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- Three types of clocks: Type I (Europe), Types II and III (N. America)
- Performance characteristics based on the equivalent G.812 Types I, II or III:
- Frequency accuracy (free-run)
- Wander generation (but measured through a low-pass filter of 0.1Hz)
- Wander tolerance
- Wander transfer
- Transient response and holdover
- Functional model: