JPH1141580A - Head end device for catv system - Google Patents

Head end device for catv system

Info

Publication number
JPH1141580A
JPH1141580A JP19255397A JP19255397A JPH1141580A JP H1141580 A JPH1141580 A JP H1141580A JP 19255397 A JP19255397 A JP 19255397A JP 19255397 A JP19255397 A JP 19255397A JP H1141580 A JPH1141580 A JP H1141580A
Authority
JP
Japan
Prior art keywords
signal
monitoring
unit
head end
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP19255397A
Other languages
Japanese (ja)
Inventor
Akira Arakawa
亮 荒川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miharu Communications Co Ltd
Original Assignee
Miharu Communications Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Miharu Communications Co Ltd filed Critical Miharu Communications Co Ltd
Priority to JP19255397A priority Critical patent/JPH1141580A/en
Publication of JPH1141580A publication Critical patent/JPH1141580A/en
Pending legal-status Critical Current

Links

Landscapes

  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To strengthen a supervision function of a unit device of a head end device. SOLUTION: Each of a re-transmission device such as an input branching device and a TV signal processor and a unit device 1 such as a TV modulator, a pilot signal generator, an output mixer and an output amplifier being components of the head end is provided with a signal, level supervisory function 2 that monitors a level of both or one of signals received and outputted and the head end is provided with a supervisory equipment 3 that monitors the normality of the unit device 1 based on information of the signal level detected by the signal level supervisory function 2 of the unit device 1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はCATVシステムの
ヘッドエンド装置に関するものであり、ヘッドエンド装
置を構成するユニット機器の異常を監視できるようにし
たものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-end device of a CATV system, and more particularly to an apparatus for monitoring an abnormality of a unit device constituting the head-end device.

【0002】[0002]

【従来の技術】CATVシステムのヘッドエンド装置は
図2に示されるように多数のユニット機器1で構成され
ている。これらユニット機器1には、アンテナの受信信
号をチャンネル毎のTV信号に分波する入力分波器1
1 、分波されたTV信号をCATVシステムの送信信号
に変換するTVシグナルプロセッサ(再送信装置)1
2 、パラボラアンテナ等で受信されてBSチューナやC
Sチューナから出力されるビデオ信号、VTR装置から
出力されるビデオ信号を変調してCATVシステムの送
信信号に変換するTV変調器13 、パイロット信号を発
生するPG発生器14、前記再送信装置12 やTV変調
器13 、PG発生器14 等から出力される送信信号を混
合する出力混合器15 、出力混合器15 の出力を幹線の
出力に適した信号に増幅する出力アンプ16 等がある。
2. Description of the Related Art As shown in FIG. 2, a head end device of a CATV system is composed of a number of unit devices 1. These unit devices 1 include an input demultiplexer 1 for demultiplexing a signal received by an antenna into a TV signal for each channel.
1. TV signal processor (retransmission device) 1 for converting the demultiplexed TV signal into the transmission signal of the CATV system
2. BS tuner or C received by parabolic antenna
Video signal output from the S tuner, TV modulator 1 3 which modulates the video signal outputted from the VTR apparatus for converting a transmission signal of a CATV system, PG generator 1 4 for generating a pilot signal, the retransmission device output amplifier for amplifying 1 2 and TV modulator 1 3, PG generator 1 4, etc. output mixer 1 5 for mixing the transmission signal output from the output of the output mixer 1 5 into a signal suitable for output of the mains There are 16 mag.

【0003】[0003]

【発明が解決しようとする課題】CATVシステムの従
来の監視装置には、幹線アンプの下り、上り信号レベ
ル、AC電圧、ヘッドエンド装置の出力信号を監視する
ものはあったが、ヘッドエンド装置におけるユニット機
器1を個別に監視する機能はなかった。これらヘッドエ
ンド機器の監視にそれほど気が使われてこなかったの
は、ヘッドエンド装置を構成するユニット機器が中継機
器のように様々な外的力を受ける屋外に設置されるもの
ではないということ、屋外に設置される中継機器のよう
にサイズ面での制約が少なく、より信頼性と耐久性の高
い設計ができるといったこと等にある。このためCAT
Vシステムの中継伝送網を構成する中継増幅器のステイ
タスモニタによる監視や中継伝送網での電源系統の監視
等に比べてユニット機器についての監視体制は貧弱であ
った。特に無人のヘッドエンドにおいては故障が発生す
ると作業員が現場に来て修理を終えるまでに時間がかか
ることも想定され、監視体制の強化が求められている。
Some conventional monitoring devices for the CATV system monitor the downstream and upstream signal levels of the main amplifier, the AC voltage, and the output signal of the head-end device. There was no function of individually monitoring the unit devices 1. What has not been used so much for monitoring these head-end devices is that the unit devices that make up the head-end devices are not installed outdoors subject to various external forces like relay devices, There are few restrictions on size, such as a relay device installed outdoors, and a design with higher reliability and durability can be made. Therefore, CAT
The monitoring system for the unit devices was poor compared to monitoring by a status monitor of a relay amplifier constituting a relay transmission network of the V system, monitoring of a power supply system in the relay transmission network, and the like. In particular, in the unmanned headend, if a failure occurs, it may take time for the worker to come to the site and complete the repair, and the monitoring system needs to be strengthened.

【0004】[0004]

【課題を解決するための手段】本発明のCATVシステ
ムのヘッドエンド装置は図1に示すように、CATVシ
ステムのヘッドエンドを構成する入力分波器、TVシグ
ナルプロセッサ等の再送信装置、TV変調器、パイロッ
ト信号発生装置、出力混合器、出力アンプ等のユニット
機器1の夫々に、夫々に入力される信号及び夫々から出
力される信号の双方又は一方のレベルを監視する信号レ
ベル監視機能2を設け、これらユニット機器1の信号レ
ベル監視機能2で検出される信号レベルの情報に基づい
てユニット機器1の正常/異常を監視する監視装置3を
設けたことを特徴とするものである。
As shown in FIG. 1, a head end device of a CATV system according to the present invention includes an input duplexer, a retransmitting device such as a TV signal processor, a TV signal processor, etc., which constitute a CATV system head end. Signal level monitoring function 2 for monitoring the level of both or one of the signal input to and the signal output from each of the unit devices 1 such as a unit, a pilot signal generator, an output mixer, and an output amplifier. In addition, a monitoring device 3 for monitoring the normal / abnormal of the unit device 1 based on the signal level information detected by the signal level monitoring function 2 of the unit device 1 is provided.

【0005】[0005]

【発明の実施の形態1】図1は本発明のCATVシステ
ムのへツドエンド装置の実施の形態を示したものであ
る。ヘッドエンド装置は、入力分波器1(11 )、TV
シグナルプロセッサ(再送信装置)1(12 )、TV変
調器(13 )、パイロット信号発生器(PG発生器)1
(14 )、出力混合器1(15 )、出力アンプ1(1
6 )の複数のユニット機器1で構成されている。本件発
明ではこれらへツドエンド装置を構成するユニット機器
1(11 、12 、・・・)の一つ一つに、 夫々に入力さ
れる信号と夫々から出力される信号のレベルを監視する
ための信号レベル監視機能2を設けてある。またこれら
信号レベル監視機能2と信号線10で接続させてヘッド
エンド装置内に監視装置3を設けてある。
FIG. 1 shows an embodiment of a head-end device of a CATV system according to the present invention. The head-end device includes an input demultiplexer 1 (1 1 ), a TV
Signal processor (retransmission apparatus) 1 (1 2), TV modulator (1 3), a pilot signal generator (PG generator) 1
(1 4 ), output mixer 1 (1 5 ), output amplifier 1 (1
6 ) It is composed of a plurality of unit devices 1. In the present invention, each of the unit devices 1 (1 1 , 1 2 ,...) Constituting the head-end device monitors the level of the signal input to each unit and the level of the signal output from each unit unit. Signal level monitoring function 2 is provided. Further, a monitoring device 3 is provided in the head end device by being connected to the signal level monitoring function 2 by a signal line 10.

【0006】前記各信号レベル監視機能2はユニット機
器1が扱う特定周波数の信号を信号入力側と信号出力側
の夫々で監視できるようにしてあり、 各側の信号レベル
が夫々所定の範囲内にあるかどうかを判別できるように
してある。そしてどちらか一方でも信号レベルが所定の
範囲内にない場合、レベル異常信号を出力する。入力分
波器11 や出力分波器15 のような複数チャンネルの信
号を扱う機器では、 所望の1チャンネルの信号について
監視するか、 或いは扱う帯域全体で信号の監視を行って
も良い。この実施形態の場合、入力分波器11 では入力
RF信号の有無を検出し、出力混合器15 では出力RF
信号の有無を検出するようにしてある。このような信号
レベル監視機能2が出力するレベル異常信号は信号線1
0を通じて監視装置3へと入力される。なお、TVシグ
ナルプロセツサ12 のような入出力信号の有無或いはレ
ベル異常を信号として外部出力できる接点を既に持つユ
ニット機器1の場合、その接点に信号線10を接続する
だけで信号レベルの監視を行うことができる。
Each of the signal level monitoring functions 2 enables a signal of a specific frequency handled by the unit device 1 to be monitored on each of the signal input side and the signal output side, and the signal level on each side is within a predetermined range. It is possible to determine whether there is. If either one of the signal levels is not within the predetermined range, a level abnormality signal is output. The device that handles signals of a plurality of channels, such as the input demultiplexer 1 1 and the output demultiplexer 1 5 may be performed to monitor the signal in the whole band or monitoring, or treat the desired 1-channel signal. In this embodiment, to detect the presence or absence of an input demultiplexer 1 1 the input RF signal, output mixer 1 5 in the output RF
The presence or absence of a signal is detected. The level abnormal signal output from the signal level monitoring function 2 is the signal line 1
0 is input to the monitoring device 3. Incidentally, TV signal pro-broken 1 For units apparatus 1 having already contacts that can be externally output as the presence or absence or level error signal, such output signal as 2, monitoring of the signal level by simply connecting the signal line 10 to the contact It can be performed.

【0007】前記監視装置3は多数の信号接続ポート1
1 を備えており、 各ポート11 に信号レベル監視機能2
からの信号線10が接続されている。この場合、監視装
置3は信号線10が接続されたポートの位置から、信号
接続ポート11 に入力される信号がどのユニット機器1
の信号レベル監視機能2からのものかを判断できるよう
になっている。この監視装置3では、信号レベル監視機
能2からレベル異常信号が入力されると、異常を起こし
たユニット機器1を識別して同ユニット機器1の異常を
外部に報知する。この報知は監視センタ内の監視ルーム
に対して行われ、監視センタが遠隔地にある場合は電話
回線や無線を通じて報知する。
The monitoring device 3 has a large number of signal connection ports 1
1 and each port 1 1 has a signal level monitoring function 2
Are connected. In this case, the monitoring device 3 is a signal line 10 from the connected position of the port, the signal connection port 1 1 which unit signals to be input to the device 1
Can be determined from the signal level monitoring function 2. In the monitoring device 3, when a level abnormality signal is input from the signal level monitoring function 2, the unit device 1 in which the abnormality has occurred is identified and the abnormality of the unit device 1 is notified to the outside. This notification is made to the monitoring room in the monitoring center, and when the monitoring center is at a remote location, the notification is made via a telephone line or wirelessly.

【0008】多くのヘッドエンド装置は図1に示したユ
ニット機器1以外にも多数のユニット機器を備えてお
り、近年はデータ通信のためのモデム等を備えているも
のもある。また双方向CATVシステムでは上り信号用
のユニット機器も備えている。本発明ではこれらの各種
ユニット機器にもレベル監視機能を設けることができ、
れらを監視装置2 と接続して監視対象とすることができ
る。
Many head-end devices include a large number of unit devices in addition to the unit device 1 shown in FIG. 1, and in recent years, some have a modem or the like for data communication. In addition, the bidirectional CATV system includes a unit device for an upstream signal. In the present invention, these various unit devices can be provided with a level monitoring function,
These can be connected to the monitoring device 2 to be monitored.

【0009】[0009]

【発明の効果】本発明のCATVシステムのヘッドエン
ド装置によれば次のような効果がある。 1.ヘッドエンド装置を構成するユニット機器について
個別に異常を監視することができる。 2.異常を起こしたユニット機器やチャンネルを判別で
きるようになるので異常が起きた際も、速やかに復旧対
策をとることができる。
According to the head end device of the CATV system of the present invention, the following effects can be obtained. 1. An abnormality can be individually monitored for the unit devices constituting the headend device. 2. Since it becomes possible to determine the unit device or channel in which the abnormality has occurred, even if an abnormality occurs, it is possible to quickly take a recovery measure.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明のCATVシステムのヘッドエンド装置
の実施の形態を示したブロック図。
FIG. 1 is a block diagram showing an embodiment of a head end device of a CATV system according to the present invention.

【図2】従来のCATVシステムのヘッドエンド装置を
示したブロック図
FIG. 2 is a block diagram showing a head end device of a conventional CATV system.

【符号の説明】[Explanation of symbols]

1 ユニット機器 2 信号レベル監視機能 3 監視装置 1 unit equipment 2 signal level monitoring function 3 monitoring device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】CATVシステムのヘッドエンドを構成す
る入力分波器、TVシグナルプロセッサ等の再送信装
置、TV変調器、パイロット信号発生装置、出力混合
器、出力アンプ等のユニット機器(1)の夫々に、夫々
に入力される信号及び夫々から出力される信号の双方又
は一方のレベルを監視する信号レベル監視機能(2)を
設け、これらユニット機器(1)の信号レベル監視機能
(2)で検出される信号レベルの情報に基づいてユニッ
ト機器(1)の正常/異常を監視する監視装置(3)を
設けたことを特徴とするCATVシステムのヘッドエン
ド装置。
1. A unit equipment (1) such as an input duplexer, a retransmission device such as a TV signal processor, a TV modulator, a pilot signal generation device, an output mixer, and an output amplifier which constitute a head end of a CATV system. Each of them has a signal level monitoring function (2) for monitoring the level of one or both of the signal input to and the signal output from each, and the signal level monitoring function (2) of these unit devices (1) provides A head end device for a CATV system, comprising a monitoring device (3) for monitoring whether the unit device (1) is normal or abnormal based on information on a detected signal level.
JP19255397A 1997-07-17 1997-07-17 Head end device for catv system Pending JPH1141580A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19255397A JPH1141580A (en) 1997-07-17 1997-07-17 Head end device for catv system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19255397A JPH1141580A (en) 1997-07-17 1997-07-17 Head end device for catv system

Publications (1)

Publication Number Publication Date
JPH1141580A true JPH1141580A (en) 1999-02-12

Family

ID=16293204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19255397A Pending JPH1141580A (en) 1997-07-17 1997-07-17 Head end device for catv system

Country Status (1)

Country Link
JP (1) JPH1141580A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008177804A (en) * 2007-01-18 2008-07-31 Hochiki Corp Switching controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008177804A (en) * 2007-01-18 2008-07-31 Hochiki Corp Switching controller

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