It is known that the maximum and minimum amount of {HEAD ~ time} a clock signals rising and falling edges require to travel from a root of the subtree to any sink receiving the clock signal via the subtree are not only functions of the characteristics of {TAIL ~ the conductors} and active devices forming the subtree, but are also functions of the clock signals rising and falling edge transition times at the subtree root 
It is known that the maximum and minimum amount of { HEAD ~ time } a clock signals rising and falling edges require to travel from a root of the subtree to any sink receiving the clock signal via the subtree are not only functions of the characteristics of { TAIL ~ the conductors } and active devices forming the subtree , but are also functions of the clock signals rising and falling edge transition times at the subtree root
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