JPH0323756A - Data transmission method for multiple party line - Google Patents

Abstract

PURPOSE:To receive data and to send a multiple address message even before placing a telephone or in absence by selecting data transmission terminal equipment by sending the selection signal of an exchange, transmitting data by closing the loop of the terminal equipment, and ringing a telephone set by the completion of data transmission. CONSTITUTION:A data transmission processing function is attached on the exchange 1 and a line circuit 2, and a data reception terminal 5 is provided with an individual selection signal reception circuit 11, a circuit to perform the opening/closing of the loop, and a data reception circuit 12, and performs the closing of the loop by receiving an individual selection signal, and generates a data communication line between an exchange line circuit 2. When the data transmission is completed, the data transmission terminal 5 performs the release of the loop, and rings the telephone set 4 by sending a call signal from the exchange line circuit 2. In such a way, the data transmission can be performed before performing speech, and a respondent can communicate with a caller after observing reception data, and also, the data can be received even in absence, and also, the data transmission of multiple groups with multiple address can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a data transmission method for multiple subscriber telephone lines. (Prior Art) Conventionally, in the case of multiple subscriber telephone lines, data transmission was performed once as a call using an adapter to which a separate individual number was assigned, in the same way as with multiple subscriber telephones.

(Problem to be Solved by the Invention) However, in the conventional data transmission method described above, there is a limit to the number of telephones that can be connected to a multiple common subscriber line, and data transmission cannot be performed before a call is made. The present invention solves these conventional problems, and provides a data transmission method that allows data to be received before a call or even when the caller is absent, and to send a circular message using multiple common subscriber lines. The purpose is to (Means for Solving the Problem) In order to achieve the above object, the present invention adds a data transmission processing function to an exchange and a line circuit, and a data receiving terminal is connected to an individual selection signal receiving circuit and a loop closing/opening circuit. and a data receiving circuit, which closes the loop by receiving the individual selection signal and generates a data communication path with the exchange line circuit. When data transmission is completed, the data transmission terminal opens the loop and sends out a ringing signal from the exchange line circuit, allowing the corresponding telephone to ring. (Function) Therefore, according to the present invention, data can be transmitted to the terminal device before the call by the calling operation of the exchange, so the responder can talk to the caller after viewing the received data, and even if the caller is not present, the responder can talk to the caller. Can receive data. It is also possible to transmit data for a group all at once by broadcasting. (Embodiment) Figure 1 shows the structure of an embodiment of the present invention.
Figure 2 shows the detailed configuration of the exchange line circuit in the embodiment shown in Figure 1, Figure 3 shows the block configuration of the data receiving terminal in the embodiment shown in Figure 1, and Figure 4 shows the line circuit in the embodiment shown in Figure 1. FIG. 5 shows an example of line timing for broadcast data transmission in the embodiment of FIG. 1. 1st
In the figures, 1 is an exchange, 2 is a line circuit of the exchange 1, 3 is a line of a multiple subscriber line, 4 is a telephone, 5 is a data receiving terminal, 6 is a power supply circuit, 7 is an amplifier, 8
9 is a switching element for sending out a selection signal and a calling signal; 9 is a switching element for reversing line 3; 10 is a polarity detection circuit; 11
12 is a selection signal detection circuit, 12 is a loop closure/data reception circuit, 13 is a control circuit, and 14 is a display circuit. Next, the operation of the above embodiment will be explained. In the above embodiment, the calling operation of the data receiving terminal from the exchange 1 operates the switching element 9 of the line circuit 2 to invert the polarity.
Prohibit off-footer on telephone 4 connected to line 3. The switching element 8 is operated to send a selection signal to the line 3 from the amplifier 7. The selection signal is received by a telephone 4 and a data receiving terminal 5 connected to the line 3. As shown in FIG. 3, the data receiving terminal 5 detects the polarity reversal caused by the switching element 9 using the polarity detection circuit 10 and transmits it to the control circuit 13.
Further, the selection signal detection circuit 1l detects the coincidence of the selection signals sent from the line 3, and when it detects the coincidence of the selection signals, it transmits it to the control circuit 13. When the control circuit 13 receives a match, it issues a command to the loop closing/data receiving circuit to close the loop of the line 3. When this loop closure is detected by the power supply circuit 6 of the line circuit 2, the switching element 8 is restored and the transmission of the selection signal is stopped, and a data communication path is configured between the line circuit 2 of the exchange and the data receiving terminal 5 to receive data. Start. When the control circuit l3 detects the end of data reception, it instructs the loop closing/data receiving circuit 12 to end data reception and open the loop. It also instructs the display circuit 14 to display the received data. On the other hand, when the exchange 1 detects the loop opening through the power supply circuit 6, it operates the switching element 8 again and inputs the calling signal to the amplifier 7. The calling signal input to amplifier 7 is sent to line 3. The ringing signal sent to line 3 is transmitted to the telephone 4 that received the first selection signal.
only the phone receives this and rings to notify you of the incoming call. Figure 4 shows the line timing chart explained above. In this manner, according to the above embodiment, the data receiving terminal receives data before the telephone 4 rings, so that the received data can be confirmed during a call. Additionally, since data is received even when the user is not present, the data can be checked later. In the case of broadcast data transmission, the end of data transmission is controlled by the control circuit 13 of each data receiving terminal 5, as shown in FIG.
is detected and instructs the loop closing/data receiving circuit 12 to end data reception and open the loop. When the loop is opened at all data receiving terminals 5, the power supply circuit 6 of the line circuit 2 detects the loop opening, and the exchange 1 restores the line. In this way, simultaneous broadcasting and group broadcasting can be performed.
(Effects of the Invention) As is clear from the above examples, the present invention has the following effects. (1) Data is transmitted before answering, so it does not interfere with calls. (2) Since the caller's line number and message are transmitted even when the caller is absent, the received message can be checked later.

(3) Broadcast and group broadcast messages can be transmitted without ringing the telephone.

[Brief explanation of drawings]

Fig. 1 is a diagram of a data transmission structure of a multi-community telephone line in an embodiment of the present invention, Fig. 2 is a switch line circuit diagram in an embodiment of the invention, and Fig. 3 is a diagram of a data transmission line in an embodiment of the invention. A data receiving terminal block diagram, FIG. 4 is a line timing diagram in the embodiment, and FIG. 5 is a timing diagram for broadcast data transmission in the embodiment. 1...Switchboard, 2...Line circuit, 3...
Line, 4...Telephone, 5...Data receiving terminal,
6...Power supply circuit, 7...Amplifier, 8,9...
- Switching element, 10... Polarity detection circuit, 11... Selection signal detection circuit, 12... Loop closure/data reception circuit, l3... Control same path, 14... Display circuit. Figure 3 b Figure 4

Claims (1)

[Claims] In a data transmission system for a multiple subscriber telephone line in which a plurality of telephones and data transmission terminal devices are connected to one line and a selection signal is used for calling, the exchange and the exchange line circuit are provided with data transmission processing means, and the data transmission terminal The device is provided with a selection signal receiving circuit, a loop closing circuit, and a data receiving circuit, the switching equipment selects the data transmission terminal device by sending a selection signal, and the data transmission terminal device transmits the data by closing the loop of the data transmission terminal device. A data transmission method for a multi-joint subscriber line, characterized in that upon termination, a call signal is sent from an exchange and a telephone rings.