Timing in SWISSNET Specification, Development, Implementation and Operational Experience
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA519918
Entities
People
- Peter Kartaschoff