How to Distribute GPS-Time Over COTS-Based LANs
Ulrich Schmid, Martin Horauer, Nikolaus Kerö · 1999
This paper shows how to distribute GPS-time with micro-accuracy and below even in Ethernet-based distributed systems. Our SynUTC-approach is based upon a simple network controller-level hardware for timestamping data packets as they leave and arrive at a node, which comes in two flavors: The memory-based times-tamping method exploited by our Network Time Interface (NTI) M-Module timestamps data packets as the network controller accesses them in memory. This technique can be used for virtually any type of network and network controllers. For 10 Mb/s Ethernet, for example, our experimental evaluation revealed a time distribution accuracy down to the pus-range.