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Private branch exchanges for connection to the British Telecommunications public switched telephone network. Facilities on private branch exchanges. Specification for facilities on private branch exchanges with terminating stations treated as an entirety
BS 6450-5.1 – Private branch exchanges for connection to the British Telecommunications public switched telephone network. Facilities on private branch exchanges. Specification for facilities on private branch exchanges with terminating stations treated as an entirety
Specifies requirements for facilities on PBXs within the scope of BS 6450-2:1993. This standard has been presented for designation under the Telecommunications Act 1984.
