A. What are the delays (from sender to receiver, ignoring any playout delays) of

Question

A. What are the delays (from sender to receiver, ignoring any playout delays) of packets 2 through

8? Note that each vertical and horizontal line segment in the figure has a length of 1, 2, or 3 time

units.

B. If audio playout begins as soon as the first packet arrives at the receiver at t = 8, which of the

first eight packets sent will not arrive in time for playout?

C. If audio playout begins at t = 9, which of the first eight packets sent will not arrive in time

for playout?

D. What is the minimum playout delay at the receiver that results in all of the first eight packets

arriving in time for their playout?

Explanation / Answer

A.

The delay (from sender to receiver) of packet 2 is 8 slots.
The delay (from sender to receiver) of packet 3 is 8 slots.
The delay (from sender to receiver) of packet 4 is 8 slots.
The delay (from sender to receiver) of packet 5 is 10 slots.
The delay (from sender to receiver) of packet 6 is 9 slots.
The delay (from sender to receiver) of packet 7 is 8 slots.
The delay (from sender to receiver) of packet 8 is 8 slots.

B. Packets   2, 3, 4, 5, 6, 7, and 8 will not be received in time for their playout if playout begins at t-8.

C. Packets 3, 5 and 6 will not be received in time for their playout if playout begins at t=9.

D. No packets will arrive after their playout time, if playout time begins at t=10

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