This Recommendation outlines minimum requirements for timing devices used as node clocks in
synchronization networks. The requirements relate to fi-equency deviation; pull-in, hold-in and pullout range; noise generation, tolerance and transfer; transient
ITU-T G.812-2004 history
2004ITU-T G.812-2004 Timing requirements of slave clocks suitable for use as node clocks in synchronization networks Study Group 15