This illustration includes a router as the center of the image, with a desktop computer on either side. The desktop computer on the left is labeled "Source" and the desktop computer on the right is labeled "Destination." The source computer contains three blue packets, labeled 3, 2 and 1. From these packets is a blue arrow pointing towards the router, where they are being sent at R bps. In the router is one packet that is only partly blue, suggesting that it is in the process of being transferred to the router. This packet is labeled: "Front of packet 1 stored in router, awaiting remaining bits before forwarding."