Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Digital Access Signaling System 2 (DASS2) is an obsolescent protocol defined by British Telecom for digital links to PSTN based on ISDN. Although still available on request, it has been superseded by ETS 300 ("EuroISDN"). DASS2 is an improved version over DASS1, based on experiences with DPNSS. In the UK, the ISDN concept was first introduced to customers by BT with their DASS2 connections. DASS2 (Digital Access Signalling System) is a BT designed signalling standard. It was introduced before the Q.931 standard was finalised by the International Community. British Telecom used the term ISDN when describing their DASS2 lines.

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