BS 6450-7:1984
Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators, Specification for the procedure of in-service observation for PBXs undergoing type approval
Specifies the assessment of PBXs against the integrity of service requirements in BS 6450:Part 1:1983 and the observation of PBXs against appropriate Parts of BS 6450 under operational conditions.
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