CN103281117A - ONU automatic detection and EPON-and-GPON-adaptation method and device - Google Patents

ONU automatic detection and EPON-and-GPON-adaptation method and device Download PDF

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CN103281117A
CN103281117A CN201310205651XA CN201310205651A CN103281117A CN 103281117 A CN103281117 A CN 103281117A CN 201310205651X A CN201310205651X A CN 201310205651XA CN 201310205651 A CN201310205651 A CN 201310205651A CN 103281117 A CN103281117 A CN 103281117A
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onu
access module
signal
module
frame
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CN103281117B (en
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刘静霞
熊晴晴
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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Abstract

The invention discloses an ONU automatic detection and EPON-and-GPON-adaptation method and device, and relates to the technical field of PONs. The method comprises the steps of electrifying to start an ONU, running current access mode parameters of the ONU, judging that LOS signals of an optical link are eliminated, using the ONU to detect downlink optical signals of an OLT, setting a framing mode of a medium access control layer according to a current access mode of the ONU, running a frame delimiting state machine according to the framing mode of the medium access control layer, setting detection duration parameters, setting detection time according to the detection duration parameters, using the frame delimiting state machine to detect whether the downlink optical signals reach a frame synchronous state or not, keeping the current access mode of the ONU if the downlink optical signals reach the frame synchronous state, and replacing the current access mode of the ONU if the downlink optical signals do not reach the frame synchronous state. According to the ONU automatic detection and EPON-and-GPON-adaptation method and device, the access mode of the OLT can be automatically detected and adapted, the application range is wide, convenience is brought to use and dilatation of a communication system, and existing resources and existing layouts can be effectively used.

Description

ONU detects also method and the device of adaptive EPON, GPON automatically
Technical field
The present invention relates to PON(Passive Optical Network, passive optical-fiber network) technical field, be specifically related to a kind of ONU and detect also method and the device of adaptive EPON, GPON automatically.
Background technology
At present, broadband access technology is mainly divided into copper wire access technology and light access technology; In the light access technology, PON puts the EPON that multiple spot is the single mode bidirectional optical fiber transmission of feature.Referring to shown in Figure 1, the PON system comprises: OLT(Optical Line Terminal, optical line terminal), ODN(Optical Distribution Network, Optical Distribution Network) and at least two ONU(Optical Network Unit, optical network unit), pass through ODN transmit ascending data and downlink data between OLT and each ONU.
At present, main access way in the broadband access PON technology is generally EPON(Ethernet Passive Optical Network, Ethernet passive optical network) access technology and GPON(Gigabit Passive Optical Network gigabit passive optical network) access technology.
The upstream bandwidth of EPON access technology (hereinafter to be referred as EPON) and downlink bandwidth symmetry, upstream rate and the downstream rate of EPON are 1250Mbps; EPON follows the technical standard of IEEE802.3ah, EPON adopts MPCP(Multi-Point Control Protocol, Multi-point Control Protocol) and OAM(Operations, Administration and Maintenance, Operation Administration and Maintenance) realizes connecting and managing, the up wavelength that EPON adopts is 1310nm, and downstream wavelength is 1490nm.
Upstream bandwidth and the downlink bandwidth of GPON access technology (hereinafter to be referred as GPON) are asymmetric, and the upstream rate of GPON is 1244Mbps, and downstream rate is 2488Mbps.GPON follows the technical standard of ITU-G.984, it adopts PLOAM(Physical Layer Operations, Administration and Maintenance, physical layer operations administers and maintains) and OMCI(ONT Management and Control Interface ONT, the light regime channel interface) realize the interconnected general character and management.The up wavelength that GPON adopts is 1310nm, and downstream wavelength is 1490nm.
EPON and GPON all have great similitude at aspects such as networking form, management mode, business function and operation maintenance.Because the technology that EPON and GPON adopt is inconsistent, EPON and GPON adopt the ONU far end device also inconsistent, so existing ONU far end device only can detect and the OLT of the OLT of adaptive EPON access module or detection and adaptive GPON access module.When communication system needs dilatation, need be according to the types of adaptations of ONU far end device, configuration is applicable to the system of EPON or is applicable to the system of GPON; (original communication system employing GPON for example when the types of adaptations that the types of adaptations that adopts when original communication system and later stage dilatation are adopted is inconsistent, adopt EPON during the later stage dilatation), need to change the types of adaptations of original communication system employing or the types of adaptations that the later stage dilatation is adopted, so that the types of adaptations coupling that the types of adaptations that original communication system adopts and later stage dilatation are adopted.Therefore, the scope of application of existing ONU far end device is more single, not only bad for use and the dilatation of communication system, and is difficult to effectively utilize existing resources and layout.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide a kind of ONU to detect also method and the device of adaptive EPON, GPON automatically, it not only can detect the access module of OLT automatically, its detection speed is very fast, and can be according to the access module of the access module automatic switchover ONU of OLT, ONU can with the OLT coupling of GPON access module or EPON access module.The scope of application of the present invention is more extensive, not only is convenient to use and the dilatation of communication system, and effectively utilizes existing resources and layout.
For reaching above purpose, the technical scheme that the present invention takes is: ONU provided by the invention detects the also method of adaptive EPON, GPON automatically, it is characterized in that, may further comprise the steps: A, electrifying startup ONU, read and move the current access module parameter of ONU, the access module parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge that the LOS signal of optical link is eliminated, ONU detects the downlink optical signal of OLT; B, according to the current access module of ONU the framing mode of media access control layer is set, moves frame according to the framing mode of media access control layer and delimit state machine; C, arrange and read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimit state machine detection downlink optical signal by described frame and whether reach frame synchronization state, if, then the current access module of the current access module of mark ONU and OLT is consistent, forward step e to, otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, forwards step D to; D, the current access module of replacing ONU forward step B to; E, finish the detection of ONU and adaptive, the normal standby of ONU.
On the basis of technique scheme, after the electrifying startup ONU, further comprising the steps of in the steps A: setting in advance the access module parameter at ONU is GPON pattern or EPON pattern.
On the basis of technique scheme, step D comprised following flow process before forwarding step B to: the access module parameter that sets in advance is replaced by the current access module parameter of ONU, the detection duration parameters that sets in advance is increased to more than 1.3 times.
On the basis of technique scheme, the step of judging the LOS signal elimination of optical link in the steps A comprises: whether the LOS signal of judging optical link is eliminated in the process of ONU electrifying startup, if, the LOS signal of then determining optical link is to eliminate in the process of ONU electrifying startup, read the access module parameter that sets in advance, according to the access module parameter the current access module of ONU is set, and forwards step B to; Otherwise the LOS signal of determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal; Directly forward step B to;
The LOS signal of perhaps judging optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if, the LOS signal of then determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly forwards step B to; Otherwise the LOS signal of determining optical link is to eliminate to read the access module parameter that sets in advance in the process of ONU electrifying startup, according to the access module parameter the current access module of ONU is set, and forwards step B to.
On the basis of technique scheme, steps A is further comprising the steps of: the LOS signal of judging optical link is not eliminated, and detects the state of optical link again.
On the basis of technique scheme, step B comprises when the current access module of following flow process: ONU is the GPON access module, media access control layer is worked under the GPON of descending 2488Mbps pattern, media access control layer is according to the technical standard of ITU-G.984, and operation GPON frame is delimited state machine; When the current access module of ONU was the EPON access module, media access control layer was worked under the ethernet frame pattern of descending 1250Mbps, and media access control layer is according to the technical standard of IEEE802.3ah, and operation EPON frame is delimited state machine.
On the basis of technique scheme, the downlink optical signal that receives as if ONU among the step C reaches frame synchronization state, then record frame and delimit state machine and detect the downlink optical signal that ONU receives and reach the used time of frame synchronization state, the detection duration parameters that arranges is replaced by frame delimits state machine and detect downlink optical signal that ONU the receives detection duration parameters of used time.
On the basis of technique scheme, change the current access module of ONU among the step D and comprise when the current access module of following flow process: ONU is the GPON access module, the GPON access module is replaced by the EPON access module; When the current access module of ONU is the EPON access module, the EPON access module is replaced by the GPON access module.
Provided by the inventionly automatically detect and the device of the method for adaptive EPON, GPON based on above-mentioned ONU, it is characterized in that, comprising:
Optical link signal judge module is used for: electrifying startup ONU, and electrifying startup ONU reads and moves the current access module parameter of ONU, and the access module parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge whether the LOS signal of optical link is eliminated, if ONU receives the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal; Otherwise detect the state of optical link again;
Frame is delimited state machine operation module, be used for: after receiving the working signal of optical link signal judge module or access module handover module transmission, according to the current access module of ONU the framing mode of media access control layer is set, moves frame according to the framing mode of media access control layer and delimit state machine; Send working signal to the access module detection module;
The access module detection module is used for: after receiving the working signal of frame demarcation state machine operation module transmission, arrange and read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimiting state machine by the frame of media access control layer operation detects described downlink optical signal and whether reaches frame synchronization state, if, then the current access module of the current access module of mark ONU and OLT is consistent, send working signal to ONU standby module, otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, sends working signal to the access module handover module;
The access module handover module, be used for: after receiving the working signal of access module detection module transmission, the record frame is delimited state machine and is detected the used time of downlink optical signal that ONU receives, and the detection duration parameters that arranges is replaced by the record frame delimits state machine and detect downlink optical signal that ONU the receives duration parameters of used time; Delimit state machine operation module to frame and send working signal;
ONU standby module is used for: after receiving the working signal that access module detection module or access module handover module send, finish the detection of ONU and adaptive, the normal standby of ONU.
On the basis of technique scheme, described optical link signal judge module comprises:
Access module arranges the unit, is used for: setting in advance the access module parameter at ONU is GPON pattern or EPON pattern;
The optical link signal is eliminated state detection unit, is used for:
Judge whether the LOS signal of optical link is eliminated in the process of ONU electrifying startup, if, the LOS signal of then determining optical link is to eliminate in the process of ONU electrifying startup, read the access module parameter that sets in advance, according to the access module parameter the current access module of ONU is set, delimits state machine operation module to frame and send working signal; Otherwise the LOS signal of determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal; Directly delimit state machine operation module to frame and send working signal;
The LOS signal of perhaps judging optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if, the LOS signal of then determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly delimits state machine operation module to frame and sends working signal; Otherwise the LOS signal of determining optical link is to eliminate to read the access module parameter that sets in advance in the process of ONU electrifying startup, according to the access module parameter the current access module of ONU is set, and delimits state machine operation module to frame and sends working signal.
Described access module detection module comprises:
Detect the duration record cell, be used for: when the downlink optical signal that receives as ONU reaches frame synchronization state, the record frame is delimited state machine and is detected the used time of downlink optical signal that ONU receives, and the detection duration parameters that arranges is replaced by frame delimits the detection duration parameters that state machine detects the used time of downlink optical signal that ONU receives;
Described access module handover module comprises:
Detect the duration updating block, be used for: the access module parameter that sets in advance is replaced by the current access module parameter of ONU, the detection duration parameters that sets in advance is increased to more than 1.3 times.
Compared with prior art, beneficial effect of the present invention is:
(1) the present invention is as the LOS(loss of signal of optical link, when dropout) signal is eliminated, ONU detects the downlink optical signal of OLT, the access module current according to ONU, media access control layer is according to the technical standard of ITU-G.984(GPON access module) or the technology of IEEE802.3ah(EPON access module mark) the operation frame delimits state machine, delimit state machine by frame the detected downlink optical signal of ONU is detected.In the detection time scope, frame is delimited state machine and is detected descending smooth model and reach frame synchronization, proves that then the current access module of ONU is consistent with the access module of OLT, does not need to change the current access module of ONU; Frame is delimited state machine and is detected downlink optical signal and do not reach frame synchronization, proves that then the access module that ONU is current is inconsistent with the access module of OLT, needs the current access module of replacing ONU.The present invention can detect the access module of OLT, changes the current access module of ONU according to the access module of OLT, makes that the access module of the access module of ONU and OLT is adaptive.Therefore, can make ONU be applicable to the OLT of GPON access module and EPON access module by method of the present invention, the scope of application is more extensive, not only be convenient to use and the dilatation of communication system, and at the used access module of ONU and OLT not simultaneously, do not need to change the equipment of ONU local side, effectively utilize existing resources and layout.
When (2) the present invention uses, when having only the LOS signal elimination of optical link, ONU just carries out the detection of access module, ONU is when work, whether the LOS signal that only needs to detect optical link is eliminated, whether the access module that ONU not only can detect OLT in real time changes, and lower to the occupancy of system, is difficult for influencing user's normal use.
(3) the present invention judges when the LOS signal of optical link is eliminated, and can judge the situation of the LOS signal elimination of optical link.When the LOS signal of ONU optical link in the process of electrifying startup is eliminated, can predict that the current access module of the access module of OLT and ONU is inconsistent, after supposing the ONU electrifying startup, the access module of OLT can not change, and the access module of OLT can be predicted consistent with the access module that sets in advance.When the ONU operate as normal, the LOS signal of optical link is eliminated behind ONU plug optical fiber or replacing optical fiber, may be the deterioration of the light signal of the disconnected fibre of unexpected generation or optical link, and the access module of OLT does not change.Therefore, situation about eliminating according to the LOS signal of optical link arranges the access module of ONU and predicts ONU and the access module that OLT mates to greatest extent, can accelerate to detect the detection speed of ONU access module next time.
Used time (hereinafter to be referred as the current detection time) when (4) the present invention has recorded frame and delimits state machine and detect downlink optical signal and reach frame synchronization, and the detection duration parameters of current detection time is set to the detection duration parameters used next time.Because the detection duration parameters of current detection time is less than the detection duration parameters that sets in advance for the first time, so the detection duration parameters of current detection time is set to the detection duration parameters of use next time, can shorten the required detection time of access module of next time detecting ONU, accelerate to detect the detection speed of the required access module of ONU next time.Therefore the present invention can be fast detects and carries out adaptive with the access module of OLT the access module of ONU.
(5) the present invention with the access module parameter after adaptive as the used access module parameter of the access module that detects ONU next time; Because the access module parameter after adaptive is the accurate parameter of the required access module of ONU, therefore with the access module parameter after adaptive as the used access module parameter of the access module that detects ONU next time, not only can further guarantee the accuracy of the access module parameter that sets in advance, and can shorten detection time.
Description of drawings
Fig. 1 is the structured flowchart of conventional P ON system;
Fig. 2 is that ONU detects the also flow chart of the method for adaptive EPON, GPON automatically in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Referring to shown in Figure 2, the ONU that the embodiment of the invention provides detects the also method of adaptive EPON, GPON automatically, may further comprise the steps:
S1: electrifying startup ONU(Optical Network Unit, optical network unit), electrifying startup ONU reads and moves the current access module parameter of ONU, and the access module parameter is GPON pattern or EPON pattern; Set in advance the access module parameter at ONU, the access module parameter is set to GPON pattern or EPON pattern according to the environment of opening of concrete engineering.
S2: detect the state of optical link, judge the LOS(loss of signal of optical link, dropout) whether signal is eliminated, if then ONU detects the downlink optical signal of OLT, forwards step S3 to, otherwise re-executes step S2.
At PON(Passive Optical Network, passive optical-fiber network) in the system, the optical module that adopts is followed the SFF8472 standard, and ONU is by SFF(Small Form Factor, little encapsulation technology) optical module judges whether the LOS signal of optical link is eliminated.The SFF optical module judges that the step whether the LOS signal of optical link has been eliminated is: the RX_SD(RX signal detect of the LOS signal of optical link by the SFF optical module receives optical signal detecting) pin exports CPU(to CentralProcessingUnit, central processing unit) the control and management pin; Judge whether CPU produces interruption, if then the LOS signal of optical link is eliminated, otherwise the LOS signal of optical link is not eliminated.
2 kinds of situations that the LOS signal of optical link is eliminated are:
(1) ONU is in the process of electrifying startup, and the LOS signal of optical link is eliminated;
(2) after ONU plugged optical fiber or changes optical fiber in the process of operate as normal, the LOS signal of optical link was eliminated.
Do not belong to situation (1) if the LOS signal of optical link is eliminated, then be defaulted as situation (2) automatically.
S3: the LOS signal of determining optical link is to eliminate in the process of ONU electrifying startup, still in the process of ONU operate as normal, eliminate behind plug optical fiber or the replacing optical fiber, if the LOS signal of optical link is to eliminate in the process of ONU electrifying startup, then forward step S4 to, if the LOS signal of optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, then forward step S5 to.
Referring to shown in Figure 2, the LOS signal of determining optical link is to eliminate in the process of ONU electrifying startup, still the concrete steps of eliminating behind plug optical fiber or the replacing optical fiber in the process of ONU operate as normal are: whether the LOS signal of judging optical link is eliminated in the process of ONU electrifying startup, if then forward step S4 to; Otherwise, forward step S5 to; In actual applications, the LOS signal that can also judge optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if then forward step S5 to; Otherwise, forward step S4 to.
S4: read the access module parameter that sets in advance, the access module of ONU is set: when the access module parameter is the GPON pattern according to the access module parameter, the access module of ONU is set to the GPON pattern, when the access module parameter is the EPON pattern, the access module of ONU is set to the EPON pattern, forwards step S5 again to;
S5: according to the current access module of ONU the framing mode of MAC layer (Media Access Control, medium access control) is set, moves frame according to the framing mode of MAC layer and delimit state machine.
When the current access module of ONU was the GPON access module, the MAC layer was in the GEM(GPON of descending 2488Mbps encapsulation mode) work under the frame pattern, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984, operation GPON frame is delimited state machine; When the current access module of ONU was the EPON access module, the MAC layer was worked under the ethernet frame pattern of descending 1250Mbps, was operated in the MAC layer of EPON pattern according to the technical standard of IEEE802.3ah, and operation EPON frame is delimited state machine.
S6: the detection duration parameters is set, that detects that duration parameters can be according to concrete engineering opens the environment setting, also can be according to OLT(Optical Line Terminal, optical line terminal) start-up time and fluorescent lifetime setting, can also default setting be default value, according to a large amount of experiments and working experience, default value is generally 3000 milliseconds.
S7: read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimit state machine by the frame of MAC layer operation and detect the downlink optical signal that ONU receives and whether reach frame synchronization state, if then the current access module of the current access module of mark ONU and OLT is consistent; Judgment frame is delimited state machine and is detected the downlink optical signal that ONU receives and whether reach the used time of frame synchronization state (hereinafter to be referred as the current detection time) above 1000 milliseconds, if, the detection duration parameters that sets in advance is replaced by the detection duration parameters of current detection time, otherwise the detection duration parameters that will set in advance is replaced by 1000 milliseconds.
The current detection time is not when surpassing 1000 milliseconds, the current detection time is less, need delimit state machine detection downlink optical signal for frame this moment and reach the frame synchronization state reservation regular hour, to guarantee that frame demarcation state machine can detect downlink optical signal and reach frame synchronization state in adequate time.
Forward step S10 to, otherwise the current access module of the current access module of mark ONU and OLT is inconsistent, forwards step S8 to.
In the GPON system, ITU-G.984 stipulates each GEM(GPON Encapsulation_Method, G-PON Encapsulation Mode) frame is 125 microseconds, finishes the frame bound search by synchronous (Psync) field of physics in the downlink frame structure, and the physics synchronization field is decided to be 0xB6AB31E0 approximately; In the EPON system, finish the frame bound search by specific preamble and the frame delimiter of 8 bytes, in IEEE802.3ah, be decided to be the sequence word string that 0x55 begins approximately.
In the detection time scope, when the downlink optical signal that ONU receives reached frame synchronization state, the current access module of ONU was consistent with the access module of OLT, did not need to change the access module of ONU; In the detection time scope, when the downlink optical signal that ONU receives did not reach frame synchronization state, the access module that ONU is current and the access module of OLT were inconsistent, needed to change the access module of ONU.When the current access module of the access module of OLT and ONU is inconsistent, according to the IEEE802.3ah technical standard of EPON and the ITU-G.984 standard of GPON, though ONU can receive downlink optical signal, the downlink optical signal that receives can not reach frame synchronization state.
S8: the access module that ONU is current and the access module of OLT are adaptive, and when the current access module of ONU was the GPON access module, ONU was according to EPON access module operate as normal; When the current access module of ONU is the EPON access module, the EPON access module is replaced by the GPON access module, ONU forwards step S9 to according to GPON access module operate as normal.
S9: the access module parameter that sets in advance is replaced by the current access module parameter of ONU; The current detection time is increased to more than 1.3 times, and the detection duration parameters after record increases forwards step S7 to.
After changing the current access module of ONU, according to the access module parameter after changing and the detection duration parameters after the increase, ONU after the access module replacing is detected again, consistent with the access module of OLT to determine the ONU after access module is changed, the operate as normal of assurance ONU and OLT.
S10: the detection duration parameters that will set in advance is replaced by the detection duration parameters of record.
When the current access module of the current access module of ONU and OLT was consistent, the detection duration parameters among the step S10 was the detection duration parameters of current detection time of recording among the step S7; When the current access module of the current access module of ONU and OLT was inconsistent, the detection duration parameters among the S10 was the detection duration parameters after increasing among the step S9.
S11: finish the detection of ONU and adaptive, the normal standby of ONU.
If the LOS signal of optical link occurs after elimination, then can't continue to detect and the access module of adaptive ONU and OLT, therefore, in the process of step S2 to S11, occur after elimination as if the LOS signal of optical link, then re-execute step S2.
Switch the access module of ONU if desired again, the detection duration parameters is set to the detection duration parameters among the step S10, detects detection duration parameters and access module parameter after duration parameters and access module parameter directly are set to be used to complete last time.
The operation principle of the inventive method is described below:
When the LOS signal of optical link was eliminated, ONU can receive descending downlink optical signal, and then is linked into the PON system, and ONU is linked into meeting and OLT(Optical Line Terminal, optical line terminal after the PON system) the generation association.In order to make ONU carry out normal professional transmitting-receiving, ONU need register at OLT, so that OLT management ONU, therefore, the access module of ONU need be consistent with the access module of OLT.When changing, the access module of OLT can produce the elimination of the LOS signal of optical link, when having only the LOS signal elimination of optical link, ONU just carries out the detection of access module, ONU is when work, whether the LOS signal that only needs to detect optical link is eliminated, whether the access module that ONU not only can detect OLT in real time changes, and lower to the occupancy of system, is difficult for influencing user's normal use.
If the LOS signal ONU of optical link eliminates in the process of electrifying startup, can predict that the current access module of the access module of OLT and ONU is inconsistent, after supposing the ONU electrifying startup, the access module of OLT can not change, and the access module of OLT can be predicted consistent with the access module that sets in advance.When the ONU operate as normal, the LOS signal of optical link is eliminated behind ONU plug optical fiber or replacing optical fiber, may be the deterioration of the light signal of the disconnected fibre of unexpected generation or optical link, and the access module of OLT does not change.Therefore, situation about eliminating according to the LOS signal of optical link arranges the access module of ONU and predicts the access module that ONU and OLT mate to greatest extent, not only can not omit the contingent change of access module, and can accelerate to detect the detection speed of ONU access module.
The present invention has recorded the detection duration parameters of current detection time, and the detection duration parameters of current detection time is set to the detection duration parameters of use next time.Because frame demarcation state machine detects downlink optical signal and reaches the time of frame synchronization less than the time that sets in advance, therefore the bigger detection duration parameters that will set in advance is replaced by current less detection duration parameters, can shorten and detect ONU access module required detection time next time, accelerate to detect the detection speed of the required access module of ONU next time.
Access module parameter after the present invention will change is as the used access module parameter of the access module that detects ONU next time, because the access module parameter after changing is the accurate parameter of the required access module of ONU, therefore the access module parameter that sets in advance is replaced by the access module parameter after the replacing, can further guarantee the accuracy of the access module parameter that sets in advance, shorten detection time next time.
When OLT broke down, the downlink optical signal that ONU receives can not reach frame synchronization state in detection time in the scope; Therefore, when downlink optical signal that ONU receives when do not reach frame synchronization state in the scope detection time, upgrade the detection duration parameters that sets in advance, its renewal process detects duration parameters for prolonging, and breaks down the time that the back repairs in order to reserve OLT.Draw through a large amount of experiment and experiences, the detection duration parameters that sets in advance is increased to more than 1.3 times, as the detection duration parameters after upgrading.Detect duration parameters and also can in concrete engineering-environment, learn, optimize, with adaptive concrete engineering-environment, further accelerate to detect the detection speed of the required access module of ONU.
What the embodiment of the invention provided detects the also device of the method for adaptive EPON, GPON automatically based on ONU, comprising:
Optical link signal judge module is used for: electrifying startup ONU, and electrifying startup ONU reads and moves the current access module parameter of ONU, and the access module parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge whether the LOS signal of optical link is eliminated, if ONU receives the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal; Otherwise detect the state of optical link again.
Optical link signal judge module comprises:
Access module arranges the unit, is used for: setting in advance the access module parameter at ONU is GPON pattern or EPON pattern;
The optical link signal is eliminated state detection unit, is used for:
Judge whether the LOS signal of optical link is eliminated in the process of ONU electrifying startup, if, the LOS signal of then determining optical link is to eliminate in the process of ONU electrifying startup, read the access module parameter that sets in advance, according to the access module parameter the current access module of ONU is set, delimits state machine operation module to frame and send working signal; Otherwise the LOS signal of determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal; Directly delimit state machine operation module to frame and send working signal;
The LOS signal of perhaps judging optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if, the LOS signal of then determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly delimits state machine operation module to frame and sends working signal; Otherwise the LOS signal of determining optical link is to eliminate to read the access module parameter that sets in advance in the process of ONU electrifying startup, according to the access module parameter the current access module of ONU is set, and delimits state machine operation module to frame and sends working signal.
Frame is delimited state machine operation module, be used for: after receiving the working signal of optical link signal judge module or access module handover module transmission, according to the current access module of ONU the framing mode of media access control layer is set, moves frame according to the framing mode of media access control layer and delimit state machine; Send working signal to the access module detection module.
The access module detection module is used for: after receiving the working signal of frame demarcation state machine operation module transmission, arrange and read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimit state machine detection downlink optical signal by the frame of media access control layer operation and whether reach frame synchronization state, if, then the current access module of the current access module of mark ONU and OLT is consistent, send working signal to ONU standby module, otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, sends working signal to the access module handover module;
The access module detection module comprises:
Detect the duration record cell, be used for: when the downlink optical signal that receives as ONU reaches frame synchronization state, judgment frame is delimited state machine and is detected the downlink optical signal that ONU receives and whether reach the used time of frame synchronization state above 1000 milliseconds, if, the detection duration parameters that arranges is replaced by frame delimits state machine and detect downlink optical signal that ONU the receives detection duration parameters of used time, otherwise the detection duration parameters that will arrange is replaced by 1000 milliseconds.
The access module handover module is used for: after receiving the working signal of access module detection module transmission, the record frame is delimited state machine and is detected the used time of downlink optical signal that ONU receives; Judgment frame is delimited state machine and is detected the downlink optical signal that ONU receives and whether reach the used time of frame synchronization state above 1000 milliseconds, if, the detection duration parameters that arranges is replaced by frame delimits state machine and detect downlink optical signal that ONU the receives detection duration parameters of used time, otherwise the detection duration parameters that will arrange is replaced by 1000 milliseconds.
The access module handover module comprises:
Detect the duration updating block, be used for: the access module parameter that sets in advance is replaced by the current access module parameter of ONU, the detection duration parameters that sets in advance is increased to more than 1.3 times.
ONU standby module is used for: after receiving the working signal that access module detection module or access module handover module send, finish the detection of ONU and adaptive, the normal standby of ONU.
Below, describe method of the present invention in detail by three embodiment.
Embodiment 1: using method of the present invention first, is that the ONU of GPON access module accesses to the EPON system with current access module.
Electrifying startup ONU reads and moves the GPON pattern, and setting in advance the access module parameter at ONU is the GPON pattern.Detect the state of optical link, the LOS signal of optical link is eliminated in the process of ONU electrifying startup.Read the GPON pattern, be set to the GPON access module according to the access module of GPON pattern ONU; Read the detection duration parameters, be set to 3000 milliseconds detection time according to detecting duration parameters.The framing mode of MAC layer is set according to the GPON access module, the MAC layer is worked under the GEM of descending 2488Mbps frame pattern, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984, operation GPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is 0xB6AB31E0.Setting in advance and detecting duration parameters is 3000 milliseconds, reads the detection duration parameters, in detection times of 3000 milliseconds in the scope, delimits state machine by the GPON frame of MAC layer operation and detects the downlink optical signal that ONU receives and whether reach frame synchronization state; Because OLT adopts the EPON access module, the operation of therefore adopting 125 delicate every GEM frame search frame heads to delimit can be in search condition always, and the downlink optical signal that ONU receives can not reach frame synchronization state.
The current access module of the access module that mark ONU is current and OLT is inconsistent, the access module of ONU is replaced by the EPON access module by the GPON access module, the detection duration parameters that renewal sets in advance, the detection duration parameters that sets in advance is increased to 4000 milliseconds, the access module parameter that sets in advance is replaced by the EPON pattern by the GPON pattern.Reset the framing mode of MAC layer according to the EPON access module, the MAC layer is worked under the ethernet frame pattern of descending 1250Mbps, be operated in the MAC layer of EPON pattern according to the technical standard of IEEE802.3ah, operation EPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is the 0x55 character string sequence.Read to set in advance and detect duration parameters (4000 milliseconds), in detection times of 4000 milliseconds in the scope, delimit state machine by the EPON frame of MAC layer operation and detect the downlink optical signal that ONU receives and whether reach frame synchronization state.
The ONU of employing EPON access module can be adaptive with the OLT that adopts the EPON access module, the MAC layer operates under the technical standard of IEEE802.3ah, because ONU is identical with the OLT access module, so the downlink optical signal that frame demarcation state machine can receive ONU rapidly is judged to be frame synchronization.The record current detection time because the current detection time be 2000 delicate, less than 1000 milliseconds of minimum detection duration parameters values, so the detection duration parameters that will set in advance is replaced by 1000 milliseconds of minimum detection duration parameters values.The normal standby of ONU, OLT local side are found ONU, are carried out workflows such as ONU registration.
Embodiment 2: on the basis of embodiment 1, the ONU of EPON access module is accessed to the GPON system.
Electrifying startup ONU reads and moves the EPON pattern, detects the state of optical link, and the LOS signal of optical link is eliminated in the process of ONU electrifying startup.Read the EPON pattern, be set to the EPON access module according to the access module of EPON pattern ONU.The framing mode of MAC layer is set according to the EPON access module, the MAC layer is worked under the ethernet frame pattern of descending 1250Mbps, be operated in the MAC layer of EPON pattern according to the technical standard of IEEE802.3ah, operation EPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is the 0x55 character string sequence.Read the detection duration parameters after changing among the embodiment 1, be set to 1000 milliseconds detection time according to detecting duration parameters, in detection times of 1000 milliseconds in the scope, delimit state machine by the EPON frame of MAC layer operation and detect the downlink optical signal that ONU receives and whether reach frame synchronization state; Because OLT adopts the GPON access module, the operation of therefore adopting 125 delicate every GEM frame search frame heads to delimit can be in search condition always, and the downlink optical signal that ONU receives can not reach frame synchronization state.
The current access module of the access module that mark ONU is current and OLT is inconsistent, the access module of ONU is replaced by the GPON access module by the EPON access module, the detection duration parameters that sets in advance is increased to 1300 milliseconds, the access module parameter that sets in advance is replaced by the GPON pattern by the EPON pattern.Reset the framing mode of MAC layer according to the GPON access module, the MAC layer is worked under the GEM of descending 2488Mbps frame pattern, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984, operation GPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is 0xB6AB31E0.Setting in advance and detecting duration parameters is 1300 milliseconds, reads the detection duration parameters, in detection times of 1300 milliseconds in the scope, delimits state machine by the GPON frame of MAC layer operation and detects the downlink optical signal that ONU receives and whether reach frame synchronization state.
The ONU of employing GPON access module can be adaptive with the OLT that adopts the GPON access module, the MAC layer operates under the technical standard of ITU-G.984, because ONU is identical with the OLT access module, so the downlink optical signal that frame demarcation state machine can receive ONU rapidly is judged to be frame synchronization.The record current detection time because the current detection time be 500 delicate, less than 1000 milliseconds of minimum detection duration parameters values, so the detection duration parameters that will set in advance is replaced by 1000 milliseconds of minimum detection duration parameters values.The normal standby of ONU, OLT local side are found ONU, are carried out workflows such as ONU registration.
Embodiment 3: on the basis of embodiment 2, the ONU of GPON access module is accessed to the GPON system.
Electrifying startup ONU reads and moves the GPON pattern, detects the state of optical link, at ONU plug optical fiber or after changing optical fiber, and the LOS signal elimination of optical link.The framing mode of MAC layer is set according to the GPON access module, the MAC layer is worked under the GEM of descending 2488Mbps frame pattern, be operated in the MAC layer of GPON pattern according to the technical standard of ITU-G.984, operation GPON frame is delimited state machine, and the synchronous characteristic string that frame demarcation state machine is set is 0xB6AB31E0.Read the detection duration parameters after upgrading among the embodiment 2, be set to 1000 milliseconds detection time according to detecting duration parameters; In detection times of 1000 milliseconds in the scope, delimit state machine by the GPON frame of MAC layer operation and detect the downlink optical signal that ONU receives and whether reach frame synchronization state; Because OLT adopts the GPON access module, therefore adopt 125 delicate every GEM frame search frame head demarcation can detect the downlink optical signal that ONU receives rapidly and reach frame synchronization state.In theory, because continuous 2 GEM frames are 250 delicate, therefore 125 delicate every GEM frame search frame heads are delimited only needs 1 millisecond can reach frame synchronization state and end mode detects.The record current detection time, the current detection time is 500 delicate, less than 1000 milliseconds of minimum detection duration parameters values, so the detection duration parameters that will set in advance is replaced by 1000 milliseconds of minimum detection duration parameters values.
The current access module of the current access module of mark ONU and OLT is consistent, does not need to change the current access module of ONU.The ONU of employing GPON access module can be adaptive with the OLT that adopts the GPON access module, the MAC layer operates under the technical standard of ITU-G.984, because ONU is identical with the OLT access module, so the downlink optical signal that frame demarcation state machine can receive ONU rapidly is judged to be frame synchronization.The normal standby of ONU, OLT local side are found ONU, are carried out workflows such as ONU registration.
The present invention is not limited to above-mentioned execution mode, for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, and these improvements and modifications also are considered as within protection scope of the present invention.The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.

Claims (10)

1. an ONU detects the also method of adaptive EPON, GPON automatically, it is characterized in that, may further comprise the steps:
A, electrifying startup ONU read and move the current access module parameter of ONU, and the access module parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge that the LOS signal of optical link is eliminated, ONU detects the downlink optical signal of OLT;
B, according to the current access module of ONU the framing mode of media access control layer is set, moves frame according to the framing mode of media access control layer and delimit state machine;
C, arrange and read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimit state machine detection downlink optical signal by described frame and whether reach frame synchronization state, if, then the current access module of the current access module of mark ONU and OLT is consistent, forward step e to, otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, forwards step D to;
D, the current access module of replacing ONU forward step B to;
E, finish the detection of ONU and adaptive, the normal standby of ONU.
2. ONU as claimed in claim 1 detects the also method of adaptive EPON, GPON automatically, it is characterized in that after the electrifying startup ONU, further comprising the steps of in the steps A: setting in advance the access module parameter at ONU is GPON pattern or EPON pattern.
3. ONU as claimed in claim 2 detects the also method of adaptive EPON, GPON automatically, it is characterized in that, step D is before forwarding step B to, comprise following flow process: the access module parameter that sets in advance is replaced by the current access module parameter of ONU, the detection duration parameters that sets in advance is increased to more than 1.3 times.
4. ONU as claimed in claim 2 detects the also method of adaptive EPON, GPON automatically, it is characterized in that, the step of judging the LOS signal elimination of optical link in the steps A comprises: whether the LOS signal of judging optical link is eliminated in the process of ONU electrifying startup, if, the LOS signal of then determining optical link is to eliminate in the process of ONU electrifying startup, read the access module parameter that sets in advance, according to the access module parameter the current access module of ONU is set, and forward step B to; Otherwise the LOS signal of determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly forwards step B to;
The LOS signal of perhaps judging optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if, the LOS signal of then determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly forwards step B to; Otherwise the LOS signal of determining optical link is to eliminate to read the access module parameter that sets in advance in the process of ONU electrifying startup, according to the access module parameter the current access module of ONU is set, and forwards step B to.
5. detect the also method of adaptive EPON, GPON automatically as each described ONU of claim 1 to 4, it is characterized in that steps A is further comprising the steps of: the LOS signal of judging optical link is not eliminated, and detects the state of optical link again.
6. detect the also method of adaptive EPON, GPON automatically as each described ONU of claim 1 to 4, it is characterized in that, step B comprises when the current access module of following flow process: ONU is the GPON access module, media access control layer is worked under the GPON of descending 2488Mbps pattern, media access control layer is according to the technical standard of ITU-G.984, and operation GPON frame is delimited state machine; When the current access module of ONU was the EPON access module, media access control layer was worked under the ethernet frame pattern of descending 1250Mbps, and media access control layer is according to the technical standard of IEEE802.3ah, and operation EPON frame is delimited state machine.
7. detect the also method of adaptive EPON, GPON automatically as each described ONU of claim 1 to 4, it is characterized in that, the downlink optical signal that receives as if ONU among the step C reaches frame synchronization state, then judgment frame is delimited state machine and is detected the downlink optical signal that ONU receives and whether reach the used time of frame synchronization state above 1000 milliseconds, if, the detection duration parameters that arranges is replaced by frame delimits state machine and detect downlink optical signal that ONU the receives detection duration parameters of used time, otherwise the detection duration parameters that will arrange is replaced by 1000 milliseconds.
8. detect the also method of adaptive EPON, GPON automatically as each described ONU of claim 1 to 4, it is characterized in that, change the current access module of ONU among the step D and comprise when the current access module of following flow process: ONU is the GPON access module, the GPON access module is replaced by the EPON access module; When the current access module of ONU is the EPON access module, the EPON access module is replaced by the GPON access module.
9. the device based on the method for the automatic detection of each described ONU of claim 1 to 8 and adaptive EPON, GPON is characterized in that, comprising:
Optical link signal judge module is used for: electrifying startup ONU, and electrifying startup ONU reads and moves the current access module parameter of ONU, and the access module parameter is GPON pattern or EPON pattern; Detect the state of optical link, judge whether the LOS signal of optical link is eliminated, if ONU receives the downlink optical signal of OLT, delimit state machine operation module to frame and send working signal; Otherwise detect the state of optical link again;
Frame is delimited state machine operation module, be used for: after receiving the working signal of optical link signal judge module or access module handover module transmission, according to the current access module of ONU the framing mode of media access control layer is set, moves frame according to the framing mode of media access control layer and delimit state machine; Send working signal to the access module detection module;
The access module detection module is used for: after receiving the working signal of frame demarcation state machine operation module transmission, arrange and read the detection duration parameters, according to detecting duration parameters be set detection time; In the detection time scope, delimiting state machine by the frame of media access control layer operation detects described downlink optical signal and whether reaches frame synchronization state, if, then the current access module of the current access module of mark ONU and OLT is consistent, send working signal to ONU standby module, otherwise the current access module of the access module that mark ONU is current and OLT is inconsistent, sends working signal to the access module handover module;
The access module handover module, be used for: after receiving the working signal of access module detection module transmission, the record frame is delimited state machine and is detected the used time of downlink optical signal that ONU receives, and the detection duration parameters that arranges is replaced by the record frame delimits state machine and detect downlink optical signal that ONU the receives duration parameters of used time; Delimit state machine operation module to frame and send working signal;
ONU standby module is used for: after receiving the working signal that access module detection module or access module handover module send, finish the detection of ONU and adaptive, the normal standby of ONU.
10. ONU as claimed in claim 9 detects the also device of the method for adaptive EPON, GPON automatically, it is characterized in that,
Described optical link signal judge module comprises:
Access module arranges the unit, is used for: setting in advance the access module parameter at ONU is GPON pattern or EPON pattern;
The optical link signal is eliminated state detection unit, is used for:
Judge whether the LOS signal of optical link is eliminated in the process of ONU electrifying startup, if, the LOS signal of then determining optical link is to eliminate in the process of ONU electrifying startup, read the access module parameter that sets in advance, according to the access module parameter the current access module of ONU is set, delimits state machine operation module to frame and send working signal; Otherwise the LOS signal of determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal; Directly delimit state machine operation module to frame and send working signal;
The LOS signal of perhaps judging optical link whether in the process of ONU operate as normal plug optical fiber or change optical fiber after eliminate, if, the LOS signal of then determining optical link is to eliminate after plugging optical fiber or change optical fiber in the process of ONU operate as normal, directly delimits state machine operation module to frame and sends working signal; Otherwise the LOS signal of determining optical link is to eliminate to read the access module parameter that sets in advance in the process of ONU electrifying startup, according to the access module parameter the current access module of ONU is set, and delimits state machine operation module to frame and sends working signal.
Described access module detection module comprises:
Detect the duration record cell, be used for: when the downlink optical signal that receives as ONU reaches frame synchronization state, judgment frame is delimited state machine and is detected the downlink optical signal that ONU receives and whether reach the used time of frame synchronization state above 1000 milliseconds, if, the detection duration parameters that arranges is replaced by frame delimits state machine and detect downlink optical signal that ONU the receives detection duration parameters of used time, otherwise the detection duration parameters that will arrange is replaced by 1000 milliseconds.
Described access module handover module comprises:
Detect the duration updating block, be used for: the access module parameter that sets in advance is replaced by the current access module parameter of ONU, the detection duration parameters that sets in advance is increased to more than 1.3 times.
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