JPH0678067A - Terminal network control device - Google Patents

Abstract

PURPOSE:To prevent the generation of malfunction due to moderate polarity inversion generated at the time of restoring a line, a dialing pulse applied from a telephone set or the like and to prevent power consumption from being increased. CONSTITUTION:A flip flop(FF) F1 is set up when the voltage of a telephone line L2 exceeds a prescribed value, and reset when the voltage of a telephone line L1 exceeds the prescribed value. An FF A2 is set up by an output signal Q from the F1 and an FF B2 is set up by an inverted output signal Q'. After supplying an output signal from the FF A2 to a control part 7 as a start signal, an FF B1 is reset by a pulse BCLR outputted from the control part 7, so that the FF B2 is prevented from being set up by the inverted output signal of the FF F1 and the FFs B2, A1 are similarly processed to prevent the FF A2 from being set up by the output signal of the FF F1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal network controller for a no ringing system.

[0002]

2. Description of the Related Art In a terminal network control device for a no-ringing system using a subscriber telephone line, when starting a terminal network control device of a subscriber's house from a central information station through the subscriber telephone line, a command from the central information station is used. NR
A method of transmitting a no-ringing call from the T (no-ringing trunk) to the subscriber telephone line is adopted, and when this no-ringing call is input to the terminal network control device, it changes from the standby state to the operating state, and a series of telemeter Communication is to take place. Here, the no-ringing call means a state of recovery (L ₁ = 0 (v), L ₂ = −48 (v)) to a polarity inversion state (L ₁ = −48 (v), L ₂ = 0 (v)). It refers to a series of signal changes that appear on the subscriber telephone line called slow polarity reversal, which is the transition process of. The slow polarity inversion is performed from the viewpoint of so-called chin noise prevention of a telephone that is also connected to the subscriber telephone line.

Further, when installing the terminal network control device in the subscriber's house, the reverse connection is performed in the same manner as in the case of a normally operating telephone, so that the operator may be unfamiliar with the reverse connection. There is still the potential to be done. This reverse connection may occur not only when the terminal network control device is installed, but also when the subscriber telephone line is constructed. In this case, a wide area reverse connection occurs, and both are no ringing systems. Is a major obstacle to promoting.

Under these circumstances, the development of a non-polar terminal network control device which operates normally regardless of the direction of connection to the subscriber telephone line is being promoted.

FIG. 5 is a block diagram of a conventional non-polar terminal network control device.

This terminal network control device 101 is connected to a subscriber telephone line and rectifies a voltage polarity of the subscriber telephone line in one direction, an output of the rectifier circuit 103 and the terminal device 1.
Network control circuit 107 connected between the network control device 107 and the network control circuit 107, which is connected to the output of the rectification circuit 103 and connected to the network control circuit 107 for controlling no ringing communication. Is connected between the subscriber telephone line and the telephone set or other terminal network control device, and connects the subscriber telephone line to the telephone set or other terminal network control device. The switch 111 is included in the configuration.

The starting circuit 109 includes an input signal detector 113 for detecting the input of the no-ringing call signal,
Activation signal generator 115 for generating activation signal based on detection
It is composed of.

Next, the activation of the terminal network control device 101 will be described with reference to the circuit diagram of the rectifying circuit 103 and the activation circuit 109 shown in detail in FIG.

When a no ringing call is input to the terminal network control unit 101 from the NRT via the subscriber telephone line,
The voltage waveform of the output of the rectifier circuit 103 is rectified as shown in FIG. In the input signal detection unit 113, the voltage of the rectified signal is divided by the resistors R1 and R2, and the divided voltage is delayed by the time constant determined by the resistor R3 and the capacitor C1 to start it as a no-ringing call signal. The signal is output to the signal generator 115. This no-ringing call signal is supplied to the clock terminal (C) of the D flip-flop 117 which constitutes the activation signal generator 115 via the resistor R4.
K). As a result, the activation signal generator 115
Will output an activation signal to the network control circuit 107, triggered by the rising edge of the no-ringing call signal, for example. The time constant in the input signal detector 113 is
It is set to correspond to the time required for slow polarity reversal appearing on the subscriber telephone line.

Thus, the non-polar terminal network controller 10
For the start-up of No. 1, the change in voltage appearing on the subscriber telephone line is rectified in one direction by the rectifier circuit, and the change in voltage is used.

[0011]

In the above-mentioned conventional terminal network control device 101 for the no ringing system,
There is no problem in the case of gentle polarity inversion from the line restoration state to the polarity inversion state at the time of no ringing call. But,
After the end of the no-ringing communication, the voltage change appearing on the subscriber telephone line is input through the rectifier circuit 103 even when the polarity is reversed from the polarity inversion state to the line restoration state. Further, in the terminal network control device 101 for the no-ringing system having the above-described configuration, a telephone or another terminal network control device is connected in parallel to the subscriber telephone line via the switch 111. Therefore, even when dialing is performed by a dial pulse during a call operation from a telephone or another terminal network control device, the voltage change appearing in the subscriber telephone line is rectified by the rectifier circuit 1.
It will be input via 03.

The starting circuit 109 having the above-mentioned conventional circuit configuration
Then, by inputting such a signal, dialing by dial pulse at the time of slow polarity reversal from the polarity reversal state after the end of no-ringing communication to the line restoration state or at the call operation from the telephone or other terminal network control device Even if the ringing is not related to the call, the network control circuit 10 detects the reciprocity by the fluctuation of the input voltage after rectification.
The start signal is output to 7, which may cause malfunction.

Further, since the network control circuit 107 uses an internal power source such as a battery, each time the start signal is received, the power of the internal power source is wastefully consumed and the operation is ensured. Therefore, it is necessary to increase the internal power supply capacity, which is an obstacle to downsizing and price reduction of the device.

The present invention has been made in view of the above,
It is an object of the present invention to provide a terminal network control device which prevents gradual polarity reversal at the time of line restoration, malfunction due to dial pulse from a telephone or other terminal network control device, and prevention of increase in power consumption. It is in.

[0015]

To achieve the above object, the terminal network control apparatus of the present invention has a first input terminal connected to one of the telephone lines to detect a voltage signal between the telephone lines. The 2 input terminals are connected to the other of the telephone lines, and are set when the voltage of one telephone line exceeds a predetermined voltage value, and reset when the voltage of the other telephone line exceeds a predetermined voltage value. A first flip-flop, and
Second flip-flop that is set by the output signal of the first flip-flop that is output when the first flip-flop is reset, and the first flip-flop that is output when the first flip-flop is reset. A third flip-flop set by an inverted output signal of the second flip-flop, a start-up signal supply means for supplying the output signals of the second and third flip-flops to the control unit as start-up signals, and a second flip-flop of the second flip-flop. After the output signal is supplied to the control unit as a start signal,
First set preventing means for preventing the third flip-flop from being set by the inverted output signal of the flip-flop, and after the output signal of the third flip-flop is supplied to the control unit as a start signal. And a second set preventing means for preventing the second flip-flop from being set by the output signal of the first flip-flop.

[0016]

In the terminal network control device of the present invention, the first flip-flop is set when the voltage of one telephone line exceeds a predetermined voltage value, and the voltage of the other telephone line exceeds a predetermined voltage value. When the output signal of the first flip-flop is set, the second flip-flop is set by the output signal of the first flip-flop, the third flip-flop is set by the inverted output signal of the first flip-flop, and the second and third flip-flops are set. The output signal of the first flip-flop is supplied to the control unit as the activation signal, the output signal of the second flip-flop is supplied to the control unit as the activation signal, and then the third flip-flop is activated by the inverted output signal of the first flip-flop. It is prevented from being set, and after the output signal of the third flip-flop is supplied to the control unit as a start signal, The by the output signal of the flop 2
This prevents the flip-flop from being set.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rectifying circuit 103 and a starting circuit 1 used in a terminal network control device according to an embodiment of the present invention.
2 is a circuit diagram showing a detailed circuit configuration of FIG. The circuit shown in the figure is connected between the subscriber telephone lines L1 and L2 and the terminal device 105 like the terminal network control device shown in FIG. 5, and the rectifier circuit 103 shown in FIG. 5 has the same configuration as the rectifier circuit 103 shown in FIG.
Corresponds to the starting circuit 109 shown in FIG.

In FIG. 1, the starting circuit 1 comprises an input signal detecting section 3 and a starting signal generating section 5. The input signal detector 3 has a flip-flop F1 in which a reset terminal R and a set terminal S are connected to the telephone lines L1 and L2 via resistors 51 and 52, respectively, and the set terminal S and the reset terminal R of the flip-flop are connected. Are diodes D connected in series between the ground and the voltage source V, respectively.
It is connected to the connection point of 1, D2 and D3, D4.

The activation signal generator 5 includes flip-flops A1 and A2 in which a clock terminal CK is connected to the output terminal Q of the flip-flop F1 and a flip-flop in which a clock terminal CK is connected to an inverting output terminal Q'of the flip-flop F1. B1, B2 and flip-flop A2
Two-input OR circuit G in which the output terminal Q of B2 is connected to the input
It consists of The set terminal S of the flip-flop A1 is connected to the control unit 7, and the reset terminal R is supplied with the one-shot pulse ACLR from the control unit 7. Further, the data terminal D of the flip-flop A1 is supplied with the voltage V, and the output terminal Q is connected to the data terminal D of the flip-flop A2. Also,
The one-shot pulse INTCL from the control unit 7 is supplied to the reset terminal R of the flip-flop A2.

The set terminal S of the flip-flop B1 is also connected to the control section 7, and the reset terminal R is connected to the control section 7.
The one-shot pulse BCLR from is supplied. Further, the data terminal D of the flip-flop B1 is supplied with the voltage V, and the output terminal Q is connected to the data terminal D of the flip-flop B2. The reset terminal R of the flip-flop B2 is supplied with the one-shot pulse INTCL from the controller 7.

The operation of the terminal network control device configured as described above will be described with reference to the timing charts shown in FIG.

A no-ringing call signal is input from the NRT to the terminal network control device via the subscriber telephone lines L1 and L2 as shown in FIG.
When the point becomes a certain voltage or more, that is, the threshold level of the flip-flop F1 or more, as shown in FIG. 2B,
The flip-flop F1 is set at time T1 as shown in (d) and (e) of FIG.

When the output Q of the flip-flop F1 rises, the flip-flops A1 and A2 detect the rising trigger, and the output Q of the flip-flop A2 becomes high level as shown in (g) of FIG. This signal passes through the OR gate G, and as shown in FIG.
Signal to activate the control unit.

After that, no ringing communication is performed.
Then, the one-shot pulse INTCL signal for resetting the flip-flops A2 and B2 is inputted from the control unit 7 before the communication is terminated and the terminal network control device is powered down, as shown in (L) of FIG. Further, the control unit 7 detects that the activation signal is generated by the flip-flops A1 and A2, and outputs the one-shot pulse BCLR signal that resets the flip-flop B1 as shown in (W) of FIG. As a result, the output Q of the flip-flop B1
Becomes low level as shown in FIG.

Next, after the end of the no-ringing communication, when the polarity is reversed and the line is restored to the line recovery state, if the point b of the input signal detecting section 3 becomes a certain voltage or more, that is, the threshold level of the flip-flop F1 or more, the flip-flop becomes. F1 is reset at time T3 as shown in (d) and (e) of FIG. As a result, the output Q'of the flip-flop F1 becomes high level, and it becomes a rising trigger of the flip-flops B1 and B2. However, at this time, the flip-flop B2 does not output the activation signal to the control unit 7 because the low-level output of the flip-flop B1 is read as data. After that, by repeating the above operation, the control unit 7 does not operate due to the extreme situation at the end of transmission.

Next, no ringing communication in the case of reverse connection will be described with reference to the time chart of FIG.

First, when the voltage at the point b of the input signal detecting section 3 rises as shown in FIG. 3C due to the no-ringing call, and becomes a certain voltage or more, the flip-flop F1
Are reset as shown in (d) and (e) of FIG.
As a result, the Q'output of the flip-flop F1 rises, the flip-flops B1 and B2 detect the rising trigger, and the output of the flip-flop B2 changes to a high level. This high level signal passes through the OR circuit G and the control unit 7
It becomes the start signal of. Hereinafter, the same operation as the forward connection described with reference to FIG. 2 is performed, and before the terminal network control device is powered down, the control unit 7 outputs the activation signal to the flip-flops B1, B.
2 is detected, and the flip-flop A1 is detected.
And outputs a one-shot pulse ACLR signal for resetting. This causes the Q output of A1 to go low.

Next, when the polarity returns after the end of the no-ringing communication, the point a of the input signal detecting section 3 rises, and when the voltage exceeds a certain voltage, the flip-flop F1 is set. At this time, the Q output of the flip-flop F1 serves as a rising trigger of the flip-flops A1 and A2, but since the flip-flop A2 reads the low-level output of the flip-flop A1 as data, it is impossible to output the activation signal to the control unit 7. Absent.

As described above, the control unit 7 outputs the start signal to the flip-flops A1 and A2 and the flip-flop B1.
Which of B2 is generated is detected. For example, when the activation signal is generated by the flip-flops A1 and A2, the one-shot pulse for resetting the flip-flop B1 is input to lower the Q output of B1 to a low level. Even if the flip-flops B1 and B2 of the activation signal generator 5 detect a rising pulse at the time of slowly inverting the polarity from the polarity inversion state to the line restoration state after the end of the no-ringing communication, the L level of the Q output of B1 is changed to B2. Since it is read as data, the Q output of B2 is still at a low level so that the start signal is not generated.

Next, the operation of making a call from the telephone set or another terminal network control device will be described with reference to the time chart of FIG.

The voltage waveform appearing on the subscriber telephone line at the time of dialing by the dial pulse during the call operation from the telephone or the other terminal network control device is the line restoration state (L ₁ =
From 0 (v), L ₂ = -48 (v), the telephone line or another terminal network control device off-hooks the subscriber telephone line (L ₁ = 0 (v), L ₂ = E ₂ (E ₂ : Off-hook voltage by the telephone or terminal network controller)), and after a pre-pause period of several seconds, a dialing signal by dial pulse is output (a signal "0" is sent out in FIG. 4) (L ₁ = 0 (v) , L ₂ = −48 (v) and E ₂ are repeated), and the next dialing signal (the signal “3” in FIG. 4) is output after the minimum pause which is the dialing signal transmission suspension period.

First, in the line restoration state, L ₁ = 0 (v),
Since L ₂ = −48 (v), a of the input signal detector 3
The point voltage is 0 (v), the point voltage is E ₁ (E ₁ ; V (power supply voltage) + V _z (forward voltage of the protection diode)), and b
Since the voltage E _{1 at the} point is higher than the threshold level at which the flip-flop F1 detects the H level, the flip-flop F1 is continuously reset.

Therefore, when the dialing waveform by the dial pulse at the time of the calling operation from the telephone or the other terminal network control device is inputted to the terminal network control device, the telephone line or the other telephone network off-hook of the subscriber telephone line is hooked. Operation (Fig. 4
The time T _21), b-point voltage of the input signal detector 3 E
₂ '(E _2'; voltage minus the voltage drop due to the rectifier circuit from E _2), and the reset signal of the flip-flop F1 is released.

When a dialing signal by a dial pulse is input (time T _{22 to} T _{23 in} FIG. 4), the voltage of the subscriber telephone line is L ₁ = 0 (v), L ₂ = -48 (v). , L
_Since a waveform of ₁ = 0 (v) and L ₂ = E ₂ is input, the voltage waveform appearing at the point b of the input signal detection unit 3 is also shown in FIG.
As shown in the repetitive waveform of the E ₁ and E ₂ '. Therefore, the flip-flop F1 is reset when the voltage at the point b is E ₁ , and reset is released when the voltage at the point b is E ₂ ′.

On the other hand, while the dialing signal by this dialing pulse is input (T _{22 to} T ₂₃ ), the polarity of the subscriber telephone line is not inverted, so that the voltage at the point a of the input signal detecting section 3 is applied. Is still 0V. That is, in the process of inputting a dialing signal by a dialing pulse from the line restoration state, the flip-flop F1 only repeats the reset release → reset state → reset release from the reset state, and the flip-flop F1 is never set to the set state. Q remains L level,
The Q'output of the flip-flop F1 remains at H level. Therefore, the flip-flops A1, A2, B1, B2
A signal to be detected as a rising trigger is not input to, and the activation signal is not output to the control unit 7.

As described above, unless the polarity of the subscriber telephone line is reversed, the output of the flip-flop F1 is kept unchanged, and the activation signal generating section 5 is driven during the calling operation from the telephone or another terminal network control device. It is designed not to let you.

Even when L1 and L2 are connected in reverse, the activation signal generator 5 activates because the polarity of the subscriber telephone line is not reversed during a call operation from the telephone or another terminal network control device. It cannot be called.

Therefore, according to the present embodiment, it is possible to prevent erroneous activation of the no-ringing communication, while it is not necessary to increase the internal power supply capacity in the network control circuit, so that the size and cost of the device can be increased. There is no invitation.

[0040]

As described above, according to the present invention,
The first flip-flop is set when the voltage of one telephone line exceeds a predetermined voltage value, and reset when the voltage of the other telephone line exceeds a predetermined voltage value.
The second flip-flop is set by the output signal of the flip-flop, the third flip-flop is set by the inverted output signal of the first flip-flop, and the output signals of the second and third flip-flops are used as start signals. It prevents the third flip-flop from being set by the inverted output signal of the first flip-flop after being supplied to the control unit and the output signal of the second flip-flop being supplied to the control unit as a start signal. , The second flip-flop is prevented from being set by the output signal of the first flip-flop after the output signal of the third flip-flop is supplied to the control unit as the activation signal, so that the no-ringing communication ends. Telephones or other terminal networks that are connected in parallel when the polarity reverses to the later line restoration state Without malfunction by the dial pulse or the like at the time of calling operation from the control device, also without problems be connected back to the telephone line, always operate accurately. In addition, since the malfunction does not occur, the control unit and the like do not operate unnecessarily to consume electric power, and the economy is achieved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a detailed circuit configuration of a rectifying circuit and a starting circuit used in a terminal network control device according to an embodiment of the present invention.

FIG. 2 is a timing chart showing an operation during no ringing communication in the case of the forward connection in the embodiment shown in FIG.

FIG. 3 is a timing diagram showing an operation during no ringing communication in the case of the reverse connection of the embodiment shown in FIG.

FIG. 4 is a timing diagram showing an operation at the time of a call operation from another telephone or the like connected in parallel in the embodiment shown in FIG.

FIG. 5 is a circuit configuration diagram of a conventional terminal network control device.

6 is a detailed circuit diagram of an input signal detection unit and a start signal generation unit used in the conventional terminal network control device shown in FIG.

FIG. 7 is a timing diagram showing an operation of the conventional terminal network control device shown in FIG.

[Explanation of symbols]

 1 Start-up Circuit 3 Input Signal Detection Section 5 Start-up Signal Generation Section 7 Control Section 103 Rectifier Circuit A1, A2, B1, B2, F1 Flip-Flop G OR Circuit L1, L2 Telephone Line

Claims (1)

[Claims] 1. A first means for detecting a voltage signal between telephone lines.
The input terminal of is connected to one of the telephone lines, the second input terminal is connected to the other of the telephone lines, and it is set when the voltage of one telephone line exceeds a predetermined voltage value. A first flip-flop that is reset when the voltage exceeds a predetermined voltage value, and a second flip-flop that is set by the output signal of the first flip-flop that is output when the first flip-flop is set Of the second flip-flop, the third flip-flop set by the inverted output signal of the first flip-flop output when the first flip-flop is reset, and the second and third flip-flops. A start signal supplying means for supplying an output signal to the control section as a start signal, and an output signal of the second flip-flop is supplied to the control section as a start signal. After that, the first set preventing means for preventing the third flip-flop from being set by the inverted output signal of the first flip-flop, and the output signal of the third flip-flop are controlled as start signals. A second set preventing means for preventing the second flip-flop from being set by the output signal of the first flip-flop after being supplied to the terminal network control device.