Patent ID: 9264332
Filing Date: 2016-02-16
CPC Classification: H04L

Claim Text:
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.