CN101567724B - Network situation detection system and method - Google Patents
Network situation detection system and method Download PDFInfo
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- CN101567724B CN101567724B CN2009101076153A CN200910107615A CN101567724B CN 101567724 B CN101567724 B CN 101567724B CN 2009101076153 A CN2009101076153 A CN 2009101076153A CN 200910107615 A CN200910107615 A CN 200910107615A CN 101567724 B CN101567724 B CN 101567724B
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Abstract
The invention embodiment discloses a network situation detection system. The network situation detection system includes a detection signal generating module, which is used for producing detection signal, and broadcasting the detection signal to the multi network units by the branching unit, receiving the reflected signal produced by the detection signal in the network line, and detecting the power value sequence of the reflected signal of the detection signal, wherein the detection signal includes a reference test signal and a first test signal; a waveform analysis module which is used for obtaining the power value sequence of the reflected signal of the first branch circuit link, according to reference power value sequence of the reflected signal of the reference test signal as well as the first power value sequence of the reflected signal of the first test signal; as well as a filter, which is used for filtering signal through the first branch circuit link. The network situation detection system disclosed by the invention embodiment can obtain the power value sequence of the reflected signal of the branch circuit link, and detect the situation of the network circuit.
Description
Technical field
The present invention relates to network technology, especially a kind of network situation detection system and method.
Background technology
Along with society and expanding economy, the entering huge numbers of families that slowly the trend that will become network application that Fiber to the home, corresponding passive optical network (Passive Optical Network is called for short PON) technology will be slowly.Further, be equipped with the PON of optical branching device can realize a little to the transfer of data of multiple spot, a large amount of optical cable input that has been exactly this configuration saves has reduced the cost of Virtual network operator, has received the favor of most of operator.But because optical fiber has flimsy characteristics, locate the line fault among the PON how in time, exactly, also perplexing Virtual network operator always.
In general, the detection for the line fault in the fiber optic network all is to carry out through optical time domain reflectometer (optical time domain reflectormeter is called for short OTDR).Concrete, OTDR launches light pulse signal from an end of tested optical fiber to optical fiber, because the communication process of light in optical fiber can produce rayleigh backscattering and Fresnel reflection, these scattered lights and reverberation can turn back to the OTDR test lead along optical fiber.OTDR draws out the trajectory diagram that is used for reacting optical fiber quality according to the size and the time of the light that returns.The user can judge the quality of diverse location optical fiber according to trajectory diagram.Utilize common OTDR can accurately locate the fault of simple optical fiber in the point-to-point topology; But for the structure of this point of PON to multiple spot; Because the link failure after the optical branching device can be superimposed, therefore can't distinguish fault appears at which, also can't be certain draw location of fault.
To sum up, be necessary to provide fault detect and the localization method of a kind of PON, to realize fault detect and location to the fiber optic network of putting multiple spot.
Summary of the invention
The embodiment of the invention discloses a kind of network situation detection system.Said network situation detection system comprises detection signal generating module, waveform analysis module and filter.Wherein, said filter is used for the signal through said first branch circuit link is carried out filtering; Said detection signal generating module is used to produce detection signal; Broadcast said detection signal through said splitter to said a plurality of NEs; Receive the reflected signal that said detection signal produces in network line; And detecting the power value sequence of the reflected signal of said detection signal, said detection signal comprises with reference to the test signal and first test signal; Said waveform analysis module; Be used for first power value sequence according to the reflected signal of the reference power value sequence of said reflected signal with reference to test signal and said first test signal, obtain said first branch circuit link reflected signal power value sequence wherein.
The embodiment of the invention also discloses a kind of network condition detection method.Said network condition detection method comprises generation with reference to test signal, and broadcasts to said a plurality of NEs with reference to test signal said through said splitter; Receive said reflected signal, and write down the reference power value sequence of said reflected signal with reference to test signal with reference to test signal; Produce first test signal, and said first test signal is broadcasted to said a plurality of NEs, and the wavelength of said first test signal is included in the filter wavelength of being located at the filter on said first branch circuit link through said splitter; Receive the reflected signal of said first test signal, and write down first power value sequence of the reflected signal of said first test signal; Obtain the power value sequence of the reflected signal of said first branch circuit link according to said reference power value sequence and said first power value sequence.
The embodiment of the invention also provides a kind of network system.Said network system comprises the network terminal; The splitter of communicating by letter and being connected with the said network terminal; And a plurality of NEs of communicating by letter and being connected through many branch circuit link and said splitter; Comprise first NE in said a plurality of NE, said first NE is communicated by letter with said splitter through first branch circuit link and is connected, and it is characterized in that; Said network system also comprises network situation detection system, and said network situation detection system comprises detection signal generating module, waveform analysis module and filter.Wherein, said filter is used for the signal through said first branch circuit link is carried out filtering; Said detection signal generating module is used to produce detection signal; Broadcast said detection signal through said splitter to said a plurality of NEs; Receive the reflected signal that said detection signal produces in network line; And detecting the power value sequence of the reflected signal of said detection signal, said detection signal comprises with reference to the test signal and first test signal; Said waveform analysis module; Be used for first power value sequence according to the reflected signal of the reference power value sequence of said reflected signal with reference to test signal and said first test signal; Obtain the power value sequence of the reflected signal of said first branch circuit link; With the foundation that the network condition as said first branch circuit link detects, wherein, the filter wavelength of said filter comprises the wavelength of said first test signal.
Disclosed network condition detection method and system in the embodiment of the invention; Send the test signal of different wave length through the detection signal generating module; And filter through the test signal of filter with branch circuit link to be tested; Can calculate the performance number of the reflected signal of branch circuit link to be tested through the power value of looking between the reflected signal, with the foundation that detects as network condition.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sketch map of the network situation detection system that the embodiment of the invention provided;
Fig. 2 is the sketch map according to the waveform trace 0 of the power loss drafting of the reflected signal of the reference test signal in the embodiment of the invention;
Fig. 3 is the sketch map according to the waveform trace 1 of the power loss drafting of the reflected signal of first test signal in the embodiment of the invention;
Fig. 4 is the sketch map of waveform trace of drafting first branch circuit link of the embodiment of the invention;
Fig. 5 is the sketch map of the waveform analysis module that the embodiment of the invention provided;
Fig. 6 is the sketch map of the network condition detection method of the embodiment of the invention;
Fig. 7 is the automatic matching method of the output port of NE that the embodiment of the invention provided and splitter.
Fig. 8 is the automatic matching method of the output port of NE that further embodiment of this invention provided and splitter.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Please with reference to Fig. 1, shown in Figure 1ly be the sketch map of the network situation detection system that the embodiment of the invention provided.The described network situation detection system of the embodiment of the invention is used for a little to the network system of multiple spot, said point to the network system of multiple spot comprise Network Termination #1 0, with the said network terminal the communicate by letter splitter 30 that is connected and a plurality of NEs 50 of communicating by letter and being connected through branch circuit link and said splitter 30.The network situation detection system that the embodiment of the invention provided comprises detection signal generating module 20, waveform analysis module 40 and a plurality of filter 60.
Said detection signal generating module 20 is used to produce multi-wavelength's detection signal; Through network line detection signal is sent to splitter 30; And the performance number of the reflected signal of the said detection signal that returns in the computing network circuit; As alternate embodiments, the good generating module 20 of said detection performance also can be according to the performance number drawing waveforms track of said reflected signal.In embodiments of the present invention, said point also comprises coupler 22 to the network system of multiple spot.Said coupler 22 joins with network line; Be used for the detection signal that detection signal generating module 20 produces is coupled to network line, wherein, in embodiments of the present invention; Said coupler 22 can be wavelength division multiplexer (Wavelength Division Multiplexer is called for short WDM).In other alternate embodiments, said coupler 22 can also adopt the splitter of 1:2, so that detection signal is coupled to the service signal that Network Termination #1 0 sends.In embodiments of the present invention, the wavelength of said test signal comprises λ 0, λ 1, λ 2... λ n (n is a natural number), and wherein said λ 0 is the reference test wavelength with reference to test signal.Certainly, if do not consider detection signal is sent with common service signal, also coupler can be set.
In embodiments of the present invention, said Network Termination #1 0 is ONT Optical Network Terminal (Optical Line Terminal is called for short OLT), and said NE 50 can be optical network unit (Optical Network Unit is called for short ONU).Accordingly, the networking circuit described in the embodiment of the invention is a fibre circuit.In other alternate embodiments, said Network Termination #1 0 also can be the terminal that other can be used for broadcast singal.
In embodiments of the present invention, said splitter 30 is an optical branching device, and in other alternate embodiments, said splitter 30 also can be other device or the equipment that can be used for signal multipath broadcast transmitted.
In embodiments of the present invention; Said detection signal generating module 20 can be optical time domain reflectometer (optical time domain reflectormeter; Be called for short OTDR); In other alternate embodiments, said detection signal generating module 20 also can be other instruments that can produce signal and receive reflected signal.In embodiments of the present invention, said detection signal generating module 20 was in two device entity with the waveform analysis module in 40 minutes, under the situation of needs, also can said detection signal generating module 20 be integrated with waveform analysis module 40.
Further; In other alternate embodiments; Said detection signal generating module 20 also can be to be located in the said Network Termination #1 0, thereby when detection signal generating module 20 produces detection signal, by Network Termination #1 0 said detection signal is converted into service signal and sends.
Said waveform analysis module 40 is used for calculating according to the performance number of the reflected signal of said detection signal the waveform trace of the line conditions that obtains the expression branch circuit link
Said a plurality of filter 60 is located at respectively on said many branch circuit link; Be used to stop the signal of respective wavelength on the branch circuit link that said a plurality of output port connect, to propagate; Concrete, said a plurality of filters 60 can be installed on the network line between said splitter 30 and the NE 50, can be installed in the said splitter 30 and corresponding with a plurality of output ports of said splitter 30 respectively, also can be installed in a side of NE 50.Said a plurality of filter 60 pairing a plurality of wavelength comprise Γ 1, Γ 2... Γ n (n is a natural number), wherein, and λ n=Γ n.
As optional embodiment, the network situation detection system that the embodiment of the invention provided can also comprise Surveillance center 80, is used for the test job of control detection signal generating module 20; Receiving locus is analyzed and process result; Network terminal command signal is accepted in communication between the maintenance and the network terminal; The final situation of fault location and the result that the optical splitter port matees automatically of showing provides human-computer interaction interface and external interface.
In practical application; At first; Detection signal generating module 20 is sent the reference test signal 0 that wavelength is λ 0, saidly is transparent for said a plurality of filters 60 with reference to test signal 0, that is to say; Saidly can pass through said a plurality of filters 60, and reach NE 50 with reference to test signal 0.Detection signal generating module 20 receives said reflected signal with reference to test signal each point in network line, and obtains the reference power value sequence of the reflected signal of said each point.In embodiments of the present invention, for the ease of observing, said detection signal generating module 20 can be according to the performance number drawing waveforms track of said reflected signal; Concrete; Consider the usage of trade, detection signal generating module 20 converts performance number into the power loss value earlier, and is concrete please with reference to formula:
This formula has reflected that the power of signal becomes the power loss dB that P1 produces from P0, and wherein, P1 is the performance number of reflected signal, is the value in the reference power value sequence here; P0 is a reference value, in embodiments of the present invention, owing to only need to understand the relative value of variable power, therefore can set arbitrarily as required in advance; 1L is the power loss value, and unit is dB.Certainly, understandablely be, because P0 be the value of setting in advance, so the power loss that obtains here is a relative value.
Please with reference to Fig. 2; Fig. 2 is the sketch map according to the waveform trace of drawing with reference to the power loss of the reflected signal of test signal 0; It has reflected the trunk link between Network Termination #1 0 and the splitter 30; And the power loss situation after the stack of the reflected signal of all branch circuit link after the splitter; Wherein the transverse axis of waveform trace 0 has been represented the distance of network line distance detecting signal generating module 20, and the longitudinal axis is then represented the power loss of the reflected signal that the concrete point in the network line is produced, and certain power loss value here all is the relative value with respect to " P0 ".
In second step, detection signal generating module 20 is then sent first test signal that wavelength is λ 1, and said first test signal NE to each branch circuit link after reaching splitter 30 and demultiplexing is propagated.Because corresponding wavelength is the filter 1 of Γ 1 first test signal on its first branch circuit link 1 of living in is stopped; Receive the reflected signal of said first test signal thereby work as detection signal generating module 20, and write down first power value sequence of the reflected signal of said first test signal.Certainly; In embodiments of the present invention; Said detection signal generating module 20 also can be according to first power value sequence of the reflected signal of said first test signal and " P0 " that be provided with in advance; Obtain first waveform trace 1, said first waveform trace 1 is the trunk link, and the stack result of reflected signal that does not comprise other branch circuit link of first branch circuit link.Please with reference to Fig. 3, Fig. 3 is the sketch map according to the waveform trace 1 of the power loss drafting of the reflected signal of first test signal in the embodiment of the invention.
The 3rd step; Said waveform analysis module 40 is according to the said reference power value sequence and first power value sequence; Calculate the waveform trace of the power loss of first branch circuit link 1, thereby operating personnel can confirm the line conditions of first branch circuit link 1 according to first waveform trace of said first branch circuit link.Certainly, if detection signal generating module 20 has just been exported the reference waveform track and first waveform trace before, then here need be according to formula
Convert the reference waveform track and first waveform trace to reference power value sequence and first power value sequence.
Concrete; Waveform analysis module 40 is subtracted each other the reference power loss value sequence and the first power loss value sequence; Because being reference signal, reference power loss value sequence changes at the reflected signal of trunk link with all branch circuit link stacks; And first power sequence is the trunk link and the reflected signal of other all branch circuit link stacks of removing first branch circuit link changes into; Therefore the sequence of the reference power sequence and first power is subtracted each other, can obtain the power value sequence of first branch circuit link.Waveform analysis module then 40 calculates the power loss of each point on first branch circuit link again according to the power value sequence and the reference power value " P0 " of said first branch circuit link, and the drawing waveforms track.Please with reference to Fig. 4, shown in Figure 4 is the sketch map of waveform trace of drafting first branch circuit link of the embodiment of the invention.
Understandablely be; Only need to send the test signal of different wave length; And repeat second step and the 3rd and go on foot the waveform trace can obtain with the corresponding branch circuit link of wavelength of test signal, and operating personnel or computer system can be judged the line status of corresponding branch circuit link through said waveform trace.
The network situation detection system that the embodiment of the invention provided sends the test signal of different wave length through the detection signal generating module; Can obtain the power value sequence of corresponding filter branch circuit link of living in; And according to the fluctuation situation of the performance number of branch circuit link; Can realize the situation of network line is detected and fault location; Perhaps,, can determine the situation of branch circuit link more intuitively according to the fluctuation situation of waveform trace according to the power value sequence drawing waveforms track of said branch circuit link for point more directly perceived.Such as Fig. 4, occurred place fluctuation in the waveform trace according to the reflected signal that can see branch circuit link in the single channel trajectory diagram wherein, thereby can judge that there is the networking problem in this residing position of fluctuating.
Please with reference to Fig. 5, shown in Figure 5ly be the sketch map of the waveform analysis module 40 that the embodiment of the invention provided.Said waveform analysis module 40 comprises conversion module 42 and computing module 44.Said conversion module 42 is used for converting the waveform trace that detection signal generating module 20 generates into power value sequence, and power value sequence is scaled waveform trace.Reference power value sequence after the waveform trace that said computing module 44 is used to receive reference signal converts; And the measured power value sequence of the waveform trace of the reflected signal of test signal after converting, and calculate the branch circuit link power value sequence according to said reference power value sequence and measured power value sequence.
The waveform analysis of the said waveform analysis module 40 of the embodiment of the invention mainly comprises following several steps:
Step 501: computing module 44 calculates the first branch circuit link power value sequence according to the said reference power value sequence and first power value sequence;
Concrete; Computing module 44 subtracts each other the reference power value sequence and first power value sequence; Because the reference power value sequence is the reflected signal stack of reference signal in trunk link and all branch circuit link; And first power value sequence is being superimposed as of the folded reflected signal of trunk link and other all branch circuit link of removing first branch circuit link, therefore the reference power value sequence and first power value sequence is subtracted each other, and can obtain the power value sequence of the reflected signal of first branch circuit link.
Step 503: conversion module 42 is converted into the power value sequence of the reflected signal of said first branch circuit link waveform trace of first branch circuit link.
Understandable is that if detection signal generating module 20 has just been exported the reference waveform track and first waveform trace, the module that then converts 42 converts the said reference waveform track and first waveform trace to reference power value sequence and first power value sequence earlier.
Understandablely being, is that example describes though the present invention is a EPON with point-to-multipoint, and network situation detection system provided by the present invention also can be applied in other the network system of point-to-multipoint.
Please with reference to Fig. 6, shown in Figure 6 is the sketch map of the network condition detection method of the embodiment of the invention.Said network condition detection method is used for the network system of multiple branch circuit link; Said network system comprises a network terminal, a splitter and a plurality of NE; Said network condition detection method can be used for detecting the line conditions of many branch circuit link between splitter and the said a plurality of NE, and the network condition detection method that the embodiment of the invention provided comprises:
Step 601: produce with reference to test signal, and propagate into network line with reference to test signal with said;
Wherein, said network line comprises the basic routing line between the network terminal and the splitter, and the branch circuit link between splitter and a plurality of NE.
Step 602: receive said reflected signal, and write down the power of said reflected signal with reference to test signal, power value sequence as a reference with reference to test signal each point in said network line;
Step 603: produce and corresponding first test signal of first branch circuit link, and said first test signal is propagated to all branch circuit link;
Wherein, be provided with first filter in said first branch circuit link, the wavelength of said first test signal is corresponding with said first filter, that is to say, said first test signal can't be passed through said first filter.
Step 604: receive the each point reflected signal in said network line of said first test signal, and write down the performance number of the reflected signal of said first test signal, as first power value sequence;
Step 605:, obtain the power value sequence of the reflected signal of first branch circuit link according to the said reference power value sequence and first power value sequence;
Step 606: the network condition of judging said first branch circuit link according to the power value sequence of the reflected signal of said first branch circuit link.
Certainly, directly perceived for the ease of being convenient to judgement, the network condition detection method that the embodiment of the invention provided, said step 606 can also comprise:
Step 606a: the power value sequence of the reflected signal of said first branch circuit link is converted into waveform trace, with foundation as the network condition of judging said first branch circuit link.Wherein, In embodiments of the present invention; The waveform trace of the power loss that said waveform trace can calculate for the performance number according to said reflected signal in other alternate embodiments, also can directly come the drawing waveforms track according to said power value sequence.
The network condition detection method that the embodiment of the invention provided, the method through filter shielding test signal is used for the foundation of identification circuit situation from reference to the reflected signal of test signal the power loss of branch circuit link to be tested being calculated.
Further, because the business of PON is a broadcast type, promptly the business that issues of each port of splitter is the same basically.So though NE has the ID of oneself, generally, the network terminal can't know that NE is which output port that is linked into splitter.The user at will arrives different branch roads in the mobile network unit like this, and the network terminal also can't be found.And adopt the network situation detection system that the embodiment of the invention provided also to can be used for realizing that the output port of NE and splitter matees automatically.Please with reference to Fig. 7, the automatic matching method of the NE that the embodiment of the invention provided and the output port of splitter comprises:
Step 701: send test massage to a plurality of NEs through splitter, the filter wavelength of the pairing filter of output port of the wavelength of said test signal and splitter to be matched is corresponding;
Step 702: the feedback signal that receives said a plurality of NEs;
Step 703: the feedback signal according to said a plurality of NEs judges, with the corresponding NE of output port of said splitter to be matched.
The automatic matching method of the embodiment of the invention is through detecting the coupling that feedback signal realizes the output port of NE and splitter, and is simple to operate and the result is accurate.
Please with reference to Fig. 8, shown in Figure 8 is the automatic matching method that further embodiment of this invention provided.The described automatic matching method of the embodiment of the invention comprises:
Step 801: the network terminal sends the instruction of preparing to accept checking through splitter to a plurality of NEs;
Step 802 sends test massage to a plurality of NEs through splitter, and wherein, the filter wavelength of the pairing filter of output port of the wavelength of said test signal and splitter to be matched is corresponding;
Step 803: the network terminal receives the feedback signal of NE, and confirms and the corresponding NE of output port of said splitter to be matched wherein, said feedback signal is used to explain whether said a plurality of NE receives test signal.
The automatic matching method of the embodiment of the invention is through detecting the coupling that feedback signal realizes the output port of NE and splitter, and is simple to operate and the result is accurate.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (14)
1. network situation detection system is used for the network system of point-to-multipoint, and said network system comprises splitter; And, comprising first NE in said a plurality of NEs through a plurality of NEs that many branch circuit link and said splitter are communicated by letter and be connected, said first NE is communicated by letter with said splitter through first branch circuit link and is connected; It is characterized in that; Said network situation detection system comprises detection signal generating module, waveform analysis module and filter, wherein
Said detection signal generating module is used to produce detection signal; Broadcast said detection signal through said splitter to said a plurality of NEs; Receive the reflected signal that said detection signal produces in network line; And detecting the power value sequence of the reflected signal of said detection signal, said detection signal comprises with reference to the test signal and first test signal;
Said filter is arranged on said first branch circuit link, and the filter wavelength of said filter equals the first test wavelength, is used to stop said first test signal to propagate in said first branch circuit link;
Said waveform analysis module; Be used for first power value sequence according to the reflected signal of the reference power value sequence of said reflected signal with reference to test signal and said first test signal; Obtain the power value sequence of the reflected signal of said first branch circuit link, with the foundation that detects as the network condition of said first branch circuit link.
2. network situation detection system as claimed in claim 1 is characterized in that, said detection signal generating module also comprises coupler, is used for being coupled to network line with said with reference to test signal and said first test signal.
3. network situation detection system as claimed in claim 1; It is characterized in that; Said waveform analysis module comprises: computing module, be used for said reference power value sequence and said first power value sequence are subtracted each other, and obtain the power value sequence of the reflected signal of said first branch circuit link.
4. network situation detection system as claimed in claim 1 is characterized in that, said waveform analysis module also comprises computing module, is used for generating waveform trace according to power value sequence.
5. network situation detection system as claimed in claim 4; It is characterized in that; Said computing module generates the waveform trace of the reflected signal of first branch circuit link according to the power value sequence of the reflected signal of said first branch circuit link, and the waveform trace of the reflected signal of said first branch circuit link is used to describe the power loss of the reflected signal of said first branch circuit link.
6. network condition detection method; The network system that is used for the multiple branch circuit link; Said network system comprises a network terminal, a splitter and a plurality of NEs of communicating by letter and being connected through many branch circuit link and said splitter; Said a plurality of NE comprises first NE of communicating by letter and being connected through first branch circuit link and said splitter, and said network system also comprises filter, and said filter is arranged on said first branch circuit link; It is characterized in that said network condition detection method comprises:
Generation is broadcasted to said a plurality of NEs with reference to test signal said with reference to test signal;
Receive said reflected signal, and write down the reference power value sequence of said reflected signal with reference to test signal with reference to test signal;
Produce first test signal; And through said splitter with said first test signal to said a plurality of NEs broadcasting; Said first test signal can't be through being arranged on the filter of said first branch circuit link; Wherein, the filter wavelength of said filter equals the first test wavelength, is used to stop the signal of respective wavelength on said first branch circuit link, to propagate;
Receive the reflected signal of said first test signal, and write down first power value sequence of the reflected signal of said first test signal;
Obtain the power value sequence of the reflected signal of said first branch circuit link according to said reference power value sequence and said first power value sequence;
Judge the network condition of said first branch circuit link according to the power value sequence of the reflected signal of said first branch circuit link.
7. network condition detection method as claimed in claim 6 is characterized in that, said step judges that according to the power value sequence of the reflected signal of said first branch circuit link network condition of said first branch circuit link also comprises:
The power value sequence of the reflected signal of said first branch circuit link is converted into waveform trace, judges the network condition of said first branch circuit link according to said waveform trace.
8. network condition detection method as claimed in claim 6 is characterized in that, said step judges that according to the power value sequence of the reflected signal of said first branch circuit link network condition of said first branch circuit link also comprises:
The power value sequence of the reflected signal of said first branch circuit link is converted into the waveform trace of the power loss of the reflected signal that has reflected first branch circuit link.
9. network condition detection method as claimed in claim 6 is characterized in that, the said power value sequence that obtains the reflected signal of said first branch circuit link according to said reference power value sequence and said first power value sequence comprises:
Said reference power value sequence and said first power value sequence are subtracted each other, with the power value sequence of the reflected signal that obtains said first branch circuit link.
10. a network system comprises the network terminal, the splitter of communicating by letter and being connected with the said network terminal; And a plurality of NEs of communicating by letter and being connected through many branch circuit link and said splitter; Comprise first NE in said a plurality of NE, said first NE is communicated by letter with said splitter through first branch circuit link and is connected, and it is characterized in that; Said network system also comprises network situation detection system; Said network situation detection system comprises detection signal generating module, waveform analysis module and filter, wherein
Said detection signal generating module is used to produce detection signal; Broadcast said detection signal through said splitter to said a plurality of NEs; Receive the reflected signal that said detection signal produces in network line; And detecting the power value sequence of the reflected signal of said detection signal, said detection signal comprises with reference to the test signal and first test signal;
Said filter is arranged on said first branch circuit link, and the filter wavelength of said filter equals the first test wavelength, is used to stop said first test signal to propagate in said first branch circuit link;
Said waveform analysis module; Be used for first power value sequence according to the reflected signal of the reference power value sequence of said reflected signal with reference to test signal and said first test signal; Obtain the power value sequence of the reflected signal of said first branch circuit link, with the foundation that detects as the network condition of said first branch circuit link.
11. network system as claimed in claim 10 is characterized in that, said detection signal generating module also comprises coupler, is used for being coupled to network line with said with reference to test signal and said first test signal.
12. network system as claimed in claim 10; It is characterized in that; Said waveform analysis module comprises: computing module, be used for said reference power value sequence and said first power value sequence are subtracted each other, and obtain the power value sequence of the reflected signal of said first branch circuit link.
13. network system as claimed in claim 10 is characterized in that, said waveform analysis module also comprises computing module, is used for generating waveform trace according to power value sequence.
14. network system as claimed in claim 13; It is characterized in that; Said computing module generates the waveform trace of the reflected signal of first branch circuit link according to the power value sequence of the reflected signal of said first branch circuit link, and the waveform trace of the reflected signal of said first branch circuit link is used to describe the power loss of the reflected signal of said first branch circuit link.
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| CN102118658B (en) * | 2009-12-31 | 2014-02-19 | 华为技术有限公司 | Method and device for port identification of light splitter |
| CN103297126B (en) * | 2013-06-07 | 2016-06-22 | 广西师范大学 | The PON line fault monitoring method of optically-based labelling method and device thereof |
| CN103560827B (en) * | 2013-10-18 | 2016-08-24 | 华为技术有限公司 | Fault detection method and device |
| CN105743568B (en) * | 2014-12-08 | 2020-06-19 | 上海诺基亚贝尔股份有限公司 | Optical fiber link detection method and device in PON system |
| CN109921847B (en) * | 2019-04-15 | 2020-09-22 | 中国电力科学研究院有限公司 | Method and system for positioning fault branch in passive optical network |
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| CN2518262Y (en) * | 2002-01-18 | 2002-10-23 | 北京北邮电信科技股份有限公司 | Automatic monitor for optical cable |
| CN101217313A (en) * | 2008-01-11 | 2008-07-09 | 北京邮电大学 | A fault diagnosis method applied OTDR passive optical network optical fiber |
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