Digital Private Network Signalling System (DPNSS)

During the 1980s, British Telecom and PINX manufacturers in the UK developed DPNSS, the Digital Private Network Signalling System, as an open standard. DPNSS was developed before ISDN was fully defined and before a basic QSIG definition was available, but its facilities were needed by private network customers who wished to make use of digital networks as soon as possible. DPNSS is rich in standardised supplementary services and its information flows have been used as the basis of work on the QSIG protocols. Interworking between the two systems has been specified.

DPNSS is defined in four documents that are available to any manufacturer, and many manufacturers have taken the opportunity to develop interfaces that conform to this open standard. The four documents are:

BTNR 188: Digital Private Networking Signalling System No 1 (Issue 6, January 1995)
BTNR 188-T: Digital Private Networking Signalling System No 1: Testing Schedule
BTNR 189: Interworking between DPNSS1 and other Signalling Systems (Issue 3, March 1988)
BTNR 189-I: Interworking between DPNSS1 and ISDN Signalling Systems (Issue 1, December 1992)

NOTE: We do not supply BTNR documents. They can be obtained directly from: BT plc, Network Standards Secretariat, PP 2C71, Angel Centre, 403 St. John Street, London EC1V 4PL, United Kingdom
tel: +44 207 843 5188 fax: +44 207 843 6557

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