DIN EN 300402-4:2000-10
Действует
Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Data link layer - Part 4: Protocol Implementation Conformance Statement (PICS) proforma specification for the general protocol (Endorsement of the English version EN 300402-4 V 1.2.3 (1999-11) as German standard)
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