Abstract :
By means of specially devised translators, described in this paper, 3-element cable-code signals may be translated into 2-element signals suitable for transmission over ordinary landline telegraph plants; by means of retranslating circuits, also described, the signals may be restored to their original 3-element form. Signals in the 2-element form may be monitored without the aid of retranslators. Synchronism is not required between the translators and retranslators.
