Abnormality identification device and identification method

An abnormality identification device comprising:

• a first output unit that outputs first information representing transmission suitability of a transmission signal to be supplied to a communication channel;
• a second output unit that outputs second information representing reception suitability of a reception signal associated with the transmission signal arriving via the communication channel;
• and
• a third output unit that outputs third information representing signal suitability of a signal acquired by the reception signal, wherein
• the first information is related to presence and absence of the transmission signal,
• the second information is related to presence and absence of the reception signal,
• the third information indicates whether the reception signal includes a response signal to a predetermined sending signal, the response signal being sent to a transmission source of the transmission signal by a reception destination of the reception signal,
• the first output unit includes a first light emitting unit, and causes the first light emitting unit to emit first light for a first period by the first information,
• the second output unit includes a second light emitting unit, and causes the second light emitting unit to emit second light for a second period by the second information, and
• an abnormality suspected area is identified by a combination of the third information, a first on-status of the first light emitting unit, and a second on-status of the second light emitting unit.