CN108632317A - Metro Passenger information processing framework - Google Patents
Metro Passenger information processing framework Download PDFInfo
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- CN108632317A CN108632317A CN201710168830.9A CN201710168830A CN108632317A CN 108632317 A CN108632317 A CN 108632317A CN 201710168830 A CN201710168830 A CN 201710168830A CN 108632317 A CN108632317 A CN 108632317A
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- communication subsystem
- subsystem
- information processing
- access points
- passenger information
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/04—Network management architectures or arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
Abstract
The present invention is suitable for Metro Information System technical field, provides a kind of Metro Passenger information processing framework.The framework includes control centre, station communication subsystem, train communication subsystem, cable network subsystem and car-ground radio subsystem；Cable network subsystem provides external network, video and data-signal transmission channel in order to control between center and station communication subsystem；Car-ground radio subsystem provides external network, video and data-signal transmission channel for station communication subsystem and train communication subsystem；Control centre interconnects with external network, including at least two core switch, and external network, video and data-signal are transmitted to station communication subsystem by core switch；External network, video and data-signal are sent to train communication subsystem by station communication subsystem.External network service and PIS related services can be realized while be transmitted to the framework, and simple in structure, can reduce equipment management complexity and equipment failure rate.
Description
Technical field
The invention belongs to Metro Information System technical field more particularly to a kind of Metro Passenger information processing frameworks.
Background technology
Currently, building a whole set of network based on 802.11G/N wireless technologys in city underground is used for transmission PIS
The information and content of (Passage Information System, passenger information system).The information of PIS systems transmission includes leading
Multiply information, integrated information and warning information etc..The network of PIS systems is a whole set of numerous and jumbled and complicated network, including multiple sons
System has the problems such as operation management is complicated, equipment failure rate is high.And be that PIS videos individually establish one and throw the net network, it is of high cost,
Efficiency is low, does not meet the requirement of sustainable development.
Invention content
In view of this, an embodiment of the present invention provides a kind of Metro Passenger information processing framework, to solve in the prior art
Equipment management complexity caused by complicated and the high problem of equipment failure rate.
An embodiment of the present invention provides a kind of Metro Passenger information processing frameworks, including control centre, station to communicate subsystem
System, train communication subsystem, cable network subsystem and car-ground radio subsystem；
The cable network subsystem, for providing outside between the control centre and the station communication subsystem
Network, video and data-signal transmission channel；
The car-ground radio subsystem, for being provided outside for the station communication subsystem and the train communication subsystem
Portion's network, video and data-signal transmission channel；
The control centre includes at least two core switch, by least two core switch to the vehicle
Communication subsystem of standing transmits external network, video and data-signal；
External network, video and data-signal are sent to the train communication subsystem by the station communication subsystem.
Preferably, the car-ground radio subsystem include wireless controller, be arranged beside underground railway track multiple first
Multiple second wireless access points of wireless access points and setting ON TRAINS.
Preferably, it is FIT architecture modes, institute between the wireless controller and the multiple first wireless access points
It is FAT architecture modes to state between multiple second wireless access points, the multiple first wireless access points and described more
It is FAT architecture modes between a second wireless access points.
Preferably, the station that first wireless access points pass through fiber optical transceiver and the station communication subsystem
Interchanger is connected.
Preferably, when the underground railway track is straight line, each first wireless access points spaced first
Pre-determined distance；When the underground railway track is curve, each first wireless access points spaced second it is default away from
From；
First pre-determined distance is more than second pre-determined distance.
Preferably, the backboard of every core switch is passive backplane；
Engine, power supply, fan and the corsspoint switch matrix of every core switch are redundancy structure；
The veneer of every core switch is the veneer with warm connection function；
The power module of every core switch is the power module with warm connection function.
Preferably, every core switch runs Fast Ethernet environmental protection agreement, and in the Fast Ethernet ring
Protect extension IPv4/IPv6 Routing Protocols and multiprotocol label switching function on protocol network.
Preferably, every core switch is all made of Graceful Restart technology；
Every core switch can run a variety of multicasting technologies to be carried out to bandwidth when providing multicast services
Reasonable distribution, and shield illegal group by least one of the inspection of IGMP source ports, source IP inspection and igmp filtering function
Broadcast source.
Preferably, the control centre is connected by firewall box and egress router with external network.
Preferably, the station communication subsystem includes station interchanger；The station switch configuration has multiple 10/
100Base-TX ethernet ports, at least one 1000Base-X SFP gigabit ethernet ports and at least one 10/100/
1000MBaseT interfaces.
The embodiment of the present invention compared with the existing technology possessed by advantageous effect：Cable network subsystem in order to control center and
External network, video and data-signal transmission channel are provided between the communication subsystem of station, car-ground radio subsystem is logical for station
Believe that subsystem and train communication subsystem provide external network, video and data-signal transmission channel, control centre and extranets
Network interconnects and transmits external network, video and data-signal, station communicator to station communication subsystem by core switch
External network, video and data-signal are sent to train communication subsystem by system, so as to realize while transmitting extranets
Network business and PIS related services, and it is simple in structure, equipment management complexity and equipment failure rate can be reduced.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment for those of ordinary skill in the art without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the structure diagram of Metro Passenger information processing system provided in an embodiment of the present invention；
Fig. 2 is the concrete structure schematic diagram of Metro Passenger information processing system provided in an embodiment of the present invention.
Specific implementation mode
In being described below, for illustration and not for limitation, it is proposed that such as tool of particular system structure, technology etc
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Fig. 1 shows the structure diagram for the Metro Passenger information processing system that the embodiment of the present invention one provides.Referring to Fig. 1,
In one embodiment, Metro Passenger information processing system may include that control centre 100, station communication subsystem 200, train are logical
Letter subsystem 300, cable network subsystem (figure is not marked) and car-ground radio subsystem (figure is not marked).
Wherein, the cable network subsystem, for being the control centre 100 and the station communication subsystem 200
Between external network, video and data-signal transmission channel are provided.The car-ground radio subsystem, for being communicated for the station
Subsystem 200 and the train communication subsystem 300 provide external network, video and data-signal transmission channel.The control
Center 100 includes at least two core switch, by least two core switch to the station communication subsystem
200 transmission external networks, video and data-signal.The station communication subsystem 200 is by external network, video and data-signal
It is sent to the train communication subsystem 300.
Above-mentioned Metro Passenger information processing framework, the cable network subsystem center 100 and station communicator in order to control
External network, video and data-signal transmission channel are provided between system 200, the car-ground radio subsystem is station communicator
System 200 and train communication subsystem 300 provide external network, video and data-signal transmission channel, control centre 100 with it is outer
Portion's network interconnection and by least two core switch to station communication subsystem 200 transmit external network, video and
External network, video and data-signal are sent to train communication subsystem 300 by data-signal, station communication subsystem 200, from
And realize while transmitting external network service and PIS related services, and it is simple in structure, equipment management complexity can be reduced and set
Standby failure rate.
In one embodiment, external network includes internet WIFI (WIreless-Fidelity, Wireless Fidelity), but simultaneously
It is not limited.It is logical that control centre 100 and station communication subsystem 200 are connected to the transmission that the cable network subsystem provides
On road, station communication subsystem 200 and train communication subsystem 300 are connected to the transmission that the car-ground radio subsystem provides and lead to
On road, to constitute a complete information transmission path.
Preferably, the backboard of every core switch is passive backplane, so as to avoid the core from exchanging
There is Single Point of Faliure in the cabinet of machine.
The Primary Component (such as engine, power supply, fan and corsspoint switch matrix) of every core switch is superfluous
Remaining structure.Wherein, it sets the Primary Component of every core switch to redundancy structure, can further ensure the core
The high reliability of heart interchanger.And realize that forwarding is not interrupted in 10,000,000,000 data services when switching with double engines, it can effectively ensure that network
Stablize.
The veneer of every core switch is the veneer with warm connection function, when the core switch works
It can plug or pull out, and not influence each other between each veneer.Likewise, the power module of every core switch
For the power module with warm connection function, it can plug or pull out when the core switch works.There is heat to insert for setting
The veneer and power module for pulling out function can improve the ease for use and convenience of the core switch.
Further, every core switch can run RERP (Fast Ethernet environmental protection agreement), and
IPv4/IPv6 Routing Protocols and multiprotocol label switching function are extended on RERP networks, so as to merge SDH
(Synchronous Digital Hierarchy, the synchronous digital system) high reliability of fault self-recovery and the economy of Ethernet
Property, the advantages such as high bandwidth, can ensure the fail-over time for being less than 50ms under ten thousand megaline speed service conditions, ensure voice, regard
The real time business such as frequency are not influenced by network convergence.
Preferably, every core switch is all made of Graceful Restart technology, when switching to provide ultra-short Time
Between, further increase the performance of the core switch.For example, OSPF/IS- may be used in every core switch
The Graceful Restart technology of IS/BGP, is capable of providing the switching time of Millisecond.
Every core switch also passes through ECMP (Equal-CostMultipathRouting, equal cost multipath)
And/or WCMP (Weighted Cost Multipath weight multipath) uses multilink, can not only increase transmission belt
Width, and the data transmission of failed link can without packet loss be backed up without time delay, realize the load balancing and redundancy backup of flow；
It supports the protection mechanisms such as dynamic routing protocol, straddle port trunking, Virtual Router Redundacy Protocol (VRRP), the whole network height is effectively ensured
Fast reliability service.
Further, every core switch runs a variety of multicasting technologies, with when providing multicast services to band
Width carries out reasonable distribution, and the illegal multicast source of shielding.Specifically, the multicasting technology includes but not limited to：IGMP
Snooping (Internet Group Management Protocol Snooping, internet group management protocol snooping),
IGMP (Internet Group Management Protocol, Internet igmpinternet), PIM (Protocol
Independent Multicast, Protocol Independent Multicast) and DVMRP (Distance Vector Multicast Routing
Protocol, distance vector Multicast Routing select agreement) etc..Using a variety of multicasting technologies, can ensure to provide multicast in network
Bandwidth when service rationally occupies.Meanwhile every core switch can pass through the inspection of IGMP source ports, source IP inspection
With the illegal multicast source of igmp filtering functional shielding.
In addition, every core switch can also be according to various QoS (Quality of Service, service quality)
Technology carries out flexible flow point class.Specifically, can be according to IP Precedence, 802.1P and DSCP (Differentiated
Services Code Point, differentiated services code points) flow point class is carried out, it can also be according to expert grade ACL (Access
Control List, accesses control list), IP extended acls, IP standard ACLs, MAC (Medium Access Control, physics
Address controls) extended acl etc. carries out flow point class.
In the present embodiment, control centre 100 is connect by gigabit interface with the cable network subsystem.Control centre
100 are interconnected by firewall box and egress router with external network (such as because of special internet).The cable network subsystem
Proprietary Network Management System is selected to realize automatic monitoring and management to the network equipment.Control centre 100 is adopted by interface
Collect external information, by, into edlin and processing, generating internal information, and broadcast by preset rules or format to external information,
To achieve the purpose that transmit information to passenger, also the signal of passenger WiFi can be sent to egress router, go to internet.
In the present embodiment, control centre 100 can function include：Realize the interface with oracle；Acquisition information,
Various types of data in processing system；Management/control system equipment；Editor generates and broadcasts format；It formulates and plays priority level；It broadcasts
The statistical analysis of information；Security mechanism is provided；It is responsible for the conversion of video flowing and the broadcasting of various information；Monitor vehicle profession
The train passenger compartment video monitor image of offer；The working condition of monitoring control network and terminal device；It is responsible for system failure repair
Centralized management, it is ensured that system normal operation.
In one embodiment, the station communication subsystem 200 may include more trolley stations interchanger.Every station
Switch configuration has multiple (such as 100) 10/100Base-TX ethernet ports, at least one (such as two)
1000Base-X SFP gigabit ethernet ports and at least one (such as two) 10/100/1000MBaseT interfaces.The vehicle
Interchanger of standing has three complete layer functions, supports RIP (Routing Information Protocol, routing iinformation association
View), RIP2, OSPF (Open Shortest Path First, ospf), policybased routing, IGMP
SNOOPING agreements and PIM SM/DM.
Preferably, the oversized frame of the station interchanger is more than or equal to 1518 byte/frames.Each station is exchanged
Traffic mirroring is arranged between this station interchanger and standdle carrier station interchanger in machine.The station interchanger can also carry out port
Unidirectional link failure detects.The multicast list of three layers of the station interchanger is more than 1K.
In one embodiment, the car-ground radio subsystem may include wireless controller, be arranged beside underground railway track
Multiple first wireless access points and setting multiple second wireless access points ON TRAINS.Referring to Fig. 2, this implementation
In example, the wireless controller can be arranged in control centre, in order to be concentrated to first wireless access points
It is uniformly controlled.It can be completed under the version updating to first wireless access points, configuration by the wireless controller
Hair and single order such as issue at the work.In Fig. 2, the first wireless access points include uplink trackside AP
(WirelessAccessPoint, wireless access points) and downlink trackside AP, the second wireless access points are vehicle-mounted bridge joint
AP。
Specifically, being FIT architecture modes between the wireless controller and the multiple first wireless access points.Institute
State between multiple second wireless access points is FAT architecture modes, the second wireless access points of deduction and exemption and the wireless controlled
Device processed is attached, and establishes tunnel to the link for re-issuing configuration.The multiple first wireless access points and described more
It is FAT architecture modes between a second wireless access points, the multiple second wireless access points can be reduced and gone offline
The time interval reached the standard grade again.The wireless controller can be independent rack formula equipment, and the wireless controller is more, every
The wireless controller can manage 1024 the first wireless access points.
As a kind of embodiment, can the first wireless access points and antenna completely be set along trackside again, every
It plows train head and the second wireless access points and antenna is respectively set in the tailstock.First wireless access points are received by optical fiber
It sends out device to interconnect with station interchanger, realizes wire and wireless intercommunication.
Preferably, when the underground railway track is straight line, each first wireless access points spaced first
Pre-determined distance；When the underground railway track is curve, each first wireless access points spaced second it is default away from
From；First pre-determined distance is more than second pre-determined distance.
Specifically, the first wireless access points can be operated in 5.8G frequency ranges, straight tunnel is generally at interval of 200 meters of cloth
If first wireless access points, is used according to actual conditions in bend or ground and lay one at interval of 160 meters or 180 meters
A first wireless access points, the second wireless access points use directional aerial.
In addition, control centre 100 is in addition at least two core switch, can also include centered video server, application
Server, hub-interface server, vehicle mounted multimedia forwarding server, application server, central server (multi-host hot swap), in
Heart monitor workstation, center network management workstation and center operations employee's work station.
Above-mentioned Metro Passenger information processing framework, the cable network subsystem center 100 and station communicator in order to control
External network, video and data-signal transmission channel are provided between system 200, the car-ground radio subsystem is station communicator
System 200 and train communication subsystem 300 provide external network, video and data-signal transmission channel, control centre 100 with it is outer
Portion's network interconnection simultaneously transmits external network, video and data by least two core switch to station communication subsystem
External network, video and data-signal are sent to train communication subsystem 300 by signal, station communication subsystem 200, to real
In a present physical network, while passenger's external network service and PIS related services are transmitted, and mutual not shadow between the two
Sound, security domain, failure domain are kept completely separate, and the architectural configurations are simple, can effectively reduce equipment management complexity and equipment event
Barrier rate.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
It, can also be above-mentioned integrated during two or more units are integrated in one unit to be that each unit physically exists alone
The form that hardware had both may be used in unit is realized, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are also only to facilitate mutually distinguish, the protection domain being not intended to limit this application.Above system
The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device, it can be real by another way
It is existing.For example, system embodiment described above is only schematical, for example, the division of the module or unit, only
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING or communication of device or unit connect
It connects, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, the technical solution of the embodiment of the present invention
Substantially all or part of the part that contributes to existing technology or the technical solution can be with software product in other words
Form embody, which is stored in a storage medium, including some instructions use so that one
Computer equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute this hair
The all or part of step of bright each embodiment the method for embodiment.And storage medium above-mentioned includes：USB flash disk, mobile hard disk,
Read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic
The various media that can store program code such as dish or CD.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to aforementioned reality
Applying example, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each
Technical solution recorded in embodiment is modified or equivalent replacement of some of the technical features；And these are changed
Or replace, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of Metro Passenger information processing framework, which is characterized in that logical including control centre, station communication subsystem, train
Believe subsystem, cable network subsystem and car-ground radio subsystem；
The cable network subsystem, for providing extranets between the control centre and the station communication subsystem
Network, video and data-signal transmission channel；
The car-ground radio subsystem, for providing extranets for the station communication subsystem and the train communication subsystem
Network, video and data-signal transmission channel；
The control centre interconnects with external network, including at least two core switch, is handed over by least two cores
It changes planes to station communication subsystem transmission external network, video and data-signal；
External network, video and data-signal are sent to the train communication subsystem by the station communication subsystem.
2. Metro Passenger information processing framework according to claim 1, which is characterized in that the car-ground radio subsystem packet
Include wireless controller, multiple first wireless access points for being arranged beside underground railway track and setting ON TRAINS multiple the
Two wireless access points.
3. Metro Passenger information processing framework according to claim 2, which is characterized in that the wireless controller with it is described
It is FIT architecture modes between multiple first wireless access points, is FAT framves between the multiple second wireless access points
Structure pattern is FAT framework moulds between the multiple first wireless access points and the multiple second wireless access points
Formula.
4. Metro Passenger information processing framework according to claim 2, which is characterized in that the first accessing wirelessly access
Point is connected by fiber optical transceiver with the station interchanger of the station communication subsystem.
5. Metro Passenger information processing framework according to claim 2, which is characterized in that the underground railway track be straight line
When, each spaced first pre-determined distance of first wireless access points；It is each when the underground railway track is curve
Spaced second pre-determined distance of first wireless access points；
First pre-determined distance is more than second pre-determined distance.
6. Metro Passenger information processing framework according to claim 1, which is characterized in that every core switch
Backboard is passive backplane；
Engine, power supply, fan and the corsspoint switch matrix of every core switch are redundancy structure；
The veneer of every core switch is the veneer with warm connection function；
The power module of every core switch is the power module with warm connection function.
7. Metro Passenger information processing framework according to claim 1 or 6, which is characterized in that every core exchanges
Machine runs Fast Ethernet environmental protection agreement, and IPv4/IPv6 routings association is extended on the Fast Ethernet environmental protection protocol network
Negotiation multiprotocol label switching function.
8. Metro Passenger information processing framework according to claim 7, which is characterized in that every core switch is equal
Using Graceful Restart technology；
It is reasonable to be carried out to bandwidth when providing multicast services that every core switch can run a variety of multicasting technologies
Distribution, and illegal multicast source is shielded by least one of the inspection of IGMP source ports, source IP inspection and igmp filtering function.
9. Metro Passenger information processing framework according to claim 1, which is characterized in that the control centre passes through fire prevention
Wall equipment and egress router are connected with external network.
10. Metro Passenger information processing framework according to claim 1, which is characterized in that the station communication subsystem
Including station interchanger；The station switch configuration has multiple 10/100Base-TX ethernet ports, at least one
1000Base-X SFP gigabit ethernet ports and at least one 10/100/1000MBaseT interfaces.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113973046A (en) * | 2021-09-06 | 2022-01-25 | 交控科技股份有限公司 | Wired safety data network and train-ground communication mobile block signal network for train operation station |
| CN113973046B (en) * | 2021-09-06 | 2024-05-03 | 交控科技股份有限公司 | Wired safety data network and train ground communication mobile blocking signal network for train operation station |
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| CN113973046A (en) * | 2021-09-06 | 2022-01-25 | 交控科技股份有限公司 | Wired safety data network and train-ground communication mobile block signal network for train operation station |
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