CN105119678A - Synchronous digital hierarchy (SDH)-E1 network based method for realizing precise time protocol (PTP) nanosecond precision transmission - Google Patents
Synchronous digital hierarchy (SDH)-E1 network based method for realizing precise time protocol (PTP) nanosecond precision transmission Download PDFInfo
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- CN105119678A CN105119678A CN201510568721.7A CN201510568721A CN105119678A CN 105119678 A CN105119678 A CN 105119678A CN 201510568721 A CN201510568721 A CN 201510568721A CN 105119678 A CN105119678 A CN 105119678A
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Abstract
The invention discloses a power system synchronous digital hierarchy (SDH) network based method for compensating dynamic time deviation of transmission of a precise time protocol (PTP) time signal by an E1 channel. Through adoption of the method, nanosecond (submicrosecond) time precision transmission is realized, the current power system can transmit a submicrosecond high precision time signal in a long distance through wire transmission, and the precision, reliability and security of a power time synchronous network are greatly improved.
Description
Technical field
The present invention relates to the transmission of high-precision network time synchronization, be specifically related to a kind of dynamic time deviation compensation method of the E1 channel transfer PTP time signal based on POWER SYSTEM SDH network, realize the transmission of nanosecond (submicrosecond level) time precision.
Background technology
At present, various time synchronism apparatus has a wide range of applications in various industry, as subway system, high-speed railways, electric power system, intelligent hospital, intelligent transportation, intelligent city, Bank Danamon system etc.Each industry is according to residing environment and demand, and the timing tracking accuracy of needs is also different.
In recent years, along with the development of science and technology, all trades and professions propose more and more higher requirement to network time service precision, and IEEE1588 standard proposes a kind of time protocol (PTP) of precision, adopts this agreement to realize synchronously point-device.
The required precision of electric power system to time synchronized is more and more higher, reach the demand of submicrosecond level, traditional time tranfer mode and agreement all can not meet such demand, therefore the dependence of electric power system at present for GPS and this wireless receiver of big-dipper satellite is very serious, more and more urgent to the demand of the reliable high-precision wired route in ground.Therefore transmit by the PTP of POWER SYSTEM SDH network E1 passage the transmission realizing nanosecond (submicrosecond level) time precision and also become recent study hotspot.But, because also exist serious network asymmetry and SDH network self-healing function based on POWER SYSTEM SDH network E1 passage cause the two time deviation caused unfixing of route to be difficult to realize in real time effectively dynamic compensation.
In view of this, one object of the present invention is the dynamic time deviation compensation method providing a kind of E1 channel transfer PTP time signal based on POWER SYSTEM SDH network, realizes nanosecond (submicrosecond level) time precision transmission paragraph.
Summary of the invention
One object of the present invention, with the dynamic time deviation compensation method that a kind of E1 channel transfer PTP time signal based on POWER SYSTEM SDH network is provided, realize nanosecond (submicrosecond level) time precision transmission.Fig. 2 is the method based on POWER SYSTEM SDH network E1 channel transfer PTP time signal usually adopted at present, is described as follows, GPS followed the tracks of by PTP master clock or Big Dipper satellite signal obtains high-precision time source, and the output PTP signal accuracy of PTP master clock is better than ± 100 nanoseconds usually, exports PTP signal after Ethernet/E1 transducer, enters SDH network, at PTP from clock end, E1 signal reverts to PTP time signal after E1/ Ethernet transducer, this PTP signal is followed the tracks of from clock, PTP NTP (Network Time Protocol) is the submicrosecond level time precision that this prerequisite symmetrical just can reach agreement itself and can reach based on master clock with from the network between clock, but because the transmission channel adding protocol converter based on the E1 channel transfer of SDH exists not fixing of the route that serious asymmetry on network and E1 route come along with SDH network self-adjusting straps, PTP is made to there is systematic time deviation from the time that clock recovers, the route that this time deviation is come along with SDH network self-adjusting straps unfixing and changing, and time deviation is along with the number of nodes of the E1 route of SDH network, distance and change, there is uncertain and mutability.Fig. 1 is the dynamic time compensation method based on POWER SYSTEM SDH network E1 channel transfer PTP time signal that the present invention adopts.PTP the adds protocol converter transmission channel transmission PTP time from the E1 channel transfer that clock have employed identical SDH carries out the method for feedback time monitoring to the PTP monitoring card of PTP master clock, half dynamic compensation monitoring card being monitored PTP droop to PTP from clock, thus not the fixing of the route come along with SDH network self-adjusting straps of the serious asymmetry eliminated on current method network and E1 route, PTP is eliminated from the systematic time deviation of clock recovery time, this make-up time deviation is not fixed along with the route that SDH network self-adjusting straps comes and dynamically changes, thus eliminate from the number of nodes of clock time along with the E1 route of SDH network, distance and the impact that changes.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present invention.
Fig. 2 is at present based on the system block diagram that SDH network E1 passage PTP transmits.
Fig. 3 is the primary module functional block diagram of contrive equipment.
Embodiment
In order to make object of the present invention, clearly, below in conjunction with accompanying drawing, the present invention is described in further detail for technical scheme and advantage.
Method of the present invention is applicable to multi-path real-time monitoring, and monitoring capacity and monitoring time synchronizing signal can have been come by the multiple monitor card of flexible configuration as required, and monitoring card adopts programming device+ARM.PTP master clock provided by the invention, except providing all functions of PTP master clock, adds PTP time synchronized monitoring card, it comprises measurement data receiver module, measurement data sending module, measured data processing module, the standard time obtains generation module, and alarm module, as Fig. 3.
In the present invention, the standard time acquisition module of time synchronized monitoring card obtains the standard time from PTP master clock, and making as the time source of monitoring card and monitored PTP from the time source of clock is source at the same time, thus ensures the accuracy of monitoring.Usually adopt GPS and big-dipper satellite Received signal strength as accurate input source for PTP master clock, produce local standard time PPS+TOD, the local standard time passes to every block monitor card by communication bus.
In the present invention, the measured data processing module of time synchronized monitoring card reads the PTP time data of reception in real time, compared by data processing module and local standard time, obtain a time deviation, its half the time deviation sends to PTP from clock by self-defining communication protocol by data transmission blocks, PTP receives these time deviation data from clock and carries out time bias, thus eliminates the set time deviation because SDH transmission network asymmetry causes.Card there is warning device, when monitoring time of reception abnormal signal, alarm signal can occur.
Through decoder module, according to the external standard time obtained, external standard time and local standard time can compare by processing module, in the time error of monitor input terminal with regard to real-time calculating external time synchronizing signal, farthest reduce the measure error of system.
In sum, the present invention has the following advantages:
(1), adopt and realize dynamically eliminating the time deviation that route asymmetry causes to master clock feedback PTP time signal from clock;
(2), provide the method for real-time of parallel channel, guarantee the accuracy of multi-channel measurement;
(3), the internal system communication protocol made by oneself, be various system flexible configuration monitoring capacity and monitoring time synchronizing signal type.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change made under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (3)
1. at a kind of dynamic time deviation compensation method of the E1 channel transfer PTP time signal based on POWER SYSTEM SDH network, realize the transmission of nanosecond (submicrosecond level) time precision, it is characterized in that: achieve PTP from clock because transmission route asymmetry and route change the dynamic realtime auto-compensation causing PTP time deviation.
2. in a kind of dynamic method of real-time automatic compensation PTP time deviation, it is characterized in that the PTP output module by increasing from clock at PTP exports PTP signal, PTP master clock increases PTP Input Monitor Connector module, and the time deviation that PTP master clock is measured PTP monitoring modular has been come.
3. according to right 2, PTP deviation monitor signal it is desirable that and PTP time tranfer E1 passage independently E1 passage or same passage, autonomous channel is the E1 passage that all routes of E1 are identical, thus ensure that the symmetry of PTP deviation monitor signal E1 passage and PTP time tranfer E1 passage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059621A (en) * | 2016-06-27 | 2016-10-26 | 中国电力科学研究院 | Method, equipment and system for carrying out site testing on accuracy of wired time transmission |
| CN107168163A (en) * | 2017-05-27 | 2017-09-15 | 西安工业大学 | A kind of submicrosecond Multi-path synchronous triggering device and its triggering method |
| CN112202522A (en) * | 2020-09-29 | 2021-01-08 | 国智恒北斗科技集团股份有限公司 | High-precision optical cable time service system |
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2015
- 2015-09-09 CN CN201510568721.7A patent/CN105119678A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059621A (en) * | 2016-06-27 | 2016-10-26 | 中国电力科学研究院 | Method, equipment and system for carrying out site testing on accuracy of wired time transmission |
| CN106059621B (en) * | 2016-06-27 | 2021-04-02 | 中国电力科学研究院 | Method, equipment and system for testing wired time transmission accuracy on site |
| CN107168163A (en) * | 2017-05-27 | 2017-09-15 | 西安工业大学 | A kind of submicrosecond Multi-path synchronous triggering device and its triggering method |
| CN112202522A (en) * | 2020-09-29 | 2021-01-08 | 国智恒北斗科技集团股份有限公司 | High-precision optical cable time service system |
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