I

Integrated Services Digital Network (ISDN)

A completely digital telephone/telecommunications network for carrying voice, data, images, and video at high speed by sending digitally encoded signals at speeds of up to 144,000 bps on Basic Rate Interface (BRI-ISDN) lines and much higher on Primary Rate Interface (PRI-ISDN) lines. ISDN is composed of at least three channels and as many as 32 channels, for simultaneous, independently operated transmission of voice and data. See also Basic Rate Interface (BRI-ISDN), Primary Rate Interface (PRI-ISDN).

inverse multiplexing

The process whereby bandwidth enables a call to transmit more information at the same time in the same timeframe than information from a single signal transmitted over a single channel. This is accomplished by splitting a single high-speed channel into multiple signals, transmitting the multiple signals over multiple facilities operating at a lower rate than the original signal, and then recombining the separately transmitted portions into the original signal at the original rate. See also bandwidth.

ISDN

See Integrated Services Digital Network (ISDN).