The Timing Activities of the National Time and Frequency Standard Laboratory of the Telecommunication Laboratories, CHT Co. Ltd., Taiwan

P. C. Chang, J. L. Wang, H. T. Lin, S. Y. Lin, W. H. Tseng, C. C. Lin, F. D. Chu, and C. S. Liao

Abstract:	The Telecommunication Laboratories (TL) has provided timing for Taiwan since 1969. Its Master Clock (MC) is the source of UTC (TL), TL’s realization of Coordinated Universal Time (UTC), which has stayed within 30 ns of UTC during these years and within 15 ns in the past 12 months. The data used to generate UTC (TL) and TA (TL) are based upon 14 cesium and twohydrogen maser frequency standards in four electro-magnetic wave shielding rooms and TL’s time scaling algorithm. TL disseminates time via speaking clock, Taiwan’s computer time service (TCTS), telecom lease line, Network Time Protocol (NTP), GPS, and Two-Way Satellite Time and Frequency Transfer (TWSTFT). To meet future needs of precision, accuracy, and robustness for UTC (TL), TL rebuilt the air conditioner system of the clock rooms and their monitor system. The new system could maintain temperature and humidity of clock rooms within 23 ± 0.3°C and 50 ± 5%, respectively.This paper also describes some of the changes being made recently for international and domestic time transfer in future development.
Published in:	Proceedings of the 41st Annual Precise Time and Time Interval Systems and Applications Meeting November 16 - 19, 2009 Hyatt Regency Tamaya Resort Santa Ana Pueblo, New Mexico
Pages:	215 - 220
Cite this article:	Chang, P. C., Wang, J. L., Lin, H. T., Lin, S. Y., Tseng, W. H., Lin, C. C., Chu, F. D., Liao, C. S., "The Timing Activities of the National Time and Frequency Standard Laboratory of the Telecommunication Laboratories, CHT Co. Ltd., Taiwan," Proceedings of the 41st Annual Precise Time and Time Interval Systems and Applications Meeting, Santa Ana Pueblo, New Mexico, November 2009, pp. 215-220.
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