JP2538919B2 - Button telephone device switching device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a data communication / call switching system in a key telephone device.

(Prior Art) Currently, when data communication is performed in a key telephone device, in an analog key telephone device, since communication data transmitted and received is an analog voice signal, the handset of the key telephone is connected to an acoustic coupler, etc. , Analog / digital conversion is required.

FIG. 2 is a connection system diagram of a conventional analog button telephone device. In the figure, A is a main device, B1 and B2 are button telephones, C1 and C2 are acoustic couplers, and D1 and D2 are interfaces RS.
A data terminal device connected via −232C. Connect the handset (not shown) of the button telephones B1, B2 to the acoustic coupler C1,
In the case of connecting to C2, when the lines of the key telephones B1 and B2 are connected, the answer tone (response) from the partner data terminal device D1 or D2 is confirmed, and the connection is artificially made.

On the other hand, in the recently developed digital button telephone device, since the voice signal is a digital signal, there is no need for analog / digital conversion, and data communication is performed by directly connecting the data terminal device to the button telephone device. Done.

FIG. 3 is a connection system diagram of a conventional digital button telephone device. In FIG. 3, E is a main device, F1 and F2 are data communication and call switching devices, and G1 and G2 are button telephones.
In this case, the data terminal device D1, D directly to the key telephone device
Since 2 is connected, switching control between data communication and telephone call is required in the key telephones G1 and G2. This is an operation of switching a digital voice signal to a call circuit as voice during a call and switching to a terminal side circuit as communication data during a data communication.

(Problems to be Solved by the Invention) However, since the above-mentioned telephone control system of the key telephone device is the periodic control for each system of each key telephone by the star connection, it is necessary to change each of the data communication and the call. There is a time lag between the systems, and it is impossible to switch at the same time. Therefore, for example, at the time when the switching device F1 switches the data terminal device D1 side circuit, the switching device F2 is still on the button telephone G2 circuit side, and the voice of the button telephone G2 communicates due to the deviation of this state. There is a problem in that it enters the data terminal device D1 as data and mixes in as interfering data.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned problem that interfering data is mixed and to provide a communication system and a communication system of a key telephone device that enables high quality data communication and communication. .

(Means for Solving the Problems) In order to solve the above problems, the present invention connects a main unit of a key telephone device to enable mutual communication between key telephone devices and communication between data terminal devices. In a switching device of a button telephone device for switching connection to a terminal device, a terminal side circuit connected to a data terminal device, a call circuit connected to a key telephone, and a main device are connected to the terminal side circuit or the call circuit. A first switch for switching to the terminal circuit or the call circuit, and the first switch
And a second switch for turning on / off a connection between the switch and the data terminal device or the key telephone, and the second switch, when the main device sends a switching request to the switching device, A switching device for a button telephone device, wherein the first switch is turned off before switching between the terminal side circuit and the communication circuit, and is turned on after switching of the first switch is completed.

(Operation) According to the present invention, when switching between communication and call,
When the main device sends a switching request to the switching device, first the second
Is turned off, and then the connection by the first switch becomes the data terminal device side (or the button telephone side), the button telephone (or the data terminal device) is opened, and the data terminal device and the key telephone are common. By interposing the preamble state, the above operation of the second switch and the first switch is confirmed for the other party of communication or call, and at this time, the connection by the first switch is made on the data terminal device side (or on the button telephone side). ), And
Further, the data terminal device connected to the second switch is opened, and finally the second switch is turned on to establish a circuit for designating switching between mutual communication and communication.

(Embodiment) FIG. 1 is a circuit diagram of a data communication / call switching device showing an embodiment of the present invention.

In the figure, H1 and H2 are switching devices having the same specifications, and are provided in place of the switching devices F1 and F2 of the system of FIG.

SW1 is the first switch, which connects the main device E to the data terminal device D
Switch between the 1 or D2 side and the key telephone G1 or G2 side.

SW2 is a second switch provided in the circuit T on the terminal side.
The switch SW1 and the data terminal device D1 or D2 are turned on / off, and may be provided in the communication circuit S.

FIG. 4 is a diagram showing a sequence of switching between data communication and a call by the system of the present invention in which the system of FIG. 3 is equipped with the switching device of FIG.

First, when there is a communication start request from the switching device H1 when shifting from the call state between the key telephones G1 and G2 to the data communication state, the main device E sends a communication start preparation request to each switching device H1 and H2. To do. In response to this request, the switching devices H1 and H2 respectively turn off the switches SW2 of the terminal side circuits T1 and T2 (Fig. 4), and then switch SW1 to the terminal side circuits T1 and T2 side (Fig. 4). Of), put in the preamble state.
The operation of each of the switches SW2 and SW1 has a time lag between the switching devices H1 and H2 as described above, but it is possible to switch the switch SW1 by turning off the switch SW2 first.
The interfering data (other party's voice) generated by the switching of is switched off.

After that, the switching devices H1 and H2 determine whether the data terminal devices D1 and D2 are in the communicable state by the data terminal ready signal (ER signal) of the interface RS-232C, and if the ER signal is on, the main device E To the communication start preparation completion. The main device E sends a communication start command when the responses from the switching devices H1 and H2 are complete. Therefore, at the time of this transmission, in both of the switching devices H1 and H2, the switch SW1 is on the side of the terminal side circuits T1 and T2, and the states are the same. Then, by this communication start command, the switching devices H1, H
The switch 2 turns on the switch SW2 (release of preamble state in FIG. 4) and turns on the data set ready signal (DR signal) of the interface RS-232C for the data terminal devices D1 and D2 to enter the communication state.

Next, when shifting from the data communication state to the call state, first, in response to the communication end request from the switching device H1, the main device E sends a communication end preparation request to each of the switching devices H1 and H2. In response to this request, the switching devices H1 and H2 respectively turn off the switch SW2 (see FIG. 4) and put it in the preamble state. After that, the main device E replies that the communication end preparation is completed, and the main device E sends a communication end command when the replies from the respective switching devices H1 and H2 are complete.

By this communication end command, each switching device H1, H2 turns off the DR signal of the interface RS-232C, and then switches
SW1 is switched to the communication circuits S1 and S2 side (FIG. 4), and then switch SW2 is turned on (preamble state cancellation in FIG. 4) to return to the communication state.

The switching by the digital button telephone device when the first switching device is used in the system of FIG. 3 has been described above, but in the case of switching by the analog button telephone device, each of the button telephones B1, in the system of FIG. First on B2
The functions of the switching devices H1 and H2 shown in the figure are provided, and the handset of the button telephones B1 and B2 is provided in place of the button telephones B1 and B2 of FIG. 2, and a modem is provided instead of the acoustic couplers C1 and C2 of FIG. Similar switching is possible by using. In this case, in the circuit of FIG. 1, the modem is provided in the terminal side circuits T1, T2 or between the terminal side circuits T1, T2 and the data terminal devices D1, D2.

(Effect of the Invention) As described above, according to the present invention, when switching between communication and call, the preamble state by the open state is mutually confirmed before the mutual connection by the switching designation, and then the designated switching is performed. Therefore, the effect that the voice on the button telephone side will not be mixed into the data terminal device as disturbing data in the transition process of switching can be expected.

[Brief description of drawings]

1 is a circuit diagram of a data communication / call switching device showing an embodiment of the present invention, FIG. 2 is a connection system diagram of a conventional analog button telephone device, and FIG. 3 is a connection of a conventional digital button telephone device. A system diagram, FIG. 4 is a diagram showing a sequence of switching between data communication and a call showing an embodiment of the present invention. A, E …… Main device B1, B2, G1, G2 …… Button telephone D1, D2 …… Data terminal device H1, H2 …… Switching device SW1 …… First switch SW2 …… Second switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shisei Masuhara 4-11-22 Shibaura, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. Annex 1, Oki Communication System Co., Ltd.

Claims (1)

(57) [Claims] 1. A switching device for a button telephone device, which is connected to a main device of a button telephone device to switch connection between a telephone call between button telephones and a communication between data terminal devices. A connected terminal circuit, a call circuit connected to a key telephone, a first switch for switching the connection of the main device to the terminal circuit or the call circuit, and the terminal circuit or the call circuit A second switch that is provided and that turns on and off the connection between the first switch and the data terminal device or the key telephone; and the second switch, in which the main device is the switching device. When the switching request is sent, the first switch is turned off before the switching between the terminal side circuit and the communication circuit, and the first switch is switched. Switching device key telephone system characterized by comprising an on after completing.