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A clock synchronization system and method in a communication network comprise a plurality of nodes in communication with each other by data transfer over communication links. Each of the nodes has its own local time base and exchanges timing information with a predefined node called master whose time base is the master clock against which said local time base is to be synchronized. At predefined moments in time, each node having a master exchanges timing information with the master node, calculates therefrom a timing data and stores said timing data into a predefined storage location called History; such as to obtain after at least two exchanges, a sequence of timing data stored in the History. From said sequence of timing data, a set of parameters is calculated and stored. The stored parameters are further used for computing a conversion function whereby the node local time is converted upon request …