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(1) Exclusion method: 
(2) Comparison method: 
(3) Replacement method: 
Switch eliminates all difficulties
Switch failures are varied and different failures have different manifestations. In the analysis of failures, it is necessary to flexibly apply exclusion methods (such as exclusion, comparison, and replacement) through various phenomena to find out where the faults are and eliminate them in time.
When we face the phenomenon of failure and analyze the problem, we inadvertently learned to use the elimination method to determine the direction of the failure. This method refers to listing all possible faults as comprehensively as possible based on observed fault phenomena, and then analyzing and eliminating them one by one. When excluding it, we must follow the principle of simplicity and complexity to increase efficiency. Using this method can handle a variety of faults, but maintenance personnel need to have a strong logic of thinking, a comprehensive understanding of the switch knowledge.
The so-called contrast method is to use the existing, the same model and the normal operation of the switch as a reference object, and the fault switch to compare, in order to identify the point of failure. This method is simple and effective, especially the fault on the system configuration, simply compare the configuration can find the differences, but sometimes find a model with the same configuration and the same switch is not an easy task.
This is the most common method we use. It is also a method that is used more frequently in computer maintenance. Replacement refers to the method of using a normal switch component to replace a component that may be faulty to find the point of failure. It is mainly used for the diagnosis of hardware faults, but it should be noted that the replaced parts must be the same brand, the same type of the same switch.