POTS based Circuit Switched Services
Use regular dial-up phone lines and a modem
- Modem used to call another modem
- Once a connection is made, data transfer begins
Commonly used to connect to the Internet by calling an ISP’s access point
Wide Area Telephone Services (WATS)
- Wholesale long distance services used for both voice and data
- Users buy so many hours of call time per month (e.g., 100 hours per month) for one fixed rate