Signalling by currents in one or other or both line wires or additional wires

Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange > with direct connection for all subscribers, i.e. party-line system > Signalling by currents in one or other or both line wires or additional wires

Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange > with direct connection for all subscribers, i.e. party-line systems (H04Q5/24 takes precedence) > Signalling by currents in one or other or both line wires or additional wires