Discussion
A frame carries \( 32 \) slots of \( 8 \) bits at \( 8000 \) frames per second. The slot duration is
Answer: A
The frame lasts one sampling interval, shared among the slots:
\[ \begin{aligned} T_{f} &= \tfrac{1}{8000} = 125 \ \mathrm{\mu s} \\ T_{s} &= \tfrac{125}{32} = 3.9 \ \mathrm{\mu s} \end{aligned} \]
giving 3.9 microseconds. 125 microseconds is the whole frame, 31.25 would follow from eight slots, and 0.49 is the duration of a single bit. Keeping frame, slot and bit intervals distinct is essential, since all three are quoted in microseconds and differ only by the factors that define them.
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