Transmission system, transmission device, packet loss ratio measurement method, and packet loss ratio measurement program

摘要

In a transmission system capable of measuring packet loss ratio between arbitrary devices upon a transmission path without increasing bandwidth of an OAM frame band, a plurality of transmission devices which have been disposed upon a transmission path are provided with a frame analysis unit which receives data frames so as to analyze the type of the data frames, a count processing unit which stores the number of received frames included in the data frames into storage module provided beforehand, an output line end portion which outputs the data frames, and an OAM processing unit which calculates the packet loss ratio in the transmission path using the number of received frames. The frame analysis unit has a function which, if the data frames are OAM frames, copies the data frames and the OAM processing unit has a function which calculates the packet loss ratio using the copied OAM frames.

主权项

1. A transmission system comprising, on a transmission path, a plurality of transmission devices which transmit a data frame received from another device to a next device, thereby sequentially transmitting the data frame on the transmission path, wherein each of the transmission devices comprises:
a frame analyzer configured to receive the data frame transmitted from another device via the transmission path and to analyze a type of the data frame; a count processor configured to store a received frame number contained in the data frame to a storage module provided in advance; an output line end portion configured to output the data frame towards the next device; and an Operations, Administrations, Maintenance (OAM) processor configured to calculate a packet loss ratio on the transmission path by using the received frame number, wherein the frame analyzer includes a function which, when the data frame comprises an OAM frame, copies the OAM frame, and wherein the OAM processor includes a function which calculates the packet loss ratio on the transmission path by using the copied OAM frame and the received frame number stored in the storage module.