CN103532788B - EPON terminal use flow detection device - Google Patents
EPON terminal use flow detection device Download PDFInfo
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- CN103532788B CN103532788B CN201310511305.4A CN201310511305A CN103532788B CN 103532788 B CN103532788 B CN 103532788B CN 201310511305 A CN201310511305 A CN 201310511305A CN 103532788 B CN103532788 B CN 103532788B
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Abstract
The present invention relates to a kind of EPON terminal use flow detection device, formed by data capture unit, data processing unit two parts; Data capture unit adopts Passive Optical Components to realize, and Passive Optical Components is made up of the optical splitter of two one-to-two, and the splitting ratio of one of them optical splitter is 1:99, and another optical splitter splitting ratio is 35:65, and 99% optical branch and 65% optical branch are welded together; Data capture unit is combined by the optical splitter of two one-to-two, and the optical branch of 99% optical branch of one of them optical splitter and another optical splitter 65% is welded together; Does data capture unit have A, B, C, D? 4 SC optical fiber interfaces, beneficial effect is: by using this equipment, handled EPON terminal use data are obtained and resolved, can facilitate the handled total data information of relevant departments' Real Time Observation terminal use in the network of EPON system, in the time there are abnormal conditions, can take appropriate measures, avoid the generation of network safety event.
Description
Technical field
The present invention relates to network communications technology field, particularly a kind of EPON terminal use flow detection device.
Background technology
EPON (EPON) is the Main Means of realizing Fiber to the home network. EPON network organizing and data have its spySome agreements and frame format, the common equipment detecting for Ethernet data, None-identified EPON network data, for correct knowledgeOther EPON network data, the information security of maintaining network transmission, therefore needs to design a kind of EPON terminal use flow detection and establishesStandby, be used for realizing EPON Data Analysis and be packaged into Ethernet data. Make up the deficiency of alumnus's technology.
Summary of the invention
Object of the present invention, exactly for overcoming the deficiencies in the prior art, for an EPON terminal use flow detection difficult problem, is carriedFor a kind of EPON terminal use flow detection device, this equipment is mainly used for EPON (EPON) terminal use(ONU) checkout equipment of data traffic. Adopt a series connection point letter mode to obtain signal, all packets on collection network circuit alsoCarry out protocal analysis, data message is reduced, and analyze the flesh and blood of transmission. Network data analysis is single in enterprises and institutionsPosition and associated safety field have a wide range of applications, to realize network traffic recording and analysis, network event record etc.
The present invention realizes by such technical scheme: EPON terminal use flow detection device, is characterized in that
Formed by data capture unit, data processing unit two parts;
Described data capture unit adopts Passive Optical Components to realize, and Passive Optical Components is by the optical splitter group of two one-to-twoBecome, the splitting ratio of one of them optical splitter is 1:99, and another optical splitter splitting ratio is 35:65,99% optical branch and 65%Optical branch is welded together.
For the optical splitter of 1:99, the insertion loss of its input interface to 1% point support interface is 20dB, to 99% point of support interfaceInsertion loss be 0.2dB. For the optical splitter of 35:65, the insertion loss of its input interface to 35% point support interface is 4.5dB,Be 2dB to the insertion loss of 65% point of support interface.
Data capture unit is combined by the optical splitter of two one-to-two, by 99% optical branch of one of them optical splitterBe welded together with the optical branch of another optical splitter 65%. Data capture unit has A, B, C, a D4 SC optical fiber connectsMouthful. For EPON system descending data, signal is inputted by A mouth, and the signal of C mouth output is the downstream signal that equipment obtains, and insertsEntering loss is 20dB, and the signal of B mouth output is in order to complete former EPON line signal transmission. For EPON system uplink data, letterNumber inputted by B mouth, D mouth output signal is the upward signal that equipment obtains, and insertion loss is 4.5dB, and A mouth output signal is usedTo complete former EPON line signal transmission. The signal of C interface and D interface output is delivered to Back end data processing unit and is processed.
Described data processing unit is connected with fpga chip by photoelectric conversion module, sudden-occured mode digit-restoring special chipForm, signal acquiring unit is sent the optical signal obtaining into photoelectric conversion module, receives burst mode data after changing into the signal of telecommunicationRecover chip, bursty data recovered and carry out reduction of speed processing, output 10bit parallel data send into FPGA carry out protocol analysis withConversion. Optical module adopts OLT optical module and the ONU optical module of Wuhan telecommunications devices (WTD), and special chip adopts Texas Instrument(TI) TLK1211, fpga chip adopts the XC6VLX130T of Sai Lingsi (XILINX);
Data processing unit adopts respectively OLT optical module and ONU optical module to carry out the reception of data, realizes the light of dataElectricity conversion. Adopt the special chip TLK1211 of TI to complete the recovery of upstream data; Downlink data adopts the Serdes of FPGA to comeCarry out clock and data recovery, FPGA receives inside that first the upstream data of EPON and downlink data carry out the decryption oprerations of data,FPGA resolves for upstream data, obtains the key that data encryption adopts, then according to the numbering of key, to accordinglyDownlink data is decrypted, and the downlink data after deciphering carries out protocol conversion operation together with upstream data, generates ether netting indexAccording to frame format, then by the Serdes interface output of FPGA.
Beneficial effect is: by using EPON terminal use flow detection device by handled EPON terminal use dataObtain and resolve, can facilitate relevant departments' Real Time Observation terminal use in the network of EPON system handled allData message takes appropriate measures in the time there are abnormal conditions, avoids the generation of network safety event.
Brief description of the drawings
Fig. 1, EPON system data transmission schematic diagram;
Fig. 2, EPON data capture unit connected mode schematic diagram
Fig. 3, data capture unit schematic diagram;
Fig. 4, ethernet frame and EPON frame comparison diagram;
Fig. 5, data processing unit process chart;
Fig. 6, data resolution module process chart;
Fig. 7, data capture unit hardware configuration connect block diagram;
Fig. 8, data processing unit hardware configuration connect block diagram.
Detailed description of the invention
For a more clear understanding of the present invention, describe in conjunction with the accompanying drawings and embodiments the present invention in detail
EPON terminal use flow detection device, is made up of data capture unit, data processing unit two parts;
Be illustrated in figure 7 data capture unit hardware configuration and connect block diagram, data capture unit adopts Passive Optical Components realExisting, Passive Optical Components is made up of the optical splitter of two one-to-two, and the splitting ratio of one of them optical splitter is 1:99, another light splittingDevice splitting ratio is 35:65, and 99% optical branch and 65% optical branch are welded together.
Be illustrated in figure 8 data processing unit hardware configuration and connect block diagram, data processing unit data processing unit is by lightElectricity modular converter, sudden-occured mode digit-restoring special chip and fpga chip connect and compose, and signal acquiring unit is by the light obtainingSignal is sent into photoelectric conversion module, receives sudden-occured mode digit-restoring chip after changing into the signal of telecommunication, and bursty data is recovered to go forward side by sideThe processing of row reduction of speed, output 10bit parallel data is sent into FPGA and is carried out protocol analysis and conversion. Optical module adopts Wuhan telecommunications devices(WTD) OLT optical module and ONU optical module, special chip adopts the TLK1211 of Texas Instrument (TI), and fpga chip adopts matchThe XC6VLX130T of spirit this (XILINX);
The present invention is for the checkout equipment to EPON (EPON) terminal use (ONU) data traffic.
The mode that adopts series winding to win the confidence is obtained signal, and all packets on collection network circuit also carry out protocal analysis,Data message is reduced, and analyze the flesh and blood of transmission. Network data analysis is in enterprises and institutions and associated safetyField has a wide range of applications, to realize network traffic recording and analysis, network event record and to intercept Data Communication in Computer Networks. AsModern Access Network is progressively to broadband, synthesization, diversification and fiberize development, and the final developing goal of access in radio is to realize lightFine to family (FTTH), so that unified Integrated Service Access Platform to be provided. The means of the current FTTH of realization have two kinds of EPON and GPONMode, EPON terminal use flow detection device is for the checkout equipment to EPON network user's deal with data.
Adopt EPON terminal use flow detection device can obtain the handled all data of terminal use (ONU), withBe convenient to the operation such as analysis, processing of rear end equipment to network data.
Philosophy and technique is realized:
EPON terminal use flow detection device is made up of two parts, and first, data capture unit. The second, data processingUnit.
Data capture unit adopts Passive Optical Components to realize.
EPON system adopts single fiber bi-directional mode to transmit data, as shown in Figure 1. Sent to by terminal OLT deviceThe data of user side ONU equipment are downlink data, for the forms of broadcasting are carried by 1490nm light, are sent by user side ONU equipmentBe upstream data to the data of terminal OLT device, for burst form is carried by 1310nm light.
As shown in Figure 2, on simple optical fiber, obtain the signal of both direction, not affect again the communication of legacy network, canAdopt two optical splitters to integrate, and calculate the splitting ratio of optical splitter, to meet former EPON circuit transmission demand and EPONTerminal use's data-detection apparatus is to accepting the demand of luminous power.
For downlink data, OLT equipment luminous power is for being less than or equal to 2dBm, and the insertion through 4dB in transmitting procedure is damagedConsumption, is be less than or equal to-2dBm when arriving signal acquiring unit, and ONU received optical power is be more than or equal to-26dBm, considers optical linkLoss 1dB, ODN spectrophotometric unit insertion loss 20dB, signal acquiring unit output downlink data luminous power requires to be greater than etc.In-5dBm.
For upstream data, ONU equipment luminous power is for being less than or equal to 0dBm, and the insertion through 1dB in transmitting procedure is damagedConsumption, ODN spectrophotometric unit insertion loss 20dB, is be less than or equal to-21dBm when arriving signal acquiring unit, OLT received optical power isBe more than or equal to-30dBm, consider optical link loss 4dB, signal acquiring unit output upstream data luminous power requires to be greater than etc.In-26dBm.
The upstream data received optical power of simultaneously considering EPON terminal use flow detection device is be more than or equal to-30dBm,Downlink data received optical power is be more than or equal to-26dBm. The distribution of signal acquiring unit to splitting ratio as shown in Figure 3.
A mouth connects OLT mono-optical fiber, and B mouth connects ODN mono-optical fiber, introduces the insertion damage that is less than 3dB in former EPON circuitConsumption, C mouth output downlink data, light splitting 1% obtain-22dBm meets be more than or equal to-26dBm. D mouth output upstream data, light splitting 35%Obtain-26dBm meets be more than or equal to-30dBm.
The realization of data processing unit:
The standard that EPON transfer of data system is followed is IEEE802.3ah, is to have done on the basis of ethernet frame structureSome expansions are carried EPON data message with this. EPON system data transmission mechanism feature is as follows:
1, downstream data flow adopts broadcast technology;
2, upstream adopts TDMA technology, is bursty data pattern;
3, transmission line speed is descending/up: 1250Mbit/s/1250Mbit/s;
4, downlink data transmission does the encryption process;
5, determine whether to add FEC coding depending on transmission range;
As shown in Figure 4, EPON Frame has done following expansion on the basis of ethernet frame structure.
1, Flag position (bit1): stir mark, represent whether this frame is stirred, wherein; 0: expressly; 1: ciphertext.
2, Key_Index position (bit0): cipher key index, the key that instruction ONU will adopt in solution agitation is compiledNumber.
When stirring function is closed, the value of Key_Index position should be " 1 ".
Data processing unit has been combined by optical module, special chip and FPGA, and handling process is as Fig. 5.
Processing for EPON upstream data:
EPON upstream data and downlink data adopt dedicated optical module to carry out the reception of data, and the photoelectricity of realizing data turnsChange. In EPON system, upward signal is burst mode, and data are from different nodes, and the time delay of process is not identical with decay,Cause the difference of outburst mode optical signal and traditional optical signal. Between the time slot that different ONU send, there are SPA sudden phase anomalies. Therefore,OLT must realize the synchronous of phase place in cell arrives the very short time (in several bits), and then receives data. Here adoptComplete the recovery of burst mode data with the special chip TLK1211 of TI.
Data resolution module is completed by fpga chip. Handling process is as Fig. 6.
The GPIO that the 10bit parallel data of TLK1211 output is sent to FPGA does the decoding of 8B/10B, and downlink data can be straightPick and in FPGASerDes, do clock and data recovery and do 8B/10B decoding simultaneously, (comprise up to decoded 8bit dataWith descending data) judge whether to have added FEC coding, EPON system is supported two-way forward error correction (FEC) function,Demand depending on transmission range can be configured to by management frames the data interpolation FEC coding of transmission, as has added FEC coding and carried outSeparate FEC operation, separate FEC and complete and data are delivered to next module do frame alignment.
EPON system descending adopts the forms of broadcasting, in order to solve the safety problem existing in network, to sending to each ONUDownlink data be encrypted transmission. First complete the mutual of key by the initialization of key, in addition OLT periodically toLower broadcast transmission key request frame, key is passed to OLT equipment by up management frame data, more after new key by the key with newComplete the encryption of downlink data. For the mutual and renewal of key, device decrypts module must correctly be extracted key accurateThe numbering of identification key complete the deciphering of downlink data. First judge Frame or for key for upward signalMutual management frames, if Frame is directly delivered to next processing module, if the management frames of cipher key interaction, Cong ZhongquGo out key, key is given to the deciphering module of downstream signal, downstream signal is decrypted.
After Data Analysis completes, the lead code of Frame is reduced into the form of ethernet mac frame preamble code, passes through FPGASerdes interface send to the special chip 88E1111 of physical layer to process Ethernet data, then through network becomeAfter depressor isolation with RJ45 electrical interface formal output.
According to the above description, can realize the solution of the present invention in conjunction with art technology.
Claims (1)
1. an EPON terminal use flow detection device, is characterized in that, by two of data capture unit, data processing unitsBe grouped into;
Described data capture unit adopts Passive Optical Components to realize, and Passive Optical Components is made up of the optical splitter of two one-to-two, itsIn the splitting ratio of an optical splitter be 1:99, another optical splitter splitting ratio is 35:65,99% optical branch and 65% optical branchBe welded together;
For the optical splitter of 1:99, the insertion loss of its input interface to 1% point support interface is 20dB, to inserting of 99% point of support interfaceEntering loss is 0.2dB; For the optical splitter of 35:65, the insertion loss of its input interface to 35% point support interface is 4.5dB, arrivesThe insertion loss of 65% point of support interface is 2dB;
Data capture unit is made up of Passive Optical Components; Data capture unit has A, B, C, a D4 SC optical fiber interface; ForEPON system descending data, signal is inputted by A mouth, and the signal of C mouth output is the downstream signal that equipment obtains, and insertion loss is20dB, the signal of B mouth output is in order to complete former EPON line signal transmission; For EPON system uplink data, signal is by B mouthInput, D mouth output signal is the upward signal that equipment obtains, and insertion loss is 4.5dB, and A mouth output signal is former in order to completeThe transmission of EPON line signal; The signal of C interface and D interface output is delivered to Back end data processing unit and is processed;
Described data processing unit is connected structure by photoelectric conversion module, sudden-occured mode digit-restoring special chip with fpga chipBecome, signal acquiring unit is sent the optical signal obtaining into photoelectric conversion module, changes into that to receive burst mode data after the signal of telecommunication extensiveMultiple chip, recovers bursty data and carries out reduction of speed processing, and output 10bit parallel data is sent into FPGA and carried out protocol analysis and turnChange; Optical module adopts OLT optical module and the ONU optical module of Wuhan telecommunications devices (WTD), and special chip adopts Texas Instrument(TI) TLK1211, fpga chip adopts the XC6VLX130T of Sai Lingsi (XILINX);
Data processing unit adopts respectively OLT optical module and ONU optical module to carry out the reception of data, and the photoelectricity of realizing data turnsChange; Adopt the special chip TLK1211 of TI to complete the recovery of upstream data; Downlink data adopts the Serdes of FPGA to carry outClock and data recovery, FPGA receives inside that first the upstream data of EPON and downlink data carry out the decryption oprerations of data, FPGAResolve for upstream data, obtain the key that data encryption adopts, then according to the numbering of key, to descending accordinglyData are decrypted, and the downlink data after deciphering carries out protocol conversion operation together with upstream data, generate ethernet data frameForm, then by the Serdes interface output of FPGA.
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| CN104469558A (en) * | 2014-11-14 | 2015-03-25 | 上海欣诺通信技术有限公司 | EPON link data collecting and analyzing device and method |
| CN105138070B (en) * | 2015-09-25 | 2017-12-08 | 烽火通信科技股份有限公司 | Clock circuit for FPGA verification platforms |
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| EP1746857A1 (en) * | 2005-07-20 | 2007-01-24 | Siemens Aktiengesellschaft | Method and apparatus enabling end-to-end resilience in PONs |
| CN101047442A (en) * | 2006-04-02 | 2007-10-03 | 华为技术有限公司 | Maintenance method of passive optical network and its system |
| CN102684810A (en) * | 2012-01-18 | 2012-09-19 | 徐志国 | Optical network protection method, optical link switching control device and optical link switching control system |
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| US8442398B2 (en) * | 2008-10-21 | 2013-05-14 | Broadcom Corporation | Performance monitoring in passive optical networks |
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| EP1746857A1 (en) * | 2005-07-20 | 2007-01-24 | Siemens Aktiengesellschaft | Method and apparatus enabling end-to-end resilience in PONs |
| CN101047442A (en) * | 2006-04-02 | 2007-10-03 | 华为技术有限公司 | Maintenance method of passive optical network and its system |
| CN102684810A (en) * | 2012-01-18 | 2012-09-19 | 徐志国 | Optical network protection method, optical link switching control device and optical link switching control system |
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