GATE | GATE CS 2013 | Question 65

Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s.
(A) 1
(B) 2
(C) 2.5
(D) 5

Answer: (B)


Data should be transmitted at the rate of 500 Mbps.
Transmission Time >= 2*Propagation Time
=> 10000/(500*1000000) <= 2*length/200000
=> lenght = 2km (max)
so, answer will be: (B) 2km 

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