JP2526693B2 - CATV system terminal power supply system - Google Patents

CATV system terminal power supply system

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Publication number
JP2526693B2
JP2526693B2 JP2056963A JP5696390A JP2526693B2 JP 2526693 B2 JP2526693 B2 JP 2526693B2 JP 2056963 A JP2056963 A JP 2056963A JP 5696390 A JP5696390 A JP 5696390A JP 2526693 B2 JP2526693 B2 JP 2526693B2
Authority
JP
Japan
Prior art keywords
repeater
power
terminal
control signal
transmission line
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
JP2056963A
Other languages
Japanese (ja)
Other versions
JPH03258088A (en
Inventor
光利 丸山
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
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP2056963A priority Critical patent/JP2526693B2/en
Publication of JPH03258088A publication Critical patent/JPH03258088A/en
Application granted granted Critical
Publication of JP2526693B2 publication Critical patent/JP2526693B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はCATVシステムの端末給電方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a terminal feeding system for a CATV system.

〔従来の技術〕 従来のCATVシステムの端末給電方式では、各端末が中
継器の分岐伝送路に接続され、中央局から中継器を経由
して分岐伝送路の下り方向に供給されるAC電圧を受けと
って給電する方式となっていた。
[Prior Art] In the terminal feeding system of the conventional CATV system, each terminal is connected to the branch transmission line of the repeater, and the AC voltage supplied from the central office via the repeater to the down direction of the branch transmission line is supplied. It was a method of receiving and supplying power.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

上述した従来のCATVシステムの端末給電方式では、中
央局から中継器を経由して分岐伝送路の下り方向に供給
されるAC電圧を端末が受けとって給電する方式となてい
るので、常時全ての端末が給電されるため、中央局が端
末と通信する場合以外にも、全端末に給電する必要があ
り、システムの拡大に伴ない端末がますと中央局の給電
能力を増加させなければならないという欠点がある。
In the above-mentioned conventional CATV system terminal power supply method, since the terminal receives the AC voltage supplied from the central office via the repeater in the downstream direction of the branch transmission line and supplies power, all terminals are always supplied. Since the terminals are powered, it is necessary to supply power to all terminals other than when the central office communicates with the terminals.If the terminals expand as the system expands, the power supply capacity of the central office must be increased. There are drawbacks.

〔課題を解決するための手段〕[Means for solving the problem]

本発明のCATVシステムの端末給電方式は、双方向CATV
網を構成する複数の中継器と、これら複数の中継器の分
岐伝送路を通して中央局から給電されている複数の端末
とから成るCATVシステムの端末給電方式において、前記
中継器は中央局からの中継器識別遠隔制御信号を受信し
て識別する識別手段と、自中継器に対しての中継器識別
制御信号を受信すると前記自中継器に接続する分岐伝送
路の下り方向の端末に対して前記中継器識別遠隔制御信
号によって給電を行ったり給電を停止する切替手段とを
有している。
The terminal feeding system of the CATV system of the present invention is a bidirectional CATV.
In a terminal feeding system of a CATV system consisting of a plurality of repeaters forming a network and a plurality of terminals fed from a central office through branch transmission lines of the plurality of repeaters, the repeater is a relay from the central office. Identification means for receiving and identifying a device control remote control signal, and the relay for the downstream terminal of the branch transmission line connected to the own relay device when the repeater identification control signal for the own relay device is received. And a switching means for supplying or stopping the power supply according to the device identification remote control signal.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.

第1図は本発明の一実施例を適用するCATVシステムの
一例を示すブロック図である。
FIG. 1 is a block diagram showing an example of a CATV system to which an embodiment of the present invention is applied.

第1図において本適用例は中央局11が伝送路12を経て
中継器15と接続し更に中継器16と中継器17と経て分岐伝
送路13を介して端末18に接続し、また、中継器17は別の
分岐伝送路14を持ち、端末19と端末20とに接続する構成
となっている。
In FIG. 1, the present application example is such that the central station 11 is connected to the repeater 15 via the transmission path 12, further connected to the terminal 18 via the branch transmission path 13 via the repeaters 16 and 17, and the repeater. 17 has another branch transmission line 14 and is configured to be connected to the terminals 19 and 20.

尚、端末19と端末20とは縦続接続している。 The terminals 19 and 20 are connected in cascade.

第2図は第1図に示す一適用例のCATVシステムに使用
される中継器のブロック図である。
FIG. 2 is a block diagram of a repeater used in the CATV system of one application example shown in FIG.

第2図において、本適用例の中継器は、第1図の中の
中継器17指して本発明の端末給電方式の実現のための一
実施例の中継器を示し、伝送路30を介して中央局11から
の電力とTV信号とを分離する電力分離ろ波器31と、TV信
号を上り方向と下り方向とに分離する方向性結合器32
と、下り方向へのTV信号を増幅する下り方向増幅器34
と、上り方向へのTV信号を増幅する上り方向増幅器35
と、伝送路38を介して中継器21へTV信号と電力との結合
して送出する電力分離ろ波器37と、伝送路38を経て伝送
された上り方向TV信号と増幅された下り方向TV信号とを
結合する方向性結合器36と、増幅された下り方向TV信号
と端末からの上り方向信号とを結合する方向結合器39
と、方向性結合器36をを経た上り方向TV信号と端末から
の上り方向信号とを結合する方向性結合器40と、上り方
向TV信号の中の中央局11からの中継器識別遠隔制御信号
を受信して自中継器への遠隔制御信号を識別する通信モ
ジュール33と、中央局11から送電されたAC電圧をDC電圧
に変換して自中継器へ分配するAC/DCコンバータ50と、
通信モジュール33からの電力切替制御信号によって端末
18,19への電力の切替を行う電源スイッチ42と、増幅さ
れた下り方向へのTV信号と端末18,19からの上り方向へ
の信号を結合する方向性結合器47と、増幅されたTV信号
および端末18の上り方向信号と電力とを分離して端末18
へ分岐電送路48を介して電力を供給する電力ろ波器45
と、増幅されたTV信号および端末19の上り方向信号と電
力とを分離して分岐伝送路49を介して端末19へ電力を給
電する電力分離ろ波器46とを有して構成している。
In FIG. 2, the repeater of this application example is a repeater of one embodiment for realizing the terminal power feeding system of the present invention, which is indicated by the repeater 17 in FIG. A power separation filter 31 that separates the power from the central office 11 and the TV signal, and a directional coupler 32 that separates the TV signal into an up direction and a down direction.
And a downstream amplifier 34 for amplifying the TV signal in the downstream direction.
And an upstream amplifier 35 for amplifying the upstream TV signal.
And a power separation filter 37 for combining and transmitting the TV signal and power to the repeater 21 via the transmission line 38, and the upstream TV signal transmitted via the transmission line 38 and the amplified downstream TV. Directional coupler 36 for coupling the signal, and directional coupler 39 for coupling the amplified downstream TV signal and the upstream signal from the terminal.
And a directional coupler 40 for coupling the upstream TV signal passed through the directional coupler 36 and the upstream signal from the terminal, and a repeater identification remote control signal from the central station 11 in the upstream TV signal. And a communication module 33 for identifying a remote control signal to the own repeater, an AC / DC converter 50 for converting the AC voltage transmitted from the central station 11 into a DC voltage and distributing the DC voltage to the own repeater,
Terminal by power switching control signal from the communication module 33
A power switch 42 for switching electric power to 18, 19, a directional coupler 47 for coupling the amplified downstream TV signal and an upstream signal from the terminals 18, 19 and an amplified TV The signal and the uplink signal of the terminal 18 are separated from the power to separate the signal from the terminal 18.
A power filter 45 that supplies power via a branch transmission line 48 to
And a power separation filter 46 that separates the amplified TV signal and the upstream signal of the terminal 19 from the power and supplies the power to the terminal 19 via the branch transmission path 49. .

次に、本適用例の動作について第1図,第2図を併用
して説明する。
Next, the operation of this application example will be described with reference to FIG. 1 and FIG.

中継器17は中央局11から下り方向に送出された給電を
受けると電力分離ろ波器31でAC電圧成分を取り出し、AC
/DCコンバータ50にて直流電圧に変換して、中継器17の
動作に必要な電力を得る。一方、AC電圧成分は給電ライ
ン44を経て、電力分離ろ波器37に入力される。電力分離
ろ波器37では方向性結合器32と下り方向増幅器34と方向
性結合器36を経て、送られてきたRF帯の下り方向信号と
AC電圧とを混合されて、次段中継器21に対して、伝送路
38を経て下り方向に送出される。
When the repeater 17 receives the power supplied from the central office 11 in the downward direction, the power separation filter 31 extracts the AC voltage component, and the AC
/ DC converter 50 converts the voltage into a DC voltage and obtains the electric power required for the operation of repeater 17. On the other hand, the AC voltage component is input to the power separation filter 37 via the power supply line 44. The power separation filter 37 passes through the directional coupler 32, the downstream amplifier 34, and the directional coupler 36, and the received downstream signal in the RF band.
The AC voltage is mixed with the transmission line to the next stage repeater 21.
It is transmitted in the downstream direction via 38.

中央局11が分岐伝送路48と分岐伝送路49とに給電を行
う場合、該当中継器17に中継器識別遠隔制御信号を送出
する。この中継器識別遠隔制御信号は電力分離ろ波器31
と方向性結合器32を経て、通信モジュール33に入力され
る。自己の中継器に対する制御信号であることを識別す
ると通信モジュール33はスイッチ制御信号41を出力す
る。電源スイッチ42はスイッチ制御信号41を受けると、
幹線給電ライン11と分岐給電ライン43を接続する。分岐
給電ライン43に加えられたAC電圧は電力分離ろ波器45を
経て、分岐伝送路48に出力される一方、電力ろ波器46を
経て、分岐伝送路49に出力される。
When the central office 11 supplies power to the branch transmission line 48 and the branch transmission line 49, it sends a repeater identification remote control signal to the corresponding repeater 17. This repeater identification remote control signal is a power separation filter 31
Via the directional coupler 32, and is input to the communication module 33. When the communication module 33 identifies the control signal for its own repeater, the communication module 33 outputs the switch control signal 41. When the power switch 42 receives the switch control signal 41,
The trunk power supply line 11 and the branch power supply line 43 are connected. The AC voltage applied to the branch feed line 43 is output to the branch transmission line 48 via the power separation filter 45, and is output to the branch transmission line 49 via the power filter 46.

また、中央局11か下り方向に送出したTV信号は下り方
向増幅器34と方向性結合器39と方向性結合器47を経て、
分岐伝送路48と分岐伝送路49に送出される。
Further, the TV signal transmitted from the central station 11 to the downstream direction passes through the downstream amplifier 34, the directional coupler 39 and the directional coupler 47,
It is sent to the branch transmission line 48 and the branch transmission line 49.

〔発明の効果〕〔The invention's effect〕

以上説明したように本発明は、中継器に中央局からの
中継器識別遠隔制御信号を受信して識別する識別手段
と、中継器識別遠隔制御信号によって端末への給電/給
電停止を行う切替手段とを有して中央局が送信する中継
器識別遠隔制御信号によって指定する端末と通信する場
合に限り、分岐伝送路を通して指定された端末に給電を
行う構成にすることにより指定された端末へ給電してい
る間、通信をする必要のない端末に対しては給電を停止
できるので、CATVシステムの拡張に伴ない端末数が増加
しても、常に全ての端末に給電を行なうことは不要とな
り、中央局が下り方向伝送路に供給する電源容量を少な
くすることができ、システムの拡張に伴ない中央局ので
電源容量を増やす必要がないという効果がある。
INDUSTRIAL APPLICABILITY As described above, according to the present invention, the repeater receives the repeater identification remote control signal from the central office and identifies it, and the switching means for supplying / stopping power supply to the terminal by the repeater identification remote control signal. Power is supplied to the designated terminal through the branch transmission line only when communicating with the designated terminal by the repeater identification remote control signal transmitted by the central office. During this period, it is possible to stop power supply to terminals that do not need to communicate, so even if the number of terminals increases with the expansion of the CATV system, it is not necessary to always supply power to all terminals. It is possible to reduce the power supply capacity supplied to the downlink transmission path by the central office, and it is not necessary to increase the power supply capacity of the central office as the system expands.

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

第1図は本発明の一実施例を適用するCATVシステムの一
例を示すブロック図である。 11……中央局、12……伝送路、13,14……分岐伝送路、1
5,16,17……中継器、18,19……端末。 第2図は第1図に示す一適用例のCATVシステムに使用さ
れる中継器のブロック図である。 30……伝送路、31……電力分離ろ波器、32……方向性結
合器、33……通信モジュール、34……下り方向増幅器、
35……上り方向増幅器、36……方向性結合器、37……電
力分離ろ波器、38……伝送路、39,40……方向性結合
器、41……スイッチ制御信号、42……電源スイッチ、43
……分岐給電スイッチ、44……幹線給電ライン、45,46
……電力分離ろ波器、47……方向性結合器、48,49……
分岐伝送路、50……AC/ACコンバータ。
FIG. 1 is a block diagram showing an example of a CATV system to which an embodiment of the present invention is applied. 11 …… Central station, 12 …… Transmission line, 13,14 …… Branch transmission line, 1
5,16,17 …… Repeater, 18,19 …… Terminal. FIG. 2 is a block diagram of a repeater used in the CATV system of one application example shown in FIG. 30 ... Transmission line, 31 ... Power separation filter, 32 ... Directional coupler, 33 ... Communication module, 34 ... Downward amplifier,
35 …… Upward amplifier, 36 …… Directional coupler, 37 …… Power separation filter, 38 …… Transmission line, 39,40 …… Directional coupler, 41 …… Switch control signal, 42 …… Power switch, 43
...... Branch power supply switch, 44 …… Main power supply line, 45,46
...... Power separation filter, 47 …… Directional coupler, 48,49 ……
Branch transmission line, 50 ...... AC / AC converter.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】双方向CATV網を構成する複数の中継器と、
これら複数の中継器の分岐伝送路を通して中央局から給
電されている複数の端末とから成るCATVシステムの端末
給電方式において、前記中継器は中央局からの中継器識
別遠隔制御信号を受信して識別する識別手段と、自中継
器に対しての中継器識別制御信号を受信すると前記自中
継器に接続する分岐伝送路の下り方向の端末に対して前
記中継器識別遠隔制御信号によって給電を行ったり給電
を停止する切替手段とを有することを特徴とするCATVシ
ステムの端末給電方式。
1. A plurality of repeaters constituting a bidirectional CATV network,
In a terminal feeding system of a CATV system consisting of a plurality of terminals fed from a central office through branch transmission lines of these plural repeaters, the repeater receives and identifies a repeater identification remote control signal from the central office. When the identification means and the repeater identification control signal for the own repeater are received, power is supplied to the terminal in the downward direction of the branch transmission line connected to the own repeater by the repeater identification remote control signal. A terminal power feeding method for a CATV system, comprising a switching means for stopping power feeding.
JP2056963A 1990-03-07 1990-03-07 CATV system terminal power supply system Expired - Lifetime JP2526693B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2056963A JP2526693B2 (en) 1990-03-07 1990-03-07 CATV system terminal power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2056963A JP2526693B2 (en) 1990-03-07 1990-03-07 CATV system terminal power supply system

Publications (2)

Publication Number Publication Date
JPH03258088A JPH03258088A (en) 1991-11-18
JP2526693B2 true JP2526693B2 (en) 1996-08-21

Family

ID=13042190

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2056963A Expired - Lifetime JP2526693B2 (en) 1990-03-07 1990-03-07 CATV system terminal power supply system

Country Status (1)

Country Link
JP (1) JP2526693B2 (en)

Also Published As

Publication number Publication date
JPH03258088A (en) 1991-11-18

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