CN100542072C - The method of testing of passive optical network fault - Google Patents
The method of testing of passive optical network fault Download PDFInfo
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- CN100542072C CN100542072C CNB2006100335496A CN200610033549A CN100542072C CN 100542072 C CN100542072 C CN 100542072C CN B2006100335496 A CNB2006100335496 A CN B2006100335496A CN 200610033549 A CN200610033549 A CN 200610033549A CN 100542072 C CN100542072 C CN 100542072C
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Abstract
A kind of method of testing of passive optical network fault and device are by 1) start optical line terminal test module and Optical Network Terminal test module respectively; 2) in N Optical Network Terminal side, select i Optical Network Terminal test module by the optical line terminal test module; 3) turn-off the up work light wave of i Optical Network Terminal by i Optical Network Terminal test module; Can 4) detect optical line terminal communicate by letter with all Optical Network Terminal beyond i the Optical Network Terminal with up work light wave; And 5) if all Optical Network Terminal beyond optical line terminal and i the Optical Network Terminal can communicate by letter, then measure this place's Optical Network Terminal fault, EOT, if can not and poll do not finish, then open the up work light wave of next each and every one Optical Network Terminal, get back to step 2) continue to detect up to end of polling(EOP).The beneficial effect of method of testing of the present invention and device is that test is all initiated by the optical line terminal test module, can realize automatically performing, and triggers automatically, and not influenced by the work reuse wavelengths, realizes row's barrier rapidly.
Description
Technical field
The present invention relates to passive optical network technique, more particularly, when relating to a kind of breaking down to the method for testing and the device of passive optical network fault.
Background technology
In the increasing broadband access network of scale, the most existing Local Area Network all operates on the network of 100Mbit/s, and many large-scale commercial companies are to gigabit Ethernet (GE) transition.And online at metro core net and metro edge, the SONET/SDH/GE bandwidth capacity is very abundant, and this makes Access Network partly produce serious bandwidth bottleneck.Compare with cable transmission, advantage such as Optical Fiber Transmission has that capacity is big, loss is little, anti-electromagnetic interference capability is strong, thereby, along with the cost of Optical Fiber Transmission progressively descends, the fiberize of the Access Network development trend that is inevitable.Representing access network segment of " last kilometer " part, Ultra Low Cost, simple structure are being arranged and be convenient to requirement such as realizations, realization has brought very big challenge to technology for this.Optical Access Network can be divided into two kinds of passive access and active accesses, EPON (PON) is a kind of access way of very attractive, its main feature is: low cost---significantly reduce the quantity of optical fiber, optical transceiver module, central office terminal, initial investment can be shared by a plurality of terminal uses; The overall optical transmission channel is optical fiber and Passive Optical Components, can effectively avoid electromagnetic interference and effects of lightning, has improved the reliability of system; Optical Distribution Network (ODN) module can hang over the roadside, need not remote power feeding and machine room, has reduced operation expense; Transparent to business, be convenient to system upgrade, management and introducing new business; Bandwidth is big, transmission range is long (can reach 20km).Therefore the access scheme based on EPON (PON) technology will become the one preferred technique that broadband light inserts.The transmission of EPON access service has with ATM to be the APON (ATM Based PONs) of transmission platform and to be the EPON (EthernetBased PONs) of transmission platform with the ethernet technology and to be three types of the GPON (Gigabit PONs) of transmission platform with the generic frame structure.
As shown in Figure 1, a typical passive optical network is made up of optical line terminal (OLT), Optical Network Terminal (ONT, or title ONU), Optical Distribution Network (ODN).OLT centre machine room, ONT is placed on user side.ODN comprises various Passive Optical Components such as optical fiber, splitter (splitter), and optical branching device is the passive fiber splitter, is an inactive component that connects optical line terminal and optical network unit, and its function is the distribution downlink data and concentrates upstream data.In a PON network, can pull out simple optical fiber to the broadband services subarea or the office garden from service exchange, and then isolate some branch roads on each building or business device from main fiber with passive optical splitter.This mode can make a plurality of users share the very expensive optical fiber link of this section from exchange to the user resident, thereby has also reduced Fiber-To-The-Building (FTTB) and the use cost that Fiber to the home (FTTH).
The descending employing broadcast mode transmission of PON, up employing time division multiple access (TDMA) mode is transmitted, and Fig. 2 is the up TDMA schematic diagram of PON, and each ONT upstream data timesharing is up, by the unified scheduling of OLT.
In actual application, particularly after terminal quantity increases, the terminal maintenance issues will be more and more outstanding, test to the PON light path is wherein than part and parcel, the existing information that the test and the test of terminal are based on employing OAM (oam) under the single wavelength is tested, when physical layer just often, can utilize this technology to carry out fault test and maintenance.In case physical layer breaks down, such as ONT optical module fault, to cause forcing long hair light, 100% takies the up path channels of PON, cause the upstream data of other ONU/ONT can't be up, comprise that maintenance association information all can't upload, cause all faults of all ONT, OLT interrupts to the path between all ONT, but also is inconvenient to locate the position of the ONT terminal that breaks down.Uplink figure when Fig. 3 breaks down for certain ONT, constant when luminous as certain ONT, data feedback channel is taken by 100%, and other ONT can not be communicated by letter with OLT.
Summary of the invention
The technical problem to be solved in the present invention is, at the defective of existing light network terminal test, provides a kind of method and apparatus that utilizes the test light wave that the test of light network terminal is provided.
The above-mentioned technical problem of the present invention solves like this, constructs a kind of method of testing of passive optical network fault, may further comprise the steps: S1) start optical line terminal test module and Optical Network Terminal test module respectively;
S2) by the optical line terminal test module by step S3)-S5) each Optical Network Terminal test module of poll;
S3) the Optical Network Terminal test module that is polled to is turn-offed its up work light wave;
S4) detect optical line terminal whether can with all Optical Network Terminal beyond the polled Optical Network Terminal with up work lightwave communication;
S5) if optical line terminal can be communicated by letter with all Optical Network Terminal beyond the current polled Optical Network Terminal, test out this place's Optical Network Terminal fault, EOT; Otherwise continue poll up to end of polling(EOP).
Testing apparatus according to a kind of passive optical network fault of the present invention is characterized in that, comprises optical line terminal test module and at least two Optical Network Terminal test modules that are positioned at the Optical Network Terminal side of being positioned at the optical line terminal side; Optical line terminal test module and Optical Network Terminal test module can be received and dispatched the test light wave optical signal, and by the test light wave optical signal, optical line terminal test module and Optical Network Terminal test module can communicate with one another.
In said apparatus of the present invention, be provided with communication port between optical line terminal test module and the optical line terminal equipment, start optical line terminal test module and Optical Network Terminal test module by optical line terminal equipment; Described optical line terminal test module is activated test back each Optical Network Terminal test module of poll; Be provided with communication port between described Optical Network Terminal test module and the optical network terminal, when the Optical Network Terminal test module is polled, can corresponding optical network terminal be controlled this Optical Network Terminal test module and is turn-offed its up work light wave, detect optical line terminal equipment by optical line terminal equipment simultaneously and communicate by letter with all optical network terminals beyond the polled Optical Network Terminal with up work light wave; If can communicate by letter, produce the test signal that there is fault in this place's optical network terminal.
In said apparatus of the present invention, optical line terminal test module and Optical Network Terminal test module be can independent test test module.
In said apparatus of the present invention, the Optical Network Terminal optical module is to receive the indication of Optical Network Terminal test module, turn-offs the optical module of up work light wave.
In said apparatus of the present invention, optical line terminal test module and at least two connect by optical fiber and optical branching device between the Optical Network Terminal test module of Optical Network Terminal side.
Implementing the method for testing of passive optical network fault provided by the invention and the beneficial effect of device is, because test is all initiated by the optical line terminal test module, can realize automatically performing, and triggers automatically, and not influenced by the work reuse wavelengths, realizes row's barrier rapidly.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the PON system schematic of prior art;
Fig. 2 is the up TDMA transmission principle of the PON of prior art figure;
Uplink figure when Fig. 3 is the ONT fault of prior art;
Fig. 4 is the overall structure schematic diagram of the first embodiment of the present invention;
Overall structure schematic diagram when Fig. 5 is the ONT fault of the first embodiment of the present invention;
Fig. 6 is the ONT of the first embodiment of the present invention up TDMA transmission diagram when removing fault;
Fig. 7 is the traffic diagram of the test macro of the first embodiment of the present invention.
Fig. 8 is another traffic diagram of the test macro of the first embodiment of the present invention.
Fig. 9 is the flow chart of the test macro of the first embodiment of the present invention.
Embodiment
Fig. 4 shows a preferred embodiment of the present invention, at first sets up a tree network, and it comprises optical line terminal side (OLT side), ODN, and N Optical Network Terminal side (ONT side).The OLT side comprises PON OLT optical module 2 and test module 1 (OLT tester), and each ONT side comprises PON ONT optical module 4 and test module 3 (OLT tester), and Optical Distribution Network (ODN) comprises optical fiber, 1:N splitter 5.Wherein, can set PON OLT optical module light emission wavelength is 1490nm, and the light-receiving wavelength is 1310nm, and PON ONT optical module light emission wavelength is 1310nm, and the light-receiving wavelength is 1490nm.Present embodiment is equally applicable to other wavelength as can be seen.
Setting up PON between OLT side and ONT side connects, at OLT side place by OLT test module 1 transmission test light wave, here setting the test light wave is Bnm, close ripple by a wave multiplexer with this wavelength with by the downlink working wavelength 1490nm wavelength of OLT emission, be sent to each ONT side by ODN by time division multiplexing, to test light wave Bnm in the processing of ONT side process partial wave separates, and input is positioned at the ONT test module of ONT side, this ONT test module can be received and dispatched the light signal of Bnm wavelength, downlink working wavelength 1490nm wavelength will enter ONT and handle, and so just realize the transmission of downlink data.
To close ripple by the up work light wave 1310nm and the test light wave Bnm of ONT emission at ONT side place then, and be uploaded to the OLT place, the place isolates the test light wave in the OLT side, gives OLT test module, up work light wave 1310nm is sent into the OLT business module handle.Finish transmission of uplink data.Test light wave Bnm is a fixed value, and is the same with operation wavelength, adopts time-division multiplex technology at down direction, and up direction is carried out the relevant access protocol of time division multiplexing.
The overall structure schematic diagram for convenience, had omitted downlink transmission direction when Fig. 5 showed the ONT fault of the first embodiment of the present invention.When ONT occurs constantly when luminous, OLT sends the instruction of turn-offing uplink service, and the OLT test module receives this instruction, passes to the ONT test module by the test light wave, allows ONT receive this instruction then, turn-offs the up work light wave of this ONT.And the up work light wave of remaining ONT is all opened, and can detection other ONT this moment communicate by letter with OLT, if other ONT still can not communicate by letter with OLT, illustrates that the ONT of this place does not have fault.
Open the up luminous of this ONT, allow other ONT of OLT poll, turn-off the up work light wave of ONT one by one, when find OLT can with all ONT proper communications except that turn-offing up work light wave, ONT fault herein is described, information by test light wave this moment can test out the position of the ONT that breaks down at OLT test module place, and get rid of the fault of uplink.
Fig. 6 is the ONT of the first embodiment of the present invention up TDMA transmission diagram when removing fault, and except the ONT that breaks down, other ONT can both communicate by letter with OLT.
Fig. 7 is the traffic diagram of the test macro of the first embodiment of the present invention.
OLT test module and ONT test module can both be received and dispatched the light signal of Bnm wavelength, communicate with one another by this light wave messaging as the independent test device.
Fig. 8 is another traffic diagram of the test macro of the first embodiment of the present invention.
The OLT test module also can be unified to communicate by letter with the ONT test module after the scheduling controlling by OLT equipment again, and the ONT test module also can be unified to communicate by letter with the OLT test module after the scheduling controlling by the ONT terminal again.
And the indication of ONT terminal equipment energy acceptance test module, turn-off up work light wave, fix a breakdown.
Fig. 9 is the flow chart of the test macro of the first embodiment of the present invention:
Flow chart is resolved as follows:
The 1st step started the OLT test module at OLT side place and the ONT test module of ONT side respectively, launched the test light wave by the OLT test module;
In the 2nd step, communicate by letter i ONT side of selection in N ONT side of poll with the OLT test module by the test light wave by the ONT test module at ONT side place;
In the 3rd step, i the ONT test module that is positioned at i ONT side receives the instruction of OLT test module, and i ONT passed in this instruction, and i ONT receives this instruction, turn-offs the up work light wave of i ONT;
In the 4th step, detect OLT and whether can communicate by letter with all ONT beyond i the Optical Network Terminal;
The 5th step, if OLT can communicate by letter with all ONT beyond i the Optical Network Terminal, the ONT of this place fault is described, test out this place's Optical Network Terminal fault, because turn-offed the ONT of fault, got rid of the fault of the uplink of whole PON simultaneously, EOT, if can not and i＜=N, open the up work light wave of i Optical Network Terminal, get back to the 2nd step and i=i+1.
Can find out that by flow chart test is all initiated by the optical line terminal test module, can realize automatically performing, trigger automatically, and not influenced by the work reuse wavelengths, realize row's barrier rapidly.
The wavelength of existing PON technology down going channel is 1490nm, and up wavelength is 1310nm, if carrying CATV, descending also will have an another one wavelength 1550nm; Being appreciated that only need increase the up-downgoing wavelength Cnm of a symmetry this moment again, is different from above-mentioned wavelength Bnm, and this wavelength Cnm will be mainly used to test.
Equally, be appreciated that this embodiment not only is confined to the number of increasable wavelength, also be not subjected to the influence of work reuse wavelengths, so the present invention should not be limited to disclosed specific embodiment, but the present invention will comprise all embodiment in the claim.
Claims (1)
1, a kind of method of testing of passive optical network fault is characterized in that, may further comprise the steps:
S1) start optical line terminal test module and Optical Network Terminal test module respectively;
S2) by the optical line terminal test module by step S3)-S5) each Optical Network Terminal test module of poll;
S3) the Optical Network Terminal test module that is polled to is turn-offed its up work light wave;
S4) detect optical line terminal whether can with all Optical Network Terminal beyond the polled Optical Network Terminal with up work lightwave communication;
S5) if optical line terminal can be communicated by letter with all Optical Network Terminal beyond the current polled Optical Network Terminal, test out this place's Optical Network Terminal fault, EOT; Otherwise continue poll up to end of polling(EOP).
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| CNB2006100335496A CN100542072C (en) | 2006-02-08 | 2006-02-08 | The method of testing of passive optical network fault |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101110648B (en) * | 2006-07-18 | 2010-11-24 | 华为技术有限公司 | Method for detecting faulted ONU in PON |
| CN101232328B (en) * | 2007-01-26 | 2011-09-14 | 华为技术有限公司 | Method for locating case point of branch optical fiber, optical network and network appliance |
| EP2034635B1 (en) | 2007-01-26 | 2012-08-15 | Huawei Technologies Co., Ltd. | A method for locating fiber event point and an optical network and network equipment thereof |
| CN101291176B (en) * | 2007-04-18 | 2012-07-04 | 华为技术有限公司 | Fault detection method, system and apparatus for optical distributed network |
| US9118433B2 (en) * | 2007-05-07 | 2015-08-25 | Alcatel Lucent | GPON OAM using IEEE 802.1ag methodology |
| CN101345581B (en) * | 2007-07-13 | 2011-07-20 | 华为技术有限公司 | Fault location method and system for passive optical network |
| CN102148682B (en) * | 2010-02-08 | 2016-02-10 | 中兴通讯股份有限公司 | A kind of method and system that the abnormal optical network unit of luminescence is correctly located |
| CN102291270B (en) * | 2010-06-21 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of management method of optical network unit in passive optical network and system |
| CN102006118B (en) * | 2010-12-01 | 2013-05-01 | 烽火通信科技股份有限公司 | Method for isolating long-emitting optical network units (ONU) in gigabit passive optical network (GPON) |
| CN102752041B (en) * | 2012-06-06 | 2015-04-08 | 烽火通信科技股份有限公司 | Method for detecting frequent-light-emission optical network units (ONUs) in gigabit passive optical network (GPON) system |
| CN105306135B (en) * | 2014-07-16 | 2018-03-23 | 中兴通讯股份有限公司 | Link polling detection method and device |
| CN106685522B (en) * | 2017-01-24 | 2019-03-12 | 东南大学 | A kind of network monitoring method and device based on poll Self Matching |
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| CN1592158A (en) * | 2003-08-26 | 2005-03-09 | 上海博为光电科技有限公司 | Asynchronous delay regulating method for passive optical fiber network |
| CN1665173A (en) * | 2004-03-03 | 2005-09-07 | 华为技术有限公司 | Optical fibre fault monitoring and positioning system for communication network and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592158A (en) * | 2003-08-26 | 2005-03-09 | 上海博为光电科技有限公司 | Asynchronous delay regulating method for passive optical fiber network |
| CN1665173A (en) * | 2004-03-03 | 2005-09-07 | 华为技术有限公司 | Optical fibre fault monitoring and positioning system for communication network and method thereof |
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