JPS59161167A - Network control device - Google Patents

Abstract

PURPOSE:To execute a data transmission which is capable of no-ringing connection by using an existing exchange network, and also to execute a remote test by making a device have such functions as a bracketing test instruction of a terminal use network control device and a meter, etc., and a result decision. CONSTITUTION:A no-ringing trunk (NRT)5 is provided on an incoming station 4, a network control device (TNR-NCU)6 is provided on a terminal, and by combining two kinds of dial signals, a central network control device (C-NCU)2 controls the NRT5 and the TNR-NCU6, and executes a no-ringing connection. Also, in case when a bracketing test to the TNR-NCU6 is instructed from a CPU1, the C-NCU2 sends out a bracketing test instructing code together with a terminal selecting code. The TNR-NCU6 executes a turning-back test at an outlet of a designated meter connecting terminal, and in case when its result is good, a space code of a constant interval of time or above is sent back to the C-NCU2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telemeter system using telephone lines, such as automatic inspection of meters for water, gas, electricity, etc. The present invention relates to a network control device for a center of a telemeter system that performs data transmission without causing any trouble.

Automatic meter reading for water, gas, electricity usage, etc. or TV viewership surveys.

As a method for easily collecting subtotal data scattered over a wide area, such as when surveying the usage of vending machines, by sequentially activating the slave stations from the master station, 2
The most promising method is to use the time when no calls are being made to transmit data, and it is attracting attention.

In addition, its application fields are very wide, and it is expected that it will become widespread in the future.

When transmitting data using a subscriber telephone line in this way 2 If you make a normal connection, the bell of the telephone of the terminal connected to the same line will ring, and in the case of data transmission such as automatic meter reading (= doesn't work.

Therefore, the key point is how to switch between a connection in which the telephone bell rings for normal calls and a connection in which the telephone bell does not ring during data transmission.

In other words, the problem is how to achieve a no-ringing connection that does not ring the telephone only when transmitting data, by using the existing telephone exchange network that has a two-to-one connection mode as is.

In addition, when a huge number of terminal devices are installed over a wide area, such as in a two-wire system, the entire system can be centrally tested to find faulty parts in the R period.

It is necessary to clarify the demarcation of responsibility between telecommunications carriers providing no-ringing networks and users of meters, etc.

In any case, without having to go directly to the terminal device,
There is a need for efficient remote testing methods at the center that can discover system failures.

The aim of the invention is to solve these problems.

It is an object of the present invention to provide a center network control device which is the core of a polling system for realizing a telemeter system and also as a separation test means.

Next, the principle and configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a no-ringing system using a general subscriber telephone line according to the present invention.

In the figure, 1 is an electronic computer (CPU).

2 is a center network control device (C-NOU) according to the present invention;
3 is the originating station connected to the center side, 4 is the terminating station connected to the terminal side, 5 is a special trunk or no-ringing trunk (NRT) added to the exchange of the terminating station in an actual no-ringing system, and 6 is for the terminal. Network control device (
7 is an information source such as a meter, and 8 is a subscriber telephone.

11 is a connection line, and 12 is a center side telephone line.

13 is the interoffice trunk line, 14, 15.16 is exchange 4 and NR
17 is a subscriber telephone line, 18 is a connection line between the telephone set 8 and 'rNR-NOU 6, and 19 is a meter cable.

A computer (CPU) 1 is a data collection device that has a function of controlling a center network control device 2, and a special trunk 5 is attached to a receiving station 4, This is a device for a new service that serves as a calling party for terminal-side devices and has a no-ringing connection function for terminal-side devices.

The terminal network control device ('rNR-NC!U) 6 is.

T) It has a no-ringing terminating network control function, a data modulation/demodulation function, and a meter selection activation function for receiving an activation signal from 9, and operates by using the station power supply via the normal subscription talk line 17.

The information source 7 indicates a meter capable of transmitting data, such as an electronic meter.

The telephone set 8 and subscriber telephone line 17 are already installed.

9 In addition to the center network control unit (0-NGU) 2 of the present invention, the special trunk (NR'-T') 5 and the terminal network control unit (TN'R-NOU) 6 are necessary Send dialing information.

This device has functions for transmitting and receiving various control signals and for data modulation and demodulation.

Next, we will explain the operation of the entire system, focusing on the center network control device that is the core of the system, as shown in Figures 2(a) to 2(a).
This will be explained with reference to (0).

First, the center network control unit (C-NC!U) 2 starts meter reading based on the instruction from the computer (CPU) 1, and creates the same conditions as for making a telephone call ((a) in the figure).

The originating station 5 detects this and returns a dial tone (DT) as the first dial request signal ((b) in the figure).
. The center network control unit (O-NCU) 2 detects this dial tone (DT) or sets the dial sending timing to a certain period of time after the loop is closed.

0-NCU2 is a special trunk that is a hidden number from cpul, ie, no-ringing trunk (NR'T) 5
When you receive dialing information for.

In addition to converting it into a first dial signal and transmitting it.

Send a no-ringing trunk control signal (NRTS).

The originating station 6 sends the dial information to the terminating station 4 through the inter-office trunk line 13. T (Incoming Trunk
), the switching operation of the terminating station 4 (special trunk (NRT) 5 is selected from the second, and the special trunk (N is now 0-
The NCU 2 and the special trunk 5 are now connected ((C) to (d) in the figure).

Next, the special trunk (NRT) 5 connects the C-NCU 2
No-ringing trunk control signal (NRTS) from
The C-NCU 2 determines whether the call is from a legitimate C-NCU 2 or not, and in the event of an erroneous call, sends a message such as NU)-key.

If a no-ringing trunk control signal (NRTS) is received, a second dial request signal (SDR,) is sent to C-
Send N0U2+2 ((e) in the figure).

After receiving the second dial request signal (SDR), C-N0U2 transmits the no-ringing trunk control signal (NRT).
S), and waits for the SDR from the special trunk (NRT) 5 to stop ((f) in the figure). After confirming that SDR has stopped.

The C-NCU 2 converts the second dial information received from the CPU 1 as a subscriber number into a second dial signal and sends it out, and also sends out a no-ringing trunk control signal (NR
TS) to the special trunk 5 (from (g) in the figure to (
1)).

At the receiving station 4, a switching operation is performed based on this signal, and after connection, a terminal network control device (T
) JR-NOU) 6 and waits for a response from the terminal network control unit (TNR-NCU) 6. At this time, since the 16H2 bell signal is not sent from the receiving station 9, a no-ringing connection is established in which the telephone bell does not ring. In this case, if the subscriber line is busy, a visit tone is sent to the center from the special trunk (NRT).

In the special trunk 5, the terminal network control device (TNR-NC
U) When a response from 6 is detected, 9 terminating station 4 and originating station 5
The polarity inversion signal is sent to the center network control device (C-NO
U) Return it to 2 ((J) in the figure).

When the 0-NCU 2 detects this polarity reversal, it sends a terminal to the terminal network control unit (TNR-NCU) 6 to select the terminal number of a meter sensor, etc. connected to the terminal network control unit (TNR-NOU) 6. Send the selection code ((g) in the figure).

In this state, c-NO'U2 and terminal network controller (TNR)
-NOU )6 enters full data communication mode and (
Data is exchanged between the 3PU 1 and the meter sensor 7 ((1) in the figure). In this case, if a call is made during data communication, the special trunk (NRT) detects this.

Sends a visit tone to the center.

When the data communication is finished, the C-NCU2 receives a no-ringing trunk control signal (NRT) based on the instruction from the CPU1.
After stopping the transmission of S) and restoring the polarity of the 9 lines to normal, open the DC loop (from (m) to (0) in the diagram)
.

In this way, first stop NRTS and then use the special trunk (N
RT) 5 is restored, the terminal-side subscriber telephone line 17 is disconnected, and after detecting the polarity of the line to be restored, the DC loop is opened, which causes the noise caused by the relay etc. to flow to the terminal side when it is opened. This can prevent the occurrence of ringing.

In addition, when the C-N0U2 continuously connects with another terminal network control unit (TNR-NOU) 6 of the same terminating station switching equipment, the C-N0U2 also sends a no-ringing trunk control signal (N
After the transmission of the no-ringing trunk control signal (NRT) is stopped and the polarity of the two lines is restored to normal, the no-ringing trunk control signal (NRT
S), and the second dial signal is sent in the same manner.

Next, from the CPU 1 to the terminal network control device (TNR-NOU)
)6, the disconnection test instruction code is sent together with the terminal selection code at ←) in Figure 2, and the terminal network control unit (TNR-NCU) 6 selects the specified meter. Carry out a return test at the exit of the connection terminal, and if the result is good, turn the double space code 0 after a certain period of time.
-Send it back to NOt12. That is, in this case, the space code is transmitted as 11-nili data in the data communication mode (1) in FIG.

In this case, the meter may remain connected to the TNR-NCU 6, and the meter is not activated unnecessarily.

0-NCU2 determines the pass/fail of the test and sends the result to the CPU.
Notify 1.

FIG. 3 shows two center network control devices (0
-NCU) 2, and is means for realizing the functions explained in FIGS. 1 and 2. 21 is a loop closure and polarity reversal detection circuit; 22 is a dialing signal sending circuit for sending out first and second dial signals; and 26 is a no-ringing trunk control signal (NRTS) sending circuit.

24 is a modulation circuit for data modulation, 25 is a 40DI-Iz receiving circuit for dial tone or visit tone detection, 26
2 is a second dial request signal (SDR) receiving circuit, 27 is a demodulation circuit for data demodulation, 28 is a 2-wire/4-wire conversion hybrid circuit that combines transmission and reception, 29 is a control circuit, and 30 is a computer (CPU) 1 It is an interface circuit with etc. Further, a terminal 31 is a telephone line on the center side, and a terminal 32 is a connection terminal with a computer.

Furthermore, during the separation test, 63 sends out the separation test instruction code added to the terminal selection code via the modulation circuit 24, and receives the test result response from the TNR-NCU 6 via the demodulation circuit 27, Determine the pass/fail of the test and send the result to the CPU
This is a test judgment circuit added to notify the test.

In this way, the system of the present invention; to realize a no-ringing connection in two terminals, a special trunk, that is, a /-ringing trunk (NRT) 5 is provided at the receiving station 4, and the terminal terminal is connected to a terminal network control unit (TNR-NOU). /, and these are controlled by the center network control unit (0-NOU) 2, and the first dial signal and the second dial signal are combined.

Furthermore, the center network control unit (0-NOU), which is the core of the nine-poling system, has a terminal network control unit ('rN
Provide a separation test instruction and result judgment function at the demarcation point between R-NOU) and a meter, etc.: A simpler remote testing method is possible.

As shown below-12, the center network control device (0
-NOU), this center network control device can be connected directly to subscriber telephone lines, and there is no need to take local conditions into account. A data transmission system capable of no-ringing connection using a network can be realized.

Furthermore, by using the same procedure, it is possible to construct a unified system that can perform isolation tests on a huge number of network control devices for terminals scattered over a wide area, without having to visit the terminals directly.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a no-ringing system using a general subscriber telephone line according to the present invention. Figure 2 is a diagram showing the operation sequence of the system in Figure 1;
FIG. 3 is a block diagram showing a circuit of a center network control device according to an embodiment of the present invention. 1... Computer (CPU), 2... Center network control device (C-NC!U), 3... Originating station, 4...
- Terminating station, 5... No-ringing trunk (NRT)
. 6...Terminal network control unit (TNR-NCU), 7.
. . . Information source, 8 . . . Subscriber telephone set, 21 . . . Loop closure and polarity reversal detection circuit, 22 . 23... No-ringing trunk control signal transmission path,
24... Modulation circuit for data modulation, 25... 400Hz receiving circuit for dial tone and visit tone detection,
26... Second dial request signal receiving circuit, 27...
Demodulation circuit for data demodulation, 28... 2-wire-4-wire conversion hybrid circuit, 29... Control circuit. 30... Interface circuit, 33... Test determination circuit.

Claims (1)

[Scope of Claims] 1. A center network control device that is installed at the entrance of the center side network of a data transmission system connected to a general subscriber telephone line and operates by being connected to a data processing device such as a computer, A loop closing circuit that closes a loop between the center network control device and the originating station to which the center network control device is connected, and a dial tone and a visit tone that detect a visit tone from the originating station and a dial tone as a first dial request signal. a detection circuit, and a first dial signal for transmitting a first dial signal to the originating station.
A dial signal sending circuit and a no-ringing trunk control signal sending circuit that sends a no-ringing trunk control signal to the no-ringing trunk attached to the terminating exchange; a 2-dial request signal receiving circuit, a second dial signal sending circuit for sending a second dial signal to the no-ringing trunk, a polarity reversal detection circuit for detecting polarity reversal from the no-ringing trunk, and a connection to the receiving station. a data modulation/demodulation circuit for performing data communication with the network control device for terminals, and an interface circuit for the data processing device, and an isolation test from the data processing device to the network control device for terminals. When instructed, it sends a test instruction code to the network control device for the terminal, and at the same time detects the space code from the network control device for the terminal for a certain period of time or more to determine the pass/fail of the test, and sends the result. It also has a test determination circuit that notifies the data processing device, and is characterized by having a disconnection test function in addition to the functions of performing network control and data communication when a general subscriber telephone line is used as a no-ringing system. A network control device for the center. The following plan