Emerging networks destined to handle voice, data and Internet Protocol (IP) traffic benefit from a reliable, high accurate distributed time service. In most cases, the end-to-end communication path requires tuning and continuous maintenance to achieve acceptable quality for service integration. Several sources of latency, as they are protocol processing, system transfer rates and frame forwarding mechanisms within a local network communication path are beneath notice or remain undiscovered. Assessing these parameters as well as simultaneous triggering of events and synchronous data acquisition at several nodes is impossible without tight clock synchronization
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