Circuit-Switched vs. Packet-Switched Services
Circuit Switched Networks (ISDN, Switched 56)
- Any-to-any connectivity by dialing number
- Highest speed is ISDN: 64 kbps to 128 kbps
Packet Switched Networks (X.25, Frame Relay, ATM)
- PVCs make them primarily competitors to leased lines
- Megabit to gigabit speeds
- SVCs may provide any-to-any flexibility in the future