CN201044449Y - Optical transmitter-receiver and network management system of optical transmitter-receiver - Google Patents
Optical transmitter-receiver and network management system of optical transmitter-receiver Download PDFInfo
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- CN201044449Y CN201044449Y CNU2007200025470U CN200720002547U CN201044449Y CN 201044449 Y CN201044449 Y CN 201044449Y CN U2007200025470 U CNU2007200025470 U CN U2007200025470U CN 200720002547 U CN200720002547 U CN 200720002547U CN 201044449 Y CN201044449 Y CN 201044449Y
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Abstract
The utility model discloses an optical terminal network management system, which comprises an optical terminal, a network management center and a network management module which is connected with one or a plurality of optical terminals and communicated with the network management center. The optical terminal monitors self status in real-time and reports the information of self status to the network management module, and also executes a configuration command transmitted by the network management module; the network management module is responsible for transmitting the configuration command transmitted by the network management center to the optical terminal, and is also used for transmitting the status information reported by the optical terminal to the network management center; the network management center receives the status information of the optical terminal from the network management module and displays the status information to users, and also transmits the configuration command of the optical terminal of users to the network management module. When the optical terminal of the utility model has a problem, the optical terminal can make a diagnosis automatically and the status information can be obtained by the network management center remotely, thereby needing no field diagnosis and having a high efficiency; at the same time, the optical terminal can be maintained by a remote configuration, which is very convenient. The utility model also provides an optical terminal.
Description
Technical field
The utility model relates to the optical transceiver technical field, relates in particular to a kind of optical transceiver and a kind of optical transceiver network management system that can realize telemanagement.
Background technology
Optical transceiver is the important transmission equipment in the optical communication system, mainly is to carry out opto-electronic conversion and transmission function.Generally be used for fields such as telecommunications, electric power, monitoring, Industry Control, video transmission, have a wide range of applications at industry-by-industry.Here said optical transceiver refers to and is used for supervisory control system and is used for the Digital Optical Terminal of integrated informations such as transmission of video, data, Ethernet, audio frequency.Digital Optical Terminal is that want image transmitted, voice and data-signal are carried out digitized processing, again these digital signals is carried out multiplexing process, makes the digital signal of multi-path low speed convert one road high speed signal to, and this conversion of signals is become light signal.At receiving terminal light signal is reduced into the signal of telecommunication, the high speed signal of reduction decomposites original multi-path low speed signal, again these data-signals is reduced into image, voice and data-signal at last.In general, optical transceiver will use in pairs, and transmitting terminal and receiving terminal are promptly arranged.Optical transceiver has single channel video, multi-channel video again, the branch of simple video, attached data (control), subsidiary audio frequency, subsidiary Ethernet.
Because the transmission range of the optical transceiver that uses is distant in pairs, under the normal condition, distance between the optical transceiver of two paired uses can reach more than tens kilometers even 100 kilometers, if the far-end optical transceiver carried out work such as parameter setting, failure diagnosis, the operation that must the attendant be on the scene in person, the two places that may also need to place optical transceiver equipment in case of necessity all have attendant's operation of showing up.
Existing solution optical transceiver testing and diagnosing problem, usually adopt dedicated tester to solve, promptly come optical transceiver is tested by adding dedicated tester, wherein a kind of is internal loopback by the far-end optical transceiver, referring to Fig. 1, this kind mode is that a certain road function port with dedicated tester and local optical transceiver A couples together with cable, far-end optical transceiver B function corresponding port signal is encircled certainly in inside, dedicated tester sends cycle tests, through local optical transceiver A, far-end optical transceiver B is looped back to local optical transceiver A and dedicated tester again, thereby finishes the detection of cycle tests, the statistics of error code and alarm.In addition, also can pass through the external loop of far-end optical transceiver, and the mode of surveying be come the test light terminal by two dedicated tester A1, B1.
But, the mode of above-mentioned employing dedicated tester, the user also needs to buy dedicated tester except buying optical transceiver, and equipment cost increases; And when optical transceiver went wrong, the attendant must be on the scene, and just can diagnose and fault location, and efficient is low.And above-mentioned solution is configured and safeguards optical transceiver if desired, the operation that still must be on the scene, maintenance cost height only from testing and diagnosing optical transceiver angle.For the video optical multiplexer of unidirectional application, because its transmitted in both directions bandwidth chahnel is asymmetric, and the restriction of hardware circuit aspect, be difficult to realize complete machine inside and outside loopback, more increased the difficulty of dealing with problems.
The utility model content
The purpose of this utility model provides a kind of optical transceiver and a kind of optical transceiver network management system, can realize the Long-distance Control optical transceiver, and it is carried out failure diagnosis or maintain configuration.
For this reason, the utility model adopts following technical scheme:
A kind of optical transceiver network management system comprises optical transceiver, network management center, and connects the webmaster module that one or more optical transceivers are communicated by letter with network management center;
Described optical transceiver is monitored in real time to oneself state, and gives described webmaster module with state information report; And, carry out the configuration order that the webmaster module sends;
Described webmaster module, the command down-transmitting of being responsible for network management center is sent is to optical transceiver; And, be used for the state information that optical transceiver reports is sent to network management center;
Described network management center receives the state information of the optical transceiver of webmaster module transmission, and is shown to the user; And, the user is sent to the webmaster module to the configuration order of optical transceiver.
A kind of optical transceiver is communicated by letter with network management center, comprises administration module on the plate;
Administration module on the described plate is used for the optical transceiver state is monitored in real time, and gives network management center with state information report; And, carry out the configuration order that network management center sends.
Described optical transceiver comprises administration module on the plate, and administration module comprises on the described plate:
Logical processing unit, the state of responsible monitor optical terminal is handled the generation state information with monitoring result through digital filtering; And the configuration order of utilizing centralized control unit to send is configured optical transceiver;
Centralized control unit obtains described state information and sends to described webmaster module from described Logical processing unit; And the configuration order that the webmaster module is sent is transmitted to Logical processing unit; Simultaneously, the control command of responsible optical transceiver and opposite end optical transceiver is mutual;
The storage center unit, the static information of storage optical transceiver also offers described centralized control unit.
Described webmaster module comprises:
First interface unit is responsible for communicating by letter with network management center;
Second interface unit is responsible for communicating by letter with optical transceiver by administration module on the plate;
Memory cell is responsible for the optical transceiver state information that second interface unit obtains is stored;
The comparison control unit is responsible for the information of optical transceiver state information and cell stores is compared, and whether control reports diagnostic result by first interface unit to network management center; And, which optical transceiver the configuration order that obtains from first interface unit be defined as after, send to optical transceiver by second interface unit.
Described webmaster module also comprises: the logical unit of adopting, the operating state of being responsible for collecting optical transceiver machine cage of living in; Adjustment unit according to logical variation of adopting the ambient temperature of collecting the unit, is adjusted the work of machine cage internal fan.
Described network management center comprises:
Server: obtain the state information of optical transceiver and offer database storage from described webmaster module, and the state information of being responsible for extracting optical transceiver from database sends to client and is shown to the user; Receive the configuring request that client sends, from database, obtain configuration order and send to the webmaster module;
Database: the configuration information of storing each optical transceiver; The storage operation record; Storage warning information, history alarm record; Temporary optical transceiver operating state; Temporary configuration order;
Client: be responsible for the user operating platform is provided, comprise the state status of display light terminal, and the interface that the input configuring request is provided.
Described server comprises:
The main program processing module is responsible for handling client-side interface, and management is connected with the network of webmaster module;
Network process module obtains the configuration order that will send from database module, sends to the webmaster module by interface; Receive the state information of webmaster module, after the composition complete data packet, send the data to message processing module (MPM);
Message processing module (MPM) obtains the partial data message from network process module, and data are carried out Treatment Analysis, and the result gives database module with data analysis; Receive command request, form configuration order, give database module configuration order;
Database module provides data to network process module, and configuration order is provided; Receive communications protocol and resolve the configuration order and the state information of class, deposit database in.
Described optical transceiver oneself state comprises: optical fiber link state, system synchronization state, vision signal stress state or data transmit-receive state;
The static information of described optical transceiver comprises optical transceiver model parameter, optical transceiver type or port configuration information.
The operating state of described machine cage comprises: temperature or humidity in machine cage power supply status, machine cage internal fan operating state, the machine cage.
Optical transceiver of the present utility model administration module on band plate can be monitored optical transceiver in real time, and monitored results is reported network management center by network, realizes the telemanagement to optical transceiver; And network management center sends to administration module on the plate by network with configuration order, and administration module is resolved configuration order and notified optical transceiver to carry out configuration operation on the plate, realizes long-range configuring maintenance to optical transceiver.As seen, adopt the utility model, when optical transceiver goes wrong, can not need field diagnostic, the efficient height by the long-range acquisition of network management center; Simultaneously, can safeguard optical transceiver by Remote configuration, very convenient.
Description of drawings
Fig. 1 is a prior art optical transceiver testing and diagnosing schematic diagram;
Fig. 2 is a utility model embodiment optical transceiver network management system structural representation;
Fig. 3 is a utility model embodiment server architecture schematic diagram;
Fig. 4 is a utility model embodiment webmaster modular structure schematic diagram;
Fig. 5 is an administration module structural representation on the utility model embodiment plate.
Embodiment
Long-distance Control is exactly by network, and remote equipment is carried out remote control, remote measurement, remote signalling, remote regulating, and realizes the technology under the unattended situation remote equipment monitored.The utility model utilizes the thought of Long-distance Control, and optical transceiver is carried out remote diagnosis and configuring maintenance.
Referring to Fig. 2, be the optical transceiver network management system structural representation of the utility model embodiment.Whole system is made up of network management center 201, webmaster module 202 and optical transceiver 203.Wherein, network management center 201 comprises server 211, database 212 and client 213 again; And optical transceiver 203 inside have administration module 214 on the plate.Wherein, webmaster module 202 and optical transceiver 203 unifications can be called the foreground, network management center 201 is called the backstage.
State optical transceiver 203 general paired uses as preceding.Transmit leg optical transceiver 203 is responsible for gathering vision signals, is outwards sent data-signal; And recipient's optical transceiver 203 is responsible for receiving the light signal of far end transmitter through transmission mediums such as optical fiber, and is reduced into corresponding video and data-signal.Generally speaking, transmit leg optical transceiver 203 is in the state that the strange land disperses, and the local distance of distance is distant; And recipient's optical transceiver 203 can be concentrated and is positioned over this locality.So, the utility model preferred embodiment is that webmaster module 202 is placed in the machine cage of recipient's optical transceiver 203 1 sides, referring to Fig. 2, place a plurality of optical transceivers 203 in the machine cage, these optical transceiver 203 shared webmaster modules 202, and undertaken by administration module 214 on the plate separately alternately about diagnosis and configuration information between transmit leg optical transceiver 203 and the recipient's optical transceiver 203.Except preferred embodiment, also can in the machine cage of transmit leg optical transceiver 203, webmaster module 202 be set, by transmitting diagnosis and configuration information separately between the webmaster module 202.
Below respectively from the plate of network management center 201, webmaster module 202 and optical transceiver 203 angle of administration module 214 the utility model embodiment is described in detail.
(1) network management center 201
(1) server 211
Server 211 is centers of overall optical terminal network management system, is responsible for all information processings and scheduling, finishes the functions such as exchanges data, Account Administration, database 212 management and log processing with each functional module, and gets in touch with client 213.Can regularly set up during server 211 work and being connected of webmaster module 202, the operating state of inquiry webmaster module 202, and the state information of the optical transceiver 203 that is attached thereto, the operating state that inquires, warning information etc. are deposited in the database 212 after managing significant data processing.On the other hand, receive the connection requirement of client 213, the information of needs is provided to client 213 with the form of list.Referring to Fig. 3, it mainly is made up of the following aspects:
A) main program processing module
. the process user interface, management is connected with the network on foreground
. from database 212, obtain service data, the display systems current state
. call communications protocol and resolve class formation command message, the configuration to the foreground is provided
B) network process module
Main be responsible for foreground interface (socket interface) be connected transceive data:
. obtain the configuration order (data command message) that will send from database module, send to the foreground by the socket interface
. receive the state information (data message content) of socket, after the composition complete data packet, send datagram to message processing module (MPM)
C) message processing module (MPM)
The main parsing of being responsible for Foreground Data, the group bag of background commands:
. obtain the partial data message from network process module, data are carried out Treatment Analysis, the result gives database module with data analysis
. receive command request, form command message, give database module command message
D) database module
The main interface of being responsible for database 212, carry out access to data:
. data are provided for client 213 and server 211
. provide command message to network process module
. accept communications protocol and resolve the order data of class and resolve result data, deposit in the database 212
Be not difficult to find out that from top introduction the workflow of server 211 mainly comprises two branches to server 211:
Configuration branch (solid line flow process among Fig. 3) to optical transceiver 203: the configuration information that main program module obtains connecting from database 212, create network process module, open with the socket on foreground and be connected, main program module takes out the command message that will send again from database 212, the transmission order of calling network process module sends to the foreground with configuration information;
Receive branch's (dotted line flow process among Fig. 3) of optical transceiver 203 diagnostic results: after connecting with the foreground, obtain the data message finished by network process module from receiving data, transferring to message processing module (MPM) handles, giving database 212 by database module preserves, then, send to client 213 from database 212 acquisition diagnostic datas and be shown to the user.
(2) database 212
The configuration information of all model optical transceivers 203 of storage in the database 212, the storage operation record; Storage warning information, history alarm record; Temporary optical transceiver operating state; Temporary configuration order; When server 211 needs, provide information.Data can dynamically add, delete, revise or backup along with the change of optical transceiver 203 models.In addition, all clients 213 must all be finished by database 212 with the data of server 211 exchanges, comprise configuration order (command message) and state information (data message content) etc.
(3) client 213
Client 213 provides friendly administration interface for the user, is convenient to man-machine interaction.When client 213 need be communicated by letter with server 211, write database, read again from database 212 by server 211 and operate as required in the mode of data base entries.
Generally speaking, client 213 is only extracted data message, warning information and optical transceiver 203 configuration informations etc. that need from database 212, show different interface and picture and text according to user's needs then.If desired optical transceiver 203 is configured and safeguards, just when the foreground sends command message, just call group bag class and generate command message, deposit database 212 in, from database 212, extract the return information in the server 211 then, whether definite order is executed correctly, and extracts data message.
(2) the webmaster module 202
Webmaster module 202 is mounted in the webmaster module in the machine cage.It has two serial ports, simplifies the RS232 interface for one, realizes and background communication; A RS485 interface constitutes bus, realize with the machine cage on the plate of optical transceiver 203 administration module 214 reach communicating by letter to 214 of administration modules on the end plate.If the quantity of webmaster module 202 is more, can converge back and background communication by NPORT.In addition, webmaster module 202 also has the general acquisition function of part, can gathering machine cage operating state, comprise that temperature (wet) is spent in the operating state of machine cage power supply (duplicate supply), fan and the machine cage, can also under the temperature and humidity conditions of setting, control the operating state of fan automatically.
The information such as operating state that webmaster module 202 regularly removes to check optical transceiver 203, after it receives the state information that optical transceiver sends over, compare with the information that the last time receives, judging whether needs to produce active alarm, as needs, produces active alarm information, the active initiation is connected with background net management center 201, after connecting affirmation, send a warning message, otherwise wait for the inquiry or the configuration at higher level's background net management center 201 to the backstage.
Referring to Fig. 4, be webmaster module 202 internal structure schematic diagrames, comprise first interface unit 411, second interface unit 412, memory cell 413 and comparison control unit 414.
In addition, webmaster module 202 can also comprise the logical unit 415 of adopting, can gathering machine cage operating state; And adjustment unit 416, according to logical variation of adopting the ambient temperature of collecting unit 415, adjust the work of machine cage internal fan.
(3) administration module 214 on the plate
The state information that administration module 214 is gathered optical transceiver 203 on the plate of optical transceiver 203, adopt extensive logical device able to programme (FPGA or CPLD) to finish the status monitoring of optical transceiver 203 in the design, comprise that optical fiber link state, system synchronous information, vision signal have or not loading, data to have or not transmitting-receiving etc., these information all change constantly, the inferior state that collects of most recent is preserved at every turn, carry out digital filtering and handle, generate state information; Logic chip also onboard single-chip microcomputer (for example, the C51 single-chip microcomputer) cooperates down, finishes the operation of ring certainly, forced resetting of selection, the port of FPDP baud rate etc., and these operations all are to send the difference of ordering according to the backstage, carry out corresponding configuration; Adopt single-chip microcomputer to cooperate a slice storage chip (for example, 24C02) to finish the access of static informations such as optical transceiver model parameter, optical transceiver type, port arrangement, just configure when these information are dispatched from the factory a bit, can not change, as the optical transceiver model etc.; Some can be adjusted in the later stage, as port arrangement; These all information can be by the serial ports calcaneus rete tube module swap data of single-chip microcomputer.
When transmitting vision signal, data, audio frequency, existing data channel to be expanded, extended channel is called inband NMS channel, offers single-chip microcomputer, as the passage of optical transceiver 203 swapping datas of paired use.The utility model has been simulated the serial ports of a full duplex on single-chip microcomputer, utilize above-mentioned passage to come transferring command information and state information, realizes the operations such as management, configuration, failure diagnosis to far-end optical transceiver 203.Under the cooperation of this inband network management, finish optical transceiver 203 function self checks, fault location under background commands is supported.
Referring to Fig. 5, be the 214 internal structure schematic diagrames of administration module on the plate, it comprises Logical processing unit 511, centralized control unit 512 and storage center unit 513.
The static information of storage center unit 513 storage optical transceivers 203, for example the model parameter of optical transceiver 203, type, port arrangement etc.
Adopt optical transceiver 203 of the present utility model or optical transceiver network management system, can realize that the optical transceiver oneself state detects, and, can report network management center 201 automatically; In the time will being configured, also only need, and the maintenance that do not need to be on the scene can realize telemanagement that simultaneously, efficient and accuracy significantly improve at local operation to optical transceiver 203.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1. an optical transceiver network management system comprises optical transceiver, it is characterized in that also comprising: network management center, and connect the webmaster module that one or more optical transceivers are communicated by letter with network management center;
Described optical transceiver is monitored in real time to oneself state, and gives described webmaster module with state information report; And, carry out the configuration order that the webmaster module sends;
Described webmaster module, the command down-transmitting of being responsible for network management center is sent is to optical transceiver; And, be used for the state information that optical transceiver reports is sent to network management center;
Described network management center receives the state information of the optical transceiver of webmaster module transmission, and is shown to the user; And, the user is sent to the webmaster module to the configuration order of optical transceiver.
2. optical transceiver network management system according to claim 1 is characterized in that described optical transceiver comprises administration module on the plate, and administration module comprises on the described plate:
Logical processing unit, the state of responsible monitor optical terminal is handled the generation state information with monitoring result through digital filtering; And the configuration order of utilizing centralized control unit to send is configured optical transceiver;
Centralized control unit obtains described state information and sends to described webmaster module from described Logical processing unit; And the configuration order that the webmaster module is sent is transmitted to Logical processing unit; Simultaneously, the control command of responsible optical transceiver and opposite end optical transceiver is mutual;
The storage center unit, the static information of storage optical transceiver also offers described centralized control unit.
3. optical transceiver network management system according to claim 2 is characterized in that, described webmaster module comprises:
First interface unit is responsible for communicating by letter with network management center;
Second interface unit is responsible for communicating by letter with optical transceiver by administration module on the plate;
Memory cell is responsible for the optical transceiver state information that second interface unit obtains is stored;
The comparison control unit is responsible for the information of optical transceiver state information and cell stores is compared, and whether control reports diagnostic result by first interface unit to network management center; And, which optical transceiver the configuration order that obtains from first interface unit be defined as after, send to optical transceiver by second interface unit.
4. optical transceiver network management system according to claim 3 is characterized in that, described webmaster module also comprises: the logical unit of adopting, the operating state of being responsible for collecting optical transceiver machine cage of living in; Adjustment unit according to logical variation of adopting the ambient temperature of collecting the unit, is adjusted the work of machine cage internal fan.
5. according to the arbitrary described optical transceiver network management system of claim 1 to 4, it is characterized in that described network management center comprises:
Server: obtain the state information of optical transceiver and offer database storage from described webmaster module, and the state information of being responsible for extracting optical transceiver from database sends to client and is shown to the user; Receive the configuring request that client sends, from database, obtain configuration order and send to the webmaster module;
Database: the configuration information of storing each optical transceiver; The storage operation record; Storage warning information, history alarm record; Temporary optical transceiver operating state; Temporary configuration order;
Client: be responsible for the user operating platform is provided, comprise the state status of display light terminal, and the interface that the input configuring request is provided.
6. optical transceiver network management system according to claim 5 is characterized in that, described server comprises:
The main program processing module is responsible for handling client-side interface, and management is connected with the network of webmaster module;
Network process module obtains the configuration order that will send from database module, sends to the webmaster module by interface; Receive the state information of webmaster module, after the composition complete data packet, send the data to message processing module (MPM);
Message processing module (MPM) obtains the partial data message from network process module, and data are carried out Treatment Analysis, and the result gives database module with data analysis; Receive command request, form configuration order, give database module configuration order;
Database module provides data to network process module, and configuration order is provided; Receive communications protocol and resolve the configuration order and the state information of class, deposit database in.
7. an optical transceiver is communicated by letter with network management center, it is characterized in that, comprises administration module on the plate;
Administration module on the described plate is used for the optical transceiver state is monitored in real time, and gives network management center with state information report; And, carry out the configuration order that network management center sends.
8. optical transceiver according to claim 7 is characterized in that, administration module comprises on the described plate:
Logical processing unit, the state of responsible monitor optical terminal is handled the generation state information with monitoring result through digital filtering; And the configuration order of utilizing centralized control unit to send is configured optical transceiver;
Centralized control unit obtains described state information and sends to described network management center from described Logical processing unit; And the configuration order that network management center is sent is transmitted to Logical processing unit; Simultaneously, the control command of responsible optical transceiver and opposite end optical transceiver is mutual;
The storage center unit, the static information of storage optical transceiver also offers described centralized control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200025470U CN201044449Y (en) | 2007-01-25 | 2007-01-25 | Optical transmitter-receiver and network management system of optical transmitter-receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200025470U CN201044449Y (en) | 2007-01-25 | 2007-01-25 | Optical transmitter-receiver and network management system of optical transmitter-receiver |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025421A (en) * | 2010-11-24 | 2011-04-20 | 天津欧迈通信技术有限公司 | Gigabit broadband isolation pseudo-synchronous digital hierarchical (PDH) optical transmitter and receiver |
| CN101674463B (en) * | 2009-09-02 | 2011-08-17 | 太仓市同维电子有限公司 | Method for improving reliability of passive optical network video monitoring system |
| CN104618696A (en) * | 2013-11-05 | 2015-05-13 | 杭州海康威视数字技术股份有限公司 | Information processing method and system for video optical transceiver |
| CN105515653A (en) * | 2015-11-27 | 2016-04-20 | 山东超越数控电子有限公司 | Optical terminal state monitoring implementing method |
| CN113993316A (en) * | 2021-10-26 | 2022-01-28 | 保定卓能电力科技有限公司 | Optical transmitter and receiver and optical transmitter and receiver network management system |
-
2007
- 2007-01-25 CN CNU2007200025470U patent/CN201044449Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674463B (en) * | 2009-09-02 | 2011-08-17 | 太仓市同维电子有限公司 | Method for improving reliability of passive optical network video monitoring system |
| CN102025421A (en) * | 2010-11-24 | 2011-04-20 | 天津欧迈通信技术有限公司 | Gigabit broadband isolation pseudo-synchronous digital hierarchical (PDH) optical transmitter and receiver |
| CN104618696A (en) * | 2013-11-05 | 2015-05-13 | 杭州海康威视数字技术股份有限公司 | Information processing method and system for video optical transceiver |
| CN104618696B (en) * | 2013-11-05 | 2017-12-19 | 杭州海康威视数字技术股份有限公司 | The information processing method and system of video optical multiplexer |
| CN105515653A (en) * | 2015-11-27 | 2016-04-20 | 山东超越数控电子有限公司 | Optical terminal state monitoring implementing method |
| CN113993316A (en) * | 2021-10-26 | 2022-01-28 | 保定卓能电力科技有限公司 | Optical transmitter and receiver and optical transmitter and receiver network management system |
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