ITU-R TF.685-1990 (WITHDRAWN) International Synchronization of UTC Time Scales - Section 7B - Specifications for the Standard-Frequency and Time-Signal Services
that each timing centre, within the constraints of their operational requirements, pursue improved methods, digital servo techniques, and algorithms for synchronizing their UTC(k) to UTC, one microsecond being a desirable goal
ITU-R TF.685-1990 history
1990ITU-R TF.685-1990 (WITHDRAWN) International Synchronization of UTC Time Scales - Section 7B - Specifications for the Standard-Frequency and Time-Signal Services