| 摘要 |
PURPOSE:To save the space for installation of telephone sets by unifying an emergence telephone device and a maintenance telephone device. CONSTITUTION:For a device provided with a line monitor part LN for telephone TEL containing buttons, switch part SW, originating register part OR and a control part CO; a relay H is not actuated unless the button B of the TEL is pressed within a fixed period during which a relay TM is released after a connection is given to the originating register OR. Then the signal is fed to the part CO through contacts tm<2> and ha<1>. The part CO identifies a call to be given to an attendant board for emergency telephone and connects the call. The relay H is actuated if the button B is pushed within a fixed period during which the relay TM is released. Then a realy HA works through contacts h<0>, b<0> and tm<0>. The register OR identifies a call of a maintenance telephone and transmits no signal for call to the attendant board of emergency telephone to the part CO. Thereafter, the dial reception is accepted from the telephone TEL. |
