JP2518307B2 - CATV level automatic variable system - Google Patents

CATV level automatic variable system

Info

Publication number
JP2518307B2
JP2518307B2 JP62236928A JP23692887A JP2518307B2 JP 2518307 B2 JP2518307 B2 JP 2518307B2 JP 62236928 A JP62236928 A JP 62236928A JP 23692887 A JP23692887 A JP 23692887A JP 2518307 B2 JP2518307 B2 JP 2518307B2
Authority
JP
Japan
Prior art keywords
level
unit
catv
main line
center
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.)
Expired - Lifetime
Application number
JP62236928A
Other languages
Japanese (ja)
Other versions
JPS6480188A (en
Inventor
靖司 濱田
均 吉沢
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.)
NEC Corp
Original Assignee
Nippon Electric 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 Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Priority to JP62236928A priority Critical patent/JP2518307B2/en
Publication of JPS6480188A publication Critical patent/JPS6480188A/en
Application granted granted Critical
Publication of JP2518307B2 publication Critical patent/JP2518307B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 産業上の利用分野 本発明は双方向CATV伝送システムに関し、特にセンタ
において下り帯域の信号レベルを調整するためのCATVレ
ベル自動可変方式に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional CATV transmission system, and more particularly to a CATV level automatic variable system for adjusting a signal level of a downlink band in a center.

従来の技術 従来、この種の双方向CATV伝送システムは、CATV各チ
ャンネルの下り帯域信号発生器,上り帯域受信部,方向
性波器およびポーリング・セレクティング制御部とを
有するセンタと、このセンタに接続し複数の幹線増幅器
を直列に中継接続する幹線と、この幹線から分岐する分
岐増幅器および加入者端末とからなるものであり、下り
帯域の信号レベルの調整は、幹線末端などにある幹線増
幅器のモニタ端子から下り帯域の信号を測定して、各チ
ャンネル間の信号レベルの偏差が最小になるように、セ
ンタの下り帯域信号発生器の出力を調整するようにして
いた。
2. Description of the Related Art Conventionally, a bidirectional CATV transmission system of this type has a center having a downlink band signal generator for each CATV channel, an upstream band receiving unit, a directional wave unit, and a polling / selecting control unit, and this center. It consists of a trunk line that connects and relays a plurality of trunk line amplifiers in series, and a branch amplifier and a subscriber terminal that branch off from this trunk line. The signal of the down band is measured from the monitor terminal, and the output of the down band signal generator at the center is adjusted so that the deviation of the signal level between the channels is minimized.

しかしながら、幹線増幅器は一般に電柱上などに装着
されているため、そのモニタ端子に直接測定器を接続し
てレベル測定を行うためには、工事用のバケット車等の
準備が必要になるという欠点があった。さらに必要とさ
れる測定点は、一般に多段中継される幹線増幅器の最遠
点であり、センタからの距離が遠いためその作業が容易
でなく、かつセンタでの出力レベルの調整は、その後の
作業となるので、時間と手間とが大いに掛るという欠点
があった。
However, since the main line amplifier is generally mounted on a utility pole or the like, in order to connect a measuring device directly to the monitor terminal and perform level measurement, it is necessary to prepare a bucket car or the like for construction. there were. Furthermore, the required measurement point is generally the farthest point of the trunk amplifier that is multi-stage relayed, and the work is not easy because the distance from the center is long. Therefore, there is a drawback that it takes much time and labor.

発明が解決しようとする問題点 本発明の目的は、上記の欠点、すなわち下り帯域の信
号レベルの偏差を調整するために多大の手間と時間とが
掛るという問題点を解決したCATVレベル自動可変方式を
提供することにある。
Problems to be Solved by the Invention An object of the present invention is to solve the above-mentioned drawback, that is, the CATV level automatic variable system which solves the problem that it takes a lot of time and effort to adjust the deviation of the signal level of the downlink band. To provide.

問題点を解決するための手段 本発明は上述の問題点を解決するために、少なくと
も、センタと、幹線と、幹線増幅器とを有するCATV伝送
システムにおいて、幹線の端末などにある幹線増幅器に
接続され、入出力端子と、方向性波器と、ポーリング
セレクティングによって順次測定周波数を指定する制御
信号を受信する制御信号受信部と、この制御信号受信部
に接続するレベル測定部と、この出力レベルを上り回線
に送出するデータ送出部とを有するCATV用レベル監視装
置を設け、またセンタに下り帯域信号発生部と、レベル
監視装置からのデータ信号を受信する上り帯域受信部
と、この受信部の出力によって下り帯域信号発生部の出
力レベルを可変させるレベル可変制御部とを設ける構成
を採用するものである。
Means for Solving the Problems In order to solve the above problems, the present invention provides a CATV transmission system having at least a center, a main line, and a main line amplifier, which is connected to a main line amplifier in a main line terminal or the like. , The input / output terminal, the directional wave device, the control signal receiving unit that receives the control signal that sequentially specifies the measurement frequency by polling selection, the level measuring unit connected to this control signal receiving unit, and the output level A CATV level monitoring device having a data sending unit for sending to the uplink is provided, a downlink band signal generating unit at the center, an uplink band receiving unit for receiving a data signal from the level monitoring device, and an output of this receiving unit. A level variable control unit for varying the output level of the downlink band signal generation unit is adopted.

作用 本発明は上述のように構成したので、CATV用レベル監
視装置では、制御信号受信部がポーリングセレクティン
グによって自己のアドレスと測定周波数に関する制御信
号を受信すると、この制御信号をレベル測定部へ送出す
る。レベル測定部はその測定周波数のレベルを測定して
データ送出部へ送り、データ送出部では自己のアドレス
を付加して上り信号として送出する。センタにおいて
は、この測定データに上り信号をデータ信号受信部が受
けてレベル可変制御部へ制御信号を送り、レベル可変制
御部は下り帯域信号発生器のレベルを適宜のレベルに調
整する。
Effect Since the present invention is configured as described above, in the CATV level monitoring device, when the control signal receiving unit receives the control signal related to its own address and the measurement frequency by polling selecting, the control signal is sent to the level measuring unit. To do. The level measuring unit measures the level of the measured frequency and sends it to the data sending unit. The data sending unit adds its own address and sends it as an upstream signal. In the center, the data signal receiving section receives an upstream signal in the measurement data and sends a control signal to the level variable control section, and the level variable control section adjusts the level of the downstream band signal generator to an appropriate level.

実施例 次に本発明の実施例について図面を参照して説明す
る。
Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

本発明の一実施例をブロック図で示す第1図を参照す
ると、本発明のCATVレベル自動可変方式のシステムは、
センタ30と、幹線20と、CATV用レベル監視装置10とから
なり、CATV用レベル監視装置10は、入出力端子1と、方
向性波器2と、制御信号受信部3と、レベル測定部4
と、データ送出部5とを有し、またセンタには、下り帯
域信号発生器8と、方向性波器9と、データ信号受信
部6と、レベル可変制御部7とを有している。
Referring to FIG. 1 which is a block diagram showing an embodiment of the present invention, the CATV level automatic variable system of the present invention is
It comprises a center 30, a trunk line 20, and a CATV level monitoring device 10. The CATV level monitoring device 10 includes an input / output terminal 1, a directional wave device 2, a control signal receiving section 3, and a level measuring section 4.
And a data sending unit 5, and the center has a downlink band signal generator 8, a directional wave device 9, a data signal receiving unit 6, and a level variable control unit 7.

次に本実施例の動作について第1図を用いて説明す
る。
Next, the operation of this embodiment will be described with reference to FIG.

CATV用レベル監視装置10において、入出力端子1から
の入力信号は下り信号と上り信号を分離結合するための
方向性波器2を通り、下り信号は制御信号受信部3と
レベル測定部4に入力される。制御信号受信部3はポー
リングセレクティングによって、自己のアドレスと測定
周波数に関する制御信号を受信すると、レベル測定部4
に受信した測定周波数に応じた制御信号を送出する。レ
ベル測定部4は制御信号受信部3からの制御信号によっ
て測定周波数をセットし、そのレベルを測定して測定デ
ータをデータ送出部5に送出する。データ送出部5で
は、レベル測定部4から測定データを受信すると、自己
のアドレスを付加し測定データを上り帯域の信号に変換
して上り信号として送出する。この上り信号は方向性
波器2を通って入出力端子1から送出される。
In the CATV level monitoring device 10, the input signal from the input / output terminal 1 passes through the directional wave device 2 for separating and coupling the down signal and the up signal, and the down signal is sent to the control signal receiving section 3 and the level measuring section 4. Is entered. When the control signal receiving unit 3 receives a control signal regarding its own address and measurement frequency by polling selection, the level measuring unit 4
The control signal corresponding to the received measurement frequency is transmitted. The level measuring unit 4 sets the measurement frequency according to the control signal from the control signal receiving unit 3, measures the level, and sends the measurement data to the data sending unit 5. Upon receiving the measurement data from the level measurement unit 4, the data transmission unit 5 adds its own address, converts the measurement data into an upstream band signal, and transmits the upstream band signal. This upstream signal is transmitted from the input / output terminal 1 through the directional wave device 2.

上り回線を経てセンタ30に到達した測定データは、方
向性波器9を経てデータ信号受信部6へ入力される。
レベル可変制御部7はデータ信号受信部6からの制御信
号を受けて、下り帯域信号発生器8の下り送出レベルを
可変させる制御信号を送出する。下り帯域信号発生器8
は、レベル可変制御部7からの制御信号を受けて、適宜
のレベルに調整した下り信号を方向性波器9を介して
下り回線へ送出する。
The measurement data that has reached the center 30 via the uplink is input to the data signal receiving unit 6 via the directional wave device 9.
The level variable control unit 7 receives the control signal from the data signal receiving unit 6 and sends a control signal for varying the downlink transmission level of the downlink band signal generator 8. Down band signal generator 8
Receives the control signal from the level variable control unit 7 and sends the downlink signal adjusted to an appropriate level to the downlink via the directional wave device 9.

したがって、複数の測定周波数を用いてのチャンネル
間の偏差調整が自動的に可能であり、従来のように時間
と労力を費やすことがないという利点がある。
Therefore, it is possible to automatically adjust the deviation between channels using a plurality of measurement frequencies, and there is an advantage that time and labor are not required unlike the conventional case.

なお第1図においては、CATV用監視装置10は幹線20の
末端に設けられているが、適当な場所に設けても差支え
ない。
Although the CATV monitoring device 10 is provided at the end of the main line 20 in FIG. 1, it may be provided at an appropriate place.

発明の効果 以上に説明したように、本発明によれば、幹線の端末
などに、ポーリングセレクティングによって下り帯域の
測定周波数のレベルデータを折返す機能を有するCATV用
レベル監視装置と、センタにこのレベルデータを受信す
る受信部と、レベル可変制御部とを設けることにより、
監視装置で周波数を可変して測定したレベルデータをセ
ンタに折り返し、下り帯域信号発生器の出力レベルを適
宜のレベルに自動可変させる、すなわち予等化等を行う
ことができ、伝送路における基準レベルからの偏差を最
小とすることが自動的に行える効果がある。
EFFECTS OF THE INVENTION As described above, according to the present invention, the level monitoring device for CATV having the function of returning the level data of the measurement frequency of the downlink band to the terminal of the main line by polling selection is provided in the center. By providing a receiving unit for receiving level data and a level variable control unit,
The level data measured by changing the frequency with the monitoring device is returned to the center, and the output level of the downlink band signal generator can be automatically changed to an appropriate level, that is, pre-equalization etc. can be performed, and the reference level in the transmission line The effect is that the deviation from can be minimized automatically.

特に夜間等の放送サービス停止時にレベル調整を行う
場合、任意周波数を用いて詳細な周波数特性を測定でき
るという効果がある。
In particular, when the level is adjusted when the broadcasting service is stopped at night, there is an effect that detailed frequency characteristics can be measured using an arbitrary frequency.

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

第1図は本発明の一実施例のブロック図である。 1……入出力端子、2……方向性波器、3……制御信
号受信部、4……レベル測定部、5……データ送出部、
6……データ信号受信部、7……レベル可変制御部、8
……下り帯域信号発生器、9……方向性波器、10……
CATV用レベル監視装置、20……幹線、30……センタ。
FIG. 1 is a block diagram of an embodiment of the present invention. 1 ... I / O terminal, 2 ... Directional wave device, 3 ... Control signal receiving section, 4 ... Level measuring section, 5 ... Data sending section,
6 ... Data signal receiving section, 7 ... Level variable control section, 8
...... Down-band signal generator, 9 ... Directional wave generator, 10 ...
CATV level monitoring equipment, 20 …… Main line, 30 …… Center.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】各チャンネルの下り帯域信号発生器,デー
タ信号受信部,方向性波器およびポーリング・セレク
ティング制御部を有するセンタと、このセンタに直列に
中継接続する複数の幹線増幅器を有する幹線と、これら
幹線増幅器に接続する分岐増幅器および加入者端末など
からなる双方向CATV伝送システムにおいて、前記幹線の
端末などにある幹線増幅器に接続され、入出力端子と、
方向性波器と、ポーリングセレクティングによって順
次測定周波数を指定する制御信号を受信する制御信号受
信部と、この制御信号受信部に接続され指定された測定
周波数の下り帯域信号のレベルを測定するレベル測定部
と、このレベル測定部の出力レベルをデータ信号として
上り回線に送出するデータ送出部とを有するCATV用レベ
ル監視装置を設け、また前記センタの受信部に、前記監
視装置からのデータ信号を受信し、このデータ信号を用
いて前記下り帯域信号発生部の夫々の出力を可変させる
レベル可変制御部を設けたことを特徴とする CATVレベル自動可変方式。
1. A main line having a center having a downlink band signal generator of each channel, a data signal receiving unit, a directional wave unit and a polling / selecting control unit, and a plurality of main line amplifiers connected in series to the center. And a bidirectional CATV transmission system consisting of a branch amplifier connected to these main line amplifiers and subscriber terminals, etc., connected to a main line amplifier in the main line terminal, etc., and an input / output terminal,
Directional wave device, control signal receiving unit that receives control signals that sequentially specify measurement frequencies by polling selection, and level that is connected to this control signal receiving unit and that measures the level of the downlink band signal of the specified measurement frequency A CATV level monitoring device having a measuring unit and a data sending unit for sending the output level of the level measuring unit as a data signal to the uplink is provided, and the receiving unit of the center is provided with the data signal from the monitoring device. A CATV level automatic variable system characterized in that a level variable control unit is provided which receives and uses the data signal to vary each output of the downlink band signal generation unit.
JP62236928A 1987-09-21 1987-09-21 CATV level automatic variable system Expired - Lifetime JP2518307B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62236928A JP2518307B2 (en) 1987-09-21 1987-09-21 CATV level automatic variable system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62236928A JP2518307B2 (en) 1987-09-21 1987-09-21 CATV level automatic variable system

Publications (2)

Publication Number Publication Date
JPS6480188A JPS6480188A (en) 1989-03-27
JP2518307B2 true JP2518307B2 (en) 1996-07-24

Family

ID=17007829

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62236928A Expired - Lifetime JP2518307B2 (en) 1987-09-21 1987-09-21 CATV level automatic variable system

Country Status (1)

Country Link
JP (1) JP2518307B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03188784A (en) * 1989-12-19 1991-08-16 Toshiba Corp Incoming data communication signal controller for cable television system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5388514A (en) * 1977-01-14 1978-08-04 Nippon Cetu Kk System for automatically preeequalizing transmission tv signal of catv system
JPS5650680A (en) * 1979-09-29 1981-05-07 Pioneer Electronic Corp Line monitor device for two-way data communication system
JPS6053390A (en) * 1983-09-02 1985-03-27 Nec Corp Relay amplifier for catv

Also Published As

Publication number Publication date
JPS6480188A (en) 1989-03-27

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