Private branch exchanges for connection to the British Telecommunications public switched telephone network. Facilities on private branch exchanges. Specification for facilities on private branch exchanges with terminating stations treated as an entirety.
NORMA vydaná dňa 15.2.1993
Designation standards: BS 6450-5.1:1993
Note: NEPLATNÁ
Publication date standards: 15.2.1993
The number of pages: 32
Approximate weight : 96 g (0.21 lbs)
Country: British technical standard
Kategória: Technické normy BS