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Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for the procedure for in-service observation of PBXs undergoing type approval
BS 6450-7 – Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Specification for the procedure for in-service observation of PBXs undergoing type approval
Specifies the assessment of PBXs against the integrity of service requirements in BS 6450-1:1983 and the observation of PBXs against appropriate Parts of BS 6450 under operational conditions.
