Short for Integrated Services Digital Network.
This is a digital service provided by British Telecom to allow you to connect to the Internet and transmit digital data over ordinary telephone copper wire as well as other media.
It is now largely obsolete because it has been superceded by Broadband (ADSL). Although some areas of the country may be still using it because they do not have broadband.
ISDN was a service developed in the time when analogue modems were running at speeds from 32kbs to 56kbps. ISDN on the other hand offered speeds of 64kbps on a single channel or 128kbps on a double channel and there was no need to 'dial in' which could take ages on an analogue modem.
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Click on this link: ISDN