CN102299740A - Optical Time Domain (OTD) detection method and Optical Line Terminal (OLT) - Google Patents
Optical Time Domain (OTD) detection method and Optical Line Terminal (OLT) Download PDFInfo
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- CN102299740A CN102299740A CN2011102413448A CN201110241344A CN102299740A CN 102299740 A CN102299740 A CN 102299740A CN 2011102413448 A CN2011102413448 A CN 2011102413448A CN 201110241344 A CN201110241344 A CN 201110241344A CN 102299740 A CN102299740 A CN 102299740A
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Abstract
The invention provides an OLT and an Optical Time Domain (OTD) detection method. The Optical Line Terminal is provided with an Optical Time Domain detection function module used for initiating Optical Time Domain detection according to a received command, and reporting at least one data in a group of collected test data and test data after processing. According to the invention, the OLT is enabled with a light path detection function, so that an EMS (Element Management System) can detect an optical network without going through an additional server and an expensive OTDR (Optical Time Domain Reflector) apparatus.
Description
Technical field
The present invention relates to optical fiber communication on-line testing field, specifically, relate to a kind of optical line terminal of built-in light path measuring ability and method that the light time territory is detected used
Background technology
Fast development and cost degradation and requirements of green environmental protection along with Fibre Optical Communication Technology make communication network from core net, and metropolitan area network is to Access Network and Fiber to the home and light advances copper and moves back, and all using optical fiber to form network has become basic Consensus.The laying of a large amount of fiber optic networks and settle after, the operation of network and safeguarding has become one of problem that operator pays close attention to most, the particularly detection of fibre circuit and fault location.
Existing main mode is an off-line, see shown in Figure 1, promptly outside equipment, settle a light time territory detector (Optical Time Domain Reflector, be called for short OTDR) by wave multiplexer OTDR is detected photosyntheticly to go into trunk optical fiber and detect, because the equipment of OTDR is relatively more expensive, it is also not too convenient to operate, and patch also has certain influence to business at every turn, so operator's O﹠M cost is higher.
Summary of the invention
The technical problem to be solved in the present invention provides the method for a kind of OLT and light time territory detection, so that OLT itself possesses the function that OTDR detects.
In order to solve the problems of the technologies described above, the invention provides a kind of optical line terminal, wherein, a built-in light time territory measuring ability module,
Territory measuring ability module of described light time is used for according to the order that receives, initiates the light time territory and detects, report the test data that collects and handle after test data at least one.
Further, above-mentioned optical line terminal also has following characteristics: territory measuring ability module of described light time comprises:
Control module, be used to receive described order after, carry out light time territory test initialization, send test instruction to test module then;
Test module, be used to receive described test instruction after, the test signal that emission light time territory is detected;
Data acquisition module is used for after described test module emissioning testing signal, receives the test data that the light time territory is detected, and sends the test data that receives to data processing module;
Described data processing module is used for the test data that receives is carried out preliminary treatment, obtains reflecting the preprocessed data of fiber failure point and the relation of fiber distance, reports described preprocessed data then.
Further, above-mentioned optical line terminal also has following characteristics:
Described data processing module carries out preliminary treatment to described test data and comprises, with averaging of the test data processing that repeatedly collects or carry out orthogonal processing.
Further, above-mentioned optical line terminal also has following characteristics:
Described data processing module carries out also being used for after the preliminary treatment, analyzes the fiber failure point according to preprocessed data, reports the data after the analysis then, perhaps reports data and described preprocessed data after the analysis.
Further, above-mentioned optical line terminal also has following characteristics: described optical line terminal also comprises: data interface module,
Territory measuring ability module of described light time is to report Element management system by at least one with the test data that collects and in the test data after handling of described data interface module.
In order to address the above problem, the method that the present invention also provides territory of a kind of light time to detect comprises:
Optical line terminal is initiated the light time territory according to the order that receives and is detected;
Report the test data that collects and handle after test data at least one.
Further, said method also has following characteristics: territory of described initiation light time is detected and is comprised:
After carrying out light time territory test initialization, the test signal that emission light time territory is detected;
Receive the test data that the light time territory is detected, described test data is carried out preliminary treatment, obtain reflecting the preprocessed data of the relation of fiber failure point and fiber distance.
Further, said method also has following characteristics: describedly described reflected signal data are carried out preliminary treatment comprise:
With averaging of the test data processing that repeatedly collects or carry out orthogonal processing.
Further, said method also has following characteristics: described described reflected signal data are carried out preliminary treatment after, also comprise:
Analyze the fiber failure point according to preprocessed data.
To sum up, the invention provides the method that a kind of OLT and light time territory are detected, can make OLT itself have the function that light path detects, network element EMS does not need by other server and expensive OTDR instrument optical-fiber network to be detected like this.
Description of drawings
Fig. 1 is the structural representation that the fiber fault of passive optical network of prior art detects;
Fig. 2 is the schematic diagram of the OLT of the embodiment of the invention;
Fig. 3 is the flow chart of the method that detects of the light time territory of the embodiment of the invention;
Fig. 4 is for carrying out mutual flow chart between the EMS of the embodiment of the invention and the OLT.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Main purpose of the present invention is that existing OLT (optical line terminal) is carried out corresponding transformation, it is had optical-fiber network is carried out light path detection and processing capacity, reduces to minimum to the interference of existing business simultaneously.
Embodiment one
In order to increase the new function that optical fiber detects, OLT is except original business function, needing increases the requirement that a series of new functional modules reach the OTDR function, and Fig. 2 has shown these new functional modules and relation between them and whole passive optical network optical fiber testing flow chart.At first the function of these modules is described one by one below, then the workflow between them is set forth one by one.
As shown in Figure 2, the OLT of present embodiment comprises: data interface module and OTDR module, described OTDR module comprises: control module, test module, data acquisition module and data processing module.
Data interface module, be responsible for OLT and Element management system (Element Management System, abbreviation EMS) the contact between about the OTDR matters, promptly accept the dependent instruction that EMS issues, and instruction passed to the relevant Executive Module of OLT, and the OTDR test result of OLT or the state of command execution are passed to EMS.
Because OLT already has the interactive interface with EMS, so this data interface module can be to increase a kind of new business model in original interface module business, so this data interface module can be a kind of software module.
Control module: major function is to carry out the order of data interface module, start the order that OTDR detects when receiving, it is used to the initialization of the detection of beginning OTDR to prepare, for example open the hardware device of the corresponding test of OTDR, need sometimes to window (promptly interrupt existing professional a period of time) creates conditions etc. for test; When receiving the order of closing the OTDR detection, begin to close the hardware device of the corresponding test of OTDR; After the test data that receives OTDR, test data is reported data interface module.This module can be a kind of software module, promptly increases a kind of new business and get final product in original OLT business module or MAC (medium access control) chip.
Test module: its major function is the test signal of emission OTDR, after its open command according to control module is finished the test preparation, and emissioning testing signal.
As: test module can add a modulation signal by a small margin on original transmitting, as for GPON/EPON (gigabit passive optical network/ethernet passive optical network) system, can reuse its descending light (1490nm), because operation continuously when descending light moves in system, therefore being different from traditional OTDR detects, the low-frequency modulation signal that can in continuous descending light, add one 5%～10% former smooth amplitude, measure the reflection of its low frequency signal, simultaneously low frequency signal is scanned, obtain a series of frequency signals like this, pass through the conversion of anti-FFT (fast Fourier transform) again, can obtain the OTDR signal on time domain.The advantage of this method is not need reflector is changed, and deficiency is that distorted signals is bigger.
For signal to noise ratio and the confidence level that increases signal also can increase a reflector separately, the test signal of launching OTDR specially, as: increase the optical transmitting set of 1310nm, be used for launching the detection signal of OTDR specially; Because 1310nm is consistent with the up optical wavelength of GPON/EPON, therefore between the OTDR detection period, must closeall uplink service, what promptly guarantee to test windows the time, so this test module can realize by software, also can realize by hardware.
Also can increase the optical transmitting set and the optical receiver of a three-wavelength in former optical module, carry out light path and detect, such benefit is not influence business, can carry out light path and detect when service operation.
Data acquisition module: its major function is the requirement according to test module, begin to start the reflected signal (being test data) that receives OTDR, and give data processing module result transmission simultaneously, this data acquisition module can be reused original optical receiver, also can increase a receiver, the special reflection analog signal that receives OTDR, thus this data acquisition module can realize by software, also can realize by hardware.
Data processing module: its major function is to carry out a preliminary treatment according to the test data that receives, since the signal of OTDR a little less than, test and image data need be carried out repeatedly, data processing module can average the removal noise to these data, the also orthogonal processing that can be correlated with to quadrature multiple-pulse (as Gray's sequence) is to improve signal to noise ratio.
The operation principle and the testing process of these modules are as follows:
At first, EMS sends the order of optical fiber being carried out fault detect to the OLT of correspondence;
After data interface module among the OLT is received the order of fault detect, send the instruction of opening the OTDR detection to control module;
The preparation that control module is correlated with to the detection of OTDR, as open relevant testing equipment or module, or optical-fiber network windowed handle or the like, after preparation finishes, send the order of testing to test module;
After test module is received test command, send the OTDR test signal, the data acquisition module BOB(beginning of block) receives the reflected signal of OTDR test simultaneously, and a reflected signal of collecting is transferred to data processing module, since reflected signal a little less than, test and gatherer process need repeated multiple times, general thousands of times to up to ten thousand times;
At last, data processing module averages these data or relevant processing draws OTDR preliminary treatment result, can reflect the relation of optical fiber abnormity point or fault point and fiber distance.These OTDR data processing data are issued data interface module with reference format with the preliminary treatment result, issue EMS by data interface module with the form of report.
After EMS receives report, carry out dependent evaluation, as think defective after, will send again the order of test to OLT, repeat above process; As think qualified, then send the order of closing test to OLT, after data interface module is received and is closed test command, transmit the order of closing to control module, control module is closed relevant testing equipment, recovers normal service condition, and the information that task is finished is sent to data interface module in the back that finishes, data interface module is passed to EMS to relevant information, and the expression task is finished.
Embodiment two
What present embodiment and embodiment one were different is that OLT has also increased a new function, promptly in five modules in embodiment one, the data processing module has been increased the function of the OTDR data being carried out aftertreatment, promptly the data of former single treatment are analyzed again, fiber failure point or abnormity point are completely put in order out, then this analysis result and original preprocessed data are issued data interface module together, be transmitted to EMS then, can reduce the work of EMS like this, improve operating efficiency.
The operation principle and the testing process of these modules of present embodiment are as follows:
At first, EMS sends the order of optical fiber being carried out fault detect to the OLT of correspondence;
After data interface module among the OLT is received order, send the order of opening the OTDR detection to control module;
After control module receives order, the relevant preparation of a series of OTDR test initialization is carried out in the detection of OTDR, for example, open relevant testing equipment or module, or optical-fiber network windowed handle or the like, after preparation finishes, send the instruction of testing to test module;
After test module is received order, send the OTDR test signal, the data acquisition module BOB(beginning of block) receives the reflected signal that OTDR detects simultaneously, and the reflected signal of collecting is transferred to data processing module.Since reflected signal a little less than, test and gatherer process need repeated multiple times, general thousands of times to up to ten thousand inferior.
At last, data processing module averages these reflected signal data or relevant processing draws OTDR preliminary treatment result, can reflect the relation of optical fiber abnormity point or fault point and fiber distance.The aftertreatment that these data are deepened is simultaneously promptly carried out data analysis to the result, and all abnormity point or fault point are all put in order out, then single treatment result and twice result is issued EMS by the EMS interface module with the form of report.
After EMS receives report, carry out dependent evaluation, as think defective after, to send the order of test again to OLT, repeat above process, as think qualified, to send the order of closing test to OLT, after data interface module was received order, to the order that the control module transmission is closed, control module was closed relevant testing equipment, recover normal service condition, send the signal that task is finished to data interface module after finishing, data interface module is passed to EMS to relevant information, and the expression task is finished.
Fig. 3 is the flow chart of the method that detects of the light time territory of the embodiment of the invention, and as shown in Figure 3, the method for present embodiment comprises step:
S10, OLT initiate the light time territory according to the order that receives and detect;
S20, report the test data that collects and handle after test data at least one.
Wherein, described initiation light time territory detection can comprise following step:
After carrying out light time territory test initialization, the test signal that emission light time territory is detected;
Receive the test data that the light time territory is detected, described test data is carried out preliminary treatment, obtain reflecting the preprocessed data of the relation of fiber failure point and fiber distance.
Wherein, describedly described reflected signal data carried out preliminary treatment comprise:
With averaging of the test data processing that repeatedly collects or carry out orthogonal processing.
Further, described reflected signal data are carried out preliminary treatment after, also comprise:, analysis result is reported EMS according to described preprocessed data analysis of failure point.
Here brief description once, the flow process of the basic data transfer between EMS and the OLT as shown in Figure 4, EMS sends the order that starts test; OLT replys the relevant report of test, sends the order of closing test after the EMS assessment, after OLT finishes, sends the answer that is finished.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Below only be the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. an optical line terminal is characterized in that, a built-in light time territory measuring ability module,
Territory measuring ability module of described light time is used for according to the order that receives, initiates the light time territory and detects, report the test data that collects and handle after test data at least one.
2. optical line terminal as claimed in claim 1 is characterized in that: territory measuring ability module of described light time comprises:
Control module, be used to receive described order after, carry out light time territory test initialization, send test instruction to test module then;
Test module, be used to receive described test instruction after, the test signal that emission light time territory is detected;
Data acquisition module is used for after described test module emissioning testing signal, receives the test data that the light time territory is detected, and sends the test data that receives to data processing module;
Described data processing module is used for the test data that receives is carried out preliminary treatment, obtains reflecting the preprocessed data of fiber failure point and the relation of fiber distance, reports described preprocessed data then.
3. optical line terminal as claimed in claim 2 is characterized in that:
Described data processing module carries out preliminary treatment to described test data and comprises, with averaging of the test data processing that repeatedly collects or carry out orthogonal processing.
4. optical line terminal as claimed in claim 2 is characterized in that:
Described data processing module carries out also being used for after the preliminary treatment, analyzes the fiber failure point according to preprocessed data, reports the data after the analysis then, perhaps reports data and described preprocessed data after the analysis.
5. as each described optical line terminal of claim 1-4, it is characterized in that: described optical line terminal also comprises: data interface module,
Territory measuring ability module of described light time is to report Element management system by at least one with the test data that collects and in the test data after handling of described data interface module.
6. method that the light time territory is detected comprises:
Optical line terminal is initiated the light time territory according to the order that receives and is detected;
Report the test data that collects and handle after test data at least one.
7. method as claimed in claim 6 is characterized in that: described initiation light time territory is detected and is comprised:
After carrying out light time territory test initialization, the test signal that emission light time territory is detected;
Receive the test data that the light time territory is detected, described test data is carried out preliminary treatment, obtain reflecting the preprocessed data of the relation of fiber failure point and fiber distance.
8. method as claimed in claim 7 is characterized in that: describedly described reflected signal data are carried out preliminary treatment comprise:
With averaging of the test data processing that repeatedly collects or carry out orthogonal processing.
9. as claim 7 or 8 described methods, it is characterized in that: described described reflected signal data are carried out preliminary treatment after, also comprise:
Analyze the fiber failure point according to preprocessed data.
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| CN102761366A (en) * | 2012-07-10 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical line terminal optical terminal used in 10 Gigabit passive optical network |
| CN109495165A (en) * | 2018-10-23 | 2019-03-19 | 长飞光纤光缆股份有限公司 | A kind of OTDR test method based on industry internet platform |
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| US20050271384A1 (en) * | 2004-06-02 | 2005-12-08 | Lee Han H | Optical transmission line monitoring system using a gain clamped optical amplifier |
| CN102104423A (en) * | 2009-12-22 | 2011-06-22 | 中兴通讯股份有限公司 | Fault detection method and system for multi-branch PON (Passive Optical Network) |
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Application publication date: 20111228 |