BS 6450-1:1983

Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators-Specification for general requirements

BSI Group , 09/01/1988

$132.00 $264.16

Specifies the requirements necessary for correct interworking with the analogue interfaces of the PSTN. Does not apply to PBXs for connection to shared service lines or 1 + 1 carrier systems, or to PBXs for connection in parallel with any other apparatus whose ringer equivalence number exceeds 0.3.