CN2824439Y - Optical line terminal - Google Patents
Optical line terminal Download PDFInfo
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- CN2824439Y CN2824439Y CNU2005200671549U CN200520067154U CN2824439Y CN 2824439 Y CN2824439 Y CN 2824439Y CN U2005200671549 U CNU2005200671549 U CN U2005200671549U CN 200520067154 U CN200520067154 U CN 200520067154U CN 2824439 Y CN2824439 Y CN 2824439Y
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Abstract
The utility model discloses an optical line terminal which comprises a service processing module, a switching module, a primary optical module and a spare optical module, wherein an input terminal of the switching module is connected with the service processing module, and the primary optical module and the spare optical module are respectively connected with an output terminal; the primary optical module and the spare optical module are respectively connected with a primary optical fiber and a spare optical fiber. The utility model has the advantages that cost for the open circuit protection of passive optical network systems can be reduced, the difficulty of maintenance care is reduced, the speed of protection switching is increased and the number of the occupied service passages is reduced.
Description
Technical field
The utility model relates to optical communication field, is specifically related to a kind of optical line terminal of passive optical network.
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.And EPON (PON) has adopted passive device, is to realize the most potential technology of broadband light Access Network.
Be different from the transmission course of upstream to the transmission course of the downstream data flow of user resident in the PON network.Downstream data flow is broadcast to each ONT from OLT, and each ONT only handles the data of destination address and himself coupling by the address information in the match protocol transmission unit head.Because there is the characteristic of sharing medium in ODN, up traffic transport is comparatively complicated.For fear of the generation of conflict, upstream adopts TDMA (time division multiple access) mode, and according to the controlling mechanism of OLT the transmission of up direction is controlled.Like this, the specific ONT of specific transmission time sheet representative, these timeslices can be avoided producing conflict between the burst of different ONT synchronously.
As shown in Figure 1, a typical passive optical network is made up of optical line terminal (OLT), optical network unit (ONU), optical distribution network (ODN).Optical line terminal centre office, optical network unit is placed near the network interface unit or with it and is integrated.Optical distribution network 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 actual applications; protection to optical cable or fault becomes extremely important; existing protected mode as shown in Figure 2; Service Processing Module PON-LT (0) and protection module PON-LT (1) are set in optical line terminal; Service Processing Module PON-LT (0) is connected with 2 * N optical distribution network by an optical fiber respectively with protection module PON-LT; wherein, the PON-LT protection module adopts the Hot Spare scheme.Signal from the work optical line terminal is used optical fiber, 2 * N optical distribution network through the master successively, enters the work optical network unit at last.When the master between work optical line terminal and 2 * N optical distribution network was lost efficacy with optical fiber, the standby optical fiber that is attached thereto was activated, and passed through standby optical fiber, 2 * N optical distribution network successively from the signal of PON-LT protection module, entered the work optical network unit at last.
Yet there is following deficiency in existing protection scheme:
1, cost height needs two cover OLT equipment.
2, maintenance management inconvenience backs up and will safeguard a cover and main with the identical configuration data of OLT on the OLT, and when the master used the OLT configuration change, spare OLT also will be changed.
3, need take two-way Business Processing passage (or switching port), the protection passage is in idle state in normal operation.
4, it is slow that speed is switched in protection.After main fiber line fault, need just can finish switching through following steps:
A, master detect link failure with OLT;
B, master notify master control borad with OLT, turn-off optical module simultaneously;
C, master control borad notice spare OLT veneer;
D, spare OLT veneer are opened optical module.
The utility model content
Technical problem to be solved in the utility model is, a kind of optical line terminal with break protecting is provided, and can solve problems of the prior art; this system cost is reduced; maintenance management is more convenient, takies service channel still less, and it is faster that speed is switched in protection.
For solving the problems of the technologies described above, the utility model has adopted following technical scheme: a kind of optical line terminal is provided, comprises Service Processing Module, handover module, main with optical module and standby optical module; The input of described handover module is connected with described Service Processing Module, and output is connected with optical module and standby optical module with main respectively; The described main optical module of using is connected with a standby optical fiber with optical fiber with a master respectively with standby optical module.
Preferably, described handover module has an input port and two output ports; Described input port is connected with described Service Processing Module, forms first passage; Described two output ports are connected with standby optical module with optical module with described master respectively, form second channel and third channel; Described first passage main with communication line when working properly with described second channel conducting, and with described third channel disconnection.
Preferably, described handover module also has a control port, and described control port is connected with a control module, when described control module breaks down with communication line the master, controls described handover module with described first passage and third channel conducting.
Preferably, described control module also links to each other with described Service Processing Module.
Preferably, described Service Processing Module comprises string and converting unit and medium access control unit.
The utility model compared with prior art because it is main with switching between communication line and the alternate channel to have adopted handover module to realize, than traditional two OLT redundancy backup modes, has nearly been saved half on cost.And only take one tunnel Business Processing passage (or switching port), can because being provided, protection not cause the access customer number amount to reduce.And traditional two OLT redundant fashions will make the access customer number amount reduce half.Behind the line failure, only need on handover module, switch,, simplify the maintenance management work of OLT software greatly the Service Processing Module not influence fully of back; And protection to switch speed fast, only need software to do simple process or finish by hardware fully, safe and reliable.
Description of drawings
Fig. 1 is the schematic diagram of existing passive optical network;
Fig. 2 is the existing schematic diagram that has the passive optical network of open circuit protection;
Fig. 3 is the schematic diagram that has the passive optical network of optical line terminal in the utility model;
Fig. 4 is the schematic diagram of optical line terminal in the utility model;
Fig. 5 is the open circuit protection flow chart that has the EPON of optical line terminal in the utility model.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model is described in further detail.
Fig. 3 shows the preferred embodiment that the utility model has the passive optical network of optical line terminal in the utility model, and it mainly is made up of with optical fiber 2, standby optical fiber 3, optical distribution network (ODN) 4, optical network unit (ONU) 5 and optical fiber 6 etc. optical line terminal (OLT) 1, master.Optical network unit 5 is connected with optical distribution network 4 by optical fiber 6, and optical distribution network 4 is connected with optical line terminal 1 with standby optical fiber 3 with optical fiber 2 by the master again, forms parallel main communication line and the alternate channel used.
As shown in Figure 4, optical line terminal (OLT) 1 comprises main with optical module 11, standby optical module 12, handover module 13, Service Processing Module 14 and control module 15.The main optical module 11 of using is connected with standby optical fiber 3 with optical fiber 2 with main respectively with standby optical module 12, is used to realize light/electricity, electricity/light conversion.Handover module 13 has an input port, two output ports and a control port; Its input port is connected with Service Processing Module 14, forms first passage; Two output ports are connected with standby optical module 12 with optical module 11 with main respectively, form second channel and third channel; First passage, and disconnects with third channel with communication line when working properly and the second channel conducting main; Control port links to each other with control module 15, and when control module 15 broke down with communication line the master, control handover module 13 was with first passage and third channel conducting.
In the present embodiment, handover module 13 can adopt VSC7132-01 electronic switch and peripheral electronic component thereof to constitute. Optical module 11,12 can adopt PT8958-53-3T-SC/PC-LT chip and peripheral electronic component thereof to constitute.Control module 15 can adopt MPC8245 chip and peripheral electronic component thereof to constitute.Service Processing Module 14 mainly comprises Serdes (string and conversion) unit and MAC (medium access control) unit, and wherein, the serdes unit can adopt S2060A chip and peripheral electronic component thereof to constitute; The MAC unit can adopt PAS5001 chip and peripheral electronic component thereof to constitute.
System works just often, sending direction, handover module 13 sends to the main optical module 11 of using with the 1.25G signal of telecommunication of Service Processing Module 14 outputs, and the master converts the electrical signal to light signal with optical module 11, and light signal process successively is main with optical fiber 2, optical distribution network 4, optical fiber 6 arrival optical network units 5.Receive direction is finished opto-electronic conversion through main with optical module 11 from the light signal of optical network unit 5, and the output 1.25Gbit/s signal of telecommunication is sent to Service Processing Module 14 through handover module 13.
When the master is broken down with optical module 11 with optical fiber 2 disconnected fibres or master, main optical module 11 and/or the Service Processing Module 14 used can pass through detection method (as the SD signal, link Link state, error code thresholding etc.) detect, and report control module 15, control module 15 control handover modules 13 switch to standby optical fiber 3 from main with optical fiber 2 with signal, standby optical fiber 3 is connected with Service Processing Module 14, and send alarm signal, handoff procedure can be finished by software control, also can be finished automatically by hardware.After protection is switched, arrive optical network units 5 through optical module 12, handover module 13, standby optical fiber 3, optical distribution network 4 and optical fiber 6 respectively from the signal of telecommunication of Service Processing Module 14.
Fig. 5 is the control protection flow chart of the utility model control module 15.
Flow chart is resolved as follows:
In the 1st step, the defence program of control module is started working;
In the 2nd step, obtain main state parameter with optical fiber from Service Processing Module;
The 3rd step, judge by this state parameter whether the master breaks down with optical fiber, if not, got back to for the 1st step, if, to the 4th step;
The 4th step, handover module is sent switching command, will communicate by letter switches to standby optical fiber from main with optical fiber, and sends alarm signal.
In the utility model, handover module can adopt existing electronic switching device, and is very cheap; and have high and fast characteristics of switch speed of reliability; use two light mouths to add the protected mode of handover module,, nearly on cost, saved half than traditional two OLT redundancy backup modes.And only take one tunnel Business Processing passage (or switching port), can because being provided, protection not cause the access customer number amount to reduce.And traditional two OLT redundant fashions will make the access customer number amount reduce half.
Behind the line failure, only need on handover module, switch,, simplify the maintenance management work of OLT software greatly the Service Processing Module not influence fully of back; And protection to switch speed fast, only need software to do simple process or finish by hardware fully, safe and reliable.
Though consult embodiment the utility model is described, those skilled in the art should understand can do various changes, and also available equivalents substitutes, and these do not exceed scope of the present utility model.In addition, can do many changes so that concrete condition and material are suitable for content of the present utility model, these do not exceed scope of the present utility model.So the utility model should not be limited to disclosed specific embodiment, but the utility model will be included in all embodiment in the claim.
Claims (5)
1. an optical line terminal comprises Service Processing Module, it is characterized in that, also comprises handover module, main with optical module and standby optical module; The input of described handover module is connected with described Service Processing Module, and output is connected with optical module and standby optical module with main respectively; The described main optical module of using is connected with a standby optical fiber with optical fiber with a master respectively with standby optical module.
2. optical line terminal according to claim 1 is characterized in that, described handover module has an input port and two output ports; Described input port is connected with described Service Processing Module, forms first passage; Described two output ports are connected with standby optical module with optical module with described master respectively, form second channel and third channel; Described first passage main with communication line when working properly with described second channel conducting, and with described third channel disconnection.
3. optical line terminal according to claim 2, it is characterized in that, described handover module also has a control port, described control port is connected with a control module, when described control module breaks down with communication line the master, control described handover module with described first passage and third channel conducting.
4. optical line terminal according to claim 3 is characterized in that, described control module also links to each other with described Service Processing Module.
5. according to claim 1 or 2 or 4 described optical line terminals, it is characterized in that described Service Processing Module comprises string and converting unit and medium access control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200671549U CN2824439Y (en) | 2005-11-04 | 2005-11-04 | Optical line terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200671549U CN2824439Y (en) | 2005-11-04 | 2005-11-04 | Optical line terminal |
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| CN2824439Y true CN2824439Y (en) | 2006-10-04 |
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| CNU2005200671549U Expired - Lifetime CN2824439Y (en) | 2005-11-04 | 2005-11-04 | Optical line terminal |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101600128B (en) * | 2009-06-30 | 2012-10-17 | 中兴通讯股份有限公司 | ONU and method for achieving all-fiber protection switching |
| CN102761446A (en) * | 2012-07-30 | 2012-10-31 | 太仓市同维电子有限公司 | PON (Passive Optical Network) drop preventing method and PON system |
| CN104836621A (en) * | 2015-05-25 | 2015-08-12 | 博为科技有限公司 | Optical network equipment |
| CN105281931A (en) * | 2014-06-18 | 2016-01-27 | 中兴通讯股份有限公司 | Error code detection method, device and system of POTN |
| CN107040309A (en) * | 2017-05-09 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of fiber optic communication chain rupture quick monitoring method based on physical layer |
| CN109144794A (en) * | 2018-08-14 | 2019-01-04 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Redundant Ethernet card |
| CN113872685A (en) * | 2020-06-30 | 2021-12-31 | 华为技术有限公司 | Optical line terminal OLT equipment and optical path processing method |
-
2005
- 2005-11-04 CN CNU2005200671549U patent/CN2824439Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600128B (en) * | 2009-06-30 | 2012-10-17 | 中兴通讯股份有限公司 | ONU and method for achieving all-fiber protection switching |
| 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 |
| CN102684810B (en) * | 2012-01-18 | 2015-07-22 | 徐志国 | Optical network protection method, optical link switching control device and optical link switching control system |
| CN102761446A (en) * | 2012-07-30 | 2012-10-31 | 太仓市同维电子有限公司 | PON (Passive Optical Network) drop preventing method and PON system |
| CN105281931A (en) * | 2014-06-18 | 2016-01-27 | 中兴通讯股份有限公司 | Error code detection method, device and system of POTN |
| CN105281931B (en) * | 2014-06-18 | 2019-11-29 | 南京中兴新软件有限责任公司 | Bit error detection method, the apparatus and system of POTN |
| CN104836621A (en) * | 2015-05-25 | 2015-08-12 | 博为科技有限公司 | Optical network equipment |
| CN107040309A (en) * | 2017-05-09 | 2017-08-11 | 南京南瑞继保电气有限公司 | A kind of fiber optic communication chain rupture quick monitoring method based on physical layer |
| CN107040309B (en) * | 2017-05-09 | 2020-07-28 | 南京南瑞继保电气有限公司 | Optical fiber communication broken link rapid monitoring method based on physical layer |
| CN109144794A (en) * | 2018-08-14 | 2019-01-04 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Redundant Ethernet card |
| CN113872685A (en) * | 2020-06-30 | 2021-12-31 | 华为技术有限公司 | Optical line terminal OLT equipment and optical path processing method |
| CN113872685B (en) * | 2020-06-30 | 2023-04-11 | 华为技术有限公司 | Optical line terminal OLT equipment and optical path processing method |
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