CN103346873B - A kind of method and apparatus of time synchronized - Google Patents

A kind of method and apparatus of time synchronized Download PDF

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Publication number
CN103346873B
CN103346873B CN201310260860.4A CN201310260860A CN103346873B CN 103346873 B CN103346873 B CN 103346873B CN 201310260860 A CN201310260860 A CN 201310260860A CN 103346873 B CN103346873 B CN 103346873B
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signal
time
level
pps
moment
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CN103346873A (en
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侯思剑
傅健新
葛湘
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The embodiment of the present invention provides the method and apparatus of a kind of time synchronized, relates to the communications field, realizes cost and complexity with reduce interaction time signal between master clock plate and standby clock board.The method includes: the first clock board obtains pulse per second (PPS) PPS signal and corresponding temporal information TOD signal, and the TOD information in this PPS signal and this TOD signal is sent to second clock plate by time synchronizing signal, so that this second clock buttress carries out time synchronized according to this time synchronizing signal, wherein, this time synchronizing signal includes this PPS signal and this TOD information.The embodiment of the present invention is used for time synchronized.

Description

A kind of method and apparatus of time synchronized
Technical field
The present invention relates to the communications field, the method and apparatus particularly relating to a kind of time synchronized.
Background technology
Synchronization Network system needs the time synchronized between each network equipment.The one of time synchronized Important channel is to follow the tracks of timing node by the network equipment to realize, and the network equipment typically has two pieces mutually The clock board backed up mutually: master clock plate and standby clock board, time signal need to be input simultaneously to main, On standby clock board interface.
In prior art, in order to realize the synchronization of active and standby clock board temporal information, time signal Need to be delivered simultaneously on active and standby clock board, but, the network equipment is to every road time signal only There is an interface, it is impossible to meet simultaneously and flow to master clock plate and the requirement of standby clock board, when this When interface is connected on standby clock board, need by two holding wires realize active and standby clock board it Between time signal mutual, the time signal form of a kind of main flow is: 1PPS (Pulse Per Second, pulse per second (PPS))+TOD (Time Of Date, temporal information) form, during Ji Mei road Between signal (i.e. transmit the holding wire of PPS signal and transmission TOD signal by two holding wires Holding wire) complete the time signal of 1PPS+TOD form between master clock plate and standby clock board Transmission, but, owing to the interface between master clock plate and standby clock board is limited, when transmission is more During time signal, need to increase more interface and connecting line, add the cost of realization with multiple Miscellaneous degree.
Summary of the invention
Embodiments of the invention provide the method and apparatus of a kind of time synchronized, to reduce master clock plate And between standby clock board interaction time signal realize cost and complexity.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that
First aspect, it is provided that a kind of method of time synchronized, including:
First clock board obtains pulse per second (PPS) PPS signal and corresponding temporal information TOD signal；
TOD information in described PPS signal and described TOD signal is sent out by time synchronizing signal Deliver to second clock plate, in order to described second clock buttress carries out the time according to described time synchronizing signal Synchronizing, wherein, described time synchronizing signal includes described PPS signal and described TOD information.
In the first possible implementation of first aspect, when described first clock board is master clock During plate, described first clock board obtains PPS signal and TOD signal includes:
Described first clock board generates PPS signal and TOD signal；
When described first clock board is standby clock board, described first clock board obtain PPS signal and TOD signal includes: described first clock board receives PPS signal and the TOD letter that timing node sends Number.
In conjunction with the first possible implementation of first aspect, in the implementation that the second is possible In, when described first clock board is master clock plate, described by described PPS signal with described TOD TOD information in signal is sent to second clock plate by time synchronizing signal, and described method is also Including:
Determine the rising edge of described PPS signal arrive moment and described PPS signal high level time Between length, and determine the described TOD information of transmission according to the rising edge of described PPS signal moment that arrives Initial time；
Rising edge arrival moment, the first predetermined time period and second according to described PPS signal are pre- If time span generates the first data select signal；
Wherein, described first data select signal passes through at the first clock board described in the first level indicating Described time synchronizing signal sends described TOD information to described second clock plate, refers at second electrical level Show that described first clock board sends described by described time synchronizing signal to described second clock plate PPS signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described first predetermined time period less than described PPS signal high level time span and Less than the rising edge of described PPS signal arrive the moment with send described TOD information initial time it Between time span；When described second predetermined time period initiates more than the transmission of described TOD information Carve the time span between the moment being sent completely described TOD information.
In conjunction with the first possible implementation of first aspect, in the implementation that the third is possible In, when described first clock board is standby clock board, described by described PPS signal with described TOD TOD information in signal is sent to second clock plate by time synchronizing signal, and described method is also Including:
The rising edge arrival moment of described PPS signal and described PPS is obtained according to described PPS signal Signal is in the time span of high level, and determines according to the rising edge arrival moment of described PPS signal Send the initial time of described TOD information；
Determining that the first predetermined time period is less than the described PPS signal time span at high level And arrive moment and the initial time of the described TOD information of transmission less than the rising edge of described PPS signal Between time span time, according to described rising edge arrive moment, described first predetermined time period The first data select signal is generated with the second predetermined time period；
Wherein, described first data select signal passes through at the first clock board described in the first level indicating Described time synchronizing signal sends described TOD information to described second clock plate, refers at second electrical level Show that described first clock board sends described by described time synchronizing signal to described second clock plate PPS signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described second predetermined time period extremely sends more than the transmission initial time of described TOD information Complete the time span between the moment of described TOD information.
The implementation possible in conjunction with the second or the third possible implementation, can at the 4th kind Can implementation in, described TOD information in described PPS signal and described TOD signal is led to Cross time synchronizing signal to send to second clock plate, including:
When determining that described first data select signal is second electrical level, when presetting according to described first Between length send described PPS signal；
When determining that described first data select signal is the first level, when presetting according to described second Between length send described TOD information.
Second aspect, it is provided that a kind of method of time synchronized, it is characterised in that including:
Second clock plate receives the time synchronizing signal that the first clock board sends, wherein, described time Synchronizing signal includes PPS signal and TOD information；
Described PPS signal and described TOD information is obtained according to described time synchronizing signal；
Time synchronized is carried out according to described PPS signal and described TOD information.
In the first possible implementation of second aspect, believe according to described time synchronized described Before number obtaining described PPS signal and described TOD information, also include:
Determine that the rising edge of described time synchronizing signal arrives the moment；
Rising edge according to described time synchronizing signal arrives moment, the first predetermined time period and the Two predetermined time period generate the second data select signal；
Wherein, described second data select signal passes through at second clock plate described in the first level indicating Described time synchronizing signal obtains described TOD information, indicates described second clock plate at second electrical level Described PPS signal is obtained by described time synchronizing signal；Described first level includes high level, Described second electrical level includes low level；Or, described first level includes low level, described second Level includes high level；
Described first predetermined time period includes that the rising edge of described time synchronizing signal arrives the moment The time span between switching instant is initiateed to the level of described second data select signal, described the Two predetermined time period include that the level of described second data select signal initiates the moment of switching extremely Time span between the level switching instant again of described second data select signal.
In conjunction with the implementation that the first is possible, in the implementation that the second is possible, described Described PPS signal and described TOD information is obtained according to described time synchronizing signal, including:
When determining that described second data select signal is second electrical level, believed by described time synchronized Number obtain described PPS signal；
When determining that described second data select signal is the first level, believed by described time synchronized Number obtain described TOD information.
The third aspect, it is provided that a kind of clock board, including:
Acquiring unit, for obtaining PPS signal and corresponding TOD signal；
Transmitting element, for the described PPS signal obtained by described acquiring unit and described TOD letter TOD information in number is sent to second clock plate by time synchronizing signal, in order to when described second Clock buttress carries out time synchronized, wherein, described time synchronizing signal bag according to described time synchronizing signal Include described PPS signal and described TOD information.
In the first possible implementation of the third aspect, when described clock board is master clock plate Time, described acquiring unit specifically for, generate PPS signal and TOD signal；
When described clock board is standby clock board, described acquiring unit is specifically for, segmentum intercalaris during reception The PPS signal of some transmission and TOD signal.
In conjunction with the implementation that the first is possible, in the implementation that the second is possible, when described When clock board is master clock plate, described clock board also includes:
Processing unit, for determining rising edge arrival moment and the described PPS letter of described PPS signal Number in the time span of high level, and determine send out according to the rising edge of described PPS signal moment that arrives Send the initial time of described TOD information；
First signal signal generating unit, for the described PPS signal that determines according to described processing unit Rising edge arrival moment, the first predetermined time period and the second predetermined time period generate the first data Select signal；
Wherein, described first data select signal passes through at the first clock board described in the first level indicating Described time synchronizing signal sends described TOD information to described second clock plate, refers at second electrical level Show that described first clock board sends described by described time synchronizing signal to described second clock plate PPS signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described first predetermined time period less than described PPS signal high level time span and Less than the rising edge of described PPS signal arrive the moment with send described TOD information initial time it Between time span；When described second predetermined time period initiates more than the transmission of described TOD information Carve the time span between the moment being sent completely described TOD information.
In conjunction with the implementation that the first is possible, in the implementation that the third is possible, when described When clock board is standby clock board, described clock board also includes:
Detector unit, arrives for obtaining the rising edge of described PPS signal according to described PPS signal Moment and described PPS signal are in the time span of high level, and according to the rising of described PPS signal Along arriving, the moment determines the initial time sending described TOD information, and determines that the first Preset Time is long Degree is less than the described PPS signal time span at high level and the rising edge less than described PPS signal Arrive the time span between moment and the initial time sending described TOD information；
In described detector unit, secondary signal signal generating unit, for determining that the first predetermined time period is little In described PPS signal the time span of high level and less than described PPS signal rising edge arrive During time span between moment and the initial time sending described TOD information, according to described rising Along arriving, moment, described first predetermined time period and the second predetermined time period generate the first data Select signal；
Wherein, described first data select signal passes through at the first clock board described in the first level indicating Described time synchronizing signal sends described TOD information to described second clock plate, refers at second electrical level Show that described first clock board sends described by described time synchronizing signal to described second clock plate PPS signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described second predetermined time period extremely sends more than the transmission initial time of described TOD information Complete the time span between the moment of described TOD information.
The implementation possible in conjunction with the second or the third possible implementation, can at the 4th kind Can implementation in, described transmitting element specifically for, determining described first data select letter When number being low level, send described PPS signal according to described first predetermined time period；
When determining that described first data select signal is high level, according to described second Preset Time Length sends described TOD information.
Fourth aspect, it is provided that a kind of clock board, including:
Acquiring unit, for receiving the time synchronizing signal that the first clock board sends, wherein, described Time synchronizing signal includes PPS signal and TOD information；
Processing unit, the time synchronizing signal obtained according to described acquiring unit obtains described PPS letter Number and described TOD information；
Lock unit, for the described PPS signal obtained according to described processing unit and described TOD Information carries out time synchronized.
In the first possible implementation of fourth aspect, described clock board also includes:
Detector unit, for determining that the rising edge of described time synchronizing signal arrives the moment；
First signal signal generating unit, for the time synchronizing signal that determines according to described detector unit Rising edge arrival moment, the first predetermined time period and the second predetermined time period generate the second data Select signal；
Wherein, described second data select signal passes through at second clock plate described in the first level indicating Described time synchronizing signal obtains described TOD information, indicates described second clock plate at second electrical level Described PPS signal is obtained by described time synchronizing signal；Described first level includes high level, Described second electrical level includes low level；Or, described first level includes low level, described second Level includes high level；
Described first predetermined time period includes that the rising edge of described time synchronizing signal arrives the moment The time span between switching instant is initiateed to the level of described second data select signal, described the Two predetermined time period include that the level of described second data select signal initiates the moment of switching extremely Time span between the level switching instant again of described second data select signal.
In conjunction with the implementation that the first is possible, in the time mode that the second is possible, described place Reason unit specifically for, when determining that described second data select signal is second electrical level, by institute State time synchronizing signal and obtain described PPS signal；
When determining that described second data select signal is the first level, believed by described time synchronized Number obtain described TOD information.
5th aspect, the embodiment of the present invention provides a kind of network equipment, including above-mentioned third aspect institute Clock board described in the clock board stated and fourth aspect.
By using such scheme, the first clock board obtains PPS signal and corresponding TOD signal, And the TOD information in described PPS signal and described TOD signal is sent by time synchronizing signal To second clock plate, in order to it is same that described second clock buttress carries out the time according to described time synchronizing signal Step, so, owing to PPS signal and corresponding TOD signal are by a letter by the first clock board Number (i.e. time synchronizing signal) sends to second clock plate, thus decreases active and standby clock board Between the interface of interaction time signal and connecting line, reduce and hand between master clock plate and standby clock board Mutually time signal realize cost and complexity.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below The accompanying drawing used required in embodiment or description of the prior art will be briefly described, aobvious and Easily insight, the accompanying drawing in describing below is only some embodiments of the present invention, for this area From the point of view of those of ordinary skill, on the premise of not paying creative work, it is also possible to according to these Accompanying drawing obtains other accompanying drawing.
The schematic diagram of a kind of method for synchronizing time that Fig. 1 provides for the embodiment of the present invention；
A kind of data select signal that Fig. 2 provides for the embodiment of the present invention and time synchronizing signal Reference view；
The schematic diagram of the another kind of method for synchronizing time that Fig. 3 provides for the embodiment of the present invention；
The schematic flow sheet of a kind of method for synchronizing time that Fig. 4 provides for the embodiment of the present invention；
The schematic flow sheet of the another kind of method for synchronizing time that Fig. 5 provides for the embodiment of the present invention；
The structural representation of a kind of clock board that Fig. 6 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Fig. 7 a provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Fig. 7 b provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Fig. 8 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Fig. 9 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 10 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 11 a provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 11 b provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 12 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 13 a provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 13 b provides for the embodiment of the present invention；
The structural representation of a kind of network equipment that Figure 14 provides for the embodiment of the present invention；
The structural representation of the another kind of network equipment that Figure 15 a provides for the embodiment of the present invention；
The structural representation of the another kind of network equipment that Figure 15 b provides for the embodiment of the present invention；
The structural representation of a kind of clock board that Figure 16 provides for the embodiment of the present invention；
The structural representation of the another kind of clock board that Figure 17 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention It is clearly and completely described, it is clear that described embodiment is only that a part of the present invention is real Execute example rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into this The scope of invention protection.
The embodiment of the present invention provides a kind of method of time synchronized, as it is shown in figure 1, the present invention implements Example is applied to a kind of network equipment, and this network device includes the first clock board and second clock plate, should The executive agent of method is the first clock board, and the method includes:
S101, the first clock board obtain PPS signal and the TOD signal of correspondence.
Wherein, this PPS signal is low level at one's leisure, and this TOD signal is high electricity at one's leisure Flat.
Specifically, the network equipment obtains PPS signal and corresponding TOD signal includes following two side Formula:
Mode one, the network equipment self generates PPS signal and corresponding TOD signal, and should PPS signal and corresponding TOD signal send to downstream network device, in order to downstream network device with This network equipment realizes time synchronized.
Now, the first clock board in the network equipment is master clock plate, above-mentioned PPS signal and correspondence TOD signal generated by this master clock plate, the most above-mentioned first clock board obtains PPS signal and correspondence TOD signal be: this first clock board generates PPS signal and TOD signal.
Mode two, the network equipment receives PPS signal and the corresponding TOD signal that timing node sends, Thus realize the time synchronized between timing node
Now, the first clock board in the network equipment is standby clock board, and the most above-mentioned first clock board obtains Obtain PPS signal and corresponding TOD signal is: this first clock board receives what timing node sent PPS signal and TOD signal, wherein, this timing node can be BITS (Building Integrated Timing System, Building Integrated Timing Supply) or upstream network device.
When TOD information in this PPS signal and this TOD signal is passed through by S102, the first clock board Between synchronizing signal send to second clock plate, in order to this second clock buttress is according to this time synchronizing signal Carry out time synchronized.
Wherein, this time synchronizing signal includes this PPS signal and this TOD information.
It should be noted that this time synchronizing signal carves holding low level at one's leisure, due to PPS Signal is low level at one's leisure, and therefore, the rising edge arrival moment of this time synchronizing signal is The rising edge of this PPS signal arrives the moment, and this time synchronizing signal is after rising edge arrives, always Maintain high level, until after having sent this TOD information, this time synchronizing signal switches back into low level.
It addition, in embodiments of the present invention, this TOD information can be passed through on time synchronizing signal Data segment signal is transmitted, and this data segment signal is used for transmitting TOD information in TOD signal, This data segment signal is high level at one's leisure.
Further, the first clock board is by the TOD information in this PPS signal and this TOD signal Sent to second clock plate by time synchronizing signal, it is also possible to include following two realization side Formula:
Mode one: (this first clock board generates PPS when this first clock board is master clock plate Signal and TOD information, corresponding second clock plate is standby clock board), the first clock board determines The rising edge of this PPS signal arrives moment and this PPS signal time span at high level, and root The initial time sending this TOD information, and root is determined according to the rising edge arrival moment of this PPS signal Rising edge arrival moment, the first predetermined time period and the second Preset Time according to this PPS signal are long Degree generates the first data select signal.
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate.This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level.
This first predetermined time period and is less than in the time span of high level less than this PPS signal The rising edge of this PPS signal arrives the time between moment and the initial time sending this TOD information Length, this second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
It should be noted that the rising edge that this first preset length is this PPS signal arrives, the moment is extremely The level of this first data select signal initiates the time span between switching instant, this second preset The level of this first data select signal a length of initiates switching instant and selects letter to these first data Number level switching instant again between time span.
Wherein, level initiates switching instant to be that data select signal is switched to by high level low level Moment (i.e. the trailing edge of this data select signal arrives the moment), then corresponding level switches again Moment is that data select signal is switched to the moment of high level (i.e. this data select signal by low level Rising edge arrive the moment)；Or, it is that data select signal is by low electricity that level initiates switching instant Truncation shifts to the moment (i.e. the rising edge of this data select signal arrives the moment) of high level, the most right The level answered switching instant again is that data select signal is switched to the low level moment by high level (i.e. the trailing edge of this data select signal arrives the moment).
Mode two: (this first clock board receives the time when this first clock board is standby clock board The PPS signal of node transmission and TOD information, corresponding second clock plate is master clock plate), First clock board obtains rising edge arrival moment and this PPS of this PPS signal according to this PPS signal Signal is in the time span of high level, and determines send out according to the rising edge of this PPS signal moment that arrives Give the initial time of this TOD information, and determining that the first predetermined time period is less than this PPS signal Time span at high level and the rising edge less than this PPS signal arrive the moment and send this TOD During time span between the initial time of information, when the first clock board arrives according to this rising edge Quarter, this first predetermined time period and the second predetermined time period generate the first data select signal.
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate；This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level；
This second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
It should be noted that above-mentioned first predetermined time period is less than this PPS signal at high level Time span and arrive the moment less than the rising edge of this PPS signal and send the initial of this TOD information Time span between moment is to prevent from sending PPS signal (the i.e. first data select signal For second electrical level) time, in the first predetermined time period, the data segment comprising TOD information detected The trailing edge of signal, such as, if the first predetermined time period arrives more than the rising edge of this PPS signal Carry out the time span between moment and the initial time sending this TOD information, then comprise TOD letter When the trailing edge (i.e. sending the initial time of this TOD information) of the data segment signal of breath arrives, should First data select signal does not switches to the first level from second electrical level, say, that, although should The delivery time of TOD information has arrived, but this TOD information does not send, thus causes PSS The confusion that signal and TOD information send.Therefore, this first predetermined time period should be less than being somebody's turn to do The PPS signal time span at high level and the rising edge less than this PPS signal arrive the moment and send out Give the time span between the initial time of this TOD information.
Above-mentioned second predetermined time period is more than the transmission initial time of this TOD information to having sent Becoming the time span between the moment of this TOD information is to prevent in the data comprising TOD information Segment signal is not also sent completely, and the first data select signal just carries out level switching and makes time synchronized Signal starts to send the PPS signal in next cycle.
It addition, in a kind of possible implementation of the present invention, the time of this time synchronizing signal is long Degree was less than 1 second, to prevent this time synchronizing signal from sticking together with next frame time synchronizing signal (i.e. signal can not identify the rising edge of PPS signal of next frame time synchronizing signal, causes first Clock board misidentifies).
It should be noted that in mode two, owing to the first clock board receives what timing node sent PPS signal and TOD signal, this PPS signal and TOD signal, may during transmission Disturbed by such as the interference factors such as noise jamming so that PPS signal is in the time span of high level Changing, therefore, in mode two, the first clock board is it needs to be determined that the first predetermined time period When and arriving less than the rising edge of this PPS signal in the time span of high level less than this PPS signal The time span carved and send between the initial time of this TOD information, the first clock board is determining the When one predetermined time period meets above-mentioned condition, then generate the first data select signal；First clock Plate, when determining that the first predetermined time period is unsatisfactory for above-mentioned condition, does not the most generate the first data and selects Signal.
In mode one, owing to this PPS signal and TOD signal are to be generated by the first clock board self , then this PPS signal can in the time span of high level and the initial time of this TOD information of transmission With free control, therefore, as long as and sending out in the time span of high level by adjusting this PPS signal The initial time giving this TOD information can make the first predetermined time period exist less than this PPS signal The time span of high level and arrive the moment less than the rising edge of this PPS signal and send this TOD letter Time span between the initial time of breath.
Further, this first clock board is determining that this first data select signal is second electrical level Time, send this PPS signal according to this first predetermined time period；Determining that these first data select When signal is the first level, send this TOD information according to this second predetermined time period.
Specifically, illustrate in conjunction with Fig. 2, Fig. 2 include the first data select signal waveform and The waveform of time synchronizing signal, wherein, in figure, the direction of arrow identifies each signal in time by the most extremely After, the first data select signal in figure is with the first level as high level, and second electrical level is low level As a example by illustrate, then in figure a moment be the first data select signal rising edge arrive the moment, The b moment is that the trailing edge of the first data select signal arrives the moment, then between a moment and b moment It is this first data select signal instruction time synchronizing signal and sends the time span of TOD information； The c moment is that the rising edge of time synchronizing signal arrives the moment, and the d moment is under time synchronizing signal Fall is along the moment that arrives, and the embodiment of the present invention is and to be comprised PPS signal by this time synchronizing signal The data segment signal of TOD information sends to second clock plate, and wherein, the m moment is same by the time The trailing edge of the data segment signal that step signal sends arrives the moment, and the n moment is this data segment signal Rising edge arrives the moment, when the rising edge of this data segment signal arrives, i.e. represents this TOD information It is sent completely；A is the first predetermined time period, and this first preset length is PPS signal The time that rising edge arrived between moment to the rising edge arrival moment of the first data select signal is long Degree；B is the second predetermined time period, and this second predetermined time period is these first data and selects The rising edge of signal arrived between moment to the trailing edge arrival moment of this first data select signal Time span (that is this first data select signal is in time span of high level), this is first years old Data select signal is low level at the first predetermined time period, is high at the second predetermined time period Level.
First clock board is (i.e. time synchronized letter after the rising edge determining this PPS signal arrives the moment Number rising edge arrive in moment, i.e. figure the c moment), the first data select signal starts to record the One predetermined time period, now, this first data select signal is low level, the first clock buttress PPS signal is sent by time synchronizing signal to second clock plate according to this first data select signal, When determining that this first data select signal writes the first predetermined time period (i.e. a moment) all over, this is years old One data select signal is converted to high level, and starts to record the second predetermined time period, now, This time synchronizing signal maintains high level, and the first clock board determines this in the second predetermined time period The trailing edge of data segment signal arrives after the moment (i.e. m moment), by time synchronizing signal to the Two clock boards send TOD information, are determining rising edge arrival moment (the i.e. n of this data segment signal Moment) after, determining that this TOD information is sent completely, this first data select signal is converted to low electricity Flat, in order to proceed follow-up signal transmission.
Need explanation time, the above-mentioned description for Fig. 2 is with the first level as high level, second Level is to illustrate as a example by low level, and the embodiment of the present invention is not limited thereto, it is also possible to be First level is low level, and second electrical level is high level, and its concrete implementation mode is similar to the above, Therefore repeat no more.
So, it is by a letter due to the first clock board by PPS signal and corresponding TOD signal Number (i.e. time synchronizing signal) sends to second clock plate, thus decreases active and standby clock board Between the interface of interaction time signal and connecting line, reduce and hand between master clock plate and standby clock board Mutually time signal realize cost and complexity.
It should be noted that second clock plate is after receiving this time synchronizing signal, from this time Synchronizing signal obtains PPS signal and TOD signal, and by outer time interface by PPS signal and TOD signal sends to downstream network device, to realize downstream network device and above-mentioned first clock board And the time synchronized between the network equipment corresponding to second clock plate, concrete as it is shown on figure 3, the party The executive agent of method embodiment is second clock plate, and the method includes:
S301, second clock plate receive the time synchronizing signal that the first clock board sends.
Wherein, this time synchronizing signal includes PPS signal and TOD information.
It should be noted that when the first clock board is main equipment, this second clock plate is standby setting Standby, when the first clock board is standby equipment, this second clock plate is main equipment.
S302, second clock buttress obtain this PPS signal and this TOD letter according to this time synchronizing signal Breath.
Further, second clock plate is obtaining this PPS signal according to this time synchronizing signal and is being somebody's turn to do Before TOD information, determine that the rising edge of this time synchronizing signal arrives the moment, and same according to this time Rising edge arrival moment, the first predetermined time period and second predetermined time period of step signal generate Second data select signal.
Wherein, this second data select signal is when this second clock plate of the first level indicating is by this Between synchronizing signal obtain this TOD information, indicate this second clock plate by this time at second electrical level Synchronizing signal obtains this PPS signal；This first level includes high level, and this second electrical level includes low Level；Or, this first level includes low level, and this second electrical level includes high level；
This first predetermined time period includes that the rising edge of this time synchronizing signal arrives the moment to being somebody's turn to do The level of the second data select signal initiates the time span between switching instant, and this is second when presetting Between length include that the level of this second data select signal initiates the moment of switching to these the second data Select the time span between the level switching instant again of signal.
S303, second clock buttress carry out time synchronized according to this PPS signal and this TOD information.
Specifically, second clock plate is when determining that this second data select signal is second electrical level, logical Crossing this time synchronizing signal and obtain this PPS signal, second clock plate is determining that these second data select When signal is the first level, obtaining this TOD information by this time synchronizing signal, such as, this is years old Two clock boards are standby clock board, and this first level is high level, and second electrical level is low level, second Clock board is low level determining this second data select signal, and determines the upper of time synchronizing signal Rise along when arriving, in the first predetermined time period, from this time synchronizing signal, obtain PPS letter Number, second clock plate is when determining that this second data select signal is high level, when second presets Between from this time synchronizing signal, obtain TOD information in length, and respectively by this PPS signal and TOD information is sent to downstream network device by the outer time interface on this second clock plate, in order to Time synchronized is carried out between the network equipment and downstream network device that this second clock plate is corresponding.
It should be noted that by foregoing description it can be seen that the first clock board by PPS signal and TOD information is sent to second clock plate and second clock buttress according to the time by time synchronizing signal Synchronizing signal obtains PPS signal and TOD information the two process is all real by data select signal Existing, therefore, the two process is considered as two reciprocal processes, and the i.e. first clock board will PPS signal and TOD information by time synchronizing signal send to second clock plate can be understood as by PPS signal and TOD information " synthesize " transmission in time synchronizing signal；Second clock buttress evidence Time synchronizing signal obtains PPS signal and TOD information can be understood as from time synchronizing signal " decompose " and go out PPS signal and TOD information.
So, second clock plate receives time synchronizing signal, and obtains from this time synchronizing signal PPS signal and corresponding TOD signal, thus decrease interaction time letter between active and standby clock board Number interface and connecting line, reduce the reality of interaction time signal between master clock plate and standby clock board Ready-made and complexity.
The embodiment of the present invention provide a kind of time synchronized method, the method be applied to the network equipment to Downstream network device sends PPS signal and the scene of TOD signal, and the method is applied to a kind of network Equipment, this network equipment includes master clock plate and for clock board, as shown in Figure 4, including:
S401, master clock plate generate PPS signal and the TOD signal of correspondence.
Wherein, this PPS signal is low level at one's leisure, and this TOD signal is high electricity at one's leisure Flat.
S402, master clock plate determine that the rising edge arrival moment of this PPS signal and this PPS signal exist The time span of high level, and determine that transmission should according to the rising edge arrival moment of this PPS signal The initial time of TOD information.
S403, master clock buttress are according to rising edge arrival moment, first Preset Time of this PPS signal Length and the second predetermined time period generate the first data select signal.
In the embodiment of the present invention, this first data select signal is to indicate this first clock at high level Plate sends this TOD information by this time synchronizing signal to this second clock plate, indicates in low level This first clock board sends this PPS signal by this time synchronizing signal to this second clock plate Example illustrates.
This first predetermined time period and is less than in the time span of high level less than this PPS signal The rising edge of this PPS signal arrives the time between moment and the initial time sending this TOD information Length, this second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
It should be noted that the rising edge that this first preset length is this PPS signal arrives, the moment is extremely The level of this first data select signal initiates the time span between switching instant, this second preset The level of this first data select signal a length of initiates switching instant and selects letter to these first data Number level switching instant again between time span.
Wherein, level initiates switching instant to be that data select signal is switched to by high level low level Moment (i.e. the trailing edge of this data select signal arrives the moment), then corresponding level switches again Moment is that data select signal is switched to the moment of high level (i.e. this data select signal by low level Rising edge arrive the moment)；Or, it is that data select signal is by low electricity that level initiates switching instant Truncation shifts to the moment (i.e. the rising edge of this data select signal arrives the moment) of high level, the most right The level answered switching instant again is that data select signal is switched to the low level moment by high level (i.e. the trailing edge of this data select signal arrives the moment).
S404, when determining that this first data select signal is low level, master clock plate is pre-first If sending PPS signal by time synchronizing signal to standby clock board in time span；Determine this When one data select signal is high level, master clock plate passes through the time in the second predetermined time period Synchronizing signal sends the TOD information in TOD signal to standby clock board.
Its concrete describing with reference to the above-mentioned description to Fig. 2, here is omitted.
S405, standby clock board receive this time synchronizing signal.
Wherein, this time synchronizing signal includes PPS signal and TOD information.
S406, standby clock board are when the rising edge determining this time synchronizing signal arrives, during according to this Between the rising edge of synchronizing signal arrive moment, the first predetermined time period and the second predetermined time period Generate the second data select signal.
In the present embodiment, this second clock plate is indicated to lead to this second data select signal at high level Cross this time synchronizing signal and obtain this TOD information, indicate this second clock plate by being somebody's turn to do in low level Time synchronizing signal illustrates as a example by obtaining this PPS signal, is not construed as limiting.
This first predetermined time period includes that the rising edge of this time synchronizing signal arrives the moment to being somebody's turn to do The level of the second data select signal initiates the time span between switching instant, and this is second when presetting Between length include that the level of this second data select signal initiates the moment of switching to these the second data Select the time span between the level switching instant again of signal.
S407, standby clock board are when determining that this second data select signal is low level, pre-first If obtaining PPS signal from time synchronizing signal in time span；Determining that these second data select When signal is high level, in the second predetermined time period, from time synchronizing signal, obtain TOD letter Breath.
This PPS signal and TOD information are sent to downstream network device by S408, standby clock board respectively, So that this downstream network device carries out the time according to this PPS signal and TOD information with this network equipment Synchronize.
Illustratively, standby clock board is low level determining this second data select signal, and when determining Between synchronizing signal rising edge arrive time, from this time synchronizing signal in the first predetermined time period Middle acquisition PPS signal, for clock board when determining that this second data select signal is high level, From this time synchronizing signal, obtain TOD information in second predetermined time period, and respectively should PPS signal and TOD information are sent to downstream network by the outer time interface on this second clock plate Equipment, in order to this for carry out between the corresponding network equipment and the downstream network device of clock board the time with Step.
Use such scheme, owing to PPS signal and corresponding TOD signal are to pass through by master clock plate One signal (i.e. time synchronizing signal) sends to standby clock board, thus when decreasing active and standby Between clock plate, the interface of interaction time signal and connecting line, set with downstream network realizing the network equipment In time synchronization process between Bei, reduce interaction time letter between master clock plate and standby clock board Number realize cost and complexity.
It should be noted that for above-mentioned embodiment of the method, in order to be briefly described, therefore by it all Being expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not Limited by described sequence of movement, because according to the present invention, some step can use other Sequentially or carry out simultaneously.Secondly, those skilled in the art also should know, is retouched in description The embodiment stated belongs to preferred embodiment, involved action and the module not necessarily present invention Necessary.
The embodiment of the present invention provides a kind of method of time synchronized, and the method is applied to the network equipment and connects Receive BITS or the PPS signal of upstream network device transmission and the scene of TOD signal, the method Being applied to a kind of network equipment, this network equipment includes master clock plate and standby clock board, such as Fig. 5 institute Show, including:
S501, standby clock board receive BITS or the PPS signal of upstream network device transmission and TOD Signal.
Wherein, this PPS signal is low level at one's leisure, and this TOD signal is high electricity at one's leisure Flat.
The rising edge that S502, standby clock board obtain this PPS signal according to this PPS signal arrives the moment With this PPS signal in the time span of high level, and when arriving according to the rising edge of this PPS signal Carve and determine the initial time sending this TOD information.
S503, standby clock board are determining that the first predetermined time period is less than this PPS signal at high level Time span and less than this PPS signal rising edge arrive the moment with send this TOD information rise During the time span beginning between the moment, long according to arrive moment, this first Preset Time of this rising edge Degree and the second predetermined time period generate the first data select signal.
In the embodiment of the present invention, the first data select signal is to indicate this first clock board at high level This TOD information is sent to this second clock plate by this time synchronizing signal, should in low level instruction First clock board by this time synchronizing signal as a example by this second clock plate sends this PPS signal Illustrate, be not construed as limiting herein.This second predetermined time period is more than the transmission of this TOD information Initial time is to the time span between the moment being sent completely this TOD information.
S504, when determining that this first data select signal is low level, standby clock board is pre-first If sending PPS signal by time synchronizing signal to master clock plate in time span；Determine this When one data select signal is high level, standby clock board passes through the time in the second predetermined time period Synchronizing signal sends the TOD information in TOD signal to master clock plate.
Its concrete describing with reference to the above-mentioned description to Fig. 2, here is omitted.
S505, master clock plate receive this time synchronizing signal.
Wherein, this time synchronizing signal includes PPS signal and TOD information.
S506, master clock plate are when the rising edge determining this time synchronizing signal arrives, during according to this Between the rising edge of synchronizing signal arrive moment, the first predetermined time period and the second predetermined time period Generate the second data select signal.
In the present embodiment, this second clock plate is indicated to lead to this second data select signal at high level Cross this time synchronizing signal and obtain this TOD information, indicate this second clock plate by being somebody's turn to do in low level Time synchronizing signal illustrates as a example by obtaining this PPS signal, is not construed as limiting.
This first predetermined time period includes that the rising edge of this time synchronizing signal arrives the moment to being somebody's turn to do The level of the second data select signal initiates the time span between switching instant, and this is second when presetting Between length include that the level of this second data select signal initiates the moment of switching to these the second data Select the time span between the level switching instant again of signal.
S507, master clock plate are when determining that this second data select signal is low level, pre-first If obtaining PPS signal from time synchronizing signal in time span；Determining that these second data select When signal is high level, in the second predetermined time period, from time synchronizing signal, obtain TOD letter Breath.
S508, master clock plate are respectively according to this PPS signal and TOD information and BITS or upstream The network equipment carries out time synchronized.
Use such scheme, owing to standby clock board will receive from BITS or upstream network device PPS signal and corresponding TOD signal are to be sent extremely by a signal (i.e. time synchronizing signal) Second clock plate, thus decrease interface and the company of interaction time signal between active and standby clock board Wiring, at the time synchronization process realized between the network equipment and BITS or upstream network device In, reduce interaction time signal between master clock plate and standby clock board realizes cost and complexity Degree.
It should be noted that for above-mentioned embodiment of the method, in order to be briefly described, therefore by it all Being expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not Limited by described sequence of movement, because according to the present invention, some step can use other Sequentially or carry out simultaneously.Secondly, those skilled in the art also should know, is retouched in description The embodiment stated belongs to preferred embodiment, involved action and the module not necessarily present invention Necessary.
The embodiment of the present invention provides a kind of clock board 60, and as shown in Figure 6, this clock board 60 includes:
Acquiring unit 61, for obtaining PPS signal and corresponding TOD signal.
Wherein, this PPS signal is low level at one's leisure, and this TOD signal is high electricity at one's leisure Flat.
Alternatively, when this clock board is master clock plate, this acquiring unit specifically for, generate PPS signal and TOD signal；
When this clock board is standby clock board, this acquiring unit specifically for, receive timing node and send out The PPS signal sent and TOD signal.
Transmitting element 62, believes for this PPS signal obtained by this acquiring unit 61 and this TOD TOD information in number is sent to second clock plate by time synchronizing signal, in order to this second clock Buttress carries out time synchronized according to this time synchronizing signal.
Wherein, this time synchronizing signal includes this PPS signal and this TOD information.
It should be noted that this time synchronizing signal carves holding low level at one's leisure, due to PPS Signal is low level at one's leisure, and therefore, the rising edge arrival moment of this time synchronizing signal is The rising edge of this PPS signal arrives the moment, and this time synchronizing signal is after rising edge arrives, always Maintain high level, until after having sent this TOD information, this time synchronizing signal switches back into low level.
It addition, in embodiments of the present invention, this TOD information can be passed through on time synchronizing signal Data segment signal is transmitted, and this data segment signal is used for transmitting TOD information in TOD signal, This data segment signal is high level at one's leisure.
Alternatively, as shown in Figure 7a, when this clock board is master clock plate, this clock board 60 is also Including:
Processing unit 63, believed for the rising edge arrival moment and this PPS determining this PPS signal Number in the time span of high level, and determine transmission according to the rising edge of this PPS signal moment that arrives The initial time of this TOD information.
First signal signal generating unit 64, for this PPS signal determined according to this processing unit 63 Arrive moment, the first predetermined time period and the second predetermined time period of rising edge generate the first number According to selecting signal.
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate；This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level.
This first predetermined time period and is less than in the time span of high level less than this PPS signal The rising edge of this PPS signal arrives the time between moment and the initial time sending this TOD information Length；This second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
It should be noted that the rising edge that this first preset length is this PPS signal arrives, the moment is extremely The level of this first data select signal initiates the time span between switching instant, this second preset The level of this first data select signal a length of initiates switching instant and selects letter to these first data Number level switching instant again between time span.
Wherein, level initiates switching instant to be that data select signal is switched to by high level low level Moment (i.e. the trailing edge of this data select signal arrives the moment), then corresponding level switches again Moment is that data select signal is switched to the moment of high level (i.e. this data select signal by low level Rising edge arrive the moment)；Or, it is that data select signal is by low electricity that level initiates switching instant Truncation shifts to the moment (i.e. the rising edge of this data select signal arrives the moment) of high level, the most right The level answered switching instant again is that data select signal is switched to the low level moment by high level (i.e. the trailing edge of this data select signal arrives the moment).
Alternatively, as shown in Figure 7b, when this clock board is standby clock board, this clock board 60 is also Including:
Detector unit 65, arrives for obtaining the rising edge of this PPS signal according to this PPS signal Moment and this PPS signal are in the time span of high level, and arrive according to the rising edge of this PPS signal The next moment determines the initial time sending this TOD information, and determines that the first predetermined time period is less than This PPS signal high level time span and less than this PPS signal rising edge arrive the moment with Send the time span between the initial time of this TOD information；
In this detector unit 65, secondary signal signal generating unit 66, for determining that the first Preset Time is long Degree arrives less than this PPS signal time span at high level and the rising edge less than this PPS signal During time span between moment and the initial time sending this TOD information, arrive according to this rising edge Come moment, this first predetermined time period and the second predetermined time period and generate the first data selection letter Number；
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate；This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level；
This second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
It should be noted that above-mentioned first predetermined time period is less than this PPS signal at high level Time span and arrive the moment less than the rising edge of this PPS signal and send the initial of this TOD information Time span between moment is to prevent from sending PPS signal (the i.e. first data select signal For second electrical level) time, in the first predetermined time period, the data segment comprising TOD information detected The trailing edge of signal, such as, if the first predetermined time period arrives more than the rising edge of this PPS signal Carry out the time span between moment and the initial time sending this TOD information, then comprise TOD letter When the trailing edge (i.e. sending the initial time of this TOD information) of the data segment signal of breath arrives, should First data select signal does not switches to the first level from second electrical level, say, that, although should The delivery time of TOD information has arrived, but this TOD information does not send, thus causes PSS The confusion that signal and TOD information send.Therefore, this first predetermined time period should be less than being somebody's turn to do The PPS signal time span at high level and the rising edge less than this PPS signal arrive the moment and send out Give the time span between the initial time of this TOD information.
Above-mentioned second predetermined time period is more than the transmission initial time of this TOD information to having sent Becoming the time span between the moment of this TOD information is to prevent in the data comprising TOD information Segment signal is not also sent completely, and the first data select signal just carries out level switching and makes time synchronized Signal starts to send the PPS signal in next cycle.
It addition, in a kind of possible implementation of the present invention, the time of this time synchronizing signal is long Degree was less than 1 second, to prevent this time synchronizing signal from sticking together with next frame time synchronizing signal (i.e. signal can not identify the rising edge of PPS signal of next frame time synchronizing signal, causes first Clock board misidentifies).
Further, this transmitting element 62 specifically for, determining this first data select signal During for low level, send this PPS signal according to this first predetermined time period；
When determining that this first data select signal is high level, according to this second predetermined time period Send this TOD information.
Specifically, illustrate in conjunction with Fig. 2, Fig. 2 include the first data select signal waveform and The waveform of time synchronizing signal, wherein, in figure, the direction of arrow identifies each signal in time by the most extremely After, the first data select signal in figure is with the first level as high level, and second electrical level is low level As a example by illustrate, then in figure a moment be the first data select signal rising edge arrive the moment, The b moment is that the trailing edge of the first data select signal arrives the moment, then between a moment and b moment It is this first data select signal instruction time synchronizing signal and sends the time span of TOD information； The c moment is that the rising edge of time synchronizing signal arrives the moment, and the d moment is under time synchronizing signal Fall is along the moment that arrives, and the embodiment of the present invention is and to be comprised PPS signal by this time synchronizing signal The data segment signal of TOD information sends to second clock plate, and wherein, the m moment is same by the time The trailing edge of the data segment signal that step signal sends arrives the moment, and the n moment is this data segment signal Rising edge arrives the moment, when the rising edge of this data segment signal arrives, i.e. represents this TOD information It is sent completely；A is the first predetermined time period, and this first preset length is PPS signal The time that rising edge arrived between moment to the rising edge arrival moment of the first data select signal is long Degree；B is the second predetermined time period, and this second predetermined time period is these first data and selects The rising edge of signal arrived between moment to the trailing edge arrival moment of this first data select signal Time span (that is this first data select signal is in time span of high level), this is first years old Data select signal is low level at the first predetermined time period, is high at the second predetermined time period Level.
This clock board is (i.e. time synchronizing signal after the rising edge determining this PPS signal arrives the moment Rising edge arrive in moment, i.e. figure the c moment), the first data select signal starts to record first Predetermined time period, now, this first data select signal is low level, and this clock board is according to being somebody's turn to do First data select signal sends PPS signal by time synchronizing signal to second clock plate, really When this first data select signal fixed writes the first predetermined time period (i.e. a moment) all over, this first number According to selecting signal to be converted to high level, and start to record the second predetermined time period, now, this time Between synchronizing signal maintain high level, this clock plate determines that in the second predetermined time period this data segment is believed Number trailing edge arrive after moment (i.e. m moment), by time synchronizing signal to second clock plate Send TOD information, after the rising edge determining this data segment signal arrives the moment (i.e. n moment), Determining that this TOD information is sent completely, this first data select signal is converted to low level, in order to continue Continue and carry out follow-up signal transmission.
Need explanation time, the above-mentioned description for Fig. 2 is with the first level as high level, second Level is to illustrate as a example by low level, and the embodiment of the present invention is not limited thereto, it is also possible to be First level is low level, and second electrical level is high level, and its concrete implementation mode is similar to the above, Therefore repeat no more.
Use above-mentioned clock board, owing to PPS signal and corresponding TOD signal are to pass through by clock board One signal (i.e. time synchronizing signal) sends to second clock plate, thus decreases active and standby The interface of interaction time signal and connecting line between clock board, reduce master clock plate and standby clock board Between interaction time signal realize cost and complexity.
A kind of clock board 80 of embodiment of the present invention offer, as shown in Figure 8, including:
Acquiring unit 81, for receiving the time synchronizing signal that the first clock board sends.
Wherein, this time synchronizing signal includes PPS signal and TOD information.
Processing unit 82, obtains this PPS according to the time synchronizing signal that this acquiring unit 81 obtains Signal and this TOD information；
Lock unit 83, for this PPS signal obtained according to this processing unit 82 and this TOD Information carries out time synchronized.
Optionally, as it is shown in figure 9, this clock board 80 also includes: detector unit 84, for really The rising edge of this time synchronizing signal fixed arrives the moment；
First signal signal generating unit 85, for the time synchronized letter determined according to this detector unit 84 Number arrive moment, the first predetermined time period and the second predetermined time period of rising edge generate second Data select signal；
Wherein, this second data select signal is when this second clock plate of the first level indicating is by this Between synchronizing signal obtain this TOD information, indicate this second clock plate by this time at second electrical level Synchronizing signal obtains this PPS signal；This first level includes high level, and this second electrical level includes low Level；Or, this first level includes low level, and this second electrical level includes high level；
This first predetermined time period includes that the rising edge of this time synchronizing signal arrives the moment to being somebody's turn to do The level of the second data select signal initiates the time span between switching instant, and this is second when presetting Between length include that the level of this second data select signal initiates the moment of switching to these the second data Select the time span between the level switching instant again of signal.
Wherein, level initiates switching instant to be that data select signal is switched to by high level low level Moment (i.e. the trailing edge of this data select signal arrives the moment), then corresponding level switches again Moment is that data select signal is switched to the moment of high level (i.e. this data select signal by low level Rising edge arrive the moment)；Or, it is that data select signal is by low electricity that level initiates switching instant Truncation shifts to the moment (i.e. the rising edge of this data select signal arrives the moment) of high level, the most right The level answered switching instant again is that data select signal is switched to the low level moment by high level (i.e. the trailing edge of this data select signal arrives the moment).
Further, this processing unit 82 specifically for, determining this second data select signal During for second electrical level, obtain this PPS signal by this time synchronizing signal.
When determining that this second data select signal is the first level, obtained by this time synchronizing signal Obtain this TOD information.
Illustratively, this clock board is standby clock board, and this first level is high level, and second electrical level is Low level, this clock board is low level determining this second data select signal, and determines that the time same When the rising edge of step signal arrives, obtain from this time synchronizing signal in the first predetermined time period Obtaining PPS signal, this clock board is when determining that this second data select signal is high level, second From this time synchronizing signal, obtain TOD information in predetermined time period, and respectively this PPS is believed Number and TOD information sent to downstream network device by outer time interface on this second clock plate, To carry out time synchronized between the network equipment that this second clock plate is corresponding and downstream network device.
Using above-mentioned clock board, clock board receives time synchronizing signal, and from this time synchronizing signal Middle acquisition PPS signal and corresponding TOD signal, thus decrease between active and standby clock board mutual The interface of time signal and connecting line, reduce interaction time letter between master clock plate and standby clock board Number realize cost and complexity.
A kind of clock board 100 of embodiment of the present invention offer, as shown in Figure 10, including:
Controllable counter 101, arrives the moment for receiving the rising edge of PPS signal, and according to this Rising edge arrival moment, the first preset time period of storage and second preset time period of PPS signal Generate the first data select signal.
Wherein, this first predetermined time period less than this PPS signal high level time span and Arrive between moment and the initial time sending this TOD information less than the rising edge of this PPS signal Time span, this second predetermined time period extremely sends more than the transmission initial time of this TOD information Complete the time span between the moment of this TOD information.
Specifically, controllable counter arrived at the rising edge receiving PPS signal after the moment, started Record the first predetermined time period, after writing this first predetermined time period all over, carry out level switching (switched to high level by low level or switched to low level by high level), after switch level, Start to record the second predetermined time period, after writing this first predetermined time period all over, again carry out Level switches.
Active and standby mutual sending end mouth 102, for receiving the first data choosing that this controllable counter 101 sends Select signal, and according to this data select signal by the TOD in the PPS signal received and TOD signal Information is sent to second clock plate by time synchronizing signal, in order to second clock buttress is according to this PPS Signal and TOD information carry out time synchronized.
Specifically, when determining that this data select signal is second electrical level, PPS is believed by this clock board Number by time synchronizing signal send to second clock plate, determining that this data select signal is first During level, TOD information is sent to second clock plate by this clock board by time synchronizing signal, its In, this first level can be low level, and second electrical level can be high level；Or, this is first years old Level can be high level, and second electrical level can be low level.
Alternatively, as shown in fig. 11a, this clock board 100 also includes:
PPS signal transmitting terminal 103, is used for generating PPS signal, and by the PPS signal of generation Rising edge arrives moment transmission to controllable counter.
TOD signal sending end 104, is used for generating TOD signal, and is sent out by the TOD signal of generation Deliver to active and standby mutual sending end mouth.
It should be noted that this clock board can be master clock plate.
Alternatively, as shown in figure 11b, this clock board 100 also includes:
Outer time interface 105, for receiving PPS signal and the TOD signal that timing node sends, And this PPS signal and TOD signal are sent to active and standby mutual sending end mouth.
Wherein, this timing node can be BITS or upstream network device.
PPS signal detection module 106, true for the PPS signal received according to this outer time interface The rising edge determining PPS signal arrives the moment, and the moment that arrived by the rising edge of this PPS signal sends To controllable counter.
It should be noted that this clock board can be standby clock board.
A kind of clock board 120 of embodiment of the present invention offer, as shown in figure 12, including:
Active and standby mutual sending end mouth 121, for receiving the time synchronizing signal that the first clock board sends.
Wherein, this time synchronizing signal includes PPS signal and TOD information.
PPS signal detection module 122, for detecting the time that this active and standby mutual sending end mouth 121 receives The rising edge of synchronizing signal arrives the moment.
Controllable counter 123, for the rising edge arrival moment according to this time synchronizing signal, deposits First predetermined time period and second predetermined time period of storage generate the second data select signal.
Wherein, this first predetermined time period less than this PPS signal high level time span and Arrive between moment and the initial time sending this TOD information less than the rising edge of this PPS signal Time span；This second predetermined time period extremely sends more than the transmission initial time of this TOD information Complete the time span between the moment of this TOD information.
Alternatively, as depicted in fig. 13 a, this clock board 120 also includes:
PPS signal receiving terminal 124, selects letter for the second data generated according to controllable counter Number from time synchronizing signal, obtain PPS signal.
TOD signal receiving end 125, for the second data choosing generated according to controllable counter 123 Select the TOD information that signal obtains in TOD signal from time synchronizing signal.
Specifically, when determining that this second data select signal is the first level, believe from time synchronized Obtain the TOD information in TOD signal in number, determining that this second data select signal is the second electricity At ordinary times, obtaining PPS signal from time synchronizing signal, wherein, this first level is high level, Second electrical level is low level；Or, this first level is low level, and second electrical level is high level.
It should be noted that this clock board can be master clock plate.
Alternatively, as illustrated in fig. 13b, this clock board 120 also includes:
Outer time interface 126, selects letter for the second data generated according to controllable counter 123 From time synchronizing signal, number obtain the TOD information in PPS signal and TOD signal respectively, and point PPS signal and TOD signal are not sent to downstream network device.
Specifically, when determining that this second data select signal is the first level, believe from time synchronized Obtain the TOD information in TOD signal in number, determining that this second data select signal is the second electricity At ordinary times, obtaining PPS signal from time synchronizing signal, wherein, this first level is high level, Second electrical level is low level；Or, this first level is low level, and second electrical level is high level.
It should be noted that this clock board can be standby clock board.
A kind of network equipment 140 of embodiment of the present invention offer, as shown in figure 14, including:
Clock board 60 that above-mentioned Fig. 6 or Fig. 7 (Fig. 7 a and Fig. 7 b) describes and above-mentioned Fig. 8 or figure 9 clock boards 80 described.
A kind of network equipment 150 of embodiment of the present invention offer, as shown in fig. 15 a, including: above-mentioned The clock board that the clock board 100 of Figure 10 or Figure 11 a description and above-mentioned Figure 12 or Figure 13 b describe 120；Or, as illustrated in fig. 15b, including:
The clock board 100 of above-mentioned Figure 10 or Figure 11 b description and above-mentioned Figure 12 or Figure 13 a describe Clock board 120.
The embodiment of the present invention provides a kind of clock board 160, as shown in figure 16, this clock board 160 Including:
Processor (processor) 161, communication interface (Communications Interface) 162, memorizer (memory) 163 and communication bus 164；Wherein, described processor 161, Described communication interface 162 and described memorizer 163 are completed by described communication bus 164 each other Communication.
Processor 161 is probably a central processor CPU, or specific integrated circuit ASIC (Application Specific Integrated Circuit), or be configured to implement One or more integrated circuits of the embodiment of the present invention.
Memorizer 163 is used for depositing program code, and described program code includes that computer operation refers to Order.Memorizer 163 may comprise high-speed RAM memorizer, it is also possible to also includes non-volatile memories Device (non-volatile memory), for example, at least one disk memory.
Described communication interface 162, for realizing the connection communication between these devices.
Described processor 161 performs program code, for obtaining pulse per second (PPS) PPS signal and correspondence Temporal information TOD signal；And the TOD information in described PPS signal and described TOD signal is led to Cross time synchronizing signal to send to second clock plate, in order to described second clock buttress is according to the described time Synchronizing signal carries out time synchronized, wherein, described time synchronizing signal include described PPS signal and Described TOD information.
Alternatively, this processor 161 specifically for, when this first clock board is master clock plate, Generate PPS signal and TOD signal；When this first clock board is standby clock board, segmentum intercalaris during reception The PPS signal of some transmission and TOD signal.
Alternatively, this processor 161 is additionally operable to, when this first clock board is master clock plate, and should TOD information in this PPS signal and this TOD signal is sent to second by time synchronizing signal Before clock board, determine that the rising edge of this PPS signal arrives moment and this PPS signal at high level Time span, and determine this TOD information of transmission according to the rising edge arrival moment of this PPS signal Initial time, and according to the rising edge of this PPS signal arrive the moment, the first predetermined time period and Second predetermined time period generates the first data select signal；
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate；This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level；
This first predetermined time period and is less than in the time span of high level less than this PPS signal The rising edge of this PPS signal arrives the time between moment and the initial time sending this TOD information Length；This second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
Alternatively, this processor 161 is additionally operable to, when this first clock board is standby clock board, and should TOD information in this PPS signal and this TOD signal is sent to second by time synchronizing signal Before clock board, obtain rising edge arrival moment and this PPS of this PPS signal according to this PPS signal Signal is in the time span of high level, and determines send out according to the rising edge of this PPS signal moment that arrives Give the initial time of this TOD information, determining that the first predetermined time period exists less than this PPS signal The time span of high level and arrive the moment less than the rising edge of this PPS signal and send this TOD letter Breath initial time between time span time, according to this rising edge arrive the moment, this first preset Time span and the second predetermined time period generate the first data select signal；
Wherein, this first data select signal is when this first clock board of the first level indicating is by this Between synchronizing signal send this TOD information to this second clock plate, second electrical level indicate this first time Clock plate sends this PPS signal by this time synchronizing signal to this second clock plate；This first level Including high level, this second electrical level includes low level；Or, this first level includes low level, This second electrical level includes high level；
This second predetermined time period is more than the transmission initial time of this TOD information to being sent completely Time span between the moment of this TOD information.
Alternatively, this processor 161 specifically for, determining that this first data select signal is During two level, send this PPS signal according to this first predetermined time period；Determining this first number When being the first level according to selecting signal, send this TOD information according to this second predetermined time period.
The embodiment of the present invention provides a kind of clock board 170, as shown in figure 17, this clock board 170 Including:
Processor (processor) 171, communication interface (Communications Interface) 172, memorizer (memory) 173 and communication bus 174；Wherein, described processor 171, Described communication interface 172 and described memorizer 173 are completed by described communication bus 174 each other Communication.
Processor 171 is probably a central processor CPU, or specific integrated circuit ASIC (Application Specific Integrated Circuit), or be configured to implement One or more integrated circuits of the embodiment of the present invention.
Memorizer 173 is used for depositing program code, and described program code includes that computer operation refers to Order.Memorizer 173 may comprise high-speed RAM memorizer, it is also possible to also includes non-volatile memories Device (non-volatile memory), for example, at least one disk memory.
Described communication interface 172, for realizing the connection communication between these devices.
Described processor 171 performs program code, same for receiving the time of the first clock board transmission Step signal, wherein, described time synchronizing signal includes PPS signal and TOD information, according to described Time synchronizing signal obtains described PPS signal and described TOD information, and according to described PPS signal Time synchronized is carried out with described TOD information.
Alternatively, this processor 171 is additionally operable to, and is obtaining this PPS according to this time synchronizing signal Before signal and this TOD information, determine that the rising edge of this time synchronizing signal arrives the moment, and according to Rising edge arrival moment, the first predetermined time period and second Preset Time of this time synchronizing signal Length generates the second data select signal；
Wherein, this second data select signal is when this second clock plate of the first level indicating is by this Between synchronizing signal obtain this TOD information, indicate this second clock plate by this time at second electrical level Synchronizing signal obtains this PPS signal；This first level includes high level, and this second electrical level includes low Level；Or, this first level includes low level, and this second electrical level includes high level；
This first predetermined time period includes that the rising edge of this time synchronizing signal arrives the moment to being somebody's turn to do The level of the second data select signal initiates the time span between switching instant, and this is second when presetting Between length include that the level of this second data select signal initiates the moment of switching to these the second data Select the time span between the level switching instant again of signal.
Alternatively, this processor 171 specifically for, determining that this second data select signal is During two level, obtain this PPS signal by this time synchronizing signal；Determining that these second data are selected Select signal when being the first level, obtain this TOD information by this time synchronizing signal.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not Being confined to this, any those familiar with the art is at the technical scope that the invention discloses In, change can be readily occurred in or replace, all should contain within protection scope of the present invention.Therefore, Protection scope of the present invention should described be as the criterion with scope of the claims.

Claims (11)

1. the method for a time synchronized, it is characterised in that including:
First clock board obtains pulse per second (PPS) PPS signal and corresponding temporal information TOD signal；
TOD information in described PPS signal and described TOD signal is passed through time synchronizing signal Send to second clock plate, in order to described second clock buttress is carried out according to described time synchronizing signal Time synchronized, wherein, described time synchronizing signal includes described PPS signal and described TOD letter Breath；
When described first clock board is master clock plate, described first clock board obtains PPS signal Include with TOD signal:
Described first clock board generates PPS signal and TOD signal；
When described first clock board is standby clock board, described first clock board obtains PPS signal Include with TOD signal: described first clock board receives PPS signal and the TOD that timing node sends Signal；
When described first clock board is master clock plate, described by described PPS signal with described TOD TOD information in signal is sent to second clock plate by time synchronizing signal, described method Also include:
Determine that the rising edge of described PPS signal arrives moment and described PPS signal at high level Time span, and determine the described TOD of transmission according to the rising edge arrival moment of described PPS signal The initial time of information；
Rising edge arrival moment, the first predetermined time period and second according to described PPS signal Predetermined time period generates the first data select signal；
Wherein, described first data select signal leads at the first clock board described in the first level indicating Cross described time synchronizing signal and send described TOD information to described second clock plate, at the second electricity Described first clock board of flat instruction is sent to described second clock plate by described time synchronizing signal Described PPS signal；Described first level includes that high level, described second electrical level include low level； Or, described first level includes that low level, described second electrical level include high level；
Described first predetermined time period less than described PPS signal high level time span and Arrive moment and the initial time of the described TOD information of transmission less than the rising edge of described PPS signal Between time span；Described second predetermined time period rises more than the transmission of described TOD information Begin the time span between the moment to the moment being sent completely described TOD information.
Method the most according to claim 1, it is characterised in that when described first clock board During for standby clock board, described TOD information in described PPS signal and described TOD signal is led to Crossing time synchronizing signal to send to second clock plate, described method also includes:
The rising edge arrival moment of described PPS signal and described PPS is obtained according to described PPS signal Signal is in the time span of high level, and the rising edge arrival moment according to described PPS signal is true Surely the initial time of described TOD information is sent；
Determining that the first predetermined time period is less than the described PPS signal time span at high level And less than described PPS signal rising edge arrive the moment with send described TOD information initial time During time span between quarter, arrive moment, described first Preset Time according to described rising edge Length and the second predetermined time period generate the first data select signal；
Wherein, described first data select signal leads at the first clock board described in the first level indicating Cross described time synchronizing signal and send described TOD information to described second clock plate, at the second electricity Described first clock board of flat instruction is sent to described second clock plate by described time synchronizing signal Described PPS signal；Described first level includes that high level, described second electrical level include low level； Or, described first level includes that low level, described second electrical level include high level；
Described second predetermined time period extremely sends more than the transmission initial time of described TOD information Complete the time span between the moment of described TOD information.
Method the most according to claim 1 and 2, it is characterised in that described by described PPS TOD information in signal and described TOD signal is sent to second clock by time synchronizing signal Plate, including:
When determining that described first data select signal is second electrical level, preset according to described first Time span sends described PPS signal；
When determining that described first data select signal is the first level, preset according to described second Time span sends described TOD information.
4. the method for a time synchronized, it is characterised in that including:
Second clock plate receives the time synchronizing signal that the first clock board sends, wherein, time described Between synchronizing signal include PPS signal and TOD information；
Described PPS signal and described TOD information is obtained according to described time synchronizing signal；
Time synchronized is carried out according to described PPS signal and described TOD information；
Described PPS signal and described TOD information is obtained according to described time synchronizing signal described Before, also include:
Determine that the rising edge of described time synchronizing signal arrives the moment；
Rising edge according to described time synchronizing signal arrive the moment, the first predetermined time period and Second predetermined time period generates the second data select signal；
Wherein, described second data select signal leads at second clock plate described in the first level indicating Cross described time synchronizing signal and obtain described TOD information, when second electrical level instruction described second Clock plate obtains described PPS signal by described time synchronizing signal；Described first level includes height Level, described second electrical level includes low level；Or, described first level includes low level, Described second electrical level includes high level；
Described first predetermined time period includes that the rising edge of described time synchronizing signal arrives the moment Level to described second data select signal initiates the time span between switching instant, described Second predetermined time period includes that the level of described second data select signal initiates the moment of switching Time span between the level switching instant again of described second data select signal.
Method the most according to claim 4, it is characterised in that described according to the described time Synchronizing signal obtains described PPS signal and described TOD information, including:
When determining that described second data select signal is second electrical level, by described time synchronized PPS signal described in signal acquisition；
When determining that described second data select signal is the first level, by described time synchronized TOD information described in signal acquisition.
6. a clock board, it is characterised in that including:
Acquiring unit, for obtaining PPS signal and corresponding TOD signal；
Transmitting element, for the described PPS signal obtained by described acquiring unit and described TOD TOD information in signal is sent to second clock plate by time synchronizing signal, in order to described the Two clock boards carry out time synchronized, wherein, described time synchronized according to described time synchronizing signal Signal includes described PPS signal and described TOD information；
When described clock board is master clock plate, described acquiring unit specifically for, generate PPS Signal and TOD signal；
When described clock board is standby clock board, described acquiring unit specifically for, receive the time The PPS signal of node transmission and TOD signal；
When described clock board is master clock plate, described clock board also includes:
Processing unit, for determining the rising edge arrival moment of described PPS signal and described PPS Signal is in the time span of high level, and the rising edge arrival moment according to described PPS signal is true Surely the initial time of described TOD information is sent；
First signal signal generating unit, for the described PPS signal determined according to described processing unit Arrive moment, the first predetermined time period and the second predetermined time period of rising edge generate first Data select signal；
Wherein, described first data select signal passes through institute at clock board described in the first level indicating State time synchronizing signal and send described TOD information to described second clock plate, refer at second electrical level Show that described clock board sends described PPS by described time synchronizing signal to described second clock plate Signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described first predetermined time period less than described PPS signal high level time span and Arrive moment and the initial time of the described TOD information of transmission less than the rising edge of described PPS signal Between time span；Described second predetermined time period rises more than the transmission of described TOD information Begin the time span between the moment to the moment being sent completely described TOD information.
Clock board the most according to claim 6, it is characterised in that when described clock board is During standby clock board, described clock board also includes:
Detector unit, arrives for obtaining the rising edge of described PPS signal according to described PPS signal Carry out moment and the described PPS signal time span at high level, and according to described PPS signal The rising edge arrival moment determines the initial time sending described TOD information, and determines that first presets Time span in the time span of high level and is less than described PPS signal less than described PPS signal Rising edge arrive the time span between moment and the initial time sending described TOD information；
Secondary signal signal generating unit, for determining the first predetermined time period in described detector unit Less than described PPS signal in the time span of high level and less than the rising edge of described PPS signal During the time span between moment and the initial time sending described TOD information that arrives, according to institute State rising edge arrival moment, described first predetermined time period and the second predetermined time period to generate First data select signal；
Wherein, described first data select signal passes through institute at clock board described in the first level indicating State time synchronizing signal and send described TOD information to described second clock plate, refer at second electrical level Show that described clock board sends described PPS by described time synchronizing signal to described second clock plate Signal；Described first level includes that high level, described second electrical level include low level；Or, Described first level includes that low level, described second electrical level include high level；
Described second predetermined time period extremely sends more than the transmission initial time of described TOD information Complete the time span between the moment of described TOD information.
8. according to the clock board described in claim 6 or 7, it is characterised in that described transmission list Unit specifically for, when determining that described first data select signal is low level, according to described the One predetermined time period sends described PPS signal；
When determining that described first data select signal is high level, when presetting according to described second Between length send described TOD information.
9. a clock board, it is characterised in that including:
Acquiring unit, for receiving the time synchronizing signal that the first clock board sends, wherein, institute State time synchronizing signal and include PPS signal and TOD information；
Processing unit, the time synchronizing signal obtained according to described acquiring unit obtains described PPS Signal and described TOD information；
Lock unit, for the described PPS signal obtained according to described processing unit and described TOD Information carries out time synchronized；
Described clock board also includes:
Detector unit, for determining that the rising edge of described time synchronizing signal arrives the moment；
First signal signal generating unit, for the time synchronizing signal determined according to described detector unit Arrive moment, the first predetermined time period and the second predetermined time period of rising edge generate second Data select signal；
Wherein, described second data select signal passes through institute at clock board described in the first level indicating State time synchronizing signal and obtain described TOD information, indicate described clock board to pass through at second electrical level Described time synchronizing signal obtains described PPS signal；Described first level includes high level, institute State second electrical level and include low level；Or, described first level includes low level, described second Level includes high level；
Described first predetermined time period includes that the rising edge of described time synchronizing signal arrives the moment Level to described second data select signal initiates the time span between switching instant, described Second predetermined time period includes that the level of described second data select signal initiates the moment of switching Time span between the level switching instant again of described second data select signal.
Clock board the most according to claim 9, it is characterised in that described processing unit Specifically for, when determining that described second data select signal is second electrical level, by time described Between synchronizing signal obtain described PPS signal；
When determining that described second data select signal is the first level, by described time synchronized TOD information described in signal acquisition.
11. 1 kinds of network equipments, it is characterised in that include appointing in the claims 6 to 8 Clock board described in one described clock board and the claims 9 or 10.
CN201310260860.4A 2013-06-27 2013-06-27 A kind of method and apparatus of time synchronized Active CN103346873B (en)

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CN109644120B (en) 2016-08-10 2020-10-09 华为技术有限公司 Method and apparatus for time synchronization
CN108737000B (en) * 2017-04-24 2020-01-21 上海诺基亚贝尔股份有限公司 Method and apparatus for clock synchronization
CN107396326A (en) * 2017-08-02 2017-11-24 北京北方烽火科技有限公司 A kind of method and master clock system for generating System Frame Number
WO2020147108A1 (en) * 2019-01-18 2020-07-23 华为技术有限公司 Time synchronization method and apparatus
CN113424466B (en) * 2019-02-15 2023-01-13 华为技术有限公司 Method and device for clock synchronization

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