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Digital Access Signalling System 1

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This is an old revision of this page, as edited by PartTimeGnome (talk | contribs) at 22:13, 16 April 2012 (Expand slightly with content merged from Digital Access Signalling System; add cat and navbox for BT Group). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Digital Access Signaling 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 It is now obsolete, having been replaced by DASS2.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.

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