1、QUESTION ITU-R 239/7*Instrumentation time codes (2001) The ITU Radiocommunication Assembly, considering a) that Recommendation ITU-R TF.1011, Systems, techniques and services for time and frequency transfer, includes various dissemination/comparison methods involving the use of instrumentation time
2、codes and signals for local and long-distance time transfer; b) that Recommendation ITU-R TF.583, Time codes, addresses other forms of time codes used between pieces of equipment via hardwired or other types of connections; c) that time codes and metrological signals used for the dissemination or co
3、mparison of time and frequency signals via hardwired or other means are not sufficiently standardized for reference or use; d) that the increasing capability of modern time transfer systems by satellite or other means will require commonality in measurement accuracy and precision, decides that the f
4、ollowing Question should be studied 1 What are the various instrumentation time codes and signals in use within timing centres and systems? 2 Are there common or standardized time codes and signals sufficient for instrumentation needs? 3 What options should be considered regarding the future needs i
5、n establishing common standardized time codes and signals for instrumentation and interfaces into modern telecommunication systems? further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the above studies should be completed by 2011. _ *In the year 2009, Radiocommunication Study Group 7 extended the completion date of studies for this Question.
