Isochronous timing is a characteristic of a repeating event whereas synchronous timing refers to the relationship between two or more events.
2.
Asynchronous time-division multiplexing ( ATDM ), is an alternative nomenclature in which STDM designates synchronous time-division multiplexing, the older method that uses fixed time slots.
3.
Low-power synchronous timing motors ( such as those for traditional electric clocks ) may have multi-pole PM external cup rotors, and use shading coils to provide starting torque . " Telechron " clock motors have shaded poles for starting torque, and a two-spoke ring rotor that performs like a discrete two-pole rotor.
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