JPS6192065A - Data switching system - Google Patents

Abstract

PURPOSE:To perform efficient data switching by using a MODEM and a MO DEM trunk whose data transfer speed can be switched. CONSTITUTION:Data transfer speeds different from each other of digital terminal equipments 1 and 2 are stored in a central controller 8. The MODEM adapted to plural kinds of data transfer speed is provided as a MODEM11, and a MO DEM trunk 7 is provided with a switching circuit 7a which controls switching of the data transfer speed in accordance with control information from the central controller 8. The central controller 8 reads out the data transfer speed by the transmission request from the terminal equipment 1 and sends information of this data transfer speed to the MODEM trunk 7 and sends connection control information to a digital line circuit 3, a time division switch 4, the MODEM trunk 7, and a central office line trunk 5 to perform the connection processing between the digital terminal equipment 1 and a trunk line. The MODEM trunk 7 controls the internal switching circuit 7a in accordance with information of the data transfer speed from the central controller 8 and designates the data transfer speed to the MODEM11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data exchange system. In particular, it relates to a data exchange system that allows devices with different data transfer rates to be connected.

[Conventional technology]

Conventionally, when transmitting and receiving data by connecting a digital terminal device and a modem to a modem, and between a modem and a central office line trunk via a digital switch, data was transferred via a digital line circuit to the digital switch. A modem corresponding to the data transfer rate of the digital terminal device to be used is accommodated in a digital exchange via a modem trunk corresponding to the data transfer rate, and the data transfer rate can be adjusted from multiple digital terminal devices and a plurality of modems. They selected a device, connected it, and exchanged data.

FIG. 2 is a block diagram showing a conventional data exchange system. In the figure, the combinations of digital terminal equipment and modulation/demodulation equipment connected to the office line trunk 5 include a digital terminal equipment 1 and a modulation/demodulation equipment 9, and a digital terminal equipment 2 and a modulation/demodulation equipment 10, which have the same data transfer rate. The digital exchange 12 includes a digital line circuit 3, a time division switch 4, a modem trunk 6, a central office trunk 5,
It consists of a central control device 8.

The data transfer rate is 60% by the connection control of the central controller 8.
A digital terminal device l of 0 BPS is connected to a modem 9 having a data transfer rate of 600 BPS via a line circuit 3, a time division switch 4, and a modem trunk 6.
, are connected to the central office line via the central office line trunk 5. Similarly, the data transfer rate is 12 by the connection control of the central controller 8.
The digital terminal device 2 with a data transfer rate of 12008 PS is connected via a line circuit 3, a time division switch 4, and a modem trunk 6 to a modem 1o with a data transfer rate of 12008 PS. The modem 10 transmits data by being connected to a central office line via a modem trunk 6, a time division switch 4, and a central office line trunk 5, respectively.

[Problem that the invention seeks to solve]

In this way, with conventional equipment, it is basically impossible to connect digital terminal devices and modems with different data transfer speeds. It was very inefficient because it required the same number of speeds.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and it is an object of the present invention to provide a data exchange system that is efficient in the use of a modem trunk and a modem.

[Means for solving problems]

The present invention stores in advance the data transfer rate of a digital terminal device accommodated in a digital exchange via a digital line circuit in a central control unit, and uses a modem device capable of supporting a plurality of data transfer rates as a modem device,
The present invention is characterized in that a plurality of digital terminal devices having different data transfer rates can be connected to one modem device under control from a central control device.

That is, the present invention provides a data exchange system in which data is exchanged between a digital terminal device and a modem and between a modem and a central office line trunk via a digital exchange, in which the modem is compatible with a plurality of data transfer rates. It is equipped with a modem function, and the central control unit is equipped with means for storing the data transfer rate of each digital terminal device,
It is characterized in that the digital terminal device and the central office line are connected based on data transfer rate information from the central control device.

[Effect]

The present invention stores the transfer speeds of digital terminal devices having different transfer speeds in advance in a central control unit, etc., and connects each of the above terminal devices to an independent modem. improve usage efficiency.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of an embodiment of a data exchange system according to the present invention. The outputs of the digital terminal devices 1 and 2 are input to the time division switch 4 via one and the other digital line circuits 3, respectively. One output of the time division switch 4 is connected to the office line via the office line trunk 5. The other output is input via a modem trunk 7 (incorporating a switching circuit 7a) to a modem 11 that supports multiple data transfer rates. A central controller 8 is coupled to the other digital line circuit 3, the time division switch 4 and the modem trunk 7. The digital exchange [12] includes a digital line circuit 3, a time division switch 4, a modem trunk 7, a central office trunk 5, and a central control unit 8. The different data transfer speeds of the digital terminal devices 1 and 2 are stored in advance in the central control device 8. Furthermore, the modem 11 is equipped with a modem that can support a plurality of data transfer rates, and the modem trunk 7 is equipped with a switching circuit 7a that controls switching of data transfer rates based on control information from the central controller 8. It is.

In response to a call request from the digital terminal device, the central controller 8 reads out the data transfer rate stored in advance and transfers this data transfer rate information to the modem trunk 7.
In addition, connection control information is transmitted to the digital line circuit 3, time division switch 4, modem trunk 7, central office trunk 5.
Connection processing between the re-digital terminal device 1 and the central office line is performed. The modem trunk 7 controls an internal switching circuit 7a based on the data transfer rate information from the central controller 8, and also specifies the data transfer rate to the modem 11.

[Effects of the Invention] As described above, the present invention can provide an efficient data exchange system by using a modem and a modem trunk capable of switching data transfer rates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the data exchange system of the present invention. FIG. 2 is a block diagram showing a conventional data exchange system. 1...Digital terminal device (data transfer rate 600B)
PS), 2... Digital terminal equipment (data transfer rate 12008 PS), 3... Digital line circuit, 4... Time division switch, 5... Office line trunk, 6... Modulation/demodulation equipment trunk , 7... Modem trunk, 7a... Switching circuit, 8... Central controller,
9...Modulator/demodulator (data transfer rate 600BPS),
10...Modulator/demodulator (data transfer rate 1200B P
S), 11...Modulator/demodulator (compatible with multiple data transfer rates), 12...Digital exchange.

Claims (1)

[Claims] (1) In a data exchange system in which a digital terminal device and a modem are connected via a digital switch, and a modem and a central office line trunk are connected to exchange data, the modem has a plurality of data transfers. A central control unit of the digital exchange includes means for storing the data transfer rate for each digital terminal device, and a means for storing the data transfer rate for each digital terminal device, and a means for controlling the digital terminal device and the central office line based on the information on the data transfer rate. A data exchange method characterized by comprising a means for connecting.