Determine the maximum length of the cable (in km) for transmitting data at a…
2021
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 10000 bits. Assume the signal speed in the cable to be 200000 km/s.
- A.
1
- B.
2
- C.
2.5
- D.
5
- E.
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Correct answer: B
For Ethernet CSMA/CD, transmission time must exceed twice the propagation delay. Using distance equals frame size times speed divided by two times bandwidth, we calculate 10000 bits times 200000 km/s divided by two times 500 Mbps. This results in a maximum cable length of exactly 2 kilometers.