EFFECT OF VARIOUS FEATURES ON THE LIFE CYCLE COST OF THE TIMING/SYNCHRONIZATION SUBSYSTEM OF THE DCS DIGITAL COMMUNICATIONS NETWORK

D.B. Kimsey

Abstract:	This paper reports the results of one task of a study, the purpose of which includes evaluating the advantages and disadvantages of implementing a set of optional timing/synchronization features in the future DCS digital communications network. The task reported on in this paper examines the effect on the life cycle cost of the timing subsystem when these optional features are included in various combinations. The features include mutual control, directed control, double-ended reference links, independence of clock error measurement and correction, phase reference combining, self-organization, smoothing for link and nodal dropouts, unequal reference weightings, and a master in a mutual control network. An overall design of a microprocessor-based timing subsystem was formulated. The microprocessor (8080) implements the digital filter portion of a digital phase locked loop, as well as other control functions such as organization of the network through communication with processors of neighboring nodes. Other components of the subsystem include: extended-range linear phase detector. Overhead interface, frequency standard, frequency or phase correcting apparatus. elastic buffers, and frequency synthesizers. A packaging scheme based on double-sided printed circuit cards was chosen. The particular packaging scheme was familiar to the author and is not claimed to be optimal for the application.
Published in:	Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 1978 Goddard Space Flight Center Greenbelt, Maryland
Pages:	463 - 489
Cite this article:	Kimsey, D.B., "EFFECT OF VARIOUS FEATURES ON THE LIFE CYCLE COST OF THE TIMING/SYNCHRONIZATION SUBSYSTEM OF THE DCS DIGITAL COMMUNICATIONS NETWORK," Proceedings of the 10th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1978, pp. 463-489.
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