Patent ID: 7936700

Claim:
A delay time measuring method of an echo request/response in an RPR (Resilient Packet Ring) system for measuring delay time of the echo request/response between a measuring station and a station to be measured on a bilateral dual ring network by using an OAM (Operations, Administration, and Maintenance) echo testing function in the RPR system, comprising: a first step of said measuring station adding a “request transmitting time” showing time at which an OAM echo request/response frame has been transmitted to the OAM echo request/response frame and sending out the OAM echo request/response frame with the added “request transmitting time” to said station to be measured; a second step of said station to be measured receiving the OAM echo request/response frame with the added “request transmitting time” transmitted from said measuring station and transmitting to return the received OAM echo request/response frame to said measuring station; a third step of said measuring station adding further, when the OAM echo request/response frame transmitted to be returned from said station to be measured has been received, a “response receiving time” showing time at which the OAM echo request/response frame returned from said station to be measured has been received to the returned OAM echo request/response frame and storing the returned OAM echo request/response frame with the further added “response receiving time” in a data buffer; and a fourth step of said measuring station measuring delay time of the echo request/response between said measuring station and said station to be measured by reading the returned OAM echo request/response frame stored in said data buffer and extracting the “request transmitting time” and “response receiving time” from the read returned OAM echo request/response frame, wherein the delay time is measured for an individual service class by changing a service class in a process of encapsulating an OAM echo.