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ETSI ETS 300 804-2
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Circuit mode basic services; Data Link Layer (DLL); Part 2: Abstract Test Suite (ATS) specification
- standard by European Telecommunications Standards Institute, 02/01/1998
- Publisher: ETSI
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Conformance Test Specification (TTCN) for the protocol for layer 2 signalling between exchanges of private integrated services networks for the control of circuit-switched calls.