JPH03235494A - Key telephone system - Google Patents

Abstract

PURPOSE:To make a response to a trunk line by means of one specified telephone set by operating a trunk line switching latching relay by means of a call signal from the trunk line, which arrives at the time of a power failure identifying a termination call by means of a trunk line voltage identification circuit and returning the relay to an initial state. CONSTITUTION:At the time of the power failure, a constant voltage circuit 36 does not operate and a power on reset relay 34 is turned off. Then, a relay contact rl2 is connected to a B-side. Since photocouplers PH1 and PH2 are turned off, only a transistor Q1 is turned on and the trunk line switching latching relay circuit 33 is set. Then, a relay contact rl1 is connected to an S-side and the trunk line L2 is connected to T1/R1. When the receiver 31 of a telephone set 22 is hooped off in such a state, a call loop is generated by the trunk line L2 T1/R1 a hook switch 32 a call/dial circuit 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a button telephone device capable of accommodating two or more office lines.

BACKGROUND OF THE INVENTION FIG. 2 shows the structure of a conventional key telephone device. In FIG. 2, 1 is the main device and 2 is a telephone. 3 is a power outage ringer circuit for the office line R1, 4 is a power outage ring circuit for the office line R2, 5 is a sounder connected to the power outage ringer circuit 3, and 6 is a sounder connected to the power outage ringer circuit 4. −
It is. C1 is a capacitor of 3μF or more, and R1 is a resistor of 2Ω or more. 7 in the telephone 2 is a call/dial circuit that operates by supplying power from the central office line, 8 is a constant voltage circuit that operates by supplying potential from the main device 1, and 9 is a central telephone line Ll, L.
2, the station line switching relay 10 switches between the station line Ll and
or a power outage operation setting switch that sets the response and transmission of the office line L2; 11 is a relay control circuit that outputs a control signal to the office line L1 or office line L2 to the office line switching latching relay 9 in the event of a power outage using the power outage action setting switch IO; It is.

Next, the operation of the conventional example during a power outage will be explained. In FIG. 2, a power outage operation setting switch 10 of the telephone 2 is set when power is applied. For example, if you set it to station line Ll,
When the voltage within the telephone 2 falls below a certain specified level, the relay control circuit 11 outputs a heliset output of the office line switching latching relay 9, and the relay contact rl of the office line switching latching relay 9 is connected to the office line L1. . As a result, when an incoming call is placed on the central office line L1, a ringer tone is heard from the sounder 5 due to the power outage ringer circuit 3 in the main device 1, and when the receiver 12 is picked up, the hook switch 13 meters and a call loop is established. Calls can be made.

In this way, when making a call during a power outage, simply by lifting the handset 12, the central office line determined by the power outage operation setting switch 10 is acquired, and the telephone call can be made on the central office line.

Problems to be Solved by the Invention However, in the conventional button telephone device, the central office line response in the event of a power outage is set for each telephone, so there is a problem that the central office line that can be answered is fixed and only one central office line can respond. was there.

The present invention is intended to solve such conventional problems, and an object of the present invention is to provide an excellent key telephone device that can respond to an incoming central line call from any telephone during a power outage. It is something to do.

Means for Solving the Problems In order to achieve the above object, the present invention includes, in the main device, a station line switching latching relay that operates only in the event of a power outage, one circuit for power outage, and a power-on reset circuit. By providing a central office line voltage identification circuit, and also equipping the telephone with a call/dial circuit that operates by power supply from the central office line, and a central office line switching relay circuit that is connected to a specific central office line in the event of a power outage, During a power outage, any call received from any central office line could be answered using 10 specific telephones.

Therefore, according to the present invention, by operating the office line switching latching relay in response to a calling signal from the office line during a power outage, the telephone can respond to the office line, and the telephone can respond to the office line by using the office line voltage identification circuit. By performing call identification and returning the central office line switching latching relay to its initial state, it is possible to respond to an incoming central telephone call during a power outage using one specific telephone.

Example FIG. 1 shows an embodiment of the present invention.

In FIG. 1, 21 is the main device, 22 is a telephone set, 23 is a power outage ring circuit for the office line L1, 24 is a power outage ringer circuit for the office line L2, and 25 is a sounder connected to the power outage ringer circuit 23. 26 is a sounder connected to the power outage ringer circuit 24, and a sounder 27 is a telephone /
The dial circuit 28 is a constant voltage circuit operated by power supplied from the main device 21. Reference numeral 29 is a station line switching relay that switches between the station lines Ll and L2, and in the event of a power outage, the station line L1 side (T
'l, R1). 30 is a relay control circuit for switching to the central line L1 or L2 when energized. 31
is a telephone receiver, and 32 is a hook switch.

On the other hand, in the main device 21, 33 is connected to the central office line L1 during a power outage.
A station line switching latching relay circuit that switches between and L2,
34 is a power-on reset relay. 35 is a station line voltage identification circuit for the station line L2, and is a circuit that outputs a one-shot signal to the photocoupler PH3 only when the telephone set 22 opens the loop. 36 is a constant voltage circuit.

Next, the operation of the above embodiment will be explained.

First, in the energized state, the constant voltage circuit 3 is connected to the AC 100V power supply.
6, a constant voltage Vo is generated, and the power-on reset relay 34 is turned on. Power-on reset relay 3
When 4 is turned on, its relay contact ``12'' is connected to the M side, and the relay RL of the station line switching latching relay circuit 33 is connected to the M side.
Vo is applied to the power supply of 1. During power supply, photocoupler PH2 is on, so VD -R3→C3-PH2
A current flows to -Q2, transistor Q2 is turned on for a certain period of time, and relay contact rj+l of station line switching latching relay circuit 33 is connected to the R side. Here, photo coupler P
Since H1 is on, transistor Q1 does not turn on.

Since the office line L1 is connected between Tl/R1 and the office line L2 is connected between T2/R2, the capture of office lines L1 and L2 when energized is performed by the relay control circuit 30 of the telephone 22 via the office line switching relay. 29, the communication loop is switched to the central office line L1 or the central office line L2.

Next, the operation during a power outage will be explained. When a power outage occurs, the constant voltage circuit 36 stops working, the power-on reset relay 34 turns off, and its relay contact RL! 2 is connected to the B side, and the relay power supply is connected to the power of the power outage ringer circuit 24 of the station line L2 after passing through the parallel circuit of diode D1 and high resistance R2, and the integration circuit via large capacity capacitor 02. . In addition, in a power outage state, the photocoupler PH
2 is off, and in standby mode during a power outage, the station line Ll is T.
To I/'R1, office line L2 is connected to 72/R2.

Further, in the telephone 22, since the office line switching relay 29 is in an OFF state, its relay contact r1 is connected to the B side and connected for the office line R1. ° This causes the call/dial circuit 27 to be connected to Tl/R1 when the handset 31 is lifted. When a call is received on the office line L1, the office line ringing tone is played from the office line R1 sounder 25, and when the receiver 31 of the telephone set 22 is lifted, the office line L1 can be picked up.

The process up to this point is the same as the conventional example, but when a call is received on the office line L2, the 75V, 16H2 signal from the office line L2 turns on the -24 power outage ring for the office line R2, and the sounder for the office line R2 turns on. A ringtone comes from -26. At the same time, the rectified DC voltage is applied to the input of the power failure ringer 24 to the break contact B of DI-C2 plus-r12, and a current flows through R4-C4. In addition, at the time of a power outage, since both photocouplers PH1 and PH2 are off, only the transistor Q1 is turned on, and the office line switching latching relay circuit 33 is set, its relay contact ri71 is connected to the B side, and the office line L2 is connected to Tl/ It is now connected to R1 and T2/R2.

If you pick up the handset 31 of the telephone 22 in this state, the station line R
2-Tl/R1-hook switch 32-talk/dial circuit 27 creates a call loop. and receiver 3
1 and end the call, the station line voltage identification circuit 35 is activated.
The photocoupler PH3 is turned on in one shot, the transistor Q2 is also turned on in one shot, the office line switching latching relay circuit 33 returns to the reset state, and the relay contact r1 is turned on.
1 is connected to the R side, office line L1 is Tl/R1, office line L2
is connected to T2/R2 and enters the standby state.

In this way, according to the embodiment, by controlling the ON/OFF state of the office line switching latching relay circuit 33 during a power outage, it is possible to respond to incoming calls on the office lines L1 and R2 using one telephone set 22. have

Furthermore, even if there are three or more central office lines, a similar system allows one specific telephone to respond to any central office line.

Effects of the Invention As is clear from the embodiments described above, the present invention has the advantage that no matter which office line receives an incoming call during a power outage, it can be answered without any settings on one specific telephone.

Furthermore, by increasing the number of switching relays, it becomes possible to respond to three or more station lines.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a key telephone device according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional key telephone device. 21... Main device, 22... Telephone, 23... Office line L1m power outage ringer-124... Office line R2 power outage ringer -25.26... Sounder -27... From the office line Call/dial circuit that works with power supply, 28...constant voltage circuit,
29... Office line switching relay 30... Relay control circuit, 31... Receiver, 32... Hook switch, 3
3...Latching relay circuit for switching station lines during power outage, 34
... Power-on reset relay 35 ... Office line voltage identification circuit, 36 ... Constant voltage circuit.

Claims (1)

[Claims] The main device is equipped with a central line switching latching relay circuit that operates in response to a call signal from the central line only in the event of a power outage, a power outage ringer circuit, a power-on reset circuit, and a central line voltage identification circuit. , a button telephone device equipped with a call/dial circuit that operates by power supply from a central office line, and a central office line switching relay circuit that is connected to a specific central office line in the event of a power outage.