KR101051444B1 - Lobby phone switching device - Google Patents

Abstract

The present invention is installed between the lobby phone 10 is installed in the door of the apartment house and the household telephone 50 installed for each household, the lobby phone switching to transfer the connection between the lobby phone 10 and the household telephone (50) A device comprising: a lobby phone connection unit (12) for applying a bias current to the lobby phone (10) and the generation telephone (50), and switching the connection of the lobby phone (10); A call signal generator 14 for generating a call signal of the lobby phone 10; A switching relay 16 for switching the generation telephone 50 from the connection with the trunk line 40 to the lobby phone 10; A line monitoring unit 18 for monitoring whether a call between the household telephone 50 and the trunk line 40 is made; A tone generator 20 for generating ring back tones and dial tones; And a switching control unit 28 for controlling the operation of the switching relay 16 to call the generation telephone 50 corresponding to the calling signal when the call signal of the lobby phone 10 is generated. No need to establish new communication line between lobby phone and household phone, it can greatly reduce construction cost, do not invade privacy of household during construction, secure CCTV line without incurring call charge despite using local line It is to have an easy effect.

Lobby phone, transfer device, household telephone, trunk line, security room telephone, transfer relay, micom

Description

Switching apparatus for lobby phone}

The present invention relates to a lobby phone switching device, and more particularly, to a lobby phone switching device of the new method that can perform the transfer of the lobby phone by using a CO line, and the call between the lobby phone and the generation without a separate call charge generation. .

In general, a lobby phone is installed at the entrance of a multi-family house such as an apartment for the purpose of preventing unauthorized intrusion of outsiders. The lobby phone connects the visitor with the household and makes a call. When the householder confirms the visitor's identity, the lobby phone opens the door and allows the visitor to pass through the door.

Commonly known lobby phones are classified into interphone methods and trunk lines according to the connection method between lobby phones and households. In the interphone method, the lobby phone and the household phone are connected to separate communication lines. The interphone-type lobby phone can be installed with a built-in CCTV by using a dedicated communication line, and visitors can be checked while watching the video taken by the CCTV generation. However, it is expensive to install such a lobby phone. For example, in new buildings, dedicated communication lines and data communication lines should be installed, and relatively expensive dedicated communication devices should be installed.

Furthermore, the biggest problem in the intercom system lobby phone is the case of installing the lobby phone in the base building. In this case, there is a problem that the construction cost according to the installation of the lobby phone, as well as the construction for each household is required separately. Therefore, problems such as privacy invasion of each generation and prolongation of construction period are caused.

As a way to solve the problems occurring in the interphone-type lobby phone as described above, a lobby phone using a trunk line has been developed. The lobby phone using the trunk line does not require a separate line work, the construction cost is greatly reduced. However, there is a problem in that a call charge due to using a CO line is imposed and a CCTV cannot be installed.

The present invention has been proposed to solve the above problems, using a conventional phone line without installing a separate dedicated line, using a lobby phone, a new way that is easy to install the built-in CCTV without a call charge Its purpose is to provide a lobby phone switching device.

Lobby phone switching device of the present invention for achieving the above object is installed between the lobby phone 10 is installed in the door of the apartment house and the household phone 50 installed for each household, lobby phone 10 In the lobby phone switching device for switching the connection between the household telephone and the household telephone 50, a lobby phone for applying a bias current to the lobby phone 10 and the household telephone 50 side, and switching the connection of the lobby phone 10 Connection portion 12; A call signal generator 14 for generating a call signal of the lobby phone 10; A switching relay 16 for switching the generation telephone 50 from the connection with the trunk line 40 to the lobby phone 10; A line monitoring unit 18 for monitoring whether a call between the household telephone 50 and the trunk line 40 is made; A tone generator 20 for generating ring back tones and dial tones; And a switching control unit 28 for controlling the operation of the switching relay 16 to call the generation telephone 50 corresponding to the calling signal when the call signal of the lobby phone 10 is generated. .

According to a preferred embodiment, the circuit further comprises a hold circuit 34 for holding the CO line 40 to make a call state during the call between the lobby phone 10 and the household telephone 50.

According to a preferred embodiment, the apparatus further includes a shift register 32 for shifting a predetermined signal to the line monitoring unit 18 of each of the household telephones 50 and detecting a call state of the household telephones 50.

According to a preferred embodiment, the guard room telephone 60 is installed in the guard room of the apartment house; A guard room connection part 24 for applying a bias current to the guard room phone 60 side and switching the connection of the guard room phone 60; And a DTMF receiver 23 for generating a call signal of the guard telephone 60. The relay relay 16 is a guard room telephone 60 from the connection of the household telephone 50 with the trunk line 40. The switch control unit 28 controls the operation of the transfer relay 16 to call the household telephone 50 corresponding to the call signal when the call signal of the guard room phone 60 is generated. do.

According to a more preferred embodiment, it further includes a line monitoring unit 26 for monitoring whether the guard room telephone 60 call.

According to the lobby phone switching apparatus of the present invention, since the lobby phone and the household telephone are connected by using some lines of the trunk line, there is no need to establish a communication line between the lobby phone and the household telephone, and construction cost burden due to the new construction occurs. If you do not, especially if the installation of the lobby phone in the base building is not required for each generation, there is an effect that does not invade the privacy for the household. In addition, the present invention is connected to the lobby phone and the generation phone is directly connected when the switching relay is switched when the call of the lobby phone is generated, by making a call by applying a bias current at the lobby phone connection, using only the trunk line in the building of the trunk line Despite the use of the call rate does not occur.

In addition, according to the present invention, when the lobby phone and the generation phone is in a call, the hold circuit unit may hold the trunk line forcibly to generate a busy signal.

In addition, according to the present invention, a circuit can be configured very simply by generating a call check and output of a plurality of generation telephones using a single shift register.

In addition, when using the switching device of the present invention, it is possible to achieve the call of the household telephone and the construction of a call line with the household telephone by using the CO line, so that a lobby phone is installed in a place where the guard intercom is not installed. We can expect the effect of building interphone lines for guard rooms.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

1 is a block diagram schematically showing a lobby phone switching device according to the present invention, Figure 2 is a circuit diagram illustrating a circuit configuration of the switching device in FIG.

Referring to this, the lobby phone switching device of the present invention is composed of a switching device 11 installed between the lobby phone 10 and the household telephone (50). The switching device 11 alternates the connection between the trunk line 40 and the household telephone 50 to enable a call between the lobby phone 10 and the household telephone 50.

That is, the lobby phone switching device of the present invention is a device that is additionally installed in the call line with the existing CO line 40 without establishing a separate communication line between the lobby phone 10 and the household phone 50, The trunk line 40 and the lobby phone 10 are switched over the telephone 50. In addition, according to a preferred embodiment of the present invention, the switching device 11 may switch the trunk line 40 and the guard room telephone 60 with respect to the household telephone 50.

Referring to FIG. 1, the switching device 11 includes a lobby phone connection unit 12, a call signal generator 14, a transfer relay 16, a tone generator 20, a busy tone generator 22, and a DTMF receiver. (23), the guard room connection unit 24, the transfer control unit 28 and the power supply unit 30, and in addition to the line monitoring unit 18 for monitoring whether or not the call of the household telephone 50, and the guard room telephone ( The line monitoring unit 26 for monitoring whether or not the call of 60 is connected has a configuration.

The lobby phone connection unit 12 switches the connection of the lobby phone 10 and applies a bias current to enable a direct call between the lobby phone 10 and the household phone 50. As shown, a 24V bias power supply is applied to the lobby phone 10 side through the RB1 resistor and to the generation telephone 50 side through the RB2 resistor. When a call is attempted in the lobby phone 10, the relay K1 is switched, and a call line is established with the generation phone 50.

The call signal generator 14 is a means for generating a call signal of the lobby phone (10). The call signal generator 14 supplies the call power (for example, 80V 20Hz) and controls the relay K4 on / off to ring the telephone ring on the receiving side.

The switching relay 16 is a means for switching the connection of the household telephone 50 from the trunk line 40 to the lobby phone 10 side. As shown, the relay SK1 of the ablation relay 16 is normally connected to the trunk line 40. When the relay SK1 performs the switching operation, the connection between the trunk line 40 and the household telephone 50 is cut off, and the household telephone 50 and the lobby phone 10 are directly connected.

At this time, even if a call of the lobby phone 10 occurs, if the household telephone 50 maintains a call state with the trunk line 40, the transfer relay 16 should not operate with respect to the call of the lobby phone 10. Therefore, the line monitoring unit 18 is used to monitor whether the household telephone 50 is in a call. The line monitoring unit 18 for monitoring the call of the household telephone 50 is composed of a rectifier circuit including a bridge diode and a photo coupler PC1.

The tone generator 20 generates a ring back tone and a dial tone, and the lobby phone 10 receives the ring back tone and the dial tone through a transformer T1. The busy tone generator 22 generates a busy tone to notify the user of a call failure.

The transfer control unit 28 is connected to the lobby phone 10 by RS485 communication. The transfer control unit 28 is composed of a microcomputer. The transfer control unit 28 controls the relays in response to the lobby phone 10 to notify the lobby phone 10 of the call, the start of the call, the end of the call, the guard room control information, and the like.

For example, when the call is generated from the lobby phone 10, the transfer control unit 28 calls the generation telephone 50 corresponding to the call signal. At this time, when the line monitoring unit 18 detects that the household phone 50 is in a call, it notifies the lobby phone 10 that it is busy. If the line monitoring unit 18 does not detect that a call is in progress, the switching relay 16 is switched from the trunk line 40 to the lobby phone 10, where the bias current is a resistor RB2-generation telephone-lobby phone-T1. In order to flow the lobby phone 10 and the household phone 50 to make a call on a direct line.

3 is a circuit diagram illustrating a call connection and a call check for each generation in the present invention, with reference to this description will be described an embodiment of the call monitoring in the line monitoring unit 18.

As shown in FIG. 3, the present invention uses the shift register 32 for call monitoring of the generation telephone 50. As shown in FIG. The shift register 32 shifts and applies a predetermined signal to the plurality of generation telephones 50. In the example shown, high-level signals which are shifted and output from the Q0, Q2, Q4 and Q6 terminals of the shift register 32 are transmitted to the four generation telephones 50, respectively.

Assume that the household phone 1 is called from the lobby phone 10. With respect to the generation telephone 1, a high level signal is transmitted from the Q0 terminal of the shift register 32, and this signal is transmitted to the generation telephone 1 through the diode D1 for preventing the reverse flow of the signal. If the household telephone 1 is busy, a high level is output through the INUSE line in the photocoupler P1-A of the line monitoring unit 18. In this case, the transfer control unit 28 informs the lobby phone 10 that the household phone 1 is in a call.

If the generation telephone 1 is in the standby state, a low level is output through the INUSE line. At this time, the switching control unit 28 outputs a high level to the CONTACT line. Accordingly, while the current flows through the base of the transistor Q1, Q1 is turned on, and the comm pin of the 2803 IC connected to the rear end of the backflow prevention diode D1 is connected to ground to operate the switching relay 16 connected to the generation telephone 1. .

Here, if the household phone 50 is in communication with the lobby phone 10, it is necessary to notify the CO line 40 when a call is generated from the CO line 40. To this end, the present invention further includes a hold circuit unit 34 connected to the trunk line 40. As shown, the hold circuit unit 34 is switched when the high level is applied through the CONTACT line to hold the trunk line 40, thereby making the trunk line 40 in a call state.

The present invention has the basic configuration as described above. By the way, in some key buildings do not establish the intercom line in the guard room phone 60 installed in the guard room, and using the CO line 40 between the guard room phone 60 and the household phone 50, and pays the call fee There is a case.

The present invention provides an embodiment to achieve the interphone line construction effect for the guard room phone 60, when installing the lobby phone 10 in the base building as described above.

1 and 2, the guard room telephone 60 is connected to the guard room connection 24, the line monitoring unit 26, DTMF Receiver 23 for generating a call signal of the guard room phone 60 It is provided.

The guard room connection part 24 switches the connection of the guard room phone 60, and applies a bias current to the guard room phone 60 side. As shown, a bias current of 24V is connected to the guard room 60 through the RB3 resistor.

Guard room telephone 60 receives the ring back tone and dial tone generated in the tone generator 20 through the transformer T1. When the specific household phone 50 is called from the guard room telephone 60, the DTMF receiver 23 receives a key input and passes it to the transfer control unit 28.

As in the lobby phone 10, the switching control unit 28 operates the switching control unit 16, wherein the bias current flows in the order of the resistance RB2-generation telephone-guard office telephone-T1, so that the guard room telephone 60 and the household The telephone 50 is directly connected and in a call state. If the line is in use, the busy tone generated by the busy tone generator 22 cannot receive the call.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a block diagram schematically showing a lobby phone switching apparatus according to the present invention

FIG. 2 is a circuit diagram illustrating a circuit configuration of the switching device in FIG. 1.

3 is a circuit diagram illustrating a generation-specific call connection and call check in the present invention

<Explanation of symbols for the main parts of the drawings>

10: lobby phone 11: switching device

12: lobby phone connection unit 14: call signal generating unit

16: relay relay 18: line monitoring unit

20: tone generator 22: busy tone generator

23: DTMF Receiver 24: Guard room connection

26: line monitoring unit 28: switching control unit

30: power supply section 32: shift register

34: hold circuit part 40: trunk line

50: household telephone 60: security office telephone

Claims (5)

In the lobby phone switching device is installed between the lobby phone 10 is installed in the door of the apartment house and the household telephone (50) installed for each household, to switch the connection between the lobby phone 10 and the household telephone (50) , A lobby phone connection unit (12) for applying a bias current to the lobby phone (10) and the generation telephone (50), and switching the connection of the lobby phone (10); A call signal generator 14 for generating a call signal of the lobby phone 10; A switching relay 16 for switching the generation telephone 50 from the connection with the trunk line 40 to the lobby phone 10; A line monitoring unit 18 for monitoring whether a call between the household telephone 50 and the trunk line 40 is made; A tone generator 20 for generating ring back tones and dial tones; A switching control unit 28 for controlling the operation of the switching relay 16 to call the generation telephone 50 corresponding to the calling signal when the calling signal of the lobby phone 10 is generated; Guard room telephone 60 is installed in the guard room of the apartment house; A guard room connection part 24 for applying a bias current to the guard room phone 60 side and switching the connection of the guard room phone 60; And DTMF Receiver (23) for generating a call signal of the guard phone 60 is further included; The transfer relay 16 operates to switch the household telephone 50 from the connection with the trunk line 40 to the guard room telephone 60 side, and the transfer control unit 28 generates a call signal of the guard room telephone 60. If so, to control the operation of the switching relay (16) to call the generation telephone (50) corresponding to the call signal. The method of claim 1, Lobby phone switching device characterized in that it further comprises a hold circuit unit 34 to hold the trunk line (40) during the call between the lobby phone (10) and the household phone (50) to make a call state. The method of claim 1, And a shift register 32 for shifting and applying a predetermined signal to the line monitoring unit 18 of each of the household telephones 50 to detect a call state of the household telephones 50. . delete The method of claim 1, Lobby phone switching device characterized in that it further comprises a line monitoring unit for monitoring the call of the guard room telephone (60).

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