JPH0670296A - Remote supervisory and controlling system for catv network supervisory and controlling device - Google Patents

Abstract

PURPOSE:To make the control and the report of the abnormality of a CATV transmission line to a remote location possible by automatically connecting a CATV broadcasting center and the remote location from the CATV broadcasting center when the abnormality of the CATV transmission line is generated. CONSTITUTION:A general public line MODEM 3a provided with a synchronous communication mode is connected to the central processing unit 1 of a supervisory and controlling device 8 and also a MODEM control circuit 5 for controlling the state of the general public line MODEM by receiving the buzzer contact point signals of an alarm display panel 4 is provided. Thus, when the abnormality of the CATV transmission line is generated, the CATV broadcasting center and the remote location are automatically connected by a general public line and the control and the report of the abnormality of the CATV transmission line can be received at the remote location.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring control system for a CATV network monitoring control device, and in particular, when a CATV transmission path is abnormal, a center and a remote place are automatically connected via a communication line. C for remote areas
CAT that enables notification and control of abnormalities on ATV transmission lines
The present invention relates to a remote monitoring control system for a V network monitoring control device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional remote monitoring control system for a CATV network monitoring control device is a monitoring control device 9 and a plurality of monitoring control devices 9 connected via a plurality of leased line modems 7a and 7b. The monitoring control terminal 2 of FIG.

The monitoring controller 9 is the central processing unit 1.
And a plurality of RF modems 6 connected to the CATV transmission path.
And the occurrence of an abnormality in the CATV transmission line is notified by a buzzer and a lamp, and the buzzer contact signal output is output by the central processing unit 1.
Alarm display panel 4 and a plurality of leased line modems 7a
With.

The central processing unit 1 collects monitoring data on the CATV transmission line via the RF modem 6 or controls communication with the monitoring control terminal 2 via the leased line modem 7a, and constantly monitors and controls via the leased line. It is kept in communication with the terminal.

In this way, the leased line modems 7a and 7b are always kept in a transmittable / receivable state, and the CATV broadcasting center and the remote place are kept in a supervisory control state regardless of whether there is an abnormality. .

[0006]

In the conventional remote monitoring control system of the CATV network monitoring control device, the CA
Since the TV broadcasting center and the remote location are always kept in communication, the communication line usage fee increases, and it is economical for remote monitoring control that is used only for emergency processing when an abnormality occurs when the CATV broadcasting center is absent at night. There was a problem that it was inappropriate.

The object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a remote monitoring control system of a CATV network monitoring control device, which uses a general public line only when a nighttime abnormality occurs in the CATV transmission line and greatly reduces the communication line usage fee.

[0008]

A remote monitoring control system for a CATV network monitoring control apparatus according to the present invention is a monitoring control terminal arranged at a remote location in a central processing unit of a CATV network monitoring control apparatus installed in a CATV broadcasting center. A model control circuit for controlling the state of a modem for ensuring communication with the central processing unit and the supervisory control terminal are automatically connected to each other via a general public line when an abnormality occurs, and the model control circuit is remote from the CATV broadcasting center. CATV in the ground
It has a configuration capable of monitoring and controlling the transmission line.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a remote monitoring control system of a CATV network monitoring control apparatus according to an embodiment of the present invention.

The embodiment shown in FIG. 1 includes a supervisory controller 8 and
It has a configuration including two dedicated line modems 7b and one general public line modem 3b, and three supervisory control terminals 2.

In addition to the central processing unit 1 shown in FIG. 3, which is the same as the conventional example shown in FIG. 3, an alarm display panel 4, two leased line modems 7a, six RF modems 6, and a main unit. A general public line modem 3a directly related to the invention and a modem control circuit 5 are provided side by side.

FIG. 2 is a circuit diagram of the modem control circuit 5 of FIG. 1, and also shows a general public line modem 3a connected by RS-232C.

The modem control circuit 5 shown in FIG. 2 has a switch 51, a switch control relay 52, and + 12V, sends a data terminal ready signal (ER signal) to the general public line modem 3a, and an alarm display board. A buzzer contact signal is supplied from 4 to control communication between the monitoring control device 8 and the monitoring control terminal 2.

The general public line modems 3a and 3b are
It has a function to register the synchronous communication mode and the telephone number of the automatic call destination in advance.

FIG. 4 is a flow chart of the operation of the embodiment of FIG. 1, and FIG. 5 is a diagram showing the buzzer contact signal output from the alarm display panel 4 and the ER signal output from the modem control circuit 5 in comparison.

As shown in FIG. 3, when a CATV transmission line abnormality occurs (step 101), a buzzer on the alarm display panel is activated, and at the same time, a buzzer contact signal is turned on (step 1).
02).

In response to the buzzer contact signal, the modem control circuit 5 switches the ER signal level given to the general public line modem 3a from low to high (step 103).

In response to this, the general public line modem automatically makes a call to the destination registered in advance (specifically, the telephone number of the modem connected to the supervisory control terminal at a remote place from the CATV broadcasting center). (Step 10
4) If the other party responds (automatic call reception), the supervisory control communication state is entered (step 106).

After that, if the buzzer sounding of the alarm display panel 4 is not stopped, the monitoring control communication is continued with the buzzer contact ON and the ER signal Hi still (steps 107, 112, 106).

In step 105, when there is no response from the modem on the other side, the call is stopped (step 108).

If the buzzer ringing of the alarm display panel 4 is stopped in step 107, the buzzer contact of the alarm display panel is turned off, the buzzer ringing is also turned off, and the ER signal becomes L.
It becomes ow level and the line is disconnected (steps 107 and 10).
9, 110, 111).

In this way, the above-mentioned communication state is continued until the buzzer operation of the alarm display panel 4 is stopped at the center, the buzzer contact signal is turned off, and the ER signal level becomes the Low level.

[0024]

As described above, the present invention is applicable to the CATV.
When an abnormality occurs on the transmission line, the center and the remote location from the center are automatically connected by a general public circuit, and the CATV transmission line can be monitored and controlled at the remote location, so that the general public line is not available at the center at night. There is an effect that the communication line usage fee can be remarkably reduced by using only the urgent processing for the abnormality occurrence in the above.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a remote monitoring control system of a CATV network monitoring control device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a modem control circuit 5 of FIG.

FIG. 3 is a configuration diagram of a remote monitoring control system of a conventional CATV network monitoring control device.

FIG. 4 is a flowchart showing the operation contents of the embodiment of FIG.

5 is a waveform diagram of a buzzer contact signal and an ER signal in FIG.

[Explanation of symbols]

 1 central processing unit 2 supervisory control terminals 3a, 3b general public line modem 4 alarm display panel 5 modem control circuit 6 RF modem 7a, 7b leased line modem 8, 9 supervisory control device

Claims (1)

[Claims] 1. A CAT installed at a CATV broadcasting center
In the central processing unit of the V network monitoring control device,
A model control circuit for controlling the state of the modem that secures communication with the supervisory control terminal located at a remote place is attached, and when the abnormality occurs, the central processing unit and the supervisory control terminal are automatically connected by a general public line. A remote monitoring control system for a CATV network monitoring control device, which enables monitoring and control of a CATV transmission line at a remote location from the CATV broadcasting center.