A packet switch receives a packet and determines the outbound link to which the

Question

A packet switch receives a packet and determines the outbound link to which the packet should be forwarded. When the packet arrives, one other packet is halfway (50%) done being transmitted on th is outbound link and three other packets are waiting to be transmitted. Packets are transmitted in order of arrival. Suppose all packets are 8 00 bytes and the link rate is 2 Mbps. What is the queuing delay for the packet? More generally, what is the queuin g delay when all packets have length L, the transmission rate is R, x bits of the currently - being - transmitted packet have been transmitted, and n packets are already in the queue?

Explanation / Answer

The arriving packet must first wait for the link to transmit 3.5*(800*8/(2*106))s=11.2ms

Generally, the queuing delay is [nL + (L - x)]/R

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