Patent ID: 9203725
Filing Date: 2015-12-01
Classification: H04J,H04L

Abstract:
1. A method for updating a cumulative residence time of a synchronization packet received at a node of a packet-switched communication network, said method comprising: a) receiving said synchronization packet an ingress circuit of said node having associated said cumulative residence time equal to a cumulative sum of residence times of said synchronization packet at nodes of said packet-switched network interposed between a further node which has generated said synchronization packet and said node; b) receiving said synchronization packet at said egress circuit from said ingress circuit and to transmit it to a still further node of said packet-switched communication network; c) at an egress timestamp generator of said egress circuit, generating an egress timestamp; d) at said egress circuit, calculating a virtual timestamp based on said egress timestamp and on an estimated variable delay that will be undergone by said synchronization packet due to buffering in a buffer located downstream said egress timestamp generator; and e) at said egress circuit, using said virtual timestamp for updating said cumulative residence time, before transmitting said synchronization packet to said still further node.