JPH0821990B2 - Communication method of non-telephone terminals by public telephone network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to communication between a management center and a terminal using a public telephone network, and in particular, to a single telephone line on the terminal side such as a telephone and a gas meter reading terminal. The present invention relates to a communication method when a telephone terminal is connected.

(Prior Art) FIG. 2 shows an example of the configuration of a conventional system that uses a general public telephone network (hereinafter, simply telephone network) for communication between a management center (hereinafter, simply referred to as center) and terminals. is there. In FIG. 2, 1 is a telephone network, 2 is a center device, 3 is a center side adapter device, and the center device 2 is connected to the telephone network 1 through an adapter device 3 and a telephone line TL1. 4 is a terminal-side adapter device, 5 is a non-telephone terminal (hereinafter simply referred to as a terminal) to which meters, sensors and the like are connected, 6 is a telephone, and terminals 5 and 6 are telephone lines TL3 via the adapter device 4.
Connected to

The operation of the above configuration will be explained. First, when the terminal device 5 calls the terminal 5, the adapter device 3 is used to automatically dial the corresponding terminal telephone number to make a call, and after the call is made, the adapter device 3 is called. When about 2 is started, about 2.5 seconds after that, the adapter device 3 disconnects the telephone line to stop the call (temporary call). Further, when the terminal side adapter device 4 receives the ringing tone, it ignores the ringing tone for about 5 seconds and does not perform any operation. Here, after 5 seconds, the ringing tone is sent to the telephone 6 and the telephone 6 is made to ring. Therefore, if the ringing tone is cut off within 5 seconds, the telephone 6 does not have to ring once. On the other hand, if the adapter device 4 receives the ringing tone again after the temporary call, it judges that the call is from the center device 2 and connects the telephone network 1 and the terminal 5.

On the contrary, when data is transmitted and received from the terminal 5 to the center device 2, the corresponding center telephone number is dialed using the terminal side adapter device 4 as in known data communication, and the data is transmitted.

FIG. 3 is for explaining the reason why the adapter device 3 disconnects the telephone line 2.5 seconds after confirming the ringing tone and the reason why the terminal side adapter device 4 ignores the ringing tone for 5 seconds at the time of temporary calling. FIG. Here, it is assumed that the calling tone of the calling side and the calling tone of the receiving side are not synchronized.

According to Fig. 3, the ringing tone is make 1.0 seconds, break 2.0
If the terminal side adapter device 4 needs to receive the ringing tone for 0.3 seconds to recognize the ringing tone, the terminal side adapter device 4 recognizes that the ringing tone has been received. It can be seen that a maximum of 2.6 seconds (time from to in the figure) is required for this. Therefore, the adapter device 3
Even if the telephone line is disconnected 2.3 seconds after the call is recognized, the terminal side adapter device 4 can recognize the call. In addition, even if the telephone line is disconnected by the adapter device 3 after 2.3 seconds, if the ringing tone heard on each side of transmission and reception is asynchronous, the ringing tone is already heard on the receiving side before the adapter device 3 confirms the ringing tone. There is a possibility that the ringing tone is heard on the receiving side for a maximum of 4.9 seconds (from to in the figure). Therefore, in order to prevent the telephone 6 from ringing due to a temporary call from the center device 2, the terminal side adapter device 4 can be ignored for about 5 seconds.

(Problems to be Solved by the Invention) However, according to the above method, there is about 5 seconds in which the ringing tone is ignored in the terminal side adapter device 4, and the call originated from the general subscriber telephone set for the purpose of communication. Needlessly 5
There was a problem that you had to wait for a second.

In view of the above problems, an object of the present invention is to provide an excellent communication method capable of shortening unnecessary waiting time for a caller and switching connection between a telephone network and a telephone or non-telephone terminal. is there.

(Means for Solving Problems) In order to achieve the above object, the present invention connects a management center and a non-telephone system terminal through a public telephone network, and a terminal-side adapter device responds to an incoming call by using a public telephone. In the communication method of the non-telephone terminal by the public telephone network for switching the connection between the network and the telephone and the non-telephone terminal, the management center and the public telephone network are connected by two telephone lines, and the management center has the same telephone number. , The first call is made simultaneously on two lines, and after confirming the busy tone from one of the lines for the first call, the first call is stopped after a predetermined time has elapsed,
Subsequently, the second call is made with the telephone number, and if the terminal side adapter device confirms the first call and the second call, the public telephone network and the non-telephone terminal are connected. did.

(Operation) According to the present invention, the management center and the public telephone network are connected by two telephone lines, whereby the management center uses the two lines to simultaneously make the first call with the same telephone number.
If the terminal side is not busy here, a busy tone is sent back to the management center from one line and a ringing tone is sent back from the other line, and after confirming this busy tone, the management center waits for a predetermined time after a preset time. One call is stopped and then a second call is made using the telephone number. When the terminal side adapter device confirms the first and second calls from these management centers, it connects the public telephone network and the non-telephone system terminal.
This enables data transmission / reception between the management center and non-telephone terminals.

(Embodiment) FIG. 1 is a system configuration diagram to which the present invention is applied. In FIG. 1, 10 is a telephone network, 20 is a center device of a gas management center, 30 is a center side adapter device, and the center device 20 is connected to the telephone network 10 via an adapter device 30 and telephone lines TL1 and TL2. There is. 40 is a terminal side adapter device, 50
Is a non-telephone terminal to which meters, sensors, etc. are connected, for example, a gas meter reading terminal (hereinafter, simply terminal), 60 is a telephone,
The terminal 50 and the telephone 60 are connected to the telephone network 10 via the adapter device 40 and the telephone line TL3.

FIG. 4 is a block diagram showing the configuration of the center-side adapter device 30. The adapter device 30 controls the center-side interface circuit 31, which is an interface with the center device 20, and the control of transmission / reception between the center device 20 and the terminal 50. Control circuit
32 and control circuit for dial signals corresponding to terminal telephone numbers
It is composed of a signal sending circuit 33 for outputting to 32, a transmitting station line interface circuit 34, a receiving station line interface circuit 35, and a power source 36 for supplying power to each circuit, for example, a commercial AC 100V power source.

Explaining the operation on the center side with the above configuration, a transmission request from the center device 20 to the terminal 50 is input to the control circuit 32 via the interface circuit 31. The control circuit 32 reads out a dial signal corresponding to the relevant terminal telephone number from the signal transmission circuit 33, simultaneously transmits the same telephone number through the office line interface circuit 34 using the telephone lines TL1 and TL2, and makes a temporary call (first Call once) Start processing. Here, if the called telephone is not busy, either one of the two telephone lines TL1 and TL2 is returned as a busy tone and the other is returned as a ringing tone. When the control circuit 32 identifies the busy tone, one of the telephone lines to which the busy tone is returned is disconnected, and after the elapse of a predetermined time, for example, 2.3 seconds later, the other telephone line to which the ringing tone is returned is disconnected and provisionally cut off. The call processing ends. After completion of this temporary calling process, the control circuit 32 returns within a predetermined time, for example,
Within 40 seconds, the same telephone number as above is used to make a call to the terminal 50 using one of the telephone lines TL1 and TL2. After that, when the connection with the terminal 50 is completed, the center device 20 sends the center identification signal CS to the terminal 50 within a predetermined time, for example, within 2 seconds, and when a response thereto is received, data transmission / reception is continued.

If the telephone lines TL1 and TL2 are busy during the temporary call, the temporary call process is performed again after a predetermined time has elapsed.
On the other hand, when the data is transmitted from the terminal 50 to the center device 20, the data is transferred to the control circuit 32 via the curve interface circuit for reception 35. At this time, there is no problem even if the receiving station line interface circuit 35 and the transmitting station line interface circuit 34 are shared.

FIG. 5 is a block diagram showing the configuration of the terminal-side adapter device 40. The adapter device 40 switches to connect the telephone network 10 and the telephone 60 directly in the event of a power failure or the like.
A station line interface circuit 42 for detecting an incoming call, a terminal 50, a control circuit 43 for switching connection between the telephone 60 and the telephone 10 and controlling incoming and outgoing calls, a telephone 60 and a control circuit 43, that is, the telephone network 10. Interface, call detection, telephone 60
A telephone interface circuit 44 for supplying power to the
A terminal interface circuit 45, which is an interface between the terminal 50 and the control circuit 43, that is, the telephone network 10, performs reception detection of the terminal 50, procedure control, and power supply to the terminal, and a dial signal of the center telephone number to the control circuit 43. Output signal output circuit
46 and a power supply 47 for supplying electric power to each circuit, for example, a commercial AC10
It consists of a 0V power supply.

Further, in the control circuit 43 of the adapter device 40, the criterion for selecting whether to connect the incoming call to the telephone 60 or the terminal 50 depends on the length of the first ringing tone from the telephone network 10.
When recognizing the ringing tone, the control circuit 43 ignores the ringing tone for 3.4 seconds after the ringing tone is received, and connects the telephone network 10 and the telephone 60 after 3.4 seconds have elapsed. When the ringing tone is cut off within 3.4 seconds, it is determined that the call is temporary from the center device 20, and the center call waiting mode is set. An incoming call within 40 seconds thereafter is identified as a call from the center device 20. However, 40
If there is no incoming call within seconds, it returns to normal mode,
After the tentative call is completed, a predetermined time (several seconds) in which it is considered that there is no call from the center apparatus 20 is set to off-hook to prevent the above sequence from being interrupted by an incoming call from another subscriber telephone. To do. On the other hand, for an incoming call within 40 seconds, the off-hook state is set, and when the center identification signal is received (within 2 seconds), the telephone network 10 and the terminal 50 are connected.

Next, at the time of tentative call, after the center side adapter device 30 confirms the busy tone, the telephone line is disconnected after 2.3 seconds, and the reason why the terminal side adapter device 40 ignores the ring tone for 3.4 seconds,
This will be described with reference to FIG. At least 0.3 seconds are required for recognizing the busy tone and ringing tone, and the busy tone is repeated at a cycle of 0.5 seconds for make and 0.5 seconds for break. According to FIG. 6, if the center side adapter device 30 disconnects the telephone line 2.3 seconds after recognizing the busy tone, the terminal side adapter device 40 is called for 2.6 seconds. The ringtone can be recognized at least once (from the middle of the figure),
You can recognize that a temporary call is being received. However, since the busy tone on the center side and the ringing tone on the terminal side are out of phase, if the telephone line is disconnected within 3.4 seconds (up to the middle of the figure) at the terminal side adapter device 40, the center device 20 It should be recognized that it is a call from. Therefore, the terminal side adapter device 40 ignores the ringing tone for 3.4 seconds, sends out 3.4 seconds or later to the telephone 60, rings the bell, and notifies that there is a call from a general subscriber telephone.

Here, the busy tone on the center side and the ringing tone on the receiving side are supposed to start returning at the same time, but depending on the number of exchanges between the center and the terminals, the busy tone may start returning late, so that busy The time from the beginning of the sound to the disconnection of the ringing tone should be 2.3 seconds, which is short. However, even in that case, the ringing time of the terminal side adapter device 40 is ignored.
You can leave it as it is.

Next, the operation of the terminal side of the present invention having the above configuration will be described below.
It will be described step by step with reference to the flowcharts of FIGS.

First, the terminal side transmission will be described with reference to FIG. When making a call using the telephone 60 normally, when the receiver goes off-hook (S1), the telephone interface circuit 44 detects this off-hook state (S2) and notifies the control circuit 43 that the telephone is busy. Yes (S3). Here, the control circuit 43 connects the telephone 60 to the telephone network 10 (S4), and sends a signal indicating the off-hook state to the telephone line TL3 via the station line interface circuit 42 and the changeover switch 41 (S5). ), After that, normal telephone call is made (S
6). On the other hand, the transmission request from the terminal 50 to the center device 20 is input to the control circuit 43 via the non-telephone system interface circuit 45 (S7). The control circuit 43 determines whether or not the telephone is in use (S8), then sends a signal indicating that the telephone is off-hook to the telephone line TL3, and sends a dial signal for the corresponding center telephone number. Read from 46 (S
9), this telephone number is sent to the telephone line TL3 via the office line interface circuit 42 and the changeover switch 41 (S10), and thereafter the data communication between the center device 20 and the terminal 50 is performed (S11).

Next, center-side transmission will be described with reference to FIG.
The call from the center device 20 is sent from the center side adapter device 30,
It is received as a ringing tone at the terminal side adapter device 40 via the telephone lines TL1 and TL2 and the telephone network 10 (ST1). This ringing tone is input to the control circuit 43 via the changeover switch 41 and the office line interface circuit 42, and the control circuit 43 recognizes that the input is a ringing tone (ST2). When the control circuit 43 recognizes the ringing tone, it determines whether or not 2.3 seconds have elapsed from that point (ST3), ignores the ringing tone if 2.3 seconds has not elapsed (ST4), and rings within 3.4 seconds. It is determined whether or not the sound is cut off (ST5). If it is determined in step ST5 that the ringing tone is not cut off, the process returns to step ST3. If it is determined in step ST3 that 2.3 seconds have passed, the telephone network 10
And the telephone 60 are connected to ring the telephone 60 bell (ST
6).

On the other hand, if it is determined in step ST5 that the ringing tone is cut off, it is recognized that the call is temporary from the center device 20 (ST
7) The center call waiting mode is entered (ST8). here,
It is determined whether or not there is an incoming call within 40 seconds after the ringing tone is cut off (ST9). If it is determined that there is no incoming call, the center call waiting mode is returned to the normal mode (ST10), step ST9.
When it is determined that there is an incoming call, the control circuit 43 puts it in the off-hook state (ST11), determines whether the center identification signal CS is received within 2 seconds (ST12), and receives it within 2 seconds. If not, immediately disconnect from the telephone line TL3,
Return to normal mode. If it is determined in step ST12 that the center identification signal CS has been received within 2 seconds, the telephone line TL3 and the terminal 50 are connected via the non-telephone system interface circuit 45 (ST13). After that, normal data transmission / reception communication is performed.

According to the present embodiment, since the call from the center device 20 can be simultaneously made by using two telephone lines TL1 and TL2, the time for ignoring the ringing tone can be shortened, and an excellent system with little influence on ordinary telephone calls can be obtained. Can be realized.

Incidentally, in the present embodiment, the ignore time of the ringing sound in the terminal side adapter device is set to 3.4 seconds, but it is needless to say that it is not limited to this, and the optimum value is examined for each system,
It only needs to be set and can be updated. Furthermore, commercial AC100V is used as the power source for the center side and terminal side adapter devices.
Although the power source is used, the present invention is not limited to this, and it is also possible to use a battery, or a solar cell in the case of outdoor installation. Although the terminal-side adapter device and the non-telephone system terminal are separate devices for the sake of description, they may be combined in the same device.

(Effects of the Invention) As described above, according to the present invention, the management center and the non-telephone system terminal are connected via the public telephone network, and the public telephone network and the telephone set are responded to by an incoming call at the terminal side adapter device. In a communication method of a non-telephone terminal by a public telephone network for switching connection with a non-telephone terminal, the management center and the public telephone network are connected by two telephone lines, and the management center has two telephone lines with the same telephone number. At the same time, the first call is made, and after confirming the busy tone from one of the lines for the first call, the first call is stopped after a preset predetermined time has elapsed, and then the telephone number is continued. Make a second call with
When the terminal side adapter device confirms the first call and the second call, it connects the public telephone network and the non-telephone terminal so that the center can call the terminal using two lines. You can make a phone call with the terminal adapter device,
You can shorten the ringing time ignored for switching non-telephone terminals,
There is an advantage that it is possible to realize an excellent system capable of efficiently using a telephone for a call.

Furthermore, since data can be sent and received efficiently using the public telephone network, in addition to various automatic meter readings, it can be used for home security systems when sending and receiving data between the center and terminals, online systems with terminals installed on the telephone line, etc. Applicable.

Further, the present invention can be applied to the case where various non-telephone devices such as a communication between a communication center and a personal computer and a communication between a facsimile center and a facsimile machine are communicated by a public telephone network by personal computer communication.

[Brief description of drawings]

FIG. 1 is a system configuration diagram to which the present invention is applied, FIG. 2 is a system configuration diagram of a conventional example, FIG. 3 is a diagram for explaining timing of conventional temporary calling, and FIG. 4 is a center side adapter device. 5 is a block diagram showing the configuration of the terminal side adapter device, FIG. 6 is a diagram for explaining the timing of temporary calling according to the present invention, and FIG. 7 is a terminal side according to the present invention. FIG. 8 is a flow chart for explaining the operation in the case of call origination, and FIG. 8 is a flow chart for explaining the operation of the center side call in the same manner. In the figure, 10 ... Public telephone network, 20 ... Center device, 30 ... Center side adapter device, 40 ... Terminal side adapter device, 50 ... Non-telephone system terminal, 60 ... Telephone.

Continuation of the front page (72) Inventor Yashiro Fukawa 2-31-6 Hiratsuka, Hiratsuka City, Kanagawa Any Co., Ltd. (56) Reference JP-A-1-130656 (JP, A) JP-A-1-130658 ( JP, A) JP 61-295750 (JP, A)

Claims (1)

[Claims] 1. A public system in which a management center and a non-telephone system terminal are connected via a public telephone network, and a connection is switched between the public telephone network and a telephone or a non-telephone system terminal in response to an incoming call by a terminal side adapter device. In a communication method of a non-telephone terminal by a telephone network, a management center and a public telephone network are connected by two telephone lines, and the management center makes a first call at the same time for two lines with the same telephone number. After confirming the busy tone from any one of the lines, the first call is stopped after a preset time has elapsed, and then the second call is made with the telephone number. The device connects the public telephone network and the non-telephone system terminal when the first call and the second call are confirmed, and the communication of the non-telephone terminal by the public telephone network is characterized in that Method.