JPS59135964A - Network controller - Google Patents

Abstract

PURPOSE:To attain the network control with low noise and simple constitution where no calling bell rings at a case of automatic receicing and calling is performed as conventionally by switching a telephone set between a line and an off- hook detecting means. CONSTITUTION:When a switch 8 is connected to a line 2 and a switch 10 is switched to a line 12, a CI detecting circuit 200 only detects a calling signal. When a handset is hooked off, a switch 21 is turned on, an off-detecting signal is transmitted to a central controller 100, and when off-hook is detected, a telephone set 7 is connected to a line 1, and the switch 8 is switched to a facsimile device at a line 3 or succeeding lines by manual outgoing and a picture is transmitted and restored to an original loop when a transmission is finished. On the other hand, when a call signal is transmitted, a transistor 39 is turned on and the signal is transmitted to the device 100 and no calling bell rings. Then, the switch 8 is switched to the line 3 by the automatic incoming operation, the picture is transmitted and when the transmission is finished, the system is restored.

Description

[Detailed description of the invention] Technical field The present invention provides a network control device, particularly a paging signal.

Prior Art Conventionally, this type of network control device has been used for line control of facsimile machines and the like.

FIG. 1 shows a circuit diagram of a conventional network control device. In FIG. 1, reference numeral 1 indicates a telephone line, which is switched between two lines by a two-circuit switch 8 constituted by a relay or the like.

The contact on one side of the switch 8 is connected to the telephone jj via the signal vA2.
j&7 and a calling signal detection circuit (hereinafter referred to as CI detection circuit) 20 are connected, and this CI detection circuit 2
The output signal line 6 of 0 is led to a central controller 100 .

A signal line 3 is connected to the other side of the switch 8, and a modem of a facsimile machine, etc., which is also connected, is connected to the subsequent stage of the signal line 3.

This switch 8 is switched by driving each lens by a control circuit 30 via a signal line 4, but the drive control by this control circuit 30 is also controlled by a central control unit 100 via a signal line 5. .

In a facsimile machine, the switch 8 is normally connected to the telephone 7 side, and in manual mode, the central control unit ato controls whether the operator presses the send or receive button.
o is detected and switched to the signal line 3 side.

Even in the automatic reception mode of facsimiles that has become popular in recent years, the switch 8 is normally connected to the telephone 7 side, and when a call signal from the other party is detected by the CI detection circuit 20, the switch 8 is connected to the center of the facsimile machine side. The control device controls the control circuit 30 according to predetermined timing.
Switch to the signal line 3 side via.

In such automatic reception mode, CI
Since the detection circuit 20 and the telephone 7 are connected in parallel,
Despite the automatic reception mode, the bell on the telephone 7 always rings when a call is received.

The ringing ring can be noisy in some cases, and it is impossible to distinguish whether the call is from a regular telephone or a facsimile machine. The drawback was that it was burdensome.

Purpose The present invention has been made in view of the above points, and an object of the present invention is to provide a network control device that has a simple and inexpensive structure and is configured so as not to ring the calling bell of a telephone when it is not necessary. purpose.

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings. However, in the following drawings, the same or corresponding parts as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted. Also, here, a network control device used in a facsimile machine will be explained as an example.

The network control device of the present invention shown in FIG. 2 is provided with an off-knock detection circuit 400, and this off-hook detection circuit 400 is connected to the telephone 7 via the switch 10. This switch 10 switches the telephone 7 to either the line 2 side (CI detection circuit 200) side or the line off-footer detection circuit 4005 side by means of the signal line 11 of the control circuit 300. These switches are driven by the central control unit 100 via signal lines 5, 13, control circuit 300 and signal line 11.4.

The off-footer detection circuit 40'O detects when the handset of the telephone is taken off and the hook is turned off, and the detection signal is sent to the central control unit 10 of the facsimile machine via the signal line 9.
0 will be informed.

Next, FIG. 3 shows the above configuration in further detail.

As shown in FIG. 3, the CI detection circuit 200 includes a transformer 43
The transistor 39, which is insulated and connected to the line, is driven by the call signal.

As shown in the figure, a capacitor 4 is connected to the primary side of the transformer 43.
4. A calling signal is input via a resistor 45. The secondary output of the transformer 43 is input to the base of the transistor 39 via an attenuator consisting of a resistor 41.42, and its collector output is connected to a time constant circuit consisting of a capacitor 37 and a resistor 36.38, so that the output of the capacitor 37 is called. Signal detection signal output. Further, a power supply voltage of, for example, 5V is applied to one side of the resistor 36.

In such a configuration, the call signal is transmitted through a capacitor 44 for removing DC components and a resistor 4 for preventing saturation of the iron core of the transformer.
5 and is input to the primary side of the transformer 43. Transformer 1
The signal input to the next side is output as a reduced signal to the secondary side according to the turns ratio of the transformer. This signal is current limiting resistor 4
2 and is input to the base of a transistor 39 to form a transistor.

Note that the diode 25 is used to prevent the transistor connected to the secondary side of the transformer from being destroyed when an excessive human power signal is applied to the primary side of the transformer.

The ring detection signal is sent via the amplifier 35 to the signal line 6 to the central control unit i1:100.

The control circuit 300 also includes amplifiers 33, 34 each receiving a signal line 13, 15 as an input, and each of these amplifiers 33, 34 drives a relay solenoid 46, 47t via a signal line 11.4. relay solenoid 4
6.47, for example, a power supply voltage of 12V is applied to one side,
Each drives a switch 10.8.

Each of the lines 2 and 12 of the off-hook detection circuit 400 is provided with a drive circuit for a beam lane lens 20.22, and the switch 21.23 driven by this is used as an off-hook detection output.

A DC power supply 50 is connected in series to the line 12. and risk 16. to 7 in parallel. Capacitor 18. A relay solenoid 20 is connected. Also, on one side of the track 2, there is a varistor 1 as well.
7. Capacitor 19. A solenoid drive circuit consisting of a solenoid 22 is adapted to be connected to the line in series with the telephone 7 when line 2 is selected. switch 21.2
3 are each connected to ground on one side and a circuit consisting of a similar resistor 24, 26 and capacitor 30 is connected to the other side.

This circuit charges the capacitor 28 by applying a power supply voltage of, for example, 5V through the resistor 24 when the switch 21 (23) is open, and discharges the capacitor 28 by closing the switch 21 (23). Let's do it, or gate 32
, and sends an off-hook detection signal to the central controller 100 via the signal line 9. Therefore, when the switch 10 is connected to the upper side in the figure, the direct current power supply 50 is connected to the telephone 7.
current flows through the solenoid 20, the switch 21 closes,
The off-second link detection signal is sent via signal line 9 to the central controller.

Further, a terminal device such as a facsimile machine is connected to the line 3 via a filter consisting of a coil 14 and a capacitor 15, and a known line protection device 60.

Next, FIG. 4 shows a flowchart of the network control procedure according to the present invention.

In step Sl in FIG. 4, the switch 8 is connected to the line 2 side. Thereby, when there is a call, the CI detection circuit 200 can detect the call signal.

Next, in step S2, the switch 10 is connected to the line 12.
Switch to the side. As a result, telephone 7 and line 1 are disconnected, and the calling signal is detected only by CI detection circuit 200.

Subsequently, in a loop of steps S3 to S4, detection of an off footer or a calling signal is waited for.

When the operator lifts the handset and unhooks it, current flows from the DC type 550 to the relay solenoid 20 via the transmitter, handset, coil, etc. inside the phone, turning on the switch 21, as described above. Then, an off-second/link detection signal is sent from the signal line 9 to the central control unit 100.

(See Figure 3) When the off-footer is detected as described above, the process moves from step S3 to step S6, where the switch 10 is switched to the line 2 side, the telephone 7 and line 1 are connected, and a call can be made. . At this time, the varistor 17, the capacitor 19, and the relay solenoid 22 are connected in series to the line of the telephone 7. Therefore, 7 who are always on the line
The relay solenoid 22 is excited by a DC component of approximately 5 V, and an off-book detection signal is provided to the central controller 100 from the signal line 9 as long as the hook is disconnected in the same way as described above.

Subsequently, the process moves to step S7, and a manual call is made as in the conventional case. In step S7, after calling the other party, at a predetermined timing, the switch 8 is switched to the facsimile machine side on line 3 and beyond, and image transmission is performed according to a known procedure.

When the image transmission is completed, the switch 8 is switched again to the CI detection circuit on the track 2 side in step S8, and after confirming that it has been lowered in step S9, the switch 10 is returned to the track 12 side in step S2. , steps 83 to S4
Return to the loop.

On the other hand, when a calling signal arrives from line l in the loop of steps 33 to S4, the transistor 39
is turned ON, and a detection signal of a calling signal is sent to the central control device 100 via the signal line 6. At this time, the switch 10 is connected to the line 12 side, and the call bell does not ring.

As a result, a jump from steps 34 to S5 is performed,
Thereafter, in step S5, the same operation as the conventional automatic call reception is performed.

In step S5, according to a predetermined procedure, the switch 8 is switched to the line 3 side, image transmission is performed, and when the transmission is finished, the switch 8 is switched to the line 2 side again, and then the loop of steps S3 to S4 is returned to. do.

As described above, you can manually make a call by following the conventional procedure of lifting the handset and performing an off-footer even in automatic reception mode, and also ring the telephone when receiving a call in the case of automatic reception. No need to ring.

The above configuration can be constructed very easily and inexpensively by simply adding a relay and an off-footer detection circuit to the conventional circuit.

Further, the present invention is applicable not only to facsimile machines but also to various systems such as computer online systems.

Effects As is clear from the above description, the present invention includes off-hook detection means for detecting that a connected telephone is off the hook, and switching the telephone between a line and the off-hook detection means. The simple and inexpensive configuration eliminates the need to ring a call bell when automatically receiving calls, reducing the burden on the operator, while also making it possible to make calls in the same way as before. It is possible to provide an excellent network control device with less

[Brief explanation of drawings]

11.DELTA. is a block circuit diagram of a conventional network control device, and FIGS. 2 and 3 are detailed explanations of the present invention, respectively. 1...Line 7...Telephone 8.10.
...Switch 20...CI detection circuit 40...Off footer detection circuit

Claims (1)

[Claims] A network control device comprising: off-hook detection means for detecting that a connected telephone is off the hook; and means for switching the telephone between a line and the off-hook detection means.