JPH01137794A - Terminal equipment selecting and connecting system - Google Patents

Abstract

PURPOSE:To facilitate the selection/connection of a terminal equipment when the plural terminal equipments are connected to one subscriber's line by executing call with the aid of a ringing signal after a no-ringing call. CONSTITUTION:When an outgoing subscriber 11 dials the number of the subscriber's terminal equipment 108, a no-ringing trunk 14 inverts the voltage polarity of the subscriber's line 19 to a subscriber's terminal side selection/ connection equipment 17 and sends a no-ringing call signal. When a connection equipment 17 detects that, it sends a primary response signal. When the truck 14 detects that, it connects the line 19 to a PB center 15. The center 15 sends the needed number or digit of the terminal person's number by a PB signal to the connection equipment 17. When the connection equipment receives that, it directly loops the line 19 off. Next, a ringing trunk 16 sends a call signal (16Hz) to the connection equipment 17. By this call signal, the bell of a telephone set 180 is rung. Thus, the subscriber 11 and the telephone set 180 are connected and the call is carried out.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a system for calling/calling terminal equipment such as telephones from an exchange, and particularly relates to a method for calling/calling terminal equipment such as telephones from an exchange, and particularly when a plurality of such terminal equipment are connected to a pair of subscriber lines. This relates to a selective connection method.

[Conventional technology]

Conventionally, as a technology close to this type, there is a dial-in connection method of a PBX (private branch exchange).

This will be explained with reference to FIG. FIG. 4 is a block diagram showing a conventional PBX dial-in connection system, where 21 is a calling telephone, 22 is a central office exchange, 23 is a PBX capable of dial-in, 24 is a PBX extension telephone, and 25 is a trunk line to the PBX. It is.

The operation of this dial-in connection method will be explained with reference to the sequence shown in FIG.

PBX extension telephone 24 whose calling telephone 21 is the called number
When you dial the PBX extension number of
A calling signal (16 Hz) is sent as a starting signal to 3. The PBX 23 detects this signal and loops on the trunk line 25 in a DC manner (primary response). The exchange 22 detects this DC loop-on, and then the exchange 22
The specified extension number dialed by PBX2 is sent from the PB double signal.
Send to 3. When PBX 23 receives this number,
A calling signal is sent to the BX extension telephone 24, and the middle line 25 is looped off in a direct current manner to the exchange 22 (extension designated number reception completion signal). After that, PBX2
3 monitors the response of the extension telephone, and if it answers, trunk line 2
5 and extension telephone a24, and returns a loop-on signal to the exchange 22 (secondary response).

[Problem that the invention seeks to solve]

The PBX dial-in connection method has been explained above, but as the name suggests, this method is intended for PBXs, and is used in general homes or small and medium-sized offices, etc., to connect multiple numbers to a pair of subscriber lines. A connection that has 1
For usage situations where you want to use one phone number for office use and another phone number for home use,
There is a problem in that the PBX has become large-scale and cannot provide a selective connection method economically.

An object of the present invention is to provide a terminal device selective connection method that enables selective connection with a simple configuration.

[Means for solving problems]

The present invention provides a terminal equipment selective connection method in which a plurality of terminal equipments are connected to a pair of subscriber lines from an exchange, and one of the plurality of terminal equipment is selectively connected. The subscriber terminal sends a DC loop-on signal (primary response signal) for the silent call, and then the exchange
A terminal designation number is sent by a PB double signal, and the subscriber terminal side receives the terminal designation number and sends a DC loop-off signal to the exchange, and selectively connects the terminal equipment based on the terminal designation number, and the exchange Upon receiving the DC loop-off signal, a ringing signal is sent to the selected terminal device.
This ringing signal is used as a ringing signal, and a DC loop-on signal (secondary response signal) is sent to the exchange in response to a response from the terminal equipment.

In carrying out the present invention, the switching equipment is required to have the following functions. 1 ■ Silent call function (including reversing function) ■ Loop-on response from the terminal to silent calls J valley detection function
1 ■ Terminal designated number sending function using PB signal 1 ■ Response signal (loop off) detection function for terminal designated number
1. Ringing call signal sending function 2. Ringing call response signal (loop-on) detection function On the other hand, the subscriber terminal side is required to have the following functions.

■Detection of silent ringing signal and response signal (
Loop-on) sending function ■ Terminal designated number reception function using PB signal and response signal (loop off) sending function for it ■ Designated terminal selection function using terminal designated number ■ Terminal equipment status monitoring function [Example] Next, the present invention will be implemented. An example will be explained with reference to the drawings.

FIG. 1 shows an example of applying the method of the present invention to a space division type switch. In the figure, 1o is the control device, 1 is the originating subscriber (telephone), 12 is the network, 3 is the local trunk, 14 is the no-ringing trunk, 15 is the PB sender, 16 is the ringing trunk, and 7 is the subscriber terminal side selection connection. 180 to 18n are terminals (equipment (telephone)), and 19 is a subscriber line.

FIG. 2 shows the subscriber terminal side selection connection device 17 shown in FIG.
FIG. 2 is a block diagram showing the internal configuration of. 171 is a no-ringing signal receiver, 172 is a loop creation and call monitoring circuit, 173 is a PB double signal receiver, 174 is a selection connection circuit, and 175 is a microprocessor for controlling the circuits 171 to 174. 19 is subscriber line, 180~
18n is a terminal device.

An embodiment of the present invention will be described with reference also to the connection sequence shown in FIG.

When the originating subscriber 11 dials the number of the subscriber terminal equipment 180, the originating subscriber 11 is connected to the local trunk 13 of the network 12. Since the subscriber line 19 is determined by the dial of the originating subscriber 11, the control device 10 controls the no-ringing trunk 14 and the subscriber line 1.
9 is connected through network 12. Then, the no-ringing trunk 14 connects to the subscriber terminal side selective connection device 1.
7, the voltage polarity of the subscriber line 19 is reversed (reversed) and a non-ringing ring signal (for example, 2080 Hz, etc.) is sent out.

No-ring signal receiver 171 detects polarity reversal and no-ring ring signals and communicates this to microprocessor 175. Microprocessor 175 controls loop creation and call monitoring circuit 172 to create a DC loop. That is, the subscriber line 19 is looped on in a DC manner (primary response). The no-ringing trunk 14 detects this. The control device 10 thereby controls the subscriber line 1
9 to the PB sender 15.

The PB sender 15 sends the required number of digits (1 to 4 digits) of the subscriber number of the terminal equipment 180 received from the originating subscriber 11 to the PB double signal subscriber terminal side selection connection device 17. P
The B-fold signal receiver 173 receives the PB-fold signal. The microprocessor sensor 175 controls the loop creation and call monitoring circuit 172 and cancels the previously created DC loop signal. That is, the subscriber line 19 is looped off in a DC manner (extension designated number reception completion signal). At the same time, the selection connection circuit 174 is controlled, and the loop creation and call monitoring circuit 172
and the telephone 180 are connected.

On the other hand, the PB sender 15 detects cancellation of the DC loop. The control device 10 thereby reconnects the subscriber line 19 to the ringing trunk 16. The ringing trunk 16 sends a paging signal (16 Hz) to the subscriber terminal side selective connection device 17. Inside the subscriber terminal side selection connection device 17, a loop creation and call monitoring circuit 172
- the ringing signal is transmitted to the telephone 18 through the selective connection circuit 174;
0 and the telephone bell rings.

If the telephone 180 responds, a DC loop is created (secondary response), and the ringing trunk 16 detects this. The control device 10 thereby reconnects the subscriber line 19 to the trunk 13 within its own office. As a result, the originating subscriber 11 and the incoming telephone set 180 are connected, and a conversation is started. During the call, the monitoring circuit 172 monitors this and maintains the connection of the selection connection circuit 174.

The present invention has been described above in detail using a space-division type exchange as an example, but it goes without saying that the present system can be applied to other systems other than space-division type exchanges as long as the functions and connection sequences described above are provided.

〔Effect of the invention〕

As explained above, the method of the present invention activates the terminal side device with a no-ring signal from the exchange, sends a terminal selection signal from the PB double signal, and then sends a normal calling signal as a terminal calling signal. As a terminal side device,
It can be realized with a simple configuration such as a detection circuit for a silent ring signal, a PB signal receiver, a loop creation and monitoring circuit, a terminal selection circuit, and a control circuit that controls these, and connects multiple terminal devices to one subscriber line. If you choose to connect easily,
Moreover, it has an effect that can be provided economically.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an exchange and a terminal side device for explaining an embodiment of the present invention. FIG. 2 is a diagram showing an example of the block configuration of the terminal side device of FIG. 1. FIG. FIG. 4 is a block diagram for explaining the conventional PBX dial-in connection method. FIG. 5 is a diagram showing the sequence of the conventional PBX dial-in connection method. It is. 10... Control device 11... Originating subscriber 12... Network 13... Local trunk 14... No-ringing trunk 15...
PB sender 16...Ringing trunk 17...Subscriber terminal side selection connection device 180-18
n... Terminal equipment 19... Subscriber line 171... No-ringing signal receiver 172
...Loop creation and call monitoring circuit 173 ...
-PB signal receiver 174...Selection connection circuit 175...Microprocessor agent Patent attorney Yoshiyuki Iwasa 10...Control device 11...Calling subscriber 12...Network 13... Own office trunk 14...No-ringing trunk 15...PB sender 16...Ringing trunk 17...Subscriber terminal side selection connection device 180-18n...Terminal equipment Fig. 1 171...No-ringing signal receiver 172...
Loop creation and call monitoring circuit 173...PB signal receiver 174...Selection connection circuit 175...Microprocessor Fig. 2 Fig. 3

Claims (1)

[Claims] (1) In a terminal equipment selective connection method in which a plurality of terminal equipment are connected to a pair of subscriber lines from an exchange, and one of the plurality of terminal equipment is selectively connected, the exchange receives a reversal of the line voltage. The subscriber terminal sends a DC loop-on signal (primary response signal) for the silent call, and then the exchange
A terminal designation number is sent by a PB signal, and the subscriber terminal side receives the terminal designation number and sends a DC loop-off signal to the exchange, and selectively connects the terminal equipment according to the terminal designation number, and the exchange receives the terminal designation number. A ringing signal is sent by receiving the DC loop-off signal, and the selected terminal equipment uses this ringing signal as a ringing signal, and sends a DC loop-on signal (secondary response signal) to the exchange in response to the terminal equipment response. A terminal device selection connection method featuring: