Discussion
In a time division switch, if each memory access takes 100 ns and one frame period is 125 µs, then the maximum number of lines that can be supported is
Answer: A
Correct answer: 625
Each line needs one write and one read per frame, so two memory accesses of 100 ns, and the whole frame period is available:
\[ \frac{125\ \mu\text{s}}{2\times 100\ \text{ns}} = \frac{125\times 10^{-6}}{2\times 10^{-7}} = 625 \]
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