Holdover: based on G.812 Type III clock (Stratum 3E)
Testing methods: Appendix I describes three methods of measuring the performance of slave clock:
PDV patterns based on flicker noise Measures clock performance using input PDV containing equal energy in every decade of frequency (i.e. flicker noise)
PDV patterns based on combined sinusoidal waveforms Measures clock performance using input PDV containing multiple frequencies simultaneously
PDV patterns based on a single sinusoidal waveforms Measures clock performance using PDV containing a sinusoidal modulation of the floor delay