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Author(s) Bonaventure Olivier
Deadline Καμία προθεσμία
Submission limit No limitation

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Packet flow through a FIFO queue

Networks are composed of links that operate at different bandwidth. When a router needs to forward the packets received from a high-speed link to a lower speed one. In this case, the packets are queued in the buffer before being transmitted on the low speed link.

Let us consider two routers :
  • an upstream router
  • a downstream router

The link between the upstream and the downstream router operates at 10 Mbps. The downstream router forwards the packets received from the upstream router over a 1 Mbps link.

Buffer occupancy on the downstream router
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If the upstream router starts to send packets at 10 Mbps, how many seconds will last before the queue containing q bits becomes full ?

Provider your answer as an equation t=f(q) where t is the delay until the queue becomes full and q the capacity of the buffer