JPS6447178U - - Google Patents

Info

Publication number
JPS6447178U
JPS6447178U JP1987142253U JP14225387U JPS6447178U JP S6447178 U JPS6447178 U JP S6447178U JP 1987142253 U JP1987142253 U JP 1987142253U JP 14225387 U JP14225387 U JP 14225387U JP S6447178 U JPS6447178 U JP S6447178U
Authority
JP
Japan
Prior art keywords
oscillator
end device
frequency converter
catv system
level
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
JP1987142253U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP1987142253U priority Critical patent/JPS6447178U/ja
Publication of JPS6447178U publication Critical patent/JPS6447178U/ja
Pending legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例に係わるＣＡＴＶシ
ステム用ヘツドエンド装置における周波数変換器
の周辺構成を示すブロツク図、第２図は上記周波
数変換器に対し設けられるパイロツト発振器を示
すブロツク構成図、第３図は上記ヘツドエンド装
置を配設したＣＡＴＶ通信網を示すシステムブロ
ツク図である。 １０……周波数変換器、１３……局部発振器、
１４……分岐部、１５……パイロツト発振器、１
６……切換えスイツチ、１７……ＰＬＬ発振器、
１８……スイツチ、１９……ＡＧＣ回路、２０…
…ヘツドエンド装置、２２ａ，２２ｂ……同軸ケ
ーブル、２３ａ，２３ｂ……双方向増幅器、２５
ａ〜２５ｃ……端末機器、Ｇ．Ｃ．……ゲインコ
ントローラ。 FIG. 1 is a block diagram showing the peripheral configuration of a frequency converter in a head end device for a CATV system according to an embodiment of the present invention, FIG. 2 is a block diagram showing a pilot oscillator provided for the frequency converter, and FIG. FIG. 3 is a system block diagram showing a CATV communication network in which the above-mentioned head end equipment is installed. 10... Frequency converter, 13... Local oscillator,
14...Branch portion, 15...Pilot oscillator, 1
6...Switch switch, 17...PLL oscillator,
18...Switch, 19...AGC circuit, 20...
...Head end device, 22a, 22b...Coaxial cable, 23a, 23b...Bidirectional amplifier, 25
a to 25c...Terminal equipment, G. C. ...gain controller.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 周波数変換器を備えたＣＡＴＶシステム用ヘツ
ドエンド装置において、加入者端末に対する予め
設定された下り周波数帯域の中心周波数で発振す
る発振器と、この発振器からの発振出力レベルを
任意のレベルに調整するレベル調整手段と、上記
周波数変換器と上記発振器の動作を切換えるスイ
ツチとを具備したことを特徴とするＣＡＴＶシス
テム用ヘツドエンド装置。 A head end device for a CATV system equipped with a frequency converter includes an oscillator that oscillates at the center frequency of a preset downstream frequency band for subscriber terminals, and a level adjustment means that adjusts the oscillation output level from the oscillator to an arbitrary level. A head-end device for a CATV system, comprising: and a switch for switching operations of the frequency converter and the oscillator.
JP1987142253U 1987-09-17 1987-09-17 Pending JPS6447178U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987142253U JPS6447178U (en) 1987-09-17 1987-09-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987142253U JPS6447178U (en) 1987-09-17 1987-09-17

Publications (1)

Publication Number Publication Date
JPS6447178U true JPS6447178U (en) 1989-03-23

Family

ID=31408045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987142253U Pending JPS6447178U (en) 1987-09-17 1987-09-17

Country Status (1)

Country Link
JP (1) JPS6447178U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7379101B2 (en) 2001-11-14 2008-05-27 Casio Computer Co., Ltd. Photosensor system and drive control method for the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5714465U (en) * 1980-06-30 1982-01-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5714465U (en) * 1980-06-30 1982-01-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7379101B2 (en) 2001-11-14 2008-05-27 Casio Computer Co., Ltd. Photosensor system and drive control method for the same

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