1990 Edition, October 28, 1990
Private Branch Exchanges for Connection to Public Switched Telephone Networks Run by Certain Public Telecommunication Operators Part 7: Procedure for In-Service Observation for PBXs Undergoing Type Approval
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Description / Abstract:
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.