JPS6139797B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that when a master station and a terminal station are in a conversation state due to a call originating from one terminal station among a plurality of terminal stations, a call is made from the master station, which is the called party, to the other terminal station. Alternatively, the present invention relates to a communication path selection control device capable of selectively switching a communication path to a slave station.

Conventionally, it has been possible to communicate between multiple terminal stations and a single slave station via a private line, and between a slave station and a master station via a subscriber line. Also known is a communication path connection method in which an auto-dial device installed in the slave station is used to call the master station from the terminal station via the slave station, thereby making it possible to communicate between the terminal station and the master station. .

However, in such a communication path connection system, (a) the terminal station can call the master station using an auto-dial device, but the master station can only call the slave station, but cannot directly call the terminal station; I can't.

(b) When a subscriber line between a slave station and a master station is captured by an auto-dial device and a conversation is established between one terminal station and the master station, the terminal station restores the communication device and releases the subscriber line. No other terminal station can call the master station until the call is made. This causes inconvenience when it is necessary to communicate with a large number of terminal stations urgently. There were drawbacks such as:

The present invention corrects the above-mentioned drawbacks, and when a subscriber's line is captured by a call from one terminal station and the terminal station and the master station are in a conversation state, the captured state of the subscriber's line is determined. It is an object of the present invention to provide a communication path selection control device that can switch the communication path connection from a master station, which is a called party, to another terminal station or a slave station while maintaining the connection.

The present invention will be explained below with reference to embodiments shown in the drawings.

In FIG. 1, 10 is a terminal station, and 11 is a terminal station 10.
21 is a communication device for emergency communication of the slave station; 22 is a subscriber telephone of the slave station; 2
4 is the subscriber telephone of the master station, 26 is the subscriber line, 2
7 is the switchboard of the Telecommunications Corporation. Slave station communication device 2
1 and the communication device 11 of the terminal station 10 are connected by a private line 28 via a connection device 30, and the connection device 30 is connected to the subscriber line 26 via a converter 23. Further, on the master station side, there is a connection control device 50 that sends a switching signal for switching the communication path connection or a recovery signal for opening the communication path to either the communication devices 21 of the plurality of slave stations or the communication device 11 in the terminal station 10. It is connected to a subscriber line 26 via a converter 25.

FIG. 2 is a diagram showing an example of the configuration of the terminal station 10 and the connection device 30. Each of the plurality of terminal stations 10 includes a communication device 11 consisting of the above-mentioned activation switch, microphone, and speaker, a buzzer 12 that operates when the connection is switched in response to a communication path connection switching signal from the master station side, and a slave station. An incoming call display unit 13 is installed to display when a call is being received on the subscriber line 26 on the station side. Reference numeral 29 denotes a buzzer that operates when a call is received from the communication device 11 of the terminal station 10 or from the master station to the communication device 21 of the slave station.

Reference numeral 31 connects the communication device 11 of the terminal station 10, the communication device 21 of the slave station, and the subscriber telephone 24 of the master station so as to enable communication, and allows communication between the plurality of communication devices of the terminal station 10 or the slave station by the switching signal. These are a local line section and a line switching section that switch the communication path connection between one of the devices 21 and the master station side. This premises line section and line switching section 31 are connected to a plurality of terminal stations 10.
When calls are received from two telephone devices 11 in parallel, the first-come-first-served basis is configured, and the telephone device 11 of one terminal station 10 connected to the telephone call and the telephone telephone device 21 of a slave station or During a conversation with the subscriber telephone set 24 of the master station, the conversation can be heard through the speakers of the communication devices 11 of the terminal stations 10 other than the first-arrived station.

32 is a presence/absence switch installed in the slave station; 3
3 is the telephone device 2 of the slave station from the telephone device 11 of the terminal station 10
A timer 34 operates after a predetermined period of time has elapsed after the start of a call to the terminal station 1 while the communication device 11 side of the terminal station 10 is calling the communication device 21 of the slave station.
This is a ringing notification unit for sending a ringing tone to the speaker of the communication device 11 in 0. 335 is an absentee tone or an absentee announcement ( (by the auto-announcer) is sent to the speaker of the communication device 11 of the terminal station 10, and when there is a response to the subscriber telephone 24 of the base station by the auto-dial section 36 (to be described later), the communication between the terminal station 10 and the base station side is transmitted. This is a notification unit that sends an announcement (by an auto-announcer) of the name of the building where the terminal station 10 is located to the subscriber telephone of the master station before conversation. 36 is a predetermined period of time when a call is made from the communication device 11 in the terminal station 10 to the communication device 21 of the slave station, even if the presence-absence switch 32 is on the "absent" side or even if it is on the "present" side. An auto-dial unit (automatic calling device) that sends a dial pulse for a pre-stored specific subscriber (master station) number to the exchange 27 when there is no response; the line control unit 37;
It is composed of a control section 38 and a dial memory 39.

This control unit 38 includes a call collision prevention circuit that detects an incoming call on the slave station side of the subscriber line 26 and suspends activation of auto-dial, and a call collision prevention circuit that detects an incoming call on the slave station side of the subscriber line 26 and suspends activation of auto-dial. 26 detects a response and outputs a detection signal, and operates if this detection signal is not output for a predetermined period of time after auto-dial activation, and outputs a detection signal to the subscriber telephone 24 of the terminal station 10. It includes a timer to cancel the call. Furthermore, the ringing tone and busy tone of the public corporation when calling by auto dialing are heard by the speaker of the communication device 11 in the terminal station 10 via the line control section 37 and the premises line section 31. In order to be distinguishable from the telephone corporation's ring tone and busy tone to the subscriber telephone 24 of the parent station, the telephone corporation's ring tone and busy tone are the telephone corporation's ring tone, It consists of an oscillating sound with a different frequency from the busy sound.

40 receives a switching signal or a restoration signal from the connection control device 50 of the master station, and causes the line switching unit 31 to connect the subscriber telephone 24 of the master station to the communication device 21 of the slave station or the terminal station 10. Telephone device 11
This is a receiving unit that sends out a switching command to switch to either one or a restoration command to open the communication path. 41 is a transmitter that receives a switching completion signal from the line switching unit 31 and sends the switching completion signal to the connection control device 50. 42 is a power supply that supplies AC100V, and 43 is a battery for power outage time.

Figure 3 shows a connection control device 50 installed on the master station side.
2 is a diagram illustrating an example of the configuration in which a subscriber telephone 24 of a master station is connected via a converter 25 to a subscriber line 26 to which it is connected.

In the figure, A is a hook-up detection relay that operates when the subscriber telephone 24 lifts the hook, a is its normally open contact, and B is a transmission of a switching signal and a recovery signal from a transmission section of a connection control device 50, which will be described later. b is its contact, c1 is a capacitor for bypassing the audio signal, c2 and c3 are DC blocking capacitors, RET is the switching signal, restoration signal, A blocking wire 51 is an AC coupling transformer for forming a DC loop during transmission and reception of a completion signal, etc.

Reference numeral 52 includes a changeover switch for switching the communication path connection of the subscriber telephone 24 to either the communication device 21 of the slave station or the communication devices 11 in the plurality of terminal stations 10, and a recovery button for opening the communication path. An operating section 53 is a transmitting section 54 that sends out a switching signal or a recovery signal in accordance with the operation of the operating section 52.
receives the completion signal from the transmitter 41 in the connection device 30, confirms that the number of the connected terminal station 10 or the signal representing the slave station matches the number operated by the changeover switch, and sends the signal. Department, 55
is a display unit that displays the number or slave station of the terminal station 10 that has been switched and connected in response to the signal from the receiving unit 54;
56 is a control section that controls the transmitting section 53 and the receiving section 54. 57 is a power supply that supplies AC100V, and 58 is a battery for use during a power outage.

Next, a concrete example of the operation of the above device will be explained with reference to FIGS. 2 and 3.

(1) Turn on the activation switch of the communication device 11 of the terminal station 10.
When turned ON, the buzzer of the communication device 21 will sound if the presence/absence switch of the slave station is set to the "present" side. During this ringing, the ringing tone from the ringing notification section 34 is heard by the speaker of the communication device in the terminal station 10. Slave station communication device 21
When the terminal station 10 responds, communication becomes possible between the terminal station 10 and the slave station. Note that when a plurality of terminal stations 10 call a slave station in parallel, only the terminal station 10 that arrives first is connected. However, the speaker of the communication device 11 of the other terminal station 10 that has performed the calling operation can hear the conversation between the terminal station 10 and the slave station.

(2) Even if the presence/absence switch of the slave station is set to the "present" side, if there is no response for a predetermined period of time (timer 33 operates), the presence/absence switch 32 is set to the "absent" side. If so, the absence sound or absence announcement from the notification section 35 is heard by the speaker of the communication device 11 in the terminal station 10.

(3) At this time, the control unit 38 receives the start signal from the timer 33 or the absence signal from the presence/absence switch 32, and the auto dial unit 36 captures the subscriber line 26 and stores it in the dial memory 39. A dial pulse is sent out, and the exchange 27 sends out a calling signal to the subscriber telephone 24 of the master station. Note that if the subscriber line 26 on the slave station side is receiving a call, the call collision prevention circuit in the control section 38 operates and the auto dial section 36 is not activated. (At this time, the incoming call display section 13 in the terminal station 10 displays the fact that the call is being received.) Also, the ringing tone or busy tone of the telephone corporation to the subscriber telephone 24 is transmitted to the line control section 37, the premises line section 31 is heard by the speaker in the terminal station 10 via the terminal station 10.

If there is no response from the subscriber telephone 24 for a predetermined period of time, a timer in the control unit 38 operates to cancel the call.

(4) When the subscriber telephone 24 responds, a detection signal from the other party's response detection circuit in the control unit 38 is output to the notification unit 35 due to polarity reversal of the subscriber line, and therefore the notification unit 35 operates and the terminal station Before the communication between the terminal station 10 and the master station, an announcement of the location of the terminal station 10, etc. is sent from the notification section 35 to the subscriber telephone 24, and after that, communication with the terminal station 10 becomes possible. As described above, the conversation at this time can be heard through the speaker in the terminal station 10 that arrived after the calling operation.

(5) On the master station side, for example, if it is thought that an accident has occurred simultaneously in a plurality of terminal stations 10, the operator operates the changeover switch of the operation section 52 in the connection control device 50 to send a changeover signal. When the hook of the subscriber telephone 24 is lifted, contact a is closed, and the operation section 52 is closed.
Since relay B is activated by the operation of , contact b is switched from the subscriber telephone 24 side to the connection control device 50 (see Fig. 3), and the switching signal from the transmitter 53 is transferred to the coupling transformer 51 and the capacitor c.
2, c3 is received by the receiving unit 40 of the connecting device 30, and the line switching unit 31 connects the subscriber telephone 24 to one of the terminal stations 10 or slave station communication device 11 given by the switching command. Switched to 21. When the switching is completed, the transmitter 41
The completion signal from the receiving unit 5 of the connection control device 50
4 (while receiving this completion signal, relay B
is activated and the contact b is on the connection control device 50 side), and the number of the terminal station 10 or the number of the slave station that has been switched and connected is displayed on the display section 55.
Buzzers 12 and 29 sound in the switched terminal station 10 or slave station. Since the contact point a remains in the original state shown in FIG. 3 except when an operation signal is being transmitted from the operation section 52 or a signal is being received from the connection device 30, the subscriber telephone 24 can be connected to either the desired communication device 11 or 21. You will be able to connect and talk.

(6) If the communication devices 11 and 21 remain disconnected in the terminal station 10 or the slave station after the conversation ends, the transmitter 53 operates the recovery switch on the operation unit 52 at the master station and sends a recovery signal. do. Receiving section 40 receives this and opens and restores the communication path between either telephone device 11 or 21 and subscriber telephone 24.

It goes without saying that the subscriber telephone 22 of the slave station may be used in place of the communication device 21 in the above embodiment.

As explained above, the present invention is capable of switching the connection to any communication device in the terminal station 10 or the communication device of the slave station by providing a connection control section on the master station side and sending a switching signal. This has the advantage that appropriate processing can be performed for multiple terminal stations or slave stations.

[Brief explanation of the drawing]

The drawings show an embodiment of the communication path selection control device of the present invention. FIG. 1 shows an outline of the overall configuration, FIG. 2 shows the configuration of the connection device, and FIG. 3 shows the configuration of the connection control device. Show the configuration. DESCRIPTION OF SYMBOLS 10...Terminal office, 11...Telephone device, 21...Telephone device, 22...Subscriber telephone, 26...Subscriber line, 28...Private line, 30...Connection device, 3
1...Premises line section and line switching section, 36...
...Auto dial section, 40... Receiving section, 41...
Transmitting unit, 50...Connection control device, 52...Operation unit, 53...Transmitting unit, 54...Receiving unit, 55...
Display section.

Claims (1)

[Claims] 1. Each of a plurality of terminal stations is provided with a communication device, the output signal of the communication device is received by the slave station, and the automatic calling device of the slave station is driven by this output signal or the output signal of the communication device of the slave station. , captures the subscriber line to enable communication between the subscriber telephone of the master station and the communication device of the terminal station or slave station, and while holding the subscriber line capture device, the connection control unit of the master station; By transmitting a switching signal from the base station to the subscriber line and receiving this switching signal at the connection device of the slave station, the communication path connection with the subscriber telephone of the master station is selectively switched to one of the communication devices. A communication path selection control device characterized by: