Interface of remote control for telephonic station that permits transmission of alarm has comparator that detects cut-off action and time switch after some delay produces via relay alarm buzz on control station

摘要

A coupling device (102,103) is used for coupling to a sector. A device (101) cut-off this coupling under a control of an alarm signal. A comparator (104) detects this cut-off action. Time switch (105) after some delay produces via a relay (106) an alarm buzz on a remote station.