Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Specification for private branch exchanges with terminating stations treated as an entirety.
NORMA vydána dne 15.2.1993
Designation standards: BS 6450-2:1993
Note: NEPLATNÁ
Publication date standards: 15.2.1993
The number of pages: 32
Approximate weight : 96 g (0.21 lbs)
Country: British technical standard
Kategorie: Technické normy BS