Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Specification for general requirements.
NORMA vydána dne 15.2.1993
Designation standards: BS 6450-1:1993
Note: NEPLATNÁ
Publication date standards: 15.2.1993
The number of pages: 40
Approximate weight : 120 g (0.26 lbs)
Country: British technical standard
Kategorie: Technické normy BS