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

The Telecommunication Laboratories TL has provided timing for Taiwan since 1969. Its Master Clock MC is the source of UTC TL, TLs 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 two hydrogen maser frequency standards in four electro-magnetic wave shielding rooms and TLs time scaling algorithm. TL disseminates time via speaking clock, Taiwans 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 deg C and 50 plus or minus 5, respectively. This paper also describes some of the changes being made recently for international and domestic time transfer in future development.