From the Internet dictionary

  Diodorus Siculus 18:54 12 Nov 2003

ASDL is the Broadband one... ISDN splits your regular line in two


ASDL (Asymmetric Digital Subscriber Line) Internet connections using DSL protocol with bandwidths from 16 to 640 Kbps upstream and 1.5 to 9 Mbps downstream.

ISDN (Integrated Services Digital Network) Special connections that use ordinary phone lines to transmit digital instead of analog signals. Briefly, ISDN is a telecommunications network that allows for digital voice, video, and data transmissions. ISDN replaces the slow and inefficient analog telephone system with a fast and efficient digital communications network. ISDN lines contain two channels: a B channel, which has a 64Kbps (kilobits per second) data transmission rate, and a D channel, which has either a 16Kbps or 64Kbps transmission rate. When the two lines are used together, transmitted data can travel at 128Kbps

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