- Digital Access Signalling System
The Digital Access Signalling System (DASS) is the United Kingdom proprietary standard created by British Telecom to provide ISDN services in the United Kingdom. The first incarnation DASS1 is now obsolete and has been replaced by DASS II. This itself will become obsolete over the coming years as Q.931, a European standard becomes widely adopted in
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Other Annual Group Revenue: £20.9 billion GBP (2009-10) · Employees: 101,700 (2010) · Stock Symbol: LSE: BT.A · Website: www.btplc.com
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