JPH0691679B2 - Transmission path determination method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transmission line determination method for outgoing connection in a storage program type electronic exchange.

[Conventional technology]

Conventionally, this type of transmission path determination method uses digital lines to transmit digital data in digital transmission, and analog transmission uses analog lines to transmit analog data (data modulated by a modem). The transmission line is used by being completely separated and fixed to either a digital line or an analog line.

[Problems to be solved by the invention]

The transmission path determination method in the conventional electronic exchange described above is
The transmission path has been set in advance depending on whether the transmission data from the accommodated terminal is analog data or digital data. On the other hand, since the number of analog lines and the number of digital lines are preset for the inter-office line accommodated in the electronic exchange, for example, when trying to transmit analog data (data modulated by a modem), the digital line is not available. Even then, I could not send this analog data using the digital line and had to wait until the analog line became available. In addition, the opposite situation occurred. As a result, there is a problem that the line between stations cannot be used effectively.

[Means for solving problems]

The transmission path determination method of the present invention has a storage device and an input / output device in the central control unit of an electronic exchange, and the transmission method from the input / output device to the storage device in advance to the station is digital transmission or analog transmission corresponding to the station number. If the dialed station number corresponds to digital transmission, select the digital line when the call is sent from the station, and select this digital line Select the analog line if the line is busy, or select the analog line if the station number supports analog transmission. If the analog line is busy, select the digital line. Line selection Means are provided for the central controller.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a relay system diagram of an embodiment of the present invention. In FIG. 1, a and b are data terminals, c is a data terminal interface circuit, d is a switch, e is a modem interface circuit, f is a modem, g is a digital line interface circuit, h is a digital line, and i is an analog line interface. A circuit, j is an analog line, k is an input / output device, l is a central controller, and m is a storage device.

FIG. 2 is a circuit network diagram of an embodiment of the present invention.
In FIG. 2, n and q are analog lines and o and p are digital lines.

First, in FIG. 2, when there is a call from the station A, information about the transmission method of analog transmission and digital transmission corresponding to the station number is set in the storage device m from the input / output device k in FIG. 1 in advance. It is set that the transmission method to the station C is digital transmission and the transmission method to the station D is analog transmission. Now, when there is a call from the data terminal (that is, the subscriber terminal) a to the station C, the central control unit 1 reads the transmission path information corresponding to the station number of the station C in the storage device m. In this case, since the transmission method to the station C is digital transmission, the central control unit 1 operates to select the digital interface circuit g.
If the digital interface circuit g can be selected, the switch d is controlled. If all the digital lines h are in use, the data terminal (that is, the subscriber terminal) b
As described above, the central control unit 1 selects the modem interface circuit e, selects the analog interface circuit i via the modem f, and controls the switch d.

Similarly, when there is a call from the station A to the station D, the central control unit 1 reads the transmission line information corresponding to the station number from the storage device m. In this case, since the transmission system to the station D is analog transmission, the central control unit 1 controls the analog interface circuit i.
To select. If this analog interface circuit i is selectable, analog transmission is performed via the modem f as in the case of the data terminal b. If analog line j
If all are in use, the central controller 1 selects the digital interface circuit g and transmits the data modulated by the modem f via the digital line h. Here, the order of selection of the digital line h and the analog line j is determined by the route advance means of the central controller 1.

〔The invention's effect〕

As described above, according to the present invention, the information of the transmission method of digital transmission or analog transmission corresponding to the station number is set in the storage device in the electronic exchange, and the digital line and analog line selection means is provided in the central control unit. This has the effect of enabling effective use of analog and digital lines between stations.

[Brief description of drawings]

FIG. 1 is a relay system diagram of an embodiment of the present invention, and FIG. 2 is a circuit network diagram of an embodiment of the present invention. a, b ... Data terminal (subscriber terminal), c ... Data terminal interface circuit, d ... Switch, e ... Modem interface circuit, f ... Modem, g ... Digital line interface circuit, h ... Digital Line, i ... Analog line interface circuit, j ... Analog line, k
...... Input / output device, l ... Central control unit, m ... Storage device, n, q ... Analog line, o, p ... Digital line, A, B,
C, D …… Station.

Claims (1)

[Claims] 1. A central control unit of an electronic exchange has a storage device and an input / output device, and information from the input / output device is set in advance in the storage device whether the transmission method to the station is analog transmission or digital transmission corresponding to the station number. In advance, when making a call from a station, select the line between stations if the dialed station number corresponds to digital transmission, then select the digital line,
If the digital line is busy, select the analog line. If the station number supports analog transmission, select the analog line. If the analog line is busy, select the digital line. A transmission path determination method, characterized in that a central device is provided with a line selection means for selecting.