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 lis ts of traversed interfaces.