CN101039147A - System and method for protecting passive optical network - Google Patents
System and method for protecting passive optical network Download PDFInfo
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- CN101039147A CN101039147A CNA2007100873671A CN200710087367A CN101039147A CN 101039147 A CN101039147 A CN 101039147A CN A2007100873671 A CNA2007100873671 A CN A2007100873671A CN 200710087367 A CN200710087367 A CN 200710087367A CN 101039147 A CN101039147 A CN 101039147A
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- 238000011144 upstream manufacturing Methods 0.000 claims description 22
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2581—Multimode transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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Abstract
The present invention discloses an optical passive network protecting system and method. The system comprises a luminescence detection unit, which is used to detect the optical transmitter radiation power of the terminal device in the optical passive network; A protection control unit, which is used to judge weather the terminal device goes wrong according to the detecting result of the luminescence detection unit in a reservation time after the terminal device starts or ends sending uplink data, and direct the luminescence control unit to close the optical transmitter of the terminal device once the terminal device goes wrong; A luminescence control unit which is used to close the optical transmitter of the terminal device and isolate the terminal device with the optical passive network. The time that the optical passive network takes to recover from the constant luminescence classified fault can be greatly shortened via the invention, thus the robustness and reliability can be improved.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of EPON protection system and method.
Background technology
EPON (Passive Optical Network is called for short PON) technology is a kind of emerging broadband light access network technology.PON is the one-to-many structure on physical topology, then is structure one to one in logic.Its downlink data is transmitted as broadcast mode, all PON terminal equipments, and promptly optical network unit (Optical Network Unit is called for short ONU) can both receive all downlink data frames on its physics PON mouth.Up then is time division multiple access (Time Division Multiple Access, be called for short TDMA) mode, each ONU is only at the PON local side apparatus, and promptly optical line terminal (Optical Line Terminal is called for short OLT) is the interior upstream data that sends of uplink authorization time slot of its distribution.
Owing to adopted up TDMA access technology, serious safety problem of PON network faces.If there is an ONU ceaselessly to send uplink optical signal because of breaking down, the normal data that every other ONU is sent can't be resumed out at the OLT place, also just can't successfully be registered on the OLT, this means the collapse of PON network.Although it is little to occur the probability of such fault in the practical application, in case so normal failure light emission occurs, consequence is very serious and be difficult to locate the position of breaking down.Can only locate the ONU that breaks down by power supply of closing ONU successively or the method for pulling out ONU optical fiber at present, and then change this ONU.Yet in the practical operation, this method exists very big shortcoming: generally, each ONU that OLT hangs down geographically relatively disperses mostly, and is also distant with the distance of OLT.When a lot of ONU (as 32 or 64), it is pretty troublesome to operate, and wastes time and energy.
Normal failure light emission having taken place oneself and taken measures to stop luminous if ONU can detect automatically, will shorten the time of disturbing other ONU when breaking down greatly, and then has shortened failure recovery time.Yet, up to the present, also do not see the report of correlation technique and device.
Summary of the invention
In view of the above problems; the present invention proposes a kind of normal failure light emission protection system and method that is used for passive optical network terminal; with the interference of the terminal equipment avoiding breaking down to the other-end equipment in the PON network; and then shorten the recovery time of PON when such fault occurring greatly, improve the robustness and the reliability of PON network.
EPON protection system according to the present invention comprises: the luminous detection unit is used to detect the emission luminous power of optical sender of the terminal equipment of EPON; The protection control unit, be used in the scheduled time after terminal equipment begins or finish to send upstream data, judge according to the testing result of luminous detection unit whether terminal equipment fault has taken place, and under situation about breaking down, the close a terminal optical sender of equipment of indication luminous controling unit; And luminous controling unit, the optical sender that is used to the equipment of closing a terminal is to isolate terminal equipment and EPON.
Wherein, the protection control unit comprises: timer units is used for startup transmission beginning timer when terminal equipment begins to send upstream data, and starts transmission stop timing device when finishing the transmission upstream data; The fault judgement unit, be used for sending the beginning timer or sending under the overtime situation of stop timing device, judge according to the testing result of luminous detection unit whether terminal equipment fault has taken place, wherein, detect under the situation of emission luminous power less than predetermined threshold in the luminous detection unit, fault judgement unit judges terminal equipment does not break down, and detects under the situation of emission luminous power greater than predetermined threshold in the luminous detection unit, and fault has taken place fault judgement unit judges terminal equipment.
Wherein, the luminous detection unit comprises: receiving element is used for the light signal that receiving terminal apparatus sends; And comparing unit, be used for the emission luminous power and the predetermined threshold of the optical sender of terminal equipment are compared.
Wherein, send the maximum possible transmission data time of the fixed time interval of beginning timer greater than terminal equipment.Send the pass response time of the fixed time interval of stop timing device greater than the optical sender of terminal equipment.The protection control unit links to each other with luminous controling unit with the luminous detection unit by holding wire.Luminous controling unit is a switch, and the one end links to each other with the power pin of the optical sender of terminal equipment, and the other end links to each other with DC power supply.
Passive optical network protecting method according to the present invention may further comprise the steps: S402, and the luminous detection unit detects the emission luminous power of the optical sender of terminal equipment; S404, the protection control unit judges according to the testing result of luminous detection unit whether terminal equipment fault has taken place in the scheduled time after terminal equipment begins or finish to send upstream data; And S406, when the protection control unit is judged terminal equipment and is broken down, the close a terminal optical sender of equipment of luminous controling unit, thereby with terminal equipment and EPON isolation.
Wherein, in step S402, the luminous detection unit compares the emission luminous power and the predetermined threshold of the optical sender of terminal equipment.
Wherein, step S404 may further comprise the steps: S4042, protection control unit start transmission beginning timer when terminal equipment begins to send upstream data, and start transmission stop timing device when terminal equipment finishes to send upstream data; S4044, send the beginning timer or sending the stop timing device when overtime, the protection control unit judges according to the testing result of luminous detection unit whether terminal equipment fault has taken place, wherein, when detecting the emission luminous power less than predetermined threshold in the luminous detection unit, the protection control unit judges that terminal equipment does not break down; Detect under the situation of emission luminous power greater than predetermined threshold in the luminous detection unit, the protection control unit judges that fault has taken place terminal equipment.
Wherein, send the maximum possible transmission data time of the fixed time interval of beginning timer greater than terminal equipment.Send the pass response time of the fixed time interval of stop timing device greater than the optical sender of terminal equipment.
By the present invention, make and automatically to detect normal failure light emission at the passive optical network terminal place, and can when breaking down, close optical sender automatically, thereby can avoid interference to other-end equipment, and then shortened the recovery time of EPON when such fault occurring greatly, improved the robustness and the reliability of EPON.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the topological diagram of PON system related to the present invention;
Fig. 2 is the block diagram of EPON protection system of the present invention;
Fig. 3 is the schematic diagram of the annexation between each module of each module of EPON protection system of the present invention and terminal equipment;
Fig. 4 is the overview flow chart of passive optical network protecting method of the present invention and step S404 thereof;
Fig. 5 is the particular flow sheet of passive optical network protecting method of the present invention when applying to passive optical network terminal; And
Sequential chart when Fig. 6 is the work of EPON protection system of the present invention and method.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
The present invention relates to passive optical network, relate in particular to a kind of method and apparatus of automatic protection of the normal failure light emission that is used for passive optical network terminal (that is optical network unit).
Fig. 1 shows the topological diagram of PON network related to the present invention.As can be seen from the figure, an OLT can connect a plurality of ONU by optical splitter.Downlink data load mode from OLT to ONU is time division multiplexing and physical layer broadcast mode, and promptly each downlink frame can send to the PON port of all ONU.Upstream data load mode from ONU to OLT is the TDMA mode.
Fig. 2 shows the block diagram of EPON protection system of the present invention.As shown in Figure 2, EPON protection system of the present invention comprises: luminous detection unit 202 is used to detect the emission luminous power of optical sender of the terminal equipment of EPON; Protection control unit 204, be used in the scheduled time after terminal equipment begins or finish to send upstream data, judge according to the testing result of luminous detection unit whether terminal equipment fault has taken place, and under the situation that terminal equipment breaks down, the close a terminal optical sender of equipment of indication luminous controling unit; And luminous controling unit 206, the optical sender that is used to the equipment of closing a terminal is to isolate terminal equipment and EPON.
Wherein, protection control unit 204 comprises: timer units 2042 is used for startup transmission beginning timer when terminal equipment begins to send upstream data, and starts transmission stop timing device when terminal equipment is finished the transmission upstream data; Fault judgement unit 2044, be used for sending the beginning timer or sending under the overtime situation of stop timing device, judge according to the testing result of luminous detection unit whether terminal equipment fault has taken place, wherein, detect under the situation of emission luminous power less than predetermined threshold in the luminous detection unit, fault judgement unit judges terminal equipment does not break down, and detects under the situation of emission luminous power greater than predetermined threshold in the luminous detection unit, and fault has taken place fault judgement unit judges terminal equipment.
Wherein, luminous detection unit 202 comprises: receiving element 2022 is used for the light that the optical sender of receiving terminal apparatus sends; And comparing unit 2024, be used for the emission luminous power and the predetermined threshold of the optical sender of terminal equipment are compared.
Wherein, send the maximum possible transmission data time of the fixed time interval of beginning timer greater than terminal equipment.Send the pass response time of the fixed time interval of stop timing device greater than the optical sender of terminal equipment.The protection control unit links to each other with luminous controling unit with the luminous detection unit by holding wire.Luminous controling unit is a switch, and the one end links to each other with the power pin of the optical sender of terminal equipment, and the other end links to each other with DC power supply.
Fig. 3 shows the schematic diagram of the annexation between each module of each module of EPON protection system of the present invention and passive optical network terminal.
As shown in Figure 3, EPON protection system of the present invention comprises protection control unit, luminous detection unit and luminous controling unit.When EPON protection system of the present invention is used for the ONU of EPON, and the annexation between the optical sender of ONU, PON MAC chip and the CPU as shown in Figure 3.Wherein, the protection control unit is connected with PON MAC chip, luminous detection unit, luminous controling unit and CPU respectively.It can be respectively realizes that by a holding wire signalling is to being respectively with being connected of former three: from PON MAC to the protection control unit, from the luminous detection unit to the protection control unit, from the protection control unit to luminous controling unit.Can realize by address bus, data/address bus and control bus with being connected then of CPU.
Wherein, the protection control unit is safeguarded two timers, and one is transmission beginning timer, and another is for sending the stop timing device.Send the beginning timer and start, reset and stop by finishing light emission instruction signal by the beginning light emission instruction signal of luminous detection unit output.Send of the luminous end index signal triggering of stop timing device by PON MAC output.Luminous end timer stops the operation of luminous beginning timer when starting.No matter which timer expiry; the protection control unit will be checked the luminous indication of the optical sender that the luminous detection unit sends this moment; if its expression is just in luminous (as available high level indication physically); then send instruction (as available high level indication physically) and give luminous controling unit, order it to close optical sender.In addition, can also be configured the parameter (as the timer fixed time interval) of protection control unit by CPU.
The emission luminous power of optical sender is responsible for detecting in the luminous detection unit in good time, and compares with threshold value, and the result who obtains is passed to the protection control unit by a holding wire.It can be realized by an optical splitter with being connected of optical sender.
Luminous controling unit is responsible for closing optical sender when normal failure light emission occurring.Whether it closes lighting function by receiving the instruction decision of protecting control unit to send.It can carry out in several ways with being connected of optical sender.Such as: can realize by one 1 * 2 electric switch of serial connection on optical sender transmission power circuit, also can realize by the optical switch that on light path, is connected in series 1 * 2.
In addition, need to prove: when specific implementation, above-mentioned three unit can be realized with independent physical device as mentioned above, also the protection control unit can be integrated with CPU physically.If the in good time luminous power inquiry of optical sender support is equivalent to comprise in the optical sender photo-detector, then comparator function can be realized by software on CPU in the optical detecting unit.
That is to say that EPON protection system of the present invention is made up of following three parts: protection control unit, luminous detection unit and luminous controling unit.Wherein, the protection control unit is the core of whole system, is used for detection failure and handling failure.Its inner realization timer function, logic judging function and control signal sending function of needing.The luminous detection unit in fact mainly is a photo-detector and a comparator.It is responsible for the transmission light signal situation of optical sender is detected in good time, and optical power value and the predefined threshold value that records compared, and then comparative result is passed to the protection control unit.Luminous controling unit is similar to a switch, and whether it is used for controlling optical sender luminous, and the control of its protected control unit is responsible for finishing the operation that opens or closes to optical sender.
Wherein, the annexation of each unit is as follows: protect control unit all to have with other parts and be connected.At first, it links to each other with PON MAC by a holding wire, to obtain the state that data send.Secondly, it also links to each other with the luminous detection unit by a holding wire, to obtain current luminous situation.At last, also need to be connected with luminous controling unit, to reach the luminous purpose of control optical sender by a holding wire.The luminous detection unit is connected with the protection control unit on the one hand, is connected with optical sender on the one hand.With the protection control unit connected mode as mentioned above.The concrete form that is connected with optical sender then can have multiple, such as: can link to each other with the transmit port of optical sender by optical splitter.Luminous controling unit and luminous detection unit class seemingly are connected with the protection control unit on the one hand, also will link to each other with optical sender on the one hand.With being connected as mentioned above of protection control unit.With being connected also of optical sender various ways can be arranged, such as: can be used as a switch, a side links to each other with the power pin of optical sender, and a side links to each other with DC power supply.
Fig. 4 shows the overview flow chart of passive optical network protecting method of the present invention.As shown in Figure 4, passive optical network protecting method of the present invention may further comprise the steps: S402, and the luminous detection unit detects the emission luminous power of the optical sender of the terminal equipment of EPON; S404, the protection control unit judges according to the testing result of luminous detection unit whether terminal equipment fault has taken place in the scheduled time after terminal equipment begins and/or finish to send upstream data; And S406, when the protection control unit is judged terminal equipment and is broken down, the close a terminal optical sender of equipment of luminous controling unit, thereby with terminal equipment and EPON isolation.
Wherein, in step S402, the luminous detection unit compares the emission luminous power and the predetermined threshold of the optical sender of terminal equipment.
Wherein, step S404 may further comprise the steps: S4042, protection control unit start transmission beginning timer when terminal equipment begins to send upstream data, start transmission stop timing device when terminal equipment finishes to send upstream data; S4044, send the beginning timer or sending the stop timing device when overtime, the protection control unit judges according to the testing result of luminous detection unit whether terminal equipment fault has taken place, wherein, when detecting the emission luminous power less than predetermined threshold in the luminous detection unit, the protection control unit judges that terminal equipment does not break down; Detect under the situation of emission luminous power greater than predetermined threshold in the luminous detection unit, the protection control unit judges that fault has taken place terminal equipment.
Wherein, send the maximum possible transmission data time of the fixed time interval of beginning timer greater than terminal equipment.Send the pass response time of the fixed time interval of stop timing device greater than the optical sender of terminal equipment.
Particularly, with reference to figure 5, the detailed process when passive optical network protecting method of the present invention applies to EPON is described.As shown in Figure 5, after EPON protection system of the present invention was started working, PON MAC was authorizing time slot to begin to send upstream data (S502).This moment, optical detecting unit detected luminously, and the output light emission instruction signal is to the protection control unit, and the protection control unit start to send beginning timer (S504).PON MAC sends (S506) after the data, also sends to the protection control unit and finishes indication (S508), triggers the latter and starts and send the stop timing device, and the transmission before stopping simultaneously beginning timer operation (S510).The protection control unit detects timer whether overtime (S512); if timer expiry (no matter which timer); then check the luminous indication (S514) of sending the luminous detection unit; whether the result that the protection control unit detects luminous indication shows that optical sender is still outwards sending light signal (S516); if the index signal of this moment shows optical sender and is still outwards sending light signal; then assign out code, close the sending function (S518) of optical sender to luminous controling unit.Thereby finish the isolation of faulted ONU and PON network.
That is to say, passive optical network protecting method of the present invention is realized by following steps: the luminous detection unit detects the emission luminous power of optical sender always, with the threshold value that sets in advance relatively (luminous power when sending " 0 " bit), and comparative result sent to the protection control unit; The PON MAC chip of ONU begins to send upstream data, and exports an index signal and give the protection control unit when being sent completely; The protection control unit is received come from the luminous detection unit luminous and is begun to indicate and start a timer (be called and send the beginning timer and send the stop timing device) respectively after the transmission that PON MAC chip comes finishes indication, and finishes the indication back or detect luminously to stop to send the beginning timer after stopping indication receiving to send.The fixed time interval that sends the beginning timer is configurable, and its value should send data time (as: dispatching cycle of DBA) greater than the ONU maximum possible.The fixed time interval that sends the stop timing device should be greater than the pass response time (Laser-offTime) of optical sender, less than the pass response time of twice; No matter behind which timer expiry, whether the protection control unit all will check optical sender still luminous by the luminous detection unit, if still luminous, think that then normal failure light emission appears in ONU, then the operating light-emitting control unit; The protection control unit is closed the luminous of optical sender by the operating light-emitting control unit, realizes the isolation with the PON network.
Sequential chart when Fig. 6 shows the inventive method and system works.The situation that is to use transmission stop timing device and ONU to break down that provides among the figure.For convenience's sake, all in the drawings useful signals are all represented with high level.
By the present invention, make and automatically to detect normal failure light emission at the terminal equipment place of EPON, and can when breaking down, close optical sender automatically, thereby can avoid interference to other-end equipment, and then shortened the recovery time of EPON when such fault occurring greatly, improved the robustness and the reliability of EPON.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. an EPON protection system is characterized in that, described system comprises:
The luminous detection unit is used to detect the emission luminous power of optical sender of the terminal equipment of described EPON;
The protection control unit, be used in the scheduled time after described terminal equipment begins or finish to send upstream data, judge according to the testing result of described luminous detection unit whether described terminal equipment fault has taken place, and under the situation that described terminal equipment breaks down, the indication luminous controling unit is closed the optical sender of described terminal equipment; And
Described luminous controling unit is used to close the optical sender of described terminal equipment so that described terminal equipment and described EPON are isolated.
2. EPON protection system according to claim 1 is characterized in that, described protection control unit comprises:
Timer units is used for starting transmission beginning timer when described terminal equipment begins to send upstream data, and startup sends the stop timing device when described terminal equipment is finished the transmission upstream data;
The fault judgement unit is used for beginning to judge according to the testing result of described luminous detection unit whether described terminal equipment fault has taken place under the overtime situation of timer or described transmission stop timing device in described transmission,
Wherein, detect under the situation of described emission luminous power less than predetermined threshold in described luminous detection unit, the described terminal equipment of described fault judgement unit judges does not break down,
Detect under the situation of described emission luminous power greater than described predetermined threshold in described luminous detection unit, fault has taken place in the described terminal equipment of described fault judgement unit judges.
3. EPON protection system according to claim 1 and 2 is characterized in that, described luminous detection unit comprises:
Receiving element is used to receive the light signal that the optical sender of described terminal equipment sends; And
Comparing unit is used for the emission luminous power and the described predetermined threshold of the optical sender of described terminal equipment are compared.
4. EPON protection system according to claim 3 is characterized in that, described transmission begins the maximum possible transmission data time of the fixed time interval of timer greater than described terminal equipment.
5. EPON protection system according to claim 3 is characterized in that, the fixed time interval of described transmission stop timing device is greater than the pass response time of the optical sender of described terminal equipment.
6. EPON protection system according to claim 3 is characterized in that, described protection control unit links to each other with described luminous controling unit with described luminous detection unit by holding wire.
7. EPON protection system according to claim 3 is characterized in that described luminous controling unit is a switch, and the one end links to each other with the power pin of the optical sender of described terminal equipment, and the other end links to each other with DC power supply.
8. a passive optical network protecting method is characterized in that, said method comprising the steps of:
S402, the luminous detection unit detects the emission luminous power of the optical sender of the terminal equipment of described EPON;
S404, the protection control unit judges according to the testing result of described luminous detection unit whether described terminal equipment fault has taken place in the scheduled time after described terminal equipment begins or finish to send upstream data; And
S406, when described protection control unit was judged described terminal equipment and broken down, luminous controling unit was closed the optical sender of described terminal equipment, thereby described terminal equipment and described EPON are isolated.
9. passive optical network protecting method according to claim 8 is characterized in that, in described step S402, described luminous detection unit compares the emission luminous power and the predetermined threshold of the optical sender of described terminal equipment.
10. according to Claim 8 or 9 described passive optical network protecting methods, it is characterized in that described step S404 may further comprise the steps:
S4042, described protection control unit start transmission beginning timer when described terminal equipment begins to send upstream data, start transmission stop timing device when described terminal equipment finishes to send upstream data;
S4044 begins timer or described transmission stop timing device when overtime in described transmission, and described protection control unit judges according to the testing result of described luminous detection unit whether described terminal equipment fault has taken place,
Wherein, when detecting described emission luminous power less than described predetermined threshold in described luminous detection unit, described protection control unit judges that described terminal equipment does not break down; Detect under the situation of described emission luminous power greater than described predetermined threshold in described luminous detection unit, described protection control unit judges that fault has taken place described terminal equipment.
11. passive optical network protecting method according to claim 10 is characterized in that, described transmission begins the maximum possible transmission data time of the fixed time interval of timer greater than described terminal equipment.
12. passive optical network protecting method according to claim 10 is characterized in that, the fixed time interval of described transmission stop timing device is greater than the pass response time of the optical sender of described terminal equipment.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710087367A CN100589346C (en) | 2007-03-14 | 2007-03-14 | System and method for protecting passive optical network |
| KR1020097021260A KR101402527B1 (en) | 2007-03-14 | 2007-12-26 | Protecting System And Method For Passive Optical Network |
| PCT/CN2007/003814 WO2008110051A1 (en) | 2007-03-14 | 2007-12-26 | Protecting system and method for passive optical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710087367A CN100589346C (en) | 2007-03-14 | 2007-03-14 | System and method for protecting passive optical network |
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| Publication Number | Publication Date |
|---|---|
| CN101039147A true CN101039147A (en) | 2007-09-19 |
| CN100589346C CN100589346C (en) | 2010-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710087367A Expired - Fee Related CN100589346C (en) | 2007-03-14 | 2007-03-14 | System and method for protecting passive optical network |
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| Country | Link |
|---|---|
| KR (1) | KR101402527B1 (en) |
| CN (1) | CN100589346C (en) |
| WO (1) | WO2008110051A1 (en) |
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| WO2008110051A1 (en) * | 2007-03-14 | 2008-09-18 | Zte Corporation | Protecting system and method for passive optical network |
| CN102045105A (en) * | 2009-10-14 | 2011-05-04 | 中兴通讯股份有限公司 | Fault active detection and isolation method and optical line unit |
| CN101674499B (en) * | 2008-09-12 | 2012-09-26 | 株式会社日立制作所 | Passive optical network system and fault determination method thereof |
| CN102843181A (en) * | 2011-06-20 | 2012-12-26 | 中兴通讯股份有限公司 | Device and method for long light-emitting protection of passive optical network |
| WO2013131336A1 (en) * | 2012-03-06 | 2013-09-12 | 中兴通讯股份有限公司 | Method and device for detecting abnormal light-emission of optical module of optical network unit |
| CN109075887A (en) * | 2016-04-28 | 2018-12-21 | 华为技术有限公司 | Channel bonding in multi-wavelength passive optical network (PON) |
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| CN109560866A (en) * | 2018-12-28 | 2019-04-02 | 东南大学 | Passive optical network link monitoring system and method based on tunable laser |
| CN113016152A (en) * | 2018-11-23 | 2021-06-22 | 昕诺飞控股有限公司 | Interference-free scheduling for wireless optical networks with multiple coordinators |
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| US11483073B2 (en) * | 2018-11-23 | 2022-10-25 | Signify Holding B.V. | Interference handling by automatic time slot allocation for multiple coordinators |
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| JP3980422B2 (en) * | 2002-06-27 | 2007-09-26 | 三菱電機株式会社 | Optical transmitter |
| JP4228693B2 (en) | 2002-07-22 | 2009-02-25 | 住友電気工業株式会社 | PON (Passive Optical Network) system |
| KR100547783B1 (en) * | 2003-07-05 | 2006-01-31 | 삼성전자주식회사 | Optical signal power level measuring apparatus in Gigabit passive optical subscriber network and OLT |
| WO2005036783A1 (en) * | 2003-10-15 | 2005-04-21 | Exfo Electro-Optical Engineering Inc. | Method and apparatus for testing optical networks |
| KR100675839B1 (en) * | 2004-12-10 | 2007-01-29 | 한국전자통신연구원 | System and method for monitoring and controlling the optical characteristics of the optical transceiver in WDM-PONs |
| CN101047442B (en) * | 2006-04-02 | 2012-05-30 | 华为技术有限公司 | Maintenance method of passive optical network and its system |
| CN100589346C (en) * | 2007-03-14 | 2010-02-10 | 中兴通讯股份有限公司 | System and method for protecting passive optical network |
-
2007
- 2007-03-14 CN CN200710087367A patent/CN100589346C/en not_active Expired - Fee Related
- 2007-12-26 WO PCT/CN2007/003814 patent/WO2008110051A1/en active Application Filing
- 2007-12-26 KR KR1020097021260A patent/KR101402527B1/en active IP Right Grant
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| WO2008110051A1 (en) * | 2007-03-14 | 2008-09-18 | Zte Corporation | Protecting system and method for passive optical network |
| CN101674499B (en) * | 2008-09-12 | 2012-09-26 | 株式会社日立制作所 | Passive optical network system and fault determination method thereof |
| CN102045105A (en) * | 2009-10-14 | 2011-05-04 | 中兴通讯股份有限公司 | Fault active detection and isolation method and optical line unit |
| CN102843181A (en) * | 2011-06-20 | 2012-12-26 | 中兴通讯股份有限公司 | Device and method for long light-emitting protection of passive optical network |
| CN102843181B (en) * | 2011-06-20 | 2018-06-19 | 中兴通讯股份有限公司 | A kind of long luminous protector of passive optical network and method |
| WO2013131336A1 (en) * | 2012-03-06 | 2013-09-12 | 中兴通讯股份有限公司 | Method and device for detecting abnormal light-emission of optical module of optical network unit |
| CN109075887A (en) * | 2016-04-28 | 2018-12-21 | 华为技术有限公司 | Channel bonding in multi-wavelength passive optical network (PON) |
| US10763988B2 (en) | 2016-04-28 | 2020-09-01 | Futurewei Technologies, Inc. | Channel bonding in multiple-wavelength passive optical networks (PONs) |
| CN109075887B (en) * | 2016-04-28 | 2020-12-01 | 华为技术有限公司 | Channel bonding in a multi-wavelength Passive Optical Network (PON) |
| CN113016152A (en) * | 2018-11-23 | 2021-06-22 | 昕诺飞控股有限公司 | Interference-free scheduling for wireless optical networks with multiple coordinators |
| CN109274422A (en) * | 2018-11-29 | 2019-01-25 | 四川光恒通信技术有限公司 | A kind of optical module test macro and method |
| CN109274422B (en) * | 2018-11-29 | 2023-05-26 | 四川光恒通信技术有限公司 | Optical module testing system and method |
| CN109560866A (en) * | 2018-12-28 | 2019-04-02 | 东南大学 | Passive optical network link monitoring system and method based on tunable laser |
| CN109560866B (en) * | 2018-12-28 | 2024-01-19 | 东南大学 | Passive optical network link monitoring system and method based on tunable laser |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20100015508A (en) | 2010-02-12 |
| WO2008110051A1 (en) | 2008-09-18 |
| KR101402527B1 (en) | 2014-06-03 |
| CN100589346C (en) | 2010-02-10 |
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