in full Integrated Services Digital Network
Digital telecommunications network that operates over standard copper telephone wires or other media.
ISDN connections are used to provide a variety of digital services to customers, including digital voice telephone, fax , e-mail , digital video, and access to the Internet . A wide range of data transfer rates are available, with speeds up to about 128 kilobits per second (kbps). ISDN is faster than an ordinary dial-up connection (at about 56 kbps), but much slower than cable modem or DSL connections (which typically exceed one megabit per second).