COMMUNICATION DEVICE AND DELAY DETECTION METHOD

摘要

The present invention is provided with: time stamp generators (142, 243) which generate time stamps when a PDU is transmitted or received; transmission data storage units (12, 22); reception data storage units (13, 23); frame processors (143, 244) which generate a PDU containing a data refresh command for another node, synchronous transmission data of the transmission data storage units (12, 22), and a frame transmission time acquired from the time stamp generators (142, 243), and when a PDU from the other node is received, the frame processors (143, 244) store, in the reception data storage units (13, 23), the synchronous transmission data contained in the PDU; and one-way delay detectors (145, 247) which determine whether there is a delay in the PDU from the other node on the basis of whether, when the PDU is received, the subsequent PDU is received within a first permitted delay time following the reception of the previous PDU, or whether, when the subsequent PDU is received within the first permitted delay time, the transmission time of the PDU from the other node to the actual node is within a second permitted delay time.