Integrated Services Digital Network (ISDN). Digital Subscriber Signalling System No. one (DSS1) protocol. Signalling network layer for circuit- mode basic call control. Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]
STANDARD published on 1.7.2002
Designation standards: STN EN 300403-1-V1.2.2
Classification mark: 870403
Catalog number: 20242
Publication date standards: 1.7.2002
The number of pages: 80
Approximate weight : 240 g (0.53 lbs)
Country: Slovak technical standard
Category: Technical standards STN