JPS62172898A - Telephone line switching equipment - Google Patents

Abstract

PURPOSE:To reduce a communication facility cost by connecting an allocated terminal equipment to a telephone line, when a generation pattern in a call bell controller is switched to a call bell ringing pattern allocated to the terminal equipment. CONSTITUTION:A call bell controller 28 is provided at a center equipment and the controller 1 in the equipment outputs a dial outgoing instruction to a dial outgoing equipment 2, and outputs an operation signal to a detection 3. Thereby, when the equipment 2 outputs a dial signal to a telephone line 4, the line 4 rings the call bell of an outgoing opposite, and also, returns an answer tone signal to an outgoing original. The detector 3, in case of receiving the answer tone signal and detecting that is coincides with either of the call bell ringing patterns allocated to terminal equipments 6-8, outputs a coincidence signal to the controller 1. The controller 1, when the coincidence signal is being inputted, controls a switching device 5, and connects the line 4 to the terminals equipment coincided with the call bell ringing pattern out of the terminal equipments 6-8. Therefore, it is possible to connect a large number of terminals with one line, thereby reducing the communication facility cost remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone line switching device in which a plurality of terminals are connected to one @waist line.

[Conventional technology]

Generally, when terminals in one building or office are provided with, for example, a personal computer, and data is transmitted from a central device to the terminals using telephone lines, as many telephone lines as there are terminals are required. Regarding this transmission method, see 1, for example, ``Shimizu and Suzuki, published by Ohmsha.
6 [Problems to be solved by the invention] In the above conventional example, if there are a large number of terminals, the number of telephone lines becomes large and the cost of communication equipment becomes extremely expensive. There was a problem. SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive switching device for communicating between a plurality of terminals using one telephone line, in order to reduce the cost of communication equipment.

[Means for solving problems]

The above problem is solved by assigning a unique ringing pattern to each terminal, generating a ringing pattern unique to the terminal using a ringing bell control device installed in the center device, and detecting this ringing pattern. This problem can be solved by providing the terminal with a switching device for connecting to a terminal that matches this ringing pattern.

[Effect]

A call bell control device provided in the center device outputs a telephone line dial signal and a call bell ringing pattern unique to the terminal device to the telephone line.

A specific telegraph line is designated by the dial signal, a switching device is operated by the ringing pattern of the ringing bell, and a connection is made to a specific terminal.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the center device (not shown) includes a call bell control device 28, and the center device (not shown) includes a call bell control device 28.
8 is composed of a control device 1, a dial generator 2, and a detection section 3, and is connected through a telephone line 4 to a switching device 5 and three terminal devices 6, 7, and 8.

As shown in FIG. 4, the normal ringing pattern of the telephone line is set to have a ringing time of 1 second and a non-ringing time of 2 seconds.

In FIG. 2, the internal configuration of the detection device 3 is such that when the dialing device 2 sends a dial signal and a call to the telephone port NJA4, the telephone line 4 rings the call bell of the destination and sends an answer tone signal to the source. return. an answer tone detection section 9 that detects this answer tone signal and outputs an answer tone detection signal 12;
A setting switch unit 11 that presets the number of detections of
It consists of a counter part 10 that outputs a match signal 15 when the number matches a set number of 1. In addition, the setting switch section 11
The set number is assigned in advance to the terminal device 6°7.8. The control device 1 also has the function of outputting a dialing command 13 to the dialing bag [2, outputting an operation signal 14 to the detecting device 3, and cutting off the telephone line 4 in response to a coincidence signal 15 from the detecting device [3]. (not shown).

In FIG. 3, the internal configuration of the switching device 5 includes a call bell detection section 16 that detects a call bell signal from the telephone line 4 and outputs a call bell ringing signal 25, and a call bell detection section 16 that detects a call bell signal from the telephone line 4 and outputs a call bell ringing signal 25, and a non-ringing period that is determined by receiving the ringing signal 25. is measured, and when a predetermined period of non-ringing time elapses, for example, 3 seconds, a counter stop signal 26 is generated.
a timer part 18 that outputs a timer part 18 that counts the number of times the ringing signal 25 is input until the counter stop signal 26 is input, and outputs a plurality of relay control signals 22, 23, and 24 depending on the counted number of times; Terminal 6, 7.8
Upon receiving the termination signal 27 from the relay control signal 22
, 23, 24, and the respective contacts 19a, 20a according to the relay control signals 22, 23, 24.

It consists of relays 19, 20, 21 which select the circuit connected to the terminals 6, 7.8 by closing 21a.

Next, the operation of selecting the terminal device 6 from the control device 1 will be explained.

FIG. 5 is an example showing a ringing pattern of a ringing bell when the switching device 5 selects the terminal device 6. At this time, the setting number is set to 1 by the setting switch section 11.

The control device 1 outputs a dial transmission command 13 to the dial transmission device 2, and outputs an operation signal 14 to the detection device. The dialing device 2 receives the dialing command 13 and outputs a dialing signal to the telephone line 4. The detection device 3 answers the answer tone returned from the telephone line 4 to the originator.
Detected by tone detection section 9, answer tone detection signal 1
2 is output to the counter part 10. The counter section 1o outputs a coincidence signal 15 to the control device 1 when the number of inputs of the answer tone detection signal 12 matches the number set by the setting switch section 11 (here, 1).

The control device 1 connects the telephone line 4 when the coincidence signal 15 is input.
Cut off the connection with. After 3 seconds have elapsed, the telephone line 4 is connected again and the dialing command 13 is re-outputted to the dialing device 2. The dial transmitting device 2 transmits a dial signal to the telephone line 4 again.

As described above, the call bell ringing pattern shown in FIG. 5 can be transmitted on the calling side.

On the other hand, the switching device 5 detects a calling bell signal from the telephone line 4 using the calling bell detecting section 16.

A ringing signal 25 is output to the timer part 18 and the counter part 17. Upon receiving the call bell signal shown in FIG. 5, the call bell detector 16 outputs the ring signal 25 for 1 second, and
After seconds have elapsed, the ringing signal 25 is output again.

The timer part 18 receives the ringing signal 25 and sets the non-ringing time timer to O. When a non-ringing time of 3 seconds or more elapses from when the ringing signal 25 is no longer input until when the next ringing signal 25 is input, a counter stop signal 26 is output to the counter part 17.

The counter part 17 receives the ringing signal 25 from the call bell detection part 16, and after counting once, the timer part 18
The counter stop signal 26 is then received. The counter part 17 stops counting when the counter stop signal 26 is input, and then when the first ringing signal 25 is input, a relay control signal 22 is sent to the terminal specified by the counter value (1 in this case). Output.

The relay 19 is activated by the relay control signal 22, the contact 19a is closed, and the control device 1 can be connected to the terminal device 6.

The same procedure can be applied to the terminals 7 and 8 as well.

When the communication is completed, the counter part 17 indicates the terminal device 6, 7.
．． Upon receiving the end signal 27 from 8, the relay control signal 22
, 23, 24 should be stopped.

〔Effect of the invention〕

According to the present invention, since each terminal device can be efficiently selected and connected, a large number of terminal devices can be connected to one telephone line, and communication equipment costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is an overall connection diagram of a call bell control device and a terminal according to an embodiment of the present invention, FIG. 2 is an internal configuration diagram of the call bell control device, FIG. 3 is an internal configuration diagram of a switching device, and FIG. 4 5 is a normal call bell ringing pattern, and FIG. 5 is a call bell ringing pattern according to an embodiment of the present invention. 1... Control device, 2... Dial transmission device, 3...
・Detection device, 4...Telephone line, 5...Switching device, 6
, 7.8...Terminal device, 28... Call bell control device.

Claims (1)

[Claims] 1. In a device equipped with a center device and a plurality of terminal devices connected via one telephone line from the center device, a unique call bell ringing pattern is assigned to each of the terminal devices, and the call bell ringing pattern is generated. An automatic switching device for terminal devices, comprising a call bell control device and a switching device that connects to the assigned terminal device when the generation pattern of the call bell control device becomes a predetermined call bell ringing pattern. .