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.
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BS 6450-1:1983
Original price was: $264.16.$132.00Current price is: $132.00.
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
Pages: 27
