JPS6032376B2 - Dual ring signaling system for important lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double paging signaling system for important lines from a headquarters to a terminal in an emergency command communication device or the like.

In general, in emergency command and communication equipment, commands from headquarters to terminals are sent not only by telephones but also by loudspeaker amplifiers, and a method is implemented in which the loudspeaker amplifier is automatically activated by a signal from the headquarters, and voice commands are immediately issued from the speakers. There is.

However, with this method, if the loudspeaker amplifier activation circuit of the terminal is inoperable due to a failure or the like, a situation may occur in which the command is not transmitted in an emergency. An object of the present invention is to eliminate the above-mentioned disadvantages, that is, to provide a dual paging signaling system for important lines that reliably transmits emergency messages to terminals.

In order to achieve such an object, the present invention includes a command desk in the head office, a command line device for transmitting signals to the terminals and detecting non-operation on the terminal side, and a signal (specific frequency within the audio band) transmitting control device. It is characterized in that it is provided with a telephone, a loudspeaker, and a public address device connection control device on the terminal side. When a command is given to a terminal from the command desk, a loudspeaker activation signal is first sent from the command line device. If this signal activates the activation circuit in the terminal's loudspeaker connection control device, communication will occur via the loudspeaker, but if the activation circuit is not activated, this will be detected and the system will automatically The telephone is configured to send out a ringing signal (75V, 2 signals per 16 days). This makes it possible to implement a dual paging signaling system for important lines, eliminating errors in information transmission. Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a relay system diagram for explaining one embodiment of the present invention.

In Fig. 1, the headquarters has a command desk DISP. BDn command line device DISP, signal sending control device SG, CONT voice device starting oscillator OSC, telephone bell ringing signal R
, and the terminal is equipped with a telephone TEL and a public address system connection control device AMP. C. AMP as a public address system, speaker SP
has been established. Command desk DISP. When BD issues a command to the terminal, shoulder number transmission control device SO. CONT constitutes the timing circuit for the loudspeaker activation signal sending time, response monitoring time, and telephone bell ringing signal sending time.
Based on this information, the command line device DISP sends out a loudspeaker activation signal to the terminal for a certain period of time. The terminal transmits this signal to the loudspeaker amplifier connection control device AMP. Received at C,
When the loudspeaker AMP is connected, a response signal indicating connection K is returned to the command line device DISP. At this time, if the command line device DISP is inoperable due to some kind of situation such as a failure, the command line device DISP monitors the response signal for a certain period of time after sending the activation signal, and if no response signal is received, it automatically sends out a telephone bell ringing signal. do. FIG. 2 is an implementation circuit diagram for transmitting and receiving a double paging signal according to the present invention.

In FIG. 2, the command board DISP. When issuing a command from BD to a terminal, first operate the line key K on the command console to operate the D relay of the command line device DISP to form a communication path. Next, the signal sending key K2 is operated to operate the timing circuit activation relay TA of the signal sending control device SGCONT. When this activation relay TA operates, it activates a signal OSC sending relay TB consisting of a specific frequency within the audio band that activates the public address amplifier on the terminal side, and thereafter sequentially activates the timing relays TC to TE.
The signal sent from the headquarters side is sent to the signal transmission control device SGC.
The operation of the ONT's TB relay operates the signal sending relay S on the command board, and the signal is sent to the terminal side via the command line device DISP. On the other hand, at the terminal, this signal is received by the specific frequency receiving means of the loudspeaker amplifier connection control device AMPC connected in parallel to the telephone line, and the output drives the line loop closing relay AS. In this way, at the terminal, the DC loop for the line is closed at the AS contact, and the amplifier AM circuit is closed. Connect the SP to the line and prepare to receive emergency commands. In the line dispatcher, a response monitoring relay A detects a response from the terminal. However, in such a case, the A relay of the line dispatcher DISP will not work unless the loop to the headquarters dispatcher is closed due to a device failure in the AMPC, a failure in the relay AS, a power failure, etc. Therefore, the B position relay cannot operate either. In addition, in the timer circuit (TA to TF relay) in the signal transmission control device SGCONT on the headquarters side, the response monitoring relay TF of the terminal is operated by the operation of the TA relay, and the TE
It will continue to operate until the relay operates. As a result, even if the timing relay TD for sending out the telephone call signal of the terminal operates, the tf contact does not send out the bell ringing signal. If response confirmation is still not obtained in this condition, that is, if the A relay does not operate until the TF relay is restored, the bell ringing signal sending relay R of the command line DISP is operated for the operating time of the TD relay, and then for the set time. Sends a bell ringing signal CR. When the terminal side responds with the telephone TEL, the ring trip relay RA operates as is known, and the B position relay is driven by the ra contact to stop sending out the calling signal. In this way, when transmitting a specific frequency, the TA to TF relays in the timing circuit operate in sequence, the TB relay transmits the AMP activation signal, the TF relay monitors the response of the terminal, and the TD relay transmits a telephone ringing signal. , make a loudspeaker call for a certain period of time, and if there is no response, switch to a telephone call,
Double calling to important lines becomes possible.

As described above, according to the present invention, emergency commands can be issued more reliably on important lines, and immeasurable effects are expected in terms of safety management in signal transmission.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram explaining one embodiment of the present invention, and FIG.
The figure is a diagram showing an embodiment of a dual signal sending circuit according to the present invention. Explanation of symbols, headquarters, DISP. BD: Command desk, DISP
: Command line device, D. AMP: Command amplifier, SGCO
NT: Signal transmission control device, OSC: Oscillator for loudspeaker activation signal, CR: Telephone bell ringing signal, terminal, TEL
:Telephone, AMP. C: Public address device connection control device, AMP
: Public address system, SP: Speaker. Hakama' Zuhatsu? figure

Claims (1)

[Claims] 1. In a call signal system from the headquarters issuing the emergency command to a terminal equipped with a public address system and a telephone, the terminal side activates the public address system and the device at a specific frequency within the audio band, and closes a direct loop to the line. A connection control device is provided at the headquarters, and a first signal sending means, a line command device that monitors the response of the terminal, a timing circuit that performs monitoring for a certain period after sending the first signal, and a first signal sending means based on the monitoring result. 2. A double ringing signal system for important lines, characterized in that a telephone ring signal is sent from a headquarters to a line that is not connected to a DC loop to make a telephone call.