Patent ID: 6532274
Filing Date: 2003-03-11
Classification: H04J,H04L

Abstract:
A method of synchronizing at least one local oscillator with a central time-generating unit, where said local oscillator serves an element included in a network, and where said time-generating unit is included in a main unit which is also included in said network, comprising the steps of:controlling the frequency of said local oscillator by periodic and automatic calibration, wherein the time-generating unit sends a time stamp at pre-defined time intervals; evaluating the transmission time of said time stamp from said main unit to a respective element with a given degree of certainty by evaluating against well defined physical requirements of that part of said network including said main unit and said elements, and wherein the network is a delimited network; and, using the inter-arrival time of the time stamps to calibrate the local oscillator together with a known transmission time, wherein said transmission time is evaluated with necessary certainty by giving said time stamps the highest priority over all other information transmissions within said delimited network.