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Abstract At present Taiwan all networks serve the entrepreneur (for example Seednet, Sonet, Ssparq, the Taiwan fixed network And so on) still rents the Chinese telecommunication the network to sublet again for the user, this article take the Chinese telecommunication as an example, explains between HOST and the user the long distance is unable for to install the network or the long distance is unable for to install the high speed network, Also to enhance the user surfer, the transmission service quality with to meet the need which the user accesses the net high speed,Therefore many users all used Remote DSLAM for to install the way, This also lets the outdoors RD the box therefore massive and rapid increase. Taiwan because of the climate relations, is frequent March to September thunderstorm, Because the RD box''s leakage circuit breaker is often struck by lightning, therefore the interrupt, causes the equipment to lose the association, not only creates the customer many inconveniences, transmission service quality reduction, also causes the user barrier enter charges against quantity the large promotion, The maintenance of equipment personnel bustle about, therefore, after only then wants the research and development leakage circuit breaker interrupt, may the self-recovery electric circuit, except may let lose the association the equipment to restore rapidly, reduces the user network barrier time, may also save many time、the manpower、the physical resource. The “ self-recovery control circuit “ is with 8051 microcontroller , controls by the assembler programming language, Its major function has two,one to work as when leakage circuit breaker down , can let the broadband devices in the short time be rapid resumes the power supply, two for, when devices leakage or other factors cause the circuit breaker incessant down, and the control circuit starts unceasingly in the situation can control lets the electric circuit enter the locking condition, when the continual three time interval of time is lower than 30 seconds , in order to prevent the electric circuit damage and the devices overburning. Key Words: self-recovery control circuit;8051 microcontroller
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