New voice-frequency telegraph system

In the new system the speed of signalling remains at 70 bauds per channel, the carrier frequencies are spaced more closely together and are odd harmonics of 60 p.p.s. instead of 85 p.p.s. The system meets the requirements of the C.C.I.T. It can be used on a 4-wire loaded, repeatered cable circuit or on a 2-wire circuit and is intended to provide up to 18 2-way telegraph circuits on a 4-wire cable circuit. The general principle of operation of the system remains the same as that of its predecessors.