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An integrated  susbcriber digital network (ISDN) is a digital telephone service that provides fast, accurate data transmission over existing copper telephone wiring. ISDN circuits are available in two types, basic rate 2 x voice channels at 56/64K plus one signalling channel 16K, and T1/E1 23/30 voice channels with one 64K signalling channel. Commonly used to connect PABX telephone systems to the public telephone network.