There is disclosed an animal-resistant wiring system. Distribution of the fluorescence emitted by the light emitting section corresponds to Lambertian distribution, and an incident angle of the laser beam with respect to an excitation light irradiated surface, which is a surface of the light emitting section irradiated with the laser beam, is set so that use efficiency of the fluorescence emitted by the light emitting section is increased. The effective width of the seat may be greater when it is in one position than when it is in the other position. An additional benefit of centrally locating the LC-to-CP interfaces on the connection plane is that the inter-LC channels extending between perpendicularly adjacent line cards are shortened, which increases server performance by virtue of reducing switching latency. The inner protrusion protrudes from the outer peripheral surface of the inner casing toward the outer casing. The embodiments include at least an error converter channel and a reference converter channel that can each amplify an analog input signal S with a fixed gain G and a programmed gain g and convert the amplified signal to a corresponding digital code.