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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.

1. 1
2. 2
3. 2.5
4. 5

Correct answer: 2

Solution

The maximum length of the cable is determined by the propagation delay and the transmission time of the frames. Given the data rate and frame size, the transmission time is 0.02 seconds, and with a signal speed of 200,000 km/s, the maximum distance that can be covered without collisions is 2 km.

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