ISDN is a viable solution for individuals and small networks when other high speed connection options are not available. It is capable of transmitting voice and data over the same pair of copper wires in an all-digital format. ISDN is readily available as it works over standard telephone lines. Though much faster than analog, it does still require a dial-in process. However, ISDN supports both on demand dial out and dial in such as might be used by telecommuters or after hours workers. The downside of ISDN is that it is a usage based service and potentially very expensive. You cannot host servers on an ISDN connection and it is not as fast as DSL or T1 connections.

ISDN Speed: provides speeds up to 128 Kbps.

Burstable and Frame Relay solutions are ideal for businesses who have mission critical applications that require fast, always on, reliable and proven technologies. These connections are suited for any business conducting e-commerce and need a substantial investment in hardware and service. T1 service can be twice as expensive as DSL. However, DSL is a "best effort service" and reliant on the telecom infrastructure. Fractional T1 or Burstable T1 service provides bandwidth of up to 1.5 Megabits per second on a 24 hours-a-day, 7 days-per-week basis. Basically when you pay for a fractional T1 line you are leasing only the amount of the T1 lines' 24 channels to meet your needs. Fractional T1 circuits are upgradeable and bandwidth can be increased by adding 56Kbps or 64Kbps fractions which increases performance (i.e. from 128Kbps to 256Kbps).