Patent ID: 9571216
Date: 2017-02-14
CPC Classifications: H04J,H04L

Claim:
1. Method for managing an accurate distribution of time in a packet network comprising a plurality of network elements allowing packet transmission, the packet network comprising a peer-to-peer transparent clock hardware support in at least one network element, the peer-to-peer transparent clock being at least used in order to measure and correct delays of: path delays between two adjacent network elements of said packet network and; residence times in each traversed network element of said packet network, of time-stamped packets, this capability defining a peer delay mechanism, a Master/Slave end-to-end synchronization path comprising a first set of network elements and their associated peer-to-peer transparent clocks, the Master and Slave of the end-to-end synchronization path exchanging time stamped packets through the first set of network elements, each time stamped packet comprising at least a correction field indicating the cumulated transmission delay of the said packet along the end-to-end synchronization path, the correction field being updated by each network element of the first set, wherein the method comprises: detecting a failure by a first element of the first set in the end-to-end synchronization path between a first element and its upstream adjacent neighbour, both implementing a peer delay mechanism; storing by the first element a measured past peer delay of at least one previously transmitted time stamped packet received by the first element; calculating a new correction field value being a function of: