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- DASS2 abstract "Digital Access Signalling System 2 (DASS2) is an obsolescent protocol defined by British Telecom for digital links to PSTN based on ISDN. Although still available on request, it has been superseded by ETS 300 102 ("EuroISDN").DASS2 is an improved version over DASS1, based on experiences with DPNSS. In the UK, the ISDN concept was first introduced to customers by BT with theirDASS2 connections. DASS2 (Digital Access Signalling System) is a BT designedsignalling standard. It was introduced before the Q.931 standard was finalisedby the International Community. British Telecom used the term ISDN whendescribing their DASS2 lines.DASS2 lines are provided to the customer on a 2Mbit/s link and can handle 30simultaneous calls (64kbit/s each). DASS2 is still offered by BT and other UKcarriers. Q.931 is the name of the CCITT document that describes the agreedsignalling format for International ISDN. The CCITT used to be InternationalTelegraph and Telephone Consultative Committee. This is the organisation that set out the internationally agreed standards for telecommunications. This organisation hassubsequently evolved into the ITU. In the United Kingdom the Q.931 basedprotocol is ETS 300 102 (also known as EuroISDN). This is a very closeimplementation of the original CCITT specification. This is a 2Mbit/s service aswith DASS2 but the feature capability is far greater and has negated theproblems associated with DASS2 including echo problems and circuit spikes. Inthe UK both DASS 2 and EuroISDN (ETS 300 102) lines are available to customers with EuroISDN as the preferred signalling type. Customers will normally choosethe desired signalling system, as this will be dictated by their CPE (Customer Premises Equipment),usually a PABX.Most modern PABXs can handle many different types of signalling system, howeverthe trend seems to be away from the DASS2 which is no longer being developed byBT and have been known to deny problems with their DASS2 circuits, and movetowards the internationally recognised Q.931 standard. The Q.931 standard is aninternational standard utilised by many countries telephony service providers.The CCITT specify the standards for the layer 1, layer 2 and layer 3 signallingmessages. The layer 3 messages are the messages that actually control the callsetup, teardown, and routing.The layer 3 messages or Call Control messages are the minimum messages that mustbe understood by the interfacing equipment. Individual service providers maypublish their own documentation that details further messages that will betransported in addition to Q.931 messages. There are a number of additionalEuropean documents that cover supplementary services. These cover features thatmay be instigated by exchanges via the ISDN and require a higher degree of layer 3 implementation.".
- DASS2 wikiPageID "8967".
- DASS2 wikiPageLength "3266".
- DASS2 wikiPageOutDegree "15".
- DASS2 wikiPageRevisionID "492982632".
- DASS2 wikiPageWikiLink BT_Group.
- DASS2 wikiPageWikiLink British_Telecom.
- DASS2 wikiPageWikiLink CCITT.
- DASS2 wikiPageWikiLink Category:BT_Group.
- DASS2 wikiPageWikiLink Category:Integrated_Services_Digital_Network.
- DASS2 wikiPageWikiLink Communications_protocol.
- DASS2 wikiPageWikiLink DASS1.
- DASS2 wikiPageWikiLink DPNSS.
- DASS2 wikiPageWikiLink DSS1.
- DASS2 wikiPageWikiLink DSS2.
- DASS2 wikiPageWikiLink Digital_Private_Network_Signalling_System.
- DASS2 wikiPageWikiLink Digital_Subscriber_System_No._1.
- DASS2 wikiPageWikiLink Digital_Subscriber_System_No._2.
- DASS2 wikiPageWikiLink ETSI.
- DASS2 wikiPageWikiLink ETS_300_102.
- DASS2 wikiPageWikiLink Europe.
- DASS2 wikiPageWikiLink ITU-T.
- DASS2 wikiPageWikiLink Integrated_Services_Digital_Network.
- DASS2 wikiPageWikiLink PSTN.
- DASS2 wikiPageWikiLink Protocol_(computing).
- DASS2 wikiPageWikiLink Public_switched_telephone_network.
- DASS2 wikiPageWikiLink Q.931.
- DASS2 wikiPageWikiLinkText "DASS2".
- DASS2 wikiPageWikiLinkText "Digital Access Signaling System 2 (DASS2)".
- DASS2 wikiPageWikiLinkText "Digital Access Signalling System 2".
- DASS2 hasPhotoCollection DASS2.
- DASS2 wikiPageUsesTemplate Template:BT_Group.
- DASS2 wikiPageUsesTemplate Template:Unreferenced.
- DASS2 subject Category:BT_Group.
- DASS2 subject Category:Integrated_Services_Digital_Network.
- DASS2 hypernym Protocol.
- DASS2 type Article.
- DASS2 type Company.
- DASS2 type Software.
- DASS2 type Article.
- DASS2 type Company.
- DASS2 type Protocol.
- DASS2 comment "Digital Access Signalling System 2 (DASS2) is an obsolescent protocol defined by British Telecom for digital links to PSTN based on ISDN. Although still available on request, it has been superseded by ETS 300 102 ("EuroISDN").DASS2 is an improved version over DASS1, based on experiences with DPNSS. In the UK, the ISDN concept was first introduced to customers by BT with theirDASS2 connections. DASS2 (Digital Access Signalling System) is a BT designedsignalling standard.".
- DASS2 label "DASS2".
- DASS2 sameAs m.02gxw.
- DASS2 sameAs Q5204327.
- DASS2 sameAs Q5204327.
- DASS2 wasDerivedFrom DASS2?oldid=492982632.
- DASS2 isPrimaryTopicOf DASS2.