Suppose a 100 km long cable has a speed of 1.536 Mbps. The signal speed in…
2018
Suppose a 100 km long cable has a speed of 1.536 Mbps. The signal speed in cable is 2/3 speed of the light. What will be the number of bits in the cable?
Answer: B. 768 — Calculate signal speed as two-thirds of light speed, yielding 200 million meters per second. Determine propagation delay by dividing the 100-kilometer cable…
- A.
500
- B.
768
- C.
307
- D.
400
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Correct answer: B
Calculate signal speed as two-thirds of light speed, yielding 200 million meters per second. Determine propagation delay by dividing the 100-kilometer cable length by this speed, resulting in half a millisecond. Multiply the 1.536 Mbps bandwidth by this delay to find exactly 768 bits in the cable.
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