Digital Access Signalling System 1

This is an old revision of this page, as edited by Steven (Editor) (talk | contribs) at 18:21, 15 November 2017 (Steven (Editor) moved page DASS1 to Digital Access Signalling System 1 over redirect: The full name rather than the abbreviated format would be better.). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Digital Access Signalling System 1 (DASS1) is a proprietary protocol defined by British Telecom to provide ISDN services in the United Kingdom. It is now obsolete, having been replaced by DASS2. This too will become obsolete over the coming years as Q.931, a European standard, becomes widely adopted in the EU.