Railroad crossing video surveillance solution for wireless systems

1. project background

Present at the main bus station of the train departure, many train road and highway traffic, cross, when the train passed by there will be traffic limit-bar to control the flow of traffic management, limitations, so that the train through a variety of emergency occurs.

The railway authorities hope to 24-hour real-time acquisition railway hongi video information, and save the database. At the same time because the scene environment bad sex, particularity, must put forward a set of Adaptive networking solutions for the industrial environment. Based on this demand, Beijing Yinghan pass network technology co., Ltd. has developed the following wireless solutions.

2. design basis

2.1 safety and feasibility of

Considering that video surveillance system is a data security requirements are higher in system design should take full account of data security issues, the selection of the equipment on the feasibility of measuring device oriented to ensure overall system security, you can run.

2.2 technology advancement and practicality

That meet the application, and to reflect the network system of the party.

In network design to advanced technology and existing mature technology and standards, full account of the status of network applications and future trends.

2.3 flexibilities and scalability

According to the needs of future applications and changes, should have full access and scalability, including a variety of access modes of provision and access scalability, bandwidth expansion and rate of smooth upgrade as well as the processing power of scalability, and minimize on network infrastructure and the adjustment of existing equipment.

2.4 manageability

Considering that the bottom of the video image acquisition point distribution between dispersed, maintenance difficulties of larger programmes using centralized management of network infrastructure, real-time monitoring and video processors running and accessible through the monitoring center to the next bit machine remotely setting.

2.5 environmental adaptability

Taking into account the working environment for the railway crossing, we use the industry-level monitoring terminal box to ensure that equipment is in stable operation under harsh environment.

2.6 compatibility and economy

Compatibility, maximum guarantee network existing computer software, hardware, resource availability and continuity; economics, in making full use of existing resources, minimizing network system's overall investment.

In a planned and systematic way, the overall performance of the network, making full use of existing network equipment or do the necessary upgrades.

3. network architecture description

3.1 system architecture diagram

Figure

3.2 network schema descriptions:

Center side network architecture description

Center side with public network environment, the outermost side of the settings there is a broadband VPN router (such as netscreen-25)

Client network schema description

The client is used primarily by control PTZ and monitoring terminal box, terminal box on the configuration of the video encoders and yinghan pass 3G router.

3G router via dial-up connection to the network, and TD-SCDMA monitoring centre a VPN devices establish a VPN connection for wireless transmission provides data security protection, * user video data through encryption algorithm for encryption, VPN tunnel protection transport, ensure the security of your data.

4. equipment selection

4.1 Center equipment selection

Centres network equipment is proposed to adopt Cisco or Juniper VPN router or firewall, use ADSL or fiber access, you need to have a fixed public IP address

4.2 selection in wireless communication equipment

Based on field work environment, we take the form of a terminal box ensure devices in harsh environments safe and stable operation.

Terminal box on the configuration of the video server and support TD-SCDMA network 3 g router that supports 3 g router TD-SCDMA network adopts Beijing Yinghan Tong technology co., Ltd products, models for InRouter600. The router uses standard Ethernet protocol, network routing, while using standard VPN (virtual private network) technology, complete remote network security Internet, standards-based machine to machine communication TCP/IP protocol. Based on VPN can offsite network over the Internet, establishing an encrypted tunnel, offsite network security on the Internet, building a virtual private network.

4.3InRouter600 key features:

Integrated 4-port 10/100Mbps Adaptive Fast Ethernet switching ports

Built-in TD-SCDMA Wireless modules, shared TD-SCDMA Wireless network of high-speed connection

Virtual private network (VPN), support for standards-based IPSec VPN service that supports the data package, encryption and authentication options including IPESP, 3DES, DES, AES, MD5 and SHA-1.

Stateful packet inspection (SPI) and denial of service (DoS) attack prevention, firewall security, in deciding what kind of packets to allow through SPI detects all before entered the packet's header content.

Filters can be set to become based on MAC address, IP address.

Network address translation (NAT) and port address translation (PAT), hide the internal IP address and develop Web site space

Support for virtual server and DMZ

Remote and local upgrade firmware, firmware backup function

Provide multilevel connection detection: always online, on-demand dialing.

Support

DTU features

Remote management, you can support OVDP management platform for remote management,

Industrial design, power supply terminals, rail mounting, 9-24VDC power supply, wide temperature range, support industrial fieldbus protocol MODBUS etc.