JP3181324B2 - Terminal network controller - Google Patents

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 a central information office activates a terminal network controller at a subscriber's home through a subscriber telephone line, a command from the central information office is required. NR
A method of transmitting a no-ringing call from a T (no-ringing trunk) to a subscriber telephone line is adopted. When the no-ringing call is input to a terminal network control device, the call is changed from a standby state to an operating state, and a series of telemeters are set. Communication is performed. Here, the no-ringing call means a recovery state (L ₁ = 0 (v), L ₂ = −48 (v)) to a polarity inversion state (L ₁ = −48 (v), L ₂ = 0 (v)). , A series of signal changes appearing on a subscribed telephone line, called a gentle polarity reversal, which is a transition process. It should be noted that the gentle polarity reversal is performed from the viewpoint of preventing the so-called tingling of the telephone connected to the subscriber telephone line.

[0003] In addition, when the terminal network control device is installed at the subscriber's house, the connection is performed in the same sense as in the case of a telephone that normally operates even in the reverse connection, so that the operator may be unfamiliar with the reverse connection. There is still a possibility that it can 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 in both cases, no ringing system is used. Has become a major obstacle in promoting. For this reason, the development of a non-polarity terminal network control device that normally operates in any direction with respect to the subscriber telephone line has been promoted. FIG. 7 is a configuration diagram of a conventional nonpolar terminal network control device.

The terminal network control device 101 is connected to a subscriber telephone line, and a rectifier circuit 103 for making the voltage polarity of the subscriber telephone line unidirectional, an output of the rectifier circuit 103 and the terminal device 1.
And a network control circuit 107 connected between the rectifier circuit 103 and an output of the rectifier circuit 103 in accordance with a voltage waveform (no-ringing call waveform) appearing at the output of the rectifier circuit 103. And a start circuit 109 for outputting a start signal for a no-ringing communication operation to the telephone line or another terminal network control unit for connecting and disconnecting the telephone line and the telephone or other terminal network control unit. This is a configuration having a switch 111.

The starting circuit 109 includes an input signal detecting unit 113 for detecting an input of a no ringing call signal,
Start signal generating section 115 that generates a start signal based on the detection
It is composed of Next, the terminal network control device 1
The activation of 01 will be described with reference to the circuit diagrams of the rectifier circuit 103 and the activation circuit 109 shown in FIG.

[0006] When a no ringing call is input from the NRT to the terminal network control device 101 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 detecting unit 113, the voltage of the rectified signal is divided by the resistors R1 and R2, and the divided voltage is delayed by a time constant determined by the resistor R3 and the capacitor C1, and is activated as a no ringing call signal. The signal is output to the signal generator 115. The no-ringing call signal is supplied to the clock terminal (C) of the D flip-flop 117 constituting the activation signal generation unit 115 via the resistor R4.
K). Thereby, start signal generating section 115
Outputs an activation signal to the network control circuit 107, for example, with the rising of a no-ringing call signal as a trigger. The time constant of the input signal detection unit 113 is
The setting is made in accordance with the time required for the gentle polarity reversal appearing on the subscriber telephone line.

As described above, the nonpolar terminal network controller 10
For the start-up of 1, the voltage change appearing on the subscriber telephone line is utilized by using a voltage change after rectifying the voltage polarity in one direction by a rectifier circuit.

[0008]

By the way, the terminal network control device 101 for a no-ringing system having the above-mentioned configuration.
In, telephones and other terminal network control devices are connected in parallel via a switch 111 to a subscriber telephone line.
For this reason, a voltage change appearing on the subscribed telephone line at the time of dialing by a dial pulse at the time of calling the telephone or calling operation from the telephone or another terminal network control device is input through the rectifier circuit 103.

However, in the starting circuit 109 having the above-described circuit configuration, such a signal input causes dialing by dial pulses at the time of calling a telephone or at the time of calling operation from the telephone or another terminal network controller. Even when there is no relation to the no-ringing call, a start signal is output to the network control circuit 107, which may cause a malfunction.

Along with this, the network control circuit 107
Since an internal power supply such as a battery is used, every time a start signal is received, the power of the internal power supply is wasted and the internal power supply capacity must be increased to ensure operation. This is an obstacle to downsizing and cost reduction of the device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has as its object to control telephones and other terminal networks connected to a subscriber telephone line without increasing the size and cost of the apparatus. It is an object of the present invention to provide a terminal network control device that ensures prevention of erroneous activation of no-ringing communication based on a signal irrelevant to a no-ringing call signal relating to a device.

[0012]

In order to achieve the above object, the present invention provides a rectifier circuit connected in parallel with a telephone line and another terminal network controller to make the voltage polarity of the telephone line constant. And a network control circuit connected between the rectifier circuit and the terminal device for controlling the no-ringing communication, and a start-up circuit unit for detecting the no-ringing call signal from the output of the rectifier circuit and activating the network control circuit. In the terminal network control device for the system,
The activation circuit detects a no-ringing call signal.
An input signal detection unit, and the input signal detection unit
When outputting the ringing call signal, the network control circuit
A start signal generating unit for starting, the input signal
A detecting unit configured to divide the output of the rectifier circuit into first and second voltages;
And a connection point between the first and second resistors and a ground.
And the third resistor and the first capacitor are directly connected.
A column-connected time constant circuit, a fourth resistor and a second capacitor,
Are connected in parallel and the diodes are connected in series.
And connected in parallel with the third resistor;
When the output of the rectifier circuit decreases, the first capacitor
A first discharging circuit for discharging the electric charge of the first capacitor;
Capacitor connected in parallel with the first discharge circuit.
Turns on when power is discharged and releases the charge of the first capacitor quickly.
And a second discharging circuit comprising a transistor for charging.
The time constant of the time constant circuit is
Said first condition based on a dialing signal by
Do not start the start signal generator depending on charging the sensor.
And the first discharge circuit and the second
Discharge circuit is based on the telephone calling signal from the subscriber telephone line
Turns on the transistor of the second discharge circuit during discharge
The gist is that it is set to a value that does not

[0013]

In the terminal network control device according to the present invention, no ringing
Rectification circuit output drops when a ringing call is input
When the first discharge circuit, the charge of the first capacitor
Through the third resistor and the charge of the first capacitor
Is discharged through the fourth resistor and the diode. Also,
The second discharge circuit operates when a discharge occurs by the first discharge circuit.
The transistor is turned on, and the charge of the first capacitor is
Discharge quickly. This allows for no ringing calls
Sometimes after completely discharging the first capacitor once
Charge the battery, detect the no-ringing call signal, and
The control circuit can be activated. Also, subscribed telephone line
The first discharging circuit when a telephone calling signal from
And a second discharging circuit, when discharging by a telephone calling signal,
To a value that does not turn on the transistor of the second discharge circuit
Start signal is output to the network control circuit.
Never. Furthermore, by the dial pulse of the telephone
When a dialing signal is input, the time constant circuit
Based on the dial pulse signal from the dial pulse of the talker
Depending on the charging of the first capacitor, a start signal generating unit
Is set to a value that does not activate
A start signal is output to the network control circuit by dialing the dial pulse.
There is no force.

[0014]

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

FIG. 1 is a diagram showing a circuit configuration of a rectifier circuit 103 and a starting circuit 1 constituting a terminal network control device according to one embodiment of the present invention. The activation signal generator 115 constituting the activation circuit 1 is the same as the conventional one, but the input signal detector 3
Are resistors R11, R12, R13, R14 as shown in the figure.
, Capacitors C11 and C12, a diode D11 and a transistor TR11. The feature is that the charge and discharge of the capacitor C11, which is the output voltage of the input signal detection unit 3, is controlled so that the activation signal generation unit is activated when a telephone is called or when a call is made from the telephone or another terminal network control device. 115 is not driven. Next, the operation of the present embodiment will be described separately for no ringing calling, telephone calling, and calling operation from a telephone or another terminal network control device. First, the no-ringing call will be described with reference to the time chart of FIG.

When a no-ringing call is input from the NRT to the terminal network control device via the subscriber telephone line, the output voltage of the rectifier circuit 103 falls below a certain voltage, so that the capacitor C11 charged in the line recovery state. Of the capacitor C11 and the charge of the capacitor C11 via the resistor R14 and the diode D11 (T ₁ ). Then, the transistor TR11, which is controlled by a diode D11 resistor R14 and capacitor C12 at time T _2, is by the ON state from the cutoff state, rapidly discharges the electric charge of the capacitor C11. The discharge of the capacitor C11 causes the transistor TR11 to be cut off again.

When the output voltage of the rectifier circuit 103 exceeds a certain voltage, the capacitor C11 starts to be charged with electric charge via the resistor R12 (T ₃ ). When the electric charge charged in the capacitor C11 exceeds a certain voltage (in this case, a threshold level at which the clock input signal of the D flip-flop 117 detects a rising trigger).
The D flip-flop 117 detects the rising trigger via the resistor R4 and outputs a start signal to the network control circuit 107 (T ₄ ). In this manner, the voltage change of the no-ringing call that appears between the subscriber telephone lines is detected. Next, the time of calling the telephone will be described with reference to the time chart of FIG.

At the time of calling the telephone, the voltage waveform appearing on the subscribed telephone line is in the line recovery state (L ₁ = 0 (v), L ₂ = −
48 (v)), the polarity inversion (L ₁ = −48v, L ₂ =
0 (v)), and a pause section of 0 to 2 seconds (L ₁ = −48
v, L ₂ = 0 (v)), and a call signal (L
₁ = −48 (v), L ₂ = 0 (v) +16 Hz 75 (V
rms)), a ringing signal pause section (L
After receiving ₁ = −48 (v) and L ₂ = 0 (v)), a 1-second call signal and a 2-second call signal pause section are repeated.

When such a telephone call is input to the terminal network control device, the capacitor C11 is activated when the line is restored.
Is not discharged because the polarity inversion is sharply performed (T ₁₁ ), and until the pause section T _{12 of} 0 to 2 seconds.
It is in a charged state.

While receiving a telephone call signal (T _{12 to} T _{12)
During (13} ), the charge charged in the capacitor C11 is repeatedly discharged when the output voltage of the rectifier circuit 103 becomes lower than a certain voltage, and charged when the output voltage becomes higher than a certain voltage. However, in charging and discharging in this case, the period from the start of discharging to the start of charging of the capacitor C11 is shorter than that at the time of the no ringing call, and the transistor TR11 controlled by the diode D11, the resistor R14, and the capacitor C12 is completely turned on, so that the capacitor C11 is rapidly turned on. Before the discharge is started, the diode D11 is cut off due to a change in the output voltage waveform of the rectifier circuit 103, and the capacitor C11 is charged with electric charge via the resistors R12 and R14. Therefore, the transistor TR11 is cut off.

Therefore, the diode D11 and the resistor R1
4 and the capacitor C12, the transistor TR11
, The signal for detecting the rising trigger is not output to the D flip-flop 117, and therefore, the start signal is not output to the network control circuit 107. In addition, the ringing signal pause section (T
₁₃ In ~T between _14), the charge of the capacitor C11 remains charged. Next, a call operation from a telephone or another terminal network control device will be described with reference to the time chart of FIG.

When dialing with a dial pulse at the time of a call operation from a telephone set or another terminal network control device, the voltage waveform appearing on the subscribed telephone line has a line recovery state (L ₁ =
0 (v), L ₂ = −48 (v)), the telephone or another terminal network controller performs off-hook of the subscribed telephone line (L ₁ = 0 (v), L ₂ = E ₂ (E ₂ : After a pre-pause period of several seconds, a dialing signal by a dial pulse is output (signal “0” is transmitted in FIG. 4) (L ₁ = 0 (v)). , L ₂ = - 48 and (v), the repetition of the E _2), after the minimum pause a dialing signal transmission pause interval, and outputs the next dialing signal (signal "3" in FIG. 4).

When a dialing waveform by a dial pulse at the time of a calling operation from such a telephone set or another terminal network control apparatus is input to the terminal network control apparatus, the telephone line of the telephone set or another terminal network control apparatus is joined. Off-hook operation (T
By ₂₁₎ becomes below a certain voltage the output voltage of the rectifier circuit 103, then the pre-pause period (T ₂₁ through T ₂₂₎ is turned from the transistor TR11 is a cut-off state is controlled with the diode D11 by a resistor R14 and capacitor C12 state , The charge that has been charged in the capacitor C11 during the line restoration state is discharged.

[0024] and the dialing signal is input by the dial pulse (T ₂₂ ~T _23), the voltage of the subscriber telephone line,
L ₁ = 0 (v), L ₂ = −48 (v), and L ₁ = 0
(V) Since the waveform of L ₂ = E ₂ is input, the voltage waveforms appearing at the output of the rectifier circuit 103 are also E ₁ and E ₂ ′ (48 v, respectively, a voltage obtained by subtracting the voltage drop by the rectifier circuit from E ₂ ). ) Appears. Therefore, when the output voltage of the rectifier circuit 103 to the capacitor C11 is E _1, the charge via the resistor R12 is charged, the output voltage of the rectifier circuit 103 charges when the E ₂ 'are discharged. During this discharge, the transistor TR11 is T ₂₂
Although until through T ₂₃ are turned cut off, at time T _23, the potential difference between the base voltage of the voltage and the transistor TR11 by the charge stored in the capacitor C11, by the time the E ₂ 'during dialing The diode D11, the resistor R14, the capacitor C12 and the like are turned on under the control of the diode D11, and the charge stored in C11 is rapidly discharged. Appears when the T ₂₃ in the waveform of FIG. 4, but may be shifted back and forth by the relationship of resistor R14 and capacitor C12. Therefore, D flip-flop 1
17 does not output a signal detected as a rising trigger.

The minimum pause period (T _{24 to} T ₂₅ ), which is the dialing signal transmission suspension period, includes a resistor R
Since the time constant is longer than the time constant of the capacitor 12 and the capacitor C11, the charge of the capacitor C11 is discharged.

Therefore, according to the present embodiment, erroneous activation of no-ringing communication can be prevented, but it is not necessary to increase the internal power supply capacity in the network control circuit. Will not be invited.

FIG. 5 is a diagram showing a circuit configuration of the input signal detector 13 constituting the terminal network control device according to the second embodiment of the present invention. This input signal detector 13 differs from input signal detector 3 shown in FIG. 1 in that a resistor R45 is connected to the collector of TR11.

The feature is that in the discharging operation of the capacitor C11 by the transistor TR11 controlled by the diode D11, the resistor R14 and the capacitor C12, the discharging is performed with the time constant determined by the resistor R45 and the capacitor C11. It is in.

FIG. 6 is a diagram showing a circuit configuration of an input signal detection unit 23 constituting a terminal network control device according to a third embodiment of the present invention. The input signal detection unit 23 is different from the input signal detection unit 13 shown in FIG. 5 in that the Zener diode ZD51 is connected to the output stage so that the anode is on the output side, and the anode of the Zener diode ZD51 is connected to the ground. A resistor R56 and a capacitor C53 are connected in parallel.

As a characteristic, when the capacitor C11 is charged with electric charge, a signal is output to the start signal generating section 115 only when the charging voltage of the capacitor C11 becomes higher than the Zener voltage V _ZD of the Zener diode ZD51. A delay is applied to the charging voltage of C11, and a signal further delayed by a time constant determined by a resistor R56 and a capacitor C53 connected to the anode side of the Zener diode ZD51 is output to the activation signal generation unit 115. It was to so. When discharging the capacitor C11, the diode D11 and the resistor R1
4 and the transistor TR11 controlled by the capacitor C12 are in the cut-off state, the capacitor C5 determining the output signal waveform to the activation signal generation unit 115
3 is discharged through the resistor R56 according to the time constant determined by the resistor R56 and the capacitor C53, and when the transistor TR11 controlled by the diode D11, the resistor R14 and the capacitor C12 is in the on state,
The charge charged in the capacitor C11 is transferred to the resistor R45,
In addition to discharging through the transistor TR11, the electric charge charged in the capacitor C53 is also discharged through the resistor R45 from the anode to the cathode of the Zener diode and the transistor TR11.

Therefore, according to the embodiment of FIGS. 5 and 6, finer charging and discharging timings can be set for charging and discharging of the capacitor C11.
It is possible to more effectively prevent the activation signal from being detected for a signal irrelevant to the no-ringing call than in the embodiment.

[0032]

As described above, according to the present invention, the activation circuit for activating the network control circuit is independent of the no-ringing call signal relating to the telephone and other terminal network controllers connected to the subscriber telephone line. Since it is prevented from being activated by such a signal, erroneous activation of the no-ringing communication based on a signal irrelevant to the no-ringing call signal can be reliably prevented without increasing the size and cost of the apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a time chart at the time of a no ringing call in the embodiment.

FIG. 3 is a diagram showing a time chart when the telephone is called in the embodiment.

FIG. 4 is a diagram showing a time chart at the time of a calling operation from a telephone or the like in the embodiment.

FIG. 5 is a diagram showing a circuit configuration of a second embodiment of the present invention.

FIG. 6 is a diagram showing a circuit configuration of a third embodiment of the present invention.

FIG. 7 is a diagram showing a general configuration of a terminal network control device for a no ringing system.

FIG. 8 is a diagram showing a configuration of a rectifier circuit and a start-up circuit constituting the terminal network control device.

FIG. 9 is a diagram showing a time chart for explaining the operation of the terminal network control device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 start circuit 3 input signal detection unit 13 input signal detection unit 23 input signal detection unit 101 terminal network control device 103 rectifier circuit 105 terminal device 107 network control circuit 109 start circuit 111 switch 113 input signal detection unit 115 start signal generation unit 117 D flip-flop

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 11/00-11/10

Claims (1)

(57) [Claims] 1. A rectifier circuit connected in parallel with a telephone line or another terminal network controller to a subscriber telephone line to make a voltage polarity of the subscriber telephone line constant, and a ringing connected between the rectifier circuit and the terminal device. In a terminal network control device for a no ringing system, comprising: a network control circuit for controlling communication; and a start circuit unit for detecting a no ringing call signal from an output of the rectifier circuit and starting the network control circuit, wherein the start circuit unit includes: Detect no ringing ring signal
An input signal detection unit, and the input signal detection unit
When outputting the ringing call signal, the network control circuit
An input signal detection unit configured to divide the output of the rectifier circuit, and a connection point between the first and second resistors and a ground. In between
And a third resistor and a first capacitor are connected in series.
Time constant circuit, the fourth resistor and the second capacitor are connected in parallel.
A diode is connected in series, and the third
Connected in parallel with the resistance of the
Discharges the first capacitor when the first
A discharge circuit connected to the first capacitor in parallel with the first capacitor;
When the circuit discharges, the first capacitor
A second discharge consisting of a transistor for rapidly discharging the charge
And a time constant of the time constant circuit is a dial pulse of the telephone.
Said first capacitor based on a dialing signal according to
Value that does not activate the activation signal generation unit depending on charging
And the first discharge circuit and the second discharge circuit are
At the time of discharging by the telephone calling signal from the second
A terminal network control device, wherein a transistor of a path is set to a value that does not turn on .