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Time taken to send packet from source to destination

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Consider sending a file of F bytes over a path of Q links. Each link transmits at R bps. The network is lightly loaded so that there are no queuing delays. Propagation delay on each link is Tp on average.

a. Suppose the network is a packet-switched virtual-circuit (VC) network. Denote the VC setup time by Ts seconds. Suppose the sending layers add a total of h bits of header to each packet. How long does it take to send the file from source to destination?

b. Suppose the network is a packet-switched datagram network, and a connectionless service is used. Now suppose each packet has 2h bits of header. How long does it take to send the packet?

c. Finally, suppose that the network is a circuit-switched network. Further suppose that the transmission rate of the circuit between source and destination is R bps. Assuming Ts setup time and h bits of header appended to the packet, how long does it take to send the packet?

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Solution Preview

Since nothing is given about the packet size, this solution assumes that packet size is big enough to accommodate (F+2h/8) bytes.

(a) In case of packet-switched virtual-circuit network, first the virtual connection is set up in Ts seconds, and then the packet is transmitted through Q links.

Packet size = F bytes + h bits header = (8F+h) bits

Time to transmit the packet onto a link = Time taken to transmit the packet + ...

Solution Summary

Since nothing is given about the packet size, this solution assumes that packet size is big enough to accommodate (F+2h/8) bytes.

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