1. Manual

  2. Step-by-step

  3. Crossbar with stored program control

  4. Digital Switching(figure) -> (postscript version)
    • Digital switching based on time-space-time (TST) switching structure (postscript)

  5. Packet Switching
    • Existing switching methods allow interconnection of users at discrete information transfer rate e.g., 64 Kbps, or 1.544 Mbps.
    • Customers "will demand" dynamic allocation of transfer rates, e.g., to exactly match their specific needs.
    • Packet switching will provide dynamic allocation of transfer rates. (The proposed form of packet switching for the public network is called Asynchronous Transfer Mode (ATM)).

  6. Optical Switching
    • All current telecommunication switches are electronic, therefore they require photon-to-electron conversions (provided in optical to electronic (E/O)) interfaces.
    • Optical switching will illiminate these interfaces and therefore allow for cheaper and faster switching.