using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Introduced: September 1968

Last revised: January 2006

Full Title

Details of selecting apparatus or arrangements > Electrical details > Signalling arrangements; Manipulation of signalling currents > using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC COMMUNICATION TECHNIQUE
Subclass:: SELECTING