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An Imbedded System for Time Synchronization in Distributed Environment based on the Internet  

Hwang So-Young (부산대학교 전자계산학과)
Yu Dong-Hui (부산카톨릭대학교 컴퓨터정보공학부)
Li Ki-Joune (부산대학교 정보컴퓨터공학부)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.11, no.3, 2005 , pp. 216-223 More about this Journal
Abstract
A computer clock has limits in accuracy and precision affected by its inherent instability, the environment elements, the modification of users, and errors of the system. So the computer clock needs to be synchronized with a standard clock if the computer system requires the precise time processing. The purpose of synchronizing clocks is to provide a global time base throughout a distributed system. Once this time base exists, transactions among members of distributed system can be controlled based on time. This paper discusses the integrated approach to clock synchronization. An embedded system is considered for time synchronization based on the GPS(Global Positioning System) referenced time distribution model. The system uses GPS as standard reference time source and offers UTC(Universal Time Coordinated) through NTP(Network Time Protocol). A clock model is designed and adapted to keep stable time and to provide accurate standard time with precise resolution. Private MIB(Management Information Base) is defined for network management. Implementation results and performance analysis are also presented.
Keywords
time synchronization; embedded system; clock model; GPS; NTP; SNMP;
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