CN103414962A - Large-scale user access oriented LR-PON layout planning method - Google Patents
Large-scale user access oriented LR-PON layout planning method Download PDFInfo
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Abstract
The invention discloses a large-scale user access oriented LR-PON layout planning method. In an LR-PON, a multi-order optical amplifier is brought in to carry out power compensation on an optical signal, so optical network coverage in a remoter distance and a larger range can be achieved. Network cost minimization serves as the purpose, connectedness of the whole network is guaranteed, and meanwhile, optical fiber coverage is carried out on the basis of an optical network unit, a plurality of candidate optical amplifiers and a plurality of candidate optical splitters. Compared with a traditional PON deployment method, the LR-PON layout planning method is oriented to large-scale user access; a three-stage cascade connection mode is adopted in a framework, a topological structure is ought to have good extendibility and space flexibility, therefore, more users are allowed to have access to the network, and the scale and the coverage range of the network are greatly expanded. Compared with a traditional mathematical modeling prioritization scheme, the LR-PON layout planning method reduces time complexity of calculation, therefore, greatly improves efficiency of engineering calculation, and effectively shortens calculation time.
Description
Technical field
The invention belongs to the Networks of Fiber Communications field, relate to long distance passive optical-fiber network (LR-PON) coverage planning problem, address the quick heuristic search method for solving of LR-PON topology optimization, solve the allocation plan problem that the LR-PON fast and flexible is disposed.
Background technology
Long distance passive optical-fiber network (Long Reach Passive Optical Network, LR-PON), as PON technology of future generation, the transmission range of conventional P ON is extended to 100km by 20km, it is integrated into a system by optical access network and metropolitan area network, can support more massive user's access and more remote optical-fiber network to cover.Due to the impact of the electromagnetic interference of effectively having avoided external equipment and thunder and lightning, it reduced circuit and and the failure rate of external equipment, improved system reliability, make networking speed fast, saved the lower deployment cost of actual light network.Therefore the LR-PON network is as a kind of broadband access optical fiber technology of emerging last kilometer of covering, provides reliable technical support for realizing that " light entering and copper back " " Fiber to the home " and following extensive fixedly cloud computing user access etc.
In actual passive optical network field, optical network unit ONU (Optical Network Unit, ONU) be the terminal equipment of optical fiber access, it and optical line terminal OLT (Optical Line Terminal, OLT) be used in conjunction with, the OLT operated by rotary motion is in machine room, and ONU is according to actual living needs setting within the family or in corridor.
In prior art about the network-building method of PON, just be directed to respectively Optical Fiber Transmission or network capacity is carried out independently modeling analysis, can't guarantee in remote large-scale consumer optical fiber access, effectively increase the coverage of network and the capacity of optical network unit ONU, take into account transmission range and network size, the also loss that causes of compensating signal effectively when the multi-user zone is served at a distance in transmitting procedure.On the other hand, prior art is generally by Optimization Software, to be optimized after adopting modeling, the engineering information treating capacity is large, computational complexity increases and is exponential growth trend with network size, therefore computer hardware is required harshly, engineering solves the time can not be estimated, and adopts modeling and mechanical prioritization scheme, optimum results often can not combine with actual conditions, and theory and practice has deviation.
Summary of the invention
Problem according to prior art exists, the invention discloses a kind of light of long distance passive towards large-scale access net (LR-PON) method of allocation plan, comprises the steps:
Step 1: initialization: set a plurality of optical network units, a plurality of candidate's image intensifer and a plurality of candidate's optical splitter and it is carried out to serial number in target area, according to the actual longitude and latitude position of optical network unit, candidate's image intensifer and candidate's optical splitter, take optical line terminal and set up two-dimensional coordinate figure as initial point, and calculate the distance between optical network unit, candidate's image intensifer and candidate's optical splitter three, and by this distance value storage;
Step 2: realize three rank optical splitter cascades: candidate's optical splitter that optical network unit and its is nearest is connected, and above-mentioned candidate's optical splitter is defined as to the single order optical splitter; With square area, optical network unit being carried out to minimum covers fully, as network's coverage area, the geometric center of choosing network's coverage area is initial point, / 4th of a network's coverage area length of side of take is set up central area as initial radium, by in the single order optical splitter outside central area and central area, be connected with its nearest candidate's optical splitter, and above-mentioned candidate's optical splitter is defined as to the second order optical splitter; Calculate the mean value of above-mentioned whole second order optical splitter coordinates, choose apart from the nearest candidate's optical splitter of this mean value coordinates as three rank optical splitters, the second order optical splitter is connected with three rank optical splitters;
Step 3: realize the cascade of second order image intensifer: from the light network termination, select under the condition that meets image intensifer minimum spacing threshold value apart from the nearest candidate's image intensifer of light network termination as the single order image intensifer; Meet under the condition of image intensifer minimum spacing threshold value, select apart from single order image intensifer and three rank optical splitter distances and minimum candidate's image intensifer as the second order image intensifer, and the second order image intensifer is connected with three rank optical splitters;
Step 4: calculate link loss value, judge whether to add image intensifer: the discharging chain way of adding up each rank optical splitter, calculate every by optical network unit to light network termination link transmission loss value, if loss value is greater than the highest loss threshold value of setting, between second order optical splitter and three rank optical splitters, search apart from the two distance and minimum candidate's image intensifer, and this candidate's image intensifer is connected with three rank optical splitters with the second order optical splitter respectively; If loss value is less than this threshold value, without increasing image intensifer;
Step 5: the programme of output passive optical network (LR-PON) layout: the optical network unit in target area, each rank image intensifer of choosing and each rank optical splitter and corresponding network thereof are connected in two-dimensional coordinate to the sign of drawing; Export respectively each by distance value and the loss value of optical network unit to light network termination link; Output network is disposed total cost and program runtime, the two-dimensional coordinate network connection scheme of output is set as to the allocation plan scheme of this LR-PON.
In step 2: after candidate's optical splitter that optical network unit and its is nearest is connected, if the discharging chain way of this candidate's optical splitter is less than the minimum discharging chain way threshold value of single order optical splitter, connected optical network unit is carried out to the sub-optimal path selection, the single order optical splitter that described optical network unit and its is nearest is connected.
In step 2: by the single order optical splitter outside central area and central area with after its nearest candidate's optical splitter is connected, if the discharging chain way of this candidate's optical splitter is less than the minimum discharging chain way threshold value of second order optical splitter, connected single order optical splitter is carried out to the sub-optimal path selection, the second order optical splitter that described single order optical splitter and its is nearest is connected.
The minimum discharging chain way threshold value of described single order optical splitter is different from the minimum discharging chain way threshold value of described second order optical splitter.
In step 3: image intensifer spacing threshold value is set according to the actual conditions of network design.
Beneficial effect of the present invention is as follows:
1. with traditional PON network-building method, compare, owing in the PON framework, there is no image intensifer, and the multistage cascade system of employing optical splitter in the network architecture of this programme, topological structure should be with good expansibility and space flexibility, therefore the addressing of multistage image intensifer is also included in the allocation plan consideration of this programme, thereby allow more user to be linked in network, expanded greatly scale and the coverage of network;
2. a kind of light of long distance passive towards large-scale access net provided by the invention (LR-PON) method of allocation plan, relative traditional mathematics modeling optimization scheme, reduced the complexity of computing, effectively shortened operation time, thereby greatly improved the efficiency of engineering calculation, especially solve conventional method and relied on the optimization tool difficult problem that deployment is difficult to solve for large scale network, be particularly suitable for the scene of large-scale access; And result of calculation is compared with the optimal solution that Optimization Software obtains, and this method can obtain suboptimal solution fast and effectively.
Therefore, adopt method of the present invention can obtain fast its rational allocation plan scheme for large-scale access long distance passive light net.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of the present invention towards long distance passive light net (LR-PON) method of allocation plan of large-scale access.
Fig. 2 is the schematic diagram of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the embodiment of the present invention.
Fig. 4 is the schematic diagram of the embodiment of the present invention.
Fig. 5 is the schematic diagram of the embodiment of the present invention.
Fig. 6 is the schematic diagram of the embodiment of the present invention.
Embodiment
For making technical scheme of the present invention and advantage clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is known to complete description:
Below the vocabulary of terms that occurs in the present invention and the special title in accompanying drawing are illustrated.In figure:
Single order optical splitter Splitter: refer to the optical splitter directly be connected with optical network unit ONU;
Second order optical splitter: refer to the optical splitter directly be connected with the single order optical splitter;
Three rank optical splitters: refer to the optical splitter be connected with the second order optical splitter;
Single order image intensifer: refer to the image intensifer be connected with OLT;
Second order image intensifer: refer to the image intensifer be connected with three rank optical splitters;
Network's coverage area: with square area, optical network unit is carried out to minimum and cover resulting zone fully;
Central area: for realizing the candidate region location of two, three rank optical splitter Splitter, the geometric center of network's coverage area of take is initial point, and 1/4th of the network's coverage area length of side is set up border circular areas for initial radium;
Embodiment:
As shown in Figure 1: the LRPON method of allocation plan has following steps:
Step 1: initialization: at first by actual exploration selected target zone, in target area, set a plurality of optical network units, a plurality of candidate's image intensifer OA and a plurality of candidate's optical splitter Splitter, actual longitude and latitude according to its position, the optical line terminal OLT of take is set up two-dimensional coordinate figure as initial point, and now optical network unit ONU, a plurality of candidate's image intensifer OA and a plurality of candidate's optical splitter Splitter fall in this two-dimensional coordinate figure according to its actual longitude and latitude position.Press the rear number consecutively of the unified arrangement of order of light network termination OLT, candidate's image intensifer OA, the last optical network unit ONU of candidate's optical splitter Splitter, and calculate respectively in two-dimensional coordinate figure between optical network unit ONU, candidate's optical splitter and candidate's image intensifer OA three distance value in twos, and this distance value is stored.According to the actual deployment scene, set the allocation plan parameter, comprising: the minimum discharging chain way threshold value of the minimum discharging chain way of single order optical splitter threshold value, second order optical splitter, optical splitter be transmission range threshold value, image intensifer minimum spacing threshold value, image intensifer transmission range threshold value and greatest path loss threshold value farthest farthest.
Step 2: realize three rank optical splitter cascades, candidate's optical splitter that optical network unit ONU and its is nearest is connected, after connection, check the discharging chain way of the optical splitter that these are connected by optical network unit ONU, the optical splitter that is greater than the minimum discharging chain way threshold value of single order optical splitter is defined as to the single order optical splitter; If the discharging chain way of the above-mentioned optical splitter connected by optical network unit ONU is less than the minimum discharging chain way threshold value of single order optical splitter, connected optical network unit ONU is disconnected, these optical network unit ONU are connected with the single order optical splitter that meets the output link said conditions.According to shortest distance principle, the optical network unit ONU that is about to above-mentioned disconnection is connected with its nearest single order optical splitter.Reached the result of optical network unit ONU being carried out to the sub-optimal path selection.Candidate's optical splitter that method as above is finally selected is defined as the single order optical splitter.As shown in Figures 2 and 3, image intensifer set P
OA={ P
OA1, P
OA2 ... P
OA6}, optical splitter set P
SP={ P
SP1, P
SP2 ... P
SP15}, optical network unit set P
ONU={ P
ONU1, P
ONU2 ... P
ONU20}.All optical network unit ONU are connected to P according to shortest distance principle
SP1, P
SP7, P
SP8, P
SP9, P
SP10 and P
SP14.But after the data analysis judgement, P
SP1, P
SP9 and P
SPThe discharging chain way of 14 these three candidate's optical splitters is less than the minimum discharging chain way of single order optical splitter, therefore by P
SP1, P
SP9 and P
SPThe optical network unit ONU connected on 14 these three candidate's single order optical splitters is connected on other single order optical splitters, and selects to be connected with the single order optical splitter of its minimum distance.As shown in Figure 2: by these three candidate's single order optical splitter P
SP1, P
SP9 and P
SPThe optical network unit ONU connected on 14 is connected to the P nearest with it
SP7, P
SP8 and P
SP10, and by P
SP7, P
SP8 and P
SP10 are made as the single order optical splitter.
The geometric center of network's coverage area of take is initial point, and 1/4th of the network's coverage area length of side is set up central area for initial radium; According to shortest distance principle, the single order optical splitter outside this central area is connected with the candidate's optical splitter in central area.If the discharging chain way of the candidate's optical splitter be connected is less than the minimum discharging chain way threshold value of second order optical splitter, above-mentioned single order optical splitter is carried out to the sub-optimal path selection, be about to the single order optical splitter and be connected with its nearest candidate's optical splitter, the above-mentioned optical splitter be connected is defined as to the second order optical splitter.As shown in Figure 4 and Figure 5, the geometric center of network's coverage area of take is initial point, the network's coverage area length of side 1/4th for after initial radium sets up central area, by single order optical splitter P
SP7 are connected to P nearest in central area
SP5, P
SP8 and P
SP10 are connected to nearest P
SP15, then judge P
SP5 and P
SPWhether the discharging chain way of 15 these two candidate's optical splitters is greater than the minimum discharging chain way threshold value of second order optical splitter, due to P
SP5 outgoing route number is less than the minimum discharging chain way threshold value of second order optical splitter, to P
SPThe single order optical splitter P connected on 5
SP7 carry out the sub-optimal path selection, by P
SP7 are connected to the P nearest with it
SPOn 15, and by P
SP15 are defined as the second order optical splitter.
Calculate the mean value of the coordinate of above-mentioned selected second order optical splitter, the coordinate figure that namely calculates all second order optical splitter coordinates obtains mean value, choose apart from the nearest candidate's optical splitter of this mean value coordinates as three rank optical splitters, the second order optical splitter is connected with three rank optical splitters.Through above-mentioned connection, the single order optical splitter is connected with the second order optical splitter, the second order optical splitter is connected with three rank optical splitters, finally formation by mind-set surrounding three classes of dispersing join optical splitter formation.Three rank cascade structures can enlarge network size on the one hand, are easy on the other hand realize a little to be with good expansibility and space flexibility to the expansion connection of multiple spot.
As shown in Figure 6, in the present embodiment, P
SPThe mean value of 15 coordinates is himself coordinate, therefore its nearest P of chosen distance
SP4 is three rank optical splitters.
Step 3: realize the cascade of second order image intensifer.From light network termination OLT, satisfied, select the candidate image intensifer OA nearest with light network termination OLT as the single order image intensifer under the condition of image intensifer OA distance value, as shown in Figure 6, according to actual requirement, the distance value of setting from light network termination OLT to image intensifer OA, satisfied, be greater than under the condition of this distance value, light network termination OLT is connected with its nearest image intensifer OA, and using this image intensifer OA as the single order image intensifer.According to actual requirement, set under the minimum spacing threshold value prerequisite between image intensifer OA, selection, and is connected the second order image intensifer as the second order image intensifer apart from single order image intensifer and three rank optical splitter distances and minimum candidate's image intensifer OA with three rank optical splitters.In Fig. 6, from OLT, select to be greater than predefined OLT-OA minimum range (as 20 kilometers) and the P nearest with OLT apart from the distance of OLT
OA3 as the single order image intensifer, meets under the prerequisite of the distance values between the image intensifer of setting according to actual requirement, selects apart from P
OA3(single order image intensifer) and P
SP4(tri-rank optical splitters) distance and minimum candidate's image intensifer OA be as the second order image intensifer, and by P
OA2 are connected with three rank optical splitters, i.e. P
OA2 and P
SP4 connect.
Step 4: calculate link loss value, judge whether to add image intensifer: the discharging chain way of adding up each rank optical splitter, calculate every by the loss value of optical network unit to light network termination link, if loss value is greater than the highest loss threshold value of setting, between second order optical splitter and three rank optical splitters, search apart from second order optical splitter and three rank optical splitter distances and minimum candidate's image intensifer, and this candidate's image intensifer is connected with three rank optical splitters with the second order optical splitter respectively; If loss value is less than the highest loss threshold value, without increasing image intensifer; For example, through calculating light network termination OLT to the loss value of the output link signal of optical network unit ONU, if this loss value is greater than the highest loss threshold value, can be at P
SP4 and P
SPBetween 15, select candidate's image intensifer OA.If being less than the highest loss threshold value, this loss value do not need to add candidate's image intensifer OA.
Step 5: the programme of output passive optical network (LR-PON) layout: the numbering of the output link scheme in the statistics target area and corresponding optical network unit, each rank image intensifer and each rank optical splitter; Every by distance value and loss value and the program runtime of optical network unit to light network termination link, and the output link design of scheme counted is to this passive optical network path planning scheme.
For large-scale LRPON dispositions method, adopt traditional Optimization Software usually to be difficult to solve, perhaps namely allow to solve consuming time long, and adopt method efficiency provided by the invention to be significantly improved, and result of calculation is compared with the Optimization Software optimum results, the two gap within the acceptable range, namely can obtain suboptimal solution.As shown in Table 1, table one is the test data of small scale network programme to comparing result, and the traditional scheme of contrast all adopts famous Gurobi integer linear Optimization Software to solve here.Can find out the network planning scheme of utilizing the present invention to obtain, the theoretical optimal solution that its network design cost obtains with respect to traditional modeling optimization, the two gap is within 10%, and the number of image intensifer OA and optical splitter splitter final choice and theoretical optimal case approach; And, from scheme angle analysis computing time, can find out that obtained shortening greatly the running time of technical scheme disclosed by the invention with respect to traditional modeling optimization scheme, and along with network size constantly enlarges, what this advantage was more outstanding displays.For reducing currency conversion, in table, gcu is general cost-element (generic cost unit), is the uniform cost unit of calculating and relatively setting for the simplified network lower deployment cost in example of the present invention.
Table one:
Table two demonstration, when enlarging network size, traditional modeling optimization scheme has been difficult to solve, and has following reason:
1. the expansion of network size, make the quantity of variable and constraints in model be exponential growth;
2. too high to the configuration requirement of computer hardware, especially need enough large memory headroom to guarantee Optimization Software operation calculating;
3. the model calculation complexity, exceed acceptable time range running time;
And now technical scheme disclosed by the invention still can be tried to achieve the allocation plan scheme fast.Because the traditional modeling optimization of large scale network can't direct solution, therefore select the present invention program with traditional scheme, to combine the pattern of use, namely first by the result after the present invention program's rapid Optimum as initial solution, the recycling traditional scheme is further optimized the approximate theoretical optimal value of trying to achieve, and the result that itself and the present invention program are independently solved is compared, can find out clearly, the network design cost still can remain in acceptable cost budgeting scope, and absolute advantage there isd the running time of this programme, thereby can within the shortest time, provide feasible high-quality scheme to extensive long distance passive optical network plan.Comparing result is as shown in Table 2:
Table two:
LRPON method of allocation plan disclosed by the invention can be in the situation that guarantee that trying to achieve the suboptimal solution computational efficiency significantly improves, solve conventional method and relied on the optimization tool difficult problem that deployment is difficult to solve for large scale network, be particularly suitable for the scene of large-scale consumer optical fiber access, this LRPON allocation plan scheme has that long distance covers, extensive, the characteristics of supporting two-forty, reliable access.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (5)
1. the light of the long distance passive towards a large-scale access net (LR-PON) method of allocation plan, cover for the Optical Access Network network in the realize target zone, and it is characterized in that: the method comprises the following steps:
Step 1: initialization: set a plurality of optical network units, a plurality of candidate's image intensifer and a plurality of candidate's optical splitter and it is carried out to serial number in target area, according to the actual longitude and latitude position of optical network unit, candidate's image intensifer and candidate's optical splitter, take optical line terminal and set up two-dimensional coordinate figure as initial point, and calculate the distance between optical network unit, candidate's image intensifer and candidate's optical splitter three, and by this distance value storage;
Step 2: realize three rank optical splitter cascades: candidate's optical splitter that optical network unit and its is nearest is connected, and above-mentioned candidate's optical splitter is defined as to the single order optical splitter; With square area, optical network unit being carried out to minimum covers fully, as network's coverage area, the geometric center of choosing network's coverage area is initial point, / 4th of a network's coverage area length of side of take is set up central area as initial radium, by in the single order optical splitter outside central area and central area, be connected with its nearest candidate's optical splitter, and above-mentioned candidate's optical splitter is defined as to the second order optical splitter; Calculate the mean value of above-mentioned whole second order optical splitter coordinates, choose apart from the nearest candidate's optical splitter of this mean value coordinates as three rank optical splitters, the second order optical splitter is connected with three rank optical splitters;
Step 3: realize the cascade of second order image intensifer: from the light network termination, select under the condition that meets image intensifer minimum spacing threshold value apart from the nearest candidate's image intensifer of light network termination as the single order image intensifer; Meet under the condition of image intensifer minimum spacing threshold value, select apart from single order image intensifer and three rank optical splitter distances and minimum candidate's image intensifer as the second order image intensifer, and the second order image intensifer is connected with three rank optical splitters;
Step 4: calculate link loss value, judge whether to add image intensifer: the discharging chain way of adding up each rank optical splitter, calculate every by optical network unit to light network termination link transmission loss value, if loss value is greater than the highest loss threshold value of setting, between second order optical splitter and three rank optical splitters, search apart from the two distance and minimum candidate's image intensifer, and this candidate's image intensifer is connected with three rank optical splitters with the second order optical splitter respectively; If loss value is less than this threshold value, without increasing image intensifer;
Step 5: the programme of output passive optical network (LR-PON) layout: the optical network unit in target area, each rank image intensifer of choosing and each rank optical splitter and corresponding network thereof are connected in two-dimensional coordinate to the sign of drawing; Export respectively each by distance value and the loss value of optical network unit to light network termination link; Output network is disposed total cost and program runtime, the two-dimensional coordinate network connection scheme of output is set as to the allocation plan scheme of this LR-PON.
2. a kind of light of long distance passive towards large-scale access net according to claim 1 (LR-PON) method of allocation plan, be further characterized in that: in step 2: after candidate's optical splitter that optical network unit and its is nearest is connected, if the discharging chain way of this candidate's optical splitter is less than the minimum discharging chain way threshold value of single order optical splitter, connected optical network unit is carried out to the sub-optimal path selection, the single order optical splitter that described optical network unit and its is nearest is connected.
3. a kind of light of long distance passive towards large-scale access net according to claim 1 (LR-PON) method of allocation plan, be further characterized in that: in step 2: by the single order optical splitter outside central area and central area with after its nearest candidate's optical splitter is connected, if the discharging chain way of this candidate's optical splitter is less than the minimum discharging chain way threshold value of second order optical splitter, connected single order optical splitter is carried out to the sub-optimal path selection, the second order optical splitter that described single order optical splitter and its is nearest is connected.
4. a kind of light of long distance passive towards large-scale access net according to claim 1 (LR-PON) method of allocation plan, be further characterized in that: the minimum discharging chain way threshold value of described single order optical splitter is different from the minimum discharging chain way threshold value of described second order optical splitter.
5. a kind of light of long distance passive towards large-scale access net according to claim 1 (LR-PON) method of allocation plan is further characterized in that: in step 3: image intensifer spacing threshold value is set according to the actual conditions of network design.
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| CN104348668A (en) * | 2014-11-26 | 2015-02-11 | 国家电网公司 | Double-tree reliable passive optical network (PON) planning method based on fast approximate non-iteration |
| CN104348668B (en) * | 2014-11-26 | 2018-05-04 | 国家电网公司 | One kind is based on quick nearly non-iterative double tree-like reliable PON planing methods |
| CN113965834A (en) * | 2020-07-20 | 2022-01-21 | ***通信集团安徽有限公司 | Problem detection method and device for optical distribution network |
| CN113965834B (en) * | 2020-07-20 | 2023-09-19 | ***通信集团安徽有限公司 | Method and device for detecting problems of optical distribution network |
| CN114584472A (en) * | 2020-11-30 | 2022-06-03 | 中移(苏州)软件技术有限公司 | Method, device, electronic equipment and medium for determining connectivity of optical splitter |
| CN114584472B (en) * | 2020-11-30 | 2023-11-03 | 中移(苏州)软件技术有限公司 | Method, device, electronic equipment and medium for determining connectivity of optical splitter |
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| CN103414962B (en) | 2016-07-06 |
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