Multiple choice

If the transmission speed is 20 Mbps and the propagation speed in coax is 2/3 the speed of light in vacuum, then what will be the length of a bit on the original 802.3 standard?

  1. 20 meters

  2. 30 meters

  3. 50 meters

  4. It will not transmit the bit

  5. None of the above
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A Correct answer
Explanation

It takes 0.1 µsec to transmit a bit at 10 Mbps rate. Thus, the bit lasts 0.1 µsec in time , during which it propagates 20 meters. Thus, a bit is 20 meters long here  as the speed of light in coax about is 200,000 km/sec (200 meters/µsec).

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