JPH04284046A - Modem control system for automatic exchange - Google Patents

Abstract

PURPOSE:To unnecessitate a switch for setting a MODEM control process and to automate the set of the control process by successively executing the registered MODEM control processes at a MODEM device until the MODEM device enables communication. CONSTITUTION:When data communication is requested from a data terminal 10, a central processing unit 26 activates (100) a MODEM trunk 30. When the activation is received, the MODEM trunk 30 executes (102). the registered MO DEM control processes to a faced MODEM 50 by a MODEM control means. When the MODEM control process suitable for the connected MODEM 50 is selected, the MODEM trunk 30 transmits data communication enable information to the central processing unit 26 and executes MODEM pool connection.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem control method used in a modem pool function in an automatic switchboard, and particularly in a digital switchboard.

0002

2. Description of the Related Art For example, in a private branch exchange accommodating a plurality of data terminals, it is desirable to use modems efficiently when performing data communications. For this reason, so that the modem can be shared by each data terminal accommodated in the extension,
A modem pool function is used that allows connection to opposing modems via modem trunks. When a data terminal performs data communication, it is necessary to select a modem that is compatible with the modem connected to the data terminal performing data communication. Therefore, when multiple types of modems are pooled, there are modem control procedure processes depending on the type, and an appropriate process is selected from among them. FIG. 4 shows a processing flow of a modem pool connection operation according to the prior art. Conventional modem pool connection processing will be explained using the same figure.

When a modem pool connection request is made from a data terminal, the central processing unit of the private branch exchange selects and supplements a vacant modem trunk, activates this modem trunk, and instructs the modem to be controlled. The modem trunk needs to be controlled according to the modem device connected to it. For this reason, a switch is changed within the modem trunk depending on the accessed data terminal, and the modem is controlled according to a predetermined control procedure for each data terminal. That is, for example, if the data terminal is in modem control procedure 2, the processing in modem control procedure 2 is executed by switching a switch in the modem trunk. When the modem is ready for data communication,
Based on the notification from the modem trunk, the central processing unit connects the central office line trunk and the modem trunk. Thereby, a data terminal accommodated in the extension line can perform data communication with a data terminal connected to, for example, a public network via the modem.

0004

[Problem to be solved by the invention] In recent years, with the spread of data communications, modems have become faster and more sophisticated.
Data communication has come to be carried out using many types of modems. When many types of modems are pooled, the control contents and control procedures for the modems will vary accordingly. Conventionally, switches were installed in the modem trunk according to the number of controls to accommodate each procedure. I was doing it. However, with such conventional technology, as the number of modem control procedures increases, there are many problems in which the switch settings of the connected modem and the modem trunk do not match, and as a result, data communication is not possible and modem pool connection is not possible. There was a problem. Further, it is troublesome to set in advance the modem control means corresponding to each data terminal according to the type of modem.

[0005] The present invention solves the problem that data communication cannot be performed using a modem pool connection because the setting of the switch that specifies the modem control procedure of the modem trunk does not match the control procedure of the actually connected modem. The purpose of this invention is to provide a modem control method for automatic switching equipment that can eliminate the

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a modem control method in an automatic switching system in which modem devices in a modem pool in the automatic switching system are accessed via a modem trunk. The modem procedure control means has a modem procedure control means in which a plurality of modem control procedures for controlling the device are registered, and when the modem procedure control means receives an instruction to start the modem device, the modem procedure control means is registered in sequence until the modem device becomes able to communicate. Execute modem control procedures on the modem device.

[0007]

According to the present invention, when a data communication request is made from a data terminal, the central processing unit activates the modem trunk. When the modem trunk receives this activation, it sequentially performs the modem control procedure processing registered by the modem procedure control means on the opposing modem. Then, when a modem control procedure suitable for the connected modem is selected, the modem trunk sends data communication enable information to the central processing unit to establish a modem pool connection.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a modem control system in an automatic switching system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the present invention in a digital private branch exchange 2.
A system configuration diagram illustrating modem pool connections when applied to 0 is shown. In the figure, data terminal 10
is a computer with a data communication function, such as a personal computer or workstation. That is, data terminal 1
0 is a data terminal 72 connected to a public network 60, etc.
It has the function of data communication with. Data terminal 1
0 is connected to a digital exchange 20 via a data terminal interface device 22.

The data terminal interface device 22 is a device that interfaces the exchange 20 and the data terminal 10, and the data terminal interface device 22 is a device that interfaces the exchange 20 and the data terminal 10.
6. Under the control of the central processing unit 26, the digital switch 24 connects the data terminal interface device 22, the central office line (CO) trunk 28, and the modem trunk 3.
This is a switch that connects between 0 and 0. The central processing unit 26 is
This is a control device that controls each component of the digital exchange 20 using stored programs. Central processing unit 2
6 is connected to a digital switch 24, a central office line trunk 28, and a modem trunk 30, and performs switching control by controlling these. The office line trunk 28 is a trunk that performs connection processing between the digital exchange 20 and the public network 60 under the control of the central processing unit 26.

The modem trunk 30 connects the modem device 50 for the modem pool and the digital switch 24, and controls the modem device 50 according to instructions from the central processing unit 26. The modem trunk 30 is provided as a pair with a modem device 50. The modem device 50 is a modem that is used in a modem pool and is capable of handling, for example, a plurality of modem control procedures. The modem device 50 is shared by each data terminal 10 housed in the exchange 20 via the modem trunk 30.

FIG. 1 shows a functional block diagram of a modem trunk 30 in this embodiment. The modem trunk 30 will be explained using the figure. A terminal A1 connected to the digital switch 24 is connected to a digital switch interface circuit section 32. The digital switch interface circuit unit 32 is a circuit that matches the interface with the digital switch 24.
relays data and control signals from The digital switch interface circuit section 32 is the D/A conversion circuit section 3
4 and the data conversion section 38.

[0013] The D/A conversion circuit section 34 is connected to a modem device 50.
When the modem analog signal is received from (Figure 2), this signal is converted to a digital signal and the digital switch 24
This is a circuit that transmits data to. Furthermore, when a signal sent from the modem 70 via the public network 60 is input as a digital signal to the switch 24 via the central office line trunk, the conversion circuit unit 34 converts this digital signal into an analog signal and sends it to the modem device 50. It has the function of transmitting. The D/A conversion circuit section 34 is connected to a modem analog interface circuit section 36. Modem analog interface circuit section 36
is a circuit section that interfaces the modem analog signal, and connects the modem 50 analog terminal (
(not shown).

The data converter 38 is a converter that converts a data signal from the data terminal 10 into a signal to be sent to and received by the modem device 50. The data converter 38 is connected to a modem digital interface circuit 40. The modem digital interface circuit section 40 is a circuit section that provides an interface for modem digital signals, and is connected to a digital terminal (not shown) of the modem device 50 via a terminal B2.

Terminal A2 connected to the central processing unit 26 is connected to a central processing unit interface circuit section 42. The central processing unit interface circuit unit 42 is a circuit that interfaces with the central processing unit 26, and receives and relays future control signals. Interface circuit section 42
is connected to the modem procedure control unit 44, and is connected to the central processing unit 2.
The control signal received from 6 is sent to modem procedure control section 44. When the interface circuit section 42 also receives a signal indicating that data communication is possible from the modem procedure control section 44, it notifies the central processing unit 26 of this.

The modem procedure control section 44 controls the central processing unit 2.
This is a control unit that executes various control procedures for the modem 50 in accordance with the activation instruction of 6. FIG. 3 shows an example of the modem control procedure in this embodiment. The operation of this embodiment will be explained using FIG. 1, FIG. 1, and FIG.

When data terminal 10 makes a request for connection to the modem pool, this request is sent to central processing unit 26 via data terminal interface device 22. When the central processing unit 26 recognizes that the data terminal 10 is making a connection request to the modem pool, the central processing unit 26 selects and supplements a vacant modem trunk 30 from among the plurality of modem trunks 30, and activates the modem trunk 30. (100). In the modem trunk 30, this activation signal is sent to the central processing interface circuit section 4 via the terminal A2.
2 and transmits it to the modem procedure control section 44. Upon this activation, the modem procedure control section 44 first sends a control signal for modem control procedure 1 to the modem device 50 via the modem digital interface circuit section 40 - terminal B2 (
102). At the same time, it waits to receive a data communication enable signal or a response signal to the control procedure from the modem device 50 (104).

If the communication enable signal cannot be received from the modem device 50 within a predetermined time (104), the next modem control procedure 2 is sent to the modem device 50 as a timeout (108, 110). Also, when a disapproval response signal to the transmitted control procedure is received from the modem device 50 (106), the next modem control procedure 2 is transmitted to the modem device 50.
0 (110). Similarly, the registered modem control procedures are sequentially executed until data communication with the modem device 50 becomes possible. Then, when the modem procedure control section 44 receives a data communication enable signal from the modem device 50 via the modem digital interface circuit section 40, (1)
12) Notify the central processing unit 26 via the central processing unit interface circuit unit 42 that data communication is possible (114).

In this embodiment, the present invention is applied to a digital private branch exchange having a digital switch, but it can also be applied to an automatic exchange having an analog switch. Further, in this embodiment, a configuration in which one modem trunk 30 and one modem device 50 are each shown is shown, but this is to facilitate understanding of this embodiment, and the number of modem trunks 30 and modem devices 50 is Of course, it is not limited to this.

[0020]

[Effects of the Invention] According to the present invention, there is no need for a switch for specifying modem procedure control in a modem trunk connected oppositely to a modem device, and data communication in a modem pool connection due to incorrect switch settings can be prevented. The problem of not being able to do it disappears. According to the present invention, even if a new modem control procedure is added, it can be handled by software, for example, and therefore has high versatility.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing an embodiment of a modem trunk to which a modem control method in a digital exchange according to the present invention is applied.

FIG. 2 is a relay system diagram showing an embodiment of a digital exchange to which a modem control method in a digital exchange according to the present invention is applied.

FIG. 3 is an operational flow showing processing of the modem trunk shown in FIG. 1;

FIG. 4 is an operational flow illustrating modem trunk processing in the prior art.

[Explanation of symbols]

10 Data terminal 20 Digital private branch exchange 22 Data terminal interface device 24
Digital switch 26 Central processing unit 28 Office line trunk 30 Modem trunk 32 Digital switch interface circuit section 3
4 D/A conversion circuit section 36 Modem analog interface circuit section 38
Data conversion section 40 Modem digital interface circuit section 42
Central processing unit interface circuit section 44
Modem procedure control unit 50 Modem device

Claims (1)

[Claims] 1. A modem control method in an automatic exchange in which a modem device pooled in the automatic exchange is accessed via a modem trunk, wherein the automatic exchange has a modem control method registered with a plurality of modem control procedures for controlling the modem device. The modem procedure control means is configured to sequentially execute registered modem control procedures on the modem device until the modem device becomes capable of communication upon receiving an instruction to start the modem device. A modem control method for automatic switching equipment characterized by: