Signal transmission device, signal transmission system, and information provision method

A signal transmission system comprising:

• a first electronic device;
• and
• a second electronic device connected to the first electronic device via a differential wiring including a pair of electric wires, wherein
• the first electronic device includes
• a pair of first signal wirings connected to the differential wiring,
• a first communication unit that performs communication using differential transmission with the second electronic device via the first signal wirings and the differential wiring,
• a first power supply unit that supplies a power supply current via the differential wiring, and
• a first filter circuit that includes a pair of filter elements respectively connected between the pair of first signal wirings and the first power supply unit,
• the second electronic device includes
• a pair of second signal wirings connected to the differential wiring,
• a second communication unit that performs communication with the first electronic device via the second signal wirings and the differential wiring,
• a second signal processing unit that performs signal processing related to the communication,
• a second power supply unit that supplies the power supply current via the differential wiring, and
• a second filter circuit that includes a pair of filter elements respectively connected between the pair of second signal wirings and the second power supply unit,
• the first communication unit transmits communication signals at each of a plurality of signal transmission rates including at least a first signal transmission rate and a second signal transmission rate lower than the first signal transmission rate,
• the second communication unit receives the communication signals transmitted from the first communication unit via the differential wiring and measures an amplitude of the communication signals received at the second signal transmission rate, and
• the second signal processing unit detects a short-circuit failure of the first filter circuit or the second filter circuit on the basis of the amplitude measured by the second communication unit.