Host A and B are separated by single communication link of length m meters. Prop

Question

Host A and B are separated by single communication link of length m meters. Propagation speed of the link is s m/s and the data rate of the link is R bps. Consider the case where A sends a packet of length L bits to B. What is the propagation delay, d_prop, of the link? What is the transmission time, d_trans, of the packet? Ignoring the processing and queuing delays what is the end-to-end delay of the packet? If A starts transmitting at time t = 0. Where is the last bit of packet at t = d_trans? If d_prop > d_trans where is the first bit of the packet at t = d_trans ? If d_prop

Explanation / Answer

a) Propogation delay = time taken for the signal to reach the destination
link speed = s m/s
link length = m metres
Propogation delay = m/s
b) Transmission time = bits/bit rate = L / R
c) end to end delay = d-prop + d-trans = L/R + m/s
d) at t = dtrans, the last bit of the packet has just left the point A ( d-trans is the time when the last bit leaves the system from point A)
e) If d-prop > d-trans ,then at t = d-trans, the bit would still be at point A
f) If d-prop < d-trans, then at t = d-trans the bit would have reached the user B
g) s = 2*10^8
L = 200
R = 56 kbps
m = ?
dprop = dtrans
L/R = m/s
m = 7.142*10^8 m

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