G.811 ''Timing characteristics of primary reference clocks'' is a recommendation from the
ITU Telecommunication Standardization Sector (ITU-T). It specifies requirements for primary reference clock devices in
synchronization networks. It discusses timing requirements for connecting national telecommunications networks.
Primary reference clocks need to be highly accurate and are often based on
caesium atomic clocks that meet the standards of G.811.
References
External links
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ITU-T recommendations
ITU-T G Series Recommendations