Digital Access Signalling System 1: Difference between revisions

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{{short description|Proprietary protocol providing ISDN services}}

'''Digital Access Signaling System 1''' ('''DASS1''') is a [[protocol (computing)|protocol]] defined by British Telecom for digital links to [[PSTN]] based on [[Integrated Services Digital Network|ISDN]].

{{Use dmy dates|date=April 2022}}

{{Ref improve|date=February 2024}}

'''Digital Access Signalling System 1''' ('''DASS1''') is a [[proprietary protocol]] defined by [[British Telecom]] to provide [[Integrated Services Digital Network|ISDN]] services in the [[United Kingdom]].<ref>{{cite web |title=Introduction To Line Telecommunications |url=https://www.tlc-direct.co.uk/Technical/Telecoms/History/TH022.htm |publisher=TLC |access-date=3 February 2024}}</ref> It is now obsolete, having been replaced by [[DASS2]].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 [[European Union|EU]].

See also [[DASS2]].

==References==

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{{BT Group}}

[[Category:BT Group]]

[[Category:History of telecommunications in the United Kingdom]]

[[Category:Integrated Services Digital Network]]

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