CN102118193A - Passive optical network fault diagnosis system based on optical line terminal module - Google Patents
Passive optical network fault diagnosis system based on optical line terminal module Download PDFInfo
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- CN102118193A CN102118193A CN201110005608XA CN201110005608A CN102118193A CN 102118193 A CN102118193 A CN 102118193A CN 201110005608X A CN201110005608X A CN 201110005608XA CN 201110005608 A CN201110005608 A CN 201110005608A CN 102118193 A CN102118193 A CN 102118193A
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Abstract
The invention relates to a passive optical network fault diagnosis system based on an optical line terminal module. The passive optical network fault diagnosis system comprises a fault report module and a positioning controller which are communicated, wherein the fault report module is used for generating a fault diagnosis signal according to an obtained alarm signal generated by an optical fiber cable terminal device, generating a false alarm signal according to the fault diagnosis signal and reporting the fault diagnosis signal and the false alarm signal; and the positioning controller is used for obtaining an alarm triggering time point according to the obtained on-position time sequence information of an online optical network unit and the false alarm signal and then positioning a fault according to the alarm triggering time point and the fault diagnosis signal. In the passive optical network fault diagnosis system based on the optical line terminal module, the fault report module is utilized to generate the fault diagnosis signal according to the alarm signal generated by the optical fiber cable terminal device and then generate the false alarm signal, and the positioning controller obtains the alarm triggering time point according to the on-position time sequence information and the false alarm signal and positions the fault by combining with the fault diagnosis signal.
Description
[technical field]
The present invention relates to field of optical networks, particularly a kind of passive optical network fault diagnostic system based on the optical line terminal module.
[background technology]
Optical fiber inserts the preferred manner that will become Access Network in following a period of time.Passive optical network technique becomes the highest technical scheme of cost performance in the Optical Access Network construction.Each terminal optical network unit (Optical Network Unit, be called for short ONU) at EPON (Passive Optical Network, be called for short PON) finish registration in the system after, optical fiber cable termination equipment (Optical Line Terminal, be called for short OLT) can distribute a time slot for each ONU, only allow each ONU with its time slot corresponding in to OLT emission light signal, all the other times then are in off state, in whole communication process, in arbitrary time slot, local side OLT can only receive uploading signal and it being handled of an ONU, uploads light signal and can not accept two and plural ONU simultaneously.
Based on top situation, two kinds of phenomena of the failure might take place: the one, rogue ONU: a certain terminal ONU breaks down, no longer be subjected to the control of local side OLT, be in continuous luminance always, to cause OLT work schedule confusion, other ONU in the system can't finish normal data transfer with OLT; The 2nd, ONU goes offline: because certain reason causes OLT to receive the corresponding light signal that ONU transmitted on corresponding sequential, be in the empty window state of a kind of sequential, also will have influence on the upload behavior of terminal to local side.
[summary of the invention]
Based on this, be necessary to provide a kind of passive optical network fault diagnostic system, accurately locating network fault based on the optical line terminal module.
A kind of passive optical network fault diagnostic system based on the optical line terminal module, comprise the fault reporting module and the register control that are connected by communication, the alarm signal that described fault reporting module is used for producing according to the optical fiber cable termination equipment that obtains generates fault diagnosis signal, according to described fault diagnosis signal generation error warning signal, and with fault diagnosis signal and false alarm signal reporting, described register control obtains warning triggered time point according to the time sequence information on the throne and the false alarm signal of the online optical network unit that obtains, and carries out fault location according to described warning triggered time point and fault diagnosis signal again.
Preferably, described fault reporting module comprises that the diagnosis of rogue's optical network unit reports sub-function module, the optical network unit that goes offline diagnosis reports sub-function module and logic sum gate, described rogue's optical network unit diagnosis reports sub-function module and the optical network unit diagnosis that goes offline reports sub-function module respectively the alarm signal that optical terminus equipment produces to be diagnosed the generation fault diagnosis signal, and described fault diagnosis signal is reported to described register control; Described logic sum gate is asked described fault diagnosis signal or is handled and obtains described false alarm signal, and described false alarm signal reporting is arrived described register control.
Preferably, the diagnosis of described rogue's optical network unit reports sub-function module to comprise the unit that reports of the diagnosis unit of rogue's optical network unit of electrical connection and rogue's optical network unit, the alarm signal that the diagnosis unit collection optical fiber cable termination device interior of described rogue's optical network unit produces is determined the sequential of alarm signal, whether the sequential of judging this alarm signal is normal, and generates control signal and control the unit that reports of described rogue's optical network unit and report the state of rogue's optical network unit.
Preferably, described EPON is an Ethernet passive optical network, the diagnosis unit of described rogue's optical network unit comprises that first judges the discharge circuit and the first replacement charging circuit, described first judges that discharge circuit comprises first discharge resistance and first storage capacitor, the described first replacement charging circuit is in parallel with described first discharge resistance, described first discharge resistance, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described first discharge resistance is electrically connected the output of place as the described first judgement discharge circuit with described first storage capacitor.
Preferably, the described first replacement charging circuit comprises the first positive-negative-positive triode and the first charging biasing resistor, described first discharge resistance is connected in parallel between the emitter and collector of the described first positive-negative-positive triode, the collector electrode of the described first positive-negative-positive triode is by the described first storage capacitor ground connection, the base stage of the described first positive-negative-positive triode is by the described first charging biasing resistor ground connection, and the emitter of the described first positive-negative-positive triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
Preferably, the described first replacement charging circuit comprises first divider resistance and second divider resistance of a P type metal-oxide-semiconductor, series connection, described first discharge resistance is connected in parallel between the source electrode and drain electrode of a described P type metal-oxide-semiconductor, the source electrode of a described P type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of a described P type metal-oxide-semiconductor is electrically connected the link of described first divider resistance and second divider resistance.
Preferably, the unit that reports of described rogue's optical network unit comprises first analog switch, first sampling resistor and the first logic reversal device, the input of described first analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of first analog switch is electrically connected with an end of described first sampling resistor, the input of the first logic reversal device respectively, the other end of described first sampling resistor is electrically connected to ground, and the control end of first analog switch and described first judges that the output of discharge circuit is electrically connected; The output of the described first logic reversal device is the output that reports the unit of rogue's optical network unit.
Preferably, the described optical network unit that goes offline is diagnosed the diagnosis unit of the optical network unit that goes offline that reports sub-function module to comprise electrical connection and the unit that reports of the optical network unit that goes offline, the alarm signal that the diagnosis unit collection optical fiber cable termination device interior of the described optical network unit that goes offline produces is determined the sequential of alarm signal, whether the sequential of judging this alarm signal is normal, and generates the state that reports the unit to report to go offline optical network unit of the described optical network unit that goes offline of control signal control.
Preferably, described EPON is an Ethernet passive optical network, the diagnosis unit of the described optical network unit that goes offline comprises that first judges the charging circuit and the first replacement discharge circuit, described first judges that charging circuit comprises first charging resistor and second storage capacitor, the described first replacement discharge circuit is in parallel with described first charging resistor, described first charging resistor, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described first charging resistor is electrically connected the output of place as the described first judgement charging circuit with described second storage capacitor.
Preferably, the described first replacement discharge circuit comprises a NPN type triode and the first discharge biasing resistor, described first charging resistor is connected in parallel between the emitter and collector of a described NPN type triode, and the collector electrode of a described NPN type triode is by the described second storage capacitor ground connection; The base stage of a described NPN type triode is by the described first discharge biasing resistor external power supply; The emitter of a described NPN type triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
Preferably, the described first replacement discharge circuit comprises a N type metal-oxide-semiconductor, the 3rd divider resistance and the 4th divider resistance, described first charging resistor is connected in parallel between the source electrode and drain electrode of a described N type metal-oxide-semiconductor, the source electrode of a described N type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of a described N type metal-oxide-semiconductor is electrically connected the link of described the 3rd divider resistance and the 4th divider resistance.
Preferably, the unit that reports of the described optical network unit that goes offline comprises second analog switch and second sampling resistor, the input of described second analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of described second analog switch and second sampling resistor, one end connecting place report the unit output as the optical network unit that goes offline, the other end ground connection of described second sampling resistor, the control end of described second analog switch and described first judges that the output of charging circuit is electrically connected.
Preferably, described EPON is a gigabit passive optical network, the diagnosis unit of described rogue's optical network unit comprises that second judges the charging circuit and the second replacement discharge circuit, described second judges that charging circuit comprises second charging resistor and the 3rd storage capacitor, the described second replacement discharge circuit is in parallel with described second charging resistor, described second charging resistor, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described second charging resistor is electrically connected the output of place as the described second judgement charging circuit with described the 3rd storage capacitor.
Preferably, the described second replacement discharge circuit comprises the 2nd NPN type triode and the second discharge biasing resistor, described second charging resistor is connected in parallel between the emitter and collector of described the 2nd NPN type triode, and the collector electrode of described the 2nd NPN type triode is by described the 3rd storage capacitor ground connection; The base stage of described the 2nd NPN type triode is by the described second discharge biasing resistor external power supply; The emitter of described the 2nd NPN type triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
Preferably, the described second replacement discharge circuit comprises the 2nd N type metal-oxide-semiconductor, the 5th divider resistance and the 6th divider resistance, described second charging resistor is connected in parallel between the source electrode and drain electrode of described the 2nd N type metal-oxide-semiconductor, the source electrode of described the 2nd N type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of described the 2nd N type metal-oxide-semiconductor is electrically connected the link of described the 5th divider resistance and the 6th divider resistance.
Preferably, the unit that reports of described rogue's optical network unit comprises the 3rd analog switch and the 3rd sampling resistor, the input of described the 3rd analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of described the 3rd analog switch and the 3rd sampling resistor one end connecting place report the unit output as rogue's optical network unit, the other end ground connection of described the 3rd sampling resistor, the control end of described the 3rd analog switch and described second judges that the output of charging circuit is electrically connected.
Preferably, described EPON is a gigabit passive optical network, the diagnosis unit of the described optical network unit that goes offline comprises that second judges the discharge circuit and the second replacement charging circuit, described second judges that discharge circuit comprises second discharge resistance and the 4th storage capacitor, the described second replacement charging circuit is in parallel with described second discharge resistance, described second discharge resistance, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described second discharge resistance is electrically connected the output of place as the described second judgement discharge circuit with described the 4th storage capacitor.
Preferably, the described second replacement charging circuit comprises the second positive-negative-positive triode and the second charging biasing resistor, described second discharge resistance is connected in parallel between the emitter and collector of the described second positive-negative-positive triode, the collector electrode of the described second positive-negative-positive triode is by described the 4th storage capacitor ground connection, the base stage of the described second positive-negative-positive triode is by the described second charging biasing resistor ground connection, and the emitter of the described second positive-negative-positive triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
Preferably, the described second replacement charging circuit comprises the 7th divider resistance and the 8th divider resistance of the 2nd P type metal-oxide-semiconductor, series connection, described second discharge resistance is connected in parallel between the source electrode and drain electrode of described the 2nd P type metal-oxide-semiconductor, the source electrode of described the 2nd P type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, the grid of described the 2nd P type metal-oxide-semiconductor be electrically connected the link of the 7th divider resistance and the 8th divider resistance.
Preferably, the unit that reports of the described optical network unit that goes offline comprises the 4th analog switch, the 4th sampling resistor and the second logic reversal device, the input of described the 4th analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of the 4th analog switch is electrically connected with an end of described the 4th sampling resistor, the input of the second logic reversal device respectively, the other end of described the 4th sampling resistor is electrically connected to ground, and the control end of the 4th analog switch and described second judges that the output of discharge circuit is electrically connected; The output of the described second logic reversal device is the output that reports the unit of optical network unit of going offline.
Above-mentioned passive optical network fault diagnostic system based on the optical line terminal module, adopt the fault reporting module to generate fault diagnosis signal according to the alarm signal that optical fiber cable termination equipment produces, again according to fault diagnosis signal generation error warning signal, register control draws warning triggered time point according to time sequence information on the throne and false alarm signal, carry out fault location in conjunction with fault diagnosis signal, accurately locating network fault.
[description of drawings]
Fig. 1 is based on the structural representation of the passive optical network fault diagnostic system of optical line terminal module among the embodiment;
Fig. 2 is based on the structural representation of the passive optical network fault diagnostic system of optical line terminal module among another embodiment;
Fig. 3 is the internal structure schematic diagram based on the fault reporting module of the PON fault diagnosis system of EPON OLT optical module;
Fig. 4 A is a kind of internal structure schematic diagram of the first replacement charging circuit of rogue EPON ONU diagnosis unit among Fig. 3;
Fig. 4 B is two kinds of internal structure schematic diagrames of the first replacement charging circuit of rogue EPON ONU diagnosis unit among Fig. 3;
Fig. 5 A is a kind of internal structure schematic diagram of the first replacement discharge circuit of the EPON ONU diagnosis unit that goes offline among Fig. 3;
Fig. 5 B is two kinds of internal structure schematic diagrames of the first replacement discharge circuit of the EPON ONU diagnosis unit that goes offline among Fig. 3;
Fig. 6 is the internal structure schematic diagram based on the fault reporting module of the PON fault diagnosis system of GPON OLT optical module;
Fig. 7 A is a kind of internal structure schematic diagram of the second replacement discharge circuit of rogue GPON ONU diagnosis unit among Fig. 6;
Fig. 7 B is two kinds of internal structure schematic diagrames of the second replacement discharge circuit of rogue GPON ONU diagnosis unit among Fig. 6;
Fig. 8 A is a kind of internal structure schematic diagram of the second replacement charging circuit of the GPON ONU diagnosis unit that goes offline among Fig. 6;
Fig. 8 B is two kinds of internal structure schematic diagrames of the second replacement charging circuit of the GPON ONU diagnosis unit that goes offline among Fig. 6.
[embodiment]
Below in conjunction with specific embodiment and accompanying drawing technical scheme is described in detail.
As shown in Figure 1, among the embodiment, a kind of passive optical network fault diagnostic system based on the optical line terminal module comprises the fault reporting module 100 and the register control 200 that are connected by communication.Fault reporting module 100 is used for the optical fiber cable termination equipment that obtains (Optical Line Terminal, abbreviation OLT) the alarm signal diagnosis that produces generates fault diagnosis signal, according to this fault diagnosis signal generation error warning signal, and with fault diagnosis signal and false alarm signal reporting, register control 200 receiving alarm signals, fault diagnosis signal, false alarm signal and online optical network unit (Optical Network Unit, abbreviation ONU) time sequence information on the throne, and obtain warning triggered time point according to the time sequence information on the throne of online ONU and false alarm signal, carry out fault location according to warning triggered time point and fault diagnosis signal.
Alarm signal is the signal that the periodicity sent by optical network unit repeats, and when optical network unit broke down, as luminous (rogue ONU) or continue to go offline (ONU goes offline) always, alarm signal became lasting high level or low level.
Fault diagnosis signal is according to the resulting status signal of the situation of alarm signal, as indication rogue ONU or the indication ONU that goes offline, can all represent with high level or low level.
The false alarm signal is to handle the alarm signal that obtains according to fault diagnosis signal, as rogue ONU or the ONU that goes offline warning occur, and available high level is represented.
As shown in Figure 2, above-mentioned passive optical network fault diagnostic system based on the optical line terminal module also comprises logic sum gate.Fault reporting module 100 comprises that rogue's optical network unit (ONU) diagnosis reports sub-function module 110 and the optical network unit diagnosis that goes offline reports sub-function module 120.The alarm signal that rogue ONU diagnosis reports 110 couples of OLT of sub-function module to produce is diagnosed and is generated rogue's fault diagnosis signal, the alarm signal that the ONU that goes offline diagnosis reports 120 couples of OLT of sub-function module to produce is diagnosed and is generated the fault diagnosis signal that goes offline, fault diagnosis signal is reported to register control 200, logic sum gate is asked or is handled and obtain the false alarm signal the rogue's fault diagnosis signal and the fault diagnosis signal that goes offline, with the false alarm signal reporting to register control 200.
Rogue ONU diagnosis reports sub-function module 110 to comprise that the diagnosis unit 1102 of rogue ONU of electrical connection and rogue ONU's reports unit 1104.The diagnosis unit 1102 of rogue ONU is gathered the sequential that the inner alarm signal that produces of OLT is determined alarm signal, judges whether the sequential of this alarm signal is normal, and the unit 1104 that reports of generation control signal control rogue ONU reports the state of rogue ONU.When the sequential of alarm signal just often, the unit 1104 that reports of rogue ONU reports the low level state signal; When the sequential of alarm signal was unusual, the unit 1104 that reports of rogue ONU reported the high level state signal.
What the ONU that goes offline diagnosis reported that sub-function module 120 comprises the diagnosis of the optical network unit that goes offline of electrical connection single 1202 yuan and the optical network unit that goes offline reports unit 1204.The diagnosis unit 1202 of ONU of going offline is gathered the sequential that alarm signal that the optical fiber cable termination device interiors produce is determined alarm signal, whether the sequential of judging this alarm signal is normal, and generates the go offline unit 1204 that reports of ONU of control signal control and report the state of the ONU that goes offline.When the sequential of alarm signal just often, the unit 1204 that reports of the ONU that goes offline reports the low level state signal; When the sequential of alarm signal was unusual, the unit 1204 that reports of the ONU that goes offline reported the high level state signal.
Register control 200 receiving alarm signals, rogue's fault diagnosis signal, go offline fault diagnosis signal and false alarm signal, register control 200 is synchronous with the OLT system clock simultaneously, obtains the time sequence information on the throne of online ONU.Register control 200 is reported to the OLT system with fault location.
EPON (Passive Optical Network is called for short PON) comprises Ethernet passive optical network (Ethernet Passive Optical Network is called for short EPON) and gigabit passive optical network (Gigabit-Capable is called for short GPON).Because (EPON OLT is the LOS signal to the alarm signal of EPON OLT and GPON OLT pilot light signal power, GPON OLT is the SD signal) be opposite with going to alarm level state, so also there is opposite property in two functional modules in the deixis of the alarm signal of two kinds of OLT.
As shown in Figure 3, the fault reporting module 100 based on the PON fault diagnosis system of EPON OLT optical module comprises that rogue EPON ONU diagnosis reports sub-function module 112, the EPON ONU that goes offline diagnosis reports sub-function module 122 and logic sum gate B1.The quick LOS signal that EPON OLT produces is input to rogue EPON ONU diagnosis and reports the sub-function module 112 and the EPON ONU diagnosis that goes offline to report sub-function module 122, generate fault diagnosis signal through behind the parallel diagnosis, report fault diagnosis signal (being the error message that is comprised in the quick LOS signal) respectively, handle through logic sum gate B1 at last and finally report register control 200, whether have the ONU of non-normal working to determine the EPON network.
Rogue EPON ONU diagnosis reports sub-function module 112 to comprise that rogue EPON ONU diagnosis unit 1122 and rogue EPON ONU report unit 1124.Rogue EPON ONU diagnosis unit 1122 comprises that first judges the discharge circuit and the first replacement charging circuit.First judges that discharge circuit comprises the first discharge resistance R11 and the first storage capacitor C11.Rogue EPON ONU reports unit 1124 to comprise the first sampling resistor R21, the first analog switch SW21 and the first logic reversal device A1.
Shown in Fig. 4 A, the first replacement charging circuit comprises the first positive-negative-positive triode Q11 and the first charging biasing resistor R12.
Rogue EPON ONU diagnosis reports the annexation of each device of inside of sub-function module 112 to be: the first discharge resistance R11 is connected in parallel between the emitter and collector of the first positive-negative-positive triode Q11, the collector electrode of the first positive-negative-positive triode Q11 is by the first storage capacitor C11 ground connection, and the collector electrode of the first positive-negative-positive triode Q11 is as the output of the first replacement charging circuit; The first discharge resistance R11 connect with the first storage capacitor C11 o'clock as first output of judging discharge circuit; The base stage of the first positive-negative-positive triode Q11 is by the first charging biasing resistor R12 ground connection, and the emitter of the first positive-negative-positive triode Q11 is electrically connected BURST LOS signal; The input of the first analog switch SW21 receives BURST LOS signal, the output of the first analog switch SW21 is electrically connected with the end of the first sampling resistor R21, the input of the first logic reversal device A1 respectively, the control end of the first analog switch SW21 and first judges that the output of discharge circuit is electrically connected the other end ground connection of the first sampling resistor R21.
Shown in Fig. 4 B, the first replacement charging circuit comprises the first divider resistance R13 and the second divider resistance R14 of a P type metal-oxide-semiconductor Q12, series connection.
The annexation of each device of inside of rogue EPON ONU diagnosis unit 1122 is: the first discharge resistance R11 is connected in parallel between the source electrode and drain electrode of a P type metal-oxide-semiconductor Q12, the source electrode of the one P type metal-oxide-semiconductor Q12 is electrically connected BURST LOS signal, and the grid of a P type metal-oxide-semiconductor Q2 is electrically connected the link of the first divider resistance R13 and the second divider resistance R14; The drain electrode of the one P type metal-oxide-semiconductor Q12 is as the output of the first replacement charging circuit.
As shown in Figure 3, the EPON ONU that goes offline diagnosis reports sub-function module 122 to comprise that the diagnosis unit 1222 of the ONU that goes offline of electrical connection and the ONU's that goes offline reports unit 1224, the diagnosis unit 1222 of ONU of going offline is gathered the sequential that the inner alarm signal that produces of OLT is determined alarm signal, whether the sequential of judging this alarm signal is normal, and generates the go offline unit 1224 that reports of ONU of control signal control and report the state of the ONU that goes offline.
The diagnosis unit 1222 of ONU of going offline comprises that first judges the charging circuit and the first replacement discharge circuit, and first judges that charging circuit comprises the first charging resistor R31 and the second storage capacitor C31 of series connection.The end of the first charging resistor R31 is electrically connected BURST LOS signal, and the other end of the first charging resistor R31 is electrically connected the output of place as the second judgement charging circuit with the 3rd storage capacitor C31.
The go offline unit 1224 that reports of ONU comprises the second analog switch SW41 and the second sampling resistor R41.
Shown in Fig. 5 A, the first replacement discharge circuit comprises a NPN type triode Q31 and the first discharge biasing resistor R32.
The EPON ONU that goes offline diagnosis reports the internal components annexation of sub-function module 122 to be: the first charging resistor R31 is connected in parallel between the emitter and collector of a NPN type triode Q31, and the collector electrode of a NPN type triode Q31 is by the second storage capacitor C31 ground connection; The collector electrode of the one NPN type triode Q31 is as the output of the first replacement discharge circuit; The base stage of the one NPN type triode Q31 is by the first discharge biasing resistor R32 external power supply; The emitter of the one NPN type triode Q31 is electrically connected BURST LOS signal; The input of the second analog switch SW41 receives BURST LOS signal, the output of the second analog switch SW41 and the second sampling resistor R41, one end connecting place report unit 1224 outputs as the ONU's that goes offline, the other end ground connection of the second sampling resistor R41, the control end SW41 of second analog switch and first judges that the output of charging circuit is electrically connected.
Shown in Fig. 5 B, the first replacement discharge circuit comprises a N type metal-oxide-semiconductor Q32, piezoelectricity R33 resistance in the 3rd fen and the 4th divider resistance R34.
The internal components annexation of EPON ONU diagnosis unit 1222 of going offline is: the first charging resistor R31 is connected in parallel between the source electrode and drain electrode of a N type metal-oxide-semiconductor Q32, the source electrode of the one N type metal-oxide-semiconductor R32 is electrically connected BURST LOS signal, and the grid of a N type metal-oxide-semiconductor Q32 is electrically connected the series connection end of the 3rd divider resistance R33 and the 4th divider resistance R34; The drain electrode of the one N type metal-oxide-semiconductor Q32 is as the output of the first replacement discharge circuit.
Rogue EPON ONU fault diagnosis system work principle is:
(1) rogue EPON ONU failure diagnosis reports.
As shown in Figure 3, by the inner quick LOS signal that produces of EPON OLT optical module, judge that to first the first storage capacitor C11 in the discharge circuit carries out the periodicity quick charge by the first replacement charging circuit, the parameter of the first discharge resistance R11 is set simultaneously, make the voltage on the first storage capacitor C11 remain at high level state, thereby control first analog switch SW21 (the high level closure, low level disconnects) be in closure state, the output signal that rogue EPON ONU reports the first sampling resistor R21 in the unit 112 output low level all the time behind the first logic reversal device A1 always.After a certain moment in the EPON network begins to occur rogue ONU, then the phase in quick LOS signal should the sequential point of rogue ONU after, the LOS signal reports low level always, the high level in the time of will can not occurring guard time (Guard time) again reports.From this moment, first judges that the first discharge resistance R11 in the discharge circuit begins the first storage capacitor C11 is discharged, because the high level when Guard time no longer occurring in the later on quick LOS signal, can't finish quick LOS signal and pass through the first replacement charging circuit to the first storage capacitor C11 quick charge, the final first discharge resistance R11 powers on the first storage capacitor C11 within a certain period of time to press and is discharged to low level.At this moment, the first analog switch SW21 disconnects rapidly, and the first sampling resistor R21 is through first logic reversal device A1 output high level.Because because this rogue ONU is present in the EPON network, so report the unit to report high level after the time from then on always, promptly rogue ONU reports always, finish final false alarm signal reporting through logic sum gate B1 more later on.
In addition, the design of the RC time constant of the first judgement discharge circuit that the first discharge resistance R11 and the first storage capacitor C11 constitute need be long-time with reference to the maximum bag of the default burst of EPON network, to guarantee can not report false alarm at the maximum bag for a long time.In case owing to rogue ONU occurs in the network, then on corresponding sequential point, report the false alarm signal immediately, can utilize this signal accurately to determine the residing sequential of rogue ONU position, thereby finish the diagnosis reporting functions of rogue ONU as triggering signal.
The EPON ONU fault diagnosis system that goes offline work principle is:
(2) go offline EPON ONU diagnosis reports
As shown in Figure 3, by the inner quick LOS signal that produces of EPON OLT optical module, judge that to first the first storage capacitor C31 in the charging circuit carries out the periodicity repid discharge by the first replacement discharge circuit, the parameter of the first charging resistor R31 is set simultaneously, make the voltage on the first storage capacitor C31 remain at low level state, be in off-state thereby control the second analog switch SW41 (high level closure, low level disconnects), the second sampling resistor R41 is output low level all the time always.After a certain moment in the EPON network begins to occur going offline ONU, the sequential point of ONU that should go offline of the phase in LOS signal fast then, LOS signal reporting high level, up to the normal ONU of next time slot, the LOS signal recovers normally to report again fast.From this moment, first judges that the first charging resistor R31 in the charging circuit begins the second storage capacitor C31 is charged, because preface point is gone up and is no longer occurred low high level in the quick LOS signal at this moment, can't finish quick LOS signal and pass through the first replacement discharge circuit to the second storage capacitor C31 repid discharge, the final first charging resistor R31 goes up voltage with the second storage capacitor C31 within a certain period of time and charges to high level.At this moment, the second analog switch SW41 rapid closing, the second sampling resistor R41 exports high level, and the ONU that promptly goes offline reports, and finishes final false alarm through logic sum gate B1 again and reports.
In addition, first design of judging the RC time constant of charging circuit that the first charging resistor R31 and the second storage capacitor C31 constitute need be long-time with reference to the parcel of the default burst of EPON network, to guarantee can not report false alarm in parcel is long-time.In case, then on corresponding sequential point, report the false alarm signal immediately, can utilize this signal as the triggering signal residing sequential of the ONU position of accurately determining to go offline, thereby finish the diagnosis reporting functions of the ONU that goes offline owing to the ONU that goes offline occurs in the network.
As shown in Figure 6, the fault reporting module based on the PON fault diagnosis system of GPON OLT optical module comprises that rogue GPON ONU diagnosis reports sub-function module 114, the GPON ONU that goes offline diagnosis reports sub-function module 124 and logic sum gate B2.The quick SD signal that GPON OLT produces is input to rogue GPON ONU diagnosis and reports the sub-function module 114 and the GPON ONU diagnosis that goes offline to report sub-function module 124, generate fault diagnosis signal through behind the parallel diagnosis, report fault diagnosis signal (being the error message that is comprised in the quick SD signal) respectively, handle through logic sum gate B2 at last and finally report register control 200, whether have the ONU of non-normal working to determine the GPON network.
Rogue GPON ONU diagnosis reports sub-function module 114 to comprise that rogue GPON ONU diagnosis unit 1142 and rogue GPON ONU report unit 1144.The diagnosis unit 1142 of rogue ONU comprises that second judges the charging circuit and the second replacement discharge circuit.Second judges that charging circuit comprises the second charging resistor R51 and the 3rd storage capacitor C51 of series connection.The second charging resistor R51, one end is electrically connected BURST SD signal, and the other end of the second charging resistor R51 is electrically connected the output of place as the second judgement charging circuit with the 3rd storage capacitor C51.
Rogue GPON ONU reports unit 1144 to comprise the 3rd analog switch SW61 and the 3rd sampling resistor R61.
Shown in Fig. 7 A, the second replacement discharge circuit comprises the 2nd NPN type triode Q51 and the second discharge biasing resistor R52.
Rogue GPON ONU diagnoses the annexation between each element of inside that reports sub-function module 114 to be: the second charging resistor R51 is connected in parallel between the emitter and collector of the 2nd NPN type triode Q51, the collector electrode of the 2nd NPN type triode Q51 is by the 3rd storage capacitor C51 ground connection, and the collector electrode of the 2nd NPN type triode Q51 is as the output of the second replacement discharge circuit; The base stage of the 2nd NPN type triode Q51 is by the second discharge biasing resistor R52 external power supply, and the emitter of the 2nd NPN type triode Q51 is electrically connected BURST LOS signal; The input of the 3rd analog switch SW61 receives BURST LOS signal, the output of the 3rd analog switch SW61 and the 3rd sampling resistor R61 one end connecting place report unit 124 outputs as rogue ONU's, the other end ground connection of the 3rd sampling resistor R61, the control end of the 3rd analog switch SW61 and second judges that the output of charging circuit is electrically connected.
Shown in Fig. 7 B, the second replacement discharge circuit comprises the 2nd N type metal-oxide-semiconductor Q52, the 5th divider resistance R53 and the 6th divider resistance R54.
Annexation between each element of inside of rogue GPON ONU diagnosis unit 1142 is: the second charging resistor R51 is connected in parallel between the source electrode and drain electrode of the 2nd N type metal-oxide-semiconductor Q52, the source electrode of the 2nd N type metal-oxide-semiconductor Q52 is electrically connected BURST LOS signal, and the grid of the 2nd N type metal-oxide-semiconductor Q52 is electrically connected the link of the 5th divider resistance R53 and the 6th divider resistance R54; The other end external power supply of the 5th divider resistance R53, the other end ground connection of the 6th divider resistance R54; The drain electrode of the 2nd N type metal-oxide-semiconductor Q52 is as the output of the second replacement discharge circuit.
As shown in Figure 6, the GPON ONU that goes offline diagnosis reports sub-function module 124 to comprise that the diagnosis unit 1242 of the ONU that goes offline of electrical connection and the ONU's that goes offline reports unit 1244, the diagnosis unit 1242 of ONU of going offline is gathered the sequential that the inner alarm signal that produces of OLT is determined alarm signal, whether the sequential of judging this alarm signal is normal, and generates the go offline unit 1244 that reports of ONU of control signal control and report the state of the ONU that goes offline.
The diagnosis unit 1242 of ONU of going offline comprises that second judges the discharge circuit and the second replacement charging circuit.Second judges that discharge circuit comprises the second discharge resistance R71 and the 4th storage capacitor C71.The second discharge resistance R71, one end is electrically connected BURST SD signal, and the other end of the second discharge resistance R71 is electrically connected the output of place as the second judgement discharge circuit with the 4th storage capacitor C71.
The go offline unit 1244 that reports of ONU comprises the 4th analog switch SW81, the 4th sampling resistor R81 and the second logic reversal device A2.
Shown in Fig. 8 A, the second replacement charging circuit comprises the second positive-negative-positive triode Q71 and the second charging biasing resistor R72.
The diagnosis of ONU of going offline reports the annexation between each element of inside of sub-function module 124 to be: the second discharge resistance R71 is connected in parallel between the emitter and collector of the second positive-negative-positive triode Q71, the collector electrode of the second positive-negative-positive triode R71 is by the 4th storage capacitor C71 ground connection, the base stage of the second positive-negative-positive triode Q71 is by the second charging biasing resistor R72 ground connection, the emitter of the second positive-negative-positive triode Q71 is electrically connected BURST LOS signal, and the collector electrode of the second positive-negative-positive triode Q71 is as the output of the second replacement charging circuit; The input of the 4th analog switch SW71 receives BURST SD signal, the output of the 4th analog switch SW71 is electrically connected with the end of the 4th sampling resistor R71, the input of the second logic reversal device A2 respectively, the other end of the 4th sampling resistor R71 is electrically connected to ground, and the control end of the 4th analog switch SW71 and second judges that the output of discharge circuit is electrically connected; The output of the second logic reversal device A2 is the output that reports the unit of ONU of going offline.
Shown in Fig. 8 B, the second replacement charging circuit comprises the 7th divider resistance R73 and the 8th divider resistance R74 of the 2nd P type metal-oxide-semiconductor Q72, series connection.
The annexation that goes offline between each element of inside of diagnosis unit 1242 of ONU is: the second discharge resistance R71 is connected in parallel between the source electrode and drain electrode of the 2nd P type metal-oxide-semiconductor Q72, the source electrode of the 2nd P type metal-oxide-semiconductor Q72 is electrically connected BURST SD signal, and the grid of the 2nd P type metal-oxide-semiconductor Q72 is electrically connected the link of the 7th divider resistance R73 and the 8th divider resistance R74; The drain electrode of the 2nd P type metal-oxide-semiconductor Q72 is as the output of the 2nd P type metal-oxide-semiconductor.
GPON failure diagnosis reporting system operation principle:
(1) rogue GPON ONU diagnosis reports
As shown in Figure 6, by the inner quick SD signal that produces of GPON OLT optical module, judge that to second the 3rd storage capacitor C51 in the charging circuit carries out the periodicity repid discharge by the second replacement discharge circuit, the parameter of the second charging resistor R51 is set simultaneously, make the voltage on the 3rd storage capacitor C51 remain at low level state, thereby control the 3rd analog switch SW61 (high level closure, low level disconnects) be in off-state always, rogue GPON ONU reports in the unit 1144 the 3rd sampling resistor R61 output low level all the time.After a certain moment in the GPON network begins to occur rogue ONU, the sequential point that the phase in quick SD signal should rogue ONU then, SD signal reporting high level, because be present in the GPON network owing to this rogue ONU later on always, so the unit 1144 that reports of rogue GPON ONU reports high level after the time from then on always, promptly rogue ONU reports.From this moment, second judges that the second charging resistor R51 in the charging circuit begins the 3rd storage capacitor C51 is charged, because preface point is gone up in the quick SD signal and low level no longer occurred at this moment, can't finish quick SD signal and pass through the second replacement discharge circuit to the 3rd storage capacitor C51 repid discharge, the final second charging resistor R51 goes up voltage with the 3rd storage capacitor C51 within a certain period of time and charges to high level.At this moment, the 3rd analog switch SW61 rapid closing, the 3rd sampling resistor R61 output high level that reports unit 1144 of rogue GPON ONU, promptly rogue ONU reports, and finishes final false alarm through logic sum gate B2 again and reports.
Wherein, the design of the RC time constant of the second judgement charging circuit that the second charging resistor R51 and the 3rd storage capacitor C51 constitute need be long-time with reference to the maximum bag of the default burst of GPON network, to guarantee can not report false alarm at the maximum bag for a long time.In case owing to rogue ONU occurs in the network, then on corresponding sequential point, report the false alarm signal immediately, can utilize this signal accurately to determine the residing sequential of rogue ONU position, thereby finish the diagnosis reporting functions of rogue ONU as triggering signal.
(2) go offline GPON ONU diagnosis reports
As shown in Figure 6, by the inner quick SD signal that produces of GPON OLT optical module, judge that to second the 4th storage capacitor C71 in the discharge circuit carries out the periodicity quick charge by the second replacement charging circuit, the parameter of the second discharge resistance R71 is set simultaneously, make the voltage on the 4th storage capacitor C71 remain at high level state, thereby control the 4th analog switch SW81 (high level closure, low level disconnects) be in closure state, the output signal that reports the 4th sampling resistor R81 in the unit 1244 of the GPON ONU that goes offline output low level all the time behind the logic reversal device always.After a certain moment in the GPON network begins to occur going offline ONU, the sequential point of ONU that should go offline of the phase in SD signal fast then, SD signal reporting low level, up to the normal ONU sequential point of the next one, the SD signal recovers to report high level.From this preface point, second judges that the second discharge resistance R71 in the discharge circuit begins the 4th storage capacitor C71 is discharged, because high level no longer appears in the quick SD signal of this sequential point, can't finish quick SD signal and pass through the second replacement charging circuit to the 4th storage capacitor C71 quick charge, the final second discharge resistance R71 powers on the 4th storage capacitor C71 within a certain period of time to press and is discharged to low level.At this moment, the 4th analog switch SW81 disconnects rapidly, and the 4th sampling resistor R81 that reports unit 1244 of the GPON ONU that goes offline is through second logic reversal device A2 output high level, and the ONU that promptly goes offline reports, and finishes final false alarm through logic sum gate B2 again and reports.
Wherein, second design of judging the RC time constant of discharge circuit that the second discharge resistance R71 and the 4th storage capacitor C71 constitute need be long-time with reference to the parcel of the default burst of GPON network, to guarantee can not report false alarm in parcel is long-time.In case, then on corresponding sequential point, report the false alarm signal immediately, can utilize this signal as the triggering signal residing sequential of the ONU position of accurately determining to go offline, thereby finish the diagnosis reporting functions of the ONU that goes offline owing to the ONU that goes offline occurs in the network.
Above-mentioned passive optical network fault diagnostic system based on the optical line terminal module, adopt the fault reporting module to generate fault diagnosis signal according to the alarm signal that optical fiber cable termination equipment produces, again according to fault diagnosis signal generation error warning signal, register control draws warning triggered time point according to time sequence information on the throne and false alarm signal, carry out fault location in conjunction with fault diagnosis signal, accurately locating network fault.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (20)
1. passive optical network fault diagnostic system based on the optical line terminal module, it is characterized in that: comprise the fault reporting module and the register control that are connected by communication, the alarm signal that described fault reporting module is used for producing according to the optical fiber cable termination equipment that obtains generates fault diagnosis signal, according to described fault diagnosis signal generation error warning signal, and with fault diagnosis signal and false alarm signal reporting, described register control obtains warning triggered time point according to the time sequence information on the throne and the false alarm signal of the online optical network unit that obtains, and carries out fault location according to described warning triggered time point and fault diagnosis signal again.
2. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 1, it is characterized in that: described fault reporting module comprises that the diagnosis of rogue's optical network unit reports sub-function module, the optical network unit that goes offline diagnosis reports sub-function module and logic sum gate, described rogue's optical network unit diagnosis reports sub-function module and the optical network unit diagnosis that goes offline reports sub-function module respectively the alarm signal that optical terminus equipment produces to be diagnosed the generation fault diagnosis signal, and described fault diagnosis signal is reported to described register control; Described logic sum gate is asked described fault diagnosis signal or is handled and obtains described false alarm signal, and described false alarm signal reporting is arrived described register control.
3. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 2, it is characterized in that: the diagnosis of described rogue's optical network unit reports sub-function module to comprise the unit that reports of the diagnosis unit of rogue's optical network unit of electrical connection and rogue's optical network unit, the alarm signal that the diagnosis unit collection optical fiber cable termination device interior of described rogue's optical network unit produces is determined the sequential of alarm signal, whether the sequential of judging this alarm signal is normal, and generates control signal and control the unit that reports of described rogue's optical network unit and report the state of rogue's optical network unit.
4. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 3, it is characterized in that: described EPON is an Ethernet passive optical network, the diagnosis unit of described rogue's optical network unit comprises that first judges the discharge circuit and the first replacement charging circuit, described first judges that discharge circuit comprises first discharge resistance and first storage capacitor, the described first replacement charging circuit is in parallel with described first discharge resistance, described first discharge resistance, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described first discharge resistance is electrically connected the output of place as the described first judgement discharge circuit with described first storage capacitor.
5. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 4, it is characterized in that: the described first replacement charging circuit comprises the first positive-negative-positive triode and the first charging biasing resistor, described first discharge resistance is connected in parallel between the emitter and collector of the described first positive-negative-positive triode, the collector electrode of the described first positive-negative-positive triode is by the described first storage capacitor ground connection, the base stage of the described first positive-negative-positive triode is by the described first charging biasing resistor ground connection, and the emitter of the described first positive-negative-positive triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
6. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 4, it is characterized in that: the described first replacement charging circuit comprises first divider resistance and second divider resistance of a P type metal-oxide-semiconductor, series connection, described first discharge resistance is connected in parallel between the source electrode and drain electrode of a described P type metal-oxide-semiconductor, the source electrode of a described P type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of a described P type metal-oxide-semiconductor is electrically connected the link of described first divider resistance and second divider resistance.
7. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 4, it is characterized in that: the unit that reports of described rogue's optical network unit comprises first analog switch, first sampling resistor and the first logic reversal device, the input of described first analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of first analog switch respectively with an end of described first sampling resistor, the input of the first logic reversal device is electrically connected, the other end of described first sampling resistor is electrically connected to ground, and the control end of first analog switch and described first judges that the output of discharge circuit is electrically connected; The output of the described first logic reversal device is the output that reports the unit of rogue's optical network unit.
8. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 2, it is characterized in that: the described optical network unit that goes offline is diagnosed the diagnosis unit of the optical network unit that goes offline that reports sub-function module to comprise electrical connection and the unit that reports of the optical network unit that goes offline, the alarm signal that the diagnosis unit collection optical fiber cable termination device interior of the described optical network unit that goes offline produces is determined the sequential of alarm signal, whether the sequential of judging this alarm signal is normal, and generates the state that reports the unit to report to go offline optical network unit of the described optical network unit that goes offline of control signal control.
9. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 8, it is characterized in that: described EPON is an Ethernet passive optical network, the diagnosis unit of the described optical network unit that goes offline comprises that first judges the charging circuit and the first replacement discharge circuit, described first judges that charging circuit comprises first charging resistor and second storage capacitor, the described first replacement discharge circuit is in parallel with described first charging resistor, described first charging resistor, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described first charging resistor is electrically connected the output of place as the described first judgement charging circuit with described second storage capacitor.
10. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 9, it is characterized in that: the described first replacement discharge circuit comprises a NPN type triode and the first discharge biasing resistor, described first charging resistor is connected in parallel between the emitter and collector of a described NPN type triode, and the collector electrode of a described NPN type triode is by the described second storage capacitor ground connection; The base stage of a described NPN type triode is by the described first discharge biasing resistor external power supply; The emitter of a described NPN type triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
11. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 9, it is characterized in that: the described first replacement discharge circuit comprises a N type metal-oxide-semiconductor, the 3rd divider resistance and the 4th divider resistance, described first charging resistor is connected in parallel between the source electrode and drain electrode of a described N type metal-oxide-semiconductor, the source electrode of a described N type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of a described N type metal-oxide-semiconductor is electrically connected the link of described the 3rd divider resistance and the 4th divider resistance.
12. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 9, it is characterized in that: the unit that reports of the described optical network unit that goes offline comprises second analog switch and second sampling resistor, the input of described second analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of described second analog switch and second sampling resistor, one end connecting place report the unit output as the optical network unit that goes offline, the other end ground connection of described second sampling resistor, the control end of described second analog switch and described first judges that the output of charging circuit is electrically connected.
13. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 3, it is characterized in that: described EPON is a gigabit passive optical network, the diagnosis unit of described rogue's optical network unit comprises that second judges the charging circuit and the second replacement discharge circuit, described second judges that charging circuit comprises second charging resistor and the 3rd storage capacitor, the described second replacement discharge circuit is in parallel with described second charging resistor, described second charging resistor, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described second charging resistor is electrically connected the output of place as the described second judgement charging circuit with described the 3rd storage capacitor.
14. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 13, it is characterized in that: the described second replacement discharge circuit comprises the 2nd NPN type triode and the second discharge biasing resistor, described second charging resistor is connected in parallel between the emitter and collector of described the 2nd NPN type triode, and the collector electrode of described the 2nd NPN type triode is by described the 3rd storage capacitor ground connection; The base stage of described the 2nd NPN type triode is by the described second discharge biasing resistor external power supply; The emitter of described the 2nd NPN type triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
15. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 13, it is characterized in that: the described second replacement discharge circuit comprises the 2nd N type metal-oxide-semiconductor, the 5th divider resistance and the 6th divider resistance, described second charging resistor is connected in parallel between the source electrode and drain electrode of described the 2nd N type metal-oxide-semiconductor, the source electrode of described the 2nd N type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the grid of described the 2nd N type metal-oxide-semiconductor is electrically connected the link of described the 5th divider resistance and the 6th divider resistance.
16. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 13, it is characterized in that: the unit that reports of described rogue's optical network unit comprises the 3rd analog switch and the 3rd sampling resistor, the input of described the 3rd analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of described the 3rd analog switch and the 3rd sampling resistor one end connecting place report the unit output as rogue's optical network unit, the other end ground connection of described the 3rd sampling resistor, the control end of described the 3rd analog switch and described second judges that the output of charging circuit is electrically connected.
17. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 8, it is characterized in that: described EPON is a gigabit passive optical network, the diagnosis unit of the described optical network unit that goes offline comprises that second judges the discharge circuit and the second replacement charging circuit, described second judges that discharge circuit comprises second discharge resistance and the 4th storage capacitor, the described second replacement charging circuit is in parallel with described second discharge resistance, described second discharge resistance, one end is electrically connected the alarm signal that described optical fiber cable termination device interior produces, and the other end of described second discharge resistance is electrically connected the output of place as the described second judgement discharge circuit with described the 4th storage capacitor.
18. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 17, it is characterized in that: the described second replacement charging circuit comprises the second positive-negative-positive triode and the second charging biasing resistor, described second discharge resistance is connected in parallel between the emitter and collector of the described second positive-negative-positive triode, the collector electrode of the described second positive-negative-positive triode is by described the 4th storage capacitor ground connection, the base stage of the described second positive-negative-positive triode is by the described second charging biasing resistor ground connection, and the emitter of the described second positive-negative-positive triode is electrically connected the alarm signal that described optical fiber cable termination device interior produces.
19. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 17, it is characterized in that: the described second replacement charging circuit comprises the 7th divider resistance and the 8th divider resistance of the 2nd P type metal-oxide-semiconductor, series connection, described second discharge resistance is connected in parallel between the source electrode and drain electrode of described the 2nd P type metal-oxide-semiconductor, the source electrode of described the 2nd P type metal-oxide-semiconductor is electrically connected the alarm signal that described optical fiber cable termination device interior produces, the grid of described the 2nd P type metal-oxide-semiconductor be electrically connected the link of the 7th divider resistance and the 8th divider resistance.
20. the passive optical network fault diagnostic system based on the optical line terminal module according to claim 17, it is characterized in that: the unit that reports of the described optical network unit that goes offline comprises the 4th analog switch, the 4th sampling resistor and the second logic reversal device, the input of described the 4th analog switch receives the alarm signal that the optical fiber cable termination device interior produces, the output of the 4th analog switch respectively with an end of described the 4th sampling resistor, the input of the second logic reversal device is electrically connected, the other end of described the 4th sampling resistor is electrically connected to ground, and the control end of the 4th analog switch and described second judges that the output of discharge circuit is electrically connected; The output of the described second logic reversal device is the output that reports the unit of optical network unit of going offline.
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