CN102340349B - Multi-port automatic fault detection system for single-fiber three-way multiplexer - Google Patents
Multi-port automatic fault detection system for single-fiber three-way multiplexer Download PDFInfo
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Abstract
The invention relates to a multi-port automatic fault detection system for a single-fiber three-way multiplexer, which comprises a weak light detection circuit, a signal conditioning part and a single-chip microcomputer control part, wherein the weak light detection circuit is used for extracting light signals accessed to four ports in a set proportion under the cooperation of a light beam splitter and converting the extracted weak light signals into weak current signals; the signal conditioning part is used for converting the weak current signals produced by the weak light detection circuit into weak voltage signals and comparing the weak voltage signals after voltage amplification with a preset light signal detection threshold to obtain corresponding digital logics; and the single-chip microcomputer control part is used for obtaining the operating states of the four ports through the digital logics produced by the signal conditioning part. The multi-port automatic fault detection system for the single-fiber three-way multiplexer has the advantages that the light signal threshold can be dynamically adjusted and detected and the reliability is good.
Description
Technical field
The invention belongs to Optical Access Network network technical field, in particular for the multiport automatic monitoring system of the single-fiber three-way multiplexer in Fiber to the home (FTTH) or Fiber To The Building (FTTB) access network.
Background technology
Along with advancing the paces of " unification of three nets ", the Chinese government constantly accelerates the most competitive access network technology of (FTTH) technology that Fiber to the home or Fiber To The Building (FTTB) technology become gradually realization " unification of three nets " target.
Single-fiber three-way multiplexer (Triplexer) is one of core devices in FTTH technology actual application, and its major function has been coupling and the wavelength division multiplexing to light signal.EPON and GPON technical standard ITU-TG.983 and G.984 specification single-fiber three-way multiplexer adopt the three-wavelength allocative decision of 1310nm, 1490nm and 1550nm, that is: 1310nm wavelength is for terminal use's uplink; 1490nm wavelength is for descending data traffic transmission; 1550nm wavelength is for descending CATV business transmission.This transmission plan has adopted the transmission means of point-to-multipoint, has effectively reduced the utilization rate of local side apparatus and optical fiber, has improved the reliability of system.
But, because single-fiber three-way multiplexer uses at user side, and user side often has applied environment complexity, the unfavorable factors such as burst accident occurrence frequency height, the single-fiber three-way multiplexer of adding the discrete extensively adopting at present has the feature of multiple fiber ports (being generally 4 fiber ports), so, once user side generation network insertion fault, so for the malfunction elimination of single-fiber three-way multiplexer by thering is higher difficulty, may expend huge human and material resources.Therefore be, very necessary for the design and development work of the multiport automatic fault detection system of single-fiber three-way multiplexer.
At present, in all kinds of documents, the system with fault detection capability or the device for single-fiber three-way multiplexer design found only have " single-fiber three-way multiplexer is monitored and fault location system automatically " (application number: 201010226078.7), but this system does not possess the function that light signal fault detect thresholding regulates automatically, and there is no to propose the Fault Locating Method for this class multi-port optical device of single-fiber three-way multiplexer or equipment.
Summary of the invention
Lack dynamic adjustments sensed light signal thresholding, the poor deficiency of reliability in order to overcome the existing multiport automatic fault detection system for single-fiber three-way multiplexer, the invention provides a kind of can dynamic adjustments sensed light signal thresholding, the good multiport automatic fault detection system for single-fiber three-way multiplexer of reliability.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of multiport automatic fault detection system for single-fiber three-way multiplexer, comprise: Dim light measurement circuit, for under the cooperation of a beam splitter, the light signal of 4 ports of access is extracted to preset proportion, and the low light level signal being drawn into is converted to weak current signal; Signal condition part, is converted to weak voltage signal for the weak current signal that Dim light measurement circuit is produced, and after voltage amplification, compares with preset optical signal detecting thresholding, obtains corresponding Digital Logic; Single-chip Controlling part, for the Digital Logic producing by signal condition part, obtains the running status of 4 ports.
Further, in described Single-chip Controlling part, judging under out of order prerequisite, determine non-working port by localization method, finally notify user concrete fault message by alarm and failure indication module.
Further again, in described localization method, adopt 4 bits to represent the operating state of 4 ports of single-fiber three-way multiplexer, " 1 " indicates light, " 0 " represents unglazed.4 bits represent respectively from highest order to lowest order: com port, 1550nm port, 1490nm port and 1310nm port, the operating state of system is divided into 4 kinds, that is: " initial condition ", " normal operating conditions ", " detected state " and " abnormality ".Every kind of operating state all has different state spaces;
" initial condition " is " 0000 ", if the operating state that system detects is under the jurisdiction of x1, system is switched to " normal operating conditions " by " initial condition " so.Wherein, x1 comprises 10 kinds of possible states: " 0000 ", " 0001 ", " 1000 ", " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 ".
In " normal operating conditions ", if the operating state that system detects is under the jurisdiction of x2, system remains on " normal operating conditions " so, wherein, x2 comprises 7 kinds of possible states: " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 ".In " normal operating conditions ", system is provided with respectively counter i for state group 1, state group 2 and state group 3, counter j sum counter k, and wherein state group 1 comprises 3 kinds of possible states: " 1001 ", " 1011 ", " 1101 "; State group 2 comprises 3 kinds of possible states: " 1010 ", " 1011 ", " 1110 "; State group 3 comprises 3 kinds of possible states: " 1100 ", " 1101 ", " 1110 "; If overflow status has appearred in any one counter, the operating state of system is switched to " detected state " by " normal operating conditions " so.If system has detected state " 0000 " or " 0001 " or " 1000 ", the operating state of system is switched to " abnormality " by " normal operating conditions " so;
In " detected state ", the state space of system is x3, and it comprises 3 kinds of possible states: " 1001 ", " 1010 ", " 1100 ".Meanwhile, counter i is to state " 1001 " counting, and counter j is to state " 1010 " counting, and counter k counts state " 1100 ".For example, if (operating state of system is switched to " abnormality " by " detected state " to any one counter so for i, j or k) occurred overflow status (count value has reached 255).
In " abnormality ", if the state receiving is " 0001 ", be judged to be so com port failure; If the state receiving is " 0000 ", be judged to be so 1310nm port failure; If the state receiving is " 1000 ", be judged to be so 1490 ports or 1550 port failures; If counter i overflows, be judged to be so 1490nm port or 1550nm port failure; If counter j overflows, be judged to be so 1310nm port or 1550nm port failure; If counter k overflows, be judged to be so 1310nm port or 1490nm port failure.
Further, described alarm and failure indication module comprise 4 paths of LEDs and buzzer, and wherein, in normal operating conditions, 4 paths of LEDs are in illuminating state, and buzzer is quiet; Nonserviceable, the LED of corresponding non-working port is in extinguishing state, buzzer call.
Described Dim light measurement circuit comprises InGaAs photodiode and accessory circuit thereof, and wherein accessory circuit comprises current-limiting resistance and the reverse biased circuit of InGaAs photodiode.
Described signal condition part comprises secondary operational amplification circuit, voltage comparator circuit and A/D conversion circuit.
Described secondary operational amplification circuit is by the fixing multiplication factor circuit of one-level and the adjustable multiplication factor the electric circuit constitute of one-level, and described voltage comparator circuit is 4 road integrated form voltage comparators, and described A/D conversion circuit adopts 8 D/A conversion chips.
Described Single-chip Controlling part comprises main control chip, and the power module, crystal oscillator module, ISP download module, FLASH module and the E2PROM module that are connected with described main control chip.
Technical conceive of the present invention is: in the use procedure of the automatic fault detection module for single-fiber three-way multiplexer, because local side is different from the transmission range of single-fiber three-way multiplexer, or adopted optical fiber or connector that loss degree is different, the power of the light signal of 4 ports of access single-fiber three-way multiplexer probably has larger difference.Therefore,, if adopt single or fixing optical signal detecting thresholding, the probably accuracy of detection of restriction system, even causes wrong differentiation.So novel in design, for the process of the multiport automatic fault detection system of single-fiber three-way multiplexer, dynamic optical signal detecting thresholding is a very crucial sport technique segment.
The present invention is clear and definite taking " port status " as detecting the testing mechanism of target, that is: for one by the 1310nm for connecting user side, 1490nm and 1550nm port, and the single-fiber three-way multiplexer of multiplexing port (com port) composition of connection local side, the detection target of system is: detect the running status of these 4 ports, and locate fast concrete non-working port in the time that fault occurs.
This system can dynamically regulate corresponding sensed light signal judgement threshold according to the intensity size of sampled light power, thereby has possessed wider luminous power detection range.Meanwhile, clearly defined 4 type systematic operating states, that is: " initial condition ", " normal operating conditions ", " detected state " and " abnormality ", and designed corresponding Fault Locating Method, thus improve accuracy of detection and the reliability of system.
Beneficial effect of the present invention is mainly manifested in: 1. increased detection of dynamic light threshold function, thereby effectively expanded the detection range of system luminous power; 2. detection of dynamic optical gate limit is used in conjunction with the secondary operational amplification circuit in signal conditioning circuit, can effectively improve the accuracy of detection of system, reduces the probability of erroneous judgement; 3. clear and definite Fault Locating Method is conducive to writing of systems soft ware, improves the execution efficiency of code.
Brief description of the drawings
Fig. 1 is the port connection diagram of single-fiber three-way multiplexer.
Fig. 2 is the application schematic diagram of multiport automatic fault detection system.
Fig. 3 is the hardware block diagram of multiport automatic fault detection system.
Fig. 4 is the state transition diagram of localization method in multiport automatic fault detection system.
Fig. 5 is the state space of localization method in multiport automatic fault detection system.
Fig. 6 is the application schematic diagram of multiport automatic fault detection system in FTTB scene.
Fig. 7 is the application schematic diagram of multiport automatic fault detection system in FTTH scene.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1～Fig. 7, a kind of multiport automatic fault detection system for single-fiber three-way multiplexer, comprise: Dim light measurement circuit, for under the cooperation of a beam splitter, the light signal of 4 ports of access is extracted to preset proportion, and the low light level signal being drawn into is converted to weak current signal; Signal condition part, is converted to weak voltage signal for the weak current signal that Dim light measurement circuit is produced, and after voltage amplification, compares with preset optical signal detecting thresholding, obtains corresponding Digital Logic; Single-chip Controlling part, for the Digital Logic producing by signal condition part, obtains the running status of 4 ports.
Conventional single-fiber three-way multiplexer is by the 1310nm for connecting user side, 1490nm and 1550nm port, and connect multiplexing port (com port) composition of local side.And for the multiport automatic fault detection system of single-fiber three-way multiplexer, under the condition of beam splitter that adds 4 95: 5 (or 90: 10), can complete the real-time detection to 1310nm, 1490nm, 1550nm port and com port, and when above-mentioned port breaks down, what system can be to fault carries out alarm and location.
The described multiport automatic fault detection system for single-fiber three-way multiplexer, comprises Dim light measurement circuit, signal condition part and Single-chip Controlling part.Described Dim light measurement circuit is under the cooperation of the beam splitter of 95: 5 (or 90: 10), the light signal of 4 ports of access is extracted to 5% (or 10%) ratio, and the low light level signal being drawn into is converted to weak current signal; The weak circuit signal that described signal condition part produces Dim light measurement circuit is converted to weak voltage signal, and after suitable voltage amplification, compares with preset optical signal detecting thresholding, obtains corresponding Digital Logic; The Digital Logic that described Single-chip Controlling part produces by signal condition part, obtain the running status of 4 ports, and judging under out of order prerequisite, determine non-working port by relevant Fault Locating Method, finally notify user concrete fault message by alarm and failure indication module.
Described Dim light measurement circuit comprises InGaAs photodiode and accessory circuit thereof, and wherein accessory circuit comprises current-limiting resistance and the reverse biased circuit of InGaAs photodiode.The operating wavelength range of this InGaAs photodiode of General Requirements is: 1100nm-1650nm, responsiveness is 0.8-0.9A/W.
Described signal condition part comprises secondary operational amplification circuit, voltage comparator circuit and analog/digital (D/A) change-over circuit.
Described secondary operational amplification circuit is by the fixing multiplication factor circuit of one-level and the adjustable multiplication factor the electric circuit constitute of one-level, and the overall multiplication factor of amplifying circuit is 1000.Described voltage comparator circuit is 4 road integrated form voltage comparators, can be operated in single supply or duplicate supply pattern, can adopt unified or reference comparison voltages independently.Described A/D conversion circuit adopts 8 D/A conversion chips, and the voltage range that can export under the control of single chip machine controlling circuit is: the reference voltage of 0-D/A chip.
Described Single-chip Controlling part comprises main control chip, and the power module, crystal oscillator module, ISP download module, FLASH module, E2PROM module and alarm and the failure indication module that are connected with described main control chip.
Described alarm and failure indication module comprise 4 paths of LEDs and buzzer, and wherein, in normal operating conditions, 4 paths of LEDs are in illuminating state, and buzzer is quiet; Nonserviceable, the LED of corresponding non-working port is in extinguishing state, buzzer call.
Described Fault Locating Method adopts 4 bits to represent the operating state of 4 ports of single-fiber three-way multiplexer, and " 1 " indicates light, and " 0 " represents unglazed.4 bits represent respectively from highest order to lowest order: com port, 1550nm port, 1490nm port and 1310nm port.The operating state of system is divided into 4 kinds, that is: " initial condition ", " normal operating conditions ", " detected state " and " abnormality ".Every kind of operating state all has different state spaces.In " normal operating conditions ", system is provided with respectively counter i for state group 1, state group 2 and state group 3, counter j sum counter k, and wherein state group 1 comprises 3 kinds of possible states: " 1001 ", " 1011 ", " 1101 "; State group 2 comprises 3 kinds of possible states: " 1010 ", " 1011 ", " 1110 "; State group 3 comprises 3 kinds of possible states: " 1100 ", " 1101 ", " 1110 "; In " abnormality ", if the state receiving is " 0001 ", be judged to be so com port failure; If the state receiving is " 0000 ", be judged to be so 1310nm port failure; If the state receiving is " 1000 ", be judged to be so 1490 ports or 1550 port failures; If counter i overflows, be judged to be so 1490nm port or 1550nm port failure; If counter j overflows, be judged to be so 1310nm port or 1550nm port failure; If counter k overflows, be judged to be so 1310nm port or 1490nm port failure.
Described state space mainly comprises two parts, state space x1 and the system that is switched to " normal operating conditions " by " initial condition " remains on the state space x2 of " normal operating conditions ", and wherein x1 comprises 10 kinds of possible states: " 0000 ", " 0001 ", " 1000 ", " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 "; X2 comprises 7 kinds of possible states: " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 ".
Example 1: as shown in Figure 6, for some common community or office building, technology that Fiber To The Building (FTTB) is a kind of low cost Access Network scheme that improves access bandwidth.In general, for Yi Zhuan building, can configure a single-fiber three-way multiplexer, can adopt the local area network technology such as Fast Ethernet or WLAN (wireless local area network) access user in the downstream of single-fiber three-way multiplexer.In this case, single-fiber three-way multiplexer can be placed in distributing cabinet outside building or special machine room, and at the each beam splitter that 95: 5 (or 90: 10) are installed of 4 ports.Multiport automatic fault detection system obtains sampled light signal by these 4 beam splitters, and detects in real time the operating state of these 4 ports.Because the space of distributing cabinet or Special machine room is relatively sufficient, therefore, in the applied environment of FTTB, can adopt the beam splitter of discrete to coordinate multiport automatic fault detection system to use.
Example 2: as shown in Figure 7, for some high-grade community or commercial center, technology that Fiber to the home (FTTH) is to provide effective Access Network scheme of optimum network bandwidth.In this case, each family or office can configure a single-fiber three-way multiplexer, and single-fiber three-way multiplexer is directly connected with subscriber terminal equipment.In order to reduce the placement space of equipment, in the applied environment of FTTH, generally adopt the beam splitter of integrated form to coordinate multiport automatic fault detection system to use.
Content described in the present embodiment is only enumerating of way of realization to inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (1)
1. for the localization method of the non-working port of the multiport automatic fault detection system of single-fiber three-way multiplexer, be applicable to the multiport automatic fault detection system of following single-fiber three-way multiplexer:
Dim light measurement circuit, under the cooperation at a beam splitter, extracts preset proportion by the light signal of 4 ports of access, and the low light level signal being drawn into is converted to weak current signal;
Signal condition part, is converted to weak voltage signal for the weak current signal that Dim light measurement circuit is produced, and after voltage amplification, compares with preset optical signal detecting thresholding, obtains corresponding Digital Logic;
Single-chip Controlling part, for the Digital Logic producing by signal condition part, obtains the running status of 4 ports;
In described Single-chip Controlling part, judging under out of order prerequisite, determine non-working port by localization method, finally notify user concrete fault message by alarm and failure indication module; It is characterized in that: in described localization method, adopt 4 bits to represent the operating state of 4 ports of single-fiber three-way multiplexer, " 1 " indicates light, and " 0 " represents unglazed; 4 bits represent respectively from highest order to lowest order: com port, 1550nm port, 1490nm port and 1310nm port, the operating state of system is divided into 4 kinds, that is: " initial condition ", " normal operating conditions ", " detected state " and " abnormality "; Every kind of operating state all has different state spaces;
" initial condition " is " 0000 ", if the operating state that system detects is under the jurisdiction of x1, system is switched to " normal operating conditions " by " initial condition " so; Wherein, x1 comprises 10 kinds of possible states: " 0000 ", " 0001 ", " 1000 ", " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 ";
In " normal operating conditions ", if the operating state that system detects is under the jurisdiction of x2, system remains on " normal operating conditions " so, wherein, x2 comprises 7 kinds of possible states: " 1001 ", " 1010 ", " 1011 ", " 1100 ", " 1101 ", " 1110 ", " 1111 ".In " normal operating conditions ", system is provided with respectively counter i for state group 1, state group 2 and state group 3, counter j sum counter k, and wherein state group 1 comprises 3 kinds of possible states: " 1001 ", " 1011 ", " 1101 "; State group 2 comprises 3 kinds of possible states: " 1010 ", " 1011 ", " 1110 "; State group 3 comprises 3 kinds of possible states: " 1100 ", " 1101 ", " 1110 "; If overflow status has appearred in any one counter, the operating state of system is switched to " detected state " by " normal operating conditions " so; If system has detected state " 0000 " or " 0001 " or " 1000 ", the operating state of system is switched to " abnormality " by " normal operating conditions " so;
In " detected state ", the state space of system is x3, and it comprises 3 kinds of possible states: " 1001 ", " 1010 ", " 1100 "; Meanwhile, counter i is to state " 1001 " counting, and counter j is to state " 1010 " counting, and counter k counts state " 1100 "; If (operating state of system is switched to " abnormality " by " detected state " to any one counter so for i, j or k) occurred overflow status;
In " abnormality ", if the state receiving is " 0001 ", be judged to be so com port failure; If the state receiving is " 0000 ", be judged to be so 1310nm port failure; If the state receiving is " 1000 ", be judged to be so 1490 ports or 1550 port failures; If counter i overflows, be judged to be so 1490nm port or 1550nm port failure; If counter j overflows, be judged to be so 1310nm port or 1550nm port failure; If counter k overflows, be judged to be so 1310nm port or 1490nm port failure.
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| CN104144012B (en) * | 2013-05-10 | 2017-03-29 | 中国电信股份有限公司 | A kind of optical property detecting system and method for FTTx access networks |
| CN104967478B (en) * | 2015-06-30 | 2018-06-12 | 国网山东省电力公司济南供电公司 | A kind of intelligent substation luminous power test is divided adapter with multichannel |
| CN106357328B (en) * | 2016-08-26 | 2018-08-10 | 四川九州电子科技股份有限公司 | Set-top box input optical power detection device |
| CN109407000B (en) * | 2017-08-17 | 2024-03-15 | 中国航发商用航空发动机有限责任公司 | Alternator fault detection circuit and method |
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Effective date of registration: 20200427 Address after: 311400 Golf Road 608, Dongzhou street, Fuyang District, Zhejiang, Hangzhou Patentee after: ZHEJIANG FUCHUNJIANG PHOTO-ELECTRONIC SCIENCE & TECHNOLOGY Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui District Six Patentee before: ZHEJIANG UNIVERSITY OF TECHNOLOGY |