JPH05122700A - Catv monitoring system - Google Patents

Abstract

PURPOSE:To monitor and control all CATV repeating transmission lines by a center. CONSTITUTION:In the CATV bi-directional transfer system a center 30 monitors a controls respective CATV repeating amplifiers 100 to 180. A CATV repeating amplifier 150 provided with branch terminals 200 to 500 is provided with a function for status monitoring for home terminals (HT) 510 to 540 and a function holding the transferred information, enabling the data transfer between the CATV repeating amplifier and the HT. Thus, all the CATV transmission lines can be monitored by the center resulting in accurately grasping the troubled parts in the CATV transmission lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV bidirectional transmission system, and more particularly to a CATV monitoring system.

[0002]

2. Description of the Related Art Conventionally, in a CATV bidirectional transmission system, a CATV relay transmission line is used to frequency-multiplex information relating to monitoring and control sent from a monitoring control device installed in a center by HE, and The signal in the downstream band is transmitted to the CATV relay amplifier. Each CATV
Status monitor (hereinafter,
It is referred to as SMT. ) Each unit has a polling address, processes the items related to monitoring and control only when it matches the designation from the center, and transmits the content to the center as a signal in the upstream band as necessary.

In this way, data transmission is carried out between each CATV relay amplifier and the center, and the status of each CATV relay amplifier is monitored from the center to thereby obtain the CATV.
I was monitoring and controlling the condition of the relay amplifier.

[0004]

However, in the above-mentioned conventional method, each center can control and monitor each CATV relay amplifier, and the HT installed in each CATV receiver's house is also controlled by the center. However, there is a problem that the entire CATV transmission line from the center to the HT installed at each CATV receiver's home cannot be monitored.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a CATV monitoring system capable of quickly detecting an abnormality by monitoring the entire CATV transmission line at a center.

[0006]

According to the HT monitoring system of the present invention, in a CATV bidirectional transmission system, a monitoring controller for monitoring and controlling the operating state of a CATV relay amplifier, and a monitoring / control output from the monitoring controller. And a function for distributing and branching the signal sent from the HE, and for responding by polling selection from the center. For a CATV relay amplifier having a means for sending out and having a status monitoring function for a home terminal HT, which will be described later, and a function for holding the information sent thereto, and an HT, which will be described later, in an area covered by the CATV relay amplifier, the C
It has a tap-off TO for branching the signal output from the ATV relay amplifier to an HT, which will be described later, and a function for responding to the polling selection of the CATV relay amplifier sent through the TO, and the CATV relay amplifier. It is characterized in that it is composed of an HT equipped with means for sending out status.

[0007]

According to the above structure, the CATV relay amplifier on the CATV bidirectional transmission line distributes the signal transmitted from the HE.
In addition to the function of branching and responding by polling selection from the center, it has a status monitoring function for the HT and a function of holding the information sent from the HT in that case, while the HT is sent via the TO. It has the function of responding to the polling selection of the incoming CATV repeater amplifier and sends the status to the CATV repeater amplifier, so that the data transmission regarding the monitoring information between the HT and the CATV repeater amplifier becomes possible, and the CATV at the center.
The entire relay transmission line can be monitored.

[0008]

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

FIG. 1 is a block diagram of a CATV coaxial transmission system showing an embodiment of the present invention.

Information concerning monitoring / control is sent to the monitoring control device 2
Send from 0 to HE10. The information sent from the supervisory control device 20 and the signal received by the antenna installed in the center 30 are frequency-multiplexed by the HE 10 to CAT.
Send to V relay transmission line.

For example, the upstream band is 10 MHz to 50 MHz.
Assuming that the frequency is 70 MHz and the downstream band is 70 MHz to 450 MHz, the information about the monitoring and control multiplexed in HE10 is a CATV relay amplifier (TA, TDA, TBA, BA) in the 71.5 MHz FSK signal in the downstream band. 1
It is sent to 00-180. Each CATV relay amplifier 10
Each of the SMT units installed in 0 to 180 has a polling address, processes items related to monitoring and control only when they match the designation from the center 30, and if necessary, sends the information to the center in the upstream band. 18 MHz
The PSK signal is transmitted, and this is monitored by the center.

CAT having a branch terminal is similar to this.
V relay amplifier (TBA, BA) 150 and HT510-5
40 through TO200-500. The bidirectional transmission HTs 510 to 540 are preliminarily provided with a modem function so that information can be transmitted within the upstream band.

Information relating to monitoring and control is sent from the branch terminal of the CATV relay amplifier 150 to the HTs 510 to 540 via the TOs 200 to 500 as signals in the downstream band. HT510-540 installed in each recipient's house
Each has a polling address specified and CAT
Items related to monitoring and control are processed only when the specifications from the V relay amplifier 150 are met, and the information is transmitted as a signal in the upstream band if necessary, and this information is transmitted to the CATV.
It is held by the relay amplifier 150.

The HTs 510 to 10 installed in each signaler's house
HT monitoring / control information transmitted from the 540 through the TOs 200 to 500, and the above-mentioned respective CATVs.
Information on the supervisory control of the relay amplifier is held in the CATV relay amplifiers 100 to 180. Polling is performed from the center 30 and each CATV relay amplifier 100-1
Only when the polling address of the SMT unit installed in 80 matches the specified information, the information is sent to the center 30.
Then, the center 30 monitors and controls all the CATV relay transmission lines.

[0015]

As described above, the present invention is a CATV.
Since it is possible to monitor all of the relay transmission lines at the center, it is possible to quickly detect an abnormality at each recipient's house and to accurately grasp the failure point of the CATV relay transmission line.

[Brief description of drawings]

FIG. 1 is a block diagram of a CATV monitoring coaxial transmission system according to an embodiment of the present invention.

[Explanation of symbols]

 10 head end (HE) 20 supervisory control device 30 center 100 CATV relay amplifier 110 CATV relay amplifier 120 CATV relay amplifier 130 CATV relay amplifier 140 CATV relay amplifier 150 CATV relay amplifier 160 CATV relay amplifier 170 CATV relay amplifier 180 CATV relay amplifier 200 Tap Off (TO) 300 Tap Off (TO) 400 Tap Off (TO) 500 Tap Off (TO) 510 Home Terminal (HT) 520 Home Terminal (HT) 530 Home Terminal (HT) 540 Home・ Terminal (HT)

Claims (1)

[Claims] 1. A CATV bidirectional transmission system, comprising:
A supervisory control device for supervising and controlling the operating state of a TV relay amplifier, a head end HE for transmitting the information on the supervision and control output from the supervisory control device and a multi-channel TV signal to a CATV transmission path, and a transmission from the HE. It has a function of distributing and branching the generated signal, and a function of responding by polling selection from the center, a means for sending to the HE, and a status monitoring function for the home terminal HT and holding the sent information. CATV relay amplifier having a function, and the CATV
For the HT in the area covered by the relay amplifier, the CATV
Tap-off TO for branching the signal output from the relay amplifier to HT, and the CAT sent via the TO
The HT has a function of responding to polling selection of the V relay amplifier, and is composed of an HT having means for sending a status to the CATV relay amplifier.
ATV monitoring system.