BS 6450-7 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
Additional Comments: W/D NO S/S
Published By:British Standards Institution (BSI)
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.