CN104852980A - Tunnel monitoring system - Google Patents

Tunnel monitoring system Download PDF

Info

Publication number
CN104852980A
CN104852980A CN201510233982.3A CN201510233982A CN104852980A CN 104852980 A CN104852980 A CN 104852980A CN 201510233982 A CN201510233982 A CN 201510233982A CN 104852980 A CN104852980 A CN 104852980A
Authority
CN
China
Prior art keywords
information process
monitoring station
unit
process unit
preprocessing unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201510233982.3A
Other languages
Chinese (zh)
Other versions
CN104852980B (en
Inventor
何鸿云
李家武
崔健
崔恒斌
谢洪亮
何汶近
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENGDU YUANDA TECHNOLOGY Co Ltd
Original Assignee
CHENGDU YUANDA TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHENGDU YUANDA TECHNOLOGY Co Ltd filed Critical CHENGDU YUANDA TECHNOLOGY Co Ltd
Priority to CN201510233982.3A priority Critical patent/CN104852980B/en
Publication of CN104852980A publication Critical patent/CN104852980A/en
Application granted granted Critical
Publication of CN104852980B publication Critical patent/CN104852980B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/12Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/22Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42Loop networks
    • H04L12/423Loop networks with centralised control, e.g. polling

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Alarm Systems (AREA)

Abstract

The invention provides a tunnel monitoring system which comprises a main monitoring station, a standby monitoring station, M information processing units, and (M-1) pre-processing stages. Each of the pre-processing stages comprises at least two pre-processing units, and M is an integer larger than 1. The main monitoring station and the standby monitoring station are mutually connected and are hot standby of each other. The M information processing units are orderly connected in series, and two adjacent information processing units are hot standby of each other. The first information processing unit is connected to the main monitoring station, and the Mth information processing unit is connected to the standby monitoring station. At least two pre-processing units are orderly connected in series. The first pre-processing unit in the mth pre-processing stage is connected to the mth information processing unit, the last pre-processing unit in the mth pre-processing stage is connected to the (m+1)th information processing unit, and m is larger than or equal to 1 and is smaller than or equal to (M-1). The tunnel monitoring system provided by the invention has the advantages of high reliability, strong self-healing capability and easy extension and maintenance.

Description

Tunnel monitoring system
Technical field
The present invention relates to supervisory control system technical field, particularly a kind of tunnel monitoring system.
Background technology
Along with the fast development of China's traffic route, the tunnel construction project of railway and highway grows with each passing day.Due to geographical conditions and the tunnel itself of China's complexity, tunnel monitoring system plays extremely important effect in the operation and management and accident treatment in tunnel.If do not adopted advanced monitoring management measure, when, awful weather large at the volume of traffic, very easily traffic accident and traffic jam occur, the monitoring management in tunnel becomes the important leverage that vehicle normally runs at tunnel safety.Along with the development of computer technology, image processing techniques, mechanics of communication and control technology, ethernet technology and bussing technique breach original technical bottleneck, and the high speed making tunnel monitoring system achieve monitor message is shared.
Traditional tunnel monitoring system adopts tree structure, several information process units comprise monitoring station, managing by described monitoring station and several preprocessing unit controlled by described information process unit.Described preprocessing unit is the minimum component units in tunnel monitoring system, comprises each actuating equipment in front end, and major function is acquisition monitoring data, sends monitor data and perform the monitored instruction of described information process unit forwarding; Described information process unit comprises main control system, video server and memory device, major function controls described preprocessing unit, collect monitor data that described preprocessing unit sends and be forwarded to described monitoring station, the audio, video data of the control command forwarding described monitoring station to described preprocessing unit and in storage system; Described monitoring station comprises monitoring host computer, data server, application server, video server, telephony server, operation board, speech ciphering equipment, display device and memory device, major function is the described information process unit of management, and the operation management of charge tunnel supervisory control system, the management of prediction scheme and enforcement and data store.
Manage three information process units for described monitoring station, each information process unit controls three preprocessing unit, Fig. 1 is the structural representation of traditional tunnel monitoring system.Described tunnel monitoring system comprises monitoring station 1; Described monitoring station 1 link information processing unit 11, information process unit 12 and information process unit 13; Described information process unit 11 connects preprocessing unit 111, preprocessing unit 112 and preprocessing unit 113, described information process unit 12 connects preprocessing unit 121, preprocessing unit 122 and preprocessing unit 123, and described information process unit 13 connects preprocessing unit 131, preprocessing unit 132 and preprocessing unit 133.Conventional tunnel supervisory control system structure shown in Fig. 1 is easily destroyed when disaster occurs, and the reliability of described tunnel monitoring system is low.
Summary of the invention
To be solved by this invention is the problem that existing tunnel monitoring system reliability is low.
For solving the problem, the invention provides a kind of tunnel monitoring system, comprise main monitoring station, monitoring station for subsequent use, a M information process unit and (M-1) individual pre-process level, each pre-process level comprises at least two preprocessing unit, M be greater than 1 integer;
Described main monitoring station is connected with described monitoring station for subsequent use and hot standby each other;
A described M information process unit is connected successively and adjacent two information process units are hot standby each other, and first information process unit connects described main monitoring station, and M information process unit connects described monitoring station for subsequent use;
Described at least two preprocessing unit are connected successively, in m pre-process level, first preprocessing unit connects m information process unit, in m pre-process level, last preprocessing unit connects (m+1) individual information process unit, 1≤m≤(M-1).
Optionally, a described M information process unit is connected successively by first communications cable, and described at least two preprocessing unit are connected successively by second communication cable, and described first communications cable and described second communication cable are arranged in same wire casing.
Optionally, described main monitoring station is connected by public network with described monitoring station for subsequent use.
Optionally, when described main monitoring station is in normal operating conditions, described monitoring station for subsequent use is as router or switch.
Optionally, described main monitoring station and described monitoring station for subsequent use are suitable for the monitor data receiving described M information process unit forwarding, produce and send monitored instruction to a described M information process unit.
Optionally, described information process unit is suitable for forwarding described monitored instruction to described preprocessing unit, and receives described monitor data from described preprocessing unit.
Optionally, described preprocessing unit is suitable for performing described monitored instruction, and gathers described monitor data.
Optionally, the quantity of the preprocessing unit in each pre-process level is equal.
Compared with prior art, the present invention has the following advantages:
Tunnel monitoring system provided by the invention, comprises main monitoring station, monitoring station for subsequent use, multiple information process unit and multiple pre-process level.Described main monitoring station and described monitoring station for subsequent use hot standby each other, adjacent two information process units are hot standby each other, and described main monitoring station, described monitoring station for subsequent use and described multiple information process unit looping communication link, the preprocessing unit looping communication link in described adjacent two information process units and described pre-process level.Therefore, between described main monitoring station and each information process unit of its management, form many communication links between described information process unit and each preprocessing unit of its control.By adopting the networking mode of two-node cluster hot backup and many communication links, the communication link in tunnel monitoring system provided by the invention, when suffering that disaster is destroyed, can be substituted by another communication link, thus improves the reliability of described tunnel communication system.Further, tunnel monitoring system network branches provided by the invention is few, thus self-healing ability strong, be easy to expansion and safeguard.
In possibility of the present invention, first communications cable connecting adjacent two information process units is arranged in same wire casing with the second communication cable being connected adjacent two preprocessing unit, while realizing two-node cluster hot backup and many communication links, be easy to track laying and maintenance.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional tunnel monitoring system;
Fig. 2 is the structural representation of traditional tunnel monitoring system when breaking down;
Fig. 3 is the structural representation of the tunnel monitoring system of the embodiment of the present invention;
Fig. 4 is structural representation when breaking down between information process unit in the tunnel monitoring system of the embodiment of the present invention;
Fig. 5 is structural representation when breaking down between preprocessing unit in the tunnel monitoring system of the embodiment of the present invention;
Fig. 6 is the structural representation in the tunnel monitoring system of the embodiment of the present invention between information process unit and when all breaking down between preprocessing unit.
Embodiment
Just as described in the background art, traditional tunnel monitoring system adopts tree structure, and communication link easily suffers that disaster is destroyed and reduces the reliability of tunnel monitoring system.Fig. 2 is the structural representation of the tunnel monitoring system shown in Fig. 1 when breaking down, when communication link between described monitoring station 1 and described information process unit 11 breaks down, the guarded region that described preprocessing unit 111 ~ described preprocessing unit 113 is responsible for cannot be controlled by described monitoring station 1; When communication link between described information process unit 12 and described preprocessing unit 122 breaks down, the guarded region that described preprocessing unit 122 is responsible for cannot be controlled by described monitoring station 1.That is, all single link communications in existing tunnel monitoring system between each information process unit and described monitoring station 1, between each information process unit and its each preprocessing unit controlled, when arbitrary communication link breaks down, described tunnel monitoring system cannot obtain complete monitor data.Further, when described monitoring station 1 breaks down, existing tunnel monitoring system is by complete failure.
The invention provides a kind of tunnel monitoring system, comprise main monitoring station, monitoring station for subsequent use, a M information process unit and (M-1) individual pre-process level, each pre-process level comprises at least two preprocessing unit, wherein, M be greater than 1 integer.The region area size that M can carry out monitoring as required is arranged: the region area that needs carry out monitoring is larger, and M arranges larger.It should be noted that tunnel monitoring system provided by the invention is applicable to various types of tunnel, such as railway tunnel, vcehicular tunnel, subway tunnel etc., the present invention is not construed as limiting this.
Particularly, described main monitoring station is connected with described monitoring station for subsequent use and hot standby each other.Described main monitoring station comprises monitoring host computer, data server, application server, video server, telephony server, operation board, speech ciphering equipment, display device and memory device, be suitable for the monitor data receiving described M information process unit forwarding, produce and send monitored instruction to a described M information process unit, and the operation management of charge tunnel supervisory control system, the management of prediction scheme and enforcement and data store.Described monitoring station for subsequent use is connected with described main monitoring station by public network, and the 26S Proteasome Structure and Function of its 26S Proteasome Structure and Function and described main monitoring station is similar.When described main monitoring station is in normal operating conditions, described monitoring station for subsequent use is in park mode, can as router or switch.
A described M information process unit is connected successively and adjacent two information process units are hot standby each other, and first information process unit connects described main monitoring station, and M information process unit connects described monitoring station for subsequent use.Particularly, described information process unit comprises main control system, video server and memory device, is suitable for forwarding described monitored instruction to described preprocessing unit, and receives described monitor data from described preprocessing unit.
Described at least two preprocessing unit are connected successively, in m pre-process level, first preprocessing unit connects m information process unit, in m pre-process level, last preprocessing unit connects (m+1) individual information process unit, 1≤m≤(M-1).Particularly, described preprocessing unit comprises each actuating equipment in front end, is suitable for performing described monitored instruction, and gathers described monitor data.It should be noted that, the quantity of the preprocessing unit in each pre-process level can be set to equal, and also can not be set to not etc., the present invention is not construed as limiting this.
Further, a described M information process unit is connected successively by first communications cable, and described at least two preprocessing unit are connected successively by second communication cable.Described first communications cable and described second communication cable can be arranged in same wire casing, with while realizing two-node cluster hot backup and many communication links, are easy to track laying and maintenance.
Tunnel monitoring system provided by the invention, hot standby each other between described main monitoring station and described monitoring station for subsequent use, set up two communication links between information process unit and main monitoring station: one is information process unit-main monitoring station communication link; One is information process unit-monitoring station for subsequent use-main monitoring station communication link.Adjacent two information process units are hot standby each other, set up two communication links between information process unit and information process unit: one is information process unit-information process unit communication link; One is information process unit-preprocessing unit-information process unit communication link.By adopting the networking mode of two-node cluster hot backup and many communication links, the communication link in tunnel monitoring system provided by the invention, when suffering that disaster is destroyed, can be substituted by another communication link, thus improves the reliability of described tunnel communication system.Further, tunnel monitoring system network branches provided by the invention is few, thus self-healing ability strong, be easy to expansion and safeguard.
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Control three preprocessing unit for M=4, each information process unit, Fig. 3 is the structural representation of the tunnel monitoring system of the embodiment of the present invention.Described tunnel monitoring system comprises main control station 3, monitoring station for subsequent use 4, information process unit 31 ~ information process unit 34,3 pre-process levels.Wherein, first pre-process level comprises preprocessing unit 311, preprocessing unit 312 and preprocessing unit 313; Second pre-process level comprises preprocessing unit 321, preprocessing unit 322 and preprocessing unit 323; 3rd pre-process level comprises preprocessing unit 331, preprocessing unit 332 and preprocessing unit 333.
In the present embodiment, described main monitoring station 3 is connected with described monitoring station 4 for subsequent use by public network 5.Described information process unit 31, described information process unit 32, described information process unit 33 and described information process unit 34 are connected successively, and, described information process unit 31 and described information process unit 32 hot standby each other, described information process unit 32 and described information process unit 33 hot standby each other, described information process unit 33 and described information process unit 34 hot standby each other.Described information process unit 31 connects described main monitoring station 3, and described information process unit 34 connects described monitoring station for subsequent use 4.
Described preprocessing unit 311, described preprocessing unit 312 and described preprocessing unit 313 are connected successively, and described preprocessing unit 311 connects described information process unit 31, and described preprocessing unit 313 connects described information process unit 32; Described preprocessing unit 321, described preprocessing unit 322 and described preprocessing unit 323 are connected successively, and described preprocessing unit 321 connects described information process unit 32, and described preprocessing unit 323 connects described information process unit 33; Described preprocessing unit 331, described preprocessing unit 332 and described preprocessing unit 333 are connected successively, and described preprocessing unit 331 connects described information process unit 33, and described preprocessing unit 333 connects described information process unit 34.
Below the operation principle of the tunnel monitoring system of the present embodiment is described:
When described tunnel monitoring system normally works, described monitoring station 4 for subsequent use is in park mode.The communication link of " described in described main monitoring station 3-monitoring station 4 for subsequent use described in information process unit 34-described in information process unit 33-described in information process unit 32-described in information process unit 31-" is formed between described main monitoring station 3 and multiple information process unit, the communication link of " described in described information process unit 31-preprocessing unit 313 described in preprocessing unit 312-described in preprocessing unit 311-" is formed between described information process unit 31 and multiple preprocessing unit, the communication link of " described in described information process unit 32-preprocessing unit 323 described in preprocessing unit 322-described in preprocessing unit 321-" is formed between described information process unit 32 and multiple preprocessing unit, the communication link of " described in described information process unit 33-preprocessing unit 333 described in preprocessing unit 332-described in preprocessing unit 331-" is formed between described information process unit 33 and multiple preprocessing unit.
When described main monitoring station 3 breaks down inefficacy, described monitoring station for subsequent use 4 replaces described main monitoring station 3 and works, and forms the communication link of " described in described monitoring station 4-for subsequent use information process unit 31 described in information process unit 32-described in information process unit 33-described in information process unit 34-" between described monitoring station 4 for subsequent use and multiple information process unit.
When described main monitoring station 3 is working properly, when there is communication failure between information process unit, there is communication failure between the described information process unit 31 shown in Fig. 4 and described information process unit 32, the communication link of " described in described main monitoring station 3-information process unit 31 " is formed between described main monitoring station 3 and described information process unit 31, the communication link of " described in described main monitoring station 3-information process unit 32 described in information process unit 33-described in information process unit 34-described in monitoring station 4-for subsequent use " is formed between described main monitoring station 3 and described information process unit 32.
When described main monitoring station 3 is working properly, when there is communication failure between preprocessing unit, there is communication failure between the described preprocessing unit 311 shown in Fig. 5 and described preprocessing unit 312, the communication link of " described in described information process unit 31-preprocessing unit 311 " is formed between described information process unit 31 and described preprocessing unit 311, the communication link of " described in described information process unit 31-preprocessing unit 312 described in preprocessing unit 313-described in information process unit 32-" is formed between described information process unit 31 and described preprocessing unit 312.
When there is communication failure when described main monitoring station 3 is working properly, between information process unit and communication failure occur between preprocessing unit, for between the described information process unit 31 shown in Fig. 6 and described information process unit 32, there is communication failure between described preprocessing unit 311 and described preprocessing unit 312, described preprocessing unit 311 is still controlled by described information process unit 31, and described preprocessing unit 312 and described preprocessing unit 313 change and controlled by described information process unit 32.Particularly, form the communication link of " described in described main monitoring station 3-preprocessing unit 311 described in information process unit 31-" between described main monitoring station 3 and described preprocessing unit 311, between described main monitoring station 3 and described preprocessing unit 312, form the communication link of " described in described main monitoring station 3-preprocessing unit 312 described in preprocessing unit 313-described in information process unit 32-described in information process unit 33-described in information process unit 34-described in monitoring station 4-for subsequent use ".
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.

Claims (8)

1. a tunnel monitoring system, is characterized in that, comprise main monitoring station, monitoring station for subsequent use, a M information process unit and (M-1) individual pre-process level, each pre-process level comprises at least two preprocessing unit, M be greater than 1 integer;
Described main monitoring station is connected with described monitoring station for subsequent use and hot standby each other;
A described M information process unit is connected successively and adjacent two information process units are hot standby each other, and first information process unit connects described main monitoring station, and M information process unit connects described monitoring station for subsequent use;
Described at least two preprocessing unit are connected successively, in m pre-process level, first preprocessing unit connects m information process unit, in m pre-process level, last preprocessing unit connects (m+1) individual information process unit, 1≤m≤(M-1).
2. tunnel monitoring system according to claim 1, it is characterized in that, a described M information process unit is connected successively by first communications cable, described at least two preprocessing unit are connected successively by second communication cable, and described first communications cable and described second communication cable are arranged in same wire casing.
3. tunnel monitoring system according to claim 1, is characterized in that, described main monitoring station is connected by public network with described monitoring station for subsequent use.
4. tunnel monitoring system according to claim 1, is characterized in that, when described main monitoring station is in normal operating conditions, described monitoring station for subsequent use is as router or switch.
5. tunnel monitoring system according to claim 1, is characterized in that, described main monitoring station and described monitoring station for subsequent use are suitable for the monitor data receiving described M information process unit forwarding, produces and sends monitored instruction to a described M information process unit.
6. tunnel monitoring system according to claim 5, is characterized in that, described information process unit is suitable for forwarding described monitored instruction to described preprocessing unit, and receives described monitor data from described preprocessing unit.
7. tunnel monitoring system according to claim 6, is characterized in that, described preprocessing unit is suitable for performing described monitored instruction, and gathers described monitor data.
8. tunnel monitoring system according to claim 1, is characterized in that, the quantity of the preprocessing unit in each pre-process level is equal.
CN201510233982.3A 2015-05-11 2015-05-11 tunnel monitoring system Active CN104852980B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510233982.3A CN104852980B (en) 2015-05-11 2015-05-11 tunnel monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510233982.3A CN104852980B (en) 2015-05-11 2015-05-11 tunnel monitoring system

Publications (2)

Publication Number Publication Date
CN104852980A true CN104852980A (en) 2015-08-19
CN104852980B CN104852980B (en) 2017-12-22

Family

ID=53852330

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510233982.3A Active CN104852980B (en) 2015-05-11 2015-05-11 tunnel monitoring system

Country Status (1)

Country Link
CN (1) CN104852980B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105471688B (en) * 2015-11-13 2019-04-09 山东康威通信技术股份有限公司 A kind of communication node, communication link and its working method based on communication node

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001325157A (en) * 2000-05-17 2001-11-22 Toshiba Corp Plant supervisory and control system
CN104267704A (en) * 2014-10-17 2015-01-07 成都四为电子信息股份有限公司 Novel tunnel monitoring system
CN204559636U (en) * 2015-05-11 2015-08-12 成都运达科技股份有限公司 tunnel monitoring system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001325157A (en) * 2000-05-17 2001-11-22 Toshiba Corp Plant supervisory and control system
CN104267704A (en) * 2014-10-17 2015-01-07 成都四为电子信息股份有限公司 Novel tunnel monitoring system
CN204559636U (en) * 2015-05-11 2015-08-12 成都运达科技股份有限公司 tunnel monitoring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105471688B (en) * 2015-11-13 2019-04-09 山东康威通信技术股份有限公司 A kind of communication node, communication link and its working method based on communication node

Also Published As

Publication number Publication date
CN104852980B (en) 2017-12-22

Similar Documents

Publication Publication Date Title
US10814893B2 (en) Vehicle control system
CN106506310B (en) A kind of rail vehicle network message transmission route determines method and device
CN103310387B (en) A kind of power telecom network method of operation Security Checking method
CN103067514A (en) Cloud computing resource optimization method and cloud computing resource optimization system used for video mointoring and analysis system
CN103414581A (en) Equipment fault alarm, prediction and processing mechanism based on data mining
CN104908783A (en) System architecture of comprehensive monitoring and maintaining system for railway electricity
CN104794870B (en) Electric power optical cable maintenance pre-warning system and method
CN103434540B (en) Urban Rail Transit equipment complex supervision method
CN108082219B (en) 2-by-2-out-of-2 redundant structure data processing method
CN104993582B (en) The control method and device of power system
CN102025540A (en) Topological structure of Ethernet passive optical network (EPON) network element equipment and configuration method thereof
CN204559636U (en) tunnel monitoring system
CN205123741U (en) Optical cable remote monitering system
CN104852980A (en) Tunnel monitoring system
CN105015581A (en) Railway network system for monitoring natural disasters and foreign invasion
CN105425785A (en) Method and system for platform fault recording
CN105100754B (en) The multiple step format storage cloud emerging system and method for a kind of facing video monitoring
Dong et al. Robustness analysis of layered public transport networks due to edge overload breakdown
CN204633789U (en) A kind of ethernet ring network business and flow-monitoring device
CN108111529A (en) A kind of new gauze urban track traffic access control system
CN207795305U (en) For the loop network system in sub-terrain mines stage casing
CN203352730U (en) Mining passive optical network system based on EPON technology
CN108183476A (en) The remodeling method and power distribution network of power distribution network
CN205157811U (en) Safety inspection intelligent management system based on network
CN104730381A (en) Line longitudinal current differential protection self-healing channel usability test method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
EXSB Decision made by sipo to initiate substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant