In the current “HD video mode” electronic police system, in order to alleviate the contradiction of frequent traffic accidents, less police force and high labor intensity of police officers caused by violation of regulations, and effectively restrain traffic accidents caused by human violations, such as speeding, retrograde, running red lights, no stopping, pressing yellow lines, and seizing bus lanes, electronic police can be used The system carries out accurate, stable, automatic, all-weather monitoring, law enforcement and punishment. AOBO provides a complete solution for the network transmission equipment of the electronic police system, which can effectively improve the road utilization rate and reduce the traffic accident rate, and effectively guarantee the illegal running of red lights by motor vehicles, so as to truly realize “scientific and technological management and strong police”. The following is the typical application of Aobo Industrial Ethernet switch in the sub police system, which optimizes the network solution of intelligent transportation.

1、 Overview of intelligent traffic electronic police

Automatic recording system for running red light

(automatic detection and recording system for crime of traffic signal, commonly known as electronic police): it can be installed at signalized intersections and road sections, and can continuously and automatically detect and record the red light running behavior of motor vehicles in the designated lane.

In the current “HD video mode” electronic police system, in order to alleviate the contradiction of frequent traffic accidents, less police force and high labor intensity of police officers caused by violation of regulations, and effectively restrain traffic accidents caused by human violations, such as speeding, retrograde, running red lights, no stopping, pressing yellow lines, and seizing bus lanes, electronic police can be used The system carries out accurate, stable, automatic, all-weather monitoring, law enforcement and punishment. AOBO provides a complete solution for the network transmission equipment of the electronic police system, which can effectively improve the road utilization rate and reduce the traffic accident rate, and effectively guarantee the illegal running of red lights by motor vehicles, so as to truly realize “scientific and technological management and strong police”. The following is the Aobo Industrial Ethernet switch in powerThe typical application of sub police system optimizes the network solution of intelligent transportation.

Typical application of industrial Ethernet switch in electronic police system

2、 Equipment requirements

The electronic police system needs to rely on the underlying Ethernet transmission channel to transmit the relevant captured pictures (videos) and other traffic data collected on the scene to the traffic police command center platform. But the electronic police, high-definition bayonet operation environment is relatively bad, must suffer from the sun and rain, as well as all kinds of motor vehicles caused by the strong magnetic field interference. Therefore, it is very important to build a stable Ethernet channel.

If the traditional commercial switches and low-end optical fiber converters are used, although it seems that some economic costs can be reduced in the short term, our cooperation with engineering companies has found that due to the unstable operation of traditional low-end commercial switches in the harsh external environment, the faults caused by dust accumulation, humidity, temperature and lightning strike may occur at any time It is difficult to ensure the system can work continuously because of the high cost in the later stage.

In addition, there are more and more uncertain factors in the field application, mainly reflected in the following aspects:

1) Insufficient transmission bandwidth

2) The stability of the equipment is not high

3) The EMC performance of the system is weak

4) The integration of system equipment is not high and there are many nodes

5) Poor resistance to harsh environment

6) Poor network redundancy

Therefore, the following problems need to be solved urgently

How to deal with strong electromagnetic interference?

How to make HD video stream smooth transmission?

How to reduce the number of exchange nodes and reduce the failure rate?

How to save network maintenance cost?

How to select the access switch flexibly according to the site situation?

3、 AOBO scheme

(1) Scheme introduction

The scheme is based on pure video detection mode, and the front-end system is mainly composed of embedded high-definition camera and led strobe light. The scheme is suitable for the intersection with large diameter (multi Lane), and the network topology is the star network structure formed by optical fiber trunk road. One Aobo g3009 (1 Gigabit light and 8 hundred megawatt) and three Aobo 3003 (1 optical and 2 electric) optical fiber transceivers (or Aobo 3005, depending on the number of cameras connected), are placed at the intersection near the monitoring center. The three 100m optical ports of the three Aobo 3003 near the intersection to the monitoring center are respectively connected with the 100MB optical ports of the Aobo 3003, and the three 100m electrical ports of the Aobo g3009 are respectively connected with the 100m electrical ports of the three Aobo 3003 at the intersection. The camera of the intersection is directly connected with the extra 100 MHz electrical ports of Aobo g3009, and then the captured monitoring video and pictures are passed through the Aobo The optical port of g3009 is uploaded to Aobo g7024 full Gigabit convergence switch to the monitoring command center. AOBO 3003 optical fiber transceivers at the other three intersections are used to access HD camera.

(Two)Features of the scheme

1. Using 100m access HD capture camera, Gigabit fiber bandwidth as the uplink, under the premise of controlling the networking cost, effectively ensure the smooth video transmission, can accommodate multiple groups of capture cameras, and realize multi lane detection.

2. All the network trunk roads adopt optical fiber medium transmission, which avoids the strong electromagnetic interference on the spot of electronic police, and solves the problem that the video stream transmission is not smooth due to the strong electromagnetic interference.

3. It adopts Aobo 3 series high reliable industrial Ethernet switch, solid aluminum alloy shell, no fan, low power consumption, which is very suitable for the harsh outdoor environment with strong electromagnetic interference, large temperature difference, high dust and humidity. It can effectively guarantee the long-term stable operation of the electronic police system.

4、 Related products

(1) AOBO 3003 guideway 100m Industrial Ethernet optical fiber transceiver

Installation position: it is installed in the distribution box at the intersection of all directions

Connection function: the Aobo 3003 100m electrical port at three intersections is connected with the front-end HD capture camera, the 100m optical port is connected with the Aobo 3003 100m optical port at another intersection, and the Aobo 3003 100m electrical port at the other intersection is connected with the 100MB electrical port of Aobo g3009

√ support 1 100m fiber port, 1 or 2 100m electrical interface

√ support IEEE 802.3/802.3u/802.3x

√ industrial standard design

√ in line with EMC industry level 4 standard

√ solid aluminum housing, fan free, industrial design

√ working temperature: – 40 ℃~ + 85 ℃

(2) AOBO 3005 5 5-port non network management 100m rail type industrial switch

Installation position: it is installed in the distribution box at the intersection of all directions

Connection function: the Aobo 3005 100MB electrical port at three intersections is connected with the front-end HD capture camera (when there are many cameras), and the 100m optical port is connected to the Aobo 3003 100m optical port at another intersection;

√ it supports 1 100m optical fiber port and 4 100m electrical interfaces

√ support ieee802.3/802.3u/802.3x

√ support 24 VDC redundant power input or 220 VAC AC input

√ working temperature: – 40 ℃~ + 85 ℃

√ industrial design, low power consumption, no fan

√ strong aluminum alloy shell, shock resistant and vibration proof

(3) AOBO g3009 nine port non network management rail type full Gigabit industrial switch

Installation position: it is installed in the distribution box at the intersection nearest to the control center

Connection function: the 100m electric port is used to connect the front-end HD camera and the 100m interface of three Aobo 3003, and the gigabit optical port is used to connect the Aobo g7024 Gigabit frame type core switch of the monitoring and control center;

√ provide 9 full Gigabit Ethernet ports for higher bandwidth access

√ support IEEE 802.3/802.3z/802.3ab/802.3x

√ industrial fan less dust-proof design, high reliability and stable operation

High strength sealed alloy shell, impact resistant, durable

√ extreme temperature adaptability and excellent EMC performance

(4) AOBO g7024 24g network management rack type full Gigabit industrial switch

Installation position: it is installed in the communication cabinet of the computer room of the monitoring and command center

Connection function: the gigabit optical port is used to connect the gigabit optical port of Aobo g3009 switch at the front-end intersection, and the Gigabit electric port is used to connect the electric police system servers and monitoring business hosts in the monitoring center

√ support up to 24 Gigabit Ethernet ports, especially suitable for Gigabit networks with high bandwidth service requirements such as video monitoring

√ support abring? High speed self-healing ring, self-healing time

√ support IGMP snooping, GMRP and static multicast

√ support VLAN, GVRP, QoS, RSTP, ACL and other functions

√ support port aggregation, port speed limit and broadcast storm suppression

√ support SNMP network management, web, Telnet, ABNET network management software and automatic topology

√ good EMC performance and adaptability to extreme temperature

Editor in charge: Tzh

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