CN1393748A - Switching equipment between master and stand-by circuits and its method - Google Patents
Switching equipment between master and stand-by circuits and its method Download PDFInfo
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- CN1393748A CN1393748A CN 01121975 CN01121975A CN1393748A CN 1393748 A CN1393748 A CN 1393748A CN 01121975 CN01121975 CN 01121975 CN 01121975 A CN01121975 A CN 01121975A CN 1393748 A CN1393748 A CN 1393748A
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Abstract
A switching device for two circuits (primary and secondary circuits) is composed of a unit for detecting the working state of primary circuit board and generating the related signal, a unit of detecting the duty state of secondary circuit board and generating the related signal, a unit for detecting the current-standby state of secondary one and generating the related signal, and a uint for generating the current-standby control signal of primary one according to the above-mentioned three signals. Its switching method for two circuits is also disclosed.
Description
The present invention relates to a kind of master and stand-by circuits switching equipment and method, relate in particular to master and stand-by circuits switching equipment and method under a kind of veneer thermal backup state.
Can improve reliability of system operation effectively in system design adopted activestandby hot backup Redundancy Design technology, wherein activestandby hot backup is meant that two identical veneers work simultaneously, a main usefulness, and another piece is standby.The master provides the control signal that links to each other with this veneer with veneer, and standby board is by inner ternary its output of control.The active and standby cross complaint signal of these two veneers connects by standby plate, and when main veneer broke down, system can realize switching automatically, guarantees reliability.
The common master and stand-by circuits scheme of switching mainly contains two kinds: a kind of is the main type that is equipped with, and another kind is to be equipped with to fall principal mode.These two kinds of master and stand-by circuits have been shown in Fig. 1 and Fig. 2 have switched the schematic circuit diagram of scheme.As illustrated in fig. 1 and 2, the circuit of these two kinds of schemes all adopts the R-S trigger, guarantees the active and standby signal mutual exclusion of two veneers by interlocking signal between plate, thereby reaches the main main purpose that is equipped with or is equipped with to fall.
Though top two kinds of schemes of switching can realize the purpose that master and stand-by circuits is switched, still there is deficiency in they, and it shows as:
1. the main type that is equipped with: have only earlier to send and switch order and just can implement switching action to main board.If main board can't be set up with backstage or main frame and communicate by letter, then can't realize switching, need circuit to possess hardware auto switching function or reset function.
2. be equipped with to fall principal mode: have only to send to standby plate earlier and switch order, after standby plate was switched to main board, original main board just can be switched into standby plate.The major defect that is produced is like this:
1) when the plug standby plate, because the standby plate state is uncertain, main phenomenon can appear robbing fully.Standby plate during insertion, general less stable, if this moment as main with breaking down.
2) in a single day catastrophic failure appears in main board, just can't pour standby plate immediately automatically into, must control by main frame or backstage, the bigger mistiming can occur like this, thereby may bring the consequence that can't estimate.
Therefore, in order to solve above two kinds of deficiencies of switching scheme, the present invention proposes a kind of novel main board and switch scheme.
Core content of the present invention is a kind of novel master and stand-by circuits switching equipment of realizing based on following master and stand-by circuits switch function, and it can possess the backstage or main frame is switched and two kinds of functions of hardware auto switching:
1) during system power-on reset, two plates keep stand-by state simultaneously, to avoid the main and standby competition conflict.
2) system power on stable after, guarantee that major trough position veneer obtains main with power.
3) any fault occurs in case detect arbitrary single plate hardware, can change to plate automatically.After showing that system powers on, main standby plate is in the status of equity, and they all have warm standby function.Single plate hardware fault point detects, and open plate level state-detection mechanism is provided.
4) backstage or main frame send and switch order and can implement switching action.Provide system to the software setting data-interface of single board main/standby, possess the Operation and Maintenance function with state.
5) during charged plug, after the veneer plugged do not seize main with power.
6) in a single day the other side's plate is extracted, the unprincipled master's usefulness that rises to of this plate.
According to an invention of the present invention, a kind of master and stand-by circuits switching equipment of switching between with veneer and standby board main of being used for is provided, has it is characterized in that comprising: the duty that is used to detect this plate is installed to produce first of this plate duty detection signal; The state on the throne that is used to detect plate installs second of plate state detection signal on the throne to produce; Be used to detect to plate active and standby with state to produce active and standby the 3rd device of plate with state detection signal; And receive and according to respectively from described plate duty detection signal of described first, second and the 3rd device, described to plate state detection signal on the throne and described to the active and standby state detection signal of use of plate, produce active and standby active and standby the 4th device of using with state of using state control signal of this plate of this plate of control.
According to another invention of the present invention, a kind of master and stand-by circuits reverse method of switching between with veneer and standby board main of being used for is provided, it is characterized in that may further comprise the steps: the duty that detects this plate is to produce this plate duty detection signal; Detection to the state on the throne of plate to produce to plate state detection signal on the throne; Detection to plate active and standby with state to produce to the active and standby state detection signal of using of plate; And if described plate duty detection signal indicates this plate duty normal, then produce the active and standby state control signal of using of this plate that this plate of control master uses, if described plate duty detection signal indicates this plate duty unusual, and on the throne and active and standby standby to plate to plate state detection signal indication on the throne with the state detection signal indication to plate to plate, then produce the standby active and standby state control signal of using of this plate of this plate of control.
From the following drawings and in conjunction with description, will make those skilled in the art understand the present invention better to preferred embodiment of the present invention.
Fig. 1 is the synoptic diagram that the master of prior art is equipped with the type negater circuit;
Fig. 2 is the synoptic diagram that is equipped with the negater circuit of falling the principal mode of prior art;
Fig. 3 is the schematic block diagram according to master and stand-by circuits switching equipment of the present invention;
Fig. 4 is the logical circuitry according to master and stand-by circuits switching equipment of the present invention;
Fig. 5 is the synoptic diagram according to the applied environment of master and stand-by circuits switching equipment of the present invention;
Fig. 6 is the process flow diagram that illustrates according to an embodiment of the operation of master and stand-by circuits switching equipment of the present invention; And
Fig. 7 is the process flow diagram that illustrates according to another embodiment of the operation of master and stand-by circuits switching equipment of the present invention.
Describe preferred embodiment of the present invention below with reference to accompanying drawing, but those skilled in the art should be understood that these accompanying drawings just schematically, but not limitation of the present invention.
Fig. 3 illustrates the schematic block diagram according to the master and stand-by circuits switching equipment 100 of a preferred embodiment of the present invention.As shown in Figure 3, master and stand-by circuits switching equipment 100 mainly comprise this plate working state detection device 101, to plate condition checkout gear 102 on the throne, merge device 106 with condition checkout gear 103, testing result to plate is active and standby.
Here, this plate be relative notion to plate, when carrying out the master and stand-by circuits switching operation, the number of delivering a letter mutually between between main board and standby plate of main board and standby plate master and stand-by circuits switching equipment 100 separately.
As shown in Figure 3, this plate working state detection device 101 receives this plate duty indication from this plate, to detect the duty of this plate.This plate working state detection device 101 with detected plate working state signal OS (promptly; this plate duty is normal or this plate duty is unusual) output to testing result and merge device 106, with from merging to plate condition checkout gear 102 on the throne and to the active and standby testing result of plate with condition checkout gear 103.
To plate condition checkout gear 102 on the throne by receiving from the state on the throne of plate being indicated the state on the throne that detects plate.Equally, plate condition checkout gear 102 on the throne is outputed to testing result merging device 106 with detected to plate status signal PS on the throne (that is, on the throne or not on the throne to plate to plate).
To plate active and standby with condition checkout gear 103 by receiving from the active and standby active and standby state of using that detects plate of indicating with state to plate.Then, to plate active and standby with condition checkout gear 103 will be detected to plate active and standby with status signal QS (that is, to the plate master with or standby to plate) export to testing result merging device 106.
At last, testing result merges device 106 according to output signal OS, PS and QS from these three pick-up units 101,102 and 103, produces the active and standby state control signal RS that uses of this plate that is used to control the operation of this plate.For example, when the main board duty just often, regardless of active and standby with state and to plate state on the throne to plate, testing result merges that this plate that device 106 produced is active and standby all controls this plate master usefulness with state control signal RS.And when the main board duty unusual, to plate when on the throne and standby, testing result merges this plate that device 106 produced, and active and standby to control this plate with state control signal RS standby.Correspondingly, usefulness is led in original standby plate is become.
This plate working state signal OS is ' 1 ' when for example, supposing the normal running of this plate; And this plate duty when unusual this plate working state signal OS be ' 0 '.In addition, suppose to plate when on the throne to plate status signal PS on the throne to be ' 0 '; Otherwise, if not on the throne to plate, would be ' 1 ' then to plate status signal PS on the throne.If standby to plate, then active and standby to plate is ' 1 ' with status signal QS.If to plate master usefulness, then active and standby to plate is ' 0 ' with status signal QS.If this plate is active and standby to be ' 1 ' with state control signal RS, it is standby then controlling this plate.If this plate is active and standby to be ' 0 ' with state control signal RS, then controlling this plate is main using.Those skilled in the art are appreciated that signal used in the present invention and logic state thereof are not limited thereto.
For example, if this plate working state signal OS is ' 1 ', indicate this plate duty normal, then regardless of other two signals, this plate of testing result merging device 106 outputs is active and standby to be ' 0 ' with state control signal RS, and controlling this plate then is main using.
On the other hand, if this plate working state signal OS is ' 0 ', indicate this plate duty unusual, then when on the throne and standby (promptly to plate to plate, status signal PS on the throne is ' 0 ' to plate, active and standby to plate is ' 1 ' with status signal QS) time, this plate of testing result merging device 106 outputs is active and standby to be ' 1 ' with state control signal RS, it is standby controlling this plate then.In the case, originally standby becomes main using to plate.
In order to make master and stand-by circuits switching equipment 100 can carry out switch function better, this master and stand-by circuits switching equipment 100 links to each other with a CPU (not shown) via a CPU control interface 105.Thereby whether CPU can shield/open the auto switching operation thereby issue control command control by CPU by the operation of each pick-up unit in the CPU control interface 105 shielding/opening master and stand-by circuits switching equipments 100.
In addition, active and standby also can being provided with negater circuit 100 delayed start-up control device 104.Slow start-up control device 104 can produce a slow start-up control signal that merges device 106 to testing result, thereby guarantee that veneer is when charged plug, the back is inserted the veneer of machine frame and is not seized the main with power of former veneer, if promptly former normal working of single board, indicate this plate master to use even this plate of the veneer that insert the back is active and standby with state control signal RS, the veneer that insert the back is not worked yet, and can not seize main with power from the veneer of then inserting.
Below, describe in detail during the master and stand-by circuits switching equipment powerup/reset and switching action under the abnormal work state with reference to figure 4.Wherein Fig. 4 illustrates an example according to master and stand-by circuits switching equipment 100 embodiment illustrated in fig. 3.As described below, define the object lesson of some required parameters of master and stand-by circuits switching equipment of the present invention, but the invention is not restricted to this.Those skilled in the art can determine switching of master and stand-by circuits with other parameter as required.
In Fig. 4:
/ RS: Board Power up reset signal;
ID: groove position (that is the physical location of veneer in machine frame) number under the veneer;
ID=1: the groove position is 1# under this plate;
ID=0: the groove position is 0# under this plate;
D1 and D0: backstage/main frame is provided with single board main/standby and uses the status data position;
D0=1: backstage/main frame is provided with the single board main/standby state, shielding single plate hardware auto switching function;
D1=1: this plate master uses;
D1=0: this plate is standby;
D0=0: open single plate hardware auto switching function;
This moment, D1 data bit state and single board main/standby were irrelevant with state;
ADDR: backstage/host address signal;
/ WR: backstage/main frame read-write;
L_Status: single-board operation state validity indication;
L_Status=1: single-board operation state is normal;
L_Status=0: single-board operation state is unusual;
C_/MS: indicate with state to plate is active and standby;
C_/MS=1: standby to plate;
C_/MS=0: the plate master is used;
C_DACM: to plate state indication on the throne;
C_DACM=1: not on the throne to plate;
C_DACM=0: on the throne to plate;
L_/MS: this plate is active and standby indicates with state;
L_/MS=1: this plate is standby;
L_/MS=0: this plate master uses;
This circuit starts by following order switches flow process:
When 1) just having powered on, the trigger D3 signal/RS set that is reset is ' 1 ', and making main is ' 1 ' with signal L_/MS, by the blockade of slow start-up control signal (Start) releasing to L_/MS, whether promptly to the clamping action of this signal, because when just having powered on, this signal is clamped to ' 1 ' level.Power on a moment, when single board state was also unstable, two parts are not main to be used.
2) ID and/RS acting in conjunction make trigger D2 output signal, be ' 0 ' for the 0# plate, are ' 1 ' for the 1# plate, and trigger D1 exports ' 1 '.Power on after a period of time, when active/standby two boards is all on the throne, C_DACM=' 0 ', C_/MS=' 1 '.The L_/MS that produces is ' 0 ' for the 0# plate, is ' 1 ' for the 1# plate, the back 0# plate master usefulness that guarantees to power on, and the 1# plate is standby.
When 3) opening hardware auto switching function, D0 position output ' 0 ' will be blocked with door AND1, and L_Status is this board status signal, plate just often is ' 1 ', in case this plate fault, rejection gate NOR output ' 1 ', or door OR4 output ' 1 ', make L/MS=' 1 ', if at this moment standby plate is normal, make the L_/MS=' 0 ' of standby plate automatically, thereby standby plate becomes main using.During L_Status=' 0 ', L_/MS unconditionally is ' 1 ' (that is, main board is standby).
4) during charged plug, because the effect of trigger D3, the veneer that insert the back is clamped to ' 1 ' level when just having inserted, and is in stand-by state, therefore can not make to be in main veneer with state and to enter stand-by state by mistake.
5) in a single day the other side's plate is extracted, and C_DACM=' 1 ', L_/MS unconditionally are ' 0 ', unprincipled main the using of this plate.
6) when the D0 position exported ' 1 ', the conductively-closed of auto switching function can only be switched by veneer by backstage/main frame transmitting order to lower levels, switches order and issues by the D1 position.
As mentioned above, the circuit of Fig. 4 has been realized master and stand-by circuits switch function of the present invention.Those skilled in the art are appreciated that and the invention is not restricted to specific example as described herein, and can realize that other circuit of identical function replaces.
Master and stand-by circuits switching equipment of the present invention and method are applicable to the master and stand-by circuits switching strategy of baseband operations/maintenance/timing veneer.Figure 5 illustrates the design environment configuration that the present invention is suitable for.As shown in Figure 5, this configuration packet vinculum road interface unit 2,4 three relatively independent functional units of Operation and Maintenance Unit 5 (comprising main processor unit 3) and major clock unit, master and stand-by circuits switch function described in the present invention is realized in parts 1, the ruling result that master and stand-by circuits is switched represents by signal E, A, B, C represent respectively that the link reason is switched, the OMU reason is switched and the clock reason is switched testing result, and D represents backstage/host data interface.
Below, with reference to figure 6 and 7 operation according to master and stand-by circuits switching equipment of the present invention is described, wherein Fig. 6 illustrates an embodiment of the operation of master and stand-by circuits switching equipment, and Fig. 7 illustrates another embodiment of its operation.
As shown in Figure 6, at first, master and stand-by circuits switching equipment 100 detects the duty (step S1) of this plate.If it is normal to detect this plate duty in step S1, produce then that this plate is active and standby controls this plate master with (step S2) with state control signal, finish the operation (step S6) of master and stand-by circuits switching equipment 100 then.
If it is unusual to detect this plate duty in step S1, then continue to detect state on the throne (step S3) to plate.If in step S3, detect not on the thronely, then finish the operation (step S6) of master and stand-by circuits switching equipment 100 to plate.Perhaps, also can be before end operation, with this result notification CPU, with this result notification user.
If in step S3, detect on the thronely, then continue to detect active and standby to plate with state (step S4) to plate.If in step S4, detect usefulness, then finish the operation (step S6) of master and stand-by circuits switching equipment 100 to the plate master.Perhaps, also can be before end operation, with this result notification CPU, with this result notification user.
If in step S3, detect standbyly to plate, then produce active and standby this plate of carrying out with state control signal of this plate to plate switching operation (S5), then, finish the operation (step S6) of master and stand-by circuits switching equipment 100.
Another embodiment of the operation of foundation shown in Figure 7 master and stand-by circuits switching equipment 100 of the present invention.
As shown in Figure 7, at first, detect this plate working state signal OS (step S11) respectively, to plate status signal PS on the throne (S12) and active and standby with state QS (step S13) to plate.Notice that, these three are detected step S11, S12 and S13 can carry out successively by a certain order, also can carry out synchronously here.That is, when detecting this plate duty, detect to plate state on the throne with to the active and standby state of using of plate.
Then, judge detected plate working state signal OS,, to produce control signal (step S14) to plate status signal PS on the throne with to the active and standby status signal QS that uses of plate.If S14 detects OS=1 in step, promptly this plate is working properly, produces then that this plate is active and standby controls this plate master with (step S15) with state control signal, then, finishes the operation (S17) of master and stand-by circuits switching equipment 100.Perhaps, also can be before end operation, with this result notification CPU, with this result notification user.
If detect OS=0 and PS=1 or QS=0 at step S14, promptly this plate operation irregularity and not on the throne or to plate master usefulness to plate then finishes the operation (S17) of master and stand-by circuits switching equipment 100.Perhaps, also can be before end operation, with this result notification CPU, with this result notification user.
If detect OS=0 and PS=0 at step S14, QS=1, i.e. this plate operation irregularity and on the throne and standby to plate to plate, then master and stand-by circuits switching equipment 100 is carried out these plates to plate switching operation (step S16), then, end operation (S17).
As mentioned above, in the operation of master and stand-by circuits switching equipment, before carrying out the switching operation of this plate, can add a slow start-up control signal, with slow this switching operation that starts to plate.
According to master and stand-by circuits switching equipment of the present invention and method, that introduces in circuit that reset signal and slow enabling signal effectively avoided reseting period active and standbyly uses the board status conflict, and to the influence of affiliated system.
Though described the present invention by way of example and with reference to specific embodiment, can understand, can make amendment and/or improve, and do not deviate from the scope of appended claims.
Claims (8)
1. one kind is used for the master and stand-by circuits switching equipment switched between with veneer and standby board main, it is characterized in that comprising:
Be used to detect the duty of this plate to produce first device of this plate duty detection signal;
The state on the throne that is used to detect plate installs second of plate state detection signal on the throne to produce;
Be used to detect to plate active and standby with state to produce active and standby the 3rd device of plate with state detection signal; And
Receive and according to respectively from described plate duty detection signal of described first, second and the 3rd device, described to plate state detection signal on the throne and described to the active and standby state detection signal of use of plate, produce active and standby active and standby the 4th device of using with state of using state control signal of this plate of this plate of control.
2. master and stand-by circuits switching equipment as claimed in claim 1 is characterized in that also comprising the relaxed starter of linking described the 4th device, and described relaxed starter is used to produce the slow slow enabling signal that starts the master and stand-by circuits switching operation.
3. master and stand-by circuits switching equipment as claimed in claim 1 or 2, it is characterized in that also comprising the CPU control interface of linking described first, second and the 3rd device respectively, described CPU control interface is according to from the instruction shielding of a CPU or the master and stand-by circuits switching operation of open master and stand-by circuits switching equipment.
4. one kind is used for the master and stand-by circuits reverse method switched between with veneer and standby board main, it is characterized in that may further comprise the steps:
The duty that detects this plate is to produce this plate duty detection signal;
Detection to the state on the throne of plate to produce to plate state detection signal on the throne;
Detection to plate active and standby with state to produce to the active and standby state detection signal of using of plate; And
If described plate duty detection signal indicates this plate duty normal, then produce the active and standby state control signal of using of this plate that this plate of control master uses, if described plate duty detection signal indicates this plate duty unusual, and on the throne and active and standby standby to plate to plate state detection signal indication on the throne with the state detection signal indication to plate to plate, then produce the standby active and standby state control signal of using of this plate of this plate of control.
5. master and stand-by circuits reverse method as claimed in claim 4, it is characterized in that carrying out synchronously described plate duty detection signal detect step, described to plate state detection signal on the throne from step with describedly detect step with state detection signal to plate is active and standby.
6. as claim 4 or 5 described master and stand-by circuits reverse methods, it is characterized in that also comprising according to control signal from CPU, described plate duty of shielding/execution detection signal detection step, described to plate state detection signal on the throne from step and/or describedly detect step with state detection signal to plate is active and standby.
7. as claim 4 or 5 described master and stand-by circuits reverse methods, it is characterized in that also comprising that the slow master of startup uses the switching operation between veneer and the standby board according to a slow enabling signal.
8. master and stand-by circuits reverse method as claimed in claim 6 is characterized in that also comprising that the slow master of startup uses the switching operation between veneer and the standby board according to a slow enabling signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01121975 CN1249548C (en) | 2001-06-22 | 2001-06-22 | Switching equipment between master and stand-by circuits and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01121975 CN1249548C (en) | 2001-06-22 | 2001-06-22 | Switching equipment between master and stand-by circuits and its method |
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| Publication Number | Publication Date |
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| CN1393748A true CN1393748A (en) | 2003-01-29 |
| CN1249548C CN1249548C (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01121975 Expired - Fee Related CN1249548C (en) | 2001-06-22 | 2001-06-22 | Switching equipment between master and stand-by circuits and its method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100459447C (en) * | 2005-06-30 | 2009-02-04 | 华为技术有限公司 | Method for realizing master and spare conversion of distributing connection equipment |
| CN100477547C (en) * | 2006-03-02 | 2009-04-08 | 迈普（四川）通信技术有限公司 | Telecommunication apparatus master-slave switching method and telecommunication apparatus thereof |
| WO2009052741A1 (en) * | 2007-10-16 | 2009-04-30 | Huawei Technologies Co., Ltd. | A micro telecommunications computing architecture system and a method for reliability management thereof |
| CN100507585C (en) * | 2006-08-24 | 2009-07-01 | 华为技术有限公司 | Method and system for detecting single-plate on position |
| CN101430550B (en) * | 2007-03-30 | 2010-12-01 | 哈尔滨工程大学 | Switch control method of engine redundancy electric-control system |
| CN101145800B (en) * | 2007-10-19 | 2011-03-02 | 中兴通讯股份有限公司 | A method and device for improving reliable switching of clock board |
| CN102073562A (en) * | 2010-12-31 | 2011-05-25 | 山石网科通信技术（北京）有限公司 | Hardware-based main/standby switch arbitration method |
| CN109164787A (en) * | 2018-08-31 | 2019-01-08 | 杭州和利时自动化有限公司 | A kind of analog signals acquisition device |
| CN109920370A (en) * | 2019-04-17 | 2019-06-21 | 东莞阿尔泰显示技术有限公司 | A kind of novel LED display screen system backup circuit and its control method |
| WO2021083158A1 (en) * | 2019-10-31 | 2021-05-06 | 中兴通讯股份有限公司 | Method for protecting active and standby states of single board, and communication device |
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2001
- 2001-06-22 CN CN 01121975 patent/CN1249548C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459447C (en) * | 2005-06-30 | 2009-02-04 | 华为技术有限公司 | Method for realizing master and spare conversion of distributing connection equipment |
| CN100477547C (en) * | 2006-03-02 | 2009-04-08 | 迈普（四川）通信技术有限公司 | Telecommunication apparatus master-slave switching method and telecommunication apparatus thereof |
| CN100507585C (en) * | 2006-08-24 | 2009-07-01 | 华为技术有限公司 | Method and system for detecting single-plate on position |
| CN101430550B (en) * | 2007-03-30 | 2010-12-01 | 哈尔滨工程大学 | Switch control method of engine redundancy electric-control system |
| WO2009052741A1 (en) * | 2007-10-16 | 2009-04-30 | Huawei Technologies Co., Ltd. | A micro telecommunications computing architecture system and a method for reliability management thereof |
| CN101415127B (en) * | 2007-10-16 | 2011-07-27 | 华为技术有限公司 | Minitype universal hardware platform architecture system for telecom and calculation, and reliability management method |
| CN101145800B (en) * | 2007-10-19 | 2011-03-02 | 中兴通讯股份有限公司 | A method and device for improving reliable switching of clock board |
| CN102073562A (en) * | 2010-12-31 | 2011-05-25 | 山石网科通信技术（北京）有限公司 | Hardware-based main/standby switch arbitration method |
| CN102073562B (en) * | 2010-12-31 | 2014-08-20 | 山石网科通信技术有限公司 | Hardware-based main/standby switch arbitration method |
| CN109164787A (en) * | 2018-08-31 | 2019-01-08 | 杭州和利时自动化有限公司 | A kind of analog signals acquisition device |
| CN109920370A (en) * | 2019-04-17 | 2019-06-21 | 东莞阿尔泰显示技术有限公司 | A kind of novel LED display screen system backup circuit and its control method |
| WO2021083158A1 (en) * | 2019-10-31 | 2021-05-06 | 中兴通讯股份有限公司 | Method for protecting active and standby states of single board, and communication device |
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| CN1249548C (en) | 2006-04-05 |
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