Patent ID: 7577169
Filing Date: 2009-08-18
Classification: H04J

Abstract:
1. A method of time stamping, the method comprising the steps of: a. initiating a time stamp request message at a lower data link layer of a requester wherein said data link layer is comprised of hardware which includes embedded processors to enable said data link layer of said requestor to perform Vernier interpolation; b. time stamping a transmit time of said time stamp request message at said lower data link level of said requester; c. recording an arrival time of said time stamp request message at a said lower data link level of a responder, wherein said data link layer is comprised of hardware which includes embedded processors to enable said data link layer of said requestor to perform Vernier interpolation; d. receiving said time stamp request message at said lower data link level of said responder; e. initiating a time stamp response message at said lower data link level of said responder; f. time stamping a transmit time of said time stamp response message at said lower data link level of said responder; g. recording an arrival time of said time stamp response message at said lower data link level of said requestor; h. receiving said time stamp response message at said lower data link level of said requestor; and i. adjusting a requester clock using a clock offset and path delay determined by equations utilizing the synchronization parameters Time