Apparatus for connection to private circuits run by certain public telecommunication operators, Specification for apparatus for connection to telegraph circuits using SCVF signalling— 32 стр.
Connectors for analogue telecommunication interfaces, Sockets for use with plugs specified in BS 6312-1, Particular requirements for fixed socket-outlets used in permanent wiring installations— 22 стр.
Specification for modems for connection to public switched telephone networks and speech band private circuits run by certain public telecommunications operators— 16 стр.
