Data and Computer Communications. Chapter 10 Packet Switching. Basic Operation. Data transmitted in small packets Longer messages split into series of packets Each packet contains a portion of user data plus some control info Control info Routing (addressing) info
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Small packet size decreases total transmission time; but, there is a limit to this approach because of the header. Here, d is larger than c. So, transmission time starts to increase again as a function of header to data ratio.
For each source-destination pair, the routing table shows the next node on the route.
· See figure 10.16 and explanations on pages 331-333
· Left side shows the packets exchanged between user machine A and the packet switching node to which it is attached
Used when address overflow from top or bottom happens