JPS61167233A - Self-diagnosing circuit of two-way catv relay amplifier - Google Patents
Self-diagnosing circuit of two-way catv relay amplifierInfo
- Publication number
- JPS61167233A JPS61167233A JP60007128A JP712885A JPS61167233A JP S61167233 A JPS61167233 A JP S61167233A JP 60007128 A JP60007128 A JP 60007128A JP 712885 A JP712885 A JP 712885A JP S61167233 A JPS61167233 A JP S61167233A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- pilot
- frequency
- low
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
- H04B17/401—Monitoring; Testing of relay systems with selective localization
- H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
- H04B17/403—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local oscillators
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、下り信号用中継増幅器と」ユリ信号用中継増
幅器とを方向性濾波器によって結合して線路中に挿入接
続した双方向CATV中継増幅器に関し、特にその」ユ
リ信号用低域増幅器を常時監視するための自己診断回路
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bidirectional CATV repeater amplifier in which a downlink signal repeater amplifier and a lily signal repeater amplifier are combined by a directional filter and inserted into a line. In particular, the present invention relates to a self-diagnosis circuit for constantly monitoring the low-frequency amplifier for the Yuri signal.
発明の概要
本発明は、下り信号用中継増幅器と上り信号用中継増幅
器とを方向性濾波器によって結合して線路中に挿入接続
した双方向CATV中継増幅器において、
−1:り信号の帯域外周波数を使用して上り信号用低域
増幅器の利得を常時監視し、上り信号用低域増幅器の異
常を検出したときは上り信号の帯域内であって各中継器
固有の状態監視信号を線路へ送出することにより、
上り信号用低域増幅器を常時監視し、その異常をセンタ
に通知できるようにしたものである。Summary of the Invention The present invention provides a bidirectional CATV relay amplifier in which a downstream signal relay amplifier and an upstream signal relay amplifier are combined by a directional filter and inserted into a line. It constantly monitors the gain of the low-band amplifier for upstream signals using This makes it possible to constantly monitor the upstream signal low-band amplifier and notify the center of any abnormalities.
従来技術
従来、下り信号用中継増幅器と上り信号用中継増幅器と
を方向性濾波器によって結合して線路中に挿入接続した
双方向CATV中継増幅器において、各中継器に対して
それぞれあらかじめ割当てられた固有周波数を発振する
監視用信号発生器を設けておき、一方、上り、下り信号
にはそれぞれセンタまたはセンタから最遠端の端末から
送出されたパイロット信号が挿入されており、上り、下
り増幅器はそれぞれ上記パイロットによってぬAGCを
動作させ、利得低下環の異常が発生したときは、前記固
有周波数の状態監視信号に低周波変調をかけること等に
よってセンタに通知するようにしている。Prior Art Conventionally, in a bidirectional CATV relay amplifier in which a downstream signal relay amplifier and an upstream signal relay amplifier are combined by a directional filter and inserted into a line, a unique A monitoring signal generator that oscillates a frequency is provided, and a pilot signal sent from the center or the farthest terminal from the center is inserted into the upstream and downstream signals, respectively. When an abnormality occurs in the gain reduction ring by operating the AGC not based on the pilot, the center is notified by applying low frequency modulation to the condition monitoring signal of the natural frequency.
ところで、CATVシステムは一般に樹枝状網に構成さ
れており、すべての端末からの」ユリ方向信号はセンタ
に集中する。従って、枝別れした分岐先の端末から送出
したパイロット信号は、幹線に流入しないように幹線に
合流前にパイロット・リジェクト−フィルタを用いて遮
断する必要がある。このため、従来の双方向CATV中
継増幅器では、上記パイロット・リジェクト・フィルタ
によって伝送信号が劣化するという欠点がある。Incidentally, a CATV system is generally configured as a dendritic network, and directional signals from all terminals are concentrated at a center. Therefore, it is necessary to use a pilot reject filter to block the pilot signal sent from the branched terminal before merging into the main line so that it does not flow into the main line. Therefore, the conventional bidirectional CATV repeater amplifier has the disadvantage that the pilot reject filter degrades the transmitted signal.
パイロット信号を用いないで、例えばサーマルAGCを
用いた中継器もあるが、上り方向信号は常時伝送されて
いるわけではないので、常時中継器の監視を行なうこと
ができなくなる。There are repeaters that do not use pilot signals, for example, using thermal AGC, but since uplink signals are not always transmitted, it becomes impossible to constantly monitor the repeater.
また、下り信号用高域増幅部を監視するために、下り信
号用高域増幅器のダウン時に上り監視用信号発生器から
上り方向へ監視信号を送出して、センタで異常を判別で
きるようにした方式もあるが、この場合は、低域増幅器
の状態監視をすることができず、さらには、監視信号の
断が低域増幅器のダウンによるものか又は電源系ダウン
によるものかを区別することができない。In addition, in order to monitor the high-band amplifier for downlink signals, when the high-band amplifier for downlink signals goes down, the uplink monitoring signal generator sends out a monitoring signal in the upstream direction, allowing the center to identify abnormalities. There is also a method, but in this case, it is not possible to monitor the status of the low-frequency amplifier, and furthermore, it is not possible to distinguish whether the interruption of the monitoring signal is due to the low-frequency amplifier going down or the power supply system going down. Can not.
発明の目的
本発明の目的は、上述の従来の欠点を解決し、パイロッ
ト−リジェクト・フィルタを使用しないで、上り信号用
低域増幅器の状態を常時監視できるようにした双方向C
ATV中継増幅器の自己診断回路を提供することにある
。OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional drawbacks and to provide a bidirectional C which can constantly monitor the status of a low-pass amplifier for upstream signals without using a pilot-reject filter.
An object of the present invention is to provide a self-diagnosis circuit for an ATV relay amplifier.
発明の構成
本発明の双方向CATV中継増幅器の自己診断回路は、
下り信号用高域増幅器と上り信号用低域増幅器とを方向
性濾波器によって結合して線路中に挿入接続した双方向
CATV中継増幅器において、
前記方向性濾波器の上り信号通過帯域外の周波数のパイ
ロット信号を発生して前記上り信号用低域増幅器の入力
に挿入する低域増幅器監視用パイロット発生器と、
前記上り信号用低域増幅器の出力から前記低域増幅器監
視用パイロット発生器の出力するパイロット信号を分離
抽出してそのレベル異常を検出する検出器と、
上り信号帯域内であって中継器ごとに割当てられた固有
周波数の状態監視信号を発生する状態監視信号発生器と
、
前記検出器の異常検出出力によって前記状態監視信号を
前記方向性濾波器を介して線路へ送1t1する状態監視
信弓送出器とを備えたことを特徴とする。Structure of the Invention The self-diagnosis circuit of the bidirectional CATV relay amplifier of the present invention is as follows:
In a bidirectional CATV relay amplifier in which a high-band amplifier for downlink signals and a low-band amplifier for uplink signals are combined by a directional filter and inserted into a line, a low-pass amplifier monitoring pilot generator that generates a pilot signal and inserts it into the input of the upstream signal low-pass amplifier; and an output of the low-pass amplifier monitoring pilot generator from the output of the upstream signal low-pass amplifier. a detector that separates and extracts a pilot signal and detects a level abnormality therein; a condition monitoring signal generator that generates a condition monitoring signal of a unique frequency within the uplink signal band and assigned to each repeater; and the detector. and a condition monitoring transmitter for transmitting the condition monitoring signal 1t1 to the line via the directional filter based on the abnormality detection output.
発明の実施例
次に、本発明について、図面を参照して詳細に説明する
。Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.
図は、本発明の一実施例を示すブロック図である。すな
わち、下り信号用高域増幅器1と上り信号用低域増幅器
2とを方向性濾波器3,4によって結合して線路端子1
2と13を線路に挿入接続し、センタから線路端子12
に入力された下り方向の信号は方向性濾波器3を通して
下り信号用高域増幅器lに入力され、ここで増幅されて
方向性濾波器4を通して線路端子13から端末方向へ送
出される。端末方向から線路端子13に入力された上り
方向の信号は、方向性濾波器4を通して上り信号用低域
増幅器2に入力され、ここで増幅されて方向性濾波器3
を通して線路端子12からセンタ側へ送出される。The figure is a block diagram showing one embodiment of the present invention. That is, the high-band amplifier 1 for downlink signals and the low-band amplifier 2 for uplink signals are coupled by directional filters 3 and 4, and the line terminal 1
Insert and connect 2 and 13 to the track, and connect the line terminal 12 from the center.
The downlink signal input to is inputted to the downlink signal high frequency amplifier l through the directional filter 3, where it is amplified and sent out through the directional filter 4 from the line terminal 13 toward the terminal. The upstream signal input from the terminal direction to the line terminal 13 is input to the upstream signal low-pass amplifier 2 through the directional filter 4, where it is amplified and sent to the directional filter 3.
It is sent out from the line terminal 12 to the center side through the line.
低域増幅器監視用パイロット発生器8は、方向性濾波器
3の」−り低域信号通過帯域外の周波数のパイロット信
号を発生して、方向性結合器5を介して上り信号用低域
増幅器2の入力に挿入する。The low-pass amplifier monitoring pilot generator 8 generates a pilot signal with a frequency outside the low-pass signal passband of the directional filter 3 and passes it through the directional coupler 5 to the upstream signal low-pass amplifier. Insert into the input of 2.
上り信号用低域増幅器2の出力は方向性結合器6で分岐
されて検出器lOに入力され、ここで前記パイロット信
号が分離抽出されて基準レベルと比較ごれてレベルチェ
ックされる。パイロットレベルと基準レベルとの差が一
定値以上であるときは。The output of the upstream signal low-band amplifier 2 is branched by a directional coupler 6 and input to a detector 1O, where the pilot signal is separated and extracted and compared with a reference level for level checking. When the difference between the pilot level and the reference level is more than a certain value.
検出器lOから異常検出信号が状態監視信号送出器11
に送られる。一方、低域増幅器監視用パイロット発生器
8の出力が分周器9によって分周されて、上り信号帯域
内であって当該中継増幅器固有の周波数の状態監視信号
に変換されて状態監視信号送出器11に入力されている
。状態監視信号送出器11は、前記異常検出信号が入力
されると、上記状態監視信号を出力し、方向性結合器7
を介して上り信号に挿入し、方向性濾波器3を通して線
路端子12からセンタへ送出する。従って、低域増幅器
の断時にも状態監視信号を送出することか可能であり、
電源断と区別することが可能である。An abnormality detection signal is sent from the detector IO to the status monitoring signal transmitter 11
sent to. On the other hand, the output of the low-band amplifier monitoring pilot generator 8 is frequency-divided by a frequency divider 9 and converted into a status monitoring signal with a frequency specific to the relay amplifier within the upstream signal band, and then sent to a status monitoring signal transmitter. 11 is input. When the abnormality detection signal is input, the condition monitoring signal transmitter 11 outputs the condition monitoring signal, and the directional coupler 7
It is inserted into the upstream signal via the directional filter 3 and sent from the line terminal 12 to the center. Therefore, it is possible to send out a status monitoring signal even when the low-band amplifier is disconnected.
It is possible to distinguish this from a power outage.
本実施例においては、低域増幅器監視用パイロット発生
器8と分周器9とで、状態監視信号発生器を構成し、分
周器9の分周比によって各中継器固有の周波数を発生さ
せているが、状態監視信号発生器は各中継増幅器ごとに
個別の発振器を使用してもよいことは勿論である。In this embodiment, a low-band amplifier monitoring pilot generator 8 and a frequency divider 9 constitute a condition monitoring signal generator, and a frequency unique to each repeater is generated by the frequency division ratio of the frequency divider 9. However, it goes without saying that the condition monitoring signal generator may use a separate oscillator for each relay amplifier.
発明の効果
以上のように、本発明においては、上り信号の帯域外の
周波数を使用して常時上り信号用低域増幅器の利得を監
視し、異常時には上り信号の対域内周波数であって各中
継増幅器固有の状態監視信号をセンタへ送出するように
構成したから、パイロット・リジェクト・フインレタを
使用しないで、従って上り伝送信号の劣化を生じないで
、常時上り信号用低域増幅器の状態を監視することがで
きるという効果がある。Effects of the Invention As described above, in the present invention, the gain of the low-frequency amplifier for uplink signals is constantly monitored using a frequency outside the band of uplink signals, and when an abnormality occurs, the gain of the low-frequency amplifier for uplink signals is Since the configuration is configured to send a status monitoring signal specific to the amplifier to the center, the status of the low-band amplifier for upstream signals can be constantly monitored without using a pilot reject filter and therefore without causing deterioration of the upstream transmission signal. It has the effect of being able to
図は本発明の一実施例を示すブロック図である。
図において、1:下り信号用高域増幅器、2ニ一トリ信
号用低域増幅器、3,4二方向性濾波器、5〜7:方向
性結合器、8:低域増幅器監視用パイロット発生器、9
:分周器、lO:検出器、11:状態監視信号送出器、
12,13:線路端子。The figure is a block diagram showing one embodiment of the present invention. In the figure, 1: high-frequency amplifier for downstream signals, 2: low-frequency amplifier for two-way signals, 3, 4 bidirectional filters, 5 to 7: directional coupler, 8: pilot generator for monitoring low-frequency amplifiers. ,9
: Frequency divider, lO: Detector, 11: Status monitoring signal transmitter,
12, 13: Line terminals.
Claims (1)
性濾波器によつて結合して線路中に挿入接続した双方向
CATV中継増幅器において、前記方向性濾波器の上り
信号通過帯域外の周波数のパイロット信号を発生して前
記上り信号用低域増幅器の入力に挿入する低域増幅器監
視用パイロット発生器と、 前記上り信号用低域増幅器の出力から前記低域増幅器監
視用パイロット発生器の出力するパイロット信号を分離
抽出してそのレベル異常を検出する検出器と、 上り信号帯域内であつて中継器ごとに割当てられた固有
周波数の状態監視信号を発生する状態監視信号発生器と
、 前記検出器の異常検出出力によつて前記状態監視信号を
前記方向性濾波器を介して線路へ送出する状態監視信号
送出器とを備えたことを特徴とする双方向CATV中継
増幅器の自己診断回路。[Scope of Claims] A bidirectional CATV repeating amplifier in which a high-band amplifier for downlink signals and a low-band amplifier for uplink signals are combined by a directional filter and inserted and connected into a line, wherein the directional filter a low-pass amplifier monitoring pilot generator that generates a pilot signal with a frequency outside the upstream signal passband and inserts it into the input of the upstream signal low-pass amplifier; A detector that separates and extracts the pilot signal output from the monitoring pilot generator and detects level abnormalities, and a status monitor that generates a status monitoring signal with a unique frequency that is within the uplink signal band and is assigned to each repeater. A two-way CATV relay comprising: a signal generator; and a condition monitoring signal transmitter that transmits the condition monitoring signal to the line via the directional filter based on the abnormality detection output of the detector. Amplifier self-diagnosis circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60007128A JPS61167233A (en) | 1985-01-18 | 1985-01-18 | Self-diagnosing circuit of two-way catv relay amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60007128A JPS61167233A (en) | 1985-01-18 | 1985-01-18 | Self-diagnosing circuit of two-way catv relay amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61167233A true JPS61167233A (en) | 1986-07-28 |
Family
ID=11657438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60007128A Pending JPS61167233A (en) | 1985-01-18 | 1985-01-18 | Self-diagnosing circuit of two-way catv relay amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61167233A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6349882U (en) * | 1986-09-17 | 1988-04-04 | ||
EP0539224A2 (en) * | 1991-10-24 | 1993-04-28 | Japan Radio Co., Ltd | Detection of amplifier failure |
JP2003199067A (en) * | 2001-12-26 | 2003-07-11 | Miharu Communications Co Ltd | Amplifier for catv |
-
1985
- 1985-01-18 JP JP60007128A patent/JPS61167233A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6349882U (en) * | 1986-09-17 | 1988-04-04 | ||
JPH0514624Y2 (en) * | 1986-09-17 | 1993-04-19 | ||
EP0539224A2 (en) * | 1991-10-24 | 1993-04-28 | Japan Radio Co., Ltd | Detection of amplifier failure |
US5313657A (en) * | 1991-10-24 | 1994-05-17 | Japan Radio Co., Ltd. | Receiver capable of reliably detecting a failure |
JP2003199067A (en) * | 2001-12-26 | 2003-07-11 | Miharu Communications Co Ltd | Amplifier for catv |
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