TIMING IN SWISSNET SPECIFICATION, DEVELOPMENT, IMPLEMENTATION AND OPERATIONAL EXPERIENCE

Peter Kartaschoff

Abstract:	This is a report on a team effort started in 1974. During the past 15 years two generations of frequency control and timing equipment have been developed. The installation of the second generation equipment started in 1985. The principles of the clock hierarchy is recalled and compared to more recent proposals. The Swiss Integrated Services Digital Network (SWISSNET) derives its timing from its own three geographically separated primary reference clocks. It is designed to comply with the relevant CCITT Recommendations at the second highest level of hierarchy, consisting of about sixty timing nodes. These in turn control the clock units of all digital switches. The switching equipment is supplied by three different vendors which all have been able to satisfy the specifications imposed on their timing equipment. Some examples of problems and how they were solved will be reported and offered for discussion.
Published in:	Proceedings of the 21th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 1989 Sheraton Hotel Redondo Beach, California
Pages:	19 - 38
Cite this article:	Kartaschoff, Peter, "TIMING IN SWISSNET SPECIFICATION, DEVELOPMENT, IMPLEMENTATION AND OPERATIONAL EXPERIENCE," Proceedings of the 21th Annual Precise Time and Time Interval Systems and Applications Meeting, Redondo Beach, California, November 1989, pp. 19-38. https://doi.org/10.33012/1989.14501
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