Levine J, Weiss M, Davis D D, Allan D W, Sullivan D B
National Institute of Standards and Technology, Boulder, CO 80303.
J Res Natl Inst Stand Technol. 1989 Sep-Oct;94(5):311-321. doi: 10.6028/jres.094.029.
The NIST Automated Computer Time Service (ACTS) is a telephone time service designed to provide computers with telephone access to time generated by the National Institute of Standards and Technology at accuracies approaching 1 ms. Features of the service include automated estimation by the transmitter of the telephone-line delay, advanced alert for changes to and from daylight saving time, and advanced notice of insertion of leap seconds. The ASCII-character time code operates with most standard modems and computer systems. The system can be used to set computer clocks and simple hardware can also be developed to set non-computer clock systems.
美国国家标准与技术研究院自动计算机时间服务（ACTS）是一种电话授时服务，旨在为计算机提供通过电话获取由美国国家标准与技术研究院生成的时间的途径，精度可达近1毫秒。该服务的特点包括发射机自动估计电话线延迟、对夏令时变更的提前警报以及闰秒插入的提前通知。ASCII字符时间码可与大多数标准调制解调器和计算机系统配合使用。该系统可用于设置计算机时钟，还可开发简单硬件来设置非计算机时钟系统。
