A draft amendment to BS 6305:1992 "Specification for general requirements for apparatus for connection to public switched telephone networks run by certain public telecommunications operators"— 20 стр.
Specification for general requirements for apparatus for connection to public switched telephone networks run by certain public telecommunication operators— 44 стр.
Specification for modems for connection to public switched telephone networks and speech band private circuits run by certain public telecommunications operators— 16 стр.
