OLT equipment temperature overheating protection circuit and method

Abstract

The invention discloses an OLT (Optical Line Terminal) equipment temperature overheating protection circuit and method. The protection circuit comprises a CPU (Central Processing Unit), a first temperature chip, a second temperature chip, a CPLD (Complex Programmable Logic Device) module, a first fan system, a second fan system and a system power supply, the CPLD module serves as I2C main equipment to read the temperature value of the second temperature chip, the temperature value is compared with an internal preset target value, when the read value is larger than the target value, it is judged that the system is overheated, and the CPLD module will control a system power source to be powered off and meanwhile control a second fan system to work for cooling; when the read value is smaller than the target value, the CPLD module can control the system power supply to restore power supply and meanwhile control the second fan system to stop working; and meanwhile, the CPLD module can inform the CPU that the overheating condition just occurs through a predetermined pin level change, and then the CPU reports an overheating alarm signal to the control platform. According to the invention, when the fan of the OLT equipment is abnormal, the OLT equipment can still work normally.

Description

technical field [0001] The invention relates to the technical field of overtemperature protection, in particular to an OLT equipment temperature overheat protection circuit and method. Background technique [0002] The optical access network is an access network with light as the transmission medium, which replaces copper wires and is used to access every home. It consists of three parts: OLT (Optical Line Terminal, Optical Line Terminal), ONU (Optical Network Unit, Optical Network Unit) and ODN (Optical Distribution Network, Optical Distribution Network). Among them, OLT is the core component of the optical access network. It is a switch or router in a traditional communication network, and it is also a platform for providing multiple services. For an OLT device, the business volume and bandwidth flow are very large, the internal circuit is complex, and the PON chips, switching chips, and CPUs used in the device are all devices with high power consumption and high heat gen...

AI Technical Summary

Problems solved by technology

For an OLT device, the business volume and bandwidth flow are very large, the internal circuit is complex, and the PON chips, switching chips, and CPUs used in the device are all devices with high power consumption and high heat generation. The power consumption of an OLT is generally Some of the above 50W can even reach 150W, so heat dissipation is extremely important. The heat dissipation of the OLT can only be dissipated by the fan on the device. When the fan fails and cannot operate normally, the temperature of the device will continue to rise beyond the critical operating temperature of the CPU. , leading to potential problems such as CPU not working properly or even chip damage

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