JPS63174463A - Facsimile connection device for key telephone system - Google Patents

Abstract

PURPOSE:To easily connect a facsimile equipment based on a request from a user, by providing a facsimile connection device between a terminal interface circuit for connecting a key telephone set in a key telephone main device and the facsimile equipment. CONSTITUTION:An incoming response transmission control means A, when an incoming being inputted to the facsimile equipment 50 and a DC loop being closed by the equipment 50, detects the fact, and transfers it to a central control circuit 70 in a main device 100. Also, an outgoing information transmission control means B detects the outgoing and the dial signal of the equipment 50, and transfers the fact of the outgoing and a bit of dial information to the control circuit 70. Furthermore, a ring-off information transfer control means C, when the equipment clearing a call and the DC loop being released, detects the fact, and transfers it to the control circuit 70, and also, when an opposite device rings off and the information of the fact is sent from the control circuit 70, the polarity of the DC loop of the equipment 50 is inverted, and the ring-off is transferred to the equipment 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a facsimile connection device for a button telephone device, which is used to connect a facsimile device to a button telephone device.

(Prior Art) In recent years, electronic key telephone devices have come into widespread use in offices and the like, and this type of device has conventionally been configured as follows, for example. FIG. 3 shows its block configuration, and this device has central office line interface circuits (COU
) 21 to 2n and multiple key telephones (EKT) 31
Terminal interface circuits (STU) 41 to 4m installed every 3m and facsimile machine (FAX)
50 and a loss point switch circuit (CP) 60, each of which is controlled by a central control circuit (CCU) 70. . Note that 80 is a tone signal generating unit (INU) that generates various tone signals such as a dial tone, and 90 is a power supply unit. If such a device is used, the key telephones 31-
Between 3m and each button telephone 31 to 3m and central office line 11
It goes without saying that it is possible to make calls with the other party's telephone connected via the facsimile device 50.
facsimile communication can be carried out between the facsimile machine and the other party's facsimile machine connected via the central office lines 11 to 1n, which is extremely convenient.

However, such a conventional button telephone device is provided with a facsimile terminal interface circuit 51 to enable connection of the facsimile device 50, and this facsimile terminal interface circuit not only provides an audio signal circuit but also a facsimile device 50. Necessary for connecting the facsimile machine, such as a power supply circuit that supplies line voltage (48V) and DC loop current, a ringing signal generation circuit that supplies a 16H2 ringing signal, and a circuit that detects an incoming call response and transmits it to the central control circuit 70. Since the telephone is equipped with various circuits, the configuration is complicated, and as a result, there is a problem in that the device is inevitably more complicated and larger than a normal key telephone device that is only capable of making calls. Moreover, this facsimile terminal interface circuit 51 is generally made into a circuit board and fixedly housed in the device housing when the button telephone device is manufactured, so it becomes an excessive equipment and expensive for users who do not use the facsimile device. Become. On the other hand, when adding a facsimile machine, it is not easy to do so because the terminal interface circuit for the button telephone must be disabled and a new facsimile terminal interface circuit must be installed in its place. Furthermore, in order to solve this problem, it may be possible to provide multiple facsimile terminal interface circuits in advance, but if this is done, the circuits will be wasted if only one or a small number of facsimile machines are used. I don't like it.

(Problems to be Solved by the Invention) As described above, the conventional button telephone device lacks flexibility in connection with facsimile devices, so it cannot respond appropriately to user requests, and the device configuration is complicated. However, the present invention has focused on this point and has simplified the configuration of the button telephone device by eliminating the circuit for connecting the facsimile device from the button telephone device, while meeting the user's requirements. It is an object of the present invention to provide a facsimile connection device for a button telephone device that can increase flexibility by allowing the facsimile device to be used appropriately and easily as required.

[Structure of the Invention] (Means for Solving the Problems) As shown in FIG. supplies the calling signal that has arrived via the button telephone main device to the facsimile device, detects when the facsimile device responds to the incoming call, and transmits this to the key telephone main device to control the connection. an incoming call response transmitting means A that transmits a call from a facsimile device, a calling information transmitting means B that transmits dial information to the key telephone main device when the facsimile device makes a call, and a call information transmitting means B that transmits the fact that the facsimile device has made a call and dial information to the key telephone main device; Call end information transmitting means C which inverts the polarity of the DC loop of the device to end the call on the facsimile machine, detects when the facsimile machine has ended the call, and transmits this to the key telephone main device to release the DC loop of the central office line. A facsimile connection device for a button telephone device is provided.

(Function) As a result, when connecting a facsimile device, it is only necessary to connect it to the button telephone terminal interface circuit of the button telephone main device, so it is not necessary to provide a facsimile terminal interface circuit in the button telephone main device. As a result, the structure of the key telephone device can be made simple and compact. In addition, since you only need to prepare facsimile connection devices depending on whether or not facsimile devices are used and the number of facsimile devices in use, you can extremely easily respond to user requests and configure a highly flexible system. can.

(Embodiment) FIG. 2 shows the configuration of a facsimile connection device for a button telephone device in an embodiment of the present invention, where 200 is a facsimile connection device for a button telephone device, 100.50 is a button telephone main device, and 100.50 is a key telephone main device and A facsimile machine is shown.

A facsimile connection device for a button telephone device (hereinafter referred to as a connection device) 200 is connected via a connection cable 300 between the terminal interface circuit 41 of the key telephone main device 100 and the facsimile device 5o. Note that this connection is made, for example, by a connector. Connection device 200
is a signal transmission line connecting the voice transformer of the terminal interface circuit 41 and the facsimile machine 50, and the data transformer of the terminal interface circuit 41! II
@ has a data transmission path connecting with the circuit 207,
The signal transmission path is provided with signal transformers 201 and 204 and a loop current detection circuit 205. Among these, the loop current detection circuit 205 detects whether or not a DC loop is formed in the facsimile machine 50, and supplies a detection output to the control circuit 207. On the other hand, a data transformer 202 is provided on the data transmission path. This data transformer 202, together with the signal transformer 201 of the signal transmission path, extracts the power output supplied from the power supply section 90 of the button telephone main device 100 and introduces it into the power supply circuit 203. From this power output, the control circuit 207
Generates the operating voltage of The connection device 200 also has a polarity inversion circuit 206, which inverts the polarity of the DC loop of the facsimile machine H50.

By the way, the control circuit 207 is equipped with, for example, a microcomputer as a main control section, and has an incoming call response transmission control means, a calling information transmission control means, and a call termination information transmission control means. First of all, the incoming call response transmission control means is
When the facsimile machine 50 receives an incoming call and the facsimile machine closes the DC loop, this is detected from the detection output of the loop current detection circuit 205, and this fact is sent to the central control of the button telephone main unit 100 via the data transmission path. to the circuit 70. Further, the call information transmission control means detects the call and dial signals from the facsimile device 50 from the detection output of the loop current detection circuit 205, and notifies the central control circuit 70 of the button telephone main device 100 of the fact that the call has been made and the dial information. Further, the end-of-call information transmission control means detects when the facsimile machine 50 releases the end-of-call DC loop from the detection output of the loop current detection circuit 205 and notifies the central control circuit 7 of the button telephone main device 100 to that effect.
At the same time, when the other party connected via the central office line 11 has terminated the call and information to that effect is sent from the central control circuit 70, the polarity reversal circuit 206 changes the polarity of the DC loop of the facsimile machine [50]. Then, the end of the message is transmitted to the facsimile machine 50.

With this configuration, it operates as follows.

■ When an incoming call occurs When a 1300 Hz ringing signal arrives from the office line 11, this ringing signal is introduced into the terminal interface circuit 41 via the office line interface circuit 21 of the key telephone main unit 100 and the crosspoint switch 60, and this terminal The interface circuit 41 superimposes it on the power output from the N deep part 90 and sends it to the connection device 200. The signal is then directly transmitted to the facsimile machine 50 via the signal transformers 201 and 204 of the connection device 200. Now, when the facsimile machine 50 responds to this and closes the DC loop, this is detected by the loop current detection circuit 205 and sent to the control circuit 207, and the control circuit 207 sends a signal to that effect through the data transmission path. It is transmitted to the control circuit 70. Then, the central control circuit 70 causes the office line interface circuit 21 to establish a DC loop for the office line 11, performs a predetermined incoming/outgoing judgment in this state, confirms that the call is incoming, and then maintains the DC loop as it is. Thus, the communication path between the office line 11 and the facsimile machine 50 is connected, and facsimile communication is then possible between the sending device and the facsimile machine 50 connected via the office line 11. The above call determination is based on the detection of the polarity reversal detection circuit 21a of the office line interface circuit 21 to determine whether or not the polarity is reversed within a certain period of time (several meters to several hundred meters5ec) after the DC loop of the office line 11 is opened. This is done by determining from the output. That is, in the case of an incoming call response, the polarity of the office line 11 is reversed within the above-mentioned fixed time, but in the case of an outgoing call, it is not reversed.
This is used to determine incoming and outgoing calls.

■ In the case of a call When the facsimile machine 50 closes the DC loop in an attempt to make a call, this is detected by the loop current detection circuit 205 and sent to the control circuit 207.
7 transmits information to that effect to the central control circuit 70 via the data transmission path. Then, the central control circuit 70 causes the office line interface circuit 21 to temporarily close the DC loop of the office line, and in this state performs the above-mentioned incoming/outgoing call determination, and when it confirms that the call is an outgoing call, it first closes the DC loop. Then, the tone signal generating circuit 80 is connected to the terminal interface circuit 41 by the cross point switch 60. Then, the dial tone generated by the tone signal generation circuit 80 is supplied to the facsimile machine 50 via the signal transmission path of the connection device 200. On the other hand, when facsimile machine 50 generates a dial signal consisting of dial pulses, this signal is detected by loop current detection circuit 205 and sent to control circuit 207, and from this control circuit 207 to central control circuit 70. Then, the central control circuit 70 selects the office line specified by the first three digits of the dial signal, checks its availability, and then uses the crosspoint switch 60 to select the terminal interface circuit to which this office line and the facsimile machine 50 are connected. 41. Then, the dial signal generation circuit of the office line interface circuit 21 is driven in accordance with the numbers starting from the fourth digit of the dial signal to send a dial signal to the office line 11.

A call to the other party is then made. If the other party's device responds to this call, facsimile communication between this device and the facsimile device 50 becomes possible from then on.

■ In the case of call termination If facsimile communication is terminated and, for example, the other party's device connected via the central office line terminates the call first, in this case, polarity reversal occurs on the central office line and this is reflected in the central office line terminal interface circuit 21. It is detected by the polarity reversal detection circuit 21a and the fact is transmitted to the central control circuit 70, and from this central control circuit 70 the control circuit 20 of the connection device 200 is transmitted via the data transmission path.
7. Then, the control circuit 207 inverts the polarity of the DC loop of the facsimile machine 50 using the polarity inversion circuit 206. As a result, the facsimile machine 50
This polarity reversal confirms the end of the call and returns to the standby state.

On the other hand, if the facsimile machine 50 ends the call first, this is detected by the loop current detection circuit 205 of the connection device 200 and sent to the control circuit 207, and this fact is transmitted from the control circuit 207 to the central control circuit 70. Ru. As a result,
In accordance with instructions from the central control circuit 70, the direct current loop of the central office line 11 is released by the central office line interface circuit 21, thereby notifying the exchange that the call has ended.

In this embodiment, the button telephone main device 100
The facsimile device 50 is connected to the terminal interface circuit 41 of the
By connecting this, it is possible to connect a facsimile device using the terminal interface circuit for a button telephone as is, without providing a terminal interface circuit for facsimile connection in the key telephone main device.

Therefore, the configuration of the button telephone device can be made extremely simple and compact. In addition, facsimile machines can be connected appropriately and extremely easily depending on the user's requirements, such as whether or not facsimile machines are used and the number of facsimile machines used, increasing flexibility in using the button telephone device. .

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the case where a 1300)lx signal is used as a calling signal, that is, the case where a response to a call from a facsimile network is used, was explained, but the 16H2
It may also be possible to support subscriber networks that use paging signals. In this case, this can be easily implemented by providing a 16H7 generation circuit in the connecting device. The configurations of the incoming call response transmitting means, the outgoing call information transmitting means, the call termination information transmitting means, the configuration of the key telephone main unit, etc. can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As detailed above, according to the present invention, a call that comes from a central office line via the button telephone main device is transmitted between the key telephone connection terminal interface circuit of the key telephone main device and the facsimile machine. Incoming call response transmitting means for supplying a signal to the facsimile machine, detecting when the facsimile machine responds to the incoming call, and transmitting the fact to the key telephone main unit to control the connection; and dial information transmitting means for transmitting the fact and dial information to the key telephone main device when the key telephone main device transmits the end of the call on the central office line side. By providing a facsimile connection device for a button telephone device, which is equipped with a call end information transmitting means that allows the facsimile device to speak and detects when the facsimile device has ended the call and transmits this to the key telephone main device to release the direct current loop of the central office line. , it is possible to simplify the configuration of the button telephone device by eliminating the circuit for connecting the facsimile device from the button telephone device, and moreover, the facsimile device can be used accurately and easily according to the user's requirements. It is possible to provide a facsimile connection device for a button telephone device that can increase the flexibility of the telephone device.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram for explaining the present invention in detail, FIG. 2 is a circuit diagram showing the configuration of a facsimile connection device for a button telephone device in an embodiment of the present invention, and FIG. 3 is a conventional button telephone FIG. 2 is a circuit block diagram showing the configuration of the device. A: Incoming call response transmitting means, B: Calling information transmitting means, C: End of call information transmitting means, 11 to 1n: Office line,
21-2n...Station line interface circuit, 21a...
・Polarity reversal detection circuit, 31-3m...button telephone,
41-4m...Terminal interface circuit for button telephone, 50...Facsimile machine, 51...Terminal interface circuit for facsimile, 60...Cross point switch, 70...Central control circuit, 80...・
Tone signal generation circuit, 90...power supply section, 100...
Key telephone main device, 200...Facsimile connection device (connection device) for key telephone device, 201.204...
Signal transformer, 202... Data transformer, 20
3... Power supply circuit, 205... Loop current detection circuit,
206... Polarity inversion circuit, 207... Control circuit. Applicant's agent Patent attorney Takehiko Suzue 171

Claims (1)

[Claims] A button telephone main device is provided between a button telephone connection terminal interface circuit and a facsimile device for selectively connecting the key telephones to each other and between the key telephone and the central office line, and connects the key telephone main device from the central office line to the facsimile machine. incoming call response transmitting means for supplying the incoming call signal to the facsimile device, detecting when the facsimile device responds to the incoming call, and transmitting this to the key telephone main device to control the connection; A calling information transmitting means that transmits dial information to the key telephone main unit when the facsimile machine makes a call, and a means for reversing the polarity of the DC loop of the facsimile machine when the key telephone main unit reports the end of the call on the central office line side. A button telephone device characterized by comprising a call end information transmitting means for causing a facsimile machine to end a call and detecting when the facsimile machine has ended a call and transmitting this to the key telephone main unit to release a direct current loop of a central office line. facsimile connection device.