CN107948106A - A kind of method and apparatus of the main power board of selection for interchanger - Google Patents
A kind of method and apparatus of the main power board of selection for interchanger Download PDFInfo
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- CN107948106A CN107948106A CN201711185590.XA CN201711185590A CN107948106A CN 107948106 A CN107948106 A CN 107948106A CN 201711185590 A CN201711185590 A CN 201711185590A CN 107948106 A CN107948106 A CN 107948106A
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- Prior art keywords
- power board
- state value
- board
- activestandby state
- status
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/557—Error correction, e.g. fault recovery or fault tolerance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
Abstract
The present invention provides a kind of method for selecting main power board, comprises the following steps：Obtain the first activestandby state value of the first power board and the second activestandby state value of the second power board, the first activestandby state value and the second activestandby state value value range are all binary number 1 and 0, a main exchange board status of correspondence in the binary number 1 and 0, another corresponds to standby exchange board status；Value after first activestandby state value is negated and the second activestandby state value is done and computing, obtains the 3rd activestandby state value；When definite 3rd activestandby state value corresponds to standby exchange board status, main power board is the first power board；When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board.In the method, it is thus only necessary to two binary numbers are carried out with the operation of " negating " and "AND", it is seen then that the time it takes is short, efficient, can effectively reduce the time that interchanger is stopped.
Description
Technical field
The present invention relates to a kind of method of network communication technology field, more particularly to main power board of selection for interchanger
And device.
Background technology
Interchanger is the core equipment in network service, once breaking down, whole network will paralyse, it is therefore desirable to hand over
Change planes with high reliability；In practice, electronic hardware may break down, and in order to improve the reliability of interchanger, exchange
Some core electron hardware in machine are usually equipped with double, one of to keep working status, once event occurs in this
Barrier, another as backup will start at once, substitutes that break down and works on, so that exchanging equipment
There is the ability of continuous firing；It is understood that during switching, exchange opportunity is stopped, and therefore, switching is spent
Time it is more short better.
In the interchanger with backup functionality, two power boards and some interface boards, two power boards are usually provided with
In one be main power board, another is standby power board；In normal work, data switching switch connects some interface boards
Onto main power board, to complete the data exchanging function of interchanger.In use, once former main power board breaks down, original is main
Power board can concede major state just to be used to former standby power board, former standby power board as new main power board；It is understood that
At this time, it is also necessary to control data switching switch that some interface boards are connected on new main power board.In the prior art, this is flowed
Journey is usually：Their activestandby state value can be all sent to PLD by new main power board and new standby power board（Programmable
Logic Device, programmable logic device）Device, PLD devices can judge the position of new main power board, CPU（Central
Processing Unit, central processing unit）Data channel is controlled to be connected to some interface boards according to the position of main power board
On new main power board.As it can be seen that in prior art solutions, it is necessary to the participation of PLD devices and CPU, system complex, whole system
Cost is also higher；And processing speed is slow, the time it takes is longer.
Therefore, new main power board can quickly be selected from two power boards by designing one kind（I.e. without generation event
The power board of barrier）And the method that some interface boards are quickly connected to new main power board, just become one and urgently to be resolved hurrily ask
Topic.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus of the main power board of selection for interchanger.
In order to realize the foregoing invention first purpose, an embodiment of the present invention provides a kind of side for selecting main power board
Method, comprises the following steps：Obtain the first activestandby state value of the first power board and the second activestandby state value of the second power board, institute
It is all binary number 1 and 0 to state the first activestandby state value and the second activestandby state value value range, in the binary number 1 and 0
One main exchange board status of correspondence, another corresponds to standby exchange board status；Value after first activestandby state value is negated and
Two activestandby state values are done and computing, obtain the 3rd activestandby state value；Standby exchange board status is corresponded in definite 3rd activestandby state value
When, main power board is the first power board；When definite 3rd activestandby state value corresponds to main exchange board status, main power board is second
Power board.
Further as an embodiment of the present invention is improved, it is described first activestandby state value is negated after value and the
Two activestandby state values are done and computing, including：When determining the first activestandby state value and unequal the second activestandby state value, by the
One activestandby state value negate after value and the second activestandby state value is done and computing；Determining the first activestandby state value and second
When activestandby state value is equal, then malfunction.
Further as an embodiment of the present invention is improved, a main power board of correspondence in the binary number 1 and 0
State, another corresponds to standby exchange board status, including：The binary number 1 corresponds to main exchange board status, and binary number 0 corresponds to
It is standby to exchange board status；It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；
When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board, including：Determining the 3rd master
When standby state value is equal to 0, main power board is the first power board；When definite 3rd activestandby state value is equal to 1, main power board is the
Two power boards.
Further as an embodiment of the present invention is improved, a main power board of correspondence in the binary number 1 and 0
State, another corresponds to standby exchange board status, including：The binary number 0 corresponds to main exchange board status, and binary number 1 corresponds to
It is standby to exchange board status；It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；
When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board, including：Determining the 3rd master
When standby state value is equal to 1, main power board is the first power board；When definite 3rd activestandby state value is equal to 0, main power board is the
Two power boards.
Further as an embodiment of the present invention is improved, and the method for the main power board of selection further includes following step
Suddenly：Interface board is connected to main power board by control data channel switching switch.
An embodiment of the present invention additionally provides a kind of device for selecting main power board, including with lower module：
Acquisition module, for obtaining the first activestandby state value of the first power board and the second activestandby state value of the second power board,
The first activestandby state value and the second activestandby state value value range are all binary number 1 and 0, in the binary number 1 and 0
A main exchange board status of correspondence, another, which is corresponded to, standby exchanges board status；
Computing module, for the value after the first activestandby state value is negated and the second activestandby state value is done and computing, obtains
Three activestandby state values；
Judgment module, for when definite 3rd activestandby state value corresponds to standby exchange board status, main power board to be the first power board；
When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board.
An embodiment of the present invention provides a kind of device for selecting main power board, including with lower module：For inputting the
The first input end of first activestandby state value of one power board, for inputting the second defeated of the first the second activestandby state value exchanged
Enter end, the signal output part for exporting signal, inversed module and and computing module；The first input end is connected to anti-phase mould
The input terminal of block, the output terminal of the inversed module are connected to an input terminal with computing module, and second input terminal connects
It is connected to another input terminal with computing module；It is described to be connected to signal output part with computing module output terminal.
Further as an embodiment of the present invention is improved, and the device of the main power board of selection is further included with lower die
Block：The data channel switching switch of signal output part is connected to, the data channel switching switch is in the definite signal output
When the exported signal in end corresponds to standby exchange board status, interface board is connected to the first power board；The data channel switching is opened
Close when the signal for determining that the signal output part is exported corresponds to main exchange board status, interface board is connected to the second exchange
Plate.
Further as an embodiment of the present invention is improved, and the inversed module is NOT gate.
Further as an embodiment of the present invention is improved, and the inversed module is NPN transistor.
Relative to the prior art, the technical effects of the invention are that：The side of the main power board of selection in the embodiment of the present invention
Method can not only select main power board from two power boards, and in the method, it is thus only necessary to two binary numbers
Carry out the operation of " negating " and "AND", it is seen then that the time it takes is short, efficient, can effectively reduce interchanger and stop work
The time of work.
Brief description of the drawings
Fig. 1 is the flow diagram of the method for the main power board of selection in the embodiment of the present invention one；
Fig. 2 is the structure diagram of the device of the main power board of selection in the embodiment of the present invention two；
Fig. 3 is the first structure schematic diagram of the device of the main power board of selection in the embodiment of the present invention three；
Fig. 4 is the second structure diagram of the device of the main power board of selection in the embodiment of the present invention three.
Embodiment
Below with reference to each embodiment shown in the drawings, the present invention will be described in detail.But these embodiments are not
The limitation present invention, structure that those of ordinary skill in the art are made according to these embodiments, method or change functionally
Change and be all contained in protection scope of the present invention.
The embodiment of the present invention one provides a kind of method for selecting main power board, as shown in Figure 1, comprising the following steps：
Step 101：Obtain the first activestandby state value of the first power board and the second activestandby state value of the second power board, described
One activestandby state value and the second activestandby state value value range are all binary number 1 and 0, one in the binary number 1 and 0
Corresponding main exchange board status, another corresponds to standby exchange board status；Here, activestandby state value value range for binary number 1 or
0, it is fairly simple, and the space of a bit is only needed to store, memory space can be saved.When some power board is in main friendship
When changing board status, which is main power board at this time；When some power board is in standby exchange board status, the power board is at this time
For standby power board.
Step 102：Value after first activestandby state value is negated and the second activestandby state value is done and computing, obtains the 3rd
Activestandby state value；
Step 103：When definite 3rd activestandby state value corresponds to standby exchange board status, main power board is the first power board；True
When fixed 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board.
Here, step 101- steps 103 can be realized with a program in a switch, a hardware electricity can also be used
Road is realized；It is appreciated that the processing speed of hardware circuit using hardware circuit than comparatively fast, therefore, preferentially being realized.
In a step 102, it is thus only necessary to two binary numbers are carried out with the operation of " negating " and "AND", it is seen then that spent
Time it is short, efficient, can effectively reduce the time that interchanger is stopped.
Preferably, it is described first activestandby state value is negated after value and the second activestandby state value is done and computing, including：
When determining the first activestandby state value and unequal the second activestandby state value, value after the first activestandby state value is negated with
Second activestandby state value is done and computing；When determining the first activestandby state value and equal the second activestandby state value, then malfunction.
After the main power board of original concedes major state to former standby power board, former standby power board is just used as new main power board,
And former main power board is used as newly standby power board, it is seen then that one in first, second power board is new main power board, another must
It is so new standby power board, therefore, the first activestandby state value and the second activestandby state value are necessarily different values；And if identical,
Then occurs mistake certainly.Optionally, after error, may remind the user that interchanger, there occurs failure.
Here, activestandby state value value range is binary number 1 and 0, and 1 and 0 represents different states, Ke Yifen respectively
For two kinds of situations：（1）Binary number 1 represents main exchange board status（Binary number 1 corresponds to main exchange board status）, binary number 0
Represent standby and exchange board status（Binary number 0 corresponds to standby exchange board status）；（2）Binary number 1 represents standby and exchanges board status（Two into
Number 1 processed corresponds to standby exchange board status）, binary number 0 represents main exchange board status（Binary number 0 corresponds to main exchange board status）.
Preferably, a main exchange board status of correspondence in the binary number 1 and 0, another corresponds to standby exchange tabular
State, including：The binary number 1 corresponds to main exchange board status, and binary number 0 corresponds to standby exchange board status；
It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；Determining the
When three activestandby state values correspond to main exchange board status, main power board is the second power board, including：In definite 3rd activestandby state value
During equal to 0, main power board is the first power board；When definite 3rd activestandby state value is equal to 1, main power board exchanges for second
Plate.
Here, binary number 1 corresponds to main exchange board status, and binary number 0 corresponds to standby exchange board status, then this is that have to be divided to two
Kind situation：
（1）When the first activestandby state value of the first power board is 1（That is the first power board is main power board）, the of the second power board
Two activestandby state values are 0（That is the second power board is standby power board）, then in a step 102, the first activestandby state value 1 negate 0,
Asked with the second activestandby state value 0 with obtaining 0, because 0 corresponds to standby exchange board status, then understand, in step 103, judge to lead
Power board is the first power board；
（2）When the first activestandby state value of the first power board is 0（That is the first power board is standby power board）, the of the second power board
Two activestandby state values are 1（That is the second power board is main power board）, then in a step 102, the first activestandby state value 0 negate 1,
Asked with the second activestandby state value 1 with obtaining 1, because 1 corresponds to main exchange board status, then understand, in step 103, judge to lead
Power board is the second power board.
Preferably, a main exchange board status of correspondence in the binary number 1 and 0, another corresponds to standby exchange tabular
State, including：The binary number 0 corresponds to main exchange board status, and binary number 1 corresponds to standby exchange board status；
It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；Determining the
When three activestandby state values correspond to main exchange board status, main power board is the second power board, including：In definite 3rd activestandby state value
During equal to 1, main power board is the first power board；When definite 3rd activestandby state value is equal to 0, main power board exchanges for second
Plate.
Here, binary number 0 corresponds to main exchange board status, and binary number 1 corresponds to standby exchange board status, then this is that have to be divided to two
Kind situation：
（1）When the first activestandby state value of the first power board is 0（That is the first power board is main power board）, the of the second power board
Two activestandby state values are 1（That is the second power board is standby power board）, then in a step 102, the first activestandby state value 0 negate 1,
Asked with the second activestandby state value 1 with obtaining 1, because 1 corresponds to standby exchange board status, then understand, in step 103, judge to lead
Power board is the first power board；
（2）When the first activestandby state value of the first power board is 1（That is the first power board is standby power board）, the of the second power board
Two activestandby state values are 0（That is the second power board is main power board）, then in a step 102, the first activestandby state value 1 negate 0,
Asked with the second activestandby state value 0 with obtaining 0, because 0 corresponds to main exchange board status, then understand, in step 103, judge to lead
Power board is the second power board.
Preferably, the method for the main power board of selection is further comprising the steps of：Control data channel switching switch will connect
Oralia is connected to main power board.In step 101- steps 103, main power board is selected from first, second power board,
Then need interface board being connected on main power board data channel switching switch, so that interchanger can continue offer service.
Here it is possible to the groove position residing for the identification code of main power board or main power board is sent to data channel switching switch, so that number
Interface board can be connected to main power board up according to passage switching switch.
The embodiment of the present invention additionally provides a kind of device for selecting main power board, including with lower module：
Acquisition module, for obtaining the first activestandby state value of the first power board and the second activestandby state value of the second power board,
The first activestandby state value and the second activestandby state value value range are all binary number 1 and 0, in the binary number 1 and 0
A main exchange board status of correspondence, another, which is corresponded to, standby exchanges board status；
Computing module, for the value after the first activestandby state value is negated and the second activestandby state value is done and computing, obtains
Three activestandby state values；
Judgment module, for when definite 3rd activestandby state value corresponds to standby exchange board status, main power board to be the first power board；
When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board.
The embodiment of the present invention two provides a kind of device for selecting main power board, as shown in Fig. 2, including with lower module：
First input end 11 for the first activestandby state value of the first power board of input, second for the second power board of input
Second input terminal of activestandby state value 12, the signal output part 13 for exporting signal, inversed module 1 and with computing module 2；
The first input end 11 is connected to the input terminal of inversed module 1, and the output terminal of the inversed module 1 is connected to and computing
One input terminal of module 2, second input terminal 12 are connected to another input terminal with computing module 2；Described and computing mould
The output terminal of block 2 is connected to signal output part 13.
Here, the function of inversed module 1 be by the signal inputted from first input end 11 carry out complementary operation, i.e., if
Input signal is high level, then exports low level；And if input signal is low level, export high level.With computing module 3
Function be two signals of input to be asked and computing, i.e., high level is just exported when only two level are high level,
Otherwise low level is exported.Inversed module 1 can include NOT gate, NPN（Negative Positive Negative）Transistor etc.；
Can be with door, gate logic etc. with computing module 2.
When in use, the first activestandby state value is inputted from first input end 11, it is active and standby from the input second of first input end 12
Which power board state value, judge for main power board, i.e., in the output signal in the output signal according to signal output part 13
During corresponding standby exchange board status, main power board is the first power board；When output signal corresponds to main exchange board status, main power board
For the second power board.
The device of the main power board of selection in the embodiment of the present invention is the one of the method for the main power board of selection of embodiment one
Kind of hardware implementation mode, it is to be understood that hardware unit have it is fireballing a little, can quickly perform in embodiment one
Method, so as to be significantly reduced the time that interchanger is stopped.
Preferably, further include with lower module：It is connected to the data channel switching switch 3 of signal output part 12, the data
Passage switching switch 3 connects interface board when the signal for determining that affiliated signal output part 13 is exported corresponds to standby exchange board status
It is connected to the first power board；The data channel switching switch 3 is in the signal correspondence master for determining that affiliated signal output part 13 is exported
When exchanging board status, interface board is connected to the second power board.The first power board and the second power board are not shown in fig. 2,
It is understood that the first power board requires connect to first input end 11, the second power board requires connect to the second input terminal
12；And data channel switching switch can connect the first power board, the second power board and interface board, so that data channel switching is opened
The first power board or the second power board can be connected to by inner cut-out circuit by interface board by closing 3.
Optionally, the inversed module 1 is NOT gate.
Optionally, the inversed module 1 is NPN transistor.
The embodiment of the present invention three provides the device for selecting main power board, as shown in Fig. 2, including with lower module：For defeated
Enter the first input end 11 of the first activestandby state value of the first power board, the second activestandby state value for inputting the second power board
12 the second input terminal, the signal output part 13 for exporting signal, inversed module 1 and with computing module 2；First input
End 11 is connected to the input terminal of inversed module 1, and the output terminal of the inversed module 1 is connected to an input with computing module 2
End, second input terminal 12 are connected to another input terminal with computing module 2；The output terminal with computing module 2 is connected
To signal output part 13.
As shown in figure 3, inversed module 1 is a NPN transistor, the emitter ground connection of the NPN transistor, collector passes through
Resistance R1 is connected to power supply and is connected to an input terminal with computing module 2；It is with computing module 2 and arithmetic unit.At this
In device, first, second power board can send the level for being used for characterizing its working status by first, second input terminal respectively,
Low level represents " main exchange board status ", and high level represents " standby to exchange board status " state.When the input of first input end 11 is height
During level, the emitter and collector of NPN transistor turns on, then collector output low level；And when first input end 11 inputs
For level when, the emitter and collector of NPN transistor is not turned on, then collector output high level；So as to the NPN transistor
Just complete the function of a phase inverter.
As shown in figure 4, the inversed module 1 is a NOT gate, it is with computing module 2 and arithmetic unit.In the apparatus,
First, the second power board can send the level for being used for characterizing its working status by first, second input terminal respectively, and low level represents
" main exchange board status ", high level represent " from board status is exchanged " state.
It should be appreciated that although the present specification is described in terms of embodiments, not each embodiment only includes one
A independent technical solution, this narrating mode of specification is only that those skilled in the art will should say for clarity
For bright book as an entirety, the technical solution in each embodiment may also be suitably combined to form those skilled in the art can
With the other embodiment of understanding.
Those listed above is a series of to be described in detail only for feasibility embodiment of the invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should all be included in the protection scope of the present invention.
Claims (10)
- A kind of 1. method for selecting main power board, it is characterised in that comprise the following steps：Obtain the first activestandby state value of the first power board and the second activestandby state value of the second power board, the first active and standby shape State value and the second activestandby state value value range are all binary number 1 and 0, a main friendship of correspondence in the binary number 1 and 0 Board status is changed, another corresponds to standby exchange board status；Value after first activestandby state value is negated and the second activestandby state value is done and computing, obtains the 3rd activestandby state value；When definite 3rd activestandby state value corresponds to standby exchange board status, main power board is the first power board；Determining the 3rd master When standby state value corresponds to main exchange board status, main power board is the second power board.
- 2. the method for the main power board of selection according to claim 1, it is characterised in thatIt is described first activestandby state value is negated after value and the second activestandby state value is done and computing, including：Determining the When one activestandby state value and unequal the second activestandby state value, value and the second active and standby shape after the first activestandby state value is negated State value is done and computing；When determining the first activestandby state value and equal the second activestandby state value, then malfunction.
- 3. the method for the main power board of selection according to claim 1, it is characterised in thatA main exchange board status of correspondence in the binary number 1 and 0, another corresponds to standby exchange board status, including：It is described Binary number 1 corresponds to main exchange board status, and binary number 0 corresponds to standby exchange board status；It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；Determining the When three activestandby state values correspond to main exchange board status, main power board is the second power board, including：In definite 3rd activestandby state value During equal to 0, main power board is the first power board；When definite 3rd activestandby state value is equal to 1, main power board exchanges for second Plate.
- 4. the method for the main power board of selection according to claim 1, it is characterised in thatA main exchange board status of correspondence in the binary number 1 and 0, another corresponds to standby exchange board status, including：It is described Binary number 0 corresponds to main exchange board status, and binary number 1 corresponds to standby exchange board status；It is described definite 3rd activestandby state value correspond to it is standby exchange board status when, main power board is the first power board；Determining the When three activestandby state values correspond to main exchange board status, main power board is the second power board, including：In definite 3rd activestandby state value During equal to 1, main power board is the first power board；When definite 3rd activestandby state value is equal to 0, main power board exchanges for second Plate.
- 5. the method for the main power board of selection according to claim 1, it is characterised in that further comprising the steps of：Control Interface board is connected to main power board by data channel switching switch.
- 6. a kind of device for selecting main power board, it is characterised in that including with lower module：Acquisition module, for obtaining the first activestandby state value of the first power board and the second activestandby state value of the second power board, The first activestandby state value and the second activestandby state value value range are all binary number 1 and 0, in the binary number 1 and 0 A main exchange board status of correspondence, another, which is corresponded to, standby exchanges board status；Computing module, for the value after the first activestandby state value is negated and the second activestandby state value is done and computing, obtains Three activestandby state values；Judgment module, for when definite 3rd activestandby state value corresponds to standby exchange board status, main power board to be the first power board； When definite 3rd activestandby state value corresponds to main exchange board status, main power board is the second power board.
- 7. a kind of device for selecting main power board, it is characterised in that including with lower module：First input end for the first activestandby state value for inputting the first power board, for input first exchange it is second active and standby Second input terminal of state value, the signal output part for exporting signal, inversed module and and computing module；The first input end is connected to the input terminal of inversed module, and the output terminal of the inversed module is connected to and computing module An input terminal, second input terminal is connected to another input terminal with computing module；The described and output of computing module End is connected to signal output part.
- 8. the device of the main power board of selection according to claim 7, it is characterised in that：Further include with lower module：The data channel switching switch of signal output part is connected to, the data channel switching switch is in the definite signal output When the exported signal in end corresponds to standby exchange board status, interface board is connected to the first power board；The data channel switching is opened Close when the signal for determining that the signal output part is exported corresponds to main exchange board status, interface board is connected to the second exchange Plate.
- 9. the device of the main power board of selection according to claim 7, it is characterised in that：The inversed module is NOT gate.
- 10. the device of the main power board of selection according to claim 7, it is characterised in that：The inversed module is NPN crystal Pipe.
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| CN (1) | CN107948106A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108600565A (en) * | 2018-04-24 | 2018-09-28 | 深圳震有科技股份有限公司 | More PBX share network system, method and the interchanger of SS7 signalling points |
| CN111740927A (en) * | 2020-07-20 | 2020-10-02 | 湖南航天捷诚电子装备有限责任公司 | Redundant switch |
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| US20120112561A1 (en) * | 2009-06-24 | 2012-05-10 | Zte Corporation | Method and system for switching main/standby boards |
| CN206117845U (en) * | 2016-08-31 | 2017-04-19 | 广州瀚昇智能科技有限公司 | Spare signal automatic switch -over circuit of video |
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| CN2383274Y (en) * | 1999-08-24 | 2000-06-14 | 深圳市中兴通讯股份有限公司 | Main spare plate switching device for electronic communication system |
| CN1494228A (en) * | 2002-11-02 | 2004-05-05 | 华为技术有限公司 | Method of realizing single plate main and ready change over and its circuit |
| CN1553622A (en) * | 2003-06-04 | 2004-12-08 | 中兴通讯股份有限公司 | Method and device for realizing main backup of clock in synchronizing system |
| CN2687949Y (en) * | 2003-10-22 | 2005-03-23 | 中国科学院长春光学精密机械与物理研究所 | Automatic switching control device for pulse signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108600565A (en) * | 2018-04-24 | 2018-09-28 | 深圳震有科技股份有限公司 | More PBX share network system, method and the interchanger of SS7 signalling points |
| CN111740927A (en) * | 2020-07-20 | 2020-10-02 | 湖南航天捷诚电子装备有限责任公司 | Redundant switch |
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Application publication date: 20180420 |