DIN EN 301145-2:2001-09
Действует
Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Teleaction service - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorsement of the English version EN 301145-2 V 1.1.4 (1999-03) as German Standard)
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