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ETSI EN 300 402-4
M00002085
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ETSI EN 300 402-4 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
standard by European Telecommunications Standards Institute, 11/01/1999
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