JPS6336646A - Expanded network control circuit - Google Patents

Abstract

PURPOSE:To attain miniaturization of a master equipment and to reduce the cost by connecting the master equipment by means of telephone and control lines so as to eliminate the need for a connection for the connection of expanded communication equipment to the master equipment. CONSTITUTION:A control line 50 connects a basic control circuit 1 of a master equipment 10 and a control circuit 5 of an expanded control circuit 20 and a telephone line 60 connects a network control circuit 3 of the equipment 10 and a switch circuit 7-0 of the circuit 20. The circuit 5 applies ON/OFF control of circuits 7-0-7-N and a current supply/call tone generating circuit 6 programmably by the command from the circuit 1, and communication equipments 9-1-9-N making communication are connected to a telephone line 40 via a telephone line 31. The connection on/off of the equipments 9-1-9-N is detected by corresponding current detection circuits 8-1-8-N and sent to the circuit 1 via the circuit 5. Thus, plural communications are coped with the circuit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device, and more particularly to expansion of a network control circuit of a communication device for a plurality of different communication methods.

[Conventional technology]

Conventionally, in a composite communication system that realizes multiple communications by switching the connection of an expansion communication device or expansion communication unit that shares multiple communication functions to a single telephone line depending on the content of communication, a network control circuit is used. In order to enable multiple communications, the main device either had a built-in communication unit corresponding to each type, or provided an interface for connecting the corresponding communication devices.

[Problem that the invention seeks to solve]

When the above-mentioned conventional network control circuit is expanded to enable multi-number communications, a switching circuit and its control circuit corresponding to the communication section or communication device are required, and in the case of a communication device, it is necessary to connect them. It is necessary to permanently install a connector etc. on the main device for this purpose, which has the drawback of increasing the size of the main device and increasing the price.

The purpose of the present invention is to avoid complicating the configuration of the main device.
The object of the present invention is to provide an extended network control circuit that can eliminate the above-mentioned drawbacks.

[Means for solving problems]

The present invention is an extended network control circuit in a composite communication system that realizes multiple communications by switching the connection of extended communication devices that share multiple communication functions to a single telephone line depending on the content of the communication. a plurality of switch circuits for switching connections of the plurality of communication devices to one telephone line; and controlling on/off of the plurality of switch circuits according to instructions from a main device in the composite communication system. The device is characterized in that it has a control circuit and is connected to the main device through a telephone line and a control line.

〔Example〕

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

FIG. 1 is a block diagram showing one embodiment of the present invention.

The main device 10 is composed of a basic control circuit 1, a modem circuit 2, and a network control circuit (NCU) 3.
is connected. The basic control circuit 1 is composed of a CPU (microprocessor), an I10 controller circuit, etc., and realizes the ablication function of the main device under software control. The basic control circuit 1 has an address bus, a data bus, and an I/O bus that are part of the system bus in the basic control circuit.
It has an extended I10 hash interface for releasing a part of the I10 read/write signal to the outside as extended input/output. Note that the modulation/demodulation circuit 2 and the network control circuit 3 are the same as general ones.

The extended network control circuit 20 includes a control circuit (auxiliary NCU control circuit) 5, a current supply/ringing tone generation circuit 6, and a switch circuit (SW). -0.7-1. ....

? -N, and current detection circuit (CD) 8-0. 8-1°・
..., 8-N. The control circuit 5, under instructions from the basic control circuit 1, operates the current supply/ringing tone generation circuit 6 and the switch circuits 7-0 to 7-0. -N and current detection circuits 8-0 to B-H, and transmits output information of the current detection circuit to the basic control circuit l. The current supply/ringing tone generation circuit 6 is a circuit that locally supplies direct current and generates a ringing tone signal to a telephone or the like. The switch circuits 7-0 to 7-N are connected to communication devices 9-0.9- such as general facsimile communication devices and voice response devices.
1. . . , 9-N, and an example of this switch circuit is shown in FIG. This switch circuit consists of two changeover switches 21.2
2, the terminals a of these changeover switches are connected to the telephone line line of the previous stage, and the terminals b of these switches are connected to the current supply line of the previous stage. Terminals al and b+ are connected to the next stage switch circuit, and terminals a'' and b'' are connected to the corresponding communication device.

FIG. 3 shows the connection state of the switch circuits 7-0 to 7-N. These switch circuits are connected in series by a telephone i-line 31 and a current supply line 32, and the current supply line of the switch circuit 7-N is connected to the current supply/ringing tone generating circuit 6.

The current detection circuits 8-0 to 8-N are connected to each communication device 9-O to 9.
This is a circuit that detects connection on/off of each communication device by detecting the current of the connection line to -N. FIG. 4 shows an example of the circuit. This current detection circuit is composed of two photocoupler elements 41 and 42, terminal C is connected to the switch circuit, terminal d is connected to the communication device, and terminals e' and e'' are connected to the control circuit 5. When a current flows through the light emitting diode of the coupler element, the output of the phototransistor is input to the control circuit 5 from the terminals e l and e #.

Now, the main device 10 and the expansion network control circuit 20 configured as described above are connected by a control line 50 and a telephone line 60, which are expansion input/output buses. control line 50
is the basic control circuit 1 of the main device 10 and the extended network control circuit 20.
The telephone line line 60 connects the network control circuit 3 of the main device IO and the terminals al and bl (see FIG. 2) of the switch circuit 7-0 of the extended network control circuit 20. .

According to this embodiment, the control circuit 5 performs programmable on/off control of the switch circuits 7-0 to 7N and the current supply/ringing tone generation circuit 6 based on instructions from the basic control circuit 1 of the main device 10. As a result, the communication device with which communication is to be performed is connected to the telephone line 40 via the telephone line 31. The connection on/off of the communication device to the telephone line is detected by the corresponding current detection circuit, and is transmitted to the basic control circuit 1 of the main device 10 via the control circuit 5.

As described above, according to this embodiment, it is possible to handle multiple communications using the extended network control circuit. In this embodiment, a case has been described in which a communication device is connected as an external device to the extended network control circuit, but even if these communication devices are built into the extended network control circuit as a communication function section, this does not apply to this embodiment. The invention is applicable.

〔Effect of the invention〕

As explained above, according to the extended network control circuit of the present invention, there is no need to provide the main device with a connector for connecting the extended communication device, and the main device itself can have a simple configuration. The main device can be made smaller and less expensive. Further, the extended I/○ bus interface is a normal interface that can be used for other purposes, and does not require any special interface. Furthermore, the scale change by the extended network control circuit of the present invention has the advantage that it does not affect the hardware of the main device.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing an example of a switch circuit, FIG. 3 is a diagram showing a connection state of a plurality of switch circuits, and FIG. 4 is a diagram showing an example of a switch circuit. FIG. 3 is a diagram showing an example of a current detection circuit. 1...Basic control circuit 2...Modulation/demodulation circuit 3...Network control circuit 4...Telephone 5...Control circuit 6...Current supply/ Ringing tone generation circuit 7-0 to 7-
N...Switch circuit 8-0 to 8-N...Current detection surface 1 Raku 9-0 to 9-N...Communication device 10...Main device 20...Extended network control Circuit 40...Telephone line 50...Control line 60...Telephone line line

Claims (1)

[Claims] (1) An extended network control circuit in a composite communication system that realizes multiple communications by switching the connection of extended communication devices that share multiple communication functions to a single telephone line depending on the content of the communication. , a plurality of switch circuits for switching connections of a plurality of communication devices to one telephone line, and control for controlling on/off of the plurality of switch circuits according to instructions from a main device in a composite communication system. 1. An extended network control circuit comprising a circuit, and connected to the main device via a telephone line and a control line.