CN100539475C - A kind of devices and methods therefor of in EPON, fibre circuit being protected - Google Patents
A kind of devices and methods therefor of in EPON, fibre circuit being protected Download PDFInfo
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- CN100539475C CN100539475C CNB2007100006351A CN200710000635A CN100539475C CN 100539475 C CN100539475 C CN 100539475C CN B2007100006351 A CNB2007100006351 A CN B2007100006351A CN 200710000635 A CN200710000635 A CN 200710000635A CN 100539475 C CN100539475 C CN 100539475C
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Abstract
The invention provides a kind of devices and methods therefor that realization is protected fibre circuit in PON.Wherein adopt in the local side OLT side and use the key fibre circuit of the respectively corresponding two-way of two optical modules, the reception of two ways of optical signals and transmission can be opened and closed operation respectively by control.When system works during in key optical fibre protection inverting mode, have only one to send downlink optical signal in two optical modules, also have only wherein one the tunnel can selectedly pass through in the uplink optical signal that two optical modules receive; When system works during in the all-fiber protection switching mode, two optical modules send downlink optical signal simultaneously, and the uplink optical signal that two optical modules receive is selected passing through simultaneously also.Professional long-time interruption can not take place according to the present invention again, and the attendant can send the engineering staff that out of order optical link is repaired and without interrupting service according to corresponding alarm again.
Description
Technical field
The present invention relates to fiber optic communication field, refer more particularly to the apparatus and method that realization is protected fibre circuit in EPON (PON).
Background technology
Development through the several years, APON and BPON from early stage off-gauge arrowband PON and standard, until be expected in nearly 2 years based on the EPON of the ieee standardization of ethernet technology with based on the standardized GPON of the ITU-T of GFP, the PON technology passed by one progressively improve, perfect course.As present ideal FTTH broadband access method, the PON technology has been entrusted to the care of optical communication worker ideal in the heart.No matter be EPON or GPON, they all have identical network topology structure.How allowing their high efficient and reliable ground work in communication network move, is the problem that we must often will be thought deeply.
PON is made up of the optical line terminal that is positioned at local side (OLT) and several optical network units (ONU) that is positioned at far-end.Connect by passive light distribution network (ODN) between OLT and the ONU.PON adopts point to multiple spot (P2MP) topological structure, sees Fig. 1.We are commonly called as the signal trend that transmits a signal to the ONU side from the OLT side and are down direction; The signal that transmits a signal to the OLT side from the ONU side is moved towards to be commonly called as to be up direction.
The PON system generally all adopts the mode of single fiber bi-directional to carry out networking at present, and local side optical interface and far-end optical interface all have only an optical fiber to the optical fiber cable trackside.When fibre circuit abnormal failure such as optical cable partly takes place because of being subjected to external force and rupturing or human operational error when pulling out the light joint as mistake, can cause being connected all between the intrasystem terminal OLT device of whole PON and all far-end ONU equipment to interrupt, thereby make whole system in paralyzed state for a long time.This shows,, will be unfavorable for the reliable and stable of whole system if partly do not increase a standby optical-fibre channel at fibre circuit.
Two kinds of typical optical fibre protection inverting modes of the general employing of current PON, it disposes as shown in Figures 2 and 3.Wherein Fig. 2 is the key optical fibre protection inverting allocation plan in the PON system.When abnormal failure partly takes place in key fibre circuit, system can automatically switch to an other intact fibre circuit job, professional long-time interruption can not take place again, and the attendant can send the engineering staff that out of order fibre circuit is repaired according to corresponding alarm again.In addition, when the attendant need carry out maintenance test to the key fibre circuit that is using, only need be by a Forced Switch order is set on the local side webmaster, just system can be switched to an other key fibre circuit, thereby that the key fibre circuit that easily free time is got off is safeguarded.Fig. 3 is the all-fiber protection switching allocation plan in the PON system.All-fiber protection switching adopts the optical interface and the fibre circuit of active and standby two cover independent O LT, ONU side; except all functions that can satisfy key fiber optic protection; can also realize that the protection of active and standby fibre circuit switches in the ONU side, benefit is that reliability is higher, and weak point is that cost is higher.
We find that through the optical fibre protection inverting mode based on EPON of applying for patent being inquired about the back the current protection switchover mode of taking mainly contains two kinds.First kind of mode is to use optical switch to switch in the 0LT side; its weak point is owing to only adopted an optical module; when system works can't be known the operating state of the key fibre circuit in another road when the key fibre circuit in last road the time; will cause system that the caused consequence of the protection switching action that is about to take is produced unpredictability like this; therefore has the unsettled hidden danger of the system of causing; more typical example is when doing the Forced Switch operation, may switch over by force with regard to interrupting owing to an other key fibre circuit itself.Another mode is to use the key fibre circuit of the respectively corresponding two-way of two optical modules in the 0LT side; its benefit is not have light signal and obtain state information on the key fibre circuit of two-way by the receipts that provide on two optical modules are provided; a kind of mistake of mode before avoiding taking place; but because this mode is to the master; what be equipped with that the two-way upward signal that receives on the fibre circuit adopts is to select one mode to handle in two; so can't be on hardware compatible key optical fibre protection inverting and these two kinds typical fibre circuit protected modes of all-fiber protection switching, obviously have defective like this.
Summary of the invention
The invention provides a kind of device that realization is protected fibre circuit in PON, it comprises: the master uses the fibre circuit optical transceiver module, is used for main with the opto-electronic conversion on the fibre circuit; Standby fibre circuit optical transceiver module is used for the opto-electronic conversion on the standby fibre circuit; Passive optical network PON local side control unit, link to each other with the combinational logic array with the fibre circuit optical transceiver module with active and standby, whether it is luminous or not luminous can controlling primary, spare optical module according to switching strategy, simultaneously also can by allow the upward signal on the primary, spare fibre circuit pass through smoothly to the control of combinational logic array decision; Main with fibre circuit and logic, when PON local side control unit during, make the PON upward signal in the past straight-through to its input high level; When to its input low level, allow the PON upward signal that passes through become low level;
Standby fibre circuit and logic when PON local side control unit during to its input high level, make the PON upward signal in the past straight-through; When to its input low level, allow the PON upward signal that passes through become low level; Or logic, the upward signal that two-way is passed through carries out or logical operation is gone signal on the way and sent back one-level circuit to and handle to be combined into.
The present invention also provides a kind of method that realization is protected fibre circuit in PON, and it comprises step: the control module initialization is switched in key fibre circuit protection, system's setting is operated in main with on the fibre circuit; When primary, spare optical module all is in the no light state of receipts, passive optical network PON local side control unit will switch to another fibre circuit to system from the fibre circuit of work at present and get on, and continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then; When the master receives unglazed standby optical module receipts with optical module there is the light time, passive optical network PON local side control unit will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, and continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then; Receive unglazed master when standby optical module and arranged the light time with the optical module receipts, passive optical network PON local side control unit will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then; When all being in, receives when light state is arranged primary, spare optical module, passive optical network PON local side control unit will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
The present invention also provides a kind of method that realization is protected fibre circuit in EPON, it comprises step: the control module initialization is switched in the full fibre circuit protection of far-end, at this moment regardless of the situation on the active and standby fibre circuit, all system's setting is operated in main with on the fibre circuit; When primary, spare optical module all is in the no light state of receipts, passive optical network PON local side control unit can ceaselessly be surveyed the receipts of exporting on the primary, spare optical module does not have light signal, has received light signal on which optical module and just entire equipment is switched to corresponding that fibre circuit and get in case detect; When the master receives unglazed standby optical module receipts with optical module there is the light time, passive optical network PON local side control unit will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, and continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis; Receive unglazed master when standby optical module and arranged the light time with the optical module receipts, passive optical network PON local side control unit will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis; When all being in, receives when light state is arranged primary, spare optical module, passive optical network PON local side control unit will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
The devices and methods therefor that realization is protected fibre circuit in PON that proposes according to the present invention; when abnormal failure partly takes place in fibre circuit; system can automatically switch to an other intact fibre circuit job; professional long-time interruption can not take place again, and the attendant can send the engineering staff that out of order fibre circuit is repaired according to corresponding alarm again.In addition, when the attendant need carry out maintenance test to the fibre circuit that is using, only need just system can be switched to an other fibre circuit, thereby that fibre circuit that easily free time is got off be safeguarded on the local side webmaster by a Forced Switch order is set.So not only saved the operation and the maintenance cost of operator, the while has also been improved the efficient of service, has shortened to be the time of user's interrupting service, thereby has obtained higher user satisfaction.In addition, the present invention adopts simple combinational logic circuit that signal flow is controlled, and than adopting the mode that increases the PON kernel control chip, has effectively reduced cost, reduces failure rate, for large-scale application is laid a good foundation.
Description of drawings
Fig. 1 is the schematic diagram according to the PON system of prior art;
Fig. 2 is the schematic diagram according to the key optical fibre protection inverting configuration of prior art;
Fig. 3 is the schematic diagram according to the all-fiber protection switching configuration of prior art;
Fig. 4 is the functional block diagram according to PON local side protective circuit of the present invention;
Fig. 5 is the functional block diagram according to PON local side control unit of the present invention;
Fig. 6 is that control flow chart is switched in key fibre circuit protection according to local side of the present invention;
Fig. 7 is according to local side all-fiber protection switching control flow chart of the present invention;
Fig. 8 is according to far-end all-fiber protection switching control flow chart of the present invention;
Fig. 9 is the descending signal timing diagram that sends part of local side;
Figure 10 is the signal timing diagram of the up receiving unit of local side.
Embodiment
At the drawback of two kinds of guard methods of prior art, we have proposed a kind of brand-new a kind of method that realization is protected fibre circuit in EPON (PON), and networking mode still as shown in Figures 2 and 3.Adopt in our method in the OLT side and use the key fibre circuit of the respectively corresponding two-way of two optical modules, the reception of two ways of optical signals and transmission can be opened and closed operation respectively by control.When system works during in key optical fibre protection inverting mode, have only one to send downlink optical signal in two optical modules, also have only wherein one the tunnel can selectedly pass through in the uplink optical signal that two optical modules receive; When system works during in the all-fiber protection switching mode; two optical modules send downlink optical signal simultaneously; the uplink optical signal that two optical modules receive is selected passing through simultaneously also; through one " or " logic module carries out being combined into after the computing and goes signal on the way and send back one-level circuit to and handle; switching the operation of control is finished by far-end ONU side; need active and standby two optical modules on the ONU; the receipts that report according to its optical module do not have light state and select one in two in the active and standby two-way downstream signals that receives, and its upward signal also is correspondingly not have light state according to the receipts of optical module in active and standby two optical modules to select one the tunnel to send equally.Be not difficult to find out that thus the present invention can be applicable to simultaneously that the core concept of key optical fibre protection inverting and these two kinds of typical fibre circuit protected modes of all-fiber protection switching is: the transmission that the local side apparatus of EPON can be controlled active and standby fibre circuit light signal arbitrarily at the transmitter side of downlink optical signal is to open or close; The receiver side of up active and standby fibre circuit light signal can control arbitrarily upward signal be by or end, and then will carry out from the upward signal of active and standby fibre circuit " or " be combined into after the logical operation and go signal on the way and mail to the back level and handle.ONU equipment can be switched without supportive protection when adopting key optical fibre protection inverting mode, and ONU equipment then requires to possess active and standby pair of optical interface and can realize this defencive function when adopting the all-fiber protection switching mode.
The technical problem that solves mainly contains two.
1) PON local side control unit is to the control of optical transceiver module
The PON system that possesses the fibre circuit defencive function has increased a standby optical interface in the local side OLT side, therefore will have two local side optical transceiver modules, these two local side optical transceiver modules just to have two-way light receiving signal and two-way light transmission signal on equipment.When system works during in key optical fibre protection inverting mode; two-way light sends signal and does not allow to export from optical module separately simultaneously; this is because active and standby two optical fiber merge together at first order optical branching device after the local side optical interface comes out; because the impossible just the same length of active and standby optical fiber; light signal has different propagation delay times after transmitting in the two; so cause the serious distortion of signal after the local side transmission light signal of meet different delay is overlapping, so the signal of the two-way light of local side transmission at this moment simultaneously can only have an output.So just need partly effectively control the transmission of local side optical module, this main optical module with fibre circuit just sends and is sent by main optical module with fibre circuit, the optical module transmission of this standby fibre circuit is just sent by the optical module of standby fibre circuit, and the two must not be overlapping on transmitting time.These are controlled after treatment by the state that PON local side control unit does not have light signal according to the receipts of exporting on the primary, spare optical module of primary, spare optical module again.And, then need two-way light to send signal simultaneously from separately optical module output when system works during in the all-fiber protection switching mode.
2) PON local side control unit processing to received signal
The processing to received signal of PON local side control unit must be applicable to key optical fibre protection inverting and these two kinds of fibre circuit protected modes of all-fiber protection switching simultaneously.
In order to solve the problems of the technologies described above; through repetition test, our decision utilizes the protection that moves on the PON local side control unit to switch control module and realizes the transmission shutoff of primary, spare optical module and the alternative circuit of received signal are controlled by the GPIO pin on the control unit.SD (promptly receiving no light signal) signal by GPIO pin input optical transceiver module detects the optical fiber connection status of optical interface, control the transmission cut-off signals of primary, spare optical module and the selection signal of alternative circuit by GPIO pin output high level or low level, as shown in Figure 4.The control interface that the GPIO interface provides for PON local side control unit needs 6 GPIO pins altogether in the design, 2 as importing 4 conduct outputs.Wherein GPIO1 is used for the PON upward signal of gating master with optical transceiver module output, GPIO2 is used for the PON upward signal of the standby optical transceiver module output of gating, GPIO3 is used to control main shutoff with the laser on the optical transceiver module, GPIO4 is used to control the shutoff of the laser on the standby optical transceiver module, GPIO5 is used to detect the master does not have light signal with the receipts of exporting on the optical transceiver module, and GPIO6 is used to detect the receipts of exporting on the standby optical transceiver module does not have light signal.Laser unlatching and luminous when the TX_DIS of optical module is low level in this article, laser shutdown was not luminous when TX_DIS was high level; In case do not receive the light signal that far-end ONU equipment sends on the optical fiber input port of local side optical module, on input (SD) pin of its optical module, can output receive the No Light Alarm signal, represent to receive the unglazed light signal of not receiving when exporting high level usually, optical module is at this moment receives no light state; Representing during output low level to receive has light to receive light signal, and optical module is in to receive at this moment light state.(notice that the high and low level of enumerating just illustrates herein, actual conditions also can have the situation opposite with high and low level in the example to occur, and laser is opened and luminous and then export a low level etc. if can receive light signal when being high level as TX_DIS).
PON local side protective circuit functional block diagram as shown in Figure 4.
Illustrated respectively by these two kinds of different modes of key optical fibre protection inverting and all-fiber protection switching below.
When 1) being operated in key optical fibre protection inverting mode
The PON downstream signal produces the TD pin that the two-way output signal is delivered to primary, spare optical module respectively after by the two-way drive circuit, respectively the Tx_DIS pin of primary, spare optical module is put low level or high level by PON local side control unit by pin GPIO3 and GPIO4 and controls the laser of primary, spare optical module and open luminous or turn-off not luminous.Generally be to allow main the luminous of optical module of using, standby optical module is not luminous, PON local side control unit is at GPIO1 pin output high level simultaneously, by main in the past straight-through by the PON upward signal with the fibre circuit AND logic circuit, in GPIO2 pin output low level, allow the PON upward signal that passes through become low level by standby fibre circuit AND logic circuit, the upward signal that two-way passes through by " or " (promptly main carry out inclusive-OR operation with PON upward signal on the fibre circuit and the PON upward signal that become on the low level standby fibre circuit) obtains after the logic is to lead to give late-class circuit with the PON upward signal on the fibre circuit and handle.After above such control, just realized that working optical fibre line switching with whole PON system is to main with on the fibre circuit.Otherwise will allow the luminous, main not luminous of standby optical module,,, just can realize that working optical fibre line switching with whole PON system is on the standby fibre circuit at GPIO2 pin output high level in GPIO1 pin output low level with optical module.
Tell about the foundation that the PON system switches between active and standby fibre circuit below: usually PON local side control unit can be ceaselessly detects by GPIO5 and GPIO6 pin SD (input) pin to primary, spare optical module, receives no light state to judge whether primary, spare optical module is in.If main being in optical module received no light state, then with the working optical fibre line switching of whole PON system on the standby fibre circuit; Receive no light state if standby optical module is in, then with the working optical fibre line switching of whole PON system to leading with on the fibre circuit; If all being in, primary, spare optical module receives no light state, then with the working optical fibre circuit of whole PON system main use and standby fibre circuit between switch with the very short time interval, up to detect certain optical module be in receive light state is arranged till, also whole PON system is done corresponding switching simultaneously; If primary, spare optical module all is in to receive light state is arranged, the working optical fibre circuit of then whole PON system will remain on this fibre circuit of work at present, not have light state decision systems working optical fibre circuit in the future according to the receipts of optical module simultaneously.
When 2) being operated in the all-fiber protection switching mode
The PON downstream signal produces the TD pin that the two-way output signal is delivered to primary, spare optical module respectively after by the two-way drive circuit, respectively the Tx_DIS pin of primary, spare optical module is put low level or high level by PON local side control unit by pin GPIO3 and GPIO4 and controls the laser of primary, spare optical module and open luminous or turn-off not luminous.Be to make the master all luminous under the all-fiber protection switching mode with optical module and standby optical module; PON local side control unit is all exported high level at GPIO1 and GPIO2 pin simultaneously; in the past straight-through by main AND logic circuit by two-way PON upward signal with fibre circuit and standby fibre circuit, two paths of signals through one " or " logic module carries out being combined into after the computing and goes signal on the way and send back one-level circuit to and handle.
When the all-fiber protection switching mode, the protection switching operation of fibre circuit is finished by far-end ONU equipment.The theory diagram that possesses the ONU equipment of fibre circuit defencive function is the same with the OLT equipment that possesses the fibre circuit defencive function; ONU equipment can ceaselessly be surveyed the master during operate as normal; the receipts of exporting on the standby optical module do not have light signal; received light signal on which optical module just with on the entire equipment in case detect; descending receiving and transmitting signal all receives and sends by this optical module; another optical module then can not be used in the transmitting-receiving; downstream signal; still constantly scanning is main in the ONU system simultaneously; the receipts of exporting on the standby optical module do not have light signal; receive no light signal if detect on the optical module of work at present, then the ONU system can be switched to system the optical module that can detect receiving optical signals immediately and gets on.
In addition, when the attendant need carry out maintenance test to the fibre circuit that is using, at first on network management interface, obtain the working condition of primary, spare optical module, guarantee that the two all is in receipts light state is arranged, then only need be by a Forced Switch order is set on the local side network management interface, just system can be switched to an other fibre circuit from the fibre circuit of work at present, thereby that fibre circuit that easily free time is got off is safeguarded.This mode of operation only is suitable for being operated in the terminal OLT device and the far-end ONU equipment that is operated under the all-fiber protection switching mode under the key optical fibre protection inverting mode.
Fig. 5 is the functional block diagram of PON local side control unit, and the alarm collection processing module will be given protection by the primary, spare optical module receipts No Light Alarm that pin GPIO5 on the PON local side control unit and GPIO6 collect and be switched control module and network management interface module.Protection is switched control module and is utilized pin GPIO3 and GPIO4 on the PON local side control unit that control is opened or turn-offed to the laser of primary, spare optical module according to the alarm amount of receiving; simultaneously also the upward signal from active and standby fibre circuit is carried out control corresponding, thereby finish the protection switch function of the key fibre circuit of whole PON system through pin GPIO1 and GPIO2 on the PON local side control unit.In addition; network management interface module among the figure also is responsible for handling switching instruction from the protection of background net management platform; be used for artificially fibre circuit being switched control, but will note before implementing switching operation, will confirming that primary, spare optical module all is in receipts light state is arranged by network management platform.
Fig. 6 switches control flow chart for the key fibre circuit protection of local side.This flow process is divided into 5 parts: the protection of key fibre circuit switch control module initialization, primary, spare optical module all receive unglazed processing, main with optical module receive processing that unglazed standby optical module is received light, the main receipts with optical module has the standby optical module of light to receive the processing that unglazed processing and primary, spare optical module are all received light.
1. the control module initialization is switched in key fibre circuit protection
When system just starts; module will be carried out initialization operation; create key fibre circuit protection simultaneously and switch control module in passive optical network PON local side control unit, at this moment regardless of the situation on the active and standby fibre circuit, control module all is operated in system's setting main with on the fibre circuit.
2. primary, spare optical module is all received unglazed processing
When primary, spare optical module all is in when receiving no light state, control module will switch to another fibre circuit to system from the fibre circuit of work at present and get on (to get on if i.e. work at present just is switched to standby fibre circuit on leading with fibre circuit; Get on fibre circuit if work at present just is switched to the master on standby fibre circuit), then by continuing the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis after the time-delay control module.
3. the master receives unglazed standby optical module with optical module and receives the processing that light is arranged
When the master receives unglazed standby optical module receipts with optical module there is the light time, control module will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, then by continuing the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis after the time-delay control module.
4. main the receipts with optical module has the standby optical module of light to receive unglazed processing
Receive unglazed master when standby optical module and arranged the light time with the optical module receipts, control module will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, then by continuing the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis after the time-delay control module.
5. primary, spare optical module is all received the processing of light
When all being in, receives when light state is arranged primary, spare optical module, control module will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
6. time-delay control
Because being the TDMA mode that adopts, transmits the upward signal of PON, all remote equipments all will decide the transmission timing of upward signal with reference to the synchronous timing information in the downstream signal, then upward signal also disappears when descending blackout, only just upward signal might be arranged when downstream signal.So when when local side carries out switching operation, when just having finished the fibre circuit switching is can not receive light signal at once, the duration that generally will postpone a Millisecond can correctly receive to receive light signal, has therefore increased a time-delay control module in the module flow process.
Fig. 7 is a local side all-fiber protection switching control flow chart.After in passive optical network PON local side control unit, finishing the establishment of this control module, control module will allow two optical modules send downlink optical signal simultaneously, the uplink optical signal that two optical modules receive is selected passing through simultaneously also, through one " or " logic module carries out being combined into after the computing and goes signal on the way and send back one-level circuit to and handle, switch the operation of control and finished by far-end ONU side.
Fig. 8 is a far-end all-fiber protection switching control flow chart.This flow process is divided into 5 parts: full fibre circuit protection switch control module initialization, primary, spare optical module all receive unglazed processing, main with optical module receive processing that unglazed standby optical module is received light, the main receipts with optical module has the standby optical module of light to receive the processing that unglazed processing and primary, spare optical module are all received light.
1. the control module initialization is switched in full fibre circuit protection
When system just starts; module will be carried out initialization operation; create full fibre circuit protection simultaneously and switch control module in passive optical network PON local side control unit, at this moment regardless of the situation on the active and standby fibre circuit, control module all is operated in system's setting main with on the fibre circuit.
2. primary, spare optical module is all received unglazed processing
When primary, spare optical module all is in the no light state of receipts, control module can ceaselessly be surveyed the receipts of exporting on the primary, spare optical module does not have light signal, has received light signal on which optical module and just entire equipment is switched to corresponding that fibre circuit and get in case detect.
3. the master receives unglazed standby optical module with optical module and receives the processing that light is arranged
Receive unglazed standby optical module with optical module and receive the light time is arranged when main, control module will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, and continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis.
4. main the receipts with optical module has the standby optical module of light to receive unglazed processing
Receive unglazed master when standby optical module and receive with optical module the light time is arranged, control module will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis.
5. primary, spare optical module is all received the processing of light
When all being in, receives when light state is arranged primary, spare optical module, control module will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
Fig. 9 is the descending signal sequence schematic diagram that sends part of local side OLT.As can be seen from the figure, when being high level on GPIO3 and the GPIO4, all there is not light signal output on the active and standby fibre circuit; When being low level on GPIO3 and the GPIO4, light signal output is arranged all on the active and standby fibre circuit.
Figure 10 is the signal sequence schematic diagram of the up receiving unit of local side OLT.As can be seen from the figure, when GPIO1 and GPIO2 go up to low level, the upward signal that receives from active and standby fibre circuit all be under an embargo by; When being high level on GPIO1 and the GPIO2, the upward signal that receives from active and standby fibre circuit all can pass through unblockedly.
In the specific implementation we to select 32 bit CPU processors be master cpu, and 6 GPIO pins on the CPU are set to state control signal pin and alarm collection signal pin.Select for use 1: 2 differential driving chip of a slice to be used for converting the descending LVPECL level signal of one road PON to 2 road LVPECL level signals and export active and standby optical transceiver module respectively to.Master cpu is put low level or high level to the Tx_DIS pin of primary, spare optical module respectively by pin GPIO3 and GPIO4 and is controlled the laser of primary, spare optical module and open luminous or turn-off not luminous.GPIO5 and GPIO6 pin then are used for SD (input) pin of primary, spare optical module is detected by master cpu, receive no light state to judge whether primary, spare optical module is in.By one among Fig. 4 based on two of the LVPECL level signal combinational logic arrays with Men Jiayi or door, master cpu can be easily with the high-low level of GPIO1 and GPIO2 select to allow main with on the fibre circuit or standby fibre circuit on the PON upward signal pass through, or even the two all passes through.
In conjunction with the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not restricted to the foregoing description, under the spirit and scope situation of the claim that does not break away from the application, those skilled in the art can make various modifications or remodeling.
Claims (9)
1, a kind of device that realization is protected fibre circuit in EPON is characterized in that comprising:
The master uses the fibre circuit optical transceiver module, is used for main with the opto-electronic conversion on the fibre circuit;
Standby fibre circuit optical transceiver module is used for the opto-electronic conversion on the standby fibre circuit;
Passive optical network PON local side control unit, link to each other with the combinational logic array with the fibre circuit optical transceiver module with active and standby, whether it is luminous or not luminous can controlling primary, spare optical module according to switching strategy, simultaneously also can by allow the upward signal on the primary, spare fibre circuit pass through smoothly to the control of combinational logic array decision;
Main with fibre circuit and logic, when PON local side control unit during, make the PON upward signal in the past straight-through to its input high level; When to its input low level, allow the PON upward signal that passes through become low level;
Standby fibre circuit and logic when PON local side control unit during to its input high level, make the PON upward signal in the past straight-through; When to its input low level, allow the PON upward signal that passes through become low level;
Or logic, the upward signal that two-way is passed through carries out or logical operation is gone signal on the way and sent back one-level circuit to and handle to be combined into.
2, device according to claim 1 is characterized in that:
PON local side control unit is to the master, the receipts of exporting on the standby optical module do not have light signal and detect, to judge the master, whether standby optical module is in is received no light state, when being operated in key optical fibre protection inverting mode, if main being in optical module received no light state, then with the working optical fibre line switching of whole PON system on the standby fibre circuit, allow when descending main not luminous with optical module, standby optical module is luminous, PON local side control unit becomes low level with fibre circuit and logical circuit by the PON upward signal by main simultaneously, make the PON upward signal that passes through in the past straight-through by standby fibre circuit and logical circuit, with the working optical fibre line switching of whole PON system on the standby fibre circuit; If being in, standby optical module receives no light state, then with the working optical fibre line switching of whole PON system to main with on the fibre circuit, allow when descending main not luminous with luminous, the standby optical module of optical module, PON local side control unit is by main in the past straight-through by the PON upward signal with fibre circuit and logical circuit simultaneously, allow the PON upward signal that passes through become low level by standby fibre circuit and logical circuit, with the working optical fibre line switching of whole PON system to main with on the fibre circuit; If all being in, primary, spare optical module receives no light state, then with the working optical fibre circuit of whole PON system main use and standby fibre circuit between switch with the very short time interval, up to detect certain optical module be in receive light state is arranged till, also whole PON system is done corresponding switching simultaneously; If primary, spare optical module all is in to receive light state is arranged, the working optical fibre circuit of then whole PON system will remain on this fibre circuit of work at present, not have light state decision systems working optical fibre circuit in the future according to the receipts of optical module simultaneously;
When being operated in local side all-fiber protection switching mode, system is operated in main with fibre circuit and standby fibre circuit simultaneously.
3, device according to claim 2 is characterized in that:
When being operated in far-end all-fiber protection switching mode; the protection switching operation of fibre circuit is finished by far-end ONU equipment; ONU equipment is ceaselessly surveyed the master; the receipts of exporting on the standby optical module do not have light signal; received light signal on which optical module just with on the entire equipment in case detect; descending receiving and transmitting signal all receives and sends by this optical module; another optical module then can not be used in the transmitting-receiving; downstream signal; still constantly scanning is main in the ONU system simultaneously; the receipts of exporting on the standby optical module do not have light signal; receive no light signal if detect on the optical module of work at present, then the ONU system can be switched to system the optical module that can detect receiving optical signals immediately and gets on.
4,, it is characterized in that PON local side control unit further comprises according to any one described device of claim 1 to 3:
The alarm collection processing module is given protection with the primary, spare optical module receipts No Light Alarm that collects and is switched control module and network management interface module;
Control module is switched in protection, it opens or turn-offs control according to the alarm of receiving to the laser of primary, spare optical module, simultaneously also the upward signal from active and standby fibre circuit is carried out control corresponding, thereby finish the protection switch function of the key fibre circuit of whole PON system;
The network management interface module, instruction is switched in the protection that is used to handle from the background net management platform, is used for artificially fibre circuit being switched control.
5, a kind of method that realization is protected fibre circuit in EPON is characterized in that:
The control module initialization is switched in the key fibre circuit protection of step (1), system's setting is operated in main with on the fibre circuit;
When step (2) all is in the no light state of receipts when primary, spare optical module, passive optical network PON local side control unit will switch to another fibre circuit to system from the fibre circuit of work at present and get on, and continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then;
Step (3) has the light time when the master receives unglazed standby optical module receipts with optical module, passive optical network PON local side control unit will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, and continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then;
Step (4) is received unglazed master when standby optical module has the light time with the optical module receipts, passive optical network PON local side control unit will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, continues the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis by control module after the time-delay then;
Step (5) is received when light state is arranged when primary, spare optical module all is in, passive optical network PON local side control unit will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
6, method according to claim 5 is characterized in that:
When local side all-fiber protection switching mode; passive optical network PON local side control unit will allow two optical modules send downlink optical signal simultaneously; the uplink optical signal that two optical modules receive is selected passing through simultaneously also; carry out being combined into after the computing through one or logic module and go signal on the way and send back one-level circuit to and handle, switch the operation of control and finish by far-end ONU side.
7, method according to claim 5 is characterized in that:
Switching to standby fibre circuit from the fibre circuit of work at present described in the step (3) gets on and further comprises: allow standby optical module luminous, main not luminous with optical module when descending, PON local side control unit becomes low level with fibre circuit and logical circuit by the PON upward signal by main simultaneously, allows the straight-through past of PON upward signal of passing through by standby fibre circuit and logical circuit.
8, method according to claim 5 is characterized in that:
Described in the step (4) from the fibre circuit of work at present switch to main get on fibre circuit further comprise: allow main not luminous when descending with luminous, the standby optical module of optical module, PON local side control unit allows the PON upward signal that passes through become low level by main in the past straight-through by the PON upward signal with fibre circuit and logical circuit by standby fibre circuit and logical circuit simultaneously.
9, a kind of method that realization is protected fibre circuit in EPON is characterized in that:
The control module initialization is switched in the full fibre circuit protection of step (a) far-end, at this moment regardless of the situation on the active and standby fibre circuit, all system's setting is operated in main with on the fibre circuit;
When step (b) all is in the no light state of receipts when primary, spare optical module, passive optical network PON local side control unit can ceaselessly be surveyed the receipts of exporting on the primary, spare optical module does not have light signal, has received light signal on which optical module and just entire equipment is switched to corresponding that fibre circuit and get in case detect;
Step (c) has the light time when the master receives unglazed standby optical module receipts with optical module, passive optical network PON local side control unit will switch to standby fibre circuit to system from the fibre circuit of work at present and get on, and continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis;
Step (d) is received unglazed master when standby optical module has the light time with the optical module receipts, passive optical network PON local side control unit will switch to system mainly to get on fibre circuit from the fibre circuit of work at present, continues then the receipts No Light Alarm on the primary, spare optical module is carried out discriminatory analysis;
Step (e) is received when light state is arranged when primary, spare optical module all is in, passive optical network PON local side control unit will keep the fibre circuit of system's work at present, receive the instruction of switching then, switch instruction and select to switch to which bar fibre circuit and get on according to what webmaster was assigned from the network management interface module.
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| CNB2007100006351A CN100539475C (en) | 2007-01-11 | 2007-01-11 | A kind of devices and methods therefor of in EPON, fibre circuit being protected |
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| CNB2007100006351A CN100539475C (en) | 2007-01-11 | 2007-01-11 | A kind of devices and methods therefor of in EPON, fibre circuit being protected |
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| CN100539475C true CN100539475C (en) | 2009-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101222350B (en) * | 2007-01-12 | 2011-08-24 | 华为技术有限公司 | Protection switching decision method and system |
| CN101399614B (en) | 2007-09-26 | 2012-10-03 | 华为技术有限公司 | Protection method, system and device for long distance passive optical network |
| CN101414878B (en) * | 2008-12-03 | 2011-07-20 | 烽火通信科技股份有限公司 | Method and apparatus for implementing trunk optical fiber rapid protection switching of EPON system |
| CN101540638B (en) * | 2009-05-06 | 2011-12-21 | 烽火通信科技股份有限公司 | inter-board protection switching method of TDM service channel in EPON system |
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| CN112039582B (en) * | 2020-09-03 | 2022-04-01 | 南京捷澳德信息科技有限公司 | System and method for optical module expansion supporting optical communication link protection switching application |
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Assignee: Wuhan beacon International Technology Co., Ltd. Assignor: Fenghuo Communication Science &. Technology Co., Ltd. Contract record no.: 2011420000044 Denomination of invention: A protection device for the optical fiber line in the passive optical network and its method Granted publication date: 20090909 License type: Exclusive License Open date: 20070801 Record date: 20110411 |