CN103001789A - Clock switching method and clock switching device - Google Patents
Clock switching method and clock switching device Download PDFInfo
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- CN103001789A CN103001789A CN2011102776193A CN201110277619A CN103001789A CN 103001789 A CN103001789 A CN 103001789A CN 2011102776193 A CN2011102776193 A CN 2011102776193A CN 201110277619 A CN201110277619 A CN 201110277619A CN 103001789 A CN103001789 A CN 103001789A
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- service board
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- 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
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
- H04J3/0688—Change of the master or reference, e.g. take-over or failure of the master
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Abstract
The invention provides a clock switching method and a clock switching device. The method includes: detecting whether a main system clock received by a service single board interrupts or not; if the main system clock received by the service single board interrupts, switching the main system clock to a backup system clock; and transmitting the backup system clock to the service single board. The clock switching method and the clock switching device have the advantages that the problem of incapability of achieving switching of a main system clock and a backup system clock when clock signals interrupt in the prior art is solved, so that service interruption or running abnormality of the single board caused by abnormalities of the main system clock and the backup system clock is avoided, and running reliability of equipment is improved.
Description
Technical field
The present invention relates to communication field, in particular to a kind of clock switch method and device.
Background technology
At present; communication field is in order to improve the reliable performance of communication apparatus; mostly adopt the main-apparatus protection mode; namely; when host apparatus occur when unusual system can auto switching to stand-by equipment; realize the function of masterslave switchover, thereby reduced the service damage that breaks down and cause owing to host apparatus, improved the reliability of communication apparatus.
For the communication apparatus with main-apparatus protection function; rearranging main/slave clock is again one of its important function; as shown in Figure 1; host apparatus and stand-by equipment provide clock to use the main system clock that service board 100 provides by the current host apparatus that is in master state of clock selecting unit 104 choice for uses to service board 100 by system clock unit 102 simultaneously.In this way, being provided for service boards all on the communication apparatus after main system clock and standby system clock produce uses.When the host apparatus that is in master state broke down, system can be switched on the stand-by equipment, and this moment, stand-by equipment was in master state, and the clock of simultaneously service board use also can be switched on the stand-by equipment that is in master state, thereby realized masterslave switchover.
Yet, when the host apparatus that is in master state is under the normal operating conditions, may be owing to interrupting appears in clock signal former such as plug veneer etc. thereby that cause receiving on the service board, that is to say that the main system clock that is provided by the host apparatus that is in master state can't be provided service board.But, present agreement is not stipulated the performed operation of service board under this scene, for example, service board can't be received the clock switch order under this scene, thereby can't carry out the clock switch operation, in this case, service board just might be subject to the impact that clock interrupts, and causes the generation of the situations such as service disconnection or veneer operation exception.
Summary of the invention
Problem for can't realize the main preparation system clock switch in the prior art in the situation that the clock signal interruption occurs the invention provides a kind of clock switch method and device, to address the above problem at least.
According to an aspect of the present invention, provide a kind of clock switch method, it comprises: whether the main system clock that the detection service board receives occurs interrupting; If interrupting appears in the main system clock that service board receives, then main system clock is switched to standby system clock; To be transferred to service board for system clock.
Preferably, the step whether main system clock that receives on the detection service board occurs interrupting comprises: do not receive main system clock in case detect service board, judge that then interrupting appears in the main system clock that service board receives.
Preferably, the step whether main system clock that receives on the detection service board occurs interrupting comprises: do not receive main system clock if detect service board at predetermined time Duan Shangjun, judge that then interrupting appears in the main system clock that service board receives.
The step whether main system clock that preferably, receives on the detection service board occurs interrupting comprises: do not receive main system clock if detect service board, then the opening timing device; Whether judgement all detects service board and does not receive main system clock in the timing cycle of timer; Receive main system clock if in the timing cycle of timer, detect service board, judge that then interrupting does not appear in the main system clock that service board receives.
Preferably, provide the entity of main system clock working properly.
Preferably, detecting the step whether main system clock that service board receives occur interrupting comprises: whether the high frequency clock that frequency of utilization is higher than main system clock detects the main system clock that service board receives and occurs interrupting.
According to a further aspect in the invention, provide a kind of clock switch device, it comprises: the clock detection unit, and whether the main system clock that receives for detection of service board occurs interrupting; Control unit when interrupting appears in the main system clock that is used for receiving at service board, is switched to standby system clock with main system clock, and will be transferred to service board for system clock.
Preferably, the clock detection unit comprises: first detection module is used in case when detecting service board and not receiving main system clock, judge that interrupting appears in the main system clock that service board receives.
Preferably, the clock detection unit comprises: the second detection module is used for judging that interrupting appears in the main system clock that service board receives when predetermined time Duan Shangjun detects service board and do not receive main system clock.
Preferably, the clock switch device also comprises: be in the system clock unit under the normal operating conditions, be used for providing main system clock and standby system clock.
Preferably, the clock detection unit comprises: high frequency clock circuit is higher than the clock of main system clock for generation of frequency; Whether testing circuit is used for detecting the main system clock that service board receives with the clock that high frequency clock circuit produces and occurs interrupting.
Realized switching of main preparation system clock when interrupting appears in the main system clock that the present invention receives at service board, solved the problem that in the situation that the clock signal interruption occurs, can't realize the main preparation system clock switch in the prior art, thereby avoided because service disconnection or the veneer operation exception that the main preparation system clock causes unusually improves the equipment reliability of operation.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of clock switch of the prior art system;
Fig. 2 is a kind of preferred structured flowchart according to the clock switch device of the embodiment of the invention;
Fig. 3 is the another kind of preferred structured flowchart according to the clock switch device of the embodiment of the invention;
Fig. 4 is a kind of preferred structured flowchart according to the clock detection unit of the embodiment of the invention;
Fig. 5 is a kind of preferred flow chart according to the clock switch method of the embodiment of the invention;
Fig. 6 is the another kind of preferred flow chart according to the clock switch method of the embodiment of the invention;
Fig. 7 is another the preferred flow chart according to the clock switch method of the embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment 1
Fig. 2 is a kind of preferred structured flowchart according to the clock switch device of the embodiment of the invention, and as shown in Figure 2, this clock switch device comprises: clock detection unit 202, and whether the main system clock that receives for detection of service board occurs interrupting; Control unit 204 is connected with clock detection unit 202, when interrupting appears in the main system clock that is used for receiving at service board, main system clock is switched to standby system clock, and will be transferred to service board for system clock.
In above-mentioned preferred embodiment, when the main system clock appearance interruption that service board receives, realized switching of main preparation system clock, solved the problem that in the situation that the clock signal interruption occurs, can't realize the main preparation system clock switch in the prior art, thereby avoided because service disconnection or the veneer operation exception that the main preparation system clock causes unusually improves the equipment reliability of operation.
Whether occur interrupting in order to detect the main system clock that service board receives, the invention provides a kind of preferred clock detection unit 202, whether the high frequency clock that these preferred clock detection unit 202 frequencies of utilization are higher than main system clock detects the main system clock that service board receives and occurs interrupting.As shown in Figure 4, to achieve these goals, clock detection unit 202 can comprise: high frequency clock circuit 402 is higher than the clock of described main system clock for generation of frequency; Testing circuit 404 is used for detecting the main system clock that service board receives with the clock that described high frequency clock circuit produces and interruption whether occurs.
Owing to used frequency to be higher than the high frequency clock of main system clock, therefore, can judge in each clock cycle of main system clock whether the main system clock that service board receives occurs interrupting exactly by high frequency clock, thus the accuracy that has guaranteed to interrupt detection.Further, owing to used frequency to be higher than the high frequency clock of main system clock, the detection frequency can be set according to the actual requirements, for example, high frequency clock is the twice of the frequency of main system clock, supposes that each of main system clock is used high frequency clock sampling twice clock cycle, thereby when the value that samples when the clock cycle of continuous two high frequency clocks is respectively 0 and 1 (perhaps 1 and 0), it is normal to judge that main system clock receives, otherwise judges that interrupting appears in the main system clock reception.Suppose that each of main system clock uses high frequency clock sampling four times clock cycle, when thereby the value that samples when the clock cycle of continuous four high frequency clocks is respectively 0011 (perhaps being 1100,1001,0110), it is normal to judge that main system clock receives, otherwise judges that interrupting appears in the main system clock reception.As seen, the high frequency clock that is higher than main system clock by frequency of utilization detects can be so that the present invention be applicable to different scenes.
On the basis of above-described embodiment, the present invention improves testing circuit 404, and two kinds of detection modes also are provided.As shown in Figure 4, testing circuit 404 comprises: first detection module 4041 is used in case when detecting described service board and not receiving main system clock, judge that interrupting appears in the main system clock that service board receives; And/or second detection module 4042, be used for when predetermined time Duan Shangjun detects described service board and do not receive described main system clock, judging that interrupting appears in the described main system clock that described service board receives.In the present embodiment, by different detection modes, can satisfy the demand of different business veneer.
Preferably, whether the second detection module 4042 occurs interrupting by the main system clock that receives on the following steps detection service board: do not receive described main system clock if detect described service board, then the opening timing device; Whether judgement all detects described service board and does not receive described main system clock in the timing cycle of described timer; Receive main system clock if in the timing cycle of described timer, detect described service board, judge that then interrupting does not appear in the main system clock that described service board receives.
Preferably, on the basis of each preferred embodiment of the present invention, clock switch device as shown in Figure 2 also comprises: be in the system clock unit (system clock unit 302 as shown in Figure 3) under the normal operating conditions, be used for providing described main system clock and described standby system clock.In this preferred embodiment, by limiting the state of system clock unit, so that the clock switch device in this preferred embodiment goes for the scene of the main system clock appearance interruption that the system clock unit operating state is normal and service board receives.
As a kind of selectable scheme, also can provide respectively main system clock and described standby system clock by two system clock unit, the present invention is not limited only to this.
Fig. 3 is the another kind of preferred structured flowchart according to the processing unit of the clock of the embodiment of the invention, as shown in Figure 3, comprises with lower unit; System clock unit 302, the two-way system clock that is used to service board to provide to be provided by host apparatus and stand-by equipment (that is, main system clock and standby system clock) is realized the control and management to service board; Clock selecting unit 304 is used for selecting one road system clock to offer service board from the two-way system clock that system clock unit 302 provides and uses; Clock detection unit 306, whether the main system clock that receives for detection of service board occurs interrupting, and the method that detects here can adopt the described method of above-described embodiment, does not repeat them here; Service Processing Unit 308 is used for processing and transmitting-receiving professional on the finishing service veneer; Control unit 310 when interrupting appears in the main system clock that is used for receiving at service board, is switched to standby system clock with main system clock, and will be transferred to service board for system clock; Communication unit 312 between plate, are used for realizing that system board to the management of business board, is the communication unit of service board and system clock unit 302.
Embodiment 2
On the basis of the clock switch device of Fig. 2-shown in Figure 4, the invention allows for a kind of preferred clock switch method, illustrate such as Fig. 5, it comprises the steps:
S502: whether the main system clock that the detection service board receives occurs interrupting;
S504: if interrupting appears in the main system clock that service board receives, then main system clock is switched to standby system clock;
S506: will be transferred to service board for system clock.
In above-mentioned preferred embodiment, when the main system clock appearance interruption that service board receives, realized switching of main preparation system clock, solved the problem that in the situation that the clock signal interruption occurs, can't realize the main preparation system clock switch in the prior art, thereby avoided because service disconnection or the veneer operation exception that the main preparation system clock causes unusually improves the equipment reliability of operation.
Whether occur interrupting in order to detect the main system clock that service board receives, the invention provides a kind of preferred detecting step, that is, detecting the step whether main system clock that service board receives occur interrupting comprises: whether the high frequency clock that frequency of utilization is higher than main system clock detects the main system clock that service board receives and occurs interrupting.
Owing to used frequency to be higher than the high frequency clock of main system clock, therefore, can judge in each clock cycle of main system clock whether the main system clock that service board receives occurs interrupting exactly by high frequency clock, thus the accuracy that has guaranteed to interrupt detection.Further, owing to used frequency to be higher than the high frequency clock of main system clock, the detection frequency can be set according to the actual requirements, for example, high frequency clock is the twice of the frequency of main system clock, supposes that each of main system clock is used high frequency clock sampling twice clock cycle, thereby when the value that samples when the clock cycle of continuous two high frequency clocks is respectively 0 and 1 (perhaps 1 and 0), it is normal to judge that main system clock receives, otherwise judges that interrupting appears in the main system clock reception.Suppose that each of main system clock uses high frequency clock sampling four times clock cycle, when thereby the value that samples when the clock cycle of continuous four high frequency clocks is respectively 0011 (perhaps being 1100,1001,0110), it is normal to judge that main system clock receives, otherwise judges that interrupting appears in the main system clock reception.As seen, the high frequency clock that is higher than main system clock by frequency of utilization detects can be so that the present invention be applicable to different scenes.
On the basis of above-described embodiment, the present invention is further improved detecting step, and following two kinds of detection modes also are provided, in order to satisfy the demand of different business veneer:
1) do not receive main system clock in case detect described service board, judge that then interrupting appears in the main system clock that service board receives.
In order to realize above-mentioned detection mode, as shown in Figure 6, clock switch method comprises the steps:
S602: system clock unit normal operation, the two-way system clock (that is, main system clock and standby system clock) that provides host apparatus and stand-by equipment to provide for service board;
S604: the main system clock that clock detection unit inspection service board receives;
S606: interrupting appears in the clock detection unit judges main system clock whether service board receives; If occur interrupting, then go to step S608, otherwise, go to step S604 and continue to detect; Preferably, can judge whether that by the detection method in above-described embodiment interrupting appears in the main system clock that service board receives, and does not repeat them here;
S608: in a single day the clock detection unit detects service board does not have reception to be dealt into main system clock, judges that then interrupting appears in main system clock, and records corresponding record value;
S610: control unit detects the record value that records in the clock detection unit;
S612: control unit judges whether to detect record value; If detect record value, then go to step S614, detect otherwise go to step S610;
S614; Main system clock is switched to standby system clock in control clock selecting unit, and the zero clearing record value.
In above-mentioned preferred embodiment, in case the clock detection unit detects service board and does not receive and be dealt into main system clock then judge that interrupting appears in main system clock, in time detect the interruption of main system clock, the real-time reversion main system clock, shortened to greatest extent the time that service board does not receive main system clock, simultaneously, reduced service damage or the veneer operation exception that causes because of the master/backup clock abnormal signal.
Preferably, in above-mentioned process step S608, clock detection unit judges main system clock is had no progeny in occurring, the clock detection unit begins counting, record once after counting reached set point, guarantee to judge whether exactly that interrupting appears in main system clock, and be convenient to the detection of control unit system, to avoid continually exchanging system clock of system's blindness.
2) do not receive described main system clock if detect described service board at predetermined time Duan Shangjun, judge that then interrupting appears in the described main system clock that described service board receives.
In order to realize above-mentioned detection mode, as shown in Figure 7, clock switch method comprises the steps:
S702: system clock unit normal operation, the two-way system clock (that is, main system clock and standby system clock) that provides host apparatus and stand-by equipment to provide for service board;
S704: the main system clock that clock detection unit inspection service board receives;
S706: interrupting appears in the clock detection unit judges main system clock whether service board receives; If occur interrupting, then go to step S708, otherwise, go to step S704 and continue to detect; The process that interrupting appears in the clock detection unit judges of preferably, mentioning the here main system clock whether service board receives refers to: whether the clock detection unit detects service board at predetermined time Duan Shangjun does not have reception to be dealt into main system clock; Preferably, can judge whether that by the detection method in above-described embodiment interrupting appears in the main system clock that service board receives, and does not repeat them here;
S708: the clock detection unit judges goes out to detect service board at predetermined time Duan Shangjun and do not receive and be dealt into main system clock (that is, judge main system clock and occur interrupting), records corresponding record value;
S710: control unit detects the record value of clock detection unit;
S712: control unit judges whether to detect record value; If detect record value, then go to step S714, detect otherwise go to step S710
S714; Main system clock was switched to standby system clock in control clock selecting unit after control unit detected record value, and the zero clearing record value.
In above-mentioned preferred step S706, initial clock detection unit inspection does not receive main system clock to service board, and keep detecting always, as keep still detecting service board behind the 3-5 microsecond clock and do not receive main system clock, judge that then interrupting appears in main system clock, within the time period that allows, continue like this to detect service board and whether receive main system clock, guarantee whether main system clock is occurred interrupting making accurately judging, to avoid blindly switching continually main system clock.
Certainly, 3-5 microsecond clock among the above-mentioned steps S706 is a kind of preferred embodiment, the present invention is not limited only to this, for example, can also judge within the time period of second level or Millisecond whether the main system clock that receives occurs interrupting, detect the demand that main system clock interrupts in the distinct device in order to satisfy.
The step whether main system clock that preferably, receives on the detection service board occurs interrupting comprises: do not receive main system clock if detect service board, then the opening timing device; Whether judgement all detects service board and does not receive main system clock in the timing cycle of timer; Receive main system clock if in the timing cycle of timer, detect service board, judge that then interrupting does not appear in the main system clock that service board receives.Like this, guarantee to judge whether exactly that interrupting appears in main system clock, and be convenient to the detection of control unit system, to avoid continually exchanging system clock of system's blindness.
Preferably, the entity that described main system clock is provided in above-mentioned each preferred embodiment is working properly.In this preferred embodiment, provide the state of the entity of described main system clock by restriction, so that the clock switch method in this preferred embodiment goes for providing the main system clock that the entity operating state is normal and service board receives of described main system clock the scene of interrupting to occur.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a clock switch method is characterized in that, comprising:
Whether the main system clock that the detection service board receives occurs interrupting;
If interrupting appears in the described main system clock that described service board receives, then described main system clock is switched to standby system clock;
Described standby system clock is transferred to described service board.
2. method according to claim 1 is characterized in that, the step whether main system clock that receives on the detection service board occurs interrupting comprises:
Do not receive main system clock in case detect described service board, judge that then interrupting appears in the main system clock that service board receives.
3. method according to claim 1 is characterized in that, the step whether main system clock that receives on the detection service board occurs interrupting comprises:
Do not receive described main system clock if detect described service board at predetermined time Duan Shangjun, judge that then interrupting appears in the described main system clock that described service board receives.
4. method according to claim 1 is characterized in that, the step whether main system clock that receives on the detection service board occurs interrupting comprises:
Do not receive described main system clock if detect described service board, then the opening timing device;
Whether judgement all detects described service board and does not receive described main system clock in the timing cycle of described timer;
Receive main system clock if in the timing cycle of described timer, detect described service board, judge that then interrupting does not appear in the main system clock that described service board receives.
5. each described method in 4 according to claim 1 is characterized in that, provides the entity of described main system clock working properly.
6. each described method in 4 according to claim 1, it is characterized in that, detect the step whether main system clock that service board receives occur interrupting and comprise: whether the high frequency clock that frequency of utilization is higher than described main system clock detects the main system clock that service board receives and occurs interrupting.
7. a clock switch device is characterized in that, comprising:
The clock detection unit, whether the main system clock that receives for detection of service board occurs interrupting;
Control unit is used for when interrupting appears in the described main system clock that described service board receives described main system clock being switched to standby system clock, and described standby system clock is transferred to described service board.
8. device according to claim 7 is characterized in that, described clock detection unit comprises:
First detection module is used in case when detecting described service board and not receiving main system clock, judge that interrupting appears in the main system clock that service board receives.
9. device according to claim 7 is characterized in that, described clock detection unit comprises:
The second detection module is used for judging that interrupting appears in the described main system clock that described service board receives when predetermined time Duan Shangjun detects described service board and do not receive described main system clock.
10. each described device in 9 according to claim 7 is characterized in that, also comprises: be in the system clock unit under the normal operating conditions, be used for providing described main system clock and described standby system clock.
11. each described device in 9 according to claim 7 is characterized in that described clock detection unit comprises:
High frequency clock circuit is higher than the clock of described main system clock for generation of frequency;
Testing circuit is used for detecting the main system clock that service board receives with the clock that described high frequency clock circuit produces and interruption whether occurs.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110277619.3A CN103001789B (en) | 2011-09-19 | 2011-09-19 | Clock switch method and device |
| PCT/CN2012/076351 WO2013040909A1 (en) | 2011-09-19 | 2012-05-31 | Clock switchover method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110277619.3A CN103001789B (en) | 2011-09-19 | 2011-09-19 | Clock switch method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103001789A true CN103001789A (en) | 2013-03-27 |
| CN103001789B CN103001789B (en) | 2017-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110277619.3A Expired - Fee Related CN103001789B (en) | 2011-09-19 | 2011-09-19 | Clock switch method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103001789B (en) |
| WO (1) | WO2013040909A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301744A (en) * | 2015-05-14 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of method and device of clock board clock pretection switch |
| CN110149163A (en) * | 2019-03-22 | 2019-08-20 | 珠海高凌信息科技股份有限公司 | A kind of method and circuit of the switching of clock system redundancy |
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| US6516422B1 (en) * | 1999-05-19 | 2003-02-04 | Sun Microsystems, Inc. | Computer system including multiple clock sources and failover switching |
| CN1484384A (en) * | 2003-06-25 | 2004-03-24 | Ut斯达康(中国)有限公司 | Smooth clock switching method and clock system |
| CN101170754A (en) * | 2007-11-27 | 2008-04-30 | 中兴通讯股份有限公司 | A board booting method in case of clock loss of GPS |
| CN101521565A (en) * | 2008-02-26 | 2009-09-02 | 华为技术有限公司 | Main/standby system clock seamless switching method, device and communication equipment |
| CN101840357A (en) * | 2010-04-08 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Clock backup method and clock backup device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7043655B2 (en) * | 2002-11-06 | 2006-05-09 | Sun Microsystems, Inc. | Redundant clock synthesizer |
| US7911240B1 (en) * | 2007-05-17 | 2011-03-22 | Altera Corporation | Clock switch-over circuits and methods |
-
2011
- 2011-09-19 CN CN201110277619.3A patent/CN103001789B/en not_active Expired - Fee Related
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2012
- 2012-05-31 WO PCT/CN2012/076351 patent/WO2013040909A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6516422B1 (en) * | 1999-05-19 | 2003-02-04 | Sun Microsystems, Inc. | Computer system including multiple clock sources and failover switching |
| CN1484384A (en) * | 2003-06-25 | 2004-03-24 | Ut斯达康(中国)有限公司 | Smooth clock switching method and clock system |
| CN101170754A (en) * | 2007-11-27 | 2008-04-30 | 中兴通讯股份有限公司 | A board booting method in case of clock loss of GPS |
| CN101521565A (en) * | 2008-02-26 | 2009-09-02 | 华为技术有限公司 | Main/standby system clock seamless switching method, device and communication equipment |
| CN101840357A (en) * | 2010-04-08 | 2010-09-22 | 北京星网锐捷网络技术有限公司 | Clock backup method and clock backup device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106301744A (en) * | 2015-05-14 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of method and device of clock board clock pretection switch |
| CN106301744B (en) * | 2015-05-14 | 2020-04-28 | 中兴通讯股份有限公司 | Clock protection switching method and device for clock board |
| CN110149163A (en) * | 2019-03-22 | 2019-08-20 | 珠海高凌信息科技股份有限公司 | A kind of method and circuit of the switching of clock system redundancy |
| CN110149163B (en) * | 2019-03-22 | 2021-04-20 | 珠海高凌信息科技股份有限公司 | Redundancy switching circuit of standard digital clock system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013040909A1 (en) | 2013-03-28 |
| CN103001789B (en) | 2017-09-29 |
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