It may need a tremendous amount of electronic devices to build a complete video surveillance system, together with the complicated cabling networks that connecting all the equipment. This may amplify the bandwidth and the power of the electromagnetic energy and affect the total performance of the system.
It may need a tremendous amount of electronic devices to build a complete video surveillance system, together with the complicated cabling networks that connecting all the equipment. This may amplify the bandwidth and the power of the electromagnetic energy and affect the total performance of the system. Therefore, electromagnetic compatibility of the electronic equipment should not be negligible when the video surveillance system is applied to environments with high-voltage current, such as power plant, factory, transportation and infrastructure.
Electromagnetic Compatibility (EMC) means the ability of the product to function normally in an electromagnetic environment and not to generate any unwanted electromagnetic energy to any equipment in the environment. The definition of EMC contains two regulations. First, the ability of avoiding the influence of the electromagnetic environment is EMS (Electromagnetic Susceptibility). Second, the avoidance of generating electromagnetic energy which may interfere other equipment is EMI (Electromagnetic Interference).
In addition to its basic functions, a high standard EMC design is also a key index of quality and performance of an excellent network product. At the meantime, EMC of the PCB and the IC are also needed to be taken into consideration. Taking substations for example, when the high-voltage convertor, circuit breaker and relays are operating, they will step up the voltage to several hundred thousand, which may generate huge electromagnetic interference to the equipment in the substation, and cause unpredictable damages.
Transportation systems such as train and subway are operated by electric power. The electromagnetic interference can be sorted by environments outside the cabin, the electronic equipment in the cabin, the main transformer substation and the backup transformer substations along the rail and other electrical substations. The main electrical system provides the power for the cars to operate on. The auxiliary power system processes the electrical power and distribute to electronic equipment on the cars. Due to the fact that the on board units on the trains have higher output, besides avoiding the EMI of other equipment, it is also crucial to avoid the huge electromagnetic radiation generated by the train itself. When video surveillance is applied to such a complicated environment, the test of the electronic equipment will become more severe.
5 Key Considerations in Designing EMC Product:
1. Selection of components
The excessive heat comes from the electronic components in enclosed environment will increase the temperature in the housing. EtherWAN selects parts and passive components (resistor and capacitor) with high MTBF and wide temperature endurance range to ensure the products work normally in high temperature environment.
2. Professional Design of Circuit and PCB Board
Aiming at special EMS environment such as power plants and railways, the design of the circuit and PCB board focus on avoidance of surge current; therefore, rich experience in designing safe spacing and the circuit is necessary.
3. Test Levels and Strict Manufacturing Standards of Industry Grade and Commerce Grade products
EtherWAN insists that in the stage of design verification, regardless of commerce grade or industry grade, all the products will go through a long period burn-in test, to ensure the product can work under high workload environment.
4. Third Party Test Reports
EtherWAN's products have passed and obtain multiple third party certifications according to different requirements in different markets with harsh environment.
5. Highly Flexible Product Mix and Excellent After Service
EtherWan Ethernet switches provide highly flexible port number mix for different requirements on transmission speed and interface. EtherWAN offers 5 year guarantee on its products, with complete before-sale technical consulting and after service.
EtherWAN specializes in designing and manufacturing industry grade Ethernet products. For example, EX87000 Ethernet switch has passed the KEMA test, complied with IEC61850-3/IEEE1613 standards for substation and power automation, possessing remarkable Electromagnetic Susceptibility (EMS). EX83000 has passed EN50121-4 certificate for railway applications, complying with the regulations of electromagnetic protection, impact and shock in railway environment.
The new generation EX78900 hardened managed Ethernet switch possesses Electro-Static protection, fanless non-ventilated design and passed shock, impact and high and low temperature environment test. Each of the 8 Ultra PoE ports on EX78900 can supply 60 watt of power and the total output reaches 240 watt, which is suitable for high power devices such as PTZ camera and Thinclient computer.
All of the EtherWAN's industry grade Ethernet products comply with the endurance conditions to work normally between -40℃～75℃. EtherWAN Alpha-Ring self-healing technology, providing less than 15ms fault recovery time making it ideal for applications intolerant to interruption.