KR940006732B1 - Catv apparatus - Google Patents

Abstract

The trunk station state monitoring apparatus and method comprises: a head end having a broadcasting video signal source for storing a program, etc., a first modem for modulating the output signal of the signal source, a high frequency combiner for preventing mutual interference of each signal, a computer for exchanging data, and a second modem; and a trunk station having a duplexer filter for separating a channel, a state monitoring unit for monitoring the trunk station, an automatic gain slope controller for automatically adjusting a gain and a slope, a forward amplifier, a branch amplifier, a bridging amplifier, and a reverse amplifier for amplifying a signal generated from a subscriber, thereby increasing the efficiency of management in a CATV system.

Description

CATV trunk line status monitoring device and method

1 is a general CATV system configuration diagram.

2 is a configuration diagram of a conventional CATV head end system and trunk line system.

3 is a block diagram of the head end system and the trunk line system according to the present invention.

4 is a detailed circuit diagram of the state monitoring device in FIG.

5 is a flow chart according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: broadcast video signal source 2: first modem

3: second modem 4: computer

5: high frequency combiner 6: diplex filter

7: AGSC 8: Switching Power

11 forward amplifier 12 reverse amplifier

13: branch amplifier 14: branch amplifier

15: phase xo monitoring device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV (Community Antenna Television CATV) system. In particular, a computer of a headend system in each part of a trunk amplifier is used for exchanging data between a headend system and a trunk station. An apparatus and a method for remotely checking the status of a device are disclosed.

FIG. 1 is a schematic diagram of a general CATV system, in which a receiver 10 for receiving a TV signal and an FM signal through an antenna and a headend system 30 for inputting signals from a self-produced independent broadcasting system 20 are used as transmission paths. Send data. Trunk system 40 for inputting the data of the head-end system 30 through the transmission path is installed at regular intervals in the trunk to compensate for the loss of the trunk cable and to relay the signal over a long distance.

The distribution system 50 for inputting the data transmitted from the trunk line 40 through the trunk line distributes the trunk line signal to the subscriber 60 along the channel.

The subscriber 60 refers to a device having additional functions such as a television receiver to reproduce on a CRT.

2 is a block diagram of a conventional headend system and trunk line system. The headend system A includes a program source 1 for outputting a wireless TV program signal or a program signal by independent broadcasting, and the program source 1. A modem (2) for inputting and demodulating the program signal outputted from the subscriber, and receiving and demodulating and outputting a signal from the subscriber, a computer (4) connected to the modem (2), and the computer (4); It consists of a high frequency combiner 5 for inputting the output signal of the modem 2 to prevent interference between the output signals of each signal and to improve the separation characteristics for each channel.

The trunk line B separates the channel of the output signal of the high frequency combiner 5 and outputs it to the forward amplifier 11, and separates the channel of the lifted control signal from the subscriber to the high frequency combiner 5. ), A diplexing filter (6) outputting the power supply, switching power (8) for converting the supplied AC power into a DC power supply to the forward amplifier (11), and a signal separated from the diplex filter (6). A forward amplifier 11 for amplifying and outputting, an AGSC (Automatic Gain S1ope Control) 7 connected to the forward amplifier 11 for automatically adjusting gain and SLOPE, and the forward direction A branch amplifier 13 for inputting an output signal of the amplifier 11 to branch and amplify a part of the signal, and amplifying a signal from the subscriber to the computer 4 of the headend system A and diplexing the filter 6. It consists of a reverse amplifier 12 for outputting.

The operation based on the above configuration is as follows.

The program source 1 outputs a wireless TV program or a program by independent broadcasting. The signal output from the program source 1 is modulated and output through the modem 2. The high frequency combiner 5, which inputs the modulated signal from the modem 2, prevents the interference between the signals and improves the separation characteristics for each channel. The diplex filter 6 for inputting the output signal of the high frequency combiner 5 separates and outputs the channel.

At this time, the forward amplifier 11 amplifies and outputs the output signal of the diplex filter 6 by a signal for adjusting gain and SLOPE which are outputs of the AGSC 7. The branch amplifier 13 which receives the amplified signal of the forward amplifier 11 as an input branch outputs the input signal to the subscriber.

In addition, the reverse amplifier 12 which inputs the control signal by the subscriber amplifies the control signal by the subscriber and outputs it to the diplex filter 6. As a result, the diplex filter 6 separates and outputs a communication channel capable of communication between the subscriber and the headend system A. FIG. The high frequency combiner 5, which inputs the signal of the channel separated from the diplex filter 6, outputs with good channel characteristics.

The modem 2 which inputs the output signal of the high frequency combiner 5 demodulates the input signal and outputs it to the computer 4 which is a system manager.

In the conventional CATV system as described above, since the trunk amplifier in the trunk system B only transmits the signal transmitted from the headend system A to the amplification distribution system, it is inconvenient to check the system status frequently in the system operation, and remotely. There was an uncomfortable problem of checking the status or checking several systems at the same time, and finding out the failure part by checking the whole system in case of failure.

Therefore, an object of the present invention is to check the system status from time to time by remotely checking the state of each part of the trunk line system to prevent failure, and monitor the state of the trunk line to quickly deal with any abnormality. And providing a method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

3 is a block diagram according to the present invention, and includes a head end system (Cable Head and Antenna).

End) (A) and trunk station (B).

The head end system (A) is a broadcast video signal source (1) for storing a wireless TV program or a program by independent broadcasting, and a first modem for modulating and outputting a signal output from the broadcast video signal source (1). (2), a high frequency combiner (5) for receiving a modulated signal from the first modem (2) to prevent mutual interference of each signal and to improve separation characteristics for each channel, and the trunk line (B) And the computer 4 for data exchange, and the signal output from the computer 4 to modulate and output the signal to the high frequency combiner 5, and demodulate the signal input from the trunk line B. It consists of the 2nd modem 3 output to (4).

Meanwhile, the trunk line B may include a diplex filter 6 separating a channel to enable communication between the headend system A and a subscriber, and a signal separated from the diplex filter 6 to input a channel separated signal. A state monitoring device 15 that monitors the entire system of the trunk line B, an AGSC 7 connected to the state monitoring device 15 to automatically adjust gain and slow, and the state monitoring device 15 Is connected to the switching wave 9 for converting the input AC power into DC power, and the diplex filter 6 and the state monitoring device 15, respectively, to separate the channel from the diplex filter 6. A forward amplifier 11 for amplifying and outputting a signal, a branch amplifier 13 for branching and amplifying the output signal of the forward amplifier 11, and a branch for branching and amplifying the signal amplified from the branch amplifier 13; An amplifier 14 and a signal generated from the subscriber Amplified consists of a reverse amplifier 12 for output to the die flex filter 6.

4 is a detailed circuit diagram of the state monitoring device 15 in FIG. 3, which includes a state signal detection unit 41 for generating a signal transmission state and a function check state signal of the current trunk line B, and the state signal detection unit 41. FIG. A microprocessor 42 which is the main controller of the state monitoring device 15 according to a predetermined program and an output signal state of the state signal detection unit 41, and a RAM 43 that temporarily stores data processed during the state monitoring. And an e-pyrom 45 for enabling address input and address conversion, and a rom 44 for storing a program for monitoring the trunk state.

5 is a flowchart according to the present invention, which comprises a first step of formatting and transmitting input data to an address, a function, and an end of a message in the computer 4 of the head-end system A, and monitoring state status in the first step. A second process of receiving data formatted and transmitted from the device 15 in the trunk line B and checking a password to determine whether the received data is its own address; and in the second process, the received data A third step of collecting data from the state monitoring device l5 of the trunk line system B at an address date and time and then formatting the address, function, and end of the message to transmit data to the headend system A; In a third process, the fourth process of receiving data formatted from the transmission system B by the headend system A, analyzing, classifying, and outputting the data is performed.

The present invention will be described in detail based on the above configuration.

The present invention is to install a personal computer (4) in the head-end system (A) and connected between the computer (4) and the trunk system (B) via a second modem (3) of a certain protocol according to the state of each other The shape was determined so that the computer 4 of the headend system A could input the address of the trunk line B to analyze the data in software.

In step (A1) of FIG. 5, the address of the trunk line B to be monitored is input by a central processing unit (not shown) of the computer 4 in the headend system A, and in step A2, the address is input. In order to be able to communicate with the state monitoring device 15 of the trunk line (B) is formatted in a certain protocol. At this time, the message type of the protocol consists of an address, a function, and a part indicating the end of the message, and the function includes a necessary state check request data of the trunk line B. The formatted data is sent to the trunk line B through a data transfer process in step (A3).

At this time, the microprocessor 42 of the state monitoring device 15 embedded in the trunk amplifier B receives the formatted data in step (B1) and performs a data analysis process of the system manager (B2). After confirming the password of (4), in step (B3), it compares its own address with the address of the received data to find out whether it is calling itself. At this time, if it is not its own address (B8), it proceeds to the reception standby state so that new data can be received. However, when it is called, the heteroend system (A) determines the desired monitoring collection item in step (B4) and collects data by the microprocessor 42 in step (B5). Here, the collected data is formatted into a part indicating an address, a function, and an end of a message as in the headend system A in step (B6), and the data is transmitted to the headend system (A) in step (B7). The function comprises the status check result data of the trunk line B. The central processing unit of the computer 4 of the double headend system A receives this data in step (A4), analyzes the data in step (A5), and classifies the data again in step (A6) ( After outputting or storing the data in step A7), the process returns to step (A1) for input of the next address.

This pyrom 45 is kept at its address as shown in FIG.

The reason for using the Y pyrom 45 is not only to allow the computer 4, which is a system manager, to modify the address, but also to preserve data in the event of power loss.

As described above, it is possible to remotely monitor the situation of various trunk systems in real time by enabling communication between the remote headend system and the trunk system in real time, thereby preventing failure in advance. As the system can be easily found, not only can it cope quickly, but also it can be expected to increase the management efficiency of the CATV system by keeping various data.

Claims (2)

In a CATV system having a headend system (A) for transmitting a reception system and an independent broadcasting system signal, and a trunk line (B) for delivering a signal transmitted from the headend system (A) to a subscriber through a distribution system. A broadcast video signal source (1) for storing wireless TV programs or programs by independent broadcasting; a first modem (2) for modulating and outputting signals output from the broadcast video signal source (1); A computer for data exchange with the trunk system (B) and a high frequency combiner (5) for receiving a modulated signal from a modem (2) to prevent mutual interference of each signal and to improve separation characteristics for each channel. (4), and modulating the signal output from the computer (4) and outputting it to the high frequency combiner (5), demodulating the signal input from the trunk line (B) and outputting it to the computer (4). Between the modem 3 and the headend system A and the subscriber. A diplex filter 6 for separating channels so that communication is possible, and a state monitoring device 15 for inputting a signal separated from the diplex filter 6 to monitor the entire system of the trunk line B; And an AGSC (7) connected to the state monitor (15) to automatically adjust gain and slow, and the diplex filter (6) connected to the diplex filter (6) and the state sensor (15), respectively. A forward amplifier (11) for amplifying and outputting a signal separated from the channel), a branch amplifier (13) for branching and amplifying the output signal of the forward amplifier (11), and a signal amplified from the branch amplifier (13). And a branch amplifier (14) for branching and amplifying, and a reverse amplifier (12) for amplifying the signal generated from the subscriber and outputting the signal to the diplex filter (6). In the CATV system having a head end system 4 including a data input / output computer 4 and a trunk system B including a state monitor value for checking the state of the trunk line, the head end system A is provided. A first process of formatting and transmitting input data to an address, a function, and an end of a message in the computer 4 of the computer 4, and a data trunk B formatted and transmitted from the state monitor 15 in the first process. A second step of determining whether the received data is its own address by checking the password after receiving the received data, and the data in the state sensing device 15 of the trunk line B when the received data is its own address in the second step. Collecting the data and formatting the address, function, and end of the message to transmit data to the headend system (A); and in the third process, the data formatted from the transmission system (B) to the headend system. (A) Receive and analyze in minutes And outputting the main CATV system status monitoring method of claim 4 constituted by any process.

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