Patent ID: 8611206
Filing Date: 2013-12-17
Classification: H04L

Abstract:
1. A failure-section determining device that is located between a relay device and a receiving device, the relay device being located between a sending device and the receiving device, the failure-section determining device comprising: a data receiving unit that sequentially receives data assigned with a serial number by the relay device; a receiving-time acquiring unit that acquires a receiving time of the data received by the data receiving unit; a loss determining unit that calculates a receiving-time interval using the receiving time and a receiving time of immediately previous data, determines that a loss occurs when the receiving-time interval is a predetermined threshold or higher, and calculates the number of losses using the receiving-time interval and a data sending-time interval; a serial-number acquiring unit that acquires the serial number of the data received by the data receiving unit; and a failure-section determining unit that calculates the number of losses occurring in a first section between the sending device and the relay device, using the serial number acquired by the serial-number acquiring unit and a serial number of an immediately previous packet, and calculates the number of losses occurring in a second section between the relay device and the monitoring device, using the number of losses calculated by the loss determining unit and the number of losses occurring in the first section.