ITU is the leading United Nations agency for information and communication technologies. As the global focal point for governments and the private sector, ITU's role in helping the world communicate spans 3 core sectors: radiocommunication, standardization and development. Chronos is an associate member of ITU-T Study Group 15, Question 13 - Network Synchronisation and Time Distribution Performance. Network sync performance specifications are essential for successful operation of digital transmission networks including the support of, for example, mobile networks. Network timing performance standards are necessary to define the feasibility and most effective means of implementing a time reference distribution service. This includes the distribution of both precision time and frequency.

The following major Recommendations, in force at the time of approval of this Question, fall under its responsibility:

  • Definitions and Architecture: G.781, G.810, G.8260, G.8264, G.8265, G.8275
  • PTP Profiles: G.8265.1, G.8275.1
  • Network Performance: G.8251, G.822, G.823, G.824, G.825, G.8261, G.8261.1, G.8271, G.8271.1
  • Clocks: G.811, G.812, G.813, G.8262, G.8263, G.8272, G.8273, G.8273.2
  • Test equipment: O.171, O.172, O.173, O.174 and O.182

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