JPH03259653A - Private branch exchange system - Google Patents

Abstract

PURPOSE:To send a call signal immediately to an extension telephone set in interlocking with the depression of a call signal button by storing a line of a channel switch even when a telephone set is hooked on so as to send call signal information and outputting the call signal to the telephone set hooked on detecting the information. CONSTITUTION:When an extension telephone set 14 is hooked on and restored after the talking between the extension telephone set 14 and an operation board 12, a central processing unit 19 detects it to keep a time division channel switch 11 between the extension telephone set 14 and the operation board 12. When the operator of the operation board 12 depresses a call signal button 23, a call signal button relay 24 is closed and call signal information 27 is outputted together with a control signal from a call signal information provision circuit 26. Upon the detection of the call signal information 27 at a call signal informa tion detection circuit 28, a call signal transmission relay 29 is closed. When the call signal transmission relay 29 is closed, a call signal transmission relay 31 is closed interlockingly and a call signal is outputted to the extension tele phone set 14 hooked on from the call signal source 32.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a private branch exchange system, and for example, a private branch exchange system in which a telephone that has finished a call can be called from an operation console connected to a private branch exchange in a fire department. Regarding.

[Conventional technology]

A private branch exchange (PB) that accommodates multiple telephones via trunks and allows mutual calls to be made independently of the public telephone network.
X) is widely used in companies and government offices. Some private branch exchanges have a console that accepts calls from telephones. In such a private branch exchange, when a connection request is received from a telephone, a line is connected to the console using a communication path switch. The operator at the console connects the line to another telephone, if necessary, or speaks to the person on the other end of the telephone that made the call. When the call ends and the telephone goes on-hook, the call path switch releases the line.

In such a private branch exchange, a request to call an on-hook telephone and talk again may occur on the console side. For example, the operation console of a private branch exchange used in a fire department accepts emergency information such as fire, but even after the telephone has been put on hook, there are cases where it is necessary to immediately call the telephone from the operation console.

In such a case, a call signal button is arranged on the console in order to call the telephone from which the call was made from the console. When an operator wants to call a telephone that has gone on-hook, he or she presses a call signal button located on the console. When the central processing unit controlling the line connection detects that the call signal button is pressed, it searches for a trunk connected to the console and instructs the transmission of the call signal. The trunk receives instructions from the central processing unit and sends a ringing signal to the telephone.

[Problem to be solved by the invention]

In such conventional private branch exchanges, when a call ends and the telephone is placed on hook, the call path switch releases the line. Therefore, when the call signal button is pressed on the console, the central processing unit needs to search for the trunk connected to the console and reconnect the line of the communication path switch.

Therefore, time is required for the central processing unit to detect the depression of the call signal button on the operation console, as well as time for the operation console to search for the trunk where the call was being made.

For this reason, conventional private branch exchanges have a drawback in that they can only send a calling signal to a telephone immediately in conjunction with pressing the calling signal button on the console.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a private branch exchange system that allows telephone calls to be made immediately from an operation console.

[Means to solve the problem]

The private branch exchange system according to claim 1 comprises: (i) an extension telephone; (ii) an operation console that accepts a call request from the extension telephone; and (iii) a trunk switch that connects a line between the operation console and the extension telephone. (iv) a line holding means for holding the line of an extension telephone connected to the operation console even after being on-hook; (v) a disposed call signal button connected to the operation console; (vi) (vii) detecting the calling signal sent from the calling signal sending means; (vii) detecting the calling signal sent from the calling signal sending means; and (vji) a calling means that outputs a calling signal to the extension telephone when the calling signal detecting means detects a calling signal.

That is, the private branch exchange system of the present invention maintains the call path switch even when the telephone is on-hook, sends the ring signal information to the trunk to which the extension telephone is connected via the call path switch, and transmits the ring signal information in the trunk. It detects this and sends a calling signal to the on-hook telephone.

In the private branch exchange system according to the second aspect of the invention, a timer is arranged in the line holding means to hold the line for a predetermined period of time.

In the private branch exchange system according to the third aspect of the present invention, a disconnection button is arranged on the operation console, and when the disconnection button is pressed down forcefully, the line held by the line holding means is released.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 shows the system configuration of a private branch exchange system in one embodiment of the present invention.

The private branch exchange system includes a time-division channel switch 11. The time division communication path switch 11 is connected to an extension telephone 14 via a console 12 and a trunk 13. In the drawing, one trunk and one extension telephone are shown to make the explanation easier to understand, but in reality, multiple trunks and telephones are connected to the time-sharing channel switch 1.
1 is connected. The time division communication path switch 11, the operation console 12 and the trunk 13 each have a central processing unit 19.
is connected to. The central processing unit 19 is configured to control the line connection between the extension telephone 15 from which a call has been made and the operation console 12 by the time division communication path switch 11.

A transmitter/receiver (not shown) is disposed on the console 12 so that the operator can communicate with an extension telephone 15 or an outside telephone (not shown). The operator, while operating various buttons on the operation table surface 21 arranged on the operation table 12,
Incoming calls are forwarded and telephone calls are made using a handset (not shown).

FIG. 2 shows a part of the operation platform surface.

A plurality of buttons for performing various operations are arranged on the operation board surface 21. The disconnection button 22 is a button for disconnecting the line between the console 12 and an extension telephone or an outside telephone connected by the time-division call path switch 11. The call signal button 23 is a button for calling an on-hook extension telephone. Call signal button 2
When 3 is pressed, the contacts of the call signal button relay 24 shown in FIG. 1 are closed.

A paging signal information adding circuit 26 is arranged on the operation console 12 of the private branch exchange system. Calling signal information adding circuit 2
6, while the call signal button relay 24 is connected,
Encoded call signal information is output to the connected line.

FIG. 3 shows the calling signal information output from the calling signal information providing circuit.

The paging signal information 27 is added to the control signal together with the encoded voice signal, and is supplied from the paging signal information adding circuit 26 to the time-division channel switch 11.

The trunk 13 includes a paging signal information detection circuit 28. When the calling signal information detection circuit 28 detects whether or not the calling signal information 27 is added to the control signal sent together with the voice signal, it closes the calling signal information detection relay 29. The calling signal sending relay 31 operates in conjunction with the calling signal information detection relay 29. When the calling signal source 32 closes the calling signal sending relay 31, the calling signal source 32 becomes 16H.
2 call signals are sent to the extension telephone.

Next, the operation of the private branch exchange/stem configured as described above will be explained.

When the extension telephone 14 is on-hook and restored after a call between the extension telephone 14 and the operation console 12, a central processing unit 19 detects this and holds a time-division call path switch 11 between the extension telephone 14 and the operation console 12.

Even when on-hook of the extension telephone 14 is detected in the trunk 13, the time-division call path switch 11 does not release the line with the operating console 12, and holds the line until the disconnection button 22 is pressed. The call signal button 23 is pressed by the operator on the console 12.
When is pressed, the call signal button relay 24 closes, and the call signal information 27 is output from the call signal information providing circuit 26 together with the control signal. The paging signal information 27 is sent to the trunk 13 through a line maintained by a time-division channel switch.
The signal information is supplied to the calling signal information detection circuit 28 of.

When the calling signal information detection circuit 28 detects the calling signal information 27, the calling signal sending relay 29 closes.

When the calling signal sending relay 29 closes, the calling signal sending relay 31 closes in conjunction, and a calling signal is output from the calling signal source 32 to the on-hook extension telephone 14.

When it is not necessary to call the on-hook extension telephone 14, or after a call is completed due to a call, the operator console 12
When the disconnection button 22 is pressed, the line of the time division communication path switch 11 is released.

In the embodiment described above, the line of the time-division call path switch connected to the console is held after the extension telephone is on-hook until the disconnect button placed on the console panel is pressed. However, it may be held for a certain period of time using a timer.

〔Effect of the invention〕

As described above, according to the present invention, even if the telephone is on-hook, the line of the communication path switch is held and the ringing signal information is sent out, and this is detected and the ringing signal is output to the on-hook telephone. , a calling signal can be immediately sent to the extension telephone in conjunction with pressing the calling signal button. Furthermore, the burden on the central processing unit can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 are for explaining one embodiment of the present invention, of which Figure 1 is a system configuration diagram of a private branch exchange system, Figure 2 is a front view of the operation panel, and Figure 3 is a diagram showing the system configuration of a private branch exchange system. The figure is an explanatory diagram for explaining signals output from the console. 11... Time division communication path switch, 12...
...Operation console, 13...Trunk, 4...
・Extension telephone, 19...Central processing unit, 2...
...Disconnect button, 23...Call signal button, 4...Call signal button relay 6...Call number information giving circuit, 8...Call Signal information detection circuit, 9...
Calling signal information detection relay... Calling signal sending relay 2... Calling signal source.

Claims (1)

[Scope of Claims] 1. A plurality of extension telephones, an operation console that selectively accepts call requests from these extension telephones, and a call path switch that connects a line between the operation console and the extension telephones; a line holding means for holding the line of the extension telephone connected to the operation console even after being on-hook; a ring signal button disposed on the operation console; and a circuit for transmitting ring signal information when the ring signal button is pressed , a calling signal sending means for sending out to the line of the communication path switch held by the line holding means, a calling signal detecting means for detecting the calling signal sent from the calling signal sending means, and this calling signal detecting means. 1. A private branch exchange system comprising: a calling means for outputting a calling signal to the on-hook extension telephone when a calling signal is detected at the on-hook extension telephone. 2. The private branch exchange system according to claim 1, wherein the line holding means includes a timer and holds the line for a set predetermined time. 3. The private branch exchange system according to claim 1 or claim 2, wherein the operation console is provided with a disconnection button, and when the disconnection button is pressed, the line held by the line holding means is released.