JPS62225062A - Terminal switching device - Google Patents

Abstract

PURPOSE:To attain the automatic switching between a telephone set and a data terminal equipment by providing a means sending a pseudo reply signal at a call and a means connecting switchingly a subscriber line to a data terminal equipment at the reception of terminal equipment identification signal. CONSTITUTION:When a terminal equipment 7 makes a call and the subscriber number of a subscriber's system is sent, a call signal is sent to a subscriber line 4 from a telephone network as well known. A call signal is recognized by a detection circuit 34, as a result a pseudo reply signal sending means 32 is started via a control line 50 to form a loop circuit via a specific impedance between subscriber lines and a pseudo reply signal is sent to the telephone network. The telephone network consisting of exchanges 5,6 forms a channel by the pseudo reply signal to attain the signal transmission/reception by a voice band frequency. The terminal equipment 7 sends a terminal equipment identification signal representing that the call is a data call, it is recognized by the reception circuit 33 of the subscriber's system, a switching circuit 31 is driven and the subscriber line 4 is switched to the terminal equipment 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a terminal that automatically switches between a telephone and data terminal equipment that share the same subscriber line in a home system connected to an analog telephone switching network. This invention relates to a switching device.

[Conventional technology]

In the 15DN network, which has been studied for practical use in recent years, the home system consists of digital telephones and various digital terminal devices, and switching connections between these devices are made using CCI.
This will be done automatically using the D channel signal as recommended by the TT.

- In the existing analog telephone network, there is no interfering signal on the D channel, and if a telephone and a data terminal device such as a 7-axis or personal computer are connected to the same analog subscriber line, the call If the connection cannot be automatically switched when a call is received, and the call is always connected to a device on the other side, and the call is to another device, there is a method for the receiver to decide and manually switch the connection. It is taken.

[Problem that the invention seeks to solve]

However, these conventional methods cannot automatically receive data from terminal equipment, so they cannot be integrated into existing analog telephone networks.
Unlike the 5DN network, it has the disadvantage that it is difficult to implement due to the functionality of terminal equipment identification.

[Failure to solve the problem]

In order to solve these drawbacks, the present invention provides a data terminal device with a terminal device identification function using the sound P1 band frequency.

[For production]

The data terminal equipment automatically receives the call.

[Implementation]

The present invention will be explained in detail below with reference to Examples. In FIG. 1, 5 and 6 represent analog subscriber line exchanges (local exchanges tm), and the chain line containing them represents an analog telephone network. T indicates the name of a terminal device having a function of transmitting a terminal device identification signal. In the following explanation, a case will be described in which terminal T makes a call. Reference numeral 1 indicates an existing analog telephone, 2 indicates a data terminal device such as a facsimile or a personal computer, and 3 indicates a pseudo response signal sending means, a terminal equipment identification signal receiving means, and an analog subscriber line 4, which are characteristics of the present invention, to the telephone 11R. It is a switching device having means for switching connection to the data terminal equipment 2, and the telephone 1. The terminal 2 and the switching device 3 constitute a home system. The details of the switching device 3 can be found in the second section.
31 is an analog subscriber &14'
Alternatively, it shows a switching circuit that switches and connects to the terminal 2, and 32 is a pseudo response signal sending means that creates a loop with a specific impedance to the analog subscriber line. 34 is an incoming call? The detection circuit 35 for detecting a calling signal, etc. shown in FIG. 33 is sent from the terminal 7 via the analog telephone network. This is a signal circuit that indicates a receiving circuit for a terminal identification signal, and determines the presence or absence of the identification signal using multiple frequencies in the audio band, and issues a switching instruction ft to the switching circuit 31. Also, switching equipment f
Dotted lines 50, 51, 52, 53, 54 in tB indicate control lines for transmitting control signals, respectively.

Next, the function and operation of this system will be explained according to the flow of the call, taking as an example a case where a data call occurs in the home system. When the terminal 7 makes a call and sends out the subscriber number of the home system, a signal is sent to the subscriber line 4 from the telephone network, as is well known. The paging signal is recognized by the detection circuit 34, and as a result, the pseudo response signal sending means 32 is activated via the control line 50, a loop circuit is formed between the subscriber lines via a specific impedance, and the communication network is established. A pseudo response signal is sent out. In addition, the pseudo response signal and the ninth one are:
Phone! ! ! This is because the response signal from terminal 1 or terminal 2 is the original response signal, and the purpose of the pseudo response signal is simply to create a communication path in the telephone network. The telephone network composed of exchanges 5, 6, etc., using pseudo response signals is transmitted between the terminal T and the above-mentioned home system)? A communication channel is created and signals can be sent and received using voice band frequencies. In response to the response from the destination home system, the terminal T sends out a terminal equipment identification signal indicating that the call is a data call, and this signal is recognized by the reception circuit 33 of the home system via the telephone network, and the control @
51', the switching circuit 31 is activated, and the subscriber line 4 is switched and connected to the terminal 2.

The case where the call is a data call has been described above, but next, the case where the call is a telephone call will be explained. In the case of a telephone call, the process up to the establishment of a communication route in the telephone network is the same as in the case of a data call. However, in a telephone call, since the calling party is not a data terminal, a terminal equipment identification signal indicating a data call is not sent to the home system. The receiving circuit 33 has a function to determine that it is a telephone call if a signal does not arrive within a certain period of time. Start calling operation. When the telephone 1 responds, the signal circuit 35 detects the response signal and connects the control line 53
The switching circuit 31 is driven through the subscriber line 4fjc telephone l! 1 to complete the automatic switching operation. In the above embodiments, the terminal device identification signal is not present in the case of a telephone call, but the present system also includes a case where there is an identification signal for a telephone call. In addition, in the case of a telephone call, during the blank time from the time of the pseudo-answer until the called party actually answers, there is a method such as playing an announcement to that effect.
It's okay if you don't mind.

[Effects of the Invention] As described above, according to the present invention, since an identification signal is transmitted at the time of switching, automatic switching between telephones and data terminals is possible without modifying the existing telephone network. This has the advantage that automatic switching can be performed when connecting data terminals such as facsimiles and personal computers, which will be increasingly used in the future, to the telephone network.

[Brief explanation of drawings]

FIG. 1 shows a block diagram for fully explaining an embodiment of the present invention, and FIG. 2 is a block diagram showing the detailed configuration of the embodiment. 1...1! Phone, 2, 7-... Terminal, 3...
Switching device, 31--Switching circuit, 32--Pseudo response signal sending means, 33--Receiving circuit, 34--
Detection circuit, 35...I signal circuit, 4...e analog subscriber line, 5, 6...exchange. Patent applicant: Nippon Kanki Co., Ltd. Agent: Masaki Yamakawa (and 2 others) 1st
Figure 2

Claims (1)

[Claims] A terminal switching device that switches between a telephone set connected to a subscriber line and a data terminal device, comprising a pseudo response signal sending means for sending a pseudo response signal when a call is received, and a pseudo response signal sending means for switching the subscriber line to the data terminal device when receiving a terminal device identification signal. 1. A terminal switching device comprising: switching means for switching and connecting.