CN1716949A - Group network realizing method for time synchronous network - Google Patents
Group network realizing method for time synchronous network Download PDFInfo
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- CN1716949A CN1716949A CN 200410062412 CN200410062412A CN1716949A CN 1716949 A CN1716949 A CN 1716949A CN 200410062412 CN200410062412 CN 200410062412 CN 200410062412 A CN200410062412 A CN 200410062412A CN 1716949 A CN1716949 A CN 1716949A
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Abstract
This invention relates to networking method for time synchronous networks including: networking according to the reference time ranks of time synchronous node equipments to connect them rank by rank physically from the first rank node to N, every node receives the time synchronous interface protocol time frames sent by the last node and the next node device, said interface protocol time frame continues to use the IRIG standard time synchronous interface protocol and utilize year time and day time provided by time information segment and utilize the transmission time delay to regulate and carryout time synchronization based on the rank to provide local clock. Said time frame sets a leap second mark segment and a reference time rank information segment in the 27 effective bits control function sets of the IRIG standard time synchronous interface protocol to prompt the happening of leap seconds and designs networking time rank synchronous network to be compatible with the standard IRIG time interface network.
Description
Technical field
The present invention relates to the Time synchronization technique field, relate to utilize a kind of time standard interface-IRIG (Inter Range Instrumention Group) time synchronized interface protocol to realize the method for Time Synchronization Network networking or rather.
Background technology
Because the difference of atomic time and earth rotation, for a long time, humanly generally adopt the macroscopic motion cycle of celestial body as the standard of metering time, traditional astronomical time standard that Here it is.The basis of astronomical time is: (1) earth rotation; (2) the circumsolar orbital motion of the earth; (3) moon is around the orbital motion of the earth.After the sixties in this century, the astronomical time standard is replaced by the former substandard based on the inner atom microscopic motion of material, and Here it is the atomic time.Atomic time is with second, rather than is basic time unit with the day, the second of General Conference of Weights and Measures regulation atomic time is long be between two hyperfine energy levels of caesium-133 atomic ground state under zero magnetic field duration in 9192631770 cycles of transition radiation.The 13 CIPM's decision in 1967 is defined as international system of units chronomere to the above-mentioned atom second of time that realizes on the sea level.The atomic time starting point fixes on 0 o'clock on the 1st January (UT) in 1958.
Atom second of time length is quite accurately, but its show the time be engraved in the daily life not what practical significance, and with closely bound up time of people's daily life be the universal time that obtains by astronomical observation.Universal time is to be the time measurement system of standard with the earth rotation movement, the angle of earth rotation can with local meridian with respect to celestial sphere (in the astronomy for ease of the position and the motion of research celestial body, with celestial sphere be assumed to be one with the earth's core be the center, infinitely-great, the earth-circling sphere of radius) on the motion of basic reference point measure.In order to measure earth rotation, people have chosen two basic reference points on celestial sphere: in the first point of Aries (or claiming sub-to-point) and mean sun, the time of Que Dinging is called sidereal time and mean solar time thus.
With respect to the universal time based on earth rotation, the atomic time is uniform time measurement system, and measuring intervals of TIME is had very important meaning, but universal time has reflected the position of the earth in the space, and this also needs.For taking into account this two kinds of needs, introduced the Coordinated Universal Time(UTC) (UTC) system.UTC is still a kind of atomic time in itself because it second calipers surely will be with atom second of time appearance etc., just the time engrave, by manual intervention, as far as possible near universal time.
The accuracy of International Atomic Time is to count nanosecond every day, and the accuracy of universal time is a number millisecond every day.For this situation, the Coordinated Universal Time(UTC) is marked in 1972 when conduct is compromise and emerges.Can surpass 0.9 second for guaranteeing that Coordinated Universal Time(UTC) and universal time do not differ, when meeting is in the Coordinated Universal Time(UTC) under the situation that needs are arranged, add plus or minus leap second.These technical measures just are called leap second (or jump second), the positive leap second of increasing by 1 second and be called (or positive jump second); The negative leap second of removing 1 second and be called (or negative leap second).Therefore understand the some integers of the appearance difference of second between Coordinated Universal Time(UTC) and the International Atomic Time.
The International Earth Rotation affairs central office that is positioned at Paris is responsible for decision and when adds leap second.The first-selected date of leap second is annual December 31 and June 30, or March 31 and September 30.If the positive leap second, then behind 23: 59: 60 of same day leap second, to insert 1 second, the sequential after the insertion is: ... 58 seconds, 59 seconds, 60 seconds, 0 second ..., this expression earth rotation is slow, and this day is not 86400 seconds, but 86401 seconds; If the negative leap second, then the 59th second in 23: 59 same day of leap second to be removed, the sequential after removing is: ... 57 seconds, 58 seconds, 0 second ... this day is 86399 seconds.
Existing time synchronized interface mainly contains two kinds of IRIG and network timing agreements (NTP:Network TimeProtocol).
NTP is based on the time synchronized interface protocol of IP network, and perfect protocol specification is arranged, and it is no problem being used to set up time grade synchronizing network.But because therefore the isoparametric uncertainty of network delay of IP network is not suitable as main networking means in other Time Synchronization Network of carrier-class.
IRIG has the high advantage of time service precision as a kind of time standard interface, is widely used in the time synchronized field.Draft interface protocol, latest edition 200-95 up till now since in October, 1956 by the TCWG (telecommunications operations group) of IRIG.Determining the IRIG interface standard, is in order to determine the timing code of a standard between the zone of difference test and image data and laboratory at first, is convenient to analyze accurately the sequential that data and recording events take place.Because different to record data accuracy and resolution requirement, even the media difference of record data, produced the timing code form of different IRIG.IRIG timing code form commonly used now is IRIGB000 and IRIGB120.
The format description of IRIG timing code the definition of the definition of speed, representation, carrier wave resolution and a sign indicating number type represent, wherein the definition of speed comprises: 10,000PPS (10000 pulses of per second), 1,000PPS (1000 pulses of per second), 100PPS (100 pulses of per second), 10PPS (10 pulses of per second), 1PPS (1 pulse of per second), and 1PPM (pulse of per minute); The representation definition comprises: DC level displacement (DCLS:DC Level Shift), pulsewidth coding (width coded) and sinusoidal carrier amplitude modulation(PAM) (Sine Wave carrier, amplitude modulated); Carrier wave resolution comprises: carrierfree (No carrier), 100hz 10ms resolution (100Hz/10millisecond resolution), 1khz 1ms resolution (1kHz/1millisecond resolution), 10khz 100us resolution (10kHz/100microsecond resolution) and 100khz 10us resolution (100kHz/10microsecond resolution); The sign indicating number type is represented to comprise: BCD (8421 yards), CF (control frame), SBS (straight binary sign indicating number); BCD (8421 yards), CF (control frame); BCD (8421 yards); BCD (8421 yards), SBS (straight binary sign indicating number).
A complete IRTGB120 time frame format, its frame period is 1S, the sign indicating number source is 10ms at interval.Every frame begins (high level, duration 8ms) with P0 and Pr witness marker, is that the P1 section is to the P9 section then.It between Pr to P5 the year (Time of year) of binary-coded decimal, the expression current time comprises the sky information (significance bit is 10) between hour information (significance bit 6), P3 and the P5 between branch information (effectively being 7), P2 and the P3 between information second (significance bit 7), P1 and the P2 between Pr and P1 with respect to the fate and the Hour Minute Second number in 0: 0: 0 on the 1st January then.Be the controlled function group of 27 significance bits between P5 and P8, can write any binary information.Be sky time (the Time of day) information of the SBC sign indicating number form of 17 significance bits between P8 and next P0, represent current second number in a day.
The temporal information that meets the IRIG form can utilize coaxial cable or twisted-pair feeder even process transmission equipment to be delivered to far-end, and its transmission feature is the special line transmission, the route relative fixed, and propagation delay time can obtain by estimating or surveying, and is compensated.So IRIG is more suitable for setting up the Time Synchronization Network of cross-region than NTP.
But the IRIG of standard will experience difficulties when setting up healthy and strong time grade synchronizing network: at first be not carry the network information, and in the face of the network configuration that becomes increasingly complex with for the consideration of fail safe, the user needs the details of monitoring period synchronizing network, understand structure, the time synchronized of Time Synchronization Network the path, prevent the time synchronized loop; Next is not carry leap second information, owing to there is not obviously to point out the existence of leap second, just may go wrong in some applications, the time interval of a common receiving equipment alignment time may be longer, in the time interval of twice calibration, if the variation of leap second takes place, just might lose the time frame that has leap second information, like this take place to change to leap second time calibration next time during this period of time in, the time of receiving equipment is just inaccurate, beyond thought problem will occur in the accurate application of needs strictness and UTC time synchronized; Moreover owing to there is not the function of data check, in the application of some time-sensitives, such as network security, electronic transaction etc., may receive owing to disturb the wrong time that causes, this mistake is enough to cause the collapse of whole system.These all are the indeterminable problems of standard IR IG.
Therefore, improve healthy and strong time synchronization network, particularly set up a time grade Synchronization Network if utilize standard IR IG and DCLS time interface also can't set up.
Summary of the invention
The objective of the invention is to design a kind of networking implementation method of Time Synchronization Network.By a time synchronized interface protocol with standard IR IG protocol-compliant is provided, and provides and utilize this agreement to set up the method for improving healthy and strong time grade synchronizing network.Be used to solve the problem of utilizing standard IR IG and DCLS time interface can't set up perfect time grade Synchronization Network.The problem that leap second inserts and error code causes is avoided in the generation that the time grade Synchronization Network of utilizing the inventive method to set up can be stopped timing loop.
The technical scheme that realizes the object of the invention is: a kind of networking implementation method of Time Synchronization Network is characterized in that comprising:
Each time synchronization node equipment down carries out physical connection since the 1st grade by grade by its reference time grade in Time Synchronization Network;
Since the downward transmitting time sync cap of the 1st grade time synchronization node equipment agreement time frame, each grade time synchronization node equipment after the 1st grade is at the time synchronized interface protocol time frame that receives grade time synchronization node equipment output on it on its IRIG time synchronized reference source input interface, simultaneously on its IRIG time synchronized output interface to its next grade time synchronization node equipment output time sync cap agreement time frame, until the time synchronization node equipment of the lowest class;
In described time synchronized interface protocol time frame, reference time class information section is set, the reference time grade of synchronization node equipment writing time in Time Synchronization Network, time synchronization node equipment through n grade receives step by step and sends, wherein the time synchronization node equipment of each grade is adjusted the reference time grade of this node according to the reference time grade that receives, and this adjusted reference time grade of transmission, reference time grade as its next grade time synchronization node equipment, n=1,, N;
In described time synchronized interface protocol time frame, the temporal information section is set, time synchronization node equipment through n grade receives step by step and sends, reference time of receiving with the propagation delay time adjustment of the time synchronization node equipment of each grade wherein, be used to upgrade in the time of this time synchronization node equipment and a grade reference time loses thereon time and continue to safeguard this time synchronization node equipment output time information, simultaneously with time of this node reference time source as its next grade time synchronization node equipment, n=1,, N;
In described time synchronized interface protocol time frame, leap second flag information section is set, the leap second that identifies the same day is adjusted mode, time synchronization node equipment by n grade receives and transmits transmission step by step, the unified output time information of adjusting node of the time synchronization node equipment utilization leap second flag information of each grade.
Also be included in manufacturer's coding section that time synchronization node equipment is set in the described time synchronized interface protocol time frame, time synchronization node equipment by n grade receives step by step and sends, and wherein the time synchronization node equipment of each grade writes manufacturer's coded message of self grade time synchronization node equipment in this manufacturer's coding section and sends.
Also be included in configuration is undertaken by byte all effective information bits in the time frame in the described time synchronized interface protocol time frame even parity check and message segment, time synchronization node equipment by n grade receives step by step and sends, the time frame that receives with verification in the time of reception frame and information checking of the time synchronization node equipment of each grade wherein, and in this message segment, write even parity check that all effective information bits in the transmitting time frame undertake by byte and.
When the time frame check results of the verification in the time of reception frame and information and reception was inconsistent, this time synchronization node equipment was abandoned this time synchronized interface protocol time frame.
The reference time that the time synchronization node equipment of described each grade receives with the propagation delay time adjustment, comprise: the time reference source of synchronization node equipment has one when above in input time, the time reference source that the grade numerical value that reference time grade section provides in each input of this time synchronization node choice of equipment is minimum is imported as the main time reference source of this node, again according to this main time reference source input, with propagation delay time adjustment temporal information that receives and the time that obtains this node.
Described the 1st grade time synchronization node equipment, its time reference synchronization source is input as the time reference source of global positioning system, and the time parameter of the 1st grade time synchronization node equipment is determined by this reference source.
The time synchronization node equipment of described each grade is adjusted the reference time grade of self according to the reference time grade that receives, comprise: when the IRIG of time synchronization node equipment time synchronized reference source input interface had the time reference source of global positioning system, the numerical value of the reference time class information section in the time synchronized interface protocol time frame of this time synchronization node equipment output was fixed as the highest 1 grade.
The time synchronization node equipment of described each grade is adjusted the reference time grade of self according to the reference time grade that receives, the time of this node also is set according to the reference time grade of this node, comprise: when time synchronization node equipment is not the time synchronized interface protocol without any the IRIG timing code of time reference source input or input, the time of giving tacit consent to this node is produced by local internal clocking, when the needs tracking was not the exterior I RIG timing code of time synchronized interface protocol, the numerical value of the reference time grade section of this time synchronization node output was the default value that time synchronized center webmaster is provided with.
The time synchronization node equipment of described each grade is adjusted the reference time grade of self according to the reference time grade that receives, comprise: import in the time reference source that time synchronization node equipment has except that global positioning system time reference source, and the IRIG timing code of input is when being the time synchronized interface protocol, and this time synchronization node equipment adds the numerical value of reference time grade section in the time synchronized interface protocol time frame that receives 1, reduces after the grade reference time grade numerical value as this time synchronization node equipment automatically.
The time synchronization node equipment of described each grade is adjusted the reference time grade of self according to the reference time grade that receives, the time of this node also is set according to the reference time grade of this node, comprise: when the numerical value of reference time grade section in the time synchronized interface protocol time frame that time synchronization node equipment receives is N, indicate no available reference source, the numerical value of reference time grade section is 0 in the time synchronized interface protocol time frame that this time synchronization node equipment sends, and the time of this node is produced by local internal clocking.
The time synchronization node equipment of described each grade is adjusted the reference time grade of self according to the reference time grade that receives, the time of this node also is set according to the reference time grade of this node, comprise: when the numerical value of reference time grade section in the time synchronized interface protocol time frame that time synchronization node equipment receives is 0, indicate no available reference source, the numerical value of reference time grade section is 0 in the time synchronized interface protocol time frame that this time synchronization node equipment sends, and the time of this node is produced by local internal clocking.
Described each grade time synchronization node equipment is reported the present behavior of node and is received its configuration order simultaneously to time synchronized center webmaster by network management interface, comprise the identify label of time synchronization node equipment, manufacturer's coding in the time synchronized interface protocol time frame that receives is encoded and the reference time grade with the manufacturer in the time synchronized interface protocol time frame of reference time grade and transmission.
When the Time Synchronization Network generation timing loop of having set up, arbitrary grade time synchronization node equipment in the timing loop is that the time synchronization node equipment that is blocked is provided with its time reference grade by the blocking state of its IRIG time synchronized reference source input interface of software control or IRIG time synchronized output interface with by time synchronized center webmaster.
Method of the present invention, by the reference time grade networking of time synchronization node equipment, from the 1st grade time synchronization node equipment to the n (n=1 ..., N) grade time synchronization node equipment carries out physical connection by grade;
Since the 1st grade time synchronization node equipment, each grade time synchronization node equipment receives a time synchronized interface protocol time frame and the downward grade time synchronization node equipment transmitting time sync cap agreement time frame that a last grade time synchronization node equipment sends;
This time synchronized interface protocol time frame has been provided by year and day time that IRIG standard time sync cap agreement utilizes the temporal information coding section to provide, adjust, carry out time synchronized with propagation delay time, for each grade time synchronization node equipment provides local clock by grade;
This time synchronized interface protocol time frame utilizes IRIG standard time sync cap agreement, manufacturer's coding section, leap second identification fields, reference time class information section and verification and message segment are set in the controlled function group of 27 significance bits of this agreement, are respectively applied for expression: manufacturer's coding of time synchronization node equipment; Have or not the leap second and the positive leap second of being or the negative leap second, adjust local zone time for time synchronization node equipment; The reference time grade of time synchronization node equipment in Time Synchronization Network, each grade time synchronization node equipment add 1 to reduce a grade to its reference time grade numerical value automatically on last first-class value of series basis; Verification and information write down all significant bits in the time synchronized interface protocol time frame that is transmitted by the verification of byte statistics and, utilize this verification and information to judge the error code of the time frame that is received for receiving equipment, decide what to use.
Compared with prior art, the present invention has the following advantages:
By in the controlled function group section of 27 significance bits of IRIG time frame format, introducing manufacturer's coding section, solved the problem of the time synchronization node equipment that in consolidated network, can discern different manufacturers; Remind the generation of leap second, the time precision when having improved time synchronized by introducing leap second identification fields in the IRIG time frame format; By in I RIG time frame format, introducing reference time grade section, having solved prior art can not set up time grade Synchronization Network and can't prevent the problem that also settling time, synchronization loop took place, in other words, if time synchronization network does not have the reference time grade, then since the fault of some node device or the timing loop that change caused of transmission route then can not overcome; By in the IRIG time frame format, introducing verification and message segment, solved the time data integrity issue during prior art can't guarantee to transmit, further improved the robustness of Time Synchronization Network; Again by to the design of time grade synchronizing network networking basic principle, guaranteed the compatibility with standard IR IG time interface network, guaranteed determining of each grade time synchronization node device levels in the network simultaneously.
Description of drawings
Fig. 1 is the structure treatment schematic diagram of the present invention to a complete IRIGB120 time frame format;
Fig. 2 is a kind of topological structure schematic diagram that typically utilizes the time grade synchronizing network of time synchronized interface protocol foundation of the present invention;
Fig. 3 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment one;
Fig. 4 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment two;
Fig. 5 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment three;
Fig. 6 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment four;
Fig. 7 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment five;
Fig. 8 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment six;
Fig. 9 is the exemplary reference time grade section setting of timing node equipment in the time grade synchronizing network
Embodiment seven;
Figure 10 is that the exemplary reference time grade section of timing node equipment in the time grade synchronizing network is provided with embodiment eight;
Figure 11 utilizes the time synchronized interface protocol to find the schematic diagram of timing loop, comprises 11-A, 11-B, 11-C and 11-D;
Figure 12 is when timing loop takes place, how to open the schematic diagram of loop restoration grade structure, comprises 12-A and 12-B;
Figure 13 is the schematic diagram that the present invention stops timing loop;
Figure 14 is the schematic diagram that time synchronized webmaster software utilizes the time synchronized interface protocol.
Embodiment
The present invention utilizes standard IR IG time interface to set up time grade Synchronization Network, and be that this purpose of realization has been developed the time synchronized interface protocol, this agreement and standard IR IG time synchronized interface protocol compatibility, utilize this agreement to set up and improve healthy and strong time grade synchronizing network, standard IR IG time synchronized interface protocol then can't be set up and improve healthy and strong time grade synchronizing network.
Referring to Fig. 1, the interface protocol of time synchronized shown in the figure is a complete IRIGB120 time frame format, frame period 1S, and the sign indicating number source is 10ms at interval.Every frame begins (high level, duration 8ms) with P0 and Pr witness marker, is P1 to P9 section then.Be the Time of year information of binary-coded decimal between Pr to P5, comprise the sky information (significance bit is 10) between hour information (significance bit 6), P3 and the P5 between branch information (effectively being 7), P2 and the P3 between information second (significance bit 7), P1 and the P2 between Pr and P1.Be the controlled function group of 27 significance bits between P5 and P8, can write any binary information.Be the Time of day information of the SBC sign indicating number form of 17 significance bits between P8 and next P0, represent current second number in a day.The present invention develops the controlled function group of 27 significance bits between P5 and P8, comprising: write manufacturer's coded message manufacturer's coding section, write the leap second flag information the leap second identification fields, write the reference time grade section of reference time class information and write verification and the verification of information and message segment.
Manufacturer's coding section: 8bit coding, when utilizing the IRIGB120 time frame to carry out the time synchronized networking, according to the information that writes in this manufacturer's coding section can: tell the manufacturer of timing node equipment at an easy rate, be convenient to the interconnected of system and management; For equipment quality and the performance of monitoring manufacturer provides reference, also be convenient to fault location.Adopt the binary coding of 8bit, can represent at least 254 manufacturers (concrete manufacturer's coding rule, can stipulate and distribute that before not making concrete manufacturer's coding rule, this field can be idle or be used as the inner identification of each manufacturer by mechanism independently).
Leap second identification fields: 2bit coding.For example available 00 no leap second of expression; The positive leap second of 01 expression; The negative leap second of 10 expressions; Represent to be used for time synchronized with 11.The leap second setting of sign can be provided with on the same day of generation leap second, remind in advance to be about to receiving equipment leap second take place, and receiving equipment is after receiving the leap second sign, and the definition that can indicate according to leap second when 23:59:58 in evening on the same day (UTC) determines next second.In the time of for example positive leap second that leap second is masked as, then next second then is second day 00:00:00 for 23:59:59 is 23:59:60 then; As the negative leap second that leap second is masked as the time, then next second directly becomes second day 00:00:00; Under the normal condition of no leap second, next second is 23:59:59, is exactly second day 00:00:00 then.Like this, receiving equipment knowing under the situation that leap second was arranged the same day in advance, just can automatically carry out the processing of leap second according to above rule during 23:59:58 on the same day, with exactly with the UTC time synchronized.On the other hand, utilize the specific combination 11 (can not be used for time synchronized) of this flag bit leap second, can also indicate this road IRIG timing code (IRIG standard time sync cap agreement and time synchronized interface protocol of the present invention, what format compatible transmitted all is the IRIG timing code) can not be used for time synchronized for a certain reason, lose the reference synchronization meaning or this device fails can not be used as higher level's timing node device fails, thereby avoid receiving equipment to receive wrong temporal information.
Reference time grade section: 4bit coding can be represented 0-15 reference grade.Two layers of meaning is arranged, and one deck is represented the time synchronized grade of current timing node equipment in network; Another layer expression path of tracing to the source, promptly from 1 grade of timing node equipment (the reference time grade is 1) to this receiving equipment, the quantity of middle elapsed time hierarchy node equipment.Our regulation is the transmission of the every timing node equipment through a grade of 1 node device since reference time grade numerical value, and this reference time grade numerical value adds 1.When the reference time of a timing node equipment, grade numerical value was 15 (as regulation N=15), then this equipment is not used further to synchronously (grade is 0, and expression reference time grade is unavailable).Like this, on the timing node equipment of certain grade of time synchronization network, according to the information that writes this reference time grade section, can know clearly very much reference source input to 1 grade timing node equipment, the quantity of the middle grade of elapsed time synchronization node equipment of wanting from this equipment.This index at first can be used as one of foundation of selecting the reference source input, and receiving equipment can select to arrive 1 grade of minimum circuit of time synchronization node equipment institute elapsed time synchronization node number of devices easily according to this parameter.Such circuit time propagation delay time minimum, time service precision is the highest.Secondly, because each time synchronization node equipment all makes the reference time grade add 1 automatically, the reference time grade of each time synchronization node equipment all necessarily is lower than the reference source time grade of input, can avoid the appearance of synchronization timing loop like this.
For example: when a plurality of time synchronization node equipment connect into a loop, the reference time grade of each time synchronization node equipment all is that the reference grade numerical value of the IRIG timing code of input adds 1, so will soon make the reference grade of one of them time synchronization node equipment reach the lowest class 15, promptly can not be used further to synchronously, like this, the time synchronization node in its downstream just can not obtain the reference source time from this time synchronization node again, and timing loop will be ended automatically.
In fact, because each time synchronization node can automatically be chosen the timing code of highest-ranking time synchronization node equipment output as the main reference source signal of using, and each time synchronization node all can reduce automatically according to the reference time grade of input signal self output the reference time grade, timing loop just can not occur.
Verification and message segment: 8bit coding, for example can be all effective information bit obtain by byte in the current I RIGB120 time frame format even parity check and.Because the needs of networking, time encoding often will just error code might occur through long Distance Transmission in transmission course.If can not correctly check out error code, receiving equipment just may be received wrong temporal information, thereby changes the time mistakenly.Utilize verification and information, the time encoding that receiving equipment can automatic gauging receives has inerrancy, the time of makeing mistakes for verification can be taked the way that abandons, so just can avoid the time receiving equipment to receive wrong time and system time is shaken to a great extent, further improve the robustness of time synchronization network.
Referring to Fig. 2, be the group network topological structure that typically utilizes the time grade synchronizing network of time synchronized interface protocol foundation of the present invention.S1 is 1 grade of time synchronization node equipment among the figure; S21 and S22 are 2 grades of time synchronization node equipment; S31, S32, S33, S34 represent N level time synchronization node equipment (intergrade is omitted, and N is 15 to the maximum).Upper level is connected by data link D1 with next stage time synchronization node equipment room, and data link D1 is the physical link that is used for connect hours synchronization node equipment, can be the cable direct connected link, comprise twisted-pair feeder or coaxial cable, or the 2.64kbit/s special line, or E1, the T1 special line.
Time synchronization node equipment is the elementary cell in the time synchronization network networking structure, there is the clock source inside, receive the IRIG timing code that a last grade time synchronization node equipment sends, and the transmission of a downward grade time synchronization node equipment has the IRIG timing code of time synchronized interface protocol with time synchronized interface protocol.
Time synchronization node equipment has network management interface, IRIG time synchronized reference source input interface and IRIG time synchronized output interface.The IRIG time synchronized reference source input interface of next hierarchy node equipment connects the IRIG time synchronized output interface of a grade node device on it, and the IRIG time synchronized reference source input interface of 1 grade of node device can be connected with GPS.Time synchronization node equipment can be by the blocking-up and the enabled state of its IRIG time synchronized reference source input interface of software control or time synchronized output interface.If connected a plurality of time references source on a plurality of time synchronized reference source input interfaces of synchronization node equipment sometime, the reference source time of this time synchronization node choice of equipment reference time grade numerical value minimum (rank is the highest) is imported the reference time grade that this node is set according to this main time reference source again as the main time reference source input of this node.
The reference synchronization source of each grade time synchronization node equipment can have a plurality of, also is not limited to the IRIG protocol interface, such as being GPS interface and NTP interface.
1 grade of time synchronization node equipment S1, should have a GPS input interface, on this GPS input interface, receive GPS reference source temporal information, on the IRIG output interface, send the time frame of IRIG protocol format, comprise manufacturer's coding, leap second sign, reference time grade and verification and information.1 grade of at different levels as 2 grades of time synchronization node equipment S21, S22 that time synchronization node equipment is following, receive this time frame, decoding IRIG interface protocol and judge according to verification and information whether current data frame has error code, then abandon and make corresponding error code and handle if any error code, if do not have error code then carry out following operation: take-off time information (current second number in year and a day) is to provide the calibration calculations of this node time; Take out manufacturer's coding, give network management; Take out the leap second sign, judge to have or not leap second the same day, so as the same day 23:59:58 begin to do to handle correct leap second; Take out the reference time class information; And the time frame of transmission IRIG protocol format arrives next grade timing node equipment on the IRIG output interface, and this time frame comprises manufacturer's coding of equipment of itself; A downward grade indicated as 3 grades of time synchronization node device forwards leap seconds; According to the temporal information of taking out again the comprehensive transmission time delay adjust local zone time and will this current local zone time write time frame in the temporal information section in; In reference time rank section the reference time grade is added 1, reduces a grade automatically; With count even parity check and and write verification and message segment by byte according to current time frame effective information bit.
So just formed time grade Synchronization Network.According to the time synchronized interface protocol, the time hierarchical organization maximum of a time grade Synchronization Network can only arrive 15 grades, and this is to consider the compatible result of relevant with the NTP agreement with consideration of time performance.
Should follow following basic networking principle when utilizing time synchronization node equipment establishment time grade synchronizing network:
1. if synchronization node equipment has the more than one time reference source of surpassing input sometime, utilize the time synchronized interface protocol, reference time grade section provides the main time reference source input of the minimum time reference source of numerical value as this node in each input of this time synchronization node choice of equipment, imports the time that this time synchronization node is set according to this main time reference source again.
2. if time synchronization node equipment has the time reference source input of global positioning system (GPS), the numerical value of the reference time grade section in the IRIG timing code of this time synchronization node output is fixed as 1, no matter and this moment, whether this time synchronization node equipment also had other IRIG time reference source inputs, the time of the time of this node according to GPS is provided with.
3. if time synchronization node equipment is not time synchronized interface protocol of the present invention (promptly do not contain set manufacturer's coding section, reference time grade section, leap second identification fields and check information section) without any the IRIG timing code of time reference source input or input, the time parameter of this node is produced by local internal clocking under the default situations, following the tracks of as need is not the exterior I RIG timing code of time synchronized interface protocol of the present invention, the default value that the numerical value of the reference time grade section in the IRIG timing code of this time synchronization node output then is provided with for webmaster.
4. import in the time reference source that time synchronization node equipment has except that the gps time reference source, and when the IRIG timing code of input contains time synchronized interface protocol of the present invention (promptly contain set manufacturer's coding section, reference time grade section, leap second identification fields and check information section), reference time grade hop count value in the IRIG timing code of its output promptly reduces a grade automatically for the numerical value of the reference time grade section in the IRIG timing code in this node device of input master time reference source adds 1.
5. if the numerical value of the IRIG timing code reference time grade section of time synchronization node equipment input is 15, the numerical value of the reference time grade section in the IRIG timing code of this node output is 0, indicates no available reference source.The time of this node is produced by its local internal clocking.
6. if the numerical value of the IRIG timing code reference time grade section of timing node equipment input is 0, represent that a last grade time synchronization node equipment does not have the output of available reference source, the numerical value of the reference time grade section in the IRIG timing code of this node output is 0.The time of this node is produced by its local internal clocking.
Further specify time synchronization node equipment when sending the IRIG timing code below in conjunction with Fig. 3 to Figure 10 example,, above-mentioned networking principle is described promptly the setting of reference time grade hop count value.
Time synchronization node equipment NT1 has the input of two-way reference source among Fig. 3, one the tunnel is the input of gps time reference source, another road is the IRIG timing code input of not being with interface protocol lock in time, according to 2 of time grade synchronizing network networking basic principle, the reference time grade of the IRIG timing code of band interface protocol lock in time of this time synchronization node equipment NT1 output is fixed as 1.
Time synchronization node equipment NT1 has the input of two-way reference source among Fig. 4, one the tunnel is the input of gps time reference source, another road is the IRIG timing code input of band interface protocol lock in time, its reference grade hop count value is 2, according to 2 of time grade synchronizing network networking basic principle, the reference time grade of the IRIG timing code of band interface protocol lock in time of this time synchronization node equipment NT1 output is fixed as 1.
Time synchronization node equipment NT1 has the input of one road band time interface protocol of I RIG timing code among Fig. 5, its reference grade hop count value is 2, according to 4 of time grade synchronizing network networking basic principle, the reference time grade of the band time interface protocol of I RIG timing code of this time synchronization node equipment NT1 output is 3.
Time synchronization node equipment NT1 has one the tunnel not to be with the input of time interface protocol of I RIG timing code among Fig. 6, according to 3 of time grade synchronizing network networking basic principle, the reference time rank of the band time interface protocol of I RIG timing code of this timing node equipment NT1 output is by the webmaster setting.
Time synchronization node equipment NT1 among Fig. 7 does not have the input of reference source time, need follow the tracks of the exterior I RIG timing code that does not contain the time synchronized interface protocol again, according to 3 of time grade synchronizing network networking basic principle, the reference time grade of the band time interface protocol of I RIG timing code of this time synchronization node equipment NT1 output is by the webmaster setting.
Time synchronization node equipment NT1 among Fig. 8 has the input of two-way reference source, one the tunnel is the input of band time interface protocol of I RIG timing code, its reference time grade hop count value is 8, another road also is the input of band time interface protocol of I RIG timing code, its reference time grade hop count value is 2, according to time grade synchronizing network networking basic principle 1 and 4, the reference time grade of the band time interface protocol of I RIG timing code of this time synchronization node equipment NT1 output is 3.
Time synchronization node equipment NT1 among Fig. 9 has the input of one road band time interface protocol of I RIG timing code, its reference time grade hop count value is 15, according to 5 of time grade synchronizing network networking basic principle, the reference time grade of the band time interface protocol of I RIG timing code of this time synchronization node equipment NT1 output is 0.
Time synchronization node equipment NT1 among Figure 10 has the input of one road band time interface protocol of I RIG timing code, its reference time rank hop count value is 0, according to 6 of time grade synchronizing network networking basic principle, the reference time grade of the band time interface protocol of I RIG timing code of this time synchronization node equipment NT1 output is 0.
Referring to Figure 11, illustrate the inventive method is how to utilize the time synchronized interface protocol to find timing loop.6 time synchronization node equipment are arranged on the figure intermediate ring road, be respectively NT1 to NT6.If the initial grade of NT1 is 1, then the hierarchal order of NT1 to NT6 is 1-6, shown in 11-A among the figure.
After transmission circulation for the first time, the grade of NT1 becomes 7, and the grade of NT2 becomes 8, and the grade of NT 3 becomes 9, and the grade of NT4 becomes 10, and the grade of NT5 becomes 11, and the grade of NT6 becomes 12, shown in 11-B among the figure.
After transmission circulation for the second time, the grade of NT1 becomes 13, and the grade of NT2 becomes 14, and the grade of NT3 becomes 15, NT4 finds that the grade of NT3 becomes 15, on principle 5 just no longer follow the tracks of it, exporting rank simultaneously is 0, expression upper level reference source is unavailable, NT5 finds that the rank of NT4 becomes 0, on principle 6, the output rank of NT5, NT6 also can become 0, shown in 11-C among the figure.
Transmit circulation time for the third time, all node NT1-NT6 can 6 processing on principle become 0, shown in 11-D among the figure.Timing loop is just broken like this, and the time grade that settles out is respectively that NT1 is 0, and NT2 is 0, and NT3 is 0, and NT4 is 0, and NT5 is 0, and NT6 is 0, and the time parameter of all timing node equipment outputs all is the time that own internal clocking produces.When this situation appears in network, just can affirm that timing loop has appearred in network.
Referring to Figure 12, when timing loop takes place, how to open loop restoration grade structure shown in the figure.6 time synchronization node equipment are arranged on the figure intermediate ring road, be respectively NT1 to NT6.The output level of supposing NT1 is 1, and then the output level of NT2 to NT6 should be 2-6 in proper order.When timing loop took place, the output level of all time synchronization node equipment was 0 all, shown in 12-A among the figure.At this moment the artificial output level that NT4 equipment is set by webmaster is 3, blocks its input physical link simultaneously, promptly blocks the reference source input of NT4 equipment.The output level of stable each time synchronization node equipment NT4 of back, NT5, NT6, NT1, NT2, NT3 is respectively 3,4,5,6,7,8, and the time hierarchical organization is restored, shown in 12-B among the figure.
Another scheme that solves timing loop is the physical connection of artificial disconnected node equipment room, as disconnecting the physical connection of NT3 and NT4 equipment room, the result be the same by the webmaster setting.
Referring to Figure 13, illustrate technical scheme of the present invention is how to stop timing loop to take place.4 time synchronization node equipment are arranged in the loop, be respectively NT1 to NT4.NT1 equipment is owing to there is GPS reference source input, and under normal situation, NT1 equipment is to follow the tracks of the reference source sent into by NT4 equipment.The stable grade of NT1, NT2, NT3, NT4 output is respectively 1,2,3,4, thereby has fundamentally stopped the generation of timing loop.In general, it is that band GPS reference source is imported that a time grade synchronizing network needs at least one time synchronization node equipment, normally the 1st grade of time synchronization node equipment.
Referring to Figure 14, how the webmaster of time synchronized shown in figure software utilizes the time synchronized interface protocol to carry out webmaster.Each time synchronization node equipment NT1-NT4 need receive the configuration order of webmaster simultaneously to the current working condition of time synchronized center webmaster (NMS) report node in the network.The present node working condition of report comprises current device ID, equipment manufacturers' coding of input, the reference time grade of input, the reference time grade of output, equipment manufacturers' coding of output.The node working condition data that each synchronization node NT1-NT4 reports are analyzed at time synchronized center webmaster (NMS), just can clearly draw the time synchronized topological diagram current according to aforesaid networking principle 1, as shown in FIG..The output level of NT1 is 1, equipment manufacturers 1, and the output level of NT2 is 2, equipment manufacturers 2, and the output level of NT3 is 3, equipment manufacturers 1, and the output level of NT4 is 4, equipment manufacturers 2.
The time synchronized interface protocol that the standard IR IG time interface that utilizes time synchronization node equipment disclosed by the invention is set up the method for time grade Synchronization Network and developed for this networking, the IRIC Time Synchronization Network of setting up comprises the time synchronization node equipment that graduation connects, receive and send by time sync cap agreement operation, and being subjected to the software administration of time synchronized webmaster, the reference time rank of each time synchronization node equipment can the dynamic change along with the operation of time synchronized interface protocol.
The inventive method has solved the problem of utilizing standard IR IG and DCLS time interface can't set up perfect time grade Synchronization Network.
Claims (14)
1. the networking implementation method of a Time Synchronization Network is characterized in that comprising:
Each time synchronization node equipment down carries out physical connection since the 1st grade by grade by its reference time grade in Time Synchronization Network;
Since the downward transmitting time sync cap of the 1st grade time synchronization node equipment agreement time frame, each grade time synchronization node equipment after the 1st grade is at the time synchronized interface protocol time frame that receives grade time synchronization node equipment output on it on its IRIG time synchronized reference source input interface, simultaneously on its IRIG time synchronized output interface to its next grade time synchronization node equipment output time sync cap agreement time frame, until the time synchronization node equipment of the lowest class;
In described time synchronized interface protocol time frame, reference time class information section is set, the reference time grade of synchronization node equipment writing time in Time Synchronization Network, time synchronization node equipment through n grade receives step by step and sends, wherein the time synchronization node equipment of each grade is adjusted the reference time grade of this node according to the reference time grade that receives, and this adjusted reference time grade of transmission, reference time grade as its next grade time synchronization node equipment, n=1, ..., N;
In described time synchronized interface protocol time frame, the temporal information section is set, time synchronization node equipment through n grade receives step by step and sends, reference time of receiving with the propagation delay time adjustment of the time synchronization node equipment of each grade wherein, be used to upgrade in the time of this time synchronization node equipment and a grade reference time loses thereon time and continue to safeguard this time synchronization node equipment output time information, simultaneously with time of this node reference time source as its next grade time synchronization node equipment, n=1, ..., N;
In described time synchronized interface protocol time frame, leap second flag information section is set, the leap second that identifies the same day is adjusted mode, time synchronization node equipment by n grade receives and transmits transmission step by step, the unified output time information of adjusting node of the time synchronization node equipment utilization leap second flag information of each grade.
2. method according to claim 1, it is characterized in that: also be included in manufacturer's coding section that time synchronization node equipment is set in the described time synchronized interface protocol time frame, time synchronization node equipment by n grade receives step by step and sends, and wherein the time synchronization node equipment of each grade writes manufacturer's coded message of self grade time synchronization node equipment in this manufacturer's coding section and sends.
3. method according to claim 1, it is characterized in that: also be included in configuration is undertaken by byte all effective information bits in the time frame in the described time synchronized interface protocol time frame even parity check and message segment, time synchronization node equipment by n grade receives step by step and sends, the time frame that receives with verification in the time of reception frame and information checking of the time synchronization node equipment of each grade wherein, and in this message segment, write even parity check that all effective information bits in the transmitting time frame undertake by byte and.
4. method according to claim 3 is characterized in that: when the time frame check results of the verification in the time of reception frame and information and reception was inconsistent, this time synchronization node equipment was abandoned this time synchronized interface protocol time frame.
5. method according to claim 1, it is characterized in that the reference time of the time synchronization node equipment of described each grade with propagation delay time adjustment reception, comprise: the time reference source of synchronization node equipment has one when above in input time, the time reference source that the grade numerical value that reference time grade section provides in each input of this time synchronization node choice of equipment is minimum is imported as the main time reference source of this node, according to this main time reference source input, obtain the time of this node with the temporal information of propagation delay time adjustment reception again.
6. method according to claim 1, it is characterized in that: described the 1st grade time synchronization node equipment, its time reference synchronization source is input as the time reference source of global positioning system, and the time parameter of the 1st grade time synchronization node equipment is determined by this reference source.
7. method according to claim 1, it is characterized in that the reference time grade of the time synchronization node equipment of described each grade according to the reference time grade adjustment that receives self, comprise: when the IRIG of time synchronization node equipment time synchronized reference source input interface had the time reference source of global positioning system, the numerical value of the reference time class information section in the time synchronized interface protocol time frame of this time synchronization node equipment output was fixed as the highest 1 grade.
8. method according to claim 1, it is characterized in that the reference time grade of the time synchronization node equipment of described each grade according to the reference time grade adjustment that receives self, the time of this node also is set according to the reference time grade of this node, comprise: when time synchronization node equipment is not the time synchronized interface protocol without any the IRIG timing code of time reference source input or input, the time of giving tacit consent to this node is produced by local internal clocking, when the needs tracking was not the exterior I RIG timing code of time synchronized interface protocol, the numerical value of the reference time grade section of this time synchronization node output was the default value that time synchronized center webmaster is provided with.
9. method according to claim 1, it is characterized in that the reference time grade of the time synchronization node equipment of described each grade according to the reference time grade adjustment that receives self, comprise: import in the time reference source that time synchronization node equipment has except that global positioning system time reference source, and when the IRI G timing code of input was the time synchronized interface protocol, this time synchronization node equipment added 1 with the numerical value of reference time grade section in the time synchronized interface protocol time frame that receives, automatically reduce after the grade reference time grade numerical value as this time synchronization node equipment.
10. method according to claim 1, it is characterized in that the reference time grade of the time synchronization node equipment of described each grade according to the reference time grade adjustment that receives self, the time of this node also is set according to the reference time grade of this node, comprise: when the numerical value of reference time grade section in the time synchronized interface protocol time frame that time synchronization node equipment receives is N, indicate no available reference source, the numerical value of reference time grade section is 0 in the time synchronized interface protocol time frame that this time synchronization node equipment sends, and the time of this node is produced by local internal clocking.
11. method according to claim 1, it is characterized in that the reference time grade of the time synchronization node equipment of described each grade according to the reference time grade adjustment that receives self, the time of this node also is set according to the reference time grade of this node, comprise: when the numerical value of reference time grade section in the time synchronized interface protocol time frame that time synchronization node equipment receives is 0, indicate no available reference source, the numerical value of reference time grade section is 0 in the time synchronized interface protocol time frame that this time synchronization node equipment sends, and the time of this node is produced by local internal clocking.
12. method according to claim 1, it is characterized in that also comprising: described each grade time synchronization node equipment is reported the present behavior of node and is received its configuration order simultaneously to time synchronized center webmaster by network management interface, comprise the identify label of time synchronization node equipment, manufacturer's coding in the time synchronized interface protocol time frame that receives is encoded and the reference time grade with the manufacturer in the time synchronized interface protocol time frame of reference time grade and transmission.
13. method according to claim 1, it is characterized in that also comprising: when the Time Synchronization Network generation timing loop of having set up, arbitrary grade time synchronization node equipment in the timing loop is that the time synchronization node equipment that is blocked is provided with its time reference grade by the blocking state of its IRIG time synchronized reference source input interface of software control or IRIG time synchronized output interface with by time synchronized center webmaster.
14. method according to claim 1 is characterized in that described leap second sign, by dibit encoding indicate respectively no leap second, the positive leap second, the negative leap second and instruction time sync cap agreement time frame can not be used for time synchronized.
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