CN101783725A - Method for outputting synchronous time, device and system thereof - Google Patents
Method for outputting synchronous time, device and system thereof Download PDFInfo
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- CN101783725A CN101783725A CN200910105234A CN200910105234A CN101783725A CN 101783725 A CN101783725 A CN 101783725A CN 200910105234 A CN200910105234 A CN 200910105234A CN 200910105234 A CN200910105234 A CN 200910105234A CN 101783725 A CN101783725 A CN 101783725A
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Abstract
The embodiment of the invention relates to the field of communication transmission, and particularly discloses a method for acquiring synchronous time, a device and a system thereof. The method comprises the following steps: receiving pseusynchronous time information, processing the pseusynchronous time information and obtaining pseusynchronous time T1; acquiring synchronous time information from a synchronous time source, processing the synchronous time source, obtaining synchronous time T2, calculating a time difference value Delta T of the synchronous time T2 and the pseusynchronous time T1 and storing the difference value Delta T; and when failing to acquire synchronous time information from the synchronous time source, correcting the pseusynchronous time T1 with the stored time difference value Delta T, obtaining corrected time T3 and selecting, and outputting the corrected time T3 as synchronous time of equipment needing to synchronize time. The invention solves the problem that in the prior art, the transmission delays of the two-way transmission channel of the transmission network are different so as to cause low accuracy and the like of the synchronous time obtained by operating the network time protocol.
Description
Technical field
The present invention relates to field of communication transmission, relate in particular to and obtain a kind of methods, devices and systems of exporting lock in time.
Background technology
At present, each operator has set up a large amount of SDH (Synchronous Digital Hierachy, SDH (Synchronous Digital Hierarchy)), MSTP (Multi-Service Transmission, multi-service transport platform), SONET (Synchronous Optical Network, Synchronous Optical Network), OTN (Optical TransmissionNetwork, optical transfer network), PTN etc. transmits net, these transmit nets and have born present main amount of communication data, and scale and the scope of application are also in continuing expansion.
Meanwhile, requirement synchronous between the equipment is also just more and more, and the precision of time synchronized is also promoting to the 1us rank.For example, the Voice ﹠ Video synchronous playing during multimedia service transmits; Time slot location, pilot detection etc. need the precise time reference under 3G/4G TDD in the mobile communication (Time Division Duplex, the time division duplex) mode; Some value-added services under FDD (Frequency Division Duplex, the Frequency Division Duplexing (FDD)) mode (for example: the location) also need precise time information; Charging in the communication network, troubleshooting etc. also need more accurate time reference.
At present, the equipment that needs lock in time for BTS (Base Transceiver Station, base transceiver station) etc. provides dual mode is arranged lock in time.Wherein first kind of mode is by transmitting network delivery lock in time, and transmit the important way of lock in time by the transmission network delivery is operation NTP (Network TimeProtocol, NTP (Network Time Protocol)), wherein most important and what generally use is the IEEE1588 agreement.For example, the A transfer equipment that transmits in the net provides lock in time for the BTS that links to each other with the B equipment that transmits in netting by NTP (Network Time Protocol), and its workflow is roughly as follows:
1, the A transfer equipment, sends one subsequently and follows message constantly to the sync message of a NTP (Network Time Protocol) of B transfer equipment transmission at T1, includes the time value that the A transfer equipment sends above-mentioned sync message in this message.
2, the B transfer equipment receives above-mentioned sync message constantly at T2, and obtains corresponding T2 time value constantly from oneself clock, receives again subsequently and follows message, therefrom obtains corresponding T1 time value constantly.
3, the B transfer equipment constantly sends the time-delay request message (Delay_Req Message, time-delay request message) of a NTP (Network Time Protocol) at T3 to the A transfer equipment, and obtains corresponding T3 moment time value from own clock.
4, the A transfer equipment receives above-mentioned time-delay request message constantly at T4, sends the time-delay response message (Delay_Resp Message, time-delay request message) of a NTP (Network Time Protocol) subsequently to the B transfer equipment, contains corresponding T4 time value constantly in this message.
5, the B transfer equipment is after receiving above-mentioned time-delay response message, obtain corresponding T4 time value constantly, utilize the previous T1 time value that obtains simultaneously, T2 time value and T3 time value, by formula T2=T1+Delay+Offset and T4=T3+Delay-Offset, calculate the transmission delay Delay between A transfer equipment and the B transfer equipment, the time offset Offset of the clock of the relative A transfer equipment of the clock of B transfer equipment, the B transfer equipment is according to the clock of transmission delay Delay and time offset Offset adjustment B transfer equipment then, and the clock with the B transfer equipment provides the A transfer equipment synchronous lock in time for BTS again.
It all is symmetrical requiring two Network Transmission time-delay and time offset between the transfer equipment in transmitting net, in case the fluctuation of above-mentioned time-delay changes, will make the accuracy through the lock in time that Network Transmission obtains reduce.And the circuit difference of signal post's process back and forth between two transfer equipments in the reality, so just can not guarantee that two transmission delays on the communication direction are identical, therefore transmit Netcom and cross the bearer network time protocol, for the equipment that needs lock in time such as BTS etc. provides high precision synchronous time difficulty relatively just.
In the prior art, the equipment that needs lock in time for BTS etc. provides the second way of lock in time, be exactly the GPS of receiver reception via satellite (Global Positioning System, global positioning system), GPS (Galileo Positioning System, the Galileo navigation system), GLONASS (GLObalNAvigation Satellite System, GLONASS (Global Navigation Satellite System)), big-dipper satellite system etc. has the lock in time that the system of time service function provides, and then will offer the equipment that BTS etc. needs lock in time this lock in time.Because satellite receiver is when the lock in time that the reception said system provides, be subjected to the influence of factors such as weather, environment easily, cause lock in time of receiving unavailable, general lock in time of all adopting two satellite receiver to receive the said system transmission, the backup of realization time, when in case one of them satellite receiver is unavailable, just enable the lock in time that said system that the another one satellite receiver receives sends immediately, the equipment that continuing as BTS etc. needs lock in time continues to provide lock in time.
The inventor is in research process, find that there is following problem at least in first kind of mode of the prior art: it all is symmetrical transmitting and requiring two Network Transmission time-delay and time offset between the transfer equipment in the net, in case the fluctuation of above-mentioned time-delay changes, will make accuracy reduce through the lock in time that Network Transmission obtains.And the circuit difference of signal post's process back and forth between two transfer equipments in the reality, so just can not guarantee that two transmission delays on the communication direction are identical, therefore transmit Netcom and cross the bearer network time protocol, for the equipment that needs lock in time such as BTS etc. provides high precision synchronous time difficulty relatively just.And the second way is two satellite receiver of equipment configuration that same BTS etc. needs lock in time, and then cost is too high.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of methods, devices and systems of exporting lock in time, overcomes the lock in time that pinpoint accuracy can not be provided in the prior art, can not realize the technical problem of time backup cheaply again.
The embodiment of the invention provides a kind of method of exporting lock in time, comprising:
Receive puppet information lock in time, and handle described puppet information lock in time, obtain puppet T1 lock in time;
From lock in time the source obtain and handle information lock in time, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
When from described lock in time the source obtain information when failure lock in time, revise described pseudo-lock in time of T1 with the described difference DELTA T that preserves, obtain correction time T3, select the described correction time T3 of output as the lock in time that needs the equipment of lock in time.
The embodiment of the invention also provides a kind of device of exporting lock in time, and this device comprises:
The time signal interface is used to receive puppet information lock in time, and handles described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, be used for from lock in time the source obtain information lock in time, and handle described lock in time of information, obtain T2 lock in time;
The time difference computing module, be used to calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
The time correcting module is used for described difference DELTA T described puppet T1 lock in time being revised when described lock in time, acquisition module obtained lock in time information failure, obtains correction time T3;
The selection of time module is used for selecting the described correction time T3 of output as the lock in time that needs the equipment of lock in time when described lock in time, acquisition module obtained lock in time information failure.
The embodiment of the invention also provides a kind of method based on output lock in time of transmitting net, comprising:
First transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transmission net, obtain the standard time information after adaptive, and in described transmission net, transmit described standard time information after adaptive;
Second transfer equipment receives described standard time information after adaptive, and described standard time information after adaptive is gone adaptive, output pseudo-lock in time of information, and with described pseudo-lock in time information send to the equipment side that needs information lock in time;
At the described equipment side that needs lock in time, receive described puppet information lock in time, and handle described puppet information lock in time, obtain puppet T1 lock in time; Processing is from information lock in time that lock in time, the source obtained, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T, when from described lock in time the source obtain information when failure lock in time, revise described puppet T1 lock in time with the described difference DELTA T that preserves, obtain correction time T3, select the described correction time T3 of output as the lock in time that needs the equipment of lock in time.
The embodiment of the invention also provides a kind of system based on output lock in time of transmitting net, comprising:
The device of first transfer equipment, second transfer equipment and output lock in time, described first transfer equipment and described second transfer equipment are arranged in described transmission net;
Described first transfer equipment, be used for obtaining standard time information from time server, and described standard time information is fitted to the transmission channel of described transmission net, obtain the standard time information after adaptive, and in described transmission net, transmit described standard time information after adaptive;
Described second transfer equipment is used to receive described standard time information after adaptive, and described standard time information after adaptive is gone adaptive, output pseudo-lock in time of information;
The described device of exporting lock in time is used for described puppet information lock in time being handled the required lock in time of equipment that output needs lock in time.
Among the present invention embodiment by from lock in time the source obtain lock in time, and utilize the difference between lock in time and pseudo-lock in time that puppet is revised lock in time, be exactly a lock in time that accuracy is very high revised pseudo-lock in time, overcome the transmission delay difference that transmits the transmitted in both directions passage of net in the prior art, caused the accuracy not high problem of the lock in time that the operational network time protocol obtains; Utilize the difference of preserving to revising the pseudo-lock in time that sends from the transmission network side simultaneously, the pseudo-lock in time that obtains revising, the pseudo-lock in time of this correction be in fact again to lock in time module obtain and handle the backup of the lock in time that obtains after information lock in time, this time mode of backup is with low cost.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Fig. 1 shows a kind of method flow diagram of exporting lock in time of the embodiment of the invention one;
Fig. 2 shows a kind of structure chart of exporting the device of lock in time of the embodiment of the invention two;
Fig. 3 shows the embodiment of the invention three a kind of method flow diagram based on output lock in time of transmitting net;
Fig. 4 shows the embodiment of the invention four a kind of system construction drawing based on output lock in time of transmitting net;
Fig. 5 shows the structure chart of the 2nd SDH transfer equipment in the embodiment of the invention four.
Embodiment
Understand and realization the present invention the existing embodiments of the invention of describing in conjunction with the accompanying drawings for the ease of persons skilled in the art.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
Pseudo-lock in time of information in the following examples can transmit the net side to be provided, certain transfer equipment has obtained standard time information (standard time information with actual time information conform to) from time server in transmitting net, this standard time information is transferred to another transfer equipment in transmitting net need experience a period of time, be exactly transmission delay during this period of time, because the existence of transmission delay is arranged, transmit the temporal information that temporal information is exactly with actual time, information was not inconsistent that the last transfer equipment that receives this standard time information obtains in the net, be referred to as puppet information lock in time, this pairing time of puppet information lock in time is exactly pseudo-lock in time.
The embodiment of the invention one, a kind of flow chart of the method for exporting lock in time as shown in Figure 1, this method comprises:
Receive puppet information lock in time, and handle this puppet information lock in time, obtain puppet T1 lock in time;
From lock in time the source obtain information lock in time, handle this of information lock in time, obtain T2 lock in time, calculate lock in time T2 with the time difference Δ T of pseudo-lock in time of T1, and preserve this difference DELTA T;
When from lock in time the source obtain information when failure lock in time, with the above-mentioned time difference Δ T that preserves to pseudo-lock in time T1 revise, obtain correction time T3, select output correction time T3 conduct to need the lock in time of the equipment of lock in time.
Be understandable that, when obtaining lock in time from the source lock in time during information, the time difference Δ T that also can utilize aforementioned calculation to obtain revises puppet T1 lock in time, obtain revised puppet T1 lock in time, this moment is because T2 lock in time is available, general output T2 lock in time that preferentially selects also can select to export the lock in time that revised pseudo-T1 conduct lock in time needs the equipment of lock in time as the lock in time that needs the equipment of lock in time.
In the present embodiment, lock in time the source, can be GPS (Global Positioning System, global positioning system), GPS (Galileo Positioning System, the Galileo navigation system), the one or more systems in GLONASS (GLObal NAvigation Satellite System, GLONASS (Global Navigation Satellite System)), the big-dipper satellite system.These systems all have the time service function.When these systems with time service function break down or the weather environment very severe, or the land is used for will causing occurring obtaining the situation of information failure lock in time when these systems with time service function obtain the equipment of information lock in time or device and break down.
Present embodiment can be effectively to revising pseudo-lock in time, and then obtain accurate lock in time, and the method for present embodiment also continues so that break down in the source in lock in time revising pseudo-lock in time, and then obtain accurate lock in time, continuing as needs the equipment of lock in time that be provided lock in time, also just realized the backup to the lock in time that lock in time, the source provided, this time backup method is with low cost, does not need expensive satellite receiver.
A kind of structure chart of exporting the device of lock in time of the embodiment of the invention two, as shown in Figure 2, this device comprises:
Time signal interface, lock in time acquisition module, time difference computing module, time correcting module and selection of time module.
The time signal interface is used to receive puppet information lock in time, and handles this puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, be used for from lock in time the source obtain information lock in time, handle this information lock in time and obtain T2 lock in time;
The time difference computing module, be used to calculate lock in time difference T2 with the difference DELTA T of pseudo-lock in time of T1, and preserve this difference DELTA T;
The time correcting module, be used for lock in time acquisition module obtain information when failure lock in time, with the above-mentioned difference DELTA T that preserves puppet T1 lock in time is revised, obtain correction time T3;
The selection of time module, be used for lock in time acquisition module obtain information when failure lock in time, select output correction time T3 as the lock in time that needs the equipment of lock in time.
Be understandable that, lock in time acquisition module can get access to lock in time during information, the time correcting module also use difference that the time difference module calculates to pseudo-lock in time T1 revise, obtain revised puppet T1 lock in time, and should be input to the selection of time module by revised puppet T1 correcting module lock in time, and lock in time, T2 also was input to the selection of time module, the selection of time module generally can preferentially select output T2 lock in time as the lock in time that needs equipment lock in time, but also can select to export revised puppet T1 lock in time, as the lock in time that needs equipment lock in time.
Among the embodiment three a kind of flow chart of the method based on output lock in time of transmitting net as shown in Figure 3, this method comprises:
First transfer equipment obtains standard time information from time server, and should standard time information be fitted to the transmission channel that transmits net, obtains the standard time information after adaptive, and transmits this standard time information after adaptive in above-mentioned transmission net;
Second transfer equipment receives the standard time information after adaptive, and the standard time information after adaptive is gone adaptive, output pseudo-lock in time of information, and should puppet information lock in time send to the equipment side that needs lock in time;
Need the equipment side of lock in time, above-mentioned puppet information lock in time is being handled, exporting lock in time.Needing the equipment side of lock in time, to above-mentioned pseudo-lock in time information handle, output can be specially lock in time: pseudo-lock in time of the information that receives that second transfer equipment sends, and handle this information lock in time and obtain pseudo-lock in time of T1; Receive and handle, obtain T2 lock in time from information lock in time that lock in time, the source obtained, the time difference Δ T of calculating T2 lock in time and puppet T1 lock in time, and preserve this difference DELTA T; When from lock in time the source obtain information when failure lock in time, with the above-mentioned time difference Δ T that preserves to pseudo-lock in time T1 revise, obtain correction time T3, select correction time T3 conduct to need the lock in time of the equipment of lock in time.
First transfer equipment obtains standard time information from time server, and standard time information is fitted to the transmission channel that transmits net, obtain the standard time information after adaptive, and in above-mentioned transmission net, transmit after the step of this standard time information after adaptive, further comprise:
Transfer equipment between first transfer equipment and second transfer equipment with above-mentioned standard time information transparent transmission after adaptive to described second transfer equipment.
Further, output also comprises before the information pseudo-lock in time:
From transmit net, extract line clock, and with the output clock of this line clock as output pseudo-lock in time of information.
Be understandable that, in transmitting net, may also have a lot of transfer equipments between first transfer equipment and second transfer equipment, these transfer equipments are transparent transmission to the temporal information after adaptive, be each transfer equipment with a last transfer equipment transmit above-mentioned adaptive after temporal information do not make any change, transmit toward next transfer equipment, up to being sent to above-mentioned second transfer equipment.
In the present embodiment, which can be used as lock in time the source specifically referring to be among the embodiment one about the description in source lock in time, the situation of obtaining information failure lock in time is specifically referring to the associated description among the embodiment one.
Transmission net in the present embodiment can be that SDH transmits net, and SONET transmits net, and MSTP transmits net, and PTN transmits net, and OTN transmits net etc.Transmitting net with SDH is example, a SDH equipment, and the 2nd SDH equipment all is arranged in same SDH net.After the one SDH equipment obtains standard time information from time server, should the standard time information mapping arrive VC (Virtual Channel, Virtual Channel), the standard time information after obtaining shining upon transmits transmission in the net with the standard time information after the mapping at this SDH.And after the standard time information of the 2nd SDH equipment after receiving mapping, tributary card in the 2nd SDH equipment is separated mapping to it and is handled, obtain payload (in fact the payload here is exactly the temporal information that a SDH equipment obtains), can be with these payloads as pseudo-information output lock in time.Need to prove that the standard time information of obtaining owing to a SDH equipment can not change when transmitting between SDH equipment and the 2nd SDH equipment, need spended time and transmit these information, therefore the time that these temporal informations characterized just lags behind the real time, be not and real time synchronized, so these temporal informations are referred to as puppet information lock in time.Be understandable that puppet information lock in time just is meant the temporal information of asynchronous with actual time (generally being to lag behind than actual time the time that pseudo-lock in time, information characterized, also may be leading), puppet just is meant and nonsynchronous time of actual time lock in time.Transmit in the net at SDH, transmission channel is meant Virtual Channel.
The tributary card of the 2nd SDH equipment is being separated mapping to the temporal information after the mapping, separate in the process of mapping at this, relate to the pointer adjustment, the phase place that causes separating the payload that mapping obtains may change (in fact the payload here is exactly the temporal information that a SDH equipment obtains), and then causes the temporal information that receives and the error of real temporal information further to increase.For eliminating the influence that this pointer adjustment brings, can transmit the net from SDH and extract line clock, the output clock of this line clock as tributary card output payload.After adopting this method, can eliminate the variation of the tributary card payload phase place that the pointer adjustment brings in separating mapping process, so reduce pseudo-lock in time information and actual time information error.Transmit in the net at SDH, in fact the standard time information mapping is exactly one to the process of Virtual Channel standard time information is fitted to the process of Virtual Channel, and the temporal information that the temporal information after will shining upon will be separated after mapping process just will shine upon is gone adaptive process.
The transfer equipment that transmits in net and the MSTP transmission net at SONET can extract line clock equally from circuit, and with the output clock of line clock as output pseudo-lock in time of information.But the transfer equipment that OTN transmits in net or the PTN transmission net just can't extract line clock from circuit, is the asynchronous working mode because OTN transmits the working method of net and PTN transmission net, can't extract line clock.
In the present embodiment, first transfer equipment will be from standard time information folk prescription that time server obtains to passing to second transfer equipment, export puppet information lock in time after the processing that second equipment process is relevant then, revise the pseudo-lock in time that this puppet information lock in time is characterized then, obtain the correction time, at last, the equipment that needs lock in time is exported and offered to this correction time.This scheme makes that transmitting net does not need to move complicated NTP (Network Time Protocol), as the IEEE1588 agreement, also avoided accuracy reduction, also still can provide lock in time simultaneously for the equipment that needs lock in time because of the lock in time that obtains of transmitting the asymmetric operational network time protocol that causes of net transmitted in both directions channel transfer time-delay.Can offer a plurality of equipment that need lock in time the lock in time of exporting in the present embodiment, that is to say temporal information that transmission channel transmits in the shared transmission net of these a plurality of equipment, improve transmitting the utilance of transmission channel in the net.
Among the embodiment four a kind of system construction drawing based on output lock in time of transmitting net as shown in Figure 4, this system comprises:
The device of first transfer equipment, second transfer equipment and output lock in time, first transfer equipment and second transfer equipment are arranged in same transmission net;
First transfer equipment, be used for obtaining standard time information from time server, and should standard time information be fitted to the transmission channel that transmits net, obtain the standard time information after adaptive, and transmit will this information lock in time after adaptive in above-mentioned transmission net;
Second transfer equipment is used to receive above-mentioned standard time information after adaptive, and the standard time information after adaptive is gone adaptive, output pseudo-lock in time of information;
The device of output lock in time comprises: time signal interface, lock in time receiver module, time difference computing module, time correcting module and selection of time module;
The time signal interface is used to receive pseudo-lock in time of the information of second transfer equipment output, and handles this puppet information lock in time, obtains pseudo-lock in time of T1;
Lock in time acquisition module, be used for from lock in time the source obtain information lock in time, handle this information lock in time and obtain T2 lock in time;
The time difference computing module, be used to calculate lock in time difference T2 with the difference DELTA T of pseudo-lock in time of T1, and preserve this difference DELTA T;
The time correcting module, be used for lock in time acquisition module obtain information when failure lock in time, with the above-mentioned difference DELTA T that preserves puppet T1 lock in time is revised, obtain correction time T3;
The selection of time module, be used for lock in time acquisition module obtain information when failure lock in time, select correction time T3 as the lock in time that needs the equipment of lock in time.
Be understandable that, lock in time acquisition module can obtain lock in time during information, the time correcting module also use difference that the time difference module calculates to pseudo-lock in time T1 revise, obtain revised puppet T1 lock in time, and should be input to the selection of time module by revised puppet T1 correcting module lock in time, and lock in time, T2 also was input to the selection of time module, the general meeting of selection of time module is preferential selects output T2 lock in time conduct need the lock in time of equipment lock in time, but also can export revised puppet T1 lock in time.
Further, system in the present embodiment comprises one the 3rd transfer equipment at least, in the transmission net of the 3rd transfer equipment between described first transfer equipment and second transfer equipment, described the 3rd equipment is used for the standard time information after adaptive is carried out transparent transmission to the second transfer equipment.The transparent transmission here be meant the 3rd transfer equipment with last transfer equipment transmit adaptive after standard time information be not sent to next transfer equipment until being sent to second transfer equipment with not making any change.
In the system of present embodiment, second transfer equipment can also comprise clock board, and this clock board obtains line clock from transmit net, and with the output clock of this line clock as output pseudo-lock in time of information.For example, transmit based on SDH in the system that obtains lock in time of net, the 2nd SDH transfer equipment just can comprise clock board.
Present embodiment also discloses the structure of the 2nd SDH transfer equipment, and as shown in Figure 5, the 2nd SDH transfer equipment comprises: the east orientation wiring board, and western to wiring board, cross board, tributary card.One end of east orientation wiring board links to each other with the transmission net in the 2nd SDH transfer equipment east side, and the other end is connected on the cross board.The west links to each other with the transmission net in the 2nd SDH transfer equipment west side to an end of wiring board, and the other end is connected on the cross board.Tributary card is used for from cross board branch service up and down.All there is the function of extracting line clock in east orientation wiring board and west in wiring board, clock board is selected the output clock of the line clock of one of them wiring board extraction as tributary card outgoing traffic (in the present embodiment, business is meant puppet information lock in time).Tributary card is exported clock according to this, output pseudo-lock in time of information, can eliminate tributary card in separating mapping process the pointer adjustment to the influence of pseudo-lock in time of information, specifically referring among the embodiment three about adopting the correlation analysis of line clock as the output clock of output pseudo-lock in time of information.
Do not need the operational network time protocol owing to transmit net in the present embodiment, so transfer equipment is realized simple.When a plurality of equipment that need lock in time need lock in time, get final product on the device lock in time that only needs these a plurality of equipment that need lock in time are connected in the present embodiment system, a transmission channel of the transmission net in the system of this explanation present embodiment can improve the utilance to single transmission channel for a plurality of device transmission temporal informations.And the temporal information that first transfer equipment in the system of present embodiment obtains is that second transfer equipment is given in one-way transmission, only take a transmission channel, and prior art operational network time protocol carries out passing time, two transmission channels have then been taken, first transfer equipment need take a transmission channel when second transfer equipment transmits message, second transfer equipment needs to take a transmission channel again when first transfer equipment transmits message, present embodiment can be saved transmission channel, reduces transmission time information to transmitting the occupancy of net loan.Present embodiment also has the effect of time backup, for example: when from lock in time the source can't obtain lock in time during information, after can handling the temporal information that transmits the net transmission, for the equipment that needs lock in time continues to provide lock in time, when can obtaining lock in time from the source lock in time during information, if transmitting net breaks down can't passing time information the time, after information lock in time that the source obtains from lock in time can also being handled, for the equipment that needs lock in time continues to provide lock in time.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. the method based on output lock in time of transmitting net is characterized in that, comprising:
First transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transmission net, obtain the standard time information after adaptive, and in described transmission net, transmit described standard time information after adaptive;
Second transfer equipment receives described standard time information after adaptive, and described standard time information after adaptive is gone adaptive, output pseudo-lock in time of information, and with described pseudo-lock in time information send to the equipment side that needs information lock in time;
At the described equipment side that needs lock in time, receive described puppet information lock in time, and handle described puppet information lock in time, obtain puppet T1 lock in time; Processing is from information lock in time that lock in time, the source obtained, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T, when from described lock in time the source obtain information when failure lock in time, revise described puppet T1 lock in time with the described difference DELTA T that preserves, obtain correction time T3, select the described correction time T3 of output as the lock in time that needs the equipment of lock in time.
2. the method for claim 1, it is characterized in that, described first transfer equipment obtains standard time information from time server, and described standard time information is fitted to the transmission channel of described transmission net, obtain the standard time information after adaptive, and in described transmission net, transmit after the described standard time information step after adaptive, further comprise:
Transfer equipment between described first transfer equipment and described second transfer equipment with described standard time information transparent transmission after adaptive to described second transfer equipment.
3. method as claimed in claim 1 or 2 is characterized in that, described output further comprises before the information pseudo-lock in time: from described transmission net, extract line clock, and with the output clock of described line clock as output pseudo-lock in time of information.
4. the system based on output lock in time of transmitting net is characterized in that, comprising:
The device of first transfer equipment, second transfer equipment and output lock in time, described first transfer equipment and described second transfer equipment are arranged in described transmission net;
Described first transfer equipment, be used for obtaining standard time information from time server, and described standard time information is fitted to the transmission channel of described transmission net, obtain the standard time information after adaptive, and in described transmission net, transmit described standard time information after adaptive;
Described second transfer equipment is used to receive described standard time information after adaptive, and described standard time information after adaptive is gone adaptive, output pseudo-lock in time of information;
The described device of exporting lock in time is used for described puppet information lock in time being handled the required lock in time of equipment that output needs lock in time.
5. system as claimed in claim 4 is characterized in that, the described device of exporting lock in time comprises:
The time signal interface is used to receive described puppet information lock in time, and handles described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, be used for from lock in time the source obtain information lock in time, and handle described lock in time of information, obtain T2 lock in time;
The time difference computing module, be used to calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
The time correcting module is used for described difference DELTA T described puppet T1 lock in time being revised when described lock in time, acquisition module obtained lock in time information failure, obtains correction time T3;
The selection of time module is used for selecting the described correction time T3 of output as the lock in time that needs the equipment of lock in time when described lock in time, acquisition module obtained lock in time information failure.
6. system as claimed in claim 4, it is characterized in that, described system further comprises at least one the 3rd transfer equipment, in the transmission net of described the 3rd transfer equipment between described first transfer equipment and second transfer equipment, described the 3rd equipment is used for described standard time information transparent transmission after adaptive to described second transfer equipment.
7. as the described system of each claim of claim 4 to 6, it is characterized in that, described second transfer equipment comprises clock board, is used for obtaining line clock from described transmission network, and with the output clock of described line clock as the described puppet of output information lock in time.
8. a device of exporting lock in time is characterized in that, described device comprises:
The time signal interface is used to receive puppet information lock in time, and handles described puppet information lock in time, obtains puppet T1 lock in time;
Lock in time acquisition module, be used for from lock in time the source obtain information lock in time, and handle described lock in time of information, obtain T2 lock in time;
The time difference computing module, be used to calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
The time correcting module is used for described difference DELTA T described puppet T1 lock in time being revised when described lock in time, acquisition module obtained lock in time information failure, obtains correction time T3;
The selection of time module is used for selecting the described correction time T3 of output as the lock in time that needs the equipment of lock in time when described lock in time, acquisition module obtained lock in time information failure.
9. a method of exporting lock in time is characterized in that, comprising:
Receive puppet information lock in time, and handle described puppet information lock in time, obtain puppet T1 lock in time;
From lock in time the source obtain and handle information lock in time, obtain T2 lock in time, calculate described lock in time T2 and described pseudo-lock in time T1 difference DELTA T, and preserve described difference DELTA T;
When from described lock in time the source obtain information when failure lock in time, revise described pseudo-lock in time of T1 with the described difference DELTA T that preserves, obtain correction time T3, select the described correction time T3 of output as the lock in time that needs the equipment of lock in time.
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