ISDN – Integrated Services Digital Network

ISDN – or Integrated Services Digital Network – offers digital data transmission (including voice and video) over the existing copper wire network. It is not a broadband service and instead of a modem you use an ISDN adapter, called a terminal adapter.

Two types of ISDN are available – the Basic Rate Interface (BRI) for homes and small businesses, and the Primary Rate Interface (PRI) for large businesses and organisations.

ISDN lines offer speeds of 128 kb which, while good in comparison to dia- up, are seen as slow now that DSL broadband is so widely available. Therefore, nowadays ISDN is not a particularly useful option for domestic users.

By Sarah at UK Broadband Finder
Read my Broadband Glossary disclaimer

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