JPH06125285A - Repeater supervisory and control system - Google Patents

Abstract

PURPOSE:To perform the automatic control of a branch gate switch incorporated in a repeater at an opening/closing state before power failure even when the default state of the switch occurs due to the power failure, etc., and it is set in the opening/closing state different from that before power failure. CONSTITUTION:This system is equipped with the repeaters 6, 7, and 8 which relay and transmit a CATV signal, a head end 5 which performs the transmission/reception of the CATV signal between each repeater via bidirectional CATV transmission lines 9, 10, and 11, and a center supervisory controller 1 which collects and monitors the monitoring information data of an operating state from each repeater by polling each repeater with a control message (x) and also, controls the opening/closing of the branch gate switch incorporated in the repeater 8 when polling is performed by the latest control instruction data of an operation at a man-machine interface part 2. Also, it is equipped with a control result history data base 4 in which the control instruction data when such operation is performed is stored, and a monitoring information data base 3 in which the monitoring information data from each repeater is stored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repeater supervisory control system, and more particularly to a repeater supervisory control system for a repeater used in bidirectional CATV transmission.

[0002]

2. Description of the Related Art In bidirectional CATV transmission forming a branch network, there is a problem of ingress noise from the transmission line to the center, and noise generated from all subscriber terminals and repeaters in the upstream transmission band frequency and Interfering signals mixed in are concentrated in the center,
Deteriorate transmission quality. In order to reduce this ingress noise, a gate for an upstream signal is provided at a key part of the branch network, and a downstream signal is controlled from the center. This gate is provided as a branch gate switch in the repeater at key points.

Referring to FIG. 3, a conventional repeater monitoring control system includes a repeater 7 connected to a CATV transmission line 10 for relaying and transmitting a CATV transmission signal, and a CATV transmission line 11.
Connected to the CATV transmission signal for relay transmission and having a built-in branch gate switch, and a CATV transmission path 9 connected in cascade via CATV transmission path 10 and repeater 7 via transmission path 11. Connect 8 to branch to CATV
Each of the relay 6, which relays the transmission signal, and the relay 6, the relay 7, and the relay 8 is polled to collect the monitoring information data of the operating state sequentially from each of them, and the relay is performed by the remote control instruction from the operator. Control device 1 for controlling the opening and closing of the branch gate switch built in the device 8
And CATV transmission line 9, CATV transmission line 10 and CA
A headend 5 for transmitting / receiving a CATV transmission signal to / from the repeater 6, the repeater 7, and the repeater 8 through the TV transmission path 11.
And a man-machine interface unit 2 which is connected to the center monitoring control device 1 and which gives an instruction for control to the center monitoring control device 1 by an operator.

Referring to FIG. 2 in combination with FIG. 3, a detailed description will be given.
In order to collect the monitoring information data of the operating state from each of the repeater 6, the repeater 7, and the repeater 8, the center monitoring control device 1 sends a control message using only the polling / control message identification code a to the headend 5. The signal is output in the downstream direction of the CATV transmission line 9, the CATV transmission line 10 and the CATV transmission line 11 via the route, and the relay device 6, the relay device 7 and the relay device 8 are sequentially polled. Receiving the polling control message, the repeater 6, the repeater 7, and the repeater 8 output the monitoring information data indicating their own operating states in the upstream direction of each CATV transmission path and send it to the center monitoring controller 1. . The center monitoring control device 1 outputs the contents of the latest monitoring information data sent from each of the repeater 6, the repeater 7 and the repeater 8 to the man-machine interface section 2 to notify the operator. As a result, the operator centrally monitors the operating states of the repeater 6, the repeater 7, and the repeater 8 on the man-machine interface unit 2.

Here, when the operator forcibly remote-controls the branch gate switch built in the repeater 8, the operator first selects the repeater 8 to be remote-controlled by the man-machine interface unit 2 with respect to the center supervisory controller 1. Then, the open / closed state of the branch gate switch is specified and the control is instructed. Upon receiving this control instruction, the center monitoring control device 1 sends a control message x obtained by adding an individual repeater identification code b and an open / close designation code c to the polling / control message identification code a via the headend 5 in accordance with the control instruction. Each CATV transmission path is sent out in the downstream direction to sequentially poll each repeater. In this control message x, the individual repeater identification code b and the switching designation code c are
It is ignored by the repeaters 6 and 7 that do not have the branch gate switch. Repeater 8 with built-in branch gate switch
After receiving the control message x, the branch gate switch is opened / closed according to the open / close designation code c, and the monitoring information data indicating the operating state of the branch gate switch including the opened / closed state of the controlled branch gate switch is sent up the CATV transmission line 11. And outputs the data to the center monitoring control device 1. The center monitoring controller 1 notifies the operator of the contents of the monitoring information data sent from the repeater 8 via the man-machine interface unit 2. After the branch gate switch has been normally controlled, unless the operator newly instructs the repeater 8 to open / close the branch gate switch, the center monitoring control device will operate even if the open / close state of the branch gate switch changes thereafter. No. 1 does not send the individual repeater identification code b and the open / close designation code c to the repeater 8, but continues the normal polling by the polling / control message identification code a.

[0006]

In this conventional repeater monitoring and control system, when a power failure occurs in the repeater 8 due to the stop of power supply to the repeater, the open / closed state of the branch gate switch is defaulted. And the controlled open / closed state before the power outage occurs,
The operator has to perform the opening / closing control operation of the branch gate switch again each time.

[0007]

SUMMARY OF THE INVENTION A repeater supervisory control system according to the present invention comprises a plurality of repeaters connected to each bidirectional transmission network and having at least one gate means for upstream transmission signals. A transmission / reception device that transmits / receives the transmission signal to / from the plurality of repeaters through a transmission network, and polls the plurality of repeaters via the transmission / reception device to collect and monitor monitoring information data of each operating state and A monitoring control device that controls the opening and closing of the gate means at the time of the polling by control instruction data at the time of operation, and a storage means that stores the control instruction data and the monitoring information data are provided.

In the repeater monitoring and control system according to the present invention, the repeater is a CATV repeater amplifier, and the gate means is a branch gate switch.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Referring to FIG. 1, which shows an embodiment of the present invention, a repeater monitoring and control system is connected to a CATV transmission line 10 and a C
A repeater 7 for relaying and transmitting an ATV transmission signal, a repeater 8 connected to the CATV transmission line 11 for relaying and transmitting the CATV transmission signal, and a built-in branch gate switch 8, and a CATV transmission line 9
Connected to the CATV transmission line 10 to connect the repeaters 7 in cascade and the transmission line 11 to connect the repeater 8 in a branching manner to repeat and transmit the CATV signal, and the repeater 6 and the repeater 7. A center monitoring control device 1 for polling each of the relays 8 and 8 to collect monitoring information data of operating states from each of them and controlling opening / closing of a branch gate switch built in the relay 8 in accordance with a remote control instruction from an operator. A head end 5 for transmitting and receiving CATV transmission signals to and from the repeater 6, the repeater 7 and the repeater 8 through the CATV transmission line 9, the CATV transmission line 10 and the CATV transmission line 11; A man-machine interface section 2 for instructing control to the center monitoring and control apparatus 1 by means of a relay machine 8 connected to the center monitoring and control apparatus 1 Control result history database 4 which stores storing a history of the opening and closing control result of the branch gate switch
And a monitoring information database 3 which is connected to the center monitoring control device 1 and stores and stores the latest monitoring information data of each of the relays 6, 7, and 8.

2 will be described in detail with reference to FIG. 1 together with FIG. 1, the center monitoring control device 1 collects monitoring information data from each of the repeater 6, the repeater 7 and the repeater 8. The control message x including the polling / control message identification code a, the individual repeater identification code b, and the polling / control message identification code a is sent to the CATV via the headend 5.
Transmission line 9, CATV transmission line 10 and CATV transmission line 1
1 is output in the down direction, and the repeater 6, the repeater 7, and the repeater 8 are sequentially sent out and polled. Receiving the polling control message, the repeater 6, the repeater 7, and the repeater 8 output the monitoring information data indicating their own operating states in the upstream direction of each CATV transmission path and send it to the center monitoring controller 1. . The center monitoring control device 1 outputs the latest monitoring information data sent from each of the repeater 6, the repeater 7 and the repeater 8 to the monitoring information database 3 for storage / storing, and the contents thereof. It is output to the interface unit 2 to notify the operator. As a result, the operator centrally monitors the operating states of the relay 6, relay 7, and relay 8 on the man-machine interface unit 2.

Here, when the operator forcibly remote-controls the branch gate switch built in the repeater 8, the operator first separates the repeater 8 to be the remote control target in the machine interface unit 2 with respect to the center monitoring control device 1. Then, the open / closed state of the branch gate switch is specified and the control is instructed. The contents of this control instruction are stored and stored in the control result history database 4 connected to the center monitoring control device 1. Further, the center monitoring control device 1 that has received this control instruction polls according to the control instruction.
The control message x including the control message identification code a, the individual repeater identification code b, and the open / close designation code c is sent to the head end 5
To output in the downstream direction of each CATV transmission line to sequentially poll each relay. In this control message, the individual repeater identification code b and the open / close designation code c are
It is ignored by the repeaters 6 and 7 that do not have the branch gate switch. Repeater 8 with built-in branch gate switch
After receiving the control message, the branch gate switch is opened / closed according to the open / close designation code c, and the monitoring information data indicating the operating state of the branch gate switch including the opened / closed state of the controlled branch gate switch is sent in the upstream direction of the CATV transmission line 11. To the center monitoring control device 1. The center monitoring control device 1 stores and stores the monitoring information data sent from the repeater 8 in the monitoring information database 3, and notifies the operator of the contents. After the branch gate switch is normally controlled, even if the operator does not newly instruct the repeater 8 to open / close the branch gate switch, or even if the open / close state of the branch gate switch changes after the normal control, The center monitoring control device 1 continues polling with reference to the control result history database 4 by the control message with the polling / control message identification code a, the individual repeater identification code b, and the open / close designation code c at the latest control instruction data. .

As a result, even if a power failure occurs due to, for example, the power supply being stopped in the repeater 8 and the built-in branch gate switch is in the default state and is in an open / close state different from that before the power failure, the center monitoring control is performed. The device 1 refers to the control result history database 4 and refers to the control message x at the time of the latest control instruction data before the relay 8 is out of power.
Therefore, the branch gate switch is automatically controlled to the same opening / closing state as before the occurrence of the power failure by the first polling sent to the repeater 8 after the power failure recovery even if the operator does not instruct the opening / closing control.

[0013]

As described above, according to the present invention, even if the branch gate switch built in the repeater becomes the default state due to a power failure, etc. It can automatically control the open / close state before a power failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing a repeater monitoring control system according to an embodiment of the present invention.

FIG. 2 is a content of a telegram of the repeater monitoring control system of the same embodiment.

FIG. 3 is a block diagram showing a conventional repeater monitoring control system.

[Explanation of symbols]

 1 center monitoring control device 2 man-machine interface 3 monitoring information database 4 control result history data base 5 headend 6, 7, 8 repeater 9, 10, 11 CATV transmission line

Claims (2)

[Claims] 1. A plurality of repeaters connected to each bidirectional transmission network and having at least one upstream transmission signal gating means, and transmission and reception of the transmission signals with the plurality of repeaters through the bidirectional transmission network. And a transmission / reception device that performs the polling of the plurality of repeaters via the transmission / reception device to collect and monitor the monitoring information data of each operating state and control instruction data at the latest operation of the gate means at the time of the polling. A repeater supervisory control system, comprising: a supervisory controller that controls opening and closing; and a storage unit that stores the control instruction data and the supervisory information data. 2. The repeater supervisory control system according to claim 1, wherein the repeater is a CATV repeater amplifier, and the gate means is a branch gate switch.