Question

Consider a network link that has distance of 100 meters, and signal traverses at the speed of light in cable 2.5 x 10^8 meters per second. The link has transmission bandwidth of 100 megabits/second (100 x 10^6 bits per second). The packet size is 400 bits. What is the signal propagation delay?

Answer 1

signal propagation delay = 0.4 μsec

Explanation:

The link has transmission bandwidth of 100 megabits/second (100 x 10^6 bits per second).

The packet size is 400 bits.

The packet size is much lesser than the transmission bandwidth. Hence there won't be any wait period.

To know the signal propagation delay, we can calculate the delay time:

Delay Time = Distance / Speed =  100 / (2.5 * 10⁸)  = 40 * 10⁻⁸  seconds.

= 40 * 10⁻² * 10⁻⁶ sec

= 0.4 μsec