JPH0265341A - Digital electronic exchange - Google Patents

Abstract

PURPOSE:To execute data communication with MODEM pool function even in the case of an opposite party to which a responding signal is not sent by executing the reception processing of the responding signal with a MODEM interface trunk when an outgoing destination telephone number is a telephone number stored in a number memory. CONSTITUTION:When origination is executed to a data terminal 10 by a data terminal 1 and the number of the data terminal 10 is set to a number memory 11, a central control unit 4 outputs instruction that there is a response to a MODEM interface trunk 6. When the number of the data terminal 20 is not set to the number memory 11, the data terminal 10 has a number, with which the responding signal is sent through a public network 8 to an analog line trunk 5. Accordingly, after the analog link trunk 5 detects the responding signal from the public network 8, the central control unit 4 sends the instruction that there is the response to the MODEM interface trunk 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stored program exchange type digital electronic exchange, and more particularly to a digital electronic exchange equipped with a modem Boolean function as a common device.

[Conventional technology] Digital electronic exchanges using the stored program exchange method:
Some systems have a modem boolean function that allows modems to be centrally installed and shared by each data terminal or terminal device through a time division switch.

FIG. 2 is a block diagram of a conventional digital electronic exchange that performs data communication between offices using analog lines.

In the figure, l is a data terminal equipment (DTE (A)),
2 is a data terminal interface device (DM), aCf
M min vJ] ('tch (TSW), 4 is the central control unit (C
C). In addition, 5 is an analog line trunk (COT).
), 6 is a modem interface trunk (MDT),
7 is a modem (MDM (A) ”), and 8
is the public network (PSTN), 9 is the opposing modem (MDM (B)
)), IO is a data terminal equipment (DTE (B)).

In the digital electronic exchange having the above configuration, a modem interface trunk 6 is housed in the exchange in order to use the modem 7 as a common device in the exchange system. In order to connect the data terminal head a1 and the modem 7 via the data terminal interface device 2, the data terminal head a1 and the modem 7 are connected via the time division switch 3 and the modem interface trunk 6.

The modem 7 also performs digital/analog exchange,
Analog line trunk 5 again through time division switch 3
is connected to. Then, the analog line trunk δ is connected to the opposing modem 9 via the public network 8, and as a result, data communication is performed between the data terminal equipment 1 and the data terminal equipment IO.

However, when the data terminal 1 makes a call to the data terminal 10, the data terminal 10 sends @
Suppose it is a line. Then, even if the data terminal device IO responds, the public network 8 does not send a response signal to the analog trunk 5. Therefore, the central side '1IHa4 does not issue an instruction to the modem interface 6 that there is a response, assuming that the data terminal l is still calling the data terminal 10.

As a result, the modem interface 6 cannot turn on the ER (terminal ready signal) to the modem 7, so carrier signals are not transmitted and received between the modem 7 and the opposite modem 9, and data communication is not possible.

[Problems to be Solved] The above-mentioned conventional digital electronic exchange has the problem that if the opposite data terminal is on a line for incoming call charges, etc., no response signal is sent from the public network, making data communication impossible. Ta.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a digital electronic exchange capable of performing data communication using a modem boolean function even with a party to which no response signal is sent.

[Means for Solving Problems] In order to achieve the above object, the digital electronic exchange of the present invention includes a modem, a modem interface trunk accommodating the modem, an analog trunk accommodating an analog line, and a plurality of data terminal interfaces. , a time division switch that connects the analog trunk to the modem interface trunk and the data terminal interface to the modem interface trunk in a time division manner, and a number memory that stores the telephone number of the subscriber to the game to which no response signal is sent. and a telephone number setting means for setting a telephone number in this number memory, and controlling the above-mentioned time division switch and modem interface trunk, and when the destination telephone number is the telephone number stored in the above number memory, The modem interface trunk is equipped with a central device for receiving and processing response signals.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram of a digital electronic exchange according to an embodiment of the present invention. Note that parts common to or corresponding to those of the conventional example are denoted by the same reference numerals.

In the figure, 11 is a number memory, 12 is a terminal device (MAT) that sets a number in the number memory 11, and the data terminal IO line is connected to a public network 8 for incoming call charges, etc.
The analog line trunk 5 is a line from which no response signal is sent.

Therefore, it is assumed that the number of the data terminal 10 is set in the number memory 11 via the central control device 4 by the operation of the terminal device a12.

In the above configuration, when the data terminal 1 makes a call to the data terminal 10, the central control unit 4 checks whether the number of the data terminal 10 is stored in the number memory 11. As mentioned above, the number of the data terminal 10 is set in the number memory 11 in advance. Therefore, the central control device 4 confirms that the number of the data terminal 10 is set in the number memory 11, and issues an instruction to the modem interface trunk 6 that there is a response.

Then, upon receiving this instruction, the modem interface trunk 6 turns the modem 7 ER"ON and waits for a carrier signal from the partner modem 9.

On the other hand, the analog line trunk 5 receives a call from the data terminal 10 via the public network 8 in a normal outgoing operation. Then, the data terminal 10 responds and sends an ER message to the other party's modem 9.
Set it to “ON”. As a result, modem 9. Carrier signals are transmitted and received at leap 7, making data communication possible.

On the other hand, if the number of the data terminal 10 is not set in the number memory 11, the data terminal IO is the number to which a response signal is sent to the analog line trunk 5 via the public network 8. Therefore, after the analog line trunk 5 detects a response signal from the public Tl 48, the central controller 4 sends an indication to the modem interface trunk 6 that there is a response.

As described above, in this embodiment, the central control unit of the digital electronic exchange has a number memory for storing telephone numbers for which no response signal is sent, and means for setting telephone numbers in the number memory.

That is, the central control unit is provided with a number memory for storing telephone numbers for which no response signal is sent from the opponent station to notify that the subscriber of the opponent station has responded, and is also provided with means for setting the telephone number in this number memory. The modem interface trunk that interfaces the modem can be activated even if the modem is not sent out.

Note that the present invention is not limited to the above-mentioned embodiment, but includes various modifications of the gist of @pronation.0For example, in the above-mentioned embodiment, the number is set from the terminal device 12, but the central It is also possible to provide the control device 4 with a learning function and store the number in the number memory 11 when data communication fails.

[Effects of the Invention] As described above, the present invention has the advantage of providing a digital electronic exchange that can perform data communication using the modem Boolean function even with a partner to which no response signal is sent.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a digital electronic exchange according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional digital electronic exchange. 2: Data terminal interface Ha 3: Time division switch 4: Central control unit 5: Analog line trunk 6: Modem interface trunk 7: Modem ll: Number memory 12: Terminal device

Claims (1)

[Claims] a modem, a modem interface trunk accommodating the modem, an analog trunk accommodating an analog line, a plurality of data terminal interfaces, a connection between the analog trunk and the modem interface trunk, and a connection between the data terminal interface and the modem interface trunk. a time division switch for time division connection; a number memory for storing the telephone number of a subscriber to whom no response signal is sent; a telephone number setting means for setting a telephone number in the number memory; The present invention is characterized by comprising a central control unit that controls the modem interface trunk and causes the modem interface trunk to receive a response signal when the destination telephone number is a telephone number stored in the number memory. Digital electronic switching equipment.