstream device; Then said upstream device is no longer followed the tracks of current GM, selects to follow the tracks of the more excellent and/or nearer GM of the said upstream device of distance of this clock performance parameter.
In order to solve the problems of the technologies described above, the present invention also provides the system of many GM equipment time synchronized in a kind of Packet Transport Network, comprising: root clock GM deployment module and one or more upstream device, wherein:
Said clock GM deployment module is used for disposing a plurality of GM in networking;
Said upstream device is used for selecting a GM to follow the tracks of according to preset time synchronized strategy from said a plurality of GM respectively.
Further, said upstream device comprises:
The strategy presetting module is used for being provided with in advance the time synchronized strategy of selecting to follow the tracks of GM;
Judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, and this GM is notified to tracking module follow the tracks of;
Tracking module is used for after receiving the notice of said judging module, the GM that selects being followed the tracks of.
Further, said time synchronized strategy comprises: the clock performance parameter of more said a plurality of GM, select the optimum GM of clock performance parameter;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, comprising:
The clock performance parameter of the more said a plurality of GM of said judging module is selected an optimum GM of clock performance parameter.
Further, said time synchronized strategy further comprises: when the clock performance parameter of said a plurality of GM is consistent, according to the nearest GM of the shortest topological jumping figure chosen distance;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
The clock performance parameter of the more said a plurality of GM of said judging module, when the clock performance parameter of said a plurality of GM was consistent, said judging module was according to a nearest GM of the said upstream device of the shortest topological jumping figure chosen distance.
Further, said time synchronized strategy further comprises: when said upstream device is the same apart from the topological jumping figure of two or more GM, then select GM through clock ID or random fashion;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
When said upstream device was the same apart from the topological jumping figure of two or more GM, said judging module was selected a GM through clock ID or random fashion.
Further, said time synchronized strategy further comprises: when the GM that follows the tracks of when certain upstream device breaks down, according to the said upstream device of the shortest topological jumping figure chosen distance recently and the GM that does not break down;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
When the GM that follows the tracks of when certain upstream device broke down, said judging module according to the said upstream device of the shortest topological jumping figure chosen distance recently and a GM who does not break down.
Further, said judging module also is used for when the GM that breaks down that follows the tracks of before the said upstream device recovers operate as normal, notifying said tracking module to follow the tracks of this GM again;
Said tracking module also is used for after receiving the notice of said judging module, following the tracks of this GM again;
Perhaps; Said judging module; Also be used for periodically monitoring said a plurality of GM of networking; More excellent and/or during when occurring according to the nearer GM of the said upstream device of the shortest topological jumping figure distance than the clock performance parameter of the GM of the current tracking of said upstream device, then select the more excellent and/or nearer GM of the said upstream device of distance of this clock performance parameter, and this GM notified to tracking module follow the tracks of.
Compared with prior art; The method and system of many GM equipment time synchronized in the Packet Transport Network provided by the invention are introduced many GM time synchronizing method notion, and all upstream devices can be not rigid again all follows the tracks of same GM simultaneously; Solved in the large-scale networking; Networking restricted problem and the bigger problem of upstream device accumulated time error that single GM time synchronizing method is brought have increased the flexibility of networking, have improved the time synchronized performance of equipment.
Description of drawings
Fig. 1 is the system construction drawing of many GM equipment time synchronized in the Packet Transport Network among the embodiment;
Fig. 2 is the method flow diagram of many GM equipment time synchronized in the Packet Transport Network among the embodiment;
Fig. 3 is that single many GM of GM/ time synchronized flow process is set up sketch map in the applying examples;
Fig. 4 is many GM time synchronized flow process fault and the master slave relation topology sketch map when recovering in the applying examples.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
Embodiment:
As shown in Figure 1, present embodiment provides the system of many GM equipment time synchronized in a kind of Packet Transport Network, comprising:
Root clock GM deployment module is used for disposing a plurality of GM in networking;
Upstream device is used for selecting a GM to follow the tracks of according to preset time synchronized strategy from said a plurality of GM respectively.
Wherein, said upstream device comprises:
The strategy presetting module is used for being provided with in advance the time synchronized strategy of selecting to follow the tracks of GM;
Wherein, said time synchronized strategy comprises:
The first, when having a plurality of GM, the clock performance parameter of more said a plurality of GM preferentially selects to follow the tracks of the optimum GM of clock performance parameter;
The clock performance parameter of said GM root clock comprises: priority 1 (Priority1), clock grade (ClockClass), priority 2 (Priority2), clock accuracy (ClockAccurary) and clock stability deviation (OffsetScaledLogVariance) or the like.
The second, when the performance parameter of a plurality of GM is consistent, select the nearest GM of the said upstream device of tracking range according to the shortest topological jumping figure;
The 3rd, when the topological jumping figure of the two or more GM of said upstream device distance is identical, then can select a GM through clock ID or random fashion.
In addition, said time synchronized strategy also comprises:
When the GM that follows the tracks of when certain upstream device broke down, degrading can appear in the clock performance parameter of this GM, no longer follows the tracks of this GM root clock, but can reselect the said upstream device of distance recently and the GM that does not break down according to the shortest topological jumping figure;
In like manner, when the topological jumping figure of the two or more GM of said upstream device distance is identical, then can select a GM through clock ID or random fashion;
Judging module is used for selecting a GM according to above-mentioned time synchronized strategy from a plurality of GM, and this GM is notified to tracking module follow the tracks of;
In addition, said judging module also is used for when the GM that breaks down that follows the tracks of before the said upstream device recovers operate as normal, and the notice tracking module is followed the tracks of this GM again;
Perhaps; Said judging module; Also be used for periodically monitoring said a plurality of GM of networking; More excellent and/or during when occurring according to the nearer GM of the said upstream device of the shortest topological jumping figure distance than the clock performance parameter of the GM of the current tracking of said upstream device, then select the more excellent and/or nearer GM of the said upstream device of distance of this clock performance parameter, and this GM notified to tracking module follow the tracks of.
Tracking module is used for after receiving the notice of said judging module, the GM that selects being followed the tracks of.
As shown in Figure 2, present embodiment provides the method for many GM equipment time synchronized in a kind of Packet Transport Network, may further comprise the steps:
S101: in networking, dispose a plurality of GM;
S102: each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively.
In step S101, these GM are when operate as normal, and clock performance difference is very little, are the 1588v2 root clock of standard, can for upstream device time source be provided simultaneously; When certain GM broke down, degrading can appear in the clock performance parameter of this GM.
In step S102, said preset time synchronized strategy comprises:
The first, when having a plurality of GM root clock, the clock performance parameter that each upstream device can more said a plurality of GM root clocks preferentially selects to follow the tracks of the optimum GM root clock of clock performance parameter;
The clock performance parameter of said GM root clock comprises: priority 1 (Priority1), clock grade (ClockClass), priority 2 (Priority2), clock accuracy (ClockAccurary) and clock stability deviation (OffsetScaledLogVariance) or the like.
The second, when the performance parameter of a plurality of GM root clocks was consistent, each upstream device was selected the nearest GM root clock of the said upstream device of tracking range according to the shortest topological jumping figure;
The 3rd, when the topological jumping figure of the two or more GM root clocks of said upstream device distance is identical, then can select a GM root clock through clock ID or random fashion.
In addition, said preset synchronization policy also comprises:
When the GM root clock of certain upstream device tracking broke down, degrading can appear in the clock performance parameter of this GM root clock, and upstream device is no longer followed the tracks of this GM root clock, but can reselect the GM root clock that tracking is not broken down according to the shortest topological jumping figure;
In like manner, when the topological jumping figure of the two or more GM root clocks of said upstream device distance is identical, then can select a GM root clock through clock ID or random fashion;
When the GM that breaks down recovered operate as normal, said upstream device can be followed the tracks of this GM again; Perhaps, said upstream device is periodically monitored a plurality of GM in the networking, and the clock performance parameter is more excellent and/or during according to the nearer GM of the said upstream device of the shortest topological jumping figure distance when occurring, and said upstream device is then reselected and followed the tracks of this GM.
After GM recovers operate as normal; Parameter in the message that outwards sends can change; Upstream device can perceive GM recovery operate as normal after receiving such message, that is, upstream device monitors possibly exist the more excellent and/or nearer GM of the said upstream device of distance of clock performance parameter in the network.
Like this; In step S102; Each upstream device just can be followed the tracks of for GM of oneself selection from said a plurality of GM according to above-mentioned preset time synchronized strategy respectively; And needn't all follow the tracks of same GM simultaneously, thus make that the deployment of large-scale networking equipment is more flexibly near, also avoided the bigger problem of upstream device accumulated time error simultaneously as much as possible.
In addition, as a kind of preferred mode, can increase a control command on the downstream equipment; This order is used to select single GM and many GM time synchronizing method; Be that upstream device can adopt single GM time synchronizing method, promptly only follow the tracks of same main GM, be not equipped with GM and do not follow the tracks of other; Perhaps, upstream device also can adopt many GM time synchronizing method, i.e. mode in the present embodiment, and each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively.
In an applying examples, comprise two GM, GM1 and GM2 are the main GM clocks in the networking topology and are equipped with the GM clock that two clock performance parameter differences are very little, and all are in normal condition respectively.Set up in the process in single GM time synchronized flow process, what all upstream devices (A1, A2 and A3) were followed the tracks of all is same clock, i.e. GM1, and it has set up principal and subordinate's topological relation, shown in dotted line among Fig. 3, GM1 → A1 → A2, GM1 → A1 → A3; The equipment client/server carries out flowing of time stream according to the dotted line indication in the networking;
And in many GM time synchronizing method that present embodiment provides, upstream device can find that the clock performance parameter of GM1/GM2 is consistent, and then comes the minimum GM of the said upstream device jumping figure of chosen distance to set up principal and subordinate's flow process according to topological jumping figure; The master slave relation topology shown in solid line among Fig. 3, GM1 → A1 → A2, that GM2 → A3, upstream device A3 follow the tracks of is the minimum GM2 of said device A 3 jumping figures of distance; The equipment client/server carries out flowing of time stream according to the solid line indication in the networking.
Master slave relation topology when in Fig. 4, having represented two GM time synchronized flow process faults and recovery:
When GM2 broke down, upstream device A3 followed the tracks of GM1, representes like solid line, new master slave relation topology, GM1 → A1 → A2, GM1 → A1 → A3;
When GM2 recovers just often, upstream device A3 follows the tracks of GM2 again, shown in the principal and subordinate that dotted line is represented, and GM1 → A1 → A2, GM2 → A3;
In the process that the GM2 fault is recovered again, upstream device A1 and A2 follow the tracks of GM1 always, that is, GM1 → A1 → A2 master slave relation never changes.
Certainly also can comprise plural a plurality of GM in the present invention, it is the same that its upstream device is selected the strategy of tracking GM.
Can find out from the foregoing description; With respect to prior art; The method and system of many GM equipment time synchronized in the Packet Transport Network that provides in the foregoing description are introduced many GM time synchronizing method notion, and all upstream devices can be not rigid again all follows the tracks of same GM root clock simultaneously; Solved in the large-scale networking; Networking restricted problem and the bigger problem of node device accumulated time error that single GM time synchronizing method is brought have increased the flexibility of networking, have improved the time synchronized performance of equipment.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is merely the preferred embodiments of the present invention, is not to be used to limit protection scope of the present invention.According to summary of the invention of the present invention; Also other various embodiments can be arranged; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention, and are all within spirit of the present invention and principle; Any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the method for many GM equipment time synchronized in the Packet Transport Network comprises:
In networking, dispose a plurality of clock GM;
Each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively.
2. the method for claim 1 is characterized in that:
Said preset time synchronized strategy comprises: the clock performance parameter of more said a plurality of GM, select the optimum GM of clock performance parameter;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, comprising:
Said each upstream device is the clock performance parameter of more said a plurality of GM respectively, selects an optimum GM of clock performance parameter to follow the tracks of.
3. method as claimed in claim 2 is characterized in that:
Said preset time synchronized strategy further comprises: when the clock performance parameter of said a plurality of GM is consistent, according to the nearest GM of the shortest topological jumping figure chosen distance;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When the clock performance parameter of said a plurality of GM was consistent, said upstream device was followed the tracks of according to a nearest GM of the said upstream device of the shortest topological jumping figure chosen distance respectively.
4. method as claimed in claim 3 is characterized in that:
Said preset time synchronized strategy further comprises: when said upstream device is the same apart from the topological jumping figure of two or more GM, then select GM through clock ID or random fashion;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When said upstream device was the same apart from the topological jumping figure of two or more GM, said upstream device selected a GM to follow the tracks of through clock ID or random fashion.
5. method as claimed in claim 4 is characterized in that:
Said preset time synchronized strategy further comprises: when the GM that follows the tracks of when certain upstream device breaks down, according to the said upstream device of the shortest topological jumping figure chosen distance recently and the GM that does not break down;
Said each upstream device selects a GM to follow the tracks of from said a plurality of GM according to preset time synchronized strategy respectively, also comprises:
When the GM that follows the tracks of when certain upstream device broke down, said upstream device was no longer followed the tracks of this GM, and according to the said upstream device of the shortest topological jumping figure chosen distance recently and a GM who does not break down follow the tracks of.
6. method as claimed in claim 5 is characterized in that:
Said method also comprises:
When the GM that breaks down that follows the tracks of before the said upstream device recovered operate as normal, said upstream device can be followed the tracks of this GM again;
Perhaps; Said upstream device is periodically monitored the said a plurality of GM in the networking; More excellent and/or during when occurring according to the nearer GM of the said upstream device of the shortest topological jumping figure distance than the clock performance parameter of the GM of the current tracking of said upstream device; Then said upstream device is no longer followed the tracks of current GM, selects to follow the tracks of the more excellent and/or nearer GM of the said upstream device of distance of this clock performance parameter.
7. the system of many GM equipment time synchronized in the Packet Transport Network comprises: root clock GM deployment module and one or more upstream device, wherein:
Said clock GM deployment module is used for disposing a plurality of GM in networking;
Said upstream device is used for selecting a GM to follow the tracks of according to preset time synchronized strategy from said a plurality of GM respectively.
8. system as claimed in claim 7 is characterized in that:
Said upstream device comprises:
The strategy presetting module is used for being provided with in advance the time synchronized strategy of selecting to follow the tracks of GM;
Judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, and this GM is notified to tracking module follow the tracks of;
Tracking module is used for after receiving the notice of said judging module, the GM that selects being followed the tracks of.
9. system as claimed in claim 8 is characterized in that:
Said time synchronized strategy comprises: the clock performance parameter of more said a plurality of GM, select the optimum GM of clock performance parameter;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, comprising:
The clock performance parameter of the more said a plurality of GM of said judging module is selected an optimum GM of clock performance parameter.
10. system as claimed in claim 9 is characterized in that:
Said time synchronized strategy further comprises: when the clock performance parameter of said a plurality of GM is consistent, according to the nearest GM of the shortest topological jumping figure chosen distance;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
The clock performance parameter of the more said a plurality of GM of said judging module, when the clock performance parameter of said a plurality of GM was consistent, said judging module was according to a nearest GM of the said upstream device of the shortest topological jumping figure chosen distance.
11. system as claimed in claim 10 is characterized in that:
Said time synchronized strategy further comprises: when said upstream device is the same apart from the topological jumping figure of two or more GM, then select GM through clock ID or random fashion;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
When said upstream device was the same apart from the topological jumping figure of two or more GM, said judging module was selected a GM through clock ID or random fashion.
12. system as claimed in claim 11 is characterized in that:
Said time synchronized strategy further comprises: when the GM that follows the tracks of when certain upstream device breaks down, according to the said upstream device of the shortest topological jumping figure chosen distance recently and the GM that does not break down;
Said judging module is used for selecting a GM according to said time synchronized strategy from a plurality of GM, also comprises:
When the GM that follows the tracks of when certain upstream device broke down, said judging module according to the said upstream device of the shortest topological jumping figure chosen distance recently and a GM who does not break down.
13. system as claimed in claim 12 is characterized in that:
Said judging module also is used for when the GM that breaks down that follows the tracks of before the said upstream device recovers operate as normal, notifying said tracking module to follow the tracks of this GM again;
Said tracking module also is used for after receiving the notice of said judging module, following the tracks of this GM again;
Perhaps; Said judging module; Also be used for periodically monitoring said a plurality of GM of networking; More excellent and/or during when occurring according to the nearer GM of the said upstream device of the shortest topological jumping figure distance than the clock performance parameter of the GM of the current tracking of said upstream device, then select the more excellent and/or nearer GM of the said upstream device of distance of this clock performance parameter, and this GM notified to tracking module follow the tracks of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101943333A CN102739389A (en) | 2012-06-13 | 2012-06-13 | Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101943333A CN102739389A (en) | 2012-06-13 | 2012-06-13 | Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102739389A true CN102739389A (en) | 2012-10-17 |
Family
ID=46994234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101943333A Pending CN102739389A (en) | 2012-06-13 | 2012-06-13 | Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102739389A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683132A (en) * | 2013-11-29 | 2015-06-03 | 中兴通讯股份有限公司 | Method and device for determining backup clock source |
| CN105356990A (en) * | 2015-10-30 | 2016-02-24 | 国网冀北电力有限公司信息通信分公司 | Time synchronization method |
| CN106059696A (en) * | 2015-04-08 | 2016-10-26 | 中兴通讯股份有限公司 | Method and device for configuring synchronization network |
| WO2016184369A1 (en) * | 2015-05-15 | 2016-11-24 | 华为技术有限公司 | Method for configuring clock tracking and control device |
| CN108173616A (en) * | 2018-01-30 | 2018-06-15 | 郑州云海信息技术有限公司 | A kind of method, apparatus and equipment of single-stage monitoring network time synchronization |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1770701A (en) * | 2004-11-03 | 2006-05-10 | 华为技术有限公司 | Clock track realizing method in MESH network |
| CN101159533A (en) * | 2007-11-06 | 2008-04-09 | 中兴通讯股份有限公司 | Clock chain circuit automatic protection method in packet transmission network |
| WO2008125028A1 (en) * | 2007-04-11 | 2008-10-23 | Huawei Technologies Co., Ltd. | A method, an apparatus and a network element for tracing clock |
| CN102130766A (en) * | 2010-01-15 | 2011-07-20 | 华为技术有限公司 | Method, equipment and system for synchronizing Ethernet clock tracking |
| CN102158944A (en) * | 2010-02-11 | 2011-08-17 | 华为技术有限公司 | Sub-frame, network element equipment, and method for synchronizing sub-frame clock |
-
2012
- 2012-06-13 CN CN2012101943333A patent/CN102739389A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1770701A (en) * | 2004-11-03 | 2006-05-10 | 华为技术有限公司 | Clock track realizing method in MESH network |
| WO2008125028A1 (en) * | 2007-04-11 | 2008-10-23 | Huawei Technologies Co., Ltd. | A method, an apparatus and a network element for tracing clock |
| CN101159533A (en) * | 2007-11-06 | 2008-04-09 | 中兴通讯股份有限公司 | Clock chain circuit automatic protection method in packet transmission network |
| CN102130766A (en) * | 2010-01-15 | 2011-07-20 | 华为技术有限公司 | Method, equipment and system for synchronizing Ethernet clock tracking |
| CN102158944A (en) * | 2010-02-11 | 2011-08-17 | 华为技术有限公司 | Sub-frame, network element equipment, and method for synchronizing sub-frame clock |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683132A (en) * | 2013-11-29 | 2015-06-03 | 中兴通讯股份有限公司 | Method and device for determining backup clock source |
| CN106059696A (en) * | 2015-04-08 | 2016-10-26 | 中兴通讯股份有限公司 | Method and device for configuring synchronization network |
| CN106059696B (en) * | 2015-04-08 | 2019-08-06 | 中兴通讯股份有限公司 | A kind of configuration method and device of synchronous net |
| WO2016184369A1 (en) * | 2015-05-15 | 2016-11-24 | 华为技术有限公司 | Method for configuring clock tracking and control device |
| CN106301643A (en) * | 2015-05-15 | 2017-01-04 | 华为技术有限公司 | A kind of method followed the tracks of for configurable clock generator and control equipment |
| CN106301643B (en) * | 2015-05-15 | 2018-10-30 | 华为技术有限公司 | A kind of method and control device for configurable clock generator tracking |
| CN105356990A (en) * | 2015-10-30 | 2016-02-24 | 国网冀北电力有限公司信息通信分公司 | Time synchronization method |
| CN105356990B (en) * | 2015-10-30 | 2019-03-08 | 国网冀北电力有限公司信息通信分公司 | Method for synchronizing time |
| CN108173616A (en) * | 2018-01-30 | 2018-06-15 | 郑州云海信息技术有限公司 | A kind of method, apparatus and equipment of single-stage monitoring network time synchronization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102263630B (en) | A kind of system of selection of clock source | |
| EP2514125B1 (en) | Configuration of synchronisation network having synchronization trails for time sync and frequency sync | |
| EP2802097B1 (en) | Clock synchronization method and device | |
| JP6125652B2 (en) | Time synchronization method and apparatus | |
| EP2502372B1 (en) | Configuration of synchronisation network | |
| CN103916950B (en) | Method for synchronizing time and system | |
| EP2144400A1 (en) | Distributed ethernet system and method for detecting fault based thereon | |
| CN102739389A (en) | Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network | |
| CN102843205B (en) | The method and apparatus that a kind of time synchronized based on Precision Time Protocol restrains | |
| EP2911341B1 (en) | Method and device for dynamically switching gateway of distributed resilient network interconnect | |
| US8203969B2 (en) | Network timing topology via network manager | |
| EP2712099A1 (en) | Method for managing and maintaining an accurate distribution of time in a network when a failure occurs | |
| EP3121996B1 (en) | Synchronization failure processing method and system for clock and time synchronization network | |
| CN101286835A (en) | Clock tracing method, device and network element device | |
| JP2013545335A (en) | Method and apparatus for protocol event management | |
| CN102404216A (en) | Method for TRILL (transparent interconnection of lots of links) network protection, routing bridge and system | |
| CN103490840B (en) | A kind of apparatus and method for carrying out Precision Time Protocol Message processing | |
| CN104468537A (en) | System and method for achieving safety audit | |
| EP2800287A1 (en) | Method and device for detecting symmetry of optical fiber | |
| JP2010004321A (en) | Time tracking system and time tracking apparatus | |
| CN104160667A (en) | Method, Device, and System for Dual-Uplink Tangent Ring Convergence | |
| CN102412984A (en) | Management method and equipment for forwarded table entry | |
| WO2016206409A1 (en) | Local route restoration method and device | |
| CN111510238B (en) | Method and system for centralized monitoring synchronization state of airborne clock | |
| JP5697071B2 (en) | Network system and failure recovery method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121017 |