Views: 84 Author: Site Editor Publish Time: 2020-02-11 Origin: Site
Because the excessive temperature is fatal to the industrial-grade interchanger, when designing such products, in addition to choosing a wide temperature range of industrial-grade components such as the heatsink, it must be paid more attention to the thermal design of the equipment.
The fan of the commercial-grade interchanger has been in full-speed (Full SPD) state, which not only causes waste of power, increases noise of the whole machine, but also increases unnecessary power supply heating, excessive dust accumulation in the chassis, etc. More importantly, the fan has a life of about 20,000 hours at full speed. After 20,000 hours, the fan speed will gradually decrease, which will bring instability to the whole machine. Because there is no monitoring unit, it is difficult to find the hidden danger. For example, when the packet loss rate of the interchanger increases gradually, it is not easy to find that the temperature of the key components in the chassis rises because of fan aging and dust accumulation.
Industrial-grade interchangers should use high-speed (High SPD) fans with intelligent monitoring circuits to monitor and control the operation of network interchangers in real time, such as monitoring chassis fan temperature, main interchanger chip temperature, chassis temperature, optical transceiver temperature, etc. During the working process of the industrial-grade interchanger, the intelligent monitoring circuit automatically adjusts the fan speed according to the temperature of the component under test or the fan speed signal to dissipate heat to the network interchanger. The fan speed is primarily related to the interchanger load and ambient temperature. When the ambient temperature is constant, when the data load of the industrial-grade interchanger is reduced, the power consumption is reduced, and the fan speed will be automatically reduced. When the data load is constant, when the industrial-grade interchanger is in a low temperature environment, the fan speed is automatically reduced. When the industrial-grade interchanger is in a high temperature environment, the fan speed automatically increases. Under high temperature and high load conditions, the fan can be in the high speed (High SPD) state, which can ensure the safe operation of the network than the full speed (Full SPD) state.
The use of intelligent fan control technology can extend the life of the fan, reduce dust accumulation inside the machine, reduce fan noise, save power consumption, and ensure the system works effectively. In addition, the controller can not only provide alarm for fan failure stop and temperature exceeding the warning line, but also give corresponding Chinese and English voice prompts for early hidden dangers, such as the aging, abnormal increase of air duct resistance, speed lower than normal value or abnormal increase of temperature at monitoring point, so as to facilitate network managers to eliminate the accident in the bud stage.
In summary, due to the particularity of the environment in which the industrial-grade interchanger is located and the speciality of use, the countermeasures adopted in dealing with high and low temperature, mainly high temperature environment, are different from ordinary interchangers.
(1) In the case of lower power, when power is less than 10W, try not to use fan cooling, the natural heat dissipation should be adopted. If natural convection is adopted, it can be increased the shell area, casing wrinkles, or used heat-conducting profiles, such as aluminum.
(2) In the case of large power, when power is greater than 15W, especially when there are multiple light ports, or even multiple single-mode light ports, when the problem of heat dissipation can not be solved by natural heat dissipation, the active heat dissipation should be adopted to solve the problem. At present, active heat dissipation means installing fans, but due to the particularity of industrial-grade interchangers that can not stop and have to run for a long time, the use of fans should be considered as follows:
1) Fan is different from ordinary electronic equipment fan, it should be intelligent. The intelligent fan in service life and function is qualitatively different from ordinary fan.
2) The intelligent fan should be designed to be hot-swappable, that is, if the system does not stop and the intelligent fan system alarms, the fan can be replaced online. By adopting the above thermal design and heat dissipation measures, the MTBF of the network equipment can be greatly improved, and the life of the network equipment can be greatly extended, thereby making the industrial-grade heat interchanger work in a "stable and comfortable" temperature environment for a long time, thus ensuring the stability and reliability of the communication system in the automation process.
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