JPS62200852A - Key telephone set used at power failure - Google Patents

Abstract

PURPOSE:To improve the operability by detecting the interruption of a power on a data line so as to control a dialing means so as to be operated automatically thereby eliminating the need for troublesome operation of a power failure switch and enabling dialing to be sent at power failure. CONSTITUTION:If a DC power supply fed to data lines 12, 13 is interrupted, a photocoupler 49 is turned off and a hook switch 51 is turned on, then a signal on a line 62 goes to a low level and a dialing circuit 60 is operated. If a dial input is given from a key pad 16 in this state, a dial pulse is generated from the circuit 60 in response thereto, the dial pulse is fed to a gate of a field effect transistor (TR) 64 via a line 63. The TR 64 is turned on when the dial pulse generated from the circuit 60 is at a high level and turned off when at a low level. A TR 65 is turned on/off in response to the ON/OFF of the TR 64 and TR 57 is turned on/off further, then a desired dial pulse signal is generated on talking lines 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a power outage telephone of a key telephone device which is connected to the main unit of the key telephone device and is capable of dialing out and receiving calls during a power outage.

(Prior Art) In general, a button telephone device is composed of one main device 2 and a plurality of button telephones 3.4, as shown in FIG. and button telephone 3
, 4 are connected via communication lines 5.5' and data lines 6, 6'. The main device 2 controls the connection between the central office line 1 and the key telephone 3 or 4, and also controls the connection between the key telephones 3 and 4. For example, when connecting the office line 1 and the key telephone 3, a communication path 7 is formed in the main device 2 to connect the office line 1 and the telephone line 5 connected to the key telephone 3.

In addition, when the main device 2 borrows data in advance from the central office line 1, the main device 2
．． An incoming voice signal is sent to the desired button telephone 3 or 4 via the button telephone 3 or 4, and when a call is made from the button telephone 3 or 4, the signal is sent from the key telephone 3 or 4 to the data line 6 or 6'. dial information is sent to the main device 2,
Main device 2 receives this dial information, generates a dial pulse or dial tone, and sends it to station I@1.

Further, the power supply for the button telephone device 3.4 is provided by the data line 6,
6' from the main device 2.

As described above, since the normal key telephone device does not have a direct interface with the central office line 1, that is, a dial originating circuit and an incoming call circuit, it is not possible to make dialing and incoming calls during a power outage. Therefore, normally, at least one of the key telephones 3.4, for example, the key telephone 3, is constructed as a power outage telephone capable of dialing and receiving calls even during a power outage.

FIG. 5 shows the configuration of a power outage button telephone 3, which is a conventional power outage telephone, and includes an incoming call circuit and a dial outgoing circuit at the time of a power outage, and is connected to a two-wire telephone line 5, a telephone line 10 and 11. It is equipped with a communication circuit 14 that controls the transmission and reception of signals on the communication line 5 and a data circuit 15 that is connected to the data line 6 consisting of two data lines 12 and 13 and controls the transmission and reception of data and signals on the data line 6. It consists of Further, the keypad 16 is composed of two insulated make contacts, and the signal from one make contact is applied to the communication circuit 14 via the key power line 17, and the signal from the other make contact is applied to the keypad. It is applied to the data circuit 15 via a power line 18. Further, the output signal of the function key 19 is applied to the data circuit 15 via a key power line 20.

Furthermore, the communication circuit 14 is provided with a manually operated power outage switch 21. In such a configuration, under normal conditions (non-power outage)
, the power outage switch 21 is turned off, and at least the dialing circuit out of the incoming call circuit (not shown) and the dialing circuit (not shown) in the telephone call circuit 14 is rendered inoperable. Therefore, when there is a dial input using the keypad 16 during normal operation, the output from the keypad 16 (No. 8 is applied to the data circuit 15 via the key power line 18, and dial information from the data circuit 15 is sent to the data line 6. The output signal from the keypad 16 is input to the telephone call circuit 14 via the key power line 17, but the dialing circuit in the telephone call circuit 14 is not connected. Since it is in operation, a dial signal is not directly sent to the telephone line 5. That is, in this case, the power outage key telephone 3 has the same function as a normal key telephone.

In the event of a power outage, the user manually turns on the power outage switch. As a result, the dialing circuit within the telephone call circuit 14 becomes operational. Therefore, for example, when there is a dial input from the keypad 16, this dial input is input to the key force line 17.
The dialing circuit 14 in the calling circuit 14 sends the dialing signal to the calling line 5.

This allows dialing even during power outages. Furthermore, since the telephone call circuit 14 is equipped with an incoming call circuit, it can also respond to incoming calls from the telephone line 5.

However, the above-mentioned conventional power outage button telephone cannot make a dial call unless the power outage switch is operated during a power outage, and has a problem in operability.

(Problems to be Solved by the Invention) As described above, the conventional button device power outage telephone required the user to manually switch the power outage switch when making a dial call.

Therefore, an object of the present invention is to provide a power outage telephone of a button telephone device that does not require operation of a power outage switch.

[Structure of the Invention] (Means for Solving the Problems) The power outage telephone of the button telephone device of the present invention is provided with means for detecting the presence or absence of power supply from the data line, and the output of this means sends a dial signal to the telephone line. The system controls the dialing means that sends out the .

(Function) Therefore, in the event of a power outage, the dial signal generating means becomes automatically operable, and dialing can be made without the need to operate a power outage switch.

(Embodiment) FIG. 1 shows an embodiment of a power outage telephone of a button telephone device according to the present invention. In this embodiment, the power out switch is eliminated and a control line 30 is provided instead from the data circuit 15 to the call circuit 14.

Details of the data circuit 15 and speech circuit 14 are shown in FIGS. 2 and 3.

In FIG. 2, when there is a dial input from the keypad 16, the output of this keypad 16 is output to the control circuit 4.
0, data output line 41, data transformer 42
The data is output via data lines 12 and 13E. Further, the audio advance signal sent from the main device 2 (Fig. TS4) via the data lines 12, 13 is applied to the speaker 44 via the audio transformer 43, and a ring tone is generated from the speaker 44.

Further, the DC power supplied from the main device 2 (FIG. 4) to the data lines 12 and 13 is applied to the control circuit 40 via a regulator 45, and the output of the regulator 45 is connected to a current limiter resistor 46 and a zener for voltage detection. It is added to a photocoupler 49 via a diode 47. Here, a resistor 48 connected in parallel to the photocoupler 49 is a resistor for setting the sensitivity of the photocoupler 49.

Therefore, when DC power is applied to the data lines 12 and 13, the photocoupler 49 is on.
When DC power is no longer applied to the data lines 12 and 13 due to a power outage or the like, the photocoupler 49 is turned off.

In Figure 3, 50.51 is a hook switch,
The illustrated state shows the state in which the handset 59 is on-hook. During a power outage, the incoming signal is output from the main device 2 (Fig. 4) to the communication line 10°11, and this incoming signal is applied to the diode bridge 53 via the hook switch 50 and the capacitor 52, and is converted into DC. Phosphorus is added to circuit 54 and causes sounder 55 to ring.

Note that when there is not a normal power outage, the main device 2 (FIG. 4) is configured not to output incoming signals to the communication lines io and tt, so the sounder 55 does not ring.

In a state other than a normal power outage, the photocoupler 49 is on as explained in FIG. 2, and the line 62 is therefore at a high level.

The signal on this line 62 is applied to a reset terminal of a dial transmission circuit 60 to which power is supplied from a constant current circuit 61. As a result, the dialing circuit 60 is inoperative. Therefore, even if there is a dial input from the keypad 16, the dial transmission circuit 60 does not operate.

When the DC power applied to the data 7 line 12, 13 is cut off and the photocoupler 49 is turned off, the signal on the line 62 changes while the hook switch 51 is in the state.

First, when the hook switch 51 is off, that is, when the handset 59 is on-hook, the signal on the line 62 is at a high level, and the dialing circuit 60 is inactive.

The hook switch 51 is on, that is, the node set 5
9 goes off-hook, the signal on line 62 goes low and dialing circuit 60 becomes operational. When a dial is input from the keypad 16 in this state, a dial pulse is generated from the dial transmission circuit 60 in response to this, and this dial pulse is applied to the gate of the field effect transistor 64 via the line 63. The field effect transistor 64 is turned off when the dial pulse generated from the dial transmission circuit 60 is at a high level and turned off when it is at a low level. This field effect transistor 6
Transistor 65 is turned on and off in response to turning on and off of communication line 10.
A desired dial pulse signal is generated at 11. This allows dialing even during power outages.

Note that when off-hook, the telephone line 10.11 is connected to the telephone circuit 5 via the diode bridge 56 and the transistor 57.
The handset 59 is connected to the mobile terminal 8, and calls can be made using the handset 59.

In addition, in Fig. 2, a photocoupler 49 for detecting power failure is shown.
Although this is provided after the regulator 45, it may be provided before the regulator 45.

Furthermore, although the operation of the incoming call circuit is controlled by the main device, it may also be controlled by the power outage telephone, similar to the dialing circuit.

[Effects of the Invention] As explained above, according to the present invention, the power-off of the data line is detected and the dialing means is controlled to be automatically operable, thereby eliminating the troublesome operation of the power outage switch. This has the excellent effect of making dialing possible during a power outage without the need for , and improving operability.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG.
FIG. 3 is a detailed circuit diagram of the main part of the embodiment shown in FIG. 1, FIG. 4 is a diagram showing an outline of the key telephone device, and FIG. 5 is a block diagram showing the inside of a conventional power outage telephone. 1... Line, 2... Main device, 3, 4... Button telephone, 5.5'... Call line, 6, 6'... Data line, 49... Photo coupler, 54 ...Rin is a circuit, 6
o...Dial transmission circuit.

Claims (1)

[Claims] In a power outage telephone of a button telephone device that is connected to the main device via a speech line and a data line and receives power from the main device via the data line, a dial signal is generated in response to keypad operation. and dialing means for transmitting this to the communication line; power supply detection means for detecting the presence or absence of power supply from the data line; and when the power supply detection means detects that power supply from the data line is present; deactivating the dial generating means;
A power outage telephone of a key telephone device, further comprising a control means for operating the dial generation means when no power is being supplied from the data line.