| 摘要 |
This communication device (10a) comprises: a plurality of ports (24-1a, 24-2a) to which cables for communicating with a partner device (10b) are connected; a light-emitting unit (23-1a) for notifying an operator of whether or not there is a wrong connection in the cables; a communication processing unit (21-1a) which, when a cable is connected to at least one port among the plurality of ports, transmits/receives a communication frame for determining whether or not connection at a data link layer level is good to/from the partner device (10b) via the cable at regular intervals; and a connectivity verification unit (22a) which, with reference to a preregistered set value and the communication frame received from the partner device, determines whether or not there is a wrong connection with the partner device (10b) at the data link layer level, and when determining that there is a wrong connection, turns on the light-emitting unit (23-1a). |
