A METHOD FOR SYNCHRONIZING DISTRIBUTED CLOCKS BY THE PRECISION TIME PROTOCOL, IN A TELECOMMUNICATION NETWORK

摘要

The method comprises the steps of: - sending a Sync message (SYNC) from a first peer-to-peer transparent clock (P2P TC B) to a second peer-to-peer transparent clock (P2P TC C), - estimating the path delay of the transmission path travelled by the synchronization message from the first to the second peer-to-peer transparent clocks, - and then taking this path delay into account for updating the time information carried by a synchronization message. For estimating said path delay, it comprises the steps of: - creating a list of the network addresses of the network interfaces (IPRB, IPRI1, IPRI2, IPRC) traversed by the synchronization message (SYNC); - ordering the first list into the order in which the network interfaces have been traversed by the Sync message (SYNC); - creating a second list by reversing the order of the first list; - communicating the second list to the second peer-to-peer transparent clock (P2P TC C); - and using the mechanism available at the transport protocol level, to constrain the respective paths of Pdelay_Req and Pdelay_Resp messages so that their respective paths map to the second and first ordered lists of traversed interfaces.