Multiple choice

A 100 km long cable runs at T1 data speed. The propagation speed in the cable is 2/3rd of the speed of light. How many bits will fit in the cable?

  1. 800

  2. 672

  3. 772

  4. 1544000

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

L = 100 km = 100000 m Data rate of T1 = 1.544 Mbps Speed (v) = 2/3 x 3 x 100 000 000 m/s Number of bits in 1 sec = 1.544 x 1000,000 bits Distance covered in 1 sec = 2 x 100,000,000 m Number of bits corresponding to 100000 m cable is given by: = ((1.544 x 1000000) x 100000)/2 x 100 000 000 => 772 bits 

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