CN102291178A - Method and device for measuring the asymmetrical time delay of optical fiber - Google Patents
Method and device for measuring the asymmetrical time delay of optical fiber Download PDFInfo
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- CN102291178A CN102291178A CN2011102644688A CN201110264468A CN102291178A CN 102291178 A CN102291178 A CN 102291178A CN 2011102644688 A CN2011102644688 A CN 2011102644688A CN 201110264468 A CN201110264468 A CN 201110264468A CN 102291178 A CN102291178 A CN 102291178A
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
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Abstract
The invention discloses a method and a device for measuring the asymmetrical time delay of optical fibers. The method comprises the following steps: an RTU (Remote Terminal Unit) allocates the work states of the Master and Slave ends of an optical fiber circuit; the RTU commands to measure a first optical fiber, a PPU (Peripheral Processor Unit) positioned on a Master side sends a message, records sending time t1 and transmits to the Slave; a PPU positioned on a Slave side receives the message, records arrival time t2 and stores corresponding to the t1; the RTU displays that the first optical fiber is completely measured, prepares to measure a second optical fiber and swaps the two optical fibers; the RTU commands to measure the second optical fiber, the PPU positioned on the Master side sends the message, records sending time t'1 and transmits to the Slave; the PPU positioned on the Slave side receives the message, records arrival time t'2 and stores corresponding to the t'1; and an ACU (Add Control Unit) works out an asymmetrical time delay compensation value and transmits to the RTU. The invention has the advantages of cost and labor saving, simplicity, fastness, short stabilization time and high measurement efficiency and accuracy without field limiting.
Description
Technical field
The present invention relates to optical communication field, particularly relate to a kind of method and device of measuring optical fiber asymmetry time delay.
Background technology
Optical communication network is as present mobile communication service bearer network, need to realize IEEE1588v2 (the 1588 time synchronization protocol v2 versions that IEEE formulates) time synchronized function, send time synchronization information to each network node, realize high precision time synchronization.And for the IEEE1588v2 time synchronized, the inconsistent circuit asymmetry that causes of sending direction and receive direction fiber lengths on the optical interface will directly influence synchronous precision of its time.So in optical communication network, dispose the IEEE1588v2 Time Synchronization Network, must accurately measure the asymmetry that exists in the circuit, with the fibre circuit asymmetry time delay value of measuring, at IEEE1588v2 time synchronized port PTP (Precision Time Protocal, Precision Time Protocol) compensates in the computing, could eliminate the synchronous error that the circuit asymmetry causes.
Measurement circuitry asymmetry time delay is a difficult problem during engineering is used fast and accurately.At present, generally adopt meter specially to test, mainly have following defective:
(1) instrument costs an arm and a leg, and carries inconvenience, is subjected to the place restriction big.
(2) the general limited amount of instrument, test need be set up satellite antenna, receive the satellite time service, need long stabilization time, also can be subjected to weather, to the influence of factors such as empty subtended angle, also need to get rid of satellite antenna length and be connected the influence of length to the result with cable in test, method of testing is complicated, and testing efficiency is low.
(3) Meter Test is a kind of relative test, and test result is subjected to the influence of precision of time synchronism equipment and satellite time service drift, and error is bigger, and test job need be from the source end, carry out step by step,, will inevitably influence subordinate's test result if the previous stage test is inaccurate.Therefore, measuring accuracy is not high, can not satisfy the needs of large-scale engineering applications.
Summary of the invention
The objective of the invention is provides a kind of method and device of measuring optical fiber asymmetry time delay in order to overcome the deficiency of above-mentioned background technology, not limited by the place, can save cost and manpower, testing procedure is simple, and the steady testing time is shorter, and testing efficiency and precision are higher.
The method of measuring optical fiber asymmetry time delay provided by the invention may further comprise the steps:
(1) selection needs the fibre circuit of test, comprises two optical fiber in the described fibre circuit, the test master port Master and the operating state of testing from port Slave of remote control unit RTU configuration fibre circuit two ends optical node;
(2) RTU assigns the instruction of measuring first optical fiber, and Master side protocol processing unit PPU sends test packet continuously, writes down the timestamp t1 of each test packet delivery time, and sends t1 to Slave; Slave side PPU whenever receives a test packet, writes down the timestamp t2 of this test packet due in, the corresponding storage of t1 that sends with Master; Up to gathering the enough t1 and the t2 of group number, return the information that first optical fiber measurement finished to RTU;
(3) first optical fiber measurement of RTU demonstration finished, when preparing to measure the information of second optical fiber, notified on-the-spot with first optical fiber and second optical fiber exchange;
(4) RTU assigns the instruction of measuring second optical fiber, and Master side PPU sends test packet continuously, writes down the timestamp t`1 of each test packet delivery time, and sends t`1 to Slave; Slave side PPU whenever receives a test packet, writes down the timestamp t`2 of this test packet due in, the corresponding storage of t`1 that sends with Master; Up to gathering the enough t`1 and the t`2 of group number, notification analysis computing unit ACU begins to start;
(5) ACU carries out analytical calculation to the data of gathering, and the offset t of the fibre circuit asymmetry time delay that draws is sent to RTU.
In technique scheme, the offset t=(t1-t2+t`2-t`1)/2 of fibre circuit asymmetry time delay described in the step (5).
In technique scheme, t1 is by described test packet or follow message and transmit in the step (2).
In technique scheme, t`1 is by described test packet or follow message and transmit in the step (4).
In technique scheme, step (5) is further comprising the steps of afterwards: if ACU analyzes the data existing problems that draw collection, the then information that sends test crash, tests again to RTU.
The device of measuring optical fiber asymmetry time delay provided by the invention comprises:
Timestamp unit TSU is used for producing and logging timestamp information t1 when the Master side sends test packet, according to the test packet pattern, timestamp information t1 is write the test packet transmission or sends timestamp information t1 to PPU; When the Slave side joint is received test packet, produce and logging timestamp information t2;
Protocol processing unit PPU is used to determine the test packet pattern, sends test packet in the Master side, when the test packet pattern is follow the mode, obtains the timestamp information t1 of test packet delivery time, and sends t1 to Slave by following message; At Slave side joint Acceptance Tests message, obtain the timestamp information t2 of test packet due in, the t1 that sends with Master carries out corresponding record, for data are prepared in follow-up calculating;
Analytical calculation unit ACU after being used for the timestamp information collection and finishing, starts in the Slave side, and the data of gathering are carried out analytical calculation, draws fibre circuit asymmetry delay data, calculates fibre circuit asymmetry delay compensation value;
Remote control unit RTU is used to be provided with the operating state of test node, assigns test instruction and feedback test result.
In technique scheme, described analytical calculation unit ACU also is used for the data of gathering are analyzed, and the data that the filtering error is bigger are calculated again.
In technique scheme, described protocol processing unit PPU also is used for decision by test packet or follow message and transmit t1.
Compared with prior art, advantage of the present invention is as follows:
(1) the present invention is based on bag transmission and timestamp mechanism in the optical communication network transmission equipment, fine time stamp mensuration is changed in employing, by sending test packet, acquisition time stabs data, adopt exchange optical fiber to test, simple and fast carries out analytical calculation according to the data of gathering, and can make things convenient for and accurately measures circuit asymmetry time delay.
(2) the present invention adopts and changes fine time stamp mensuration, circuit asymmetry time delay in the measuring light communication network, need not additionally acquire and carry expensive measuring instrument again, need not to set up satellite antenna, not limited by the place, in large-scale engineering applications, can save a large amount of funds spendings and manpower spending.
(3) the fine time stamp mensuration that changes of the present invention's employing is a kind of absolute test, each section test all opposes, impact can for the test of subordinate, need be according to carrying out in proper order step by step yet, measuring accuracy is mainly determined by the timestamp precision, test result has the high and little characteristics of error of reliability, so measuring accuracy is higher.
(4) the present invention adopts and changes fine time stamp mensuration, needing to have avoided the drawback of satellite time service, and the steady testing time is shorter, and testing procedure is simple, and testing efficiency is improved.
(5) the present invention can be based on the hardware mechanisms of optical transmission device itself, and all nodes can both be finished test, has overcome the limited defective of metered quantity, thereby has had better application.
Description of drawings
Fig. 1 is the structured flowchart of the device of embodiment of the invention measuring optical fiber asymmetry time delay;
Fig. 2 is the mode of operation schematic diagram of TSU in the embodiment of the invention;
Fig. 3 is the test schematic diagram that changes fine time stamp method of testing project 1 in the embodiment of the invention;
Fig. 4 is the test schematic diagram that changes fine time stamp method of testing project 2 in the embodiment of the invention;
Fig. 5 is the topological diagram that changes the test case of fine time stamp method of testing in the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Figure 1, the device of the measuring optical fiber asymmetry time delay that the embodiment of the invention provides, comprise TSU (Timestamp Unit, the timestamp unit), PPU (Protocol Processing Unit, protocol processing unit), ACU (Analysis and Calculation Unit, the analytical calculation unit) and RTU (Remote control unit, remote control unit), wherein:
TSU is used for producing and logging timestamp information t1 when the Master side sends test packet, according to the test packet pattern, timestamp information t1 is write the test packet transmission or sends timestamp information t1 to PPU; When the Slave side joint is received test packet, produce and logging timestamp information t2.TSU need guarantee enough precision and stability, and the precision of timestamp and stability will directly determine the precision and the accuracy of measurement.
PPU is used to determine the test packet pattern: by test packet or follow message and transmit t1.Send test packet in the Master side, when follow the mode, obtain the timestamp information t1 of test packet delivery time, and send t1 to Slave by following message; At Slave side joint Acceptance Tests message, obtain the timestamp information t2 of test packet due in, the t1 that sends with Master carries out corresponding record, for data are prepared in follow-up calculating;
ACU is used for the timestamp information collection finish after, start in the Slave side, the data of gathering are carried out analytical calculation, draw fibre circuit asymmetry delay data, calculate fibre circuit asymmetry delay compensation value.ACU needs earlier the data of gathering to be analyzed, and the data that the filtering error is bigger are calculated again, guarantee the accuracy of result data.
RTU is used to be provided with the operating state of test node, assigns test instruction and feedback test result.By the control of remote control unit RTU, can make the surveying work operation become simple, by obtaining feedback data, can monitor test process, and in time obtain test result.
The embodiment of the invention is to realize in PTN (Packet Transport Network, Packet Transport Network) equipment, and each several part realization and working method are described as follows:
RTU embeds PTN system network management equipment, by network management system realize with network in communicating by letter between each node.RTU passes through the Master and the Slave state of network management interface configuration testing port, and disposes two nodes that take one's test, and system clock frequency all locks same time source, keeps stable to guarantee the Tslaveoffset (time deviation value) between two nodes.RTU can assign test instruction by the page that designs on the network management interface, and can observe the test mode information and the The ultimate results of distant-end node feedback.
TSU can shared IEEE1588v2 time synchronized in the PTN system the timestamp module, the mode of operation of TSU is referring to shown in Figure 2.In order to guarantee the accuracy of timestamp, TSU need the test packet entry-line sends moment the identification test packet and generation time stab, and test packet from circuit enter TSU moment the identification test packet and generation time stab.TSU is positioned at PHY (the Physical Layer near circuit in the embodiment of the invention, physical chip) layer, Destination MAC (Medium/MediaAccess Control by the identification test packet, medium access control) message is caught in the address, and the timestamp of generation is finally obtained by upper application software.TSU using system clock 125M generation time stabs, and the systematic error of bringing is 8ns, by the average computing, can be controlled at measure error in the 16ns.
PPU operates in plate and carries CPU (Central Processing Unit in the embodiment of the invention, central processing unit) on, use message format and time stamp transmission method in the PTP agreement, realize that the test between Master and the Slave is mutual, and the t1 and the t2 data of corresponding stored needs.Sync (sync message) as test packet, is triggered TSU and produces t1 and t2, and carry t1 information and send Slave to by following message.
ACU also runs on plate and carries CPU in the embodiment of the invention, after measurement data acquisition finishes, the data of gathering is analyzed.After confirming the reasonability of data, carry out computing, calculate the final result that circuit is not compensated the property time delay of being used for.
On the basis of said apparatus, the method for the measuring optical fiber asymmetry time delay that the embodiment of the invention provides may further comprise the steps:
(1) selection needs the fibre circuit of test, comprises two optical fiber in the described fibre circuit, the test master port Master and the operating state of testing from port Slave of remote control unit RTU configuration fibre circuit two ends optical node;
(2) RTU assigns the instruction of measuring first optical fiber, and Master side protocol processing unit PPU sends test packet continuously, writes down the timestamp t1 of each test packet delivery time, by test packet or follow message and send t1 to Slave; Slave side PPU whenever receives a test packet, writes down the timestamp t2 of this test packet due in, the corresponding storage of t1 that sends with Master; Up to gathering the enough t1 and the t2 of group number, return the information that first optical fiber measurement finished to RTU;
(3) first optical fiber measurement of RTU demonstration finished, when preparing to measure the information of second optical fiber, notified on-the-spot with first optical fiber and second optical fiber exchange;
(4) RTU assigns the instruction of measuring second optical fiber, and Master side PPU sends test packet continuously, writes down the timestamp t`1 of each test packet delivery time, and sends t`1 to Slave by following message; Slave side PPU whenever receives a test packet, writes down the timestamp t`2 of this test packet due in, the corresponding storage of t`1 that sends with Master; Up to gathering the enough t`1 and the t`2 of group number, notification analysis computing unit ACU begins to start;
(5) ACU carries out analytical calculation to the data of gathering, and the offset t of the fibre circuit asymmetry time delay that draws is sent to RTU, t=(t1-t2+t`2-t`1)/2; If ACU analyzes the data existing problems that draw collection, the then information that sends test crash, tests again to RTU.
The principle of the embodiment of the invention is elaborated as follows:
The embodiment of the invention is utilized bag transmission and timestamp mechanism in the optical communication network, by on same smooth direction of transfer, respectively 2 optical fiber is measured, and collects 2 groups of time stamp datas.By the timestamp of gathering is carried out analytical calculation, just can obtain circuit asymmetry time delay value accurately again.
Basic analytical calculation principle is as follows:
Suppose that 2 optical fiber between Master (test master port) and Slave (test is from port) are respectively optical fiber 1 and optical fiber 2.
Optical fiber when optical fiber 1 is measured connects referring to shown in Figure 3, after optical fiber 1 is measured, carries out analytical calculation: t2-t1=Tm2s+Tslaveoffset
Wherein, t1 is the test packet delivery time timestamp of Master record, t2 is the test packet timestamp time of reception of Slave record, and Tm2s is that message transmits the circuit time delay of being brought by optical fiber 1 at optical fiber 1, and Tslaveoffset is the time deviation value between two test nodes that connect of optical fiber.
Optical fiber when optical fiber 2 is measured connects referring to shown in Figure 4, and optical fiber 1 is replaced with after optical fiber 2 measures, and carries out analytical calculation: t`2-t`1=T`m2s+T`slaveoffset
Wherein, t`1 is the test packet delivery time timestamp of Master record, t`2 is the test packet timestamp time of reception of Slave record, to be message transmit the circuit time delay of being brought by optical fiber 2 at optical fiber 2 to T`m2s, and T`slaveoffset is the time deviation value between 2 test nodes that connect of optical fiber.
When we guarantee that the time deviation value stabilization between two nodes is constant in the measuring process, promptly
Tslaveoffset＝T`slaveoffset
By calculating the asymmetry time delay value Δ T can draw between optical fiber 1 and the optical fiber 2,
ΔT＝Tm2s-T`m2s
＝(t2-t1-Tslaveoffset)-(t`2-t`1-T`slaveoffset)
＝(t2-t1)-(t`2-t`1)
Calculate that according to the PTP principle error that circuit asymmetry time delay causes the time synchronized result is-Δ T/2, directly calculates this value and is used to carry out circuit asymmetry delay compensation, the computational process of the offset t of fibre circuit asymmetry time delay is as follows:
t＝-ΔT/2
＝【(t2-t1)-(t`2-t`1)】/2
＝(t1-t2+t`2-t`1)/2。
Test case to a circuit asymmetry time delay is elaborated below.
The topological diagram of test network adopts time series analysis instrument measurement data as the comparison data referring to shown in Figure 5 in the embodiment of the invention, and a complete test operating procedure is as follows:
(1) configure clock frequency analyzer lock in time, the GE mouth of measurement circuit node 1 is configured to Master, and the GE mouth of node 2 is configured to Slave.The M2S direction refers to the direction of node 1 to node 2 like this, and the S2M direction is the direction of node 2 to node 1.
(2) assign test instruction for node 2 by webmaster, beginning measuring fiber 1.
(3) check the test mode of optical fiber 1, when the test mode of optical fiber 1 is shown as successfully, with the optical fiber exchange of optical fiber and the S2M of M2S, referring to shown in Figure 4.
(4) give node 2 test instructions by webmaster, beginning measuring fiber 2.
(5) check the test mode of optical fiber 2, when the test mode of optical fiber 2 was shown as successfully, test result also together showed.
(6) logging test results is provided with in the webmaster corresponding port, has just finished the compensation to the asymmetric time delay of circuit.
Test process and data record are as follows:
A, same test optical fiber
Accuracy and the stability that fine time stamp method of testing is measured is changed in checking.The optical fiber of 2 equal in length is inserted measurement circuit, and fiber lengths is about 2 meters.Optical fiber 1 direction is M2S, and optical fiber 2 directions are S2M, and compensation input and output circuit time delay is to the error that causes of time series analysis instrument test.Do not change fine operation, optical fiber 1 is carried out measuring operation 10 times, the data of record are referring to table 1.
Table 1, same test optical fiber result
| Testing time | Test asymmetric data (ns) | Time series analysis instrument measurement data (ns) |
| 1 | 0 | 4.649 |
| 2 | 1 | 4.664 |
| 3 | 0 | 4.708 |
| 4 | 0 | 4.786 |
| 5 | 0 | 4.738 |
| 6 | 0 | 4.788 |
| 7 | 0 | 4.781 |
| 8 | 0 | 4.777 |
| 9 | 2 | 4.800 |
| 10 | 0 | 4.806 |
B, asymmetric test optical fiber
The test accuracy of validation test stability and 2 kinds of asymmetric situations.The optical fiber 1 of former M2S direction is changed to about 20 meters long optical fiber, and the optical fiber 2 of S2M direction is constant, and length still is 2 meters, begins test.Project 1 test finishes, exchange optical fiber, and promptly the M2S direction is changed to optical fiber 2, and the S2M direction is changed to optical fiber 1, and project 2 tests finish record test data and time series analysis instrument measurement data.Optical fiber does not reduce, and directly begins project 1 test of next round, changes fibre after finishing again and carries out project 2 tests, and so circulation, so result is positive and negative replacing, and test result is referring to table 2.
Table 2, asymmetric test optical fiber result
| Testing time | Test asymmetric data (ns) | Time series analysis instrument measurement data (ns) |
| 1 | -44 | -33.5 |
| 2 | 44 | 45.3 |
| 3 | -43 | -33.0 |
| 4 | 44 | 44.8 |
| 5 | -44 | -43.6 |
| 6 | 42 | 44.6 |
| 7 | -46 | -42.1 |
| 8 | 44 | 46.2 |
| 9 | -44 | -42.1 |
| 10 | 44 | 36.7 |
C, the asymmetric test optical fiber of 24 kms
Validation test stability and long fine situation to test accuracy.It is 24463 meters optical fiber that length is gone in 1 changing-over of M2S direction optical fiber, and S2M direction optical fiber 2 is constant, and length still is 2 meters.Testing procedure as above writes down the data of 10 tests.
Table 3, the asymmetric test optical fiber result of 24 kms
| Testing time | Test asymmetric data (ns) | Time series analysis instrument measurement data (ns) |
| 1 | -59915 | -59932 |
| 2 | 59915 | 59909 |
| 3 | -59915 | -59932 |
| 4 | 59914 | 59901 |
| 5 | -59912 | -59924 |
| 6 | 59913 | 59908 |
| 7 | -59915 | -59932 |
| 8 | 59916 | 59900 |
| 9 | -59911 | -59924 |
| 10 | 59911 | 59892 |
Can draw from above test result: the accuracy and the stability of changing fine time stamp method of testing measurement are all fine.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (8)
1. the method for a measuring optical fiber asymmetry time delay is characterized in that may further comprise the steps:
(1) selection needs the fibre circuit of test, comprises two optical fiber in the described fibre circuit, the test master port Master and the operating state of testing from port Slave of remote control unit RTU configuration fibre circuit two ends optical node;
(2) RTU assigns the instruction of measuring first optical fiber, and Master side protocol processing unit PPU sends test packet continuously, writes down the timestamp t1 of each test packet delivery time, and sends t1 to Slave; Slave side PPU whenever receives a test packet, writes down the timestamp t2 of this test packet due in, the corresponding storage of t1 that sends with Master; Up to gathering the enough t1 and the t2 of group number, return the information that first optical fiber measurement finished to RTU;
(3) first optical fiber measurement of RTU demonstration finished, when preparing to measure the information of second optical fiber, notified on-the-spot with first optical fiber and second optical fiber exchange;
(4) RTU assigns the instruction of measuring second optical fiber, and Master side PPU sends test packet continuously, writes down the timestamp t`1 of each test packet delivery time, and sends t`1 to Slave; Slave side PPU whenever receives a test packet, writes down the timestamp t`2 of this test packet due in, the corresponding storage of t`1 that sends with Master; Up to gathering the enough t`1 and the t`2 of group number, notification analysis computing unit ACU begins to start;
(5) ACU carries out analytical calculation to the data of gathering, and the offset t of the fibre circuit asymmetry time delay that draws is sent to RTU.
2. the method for measuring optical fiber asymmetry time delay as claimed in claim 1 is characterized in that: the offset t=(t1-t2+t`2-t`1)/2 of fibre circuit asymmetry time delay described in the step (5).
3. the method for measuring optical fiber asymmetry time delay as claimed in claim 1 or 2 is characterized in that: t1 is by described test packet or follow message and transmit in the step (2).
4. the method for measuring optical fiber asymmetry time delay as claimed in claim 1 or 2 is characterized in that: t`1 is by described test packet or follow message and transmit in the step (4).
5. the method for measuring optical fiber asymmetry time delay as claimed in claim 1 or 2 is characterized in that: step (5) is further comprising the steps of afterwards:
If ACU analyzes the data existing problems that draw collection, the then information that sends test crash, tests again to RTU.
6. the device of a measuring optical fiber asymmetry time delay is characterized in that comprising:
Timestamp unit TSU is used for producing and logging timestamp information t1 when the Master side sends test packet, according to the test packet pattern, timestamp information t1 is write the test packet transmission or sends timestamp information t1 to PPU; When the Slave side joint is received test packet, produce and logging timestamp information t2;
Protocol processing unit PPU is used to determine the test packet pattern, sends test packet in the Master side, when the test packet pattern is follow the mode, obtains the timestamp information t1 of test packet delivery time, and sends t1 to Slave with following message; At Slave side joint Acceptance Tests message, obtain the timestamp information t2 of test packet due in, the t1 that sends with Master carries out corresponding record, for data are prepared in follow-up calculating;
Analytical calculation unit ACU after being used for the timestamp information collection and finishing, starts in the Slave side, and the data of gathering are carried out analytical calculation, draws fibre circuit asymmetry delay data, calculates fibre circuit asymmetry delay compensation value;
Remote control unit RTU is used to be provided with the operating state of test node, assigns test instruction and feedback test result.
7. the device of measuring optical fiber asymmetry time delay as claimed in claim 6 is characterized in that: described analytical calculation unit ACU, also be used for the data of gathering are analyzed, and the data that the filtering error is bigger are calculated again.
8. as the device of claim 6 or 7 described measuring optical fiber asymmetry time delays, it is characterized in that: described protocol processing unit PPU also is used for decision by test packet or follow message and transmit t1.
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| PCT/CN2012/079845 WO2013034041A1 (en) | 2011-09-08 | 2012-08-08 | Method and apparatus for measuring optical fiber asymmetry time delay |
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| CN102546009A (en) * | 2012-01-17 | 2012-07-04 | 华为技术有限公司 | Optical fiber symmetry detecting method and device |
| WO2012095043A3 (en) * | 2012-02-21 | 2013-01-24 | 华为技术有限公司 | Method and device for compensating for time path |
| WO2013034041A1 (en) * | 2011-09-08 | 2013-03-14 | 烽火通信科技股份有限公司 | Method and apparatus for measuring optical fiber asymmetry time delay |
| CN103299582A (en) * | 2012-11-15 | 2013-09-11 | 华为技术有限公司 | Delay compensation method and device |
| WO2014079343A1 (en) * | 2012-11-20 | 2014-05-30 | 中兴通讯股份有限公司 | Synchronization system, method and master/slave optical module device for detecting asymmetry of optical fiber |
| CN103840877A (en) * | 2012-11-23 | 2014-06-04 | 中兴通讯股份有限公司 | Time synchronization device and method for automatically detecting optical fiber asymmetry |
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| CN112436914A (en) * | 2019-08-26 | 2021-03-02 | 烽火通信科技股份有限公司 | Method and system for protecting master and slave 5G ultrahigh-precision clocks |
| CN117938260A (en) * | 2024-03-25 | 2024-04-26 | 江苏时同源科技有限公司 | Fault detection system based on optical fiber network high-precision time service system |
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| CN101630971A (en) * | 2008-07-14 | 2010-01-20 | 中兴通讯股份有限公司 | Method and system for measuring delay dynamically by optical fiber |
| CN101771467A (en) * | 2009-01-05 | 2010-07-07 | 华为技术有限公司 | Method for mesuring asymmetry of optical fiber, device and system |
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| WO2013034041A1 (en) | 2013-03-14 |
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