Circuit switching

e2e resources reserved for “call” between source & dest.

in diagram, each link as 4 circuits.

call gets 2nd circuit in top link, 1st circuit in right link.

dedicated resources: no sharing

  • circuit-like perf

    • no queueing delays
    • no packet drops
  • If resource is reserved, you cannot use it :(

  • however circuit segment idle if not used by call

commonly used in traditional telephone networks