Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators.Facilities on private branch exchanges. Specification for facilities on private branch exchanges with terminating stations treated as an entirety.
NORM herausgegeben am 30.9.1988
Designation standards: BS 6450-5-5.1:1984
Note: UNGÜLTIG
Publication date standards: 30.9.1988
The number of pages: 40
Approximate weight : 120 g (0.26 lbs)
Country: British technical standard
Kategorie: Technische Normen BS