CN108337046B - FTTx terminal line tester - Google Patents
FTTx terminal line tester Download PDFInfo
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- CN108337046B CN108337046B CN201810464146.XA CN201810464146A CN108337046B CN 108337046 B CN108337046 B CN 108337046B CN 201810464146 A CN201810464146 A CN 201810464146A CN 108337046 B CN108337046 B CN 108337046B
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- 230000003287 optical effect Effects 0.000 claims abstract description 97
- 238000012545 processing Methods 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims description 16
- 239000004065 semiconductor Substances 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 abstract description 22
- 238000004891 communication Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 208000032369 Primary transmission Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000003780 insertion Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses an FTTx terminal line tester, relates to optical fiber communication measuring equipment, and aims to solve the problems that the traditional detecting equipment is not suitable for three-in-one optical fiber communication and affects the using effect, and the technical scheme is as follows: the optical line terminal comprises two wavelength division multiplexers (WDM A) and two wavelength division multiplexers (WDM B), wherein the OLT end is connected with the WDM A through the WDM A, the ONT is connected with the WDM B through the WDM A, the number of the photoelectric detectors is four, the WDM A and the WDM B are respectively connected with two photoelectric detectors, one photoelectric detector among the two photoelectric detectors connected with the WDM A is used for detecting video signals, and the signal of the output end of the photoelectric detector is connected with the data processing module. The FTTx terminal line tester can be suitable for three-in-one optical fibers, can measure the FTTx user terminal more conveniently, and can directly determine the fault cause and the fault position.
Description
Technical Field
The invention relates to optical fiber communication measuring equipment, in particular to an FTTx terminal line tester.
Background
Optical fiber communication is a communication mode in which information is transmitted in an optical fiber by using light waves, and is called laser-optical fiber communication because the light waves in optical fiber communication are mainly lasers due to the remarkable advantages of high directivity, high coherence, high monochromaticity and the like of lasers. The principle of optical fiber communication is as follows: at the transmitting end, the transmitted information (such as voice) is firstly changed into an electric signal, and then modulated onto a laser beam emitted by a laser, so that the intensity of light changes along with the amplitude (frequency) change of the electric signal, and the electric signal is transmitted through an optical fiber; at the receiving end, the detector receives the optical signal and converts it into an electric signal, and the original information is recovered after demodulation. Optical fiber communication has become a primary transmission means for modern communication networks.
In 2012, the industry and informatization part is the requirements of accelerating broadband China construction and accelerating popularization of optical fiber home-entering, the optical fiber home-entering construction is promoted, and the schemes for measuring the FTTx user end are basically concentrated in two types of instruments, namely a standard optical power meter and a PON optical power meter, since the formal implementation of the national standard of 4 months and 1 day of 2-item national standard of the engineering design specification of optical fiber home communication facilities in residential areas and residential buildings and the engineering construction and acceptance specification of optical fiber home communication facilities in residential areas and residential buildings, which are compiled by communication development organizations of the industry and informatization part.
At present, with the development of communication technology and society, optical fiber communication gradually improves, and traditional check out test set can't be suitable for detecting video signal wherein, and the operation is loaded down with trivial details relatively, influences the result of use, therefore need to propose a new scheme to solve this problem.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the FTTx terminal line tester which can be suitable for three-in-one optical fiber communication, is more convenient to operate and can directly determine the fault reason and the fault position.
The technical aim of the invention is realized by the following technical scheme: the utility model provides a FTTx terminal circuit tester, includes beam splitter A, wavelength division multiplexer and photoelectric detector, wavelength division multiplexer is two, and signal connection is in two low transmission ends of beam splitter A respectively, two wavelength division multiplexer is wavelength division multiplexer A and wavelength division multiplexer B respectively, and the OLT end passes through the low transmission end signal connection of beam splitter A is in wavelength division multiplexer A, ONT passes through the low transmission end signal connection of beam splitter A is in wavelength division multiplexer B, the photoelectric detector is four, wavelength division multiplexer A and wavelength division multiplexer B signal connection are two photoelectric detector respectively, and signal connection is in have a photoelectric detector to be used for detecting the video signal in two photoelectric detector of wavelength division multiplexer A, photoelectric detector output signal connection is in data processing module.
By adopting the technical scheme, when in use, a user only needs to connect the optical splitter A in series to the straight-through optical channels of the ONT end and the OLT end, and then can detect the optical fiber link by utilizing each photoelectric detector, so that the use is relatively convenient; meanwhile, the photoelectric detector for detecting the video signal is arranged, so that the three-in-one optical fiber communication device can be suitable for three-in-one optical fiber communication.
The invention is further provided with: an optical splitter B is connected in series between the optical splitter A and the wavelength division multiplexer A, and the optical splitter B is connected with a semiconductor laser in a signal manner.
By adopting the technical scheme, the return loss test light path can be formed by utilizing the semiconductor laser to be matched with other structures of the invention, and the ONT-OLT link can be more comprehensively detected by utilizing the insertion return loss test mode so as to detect the problem of the optical fiber link.
The invention is further provided with: the beam splitter A has a beam splitting ratio of 50:50-97:3, and the beam splitter B has a beam splitting ratio of 30:70-70:30.
The invention is further provided with: the data processing module comprises a signal amplifier, an A/D converter connected with the signal amplifier, a processing unit connected with the A/D converter in a data way and a memory connected with the processing unit in a data way, and comprises an external data input and output end.
By adopting the technical scheme, the measured result can be stored in the memory after being processed by the processing unit, and a subsequent user can be connected with other auxiliary equipment to further process the data.
The invention is further provided with: the data processing module comprises a digital display unit, and the digital display unit is connected with the processing unit.
By adopting the technical scheme, the data processed by the processing unit can be displayed by the digital display unit, so that a user can quickly obtain a detection result and find out the link problem.
The invention is further provided with: the four photoelectric detectors are respectively a photoelectric detector A, a photoelectric detector B, a photoelectric detector C and a photoelectric detector D, the photoelectric detector A and the photoelectric detector B are in signal connection with the wavelength division multiplexer A, the photoelectric detector B is used for detecting video signals, the photoelectric detector C and the photoelectric detector D are in signal connection with the wavelength division multiplexer B, the data processing module is provided with a power detection mode, the power detection mode is at least 6, and the data processing module comprises,
the optical power P1, the optical power P1 of the ONT end uplink signal is measured by the photoelectric detector D through the optical splitter A and the wavelength division multiplexer B in sequence;
the optical power P2, the downlink signal of the OLT end sequentially passes through the optical splitter A and the ONT end, is reflected at the ONT end, sequentially passes through the optical splitter A and the wavelength division multiplexer B, and is measured by the photoelectric detector C;
the optical power P3, the downlink signal of the OLT end sequentially passes through the optical splitter A, the optical splitter B and the wavelength division multiplexer A, and the optical power P3 is measured by the photoelectric detector A;
the optical power P4, the optical signal emitted by the semiconductor laser sequentially passes through the end of the optical splitter B and the end of the optical splitter A, OLT, is reflected at the end of the OLT, sequentially passes through the optical splitter A, the optical splitter B and the wavelength division multiplexer A, and is measured by the photoelectric detector A to obtain the optical power P4; the optical power P5, the optical signal emitted by the semiconductor laser sequentially passes through the optical splitter B, the optical splitter A and the wavelength division multiplexer B, and the optical power P5 is measured by the photoelectric detector C;
the optical power P6, the downlink video signal of the OLT end sequentially passes through the optical splitter A, the optical splitter B and the wavelength division multiplexer A and is measured by the photoelectric detector B to obtain the optical power P6;
the data processing module obtains a detection result according to a preset logic table
By adopting the technical scheme, the data processing module can obtain the detection result by utilizing the power detection mode and processing the detection result by matching with a preset logic table.
In summary, the invention has the following beneficial effects: the method comprises the steps that a beam splitter A is arranged, the beam splitter A is respectively connected with a beam splitter B and a wavelength division multiplexer B, the beam splitter B is connected with the wavelength division multiplexer A and a semiconductor laser, the wavelength division multiplexer A is connected with two photoelectric detectors, and one photoelectric detector is used for detecting video signals; the wavelength division multiplexer B is also connected with two photoelectric detectors; the photoelectric detector is connected with a data processing module; when in use, a user only needs to connect the optical splitter A in series to the straight-through optical paths of the ONT and the OLT, then the link can be detected, and the use is convenient; the photoelectric detector for detecting the video signal is arranged, so that the three-in-one network can be adapted; meanwhile, the semiconductor laser is arranged, so that a return loss test light path can be formed by matching with other structures, and the power detection mode in the step 6 is arranged, so that the reasons for the occurrence of the link problem can be more comprehensively tested, the position of the problem can be found, and the use is convenient for a user.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention, showing the structure of the present invention except for a data processing module;
fig. 2 is a schematic structural diagram of the present invention, mainly used for showing the structure of the data processing module.
In the figure: 2. a beam splitter A; 4. a photodetector A; 5. a photodetector B; 6. a wavelength division multiplexer A; 7. a beam splitter B; 8. a semiconductor laser; 9. a wavelength division multiplexer B; 10. a photodetector C; 11. a photodetector D; 12. a data processing module; 121. amplifying signals; 122. an A/D converter; 123. a processing unit; 124. a memory; 125. and a digital display unit.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
In this embodiment, the ONT end is a user end, such as a cat; the OLT end is one end connected to the telecommunication office; the high-transmittance end is the end with stronger light transmittance, and the low-transmittance end is the end with weaker light transmittance.
The FTTx termination line tester, referring to fig. 1, includes an optical splitter A2, a wavelength division multiplexer, and a photodetector.
The two wavelength division multiplexers are respectively a wavelength division multiplexer A6 and a wavelength division multiplexer B9, and the two wavelength division multiplexers are respectively connected to the two low-transmission ends of the optical splitter A2.
In use, the optical splitter A2 is connected in series between the ONT end and the OLT end, the OLT end is connected to the wavelength division multiplexer A6 by the low-transmission end signal of the optical splitter A2, and the ONT is connected to the wavelength division multiplexer B9 by the low-transmission end signal of the optical splitter A2.
The number of the photodetectors is four, namely a photodetector A4, a photodetector B5, a photodetector C10 and a photodetector D11. The photoelectric detector A4 and the photoelectric detector B5 are respectively connected with the wavelength division multiplexer A6; the photodetectors C10 and D11 are respectively signaled to the wavelength division multiplexer B9.
Further, the photo detector A4 and the photo detector C10 are 1490nm photo detectors; the photoelectric detector B5 is a 1550nm photoelectric detector, namely a photoelectric detector for detecting videos; the photodetector D11 is a 1310nm photodetector. The four photodetectors all contain filters to ensure the use effect.
Since the photodetector B5 is a 1550nm photodetector, the invention can be applied to three-in-one optical fiber communication.
Referring to fig. 1 and 2, in order to obtain the detection result, the photodetector is also signal-connected to a data processing module 12 for analyzing and processing the measured signal.
The data processing module 12 includes a signal amplifier 121, an a/D converter 122, a processing unit 123, and a memory 124, which are sequentially connected. The measured result is a/D converted and then sent to the processing unit 123 for processing, and then stored in the memory 124. The processing unit 123 is a unit having data processing capability such as an MCU.
The data processing module 12 includes an external data input/output end for assisting the user to externally connect other devices.
Furthermore, the data processing module 12 further includes a digital display unit 125, and the digital display unit 125 is connected to the processing unit 123, so that a digital display screen with graphic and text display functions commonly used in the market can be selected. The data processing result of the processing unit 123 can be displayed by the digital display unit 125 for the user to read.
Referring to fig. 1 and 2, in order to enable a worker to conveniently find out a problem and a position where the problem is located in the ONT and OLT links in actual use, a splitter B7 is connected in series between a splitter A2 and a wavelength division multiplexer A6, the splitter B7 is further connected with a semiconductor laser 8 in a signal manner, and the semiconductor laser 8 is further connected to a processing unit 123 so that a user can control the same.
Meanwhile, 6 power detection modes are set in the processing unit 123, and a preset logic table is stored. The 6 power detection modes are respectively:
the optical power P1, the ONT end uplink signal sequentially passes through the optical splitter A2 and the wavelength division multiplexer B9, and the optical power P1 is measured by the photoelectric detector D11; simply labeled ONT end → 2 → 9 → 11.
The optical power P2, the downlink signal of the OLT end sequentially passes through the optical splitter A2 and the ONT end, is reflected at the ONT end, sequentially passes through the optical splitter A2 and the wavelength division multiplexer B9, and is measured by the photoelectric detector C10; the simple label is OLT-2-ONT end, and the simple label is reflected back to 2-9-10 at the ONT end.
The optical power P3, the downlink signal of the OLT end sequentially passes through the optical splitter A2, the optical splitter B7 and the wavelength division multiplexer A6, and the optical power P3 is measured by the photoelectric detector A4; simply marked as OLT end- & gt 2- & gt 7- & gt 6- & gt 4
The optical power P4, the optical signal emitted by the semiconductor laser 8 sequentially passes through the optical splitter B7, the optical splitter A2 and the OLT end, is reflected at the OLT end, sequentially passes through the optical splitter A2, the optical splitter B7 and the wavelength division multiplexer A6, and the optical power P4 is measured by the photoelectric detector A4; the simple sign is 8-7-2-the OLT end, and is reflected back to 2-7-6-4 at the OLT end.
The optical power P5, the optical signal emitted by the semiconductor laser 8 sequentially passes through the beam splitter B7, the beam splitter A2 and the wavelength division multiplexer B9, and the optical power P5 is measured by the photoelectric detector C10; the simple label is 8-7-2-9-10.
The optical power P6, the downlink video signal of the OLT end sequentially passes through the optical splitter A2, the optical splitter B7 and the wavelength division multiplexer A6, and the optical power P6 is measured by the photoelectric detector B (5); the simple sign is OLT end- & gt 2- & gt 7- & gt 6- & gt 5.
The preset logic table is as follows:
the optical powers P1-P5 are used for judging the link condition, and P6 is only used for measuring the downlink VIDEO power value and does not participate in judgment.
The beam splitting ratio of the beam splitter A2 is 50:50-97:3, and the beam splitting ratio of the beam splitter B7 is 30:70-70:30. The data set is the best value measured by my department at present, and loss and the like can be reduced to the minimum.
The using process comprises the following steps: the user connects the optical splitter A2 in series to the straight-through optical path between the ONT end and the OLT end, then starts the invention, sequentially detects the optical path by using 6 power detection modes according to actual conditions, and judges the cause of the problem and the position of the problem according to a preset logic table.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (4)
1. The utility model provides a FTTx terminal circuit tester, includes beam splitter A (2), wavelength division multiplexer and photoelectric detector, its characterized in that: the optical line terminal is characterized in that two wavelength division multiplexers are respectively connected to two low-transmission ends of the optical splitter A (2) in a signal mode, the two wavelength division multiplexers are respectively a wavelength division multiplexer A (6) and a wavelength division multiplexer B (9), an OLT end is connected to the wavelength division multiplexer A (6) through low-transmission end signals of the optical splitter A (2), ONTs are connected to the wavelength division multiplexer B (9) through low-transmission end signals of the optical splitter A (2), the number of the photoelectric detectors is four, the two photoelectric detectors are respectively connected to the wavelength division multiplexer A (6) and the wavelength division multiplexer B (9) in a signal mode, one photoelectric detector is used for detecting video signals in the two photoelectric detectors connected to the wavelength division multiplexer A (6), and the output end signals of the photoelectric detectors are connected to the data processing module (12); a beam splitter B (7) is connected in series between the beam splitter A (2) and the wavelength division multiplexer A (6), and the beam splitter B (7) is connected with a semiconductor laser (8) in a signal manner; the four photoelectric detectors are respectively a photoelectric detector A (4), a photoelectric detector B (5), a photoelectric detector C (10) and a photoelectric detector D (11), the photoelectric detector A (4) and the photoelectric detector B (5) are in signal connection with a wavelength division multiplexer A (6), the photoelectric detector B (5) is used for detecting video signals, the photoelectric detector C (10) and the photoelectric detector D (11) are in signal connection with a wavelength division multiplexer B (9), the data processing module (12) is provided with a power detection mode, the power detection mode is at least 6, the power detection mode comprises an optical power P1, an ONT end uplink signal sequentially passes through a beam splitter A (2) and a wavelength division multiplexer B (9), and the optical power P1 is measured by the photoelectric detector D (11); the optical power P2, the downlink signal of the OLT end sequentially passes through the optical splitter A (2) and the ONT end, is reflected at the ONT end, sequentially passes through the optical splitter A (2) and the wavelength division multiplexer B (9), and is measured by the photoelectric detector C (10); the optical power P3, the downlink signal of the OLT end sequentially passes through the optical splitter A (2), the optical splitter B (7) and the wavelength division multiplexer A (6), and the optical power P3 is measured by the photoelectric detector A (4); the optical power P4, the optical signal emitted by the semiconductor laser (8) sequentially passes through the optical splitter B (7), the optical splitter A (2) and the OLT end, is reflected at the OLT end, sequentially passes through the optical splitter A (2), the optical splitter B (7) and the wavelength division multiplexer A (6), and the optical power P4 is measured by the photoelectric detector A (4); the optical power P5, the optical signal emitted by the semiconductor laser (8) sequentially passes through the beam splitter B (7), the beam splitter A (2) and the wavelength division multiplexer B (9), and the optical power P5 is measured by the photoelectric detector C (10); the optical power P6, the downlink video signal of the OLT end sequentially passes through the optical splitter A (2), the optical splitter B (7) and the wavelength division multiplexer A (6), and the optical power P6 is measured by the photoelectric detector B (5); the data processing module (12) obtains a detection result according to a preset logic table.
2. The FTTx termination line tester of claim 1, wherein: the beam splitting ratio of the beam splitter A (2) is 50:50-97:3, and the beam splitting ratio of the beam splitter B (7) is 30:70-70:30.
3. The FTTx termination line tester according to claim 2, wherein: the data processing module (12) comprises a signal amplifier (121), an A/D converter (122) connected with the signal amplifier (121), a processing unit (123) connected with the A/D converter (122) in a data mode and a memory (124) connected with the processing unit (123) in a data mode, and the data processing module (12) comprises an external data input end and an external data output end.
4. The FTTx termination line tester of claim 3, wherein: the data processing module (12) comprises a digital display unit (125), and the digital display unit (125) is connected with the processing unit (123).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810464146.XA CN108337046B (en) | 2018-05-15 | 2018-05-15 | FTTx terminal line tester |
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| CN201810464146.XA CN108337046B (en) | 2018-05-15 | 2018-05-15 | FTTx terminal line tester |
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| CN108337046A CN108337046A (en) | 2018-07-27 |
| CN108337046B true CN108337046B (en) | 2023-10-24 |
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| CN110267280B (en) * | 2019-06-03 | 2024-04-02 | 创信测试技术(深圳)有限公司 | Communication signal tester and communication signal testing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932056A (en) * | 2012-11-12 | 2013-02-13 | 烽火通信科技股份有限公司 | Method and device for detecting optical signal performance and diagnosing fiber link fault |
| CN204993350U (en) * | 2015-08-05 | 2016-01-20 | 浙江天创信测通信科技有限公司 | Hand -held type PON optical power meter |
| CN206402230U (en) * | 2017-01-11 | 2017-08-11 | 上海嘉慧光电子技术有限公司 | Optical assembly, the detecting devices using the optical assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9379813B2 (en) * | 2013-08-07 | 2016-06-28 | Viavi Solutions Deutschland Gmbh | Testing a passive optical network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932056A (en) * | 2012-11-12 | 2013-02-13 | 烽火通信科技股份有限公司 | Method and device for detecting optical signal performance and diagnosing fiber link fault |
| CN204993350U (en) * | 2015-08-05 | 2016-01-20 | 浙江天创信测通信科技有限公司 | Hand -held type PON optical power meter |
| CN206402230U (en) * | 2017-01-11 | 2017-08-11 | 上海嘉慧光电子技术有限公司 | Optical assembly, the detecting devices using the optical assembly |
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Address after: 314400 building 1-2, No. 2, No. 128, double Road, Haining Economic Development Zone, Haining City, Jiaxing, Zhejiang Applicant after: Zhejiang Xinxi Communication Co.,Ltd. Address before: 314400 building 1-2, No. 2, No. 128, double Road, Haining Economic Development Zone, Haining City, Jiaxing, Zhejiang Applicant before: ZHEJIANG TIANCHUANG XINCE COMMUNICATION TECHNOLOGY Co.,Ltd. |
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