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'''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 It is now obsolete, having been replaced by [[DASS2]].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
==References==
{{Reflist}}
{{BT Group}}
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