DIN EN 300138-5:2002-12
Действует
Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Closed User Group (CUG) supplementary service - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement of the English version EN 300138-5 V 3.1.1 (2002-04) as German standard)
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