CN102098097A - Optical network unit fault detection method and system in PON and optical line terminal - Google Patents
Optical network unit fault detection method and system in PON and optical line terminal Download PDFInfo
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- CN102098097A CN102098097A CN2009101889182A CN200910188918A CN102098097A CN 102098097 A CN102098097 A CN 102098097A CN 2009101889182 A CN2009101889182 A CN 2009101889182A CN 200910188918 A CN200910188918 A CN 200910188918A CN 102098097 A CN102098097 A CN 102098097A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
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Abstract
The invention discloses an optical network unit fault detection method and an optical network unit fault detection system in a passive optical network (PON), and an optical line terminal, which are used for realizing the fault detection of at least one optical network unit by using the optical line terminal. The method comprises the following steps of: a comparison step, namely comparing the times when an optical detection signal is triggered by the light of the optical network unit after the optical detection signal is reset in a current state or a normal state; and a judgment step, namely judging whether a long-light fault is in the optical network unit of the PON according to a comparison result. The method can accurately judge the long-light fault of the optical network unit in the PON, and ensures the reliability of the system and the stability of data transmission.
Description
Technical field
The present invention relates to the passive light technical field, relate in particular to a kind of PON (Passive OpticalNetwork: the optical network unit passive optical-fiber network) (ONU:Optical Network Unit) fault detection method, system and a kind of optical line terminal (OLT:Optical Line Terminal).
Background technology
PON refers in the Optical Distribution Network (ODN:Optical DistributionNetwork) between OLT and ONU without any active electronic equipment, mainly adopts devices such as optical splitter, Wavelength division multiplexer/demultiplexer to connect and exchanges.PON can be according to concrete needs, form topological structures such as tree type, star-like and bus-type neatly, do not need valuable active device at optical branch point, and under the general state, an OLT light mouth can carry 32 to 128 ONU.Therefore, PON has the cable resource of saving, machine room investment, device security height, the fast and comprehensive networking low cost and other advantages of networking speed are shared, saved to bandwidth resources.
In the actual networking and Test Application of PON, carry under the state of a plurality of ONU at an OLT light mouthpiece, OLT adopts the broadcast mode transmission signals to the down direction of ONU, and ONU adopts the mode transmission signals of timesharing communication to the up direction of OLT.When arbitrary ONU when non-OLT distributes to its timeslice, the luminous closed condition that is in of optical module among this ONU is carried out the signal transmission this moment between other ONU and the OLT.If a certain ONU light mouth fails in time to close because of reasons such as equipment faults, light signal continues to stay open state at up sending direction, will take optical fiber, thereby causes OLT can't receive the signal of other ONU uplink, and this fault is called long hair light fault; When state was serious, OLT may think that going offline has appearred in other ONU or other situations, and the signal transmission and the communication quality of whole PON system made a big impact.
Summary of the invention
Technical problem to be solved by this invention is, a kind of simple, optical network unit fault detection method, system and a kind of optical line terminal among the PON accurately and reliably is provided.
The technical solution adopted for the present invention to solve the technical problems is: the fault detection method of the optical network unit among a kind of PON is provided, is used to realize the fault detect of optical line terminal at least one optical network unit, may further comprise the steps:
Comparison step: after resetting under the current state and under the normal condition, luminous by optical network unit and the time that trigger compares to light detecting signal;
Determining step: judge according to comparative result whether optical network unit exists long hair light fault among the current PON.
Determining step is specially: luminous by optical network unit and difference time of triggering is in certain scope if after described light detecting signal resets under current state and under the normal condition, there is long hair light fault in optical network unit among the then current PON.
Comparison step is specially: after adopting reset signal that the light detecting signal under the current state is resetted, adopt clock signal luminous to described light detecting signal and the time that trigger is carried out sample count, and the count value that obtains under the count value that obtains and the normal condition is compared by optical network unit.
The mode of sample count comprises rising edge sampling, trailing edge sampling or two along sampling.
Preferably, described clock signal and described reset signal homophase.
The start time of sample count is resetting constantly or the finish time that resets of described light detecting signal.
If the pulsewidth of described reset signal is the frequency of 2 bytes, described clock signal is that the start time of 155.52MHz and sample count is the finish time that resets of described light detecting signal, and then determining step is specially:
If the count value that obtains under the current state is 1, show that described light detecting signal resets under current state and under the normal condition after, luminous by optical network unit and difference time of triggering is not less than 2 bytes, there is long hair light fault in optical network unit among the then current PON;
If the count value that obtains under the current state is 3, show that described light detecting signal resets under current state and under the normal condition after, the difference of and time of triggering luminous by optical network unit is less than 1 byte, and there is not long hair light fault in optical network unit among the then current PON.
Further, the step that also comprises default sampling time zone before the comparison step;
Comparison step also is included in the described sampling time zone carries out repeatedly sample count to the light detecting signal under the current state, and the step that the count value that obtains under a plurality of count values that obtain and the normal condition is compared.
The present invention also provides the fault detection system of the optical network unit among a kind of PON, comprises at least one optical network unit and the optical line terminal that is used for optical network unit is carried out fault detect, and optical line terminal comprises comparison control module and fault judgement module;
Relatively control module is used for light detecting signal after resetting under the current state and under the normal condition, and is luminous by optical network unit and the time that trigger compares;
The fault judgement module is used for judging according to the comparative result that described relatively control module obtains whether current PON optical network unit exists long hair light fault.
Further, the optical link unit also comprises PON optical module, reseting module and clock generation module;
The PON optical module is used to export light detecting signal to described relatively control module;
Thereby reseting module is used to export reset signal to described PON optical module to be resetted to described light detecting signal;
Clock generation module is used for clock signal to described relatively control module;
Relatively control module is used for utilizing under current state described clock signal luminous by optical network unit to described light detecting signal and the time that trigger is carried out sample count, and the count value that obtains under the count value that obtains and the normal condition is compared.
The invention has the beneficial effects as follows, the present invention can utilize light detecting signal that the long hair light fault of ONU among the PON is detected judgement exactly, the light mouth of having avoided some ONU is owing to reasons such as equipment fault fail in time to close, cause OLT can't receive the problem of the uplink optical signal of other ONU, therefore, the reliability and the stability of data transmission of PON system have been guaranteed.
Further, the present invention is directed under the normal condition and malfunction under the less situation of light detecting signal difference, situation that trigger accurately detects and logic determines the method for utilizing sample count to light detecting signal under the current state and under the normal condition is luminous by ONU, has significantly improved the accuracy that detects and the accuracy of judgement.
Description of drawings
Fig. 1 is the optical network unit fault detection method flow chart based on PON of a kind of embodiment of the present invention;
Fig. 2 is the comparison sequential chart of the light detecting signal of a kind of embodiment of the present invention;
Fig. 3 be under the long hair light malfunction with normal condition under the comparison schematic diagram of light detecting signal;
Fig. 4 is the optical network unit fault detection system block diagram based on PON of a kind of embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Fig. 1 provides the ONU fault detection method among the PON of one embodiment of the present invention, is used to realize the fault detect of OLT at least one ONU.Specifically may further comprise the steps:
Step S100: after resetting under the current state and under the normal condition, luminous by ONU and the time that trigger compares to light detecting signal.
In the PON system, the PON optical module of OLT side can receive the uplink optical signal from least one ONU, and whether the light detecting signal under the output current state (BRST_Det signal) detects has ONU to send uplink optical signal to OLT, the BRST_Det signal is equivalent to light burst detection signal in itself, and the PON MAC of OLT side (PON controller) provides reset signal (RST signal) to be used for the BRST_Det signal is resetted.Comparison sequential chart as shown in Figure 2, in the normal newsletter, ONU#1 plays the RST signal and put 1 the luminous finish time, triggers BRST_Det1 signal under the normal condition and the BRST_Det2 signal under the long hair light malfunction this moment and is changed to low level 0 constantly resetting; After the RST signal returned 0, the BRST_Det1 signal resetted and finishes but keep putting 0, and after this, PON is arranged in the luminous ONU# 2 of this time slot under normal condition luminous and trigger the BRST_Det1 signal and get back to high level 1; And the BRST_Det2 signal almost puts 1 immediately after the RST signal returns 0.
Particularly, the RST signal was put 1 o'clock, and whether no matter light signal arranged, and BRST_Det1 signal and BRST_Det2 signal all put 0; After the RST signal returns 0, whether BRST_Det1 signal and BRST_Det2 signal can detect has ONU to send uplink optical signal to OLT, and when finding that uplink optical signal is arranged, put 1, if after this light signal finishes, BRST_Det1 signal or BRST_Det2 signal can't return 0.
Under the normal condition, the minimum interval between the luminous initial moment of the luminous finish time of ONU# 1 and ONU# 2 is 4bytes (byte), and after promptly RST signal rising edge played 4bytes, the luminous triggering of ONU# 2 BRST_Det1 signal put 1; And when long hair light fault appears in a certain ONU among the PON,, the trailing edge of RST signal is almost overlapped with the rising edge of BRST_Det2 signal because the RST signal returns 0 back BRST_Det2 and puts 1 immediately.
Be illustrated in figure 3 as the BRST_Det2 signal under the long hair light malfunction after the amplification and the comparison schematic diagram of the BRST_Det1 signal under the normal condition, between the trailing edge of the rising edge of RST signal and BRST_Det1 signal or BRST_Det2 signal, all keep certain time of delay between the rising edge of the trailing edge of RST signal and BRST_Det2 signal, be generally the output delay time of PON optical module inside chip this time of delay, it is former because the light detecting signal of PON optical module output is generally the 3.3VTTL level, the rising of output signal, trailing edge is precipitous inadequately, when the reference clock that the light mouth sends was 155.52MHz, this time of delay was generally in 3ns (this moment, 1byte approximated 6.42ns).
It is that 0 time and BRST_Det1 signal are to compare time of 0 that this step is actually the BRST_Det signal.The BRST_Det signal is 0 time, be after the BRST_Det signal resets, and the time that trigger luminous by ONU can be by measuring, the BRST_Det1 signal is 0 time, be after the BRST_Det1 signal resets, and time of triggering luminous by ONU can draw according to calculation of parameter such as the luminous time slot of PON system, time of delays.Certainly, also can take indirect measurement and manner of comparison.In fact, it is general also very little that the RST signal returns moment of 0 and the ONU# 2 time interval between the luminous initial moment, when the pulsewidth of RST signal is 2bytes, time interval minimum between the rising edge of BRST_Det2 signal and BRST_Det1 signal is 2bytes, show to be used to measure whether exist the time range of long hair light fault very little, need accurate method of measurement just can draw judged result accurately by ONU.
After BRST_Det signal and BRST_Det1 signal are resetted, luminous by ONU and the time that trigger accurately compares, a kind of method of measurement of present embodiment is: utilize clock signal to carry out sample count, after promptly the BRST_Det signal being resetted, adopt clock signal luminous to the BRST_Det signal and the time that trigger is carried out sample count, and compare under the count value that obtains and the normal condition BRST_Det1 being carried out the same count value that measures by ONU.For the ease of enforcement, the start time of sample count can be resetting constantly or the finish time that resets of BRST_Det signal, and promptly the rising edge of RST signal or trailing edge begin sample count, in the rising edge end sample count of BRST_Det signal.
As much as possible, should reduce the pulsewidth of RST signal, reserving enough detection times, and for example adopt that the above high frequency clock signal of 100MHz carries out sample count to the BRST_Det signal, the mode of sample count is general rising edge sampling or trailing edge sampling; If adopt the following low-frequency clock of 100MHZ for example, then the mode of sample count also can be the lower edge and samples simultaneously, and afterwards a kind of mode is had relatively high expectations to the duty ratio of clock signal, and the variation of clock duty cycle can bring certain influence to measuring stability.Preferably, the frequency of the clock signal of sample count is identical with the frequency of the reference clock that the light mouth sends, or the integral multiple of the frequency of the reference clock that sends of light mouth, make under the situation of clock signal and RST signal homophase and can access the most accurate comparative result and judged result.
Step S101: judge according to comparative result whether ONU exists long hair light fault among the current PON.In this step, after the BRST_Det1 signal under the normal condition can being resetted, and time of triggering luminous by ONU is judged the comparative result of step S100, to determine whether comparative result shows that there is failure light emission in ONU among the current PON as benchmark.
After if comparative result shows that BRST_Det signal and BRST_Det1 signal reset, luminous by ONU and difference time of triggering is in certain scope, for example be not less than certain numerical value, it is luminous and put 1 to illustrate that the BRST_Det signal is arranged in the luminous ONU of normal time slot no thanks to, but after the RST signal returns 0, directly putting 1, ONU certainly exists long hair light fault among the then current PON.
This scope can be a zone or an occurrence, can draw according to the luminous time slot of PON system and the calculation of parameter such as pulsewidth of RST signal in theory, should equal the blanking time between the rising edge of the trailing edge of RST signal and BRST_Det1 signal, be about 2bytes in the present embodiment, promptly reset and to also have 2bytes or about 13ns just can have ONU luminous after finishing, but also should consider the output delay time time of delay of above said PON optical module inside chip in the practical application, so actual range is much smaller than this numerical value.
On the contrary, after if comparative result shows that BRST_Det signal and BRST_Det1 signal reset, luminous by ONU and difference time of triggering is in another scope, for example less than certain numerical value, desirable 1bytes in the present embodiment, there is long hair light fault scarcely in ONU among the then current PON.After if BRST_Det signal and BRST_Det1 signal reset, the difference of and time of triggering luminous by ONU is between above-described two scopes, and then may there be long hair light fault in the ONU among the PON.
In for example a kind of execution mode, when if the reference clock that the light mouth sends is 155.52MHz, adopting pulsewidth is that the RST signal of 2 bytes is to the BRST_Det signal with the BRST_Det1 signal resets and the start time of sample count is under the situation about resetting the finish time, after BRST_Det signal and BRST_Det1 signal reset, luminous by ONU and difference maximum time of triggering is about 13ns.Carry out sample count if use the clock signal of 100MHz, sampling period is 10ns, because the phase place of BRST_Det signal and RST signal is unfixing, during each the sampling, sampled point can drift about with respect to the BRST_Det signal, the count value that sample count obtains can fluctuate, if sampled point is bad even can't pick out long hair light fault sometimes, for example when sampled point appears at the RST signal and returns after 0 3-4ns, the BRST_Det signal is because the signal edge is slow, also be not lifted to the level of logical one fully, and at next sampled point, just behind the 10ns, the BRST_Det signal also may be judged as the logical one level, can not find the long hair light fault of ONU exactly.
Yet, if adopting preferred and RST signal homophase, frequency is that the clock signal of 155.52MHz is carried out sample count to the BRST_Det signal, sampling period is about 6.42ns, cause and RST signal homophase, the count value relative fixed that counts to get with the normal condition down-sampling under the malfunction, can easier obtain distinguishing, concrete determination methods is:
If the count value that obtains is 1, and the BRST_Det1 signal under the normal condition is carried out the count value that same sample count obtains is 3, by comparison shows that the difference between the two is 2, after then BRST_Det signal and BRST_Det1 signal reset, luminous by ONU and difference time of triggering is not less than 2bytes, necessarily there is long hair light fault in ONU among the then current PON;
If the count value that obtains is 3, and the BRST_Det1 signal under the normal condition is carried out the count value that same sample count obtains is 3, by comparison shows that the difference between the two is 0, after then BRST_Det signal and BRST_Det1 signal reset, the difference of and time of triggering luminous by ONU is less than 1bytes, and there is long hair light fault scarcely in ONU among the then current PON;
If the count value that obtains is 2, if and the BRST_Det1 signal under the normal condition is carried out the count value that same sample count obtains is 3, by comparison shows that the difference between the two is 1, after then BRST_Det signal and BRST_Det1 signal reset, the difference of and time of triggering luminous by ONU is between 1bytes and 2bytes, and not necessarily there is long hair light fault in ONU among the then current PON.
Further, also can be relatively according to the default sampling time zone of concrete needs, for example get 200ms, in this default sampling time zone, repeatedly sample, and the count value that obtains under a plurality of count values that obtain under the current state and the normal condition compared, multiple RST signal also can be set simultaneously.
For example in default sampling time zone, if the occurrence count value is 1 situation in a plurality of count values that obtain, and not have count value be 3, then should certainly exist the long hair light fault of ONU in the time period among the PON.
If the occurrence count value is 3 situation in a plurality of count values that obtain, and not have count value be 1, then should be in the time period the inevitable long hair light fault that did not have ONU among the PON.
If count value is 1 and is that 3 situation exists simultaneously in a plurality of count values that obtain, and count value is that 3 number of times is obviously on the low side, then have the long hair light fault of ONU, and this ONU is working properly in this time slot.In fact, in one section continuous time zone, simultaneously the occurrence count value be 1 and be 3 situation and count value be 1 number of times obviously situation on the low side seldom occur, there is the long hair light fault of ONU in this situation explanation, and the malfunction instability of this ONU is bad during fashion.
Further, after the method for utilizing present embodiment to provide detects the ONU fault among the PON, if find to certainly exist the long hair light fault of ONU, the failure light emission that perhaps may have ONU, also can the ONU that have long hair light fault be positioned and further detect thereby close ONU sidelight mouth one by one in conjunction with the software determination methods.
As shown in Figure 4, ONU fault detection system among the PON of present embodiment comprises at least one ONU (optical network unit 20) and is used for ONU is carried out the OLT (optical line terminal 10) of fault detect, OLT realizes being connected by ODN (Optical Distribution Network 30) and a plurality of ONU and is mutual, also comprises comparison control module 11, fault judgement module 12, PON optical module 13, PON MAC (reseting module 14) and CLK (clock generation module 15) among the OLT.
PON optical module 13 is used for from the uplink optical signal of ODN reception from ONU, and the BRST_Det signal is provided and exports it to comparison control module 11.
CLK provides the clock signal that is used to carry out sample count, and exports this clock signal to comparison control module 11.In order to realize accurately sample count and fault judgement, should select high frequency clock for use, make the RST signal homophase of clock signal and PON MAC output as far as possible, the frequency of for example getting clock signal is 155.52MHz.
After relatively control module 11 is used for the BRST_Det signal under the current state and the BRST_Det1 signal under the normal condition resetted, luminous by ONU and the time that trigger compares, and comparative result is offered fault judgement module 12.Particularly, relatively control module 11 be used to utilize clock signal to the BRST_Det signal after resetting, luminous by ONU and the time that trigger is carried out sample count, and compare under the count value that obtains and the normal condition BRST_Det1 signal being carried out the count value that same sample count obtains.
Particularly, relatively control module 11 and fault judgement module 12 can all be located at a PLD (programmable logic device: programmable logic device) or EPLD (ErasableProgrammable Logic Device: but can wipe the editorial logic device) thus in realize its function.
The present invention can utilize light detecting signal that the long hair light fault of ONU among the PON is detected judgement exactly, simple, good reliability, the light mouth of having avoided some ONU is owing to reasons such as equipment fault fail in time to close, cause OLT can't receive the problem of the uplink optical signal of other ONU, therefore, the reliability and the stability of data transmission of system have been guaranteed.Further, the present invention is directed under the normal condition and malfunction under the less situation of light detecting signal difference, situation that trigger accurately detects and logic determines the method for utilizing sample count to light detecting signal under the current state and under the normal condition is luminous by ONU, has significantly improved the accuracy that detects and the accuracy of judgement.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. the optical network unit fault detection method among the PON is used to realize the fault detect of optical line terminal at least one optical network unit, it is characterized in that, may further comprise the steps:
Comparison step: after resetting under the current state and under the normal condition, luminous by optical network unit and the time that trigger compares to light detecting signal;
Determining step: judge according to comparative result whether optical network unit exists long hair light fault among the current PON.
2. method according to claim 1 is characterized in that determining step is specially:
After if described light detecting signal resets under current state and under the normal condition, luminous by optical network unit and difference time of triggering is in certain scope, there is long hair light fault in optical network unit among the then current PON.
3. method according to claim 2 is characterized in that comparison step is specially:
After adopting reset signal that the light detecting signal under the current state is resetted, adopt clock signal luminous to described light detecting signal and the time that trigger is carried out sample count, and the count value that obtains under the count value that obtains and the normal condition is compared by optical network unit.
4. method according to claim 3 is characterized in that, the mode of sample count comprises rising edge sampling, trailing edge sampling or two along sampling.
5. according to claim 3 or 4 described methods, it is characterized in that described clock signal and described reset signal homophase.
6. according to claim 3 or 4 described methods, it is characterized in that the start time of sample count is resetting constantly or the finish time that resets of described light detecting signal.
7. method according to claim 6, it is characterized in that, if the pulsewidth of described reset signal is the frequency of 2 bytes, described clock signal is that the start time of 155.52MHz and sample count is the finish time that resets of described light detecting signal, and then determining step is specially:
If the count value that obtains under the current state is 1, show that described light detecting signal resets under current state and under the normal condition after, luminous by optical network unit and difference time of triggering is not less than 2 bytes, there is long hair light fault in optical network unit among the then current PON;
If the count value that obtains under the current state is 3, show that described light detecting signal resets under current state and under the normal condition after, the difference of and time of triggering luminous by optical network unit is less than 1 byte, and there is not long hair light fault in optical network unit among the then current PON.
8. according to claim 3 or 4 described methods, it is characterized in that, also comprise the step in default sampling time zone before the comparison step;
Comparison step also is included in the described sampling time zone carries out repeatedly sample count to the light detecting signal under the current state, and the step that the count value that obtains under a plurality of count values that obtain and the normal condition is compared.
9. the optical network unit fault detection system among the PON comprises at least one optical network unit and is used for optical network unit is carried out the optical line terminal of fault detect, it is characterized in that optical line terminal comprises comparison control module and fault judgement module;
Relatively control module is used for light detecting signal after resetting under the current state and under the normal condition, and is luminous by optical network unit and the time that trigger compares;
The fault judgement module is used for judging according to the comparative result that described relatively control module obtains whether current PON optical network unit exists long hair light fault.
10. system according to claim 9 is characterized in that, the optical link unit also comprises PON optical module, reseting module and clock generation module;
The PON optical module is used to export light detecting signal to described relatively control module;
Thereby reseting module is used to export reset signal to described PON optical module to be resetted to described light detecting signal;
Clock generation module is used for clock signal to described relatively control module;
Relatively control module is used for utilizing under current state described clock signal luminous by optical network unit to described light detecting signal and the time that trigger is carried out sample count, and the count value that obtains under the count value that obtains and the normal condition is compared.
11. an optical line terminal is used at least one optical network unit of PON is carried out fault detect, it is characterized in that, comprises comparison control module and fault judgement module;
Relatively control module is used for light detecting signal after resetting under the current state and under the normal condition, and is luminous by optical network unit and the time that trigger compares;
The fault judgement module is used for judging according to the comparative result that described relatively control module obtains whether current PON optical network unit exists long hair light fault.
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| CN2009101889182A CN102098097A (en) | 2009-12-14 | 2009-12-14 | Optical network unit fault detection method and system in PON and optical line terminal |
| PCT/CN2010/078799 WO2011072563A1 (en) | 2009-12-14 | 2010-11-16 | Method, system and optical line terminal for detecting fault of optical network unit in passive optical network (pon) |
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| CN2009101889182A CN102098097A (en) | 2009-12-14 | 2009-12-14 | Optical network unit fault detection method and system in PON and optical line terminal |
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| CN101262282B (en) * | 2007-03-06 | 2012-06-06 | 中兴通讯股份有限公司 | A method and device for improving reliability of passive optical network |
-
2009
- 2009-12-14 CN CN2009101889182A patent/CN102098097A/en active Pending
-
2010
- 2010-11-16 WO PCT/CN2010/078799 patent/WO2011072563A1/en active Application Filing
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| CN102843181A (en) * | 2011-06-20 | 2012-12-26 | 中兴通讯股份有限公司 | Device and method for long light-emitting protection of passive optical network |
| CN102832996A (en) * | 2012-09-04 | 2012-12-19 | 深圳市共进电子股份有限公司 | Constant emitting detecting and overcoming method and device of optical module in EPON (Ethernet Passive Optical Network) |
| CN103618972A (en) * | 2013-11-07 | 2014-03-05 | 南京杰德科技有限公司 | Data sending and parsing method and parsing device achieving parsing method |
| CN103618972B (en) * | 2013-11-07 | 2016-05-18 | 南京杰德科技有限公司 | Sending method, the analytic method of data and realize the resolver of analytic method |
| CN103728150A (en) * | 2014-01-17 | 2014-04-16 | 徐州徐工施维英机械有限公司 | Breakdown detection system and method for concrete mixing plant |
| CN109547100A (en) * | 2018-12-05 | 2019-03-29 | 广州芯德通信科技股份有限公司 | A kind of optical power enhancement device and method forcibly closing abnormal fibre-optic terminus |
| CN112383845A (en) * | 2020-11-09 | 2021-02-19 | 国网四川省电力公司成都供电公司 | Test circuit and method convenient for PON to access network link |
| CN112865861A (en) * | 2020-12-31 | 2021-05-28 | 深圳市吉光通科技有限公司 | Optical network fault processing device, optical module and method |
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| WO2011072563A1 (en) | 2011-06-23 |
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