ISDN
Integrated Services Digital Network (ISDN) is a special digital-only telephone service that can carry two independent voice or data conversations over one telephone wire. ISDN service is actually a different type of telephony; you can’t plug an ordinary telephone into an ISDN line. ISDN modems can carry data at 64Kbps or 128Kbps, depending on whether you use one or two of its channels to connect to your ISP. Although ISDN Internet service is still available in some areas, we don’t recommend it as an Internet connection option. Dial-up is nearly as fast as ISDN. If you need greater speed, and you can’t get DSL or cable service, satellite and wireless service are better options.
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