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Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

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Integrated Services Digital Network

As originally conceived, Integrated Services Digital Network (ISDN) was the replacement technology for the analog network. It provides a total bandwidth of 144 Kbps, parceled into three channels—two 64-Kbps “bearer” channels (or B-channels) for transmitting digital information (voice, data, or video) and one 16-Kbps “signaling” channel (or D-channel) for transmitting call setup information and packet-switched data. ISDN is a dialup technology that uses your existing twisted-pair copper telephone lines to transmit and receive data while allowing for simultaneous use of your telephone for voice calls. The two B-channels are independent from one another and can be used to transmit voice or data to two independent ...

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