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
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Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators.Facilities on private branch exchanges-Specification for facilities on private branch exchanges with terminating stations treated as an entirety
Document status: Active
Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Simple call-routeing mode (SCRM)-Specification for the simple call-routeing mode of PBX operation, with terminating stations treated as an entirety
Document status: Active
Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators. Simple call-routing mode (SCRM).-Specification for the simple call-routing mode of PBX operation, with terminating stations treated as an entirety
Document status: Active
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
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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
Document status: Active
Specification for netting and fibre rope load restraint systems in surface transport
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Specification for reconstructed stone masonry units
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Fire hazard testing for electrotechnical products. Test methods-Bad-connection test with heaters
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Ordinary duty 250-volt cartridge fuses (rated up to 5 amperes) for a.c. and d.c. service
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