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ETSI ETS 300 172
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Circuit-mode basic services [ISO/IEC 11572 (1994) modified]
- standard by European Telecommunications Standards Institute, 11/01/1995
- Publisher: ETSI
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This European Telecommunication Standard (ETS) defines the layer 3 protocol for signalling for the support of circuit-mode bearer services (used either on thei own or in support of teleservices) at the Q reference point between Private Telecommunication Network eXchanges (PTNX) connected together within a Private Telecommunication Network (PTN). The Q reference point is defined in ETS 300 475-1.