Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for general requirements.
STANDARD published on 1.9.1988
Designation standards: BS 6450-1:1983
Note: WITHDRAWN
Publication date standards: 1.9.1988
The number of pages: 27
Approximate weight : 81 g (0.18 lbs)
Country: British technical standard
Category: Technical standards BS