BS 6450-1 1993 Edition, February 15, 1993
Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators Part 1: Specification for general requirements
Additional Comments: W/D NO S/S
Published By:British Standards Institution (BSI)
Applies to dealer boards and automatic call distributors, but not for connection to shared service lines, 1+1 carrier systems or connection in parallel with other apparatus whose ringer equivalence number exceeds 0.3. This standard has been presented for designation under the Telecommunications Act 1984.