DIN EN 300052-4:1999-12
Отменен
Integrated Services Digital Network (ISDN); Multiple Subscriber Number (MSN) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user (Endorsement of the English version EN 300052-4 V 1.2.4 (1998-06) as German standard)
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