JPH0817423B2 - Terminal network controller - Google Patents

Description

The present invention relates to a terminal network control device, and more particularly to a terminal network control device for no ringing communication.

[Prior Art] FIG. 3 is a block diagram showing a configuration of a data communication system using a telephone line.

In the data communication system of FIG. 3, the center device
30 includes a host computer 21 and a center side network control unit (C-NCU) 22. The center side network control device 22 is
It is connected to the center side telephone exchange 23 via a telephone line 31. On the other hand, the terminal device 25 is a terminal network control device (T-NC
U) 26, meters 27, 28 and other terminals and telephone 29 are included. The terminal network control device 26 is connected to the terminal-side telephone exchange 24 via a subscriber telephone line 33. The center side telephone exchange 23 and the terminal telephone exchange 2 are connected to each other by a telephone line 34.

In the no ringing communication method, the host computer 21
In response to this command, the center side network control device 22 calls the no ringing trunk 34 and holds it. Next, after the no-ringing trunk 34 reverses the polarity of the subscriber telephone line 33, a no-ringing ringing signal (hereinafter referred to as NRS signal)
To the terminal network control device 26. The terminal network control device 26
When the S signal is detected, the meter 27 is connected to the subscriber telephone line 33 without ringing the telephone 29. As a result, communication is performed between the meter 27 and the center device 30.

On the other hand, at the time of automatic terminal transmission, the terminal network control device 26 automatically calls the center side control device 22 at a predetermined time. In this case, the meter reading information of the meter 27 is transmitted to the host computer 21 via the terminal network control device 26, the telephone lines 33, 32, 31 and the center side network control device 22. The host computer 21 calculates a charge and performs an aggregation process based on the meter reading information.

For NRS signal, single frequency signal of 2080Hz and 2
A mixed frequency signal containing two frequency components (hereinafter DTMF (Du
al Tone Multi-Frequency) signal) is used. A push button (PB) signal is used as the DTMF signal.

For DTMF signals, as shown in Fig. 4, 697Hz, 77Hz, 8
Low group frequency consisting of 52Hz and 941Hz and 1209Hz, 1336H
In combination with the high group frequencies of z and 1477 Hz, there are 10 different signals corresponding to pushbuttons 0-9. Among the PB signals, “*”, “#”, “A”,
"B", "C", "D" are not used for NRS signals.

The terminal network control device 26 of FIG. 3 is mainly composed of a polarity inversion detection circuit for detecting polarity inversion of a subscriber telephone line, an NRS.
It includes a no-ringing ringing signal detection circuit (hereinafter, referred to as NRS detection circuit) for detecting a signal and a CPU (central processing unit). These circuits are driven by a power supply source such as a battery.

When the polarity reversal detection circuit detects the polarity reversal of the subscriber telephone line when no ringing is received, the polarity reversal detection circuit triggers the NRS detection circuit, or the polarity reversal detection circuit is configured by a CPU or other trigger circuit. Trigger the NRS detection circuit via. As a result, the NRS detection circuit receives power from the power supply source and NRs the subscriber telephone line.
Whether the S signal is given and whether the signal is normal N
Determine whether it is an RS signal. Subsequent routines are executed based on the determination result.

[Problems to be Solved by the Invention] When a plurality of terminal network controllers are connected to a subscriber telephone line, the polarities of the subscriber telephone lines are reversed, and then the NRS detection circuits of the plurality of terminal network controllers are simultaneously operated. It triggers. Therefore, if the NRS detection circuit or the like is driven by the power from the subscriber telephone line, the voltage of the subscriber telephone line drops. Therefore, normally, the NRS detection circuit and the like are driven by a power supply source other than the subscriber telephone line, such as a battery, as described above.

However, in the above-mentioned conventional terminal network control device, the NRS detection circuit is triggered each time the polarity of the subscriber telephone line is reversed, and power is supplied from the power supply source such as a battery. Therefore, the power of the power supply source such as the battery is frequently consumed.

An object of the present invention is to provide a terminal network control device that consumes less power.

[Means for Solving the Problems] A terminal network control device according to the present invention is a terminal network control device that performs no ringing communication in response to a predetermined no ringing call signal having a plurality of frequencies provided via a communication line. Then, the first detection means, the second detection means, and the power supply means are provided. The first detecting means is
It is driven by the power supplied from the communication line and detects one frequency contained in the no ringing ringing signal. The second detecting means detects a no ringing ringing signal given through the communication line. The power supply means supplies power to the second detection means in response to the detection of one frequency by the first detection means.

[Operation] In the terminal network control device according to the present invention, when the first detection means detects one frequency included in the no-ringing ringing signal, the second detection means receives power from the power supply means and thus no ringing occurs. The ringing signal is detected. That is, unless the predetermined frequency is present in the communication line, the power is not supplied from the power supply means to the second detection means. Therefore, power consumption can be reduced.

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

FIG. 1 is a block diagram showing the configuration of a terminal network control device according to an embodiment of the present invention.

The terminal network control device 100 is connected to the subscriber telephone lines 1a and 1b and calls itself to perform communication with other terminal devices or perform no ringing communication. The home telephone 2 is connected to the subscriber telephone lines 1a and 1b via the terminal network control device 100. Further, the terminal network control device 100 is connected with a meter, a sensor 15 or the like. The information of the meter or sensor 15 is transmitted to the center device or the like via the terminal network control device 100 after the telephone line link is established.

A polarity reversal detection circuit 3 is connected to the subscriber telephone lines 1a and 1b. This polarity reversal detection circuit 3 is used for the subscriber telephone line 1
Detects DC bias inversion of a and 1b. The terminal network control device 100 is provided with a primary NRS detection circuit 5 and a secondary NRS detection circuit 7. The primary NRS detection circuit 5 is supplied with power from the subscriber telephone lines 1a and 1b by the power supply circuit 5. On the other hand, the secondary NRS detection circuit 7 is supplied with power from the secondary side power supply circuit 9 including a battery or the like.

The power supply circuit 4 includes a transformer circuit that transforms the voltage of the subscriber telephone lines 1a and 1b into a predetermined voltage. Further, the AC signals on the subscriber telephone lines 1a and 1b are given to the primary NRS detection circuit 5 via the AC coupling circuit 4a. The primary NRS detection circuit 5 is
It is composed of a frequency detection circuit and a filter in the preceding stage thereof, and detects one preset frequency out of seven types of frequencies in the low group and the high group. For example, when the NRS signal for this terminal network control device 100 is set to the PB signal corresponding to "1", the primary NRS detection circuit 5 has 697
Either one of Hz and 1209 Hz is detected (see FIG. 4). The primary NRS detection circuit 5, when detecting a predetermined frequency, gives an interrupt signal I to the CPU circuit 8.

The secondary NRS detection circuit 7 detects an NRS signal, and is usually composed of a dedicated LSI. The secondary NRS detection circuit 7 is connected to the secondary side power supply circuit 9 via the trigger circuit 6. The trigger circuit 6 is composed of a switch circuit, and turns on in response to a trigger signal TR1 from the CPU circuit 8.

The CPU circuit 8 is constantly supplied with power by the secondary power supply circuit 9. The secondary side power supply circuit 9 generates the minimum voltage that allows the CPU circuit 8 to maintain the standby state during standby, but the control signal C1 from the CPU circuit 8 is generated.
In response to, the CPU circuit operating mode voltage is generated.

The line coupling circuit 10 is connected between the subscriber telephone lines 1a and 1b and the data transmission / reception circuit 11 and has a control signal C from the CPU circuit 8.
Controlled by 2. The line coupling circuit 10 has a dial pulse transmitting function and a line off-hook function. In addition, the line coupling circuit 10 includes a data transmission / reception circuit 11
AC signals supplied from the subscriber telephone lines 1a and 1b are transmitted, and AC signals supplied from the subscriber telephone lines 1a and 1b are transmitted to the data transmitting / receiving circuit 11. The data transmission / reception circuit 11 is
Data is exchanged with the meter or sensor 15 via the CPU circuit 8. The data transmission / reception circuit 11 can also transmit a PB signal.

The interface unit 13 includes the CPU 8 and a meter or sensor.
Combine with 15. The data transmitting / receiving circuit 11 and the interface unit 13 are connected to the secondary side power supply circuit 9 via the trigger circuit 12. The trigger circuit 12 is composed of a switch circuit and turns on in response to a trigger signal TR2 from the CPU circuit 8.

Next, the operation of the terminal network control device shown in FIG. 1 at the time of no ringing incoming call will be described.

First, the polarity reversal detection circuit 3 detects the D of the subscriber telephone lines 1a and 1b.
When the polarity reversal of the C bias is detected and the DC bias satisfies a predetermined value, the power from the subscriber telephone lines 1a and 1b is supplied to the primary NRS detection circuit 5 via the power supply circuit 4. As a result, the primary NRS detection circuit 5 operates to detect whether or not one predetermined frequency is applied to the subscriber telephone lines 1a and 1b. When the primary NRS detection circuit 5 detects one predetermined frequency, the primary NRS detection circuit 5 gives an interrupt signal I to the CPU circuit 8. In response to the interrupt signal I, the CPU circuit 8 gives a control signal C1 to the secondary side power supply circuit 9 and gives trigger signals TR1 and TR2 to the trigger circuits 6 and 12, respectively. Thereby, the secondary power supply circuit 9 boosts the supplied voltage to a predetermined voltage. In addition, the trigger circuit 6,12
Is turned on, and power is supplied from the secondary side power supply circuit 9 to the secondary NRS detection circuit 7, the data transmission / reception circuit 11 and the interface section 13.

When the secondary NRS detection circuit 7 detects the NRS signal set for this terminal network control device 100, it outputs the detection signal DET.
It is given to the CPU circuit 8. As a result, the CPU circuit 8 gives the line coupling circuit 10 the control signal C2. The line coupling circuit 10 couples the subscriber telephone lines 1a and 1b with the data transmitting / receiving circuit 11. As a result, the meter or sensor 15 and the subscriber telephone line
The link with 1a and 1b is established. As a result, the data from the meter or sensor 15 is transferred through the CPU circuit 8, the data transmission / reception circuit 11 and the line coupling circuit 10 to the subscriber telephone lines 1a, 1b.
Sent to. In this way, the meter or sensor 15
And data communication is performed between the terminal device and another terminal device, center device, or the like.

In the terminal network control device 100 of FIG. 1, only when the primary NRS detection circuit 5 detects one predetermined frequency, 2
Since power is supplied from the secondary side power supply circuit 9 to the next NRS detection circuit 7, the data transmission / reception circuit 11, and the interface unit 13, power consumption is reduced.

FIG. 2 is a block diagram showing the configuration of a terminal network control device according to another embodiment of the present invention.

In the terminal network control device 100 of FIG. 2, the trigger circuit 6
The trigger signal TR3 is directly applied to the a from the primary NRS detection circuit 5. In addition, the trigger signal TR4 from the secondary NRS detection circuit 7
It is given to the CPU circuit 8. The structure of other parts is the first
The configuration is the same as that of the terminal network control device in the figure.

Primary NRS detection circuit 5 when no ringing is received
Detects a predetermined frequency, it gives a trigger signal TR3 to the trigger circuit 6a. As a result, the trigger circuit 6a is turned on, and the secondary side power supply circuit 9 supplies power to the secondary NRS detection circuit 7. As a result, the secondary NRS detection circuit 7 operates. When the secondary NRS detection circuit 7 detects the NRS signal, it gives the detection signal DET and the trigger signal TR4 to the CPU circuit 8. The CPU circuit 8 supplies the control signal C1 to the secondary side power supply circuit 9 and the trigger signal TR2 to the trigger circuit 12 in response to the trigger signal TR4. Thereby, the secondary power supply circuit 9 boosts the supply voltage. Further, the trigger circuit 12 is turned on, and power is supplied from the secondary power supply circuit 9 to the data transmitting / receiving circuit 11 and the interface section 13.

In this terminal network control device 100, power is supplied to the secondary NRS detection circuit 7 only when one predetermined frequency is detected by the primary NRS detection circuit 5, and further,
Since power is supplied to the data transmission / reception circuit 11 and the interface unit 13 only when a predetermined NRS signal is detected by the secondary NRS detection circuit, power consumption is further reduced.

As described above, according to the present invention, when the first detecting means detects one frequency included in the no ringing ringing signal, the second detecting means is supplied with power from the power supplying means. Therefore, power consumption is reduced. Therefore, energy saving is achieved in the no ringing communication.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a terminal network control apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of a terminal network control device according to another embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of the data communication system. FIG. 4 is a diagram showing frequencies forming a push button signal which is a no ringing ringing signal. In the figure, 1a and 1b are subscriber telephone lines, 4 is a power supply circuit, 5 is a primary NRS detection circuit, 6,6a and 12 are trigger circuits, 7 is a secondary NRS detection circuit, 8 is a CPU circuit, and 9 is 2 The secondary side power supply circuit, 100 is a terminal network pushing device. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In response to a predetermined no ringing ringing signal composed of a plurality of frequencies, which is given through a communication line,
A terminal network control device for performing no-ringing communication, which is driven by electric power supplied from the communication line and detects one frequency included in the no-ringing ringing signal. Second detection means for detecting the no-ringing ringing signal, and power supply means for supplying power to the second detection means in response to the detection of the one frequency by the first detection means. A terminal network control device provided with.