JPH0683327B2 - Network control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a communication device for performing voice communication and data communication, and is a network control circuit that enables a telephone to be used locally for other purposes.

[Technology of the invention]

The conventional network control circuit has provided an interface function for switching the connection of a communication processing unit such as a telephone or a voice processing / modulation / demodulation device to a telephone line. FIG. 3 shows an example of a conventional network control circuit. First switching circuit for switching the connection between the telephone 35 and the communication processing unit for the telephone line
31, a second switching circuit 32 for switching the connection between the modem circuit and the basic control unit with respect to the telephone line.

[Problems to be solved by the invention]

In the above-mentioned conventional network control circuit, even if the telephone connected to the network control circuit has a numeric key of 0 to 9 and a symbol key of * and #, it cannot be used for inputting numeric data. It was

[Means for solving problems]

The network control circuit of the present invention is the first to switch the connection destination of the telephone.
Switching circuit, a current supply circuit for supplying a direct current for driving the telephone locally, a DTMF receiving circuit for receiving a DTMF (multi-frequency) signal from the telephone or a telephone line, and the DTMF receiving circuit And a second switching circuit for switching to the connection destination of.

〔Example〕

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

FIG. 2 shows a circuit block diagram of a general communication device including a network control circuit. The basic control unit 23 is composed of a CPU (microprocessor), an I / O controller circuit, and the like, and realizes the application function of the main device by software control. The modulation / demodulation circuit 22 and the telephone set 24 are the same as the circuits mounted in a general communication control device. Network control circuit 21
Is a circuit for controlling outgoing call and incoming call for the telephone line, and connection switching control for various communication processing units.

FIG. 1 shows a circuit block diagram of a part of a network control circuit according to the present invention. The first switching circuit 11 is a switching circuit for switching the connection destination of the telephone set 16 to the telephone line or the current supply circuit 13. The second switching circuit 14 is a circuit for switching the connection destination of the DTMF receiving circuit 15 to either the telephone line side or the local side. The current supply circuit 13 is a direct current supply circuit for driving the telephone 16 locally. Capacitor 12
Is a coupling capacitor, and the switch 17 is a dual-purpose switch for pulse dial output and on-hook dial.

〔The invention's effect〕

As described above, according to the present invention, the telephone can be used not only for voice communication using a telephone line but also for local use such as internal function setting of the network control device and speed dial registration, and an external telephone. Since the basic control unit can know the dial contents of, the redial contents can be managed by the basic control unit.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 2 shows a peripheral circuit block diagram of a network control circuit according to the present invention, and FIG. 3 shows an embodiment of a conventional network control circuit. 11 …… First switching circuit, 12 …… Coupling capacitor, 17 …… Switch, 18 …… Transformer.

Claims (1)

[Claims] 1. A current supply circuit for supplying a direct current for driving a telephone locally, and a telephone provided between the telephone and the current supply circuit and a telephone line. A first switching circuit for switching and connecting to one of the telephone line side, a multi-frequency signal receiving circuit for receiving a multi-frequency signal from the telephone or the telephone line, and the first switching circuit The terminal on the side of the current supply circuit, the multi-frequency signal receiving circuit, and the telephone line, the multi-frequency signal receiving circuit, the terminal on the side of the current supply circuit in the first switching circuit,
A network control circuit having a second switching circuit for switching and connecting to one of the telephone line sides.