CN102123057B - Synchronous network route detection, optimization and network routing method and synchronous network system - Google Patents
Synchronous network route detection, optimization and network routing method and synchronous network system Download PDFInfo
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Abstract
The invention discloses a synchronous network route detection, optimization and network routing method and a synchronous network system. The optimization method comprises the following steps of: obtaining a node to be optimized, and adding the node to be optimized to a first queue; detecting an adjacent node of the node to be optimized, and judging whether the adjacent node can be introduced into a protection link; if the adjacent node can be introduced into the protection link, adding the adjacent node to a second queue; traversing the adjacent nodes in the second queue, sequentially introducing the node to be optimized into a backup link for performing exploratory detection until the main/backup routing requirements are met, and deleting the node to be optimized in the first queue; and repeating the steps until the first queue is null.
Description
Technical field
The present invention relates to synchronizing network, relate in particular to detection and optimization method for the standby usage route in synchronizing network.
Background technology
Synchronization Network refers to such network, and clocks all in this network have identical long-term accuracy under normal running (operation) conditions.Synchronization Network is the network for timing reference signal is provided, and generally speaking, the Synchronization Network node that Synchronization Network is connected by synchronization link forms.Concrete, synchronous method mainly contains master-slave synchronisation method and mutual synchronized method.The present invention has mainly used master-slave synchronisation method, and all clocks are all followed the tracks of in a certain reference clock, obtains synchronously by timing base is passed to next clock from a clock.
Synchronizing network in the present invention is made up of service node, clock node, internodal work (primary) link and internodal protection (for subsequent use) link.Clock node is wherein divided into again one-level clock node, secondary clock node and stratum-3 clock node.One-level clock node is arranged on inter-provincial and transport layer intersection inside the province, and secondary clock node is arranged on inside the province and local transport layer intersection, and stratum-3 clock Node configuration is located in local network end office (EO).
About other basic fundamental contents of synchronizing network, those skilled in the art also can be with reference to " planing method of digital synchronous network and organizational principle ", The Ministry of Information Industry of the People's Republic of China, MOII, issue on July 13rd, 1999, " communication network in-service surveillance management method ", the Ministry of Industry and Information Technology of the People's Republic of China (PRC), on April 24th, 2009 is issued and " electric power digital Synchronization Network engineering design specification ", the National Development and Reform Commission of the People's Republic of China (PRC), on July 20th, 2007 is issued.The full content of above-mentioned these publications is all included in here as a reference by reference.
Synchronizing network requires strict synchronous from principle, in net, the clock frequency of each node is all limited in predetermined range of tolerable variance, to avoid inaccurate deteriorated, the error code that causes transmission performance.But in actual Synchronization Network, the reasons such as Cable's Fault, equipment fault, network change all likely change network timing performance at any time, thereby its route also may change at any time.
In synchronizing network planning of the present invention, active link has formed primary route, and reserve link and part active link have formed alternate routing.The present invention only chooses its corresponding reserve link as an alternative in the part breaking down, but other part not breaking down still adopts original active link.Generally speaking, a primary route and one or more alternate routing can be set in the time of the network planning, to ensure that network still can successfully move in the time that network breaks down, thereby improve the safety and stability of whole network.But irrational synchronizing network planning cannot ensure synchronizing network trouble-free operation all the time in prior art.
Concrete, the irrationality of the network planning is mainly reflected in three aspects: in the network planning primary route do not exist, in the network planning alternate routing do not exist and the network planning in standby usage route physically do not isolate node.Here, standby usage route is not physically isolated node and is referred to the not isolation completely of standby usage route, has finally all pointed to the situation of same clock node.That is to say, standby usage route has finally all been pointed to same clock source.In Synchronization Network, can there are a variety of clock sources, such as PRC (the whole network reference clock) clock, LPR (local primary reference), DNU (can not be used as synchronous) clock etc.Once standby usage route has finally all been pointed to PRC clock, think that it becomes standby usage route and does not physically isolate node.
When any in the irrationality situation that above-mentioned three kinds of network plannings occur, just need to be optimized standby usage route, to ensure the trouble-free operation of this network.
At present, the key step of synchronizing network standby usage routing optimization method is comprised:
1. set up whole synchronizing network, comprise service node, clock node and connect active link and the reserve link of each node, formed primary route by active link, reserve link has formed alternate routing.
2. the synchronizing network having established is not detected, do not go to determine between whether any two nodes of synchronizing network all there is active link or reserve link, do not go to determine whether that standby usage route physically do not isolate node.
If 3. primary route breaks down, alternate routing is activated into current primary route, and sets up new alternate routing.
If 4. current primary route breaks down again, new alternate routing is activated into current primary route, and sets up another new alternate routing.
5. by that analogy, complete the optimization to whole synchronizing network standby usage route.
Correspondingly, the networking solution security of above-mentioned prior art is lower, this is all to have active link or reserve link because this networking scheme does not go to determine between whether any two nodes of synchronizing network, does not go to determine whether that standby usage route physically do not isolate node.With regard to meaning that important prerequisite that this network plan is implemented is smoothly to want strict setting up according to a main standby pattern when the networking, indispensable like this.Obvious; alternate routing is made up of protection link; there is no reserve link if only have active link between certain two node in synchronizing network; so in the time that the active link between these two nodes breaks down; cannot find available alternate routing to replace, finally can only cause the paralysis of whole network.
Secondly, above-mentioned networking scheme function imperfection, finally all be connected to the situation of same clock node for the primary route of same destination node and alternate routing, while there is the irrationality situation of above mentioned the third network planning, prior art is with regard to the such irrationality situation of None-identified, like this, synchronizing network still cannot move, and does not complete the object of optimization.
In addition, above-mentioned networking scheme resource utilization is low.In above-mentioned networking scheme, in the time that primary route breaks down, choose alternate routing as an alternative, this alternate routing is made up of all protection links.In the time that network breaks down, can abandon whole primary route, select new alternate routing.So directly cause the waste of resource, can not effectively utilize existing Internet resources.
Therefore,, in the urgent need to providing a kind of standby usage route to detect and optimization method, so that when any in the irrationality that occurs above mentioned three kinds of network plannings, can automatically and effectively carry out standby usage routing optimality to synchronizing network.
Summary of the invention
Technical problem to be solved by this invention is, a kind of detection and optimization method for the standby usage route in synchronizing network is provided, thus can effectively detect and optimized synchronization network in the primary route that occurs do not exist, alternate routing does not exist and standby usage route is not physically isolated three kinds of unreasonable network plannings such as node.
According to a first aspect of the invention, a kind of detection method of the standby usage route of implementing in synchronizing network is provided, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described detection method comprises the following steps: steps A. search whole nodes; Step B. selects one of them node successively; Whether the node that step C. detects this selection meets that primary route does not exist, alternate routing does not exist and any one in not isolating of standby usage route, in the time not meeting in above-mentioned condition any one, returns to step B; And step D. is in the time meeting in above-mentioned condition any one, determines that this node breaks down, and records the node that this breaks down, and then returns to the processing of step B repeating step C and step D until last node finding.
The step C of this detection method further comprises: step C-1. detects selected clock node and whether meets primary route and do not exist, and in the time not meeting this condition, advances to step C-2; Step C-2. detects selected clock node and whether meets alternate routing and do not exist, and in the time not meeting this condition, advances to step C-3; And step C-3. detects selected clock node and whether meet standby usage route and do not isolate, in the time not meeting this condition, determine that this clock node does not break down, and return to step B.
In the step C-1 of this detection method, search the primary route of this node by recurrence method.
In the step C-2 of this detection method, the alternate routing of searching this node by improved degree of depth traversal.
In the step C-3 of this detection method, if standby usage route has finally all been pointed to the whole network reference clock, judge the physically not isolation of standby usage route.
According to a second aspect of the invention, a kind of optimization method of the standby usage route of implementing in synchronizing network is provided, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described optimization method comprises the following steps: step e. obtains node to be optimized, and described clock node to be optimized added to the first queue; Step F. can the neighbor node the judgement that detect described node to be optimized introduce protection link, in the time can introducing protection link, described neighbor node are added to the second queue; Step G. travels through the neighbor node in described the second queue, and this clock node to be optimized is introduced to protection link successively and carry out exploratory detection, until meet active and standby route request, and delete this clock node to be optimized from described the first queue; And step H. returns, and step G processes until described first team classifies sky as.
Between the step F of this optimization method and step G, further comprise: step I. sorts to the each node in described the first queue according to the adjacent node number of each node in the second queue in described the first queue; With sequence node formerly in the first queue described in step J. priority treatment.
Described node to be optimized comprise have that primary route does not exist, alternate routing does not exist and standby usage route do not isolate in the node of any fault.
Can the judgement in the step F of this optimization method be introduced protection link and further comprise: judge whether neighbor node meets active and standby route request.
In the time judging that neighbor node does not meet active and standby route request, further carry out: step F-1. judge that whether the master clock of neighbor node and described node to be optimized is identical, wherein, when the judged result in step F-1 is true time, ignore this neighbor node and detect the next neighbor node in the second queue; When the judged result in step F-1 is fictitious time, this neighbor node is added to the second queue.
Exploratory detection in the step G of this optimization method comprises whether judgement can cause physically not isolation between new primary route and alternate routing in the time introducing protection link from neighbor node to node to be optimized.
According to a third aspect of the invention we, a kind of network route method of implementing in synchronizing network is provided, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described network route method comprises: first carry out each step of above-mentioned detection method, carry out subsequently each step of above-mentioned optimization method.
According to a forth aspect of the invention, provide a kind of synchronous network system, described synchronizing network comprises service node, clock node, active link and reserve link, utilizes above-mentioned network route method to be optimized operation for the route of synchronous network system.Wherein, described synchronizing network can be electric power digital synchronizing network or telecommunication system synchronizing network.
With respect to the state of the art, tool of the present invention has the following advantages:
The first, complete comprehensive.Compared with prior art, the present invention has solved the multiple standby usage route planning mistake that may occur in synchronizing network more all sidedly.Can complete to primary route do not exist, alternate routing does not exist and standby usage route is not physically isolated the optimization of node.Prioritization scheme can be optimized (correction) to most route planning mistake flexibly, has utilized fully Internet resources.
The second, stability and safety.Due to the present invention on prior art basis, completed in addition to primary route do not exist, alternate routing does not exist and standby usage route is not physically isolated the optimization of node, has greatly improved stability and the fail safe of synchronizing network.Meanwhile, utilize the optimum results of making, the present invention also can automatically detect to guarantee the correctness of network route optimization again.
The 3rd, the utilization of resources is high.In synchronizing network planning of the present invention, active link has formed primary route, and reserve link and part active link have formed alternate routing.The present invention only chooses its corresponding reserve link as an alternative in the part breaking down, but other part not breaking down still adopts original active link.Like this, improved the resource utilization of network by the present invention.
In the time of embodiment below accompanying drawing in conjunction with appended is read, can to other objects of the present invention and further feature obtain clearly and understand.
Brief description of the drawings
Fig. 1 is the network configuration schematic diagram schematically showing generally about synchronizing network;
Fig. 2 shows according to the flow chart of the detection method of the standby usage route of the embodiment of the present invention;
Fig. 3 shows according to the flow chart of the optimization method of the standby usage route of the embodiment of the present invention; And
Fig. 4 to Fig. 6 is the schematic diagram that schematically shows respectively several situations of heuristic optimization.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
the network configuration of synchronizing network
Fig. 1 schematically shows the network configuration schematic diagram about synchronizing network 100 generally.As will be understood by the skilled person in the art, synchronizing network can be widely used in the various occasions that need clock synchronous, such as wired or wireless network service, electric power system, packet network etc.
As shown in Figure 1, synchronizing network 100 comprises one-level clock node 10, secondary clock node 20 and stratum-3 clock node 30.Wherein the number of one-level, secondary and stratum-3 clock node is not limited to the number shown in Fig. 1.In Fig. 1, solid line represents primary timing base, and dotted line represents timing base for subsequent use.
Here, synchronizing network 100 can be cable network, can be also wireless network, and the present invention is not limited thereto.
Common, one-level clock node 10 is arranged on inter-provincial and transport layer intersection inside the province, and secondary clock node 20 is arranged on inside the province and local transport layer intersection, and stratum-3 clock node 30 is arranged on place of local network end office (EO).
By various links, the clock nodes at different levels in synchronizing network 100 are interlinked, and various link form respectively primary route and alternate routing.
Below, will explain by reference to the accompanying drawings according to the standby usage route for synchronizing network 100 of the present invention and detect and optimization method.
the detection method of standby usage route
Fig. 2 shows according to the flow chart of the detection method of the standby usage route of the embodiment of the present invention.
With reference to figure 2, explain the idiographic flow of this detection method.
In step S201, search all clock nodes in service node and the synchronizing network 100 of synchronizing network 100, to determine successively whether these nodes meet standby usage route request, are correspondingly optimized in the optimization method that whether needs to illustrate in the back.Here, if certain node meets standby usage route request, refer to that this node possesses primary route, possess alternate routing, and be the node of physically isolating between standby usage route, standby usage route has been pointed to respectively different clock types.
Here, in synchronizing network, have a variety of clock sources, such as PRC (the whole network reference clock), LPR (local primary reference), DNU (can not be used as synchronous) etc.For example, finally all point to PRC clock as long as standby usage route, illustrated and in standby usage route, physically do not isolate node.
In optional embodiment, in step S201, can search all secondarys and stratum-3 clock node, but the present invention is not limited thereto.
Next,, in step S202, first search the primary route of this node.If primary route does not exist ("No" in step S203), determine that this node does not meet standby usage route and detects (step S207).
On the other hand, if primary route exists ("Yes" in step S203), handling process advances to step S204.
Here in step S202, preferably adopt recurrence method to search the primary route of this node.
Next,, in step S204, search the alternate routing of this node.If alternate routing does not exist ("No" in step S205), determine that this node does not meet standby usage route and detects (step S207).
On the other hand, if alternate routing exists ("Yes" in step S205), handling process advances to step S206.
Here in step S204, preferably adopt improved degree of depth traversal to search the alternate routing of this node.
Next,, in step S206, when the primary route of this node and alternate routing all exist, judge between primary route and alternate routing and whether physically isolate completely, primary route and alternate routing are not occured simultaneously.
If physically not isolation (in step S206 no) completely between primary route and alternate routing, determines that this node does not meet standby usage route and detects (step S207).
If physically isolation (being in step S206) completely between primary route and alternate routing, determines that this node does not need to carry out follow-up standby usage routing optimality, and finishes the Check processing for this node.
Here, be worth special instruction, the detection method shown in Fig. 2 is only a kind of preferred embodiment, and wherein the sequencing of step S203, S205 and S206 can correspondingly arrange as required.For example, in optional embodiment, can first search alternate routing and search again primary route, finally judge the whether physically isolation of standby usage route.
Visible, in the present invention, the prerequisite that has proposed to be optimized for synchronizing network is this synchronizing network to be carried out to standby usage route as above detect.Only detect the fault (mistake) of synchronizing network aspect route, just need to carry out further network route optimization processing.
Therefore, by route detecting method as above, can effectively detect that the primary route that may occur does not exist, alternate routing does not exist and the physically failure situations such as isolation completely not of standby usage route in synchronizing network, and be the follow-up ready work of routing optimality.
Next, will be with reference to figure 3, explain the optimization method of the standby usage route in synchronizing network 100.
the optimization method of standby usage route
Complete as above to the detection of standby usage route after, found the unreasonable part of standby usage route in synchronizing network, next will carry out optimization processes to ensure the trouble-free operation of synchronizing network to these nodes to be optimized.
Fig. 3 shows according to the flow chart of the optimization method of the standby usage route of the embodiment of the present invention.
With reference to figure 3, explain the idiographic flow of this optimization method.
In step S301, from the testing result of detection method as above, obtain not meeting the node of standby usage route request, and the node that detection is obtained adds in queue to be optimized.
Here, queue refers to the data structure of a kind of first-in first-out (FIFO) mode memory node, but the present invention is not as limit, also can suitably select as required other suitable data structures.As long as these data structures can meet temporary node to be optimized, within all should comprising protection scope of the present invention.
Next,, in step S302, first traversal is arranged in the neighbor node of the first node of queue to be optimized.
Next,, in step S303, judge whether the neighbor node that traversal obtains meets standby usage route request.In the time meeting standby usage route request ("Yes" in step S303), in step S304, this neighbor node is added to available queue.
Preferably, in the time not meeting standby usage route request ("No" in step S303), also further judge the master clock whether identical (step S303a) of neighbor node and this node to be optimized.
Wherein, in the time that the master clock of the neighbor node node to be optimized with this is different ("No" in step S303a), advance to step S304.Otherwise, return to step S302.
Here, preferably, can sort (step S304a) to each node to be optimized according to the number of the adjacent node of the protection the introduced link of each node, and priority treatment can be with selecting maximum nodes (step S304b).
Next,, in step S305, judge whether queue to be optimized is empty, whether also has not optimised node.
If queue to be optimized is empty, advance to step S309 end process.If queue to be optimized is not empty, advance to step S306.
Next,, in step S306, the neighbor node in traversal available queue, introduces successively reserve link and carries out exploratory detection.Will explain subsequently exploratory detection.
Next,, in step S307, whether judgement (exploratory detection obtains) new standby usage route meets standby usage route request.
On the one hand, in the time that new standby usage route meets the requirements ("Yes" in step S307), in step S308, from queue to be optimized, delete and met the node of standby usage route request, and return to step S305, to next one node to be optimized is carried out and processed.
On the other hand, in the time that new standby usage route is undesirable ("No" in step S307), return to step S306, and continue to carry out exploratory detection.
method of heuristic optimisation
Consider that introducing protection link from the adjacent node of node to be optimized to this node carries out heuristic optimization.Here, whether heuristic optimization refers to, if introduce protection link from neighbor node to this node, can cause physically becoming and not isolating node between new primary route and alternate routing.That is to say, the clock type that the clock that neighbor node points to and this node point to is likely identical, so physically just becomes and does not isolate node, also just cannot introduce from neighbor node to this node protection link.
Fig. 4 to Fig. 6 shows respectively the schematic diagram of several situations of heuristic optimization.Wherein, in Fig. 6, for the ease of showing, internodal active link is not shown, only shows reserve link.In addition, in Fig. 4 to Fig. 6, what solid line represented is active link, is reserve link and dotted line represents.
As shown in Figure 4, be mistake (fault) situation that node has occurred physically not isolate, because when after one-level clock node PRC fault, alternate routing is still pointed to PRC.Here,, although used two PRC nodes in Fig. 4, they all refer to same clockwork.
And then, as shown in Figure 5, be the situation of physically isolating node.If PRC clock failure, can introduce LPR clock by alternate routing.
So-called heuristic optimization is exactly in the time optimizing " node to be optimized ", from neighbor node to reserve link of the tentative introducing of node to be optimized.If neighbor node meets standby usage route request, namely pointing between the standby usage route of neighbor node is physically to isolate node, as shown in Figure 6.In the time that one-level clock breaks down, can in two different clocks, select by neighbor node the clock that priority is high (being secondary clock LPR) here and pass to node to be optimized.If situation as shown in Figure 5, this neighbor node just meets standby usage route request and is added available queue so.
In heuristic optimization, if neighbor node does not meet standby usage route request, so and then judge that whether the clock of neighbor node is identical with the clock of node to be optimized, if identical, so just be equivalent to occur the situation shown in Fig. 4, this neighbor node is unavailable so; If not identical, be equivalent to so occur the situation shown in Fig. 5, now neighbor node can be joined to available queue.
network route method
Can suitably combine detection method and the optimization method of standby usage route as above according to the network route method of synchronizing network of the present invention, thereby automatically and effectively carry out the routing optimality to synchronizing network, in the time there is routing failure, can effectively obtain new routing optimality by upgrading standby usage route.
synchronous network system
In embodiments of the present invention, above-mentioned network route method can be widely used in the middle of the routing optimality operation for various synchronous network systems.These synchronizing networks generally include service node, clock node, active link and reserve link.
Here, synchronizing network is for example electric power digital synchronizing network or telecommunication system synchronizing network.But the present invention is not as limit.
Finally should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (13)
1. a detection method for the standby usage route of implementing in synchronizing network, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described detection method comprises the following steps:
Steps A. search whole service nodes and clock node;
Step B. selects one of them node successively;
Whether the node that step C. detects this selection meets that primary route does not exist, alternate routing does not exist and physically any one in isolation of standby usage route, in the time not meeting in above-mentioned condition any one, returns to step B; And
Step D. in the time meeting in above-mentioned condition any one, determines that this node breaks down, and records the node that this breaks down, then returns to the processing of step B repeating step C and step D until last node finding;
Standby usage route physically isolation refer to that standby usage route finally all points to same clock source.
2. detection method according to claim 1, is characterized in that, described step C further comprises:
Step C-1. detects selected node and whether meets primary route and do not exist, and in the time not meeting this condition, advances to step C-2;
Step C-2. detects selected node and whether meets alternate routing and do not exist, and in the time not meeting this condition, advances to step C-3; And
Step C-3. detects selected node and whether meets the physically not isolation of standby usage route, in the time not meeting this condition, determines that this node does not break down, and returns to step B.
3. detection method according to claim 2, is characterized in that, in described step C-1, searches the primary route of this node by recurrence method.
4. detection method according to claim 2, is characterized in that, in described step C-2, and the alternate routing of searching this node by improved degree of depth traversal.
5. detection method according to claim 2, is characterized in that, in described step C-3, if standby usage route has finally all been pointed to the whole network reference clock, judges the physically not isolation of standby usage route.
6. an optimization method for the standby usage route of implementing in synchronizing network, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described optimization method comprises the following steps:
Step e. obtain node to be optimized, and described node to be optimized is added to the first queue;
Step F. can the neighbor node the judgement that detect described node to be optimized introduce reserve link, in the time can introducing reserve link, described neighbor node are added to the second queue;
Step G. travels through the neighbor node in described the second queue, and this node to be optimized is introduced to reserve link successively and carry out exploratory detection, until meet active and standby route request, and delete this node to be optimized from described the first queue; And
Step H. returns to that step G processes until described first team classifies sky as;
Described node to be optimized comprises and has that primary route does not exist, alternate routing does not exist and the physically node of any fault in isolation of standby usage route;
Standby usage route physically isolation refer to that standby usage route finally all points to same clock source;
Meet active and standby route request, refer to and possess primary route, possess alternate routing, and standby usage route is pointed to respectively different clock types.
7. optimization method according to claim 6, is characterized in that, between step F and step G, further comprises:
Step I. sorts to the each clock node in described the first queue according to the adjacent node number of each node in the second queue in described the first queue; With
Sequence node formerly in the first queue described in step J. priority treatment.
8. according to the optimization method described in claim 6 or 7, it is characterized in that, can the judgement in described step F be introduced reserve link and further comprise: judge whether neighbor node meets active and standby route request.
9. optimization method according to claim 8, is characterized in that, in the time judging that neighbor node does not meet active and standby route request, further carries out:
Step F-1. judge that whether the master clock of neighbor node and described node to be optimized is identical,
Wherein, when the judged result in step F-1 is true time, ignore this neighbor node and detect the next neighbor node in the second queue; When the judged result in step F-1 is fictitious time, this neighbor node is added to the second queue.
10. optimization method according to claim 6, it is characterized in that, the exploratory detection in described step G comprises that judgement is when whether can cause physically not isolation between new primary route and alternate routing in the time that node to be optimized is introduced reserve link from neighbor node.
11. 1 kinds of network route methods of implementing in synchronizing network, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, described network route method comprises:
Carry out each step of detection method according to claim 1; With
Carry out each step of optimization method according to claim 6.
12. 1 kinds of synchronous network systems, described synchronizing network comprises service node, clock node, active link and reserve link, it is characterized in that, network route method according to claim 11 is optimized operation for the route of described synchronous network system.
13. synchronous network systems according to claim 12, is characterized in that, described synchronizing network is electric power digital synchronizing network or telecommunication system synchronizing network.
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| CN107465475A (en) * | 2016-06-06 | 2017-12-12 | 中兴通讯股份有限公司 | A kind of network equipment clock/time detecting method and apparatus |
| CN105871496B (en) * | 2016-06-14 | 2017-12-08 | 河海大学 | A kind of synchronous optical network clock chain circuit planing method |
| CN109936508A (en) * | 2017-12-19 | 2019-06-25 | 中国移动通信集团公司 | A kind of processing method and processing device of network congestion |
| CN109347712B (en) * | 2018-10-10 | 2024-06-18 | 重庆中车四方所智能装备技术有限公司 | Network system based on rail transit |
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| CN1719825A (en) * | 2004-07-06 | 2006-01-11 | 华为技术有限公司 | Method and network for implementing link protection change |
| CN101841408A (en) * | 2010-05-07 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Primary/standby route equipment switching method and route equipment |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507227A (en) * | 2002-12-12 | 2004-06-23 | 华为技术有限公司 | Method of preventing formation of timing loop in synchronous network |
| CN1719825A (en) * | 2004-07-06 | 2006-01-11 | 华为技术有限公司 | Method and network for implementing link protection change |
| CN101841408A (en) * | 2010-05-07 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Primary/standby route equipment switching method and route equipment |
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