JPH01140825A - Catv repeater - Google Patents
Catv repeaterInfo
- Publication number
- JPH01140825A JPH01140825A JP62297439A JP29743987A JPH01140825A JP H01140825 A JPH01140825 A JP H01140825A JP 62297439 A JP62297439 A JP 62297439A JP 29743987 A JP29743987 A JP 29743987A JP H01140825 A JPH01140825 A JP H01140825A
- Authority
- JP
- Japan
- Prior art keywords
- repeater
- transmission line
- signals
- branch transmission
- inputted
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
Landscapes
- 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〕
との発明はＣＡＴＶ網を構成するＣＡＴＶ中継器に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The invention relates to a CATV repeater constituting a CATV network.
従来、この種のＣＡＴＶＩ’ｔ’ａ’器は幹線伝送路に
よる中継器の縦続接続および分岐接続により構成された
伝送路において、自中継器の直下位に位置する中継器と
の間の伝送路の切断を検出し、この判定結果を中継器内
に組込まれたデータ処理部の働きにより上り方向の伝送
路を介して中枢監視局にデータ伝送する機能を有してお
り、中枢監視局は幹線伝送路および１つの分岐伝送路の
切断箇所を知ることが可能となっていた。Conventionally, this type of CATVI 't'a' equipment connects its own repeater to a repeater located directly below it in a transmission line configured by cascading and branching repeaters on a main transmission line. It has the function of detecting disconnection of the main line and transmitting this judgment result to the central monitoring station via the upstream transmission path by the function of the data processing unit built into the repeater. It was possible to know where the transmission line and one branch transmission line were cut.
上述し九従来のＣＡＴＶ中継器は、各中継器が縦続接続
および分岐接続されている場合には直下位の中継器との
間の幹線伝送路の切断と１ケ所の分岐伝送路の切断しか
検出することができないので、複数分岐伝送路の切断を
検出することができないという欠点がおる。The above-mentioned nine conventional CATV repeaters detect only a disconnection of the main transmission line between the repeaters immediately below it and a disconnection of one branch transmission line when each repeater is connected in cascade or branch connection. Therefore, there is a drawback that disconnection of multiple branch transmission lines cannot be detected.
この発明に係るＣＡＴＶ中継器は、中枢監視局が下り方
向に常時送出している振幅変調されたパイロット信号を
取り込み中継器内で検波して変調信号を検出しこれを折
シ返し上り方向に送出する手段と、幹線伝送路上で直下
位に位置する中継器から上り方向に送出された変調信号
を受信する手段と、自中継器から分岐した複数の分岐線
上で直下位に位置する中継器から上り方向に送出された
変調信号を受信する手段と、これら信号の有無を中継器
内で常時自動的に判定する手段と、この判定結果を電文
化して中枢監視局に送出するデータ通信機能を有するデ
ータ処理手段とを有している。The CATV repeater according to the present invention takes in an amplitude-modulated pilot signal that is constantly sent out in the downstream direction by a central monitoring station, detects it within the repeater, detects a modulated signal, and sends it back in the upstream direction. a means for receiving a modulated signal transmitted in the upstream direction from a repeater located directly below the main transmission line; It has a means for receiving modulated signals sent in the direction, a means for constantly automatically determining the presence or absence of these signals within the repeater, and a data communication function for transmitting the result of this determination electronically to the central monitoring station. and data processing means.
この発明は自中継器から分岐する複数の分岐伝送路の切
断を中継器が独自に識別し検出することができる。According to the present invention, a repeater can independently identify and detect disconnection of a plurality of branch transmission lines branching from its own repeater.
図はこの発明に係るＣ人ＴＶ中継器の一実施例を示すブ
ロック図である。同図において、１は中枢監視局、２お
よび３は中枢監視局１に対して幹線伝送路４を介して縦
続接続された中継器、５および６は中継器２に分岐伝送
路７を介して接続された中継器、８＆〜８ｆは結合器、
９ａおよび９ｂは方向性結合器、１０ａ′および１０ｂ
′は帯域通過フィルタ、１１は検波器、１２ａおよび１
２ｂは除波部、１３は切替部、１４は変調信号検出部、
１５は切替制御信号１５＆を出力するデータ処理部、１
６は分配器である。The figure is a block diagram showing an embodiment of the C-person TV repeater according to the present invention. In the figure, 1 is a central monitoring station, 2 and 3 are repeaters connected to the central monitoring station 1 via a main transmission line 4, and 5 and 6 are connected to the repeater 2 via a branch transmission line 7. Connected repeater, 8&~8f is combiner,
9a and 9b are directional couplers, 10a' and 10b
' is a bandpass filter, 11 is a detector, 12a and 1
2b is a wave removal section, 13 is a switching section, 14 is a modulation signal detection section,
15 is a data processing unit that outputs a switching control signal 15&;
6 is a distributor.
なお、前記除波部１２ｍは中継器３全通して上り方向に
送出された変調信号を取除くものである。Note that the wave removal section 12m is for removing the modulated signal transmitted in the up direction through the entire repeater 3.
次に、上記構成によるＣＡＴＶ中継器の動作について説
明する。Ｌ＆ず、中枢監視局１は幹線伝送路４を介して
縦続接続された中継器２および３と分岐伝送路Ｔを介し
て中継器５および６を監視している。そして、この中枢
監視局１から下り方向に送出されている振幅変調された
パイロット信号は増幅器ＩＱａ−結合器８ｆ−幹線伝送
路４を弁して直下位の中継器３に送出され、分配器１６
一方向性結合器９−分岐伝送路７を介して中継器６に送
出され、および結合器８ａ−帯域通過フィルタ１０ａ°
−検波器１１に送出される。したがって、この検波器１
１は入力するパイロット信号から変調信号を検出して出
力する。この変調信号は結合器８ｃ−結合器８ｂを通し
て常時上９方向に送出されている。そして、中継器３か
ら折り返し上り方向に送出されたに調信号は結合器８ｆ
−増幅器１０ｂを介して切替部１３に入力する。一方、
中継器５および中継器６から上り方向に送出された変調
信号はそれぞれ方向性結合器９ａおよび９ｂを介して切
替部１３に入力する。したがって、切替部１３はデータ
処理部１５から出力された切替制御信号１５ａの入力に
よシ常に順番に１つの入力を選択して、変調信号を選び
だすための帯域通過フィルタ１０ｂ′を介して変調信号
検出部１４に出力する。したがって、変調イδ号検出部
１４は変調信号を検出し、その判定結果はデータ処理部
１５で電文化されたのち、結合器８ｂ−結合器ａ＆−幹
線伝送路１介して中枢監視局１に送信される。Next, the operation of the CATV repeater with the above configuration will be explained. A central monitoring station 1 monitors repeaters 2 and 3 cascaded via a main transmission line 4 and repeaters 5 and 6 via a branch transmission line T. Then, the amplitude-modulated pilot signal sent in the downstream direction from the central monitoring station 1 is sent to the downstream repeater 3 through the amplifier IQa, coupler 8f, and main transmission line 4, and then sent to the distributor 16.
One-way coupler 9 - sent to repeater 6 via branch transmission line 7, and coupler 8a - bandpass filter 10a°
- sent to the detector 11; Therefore, this detector 1
1 detects a modulated signal from an input pilot signal and outputs it. This modulated signal is always sent out in the upper nine directions through the coupler 8c and the coupler 8b. Then, the modulation signal sent back from the repeater 3 in the upward direction is sent to the coupler 8f.
- Input to the switching section 13 via the amplifier 10b. on the other hand,
Modulated signals sent in the upstream direction from repeaters 5 and 6 are input to switching unit 13 via directional couplers 9a and 9b, respectively. Therefore, the switching section 13 always selects one input in sequence according to the input of the switching control signal 15a outputted from the data processing section 15, and modulates the signal via the bandpass filter 10b' for selecting the modulation signal. The signal is output to the signal detection section 14. Therefore, the modulation signal δ detection unit 14 detects the modulation signal, and the determination result is electronically encoded in the data processing unit 15 and sent to the central monitoring station 1 via the coupler 8b, coupler a, and trunk transmission line 1. Sent.
このような伝送状態において、分岐伝送路７が切断され
た場合、この分岐伝送路Ｔを介して中継器２には変調信
号が入力しない。このため、データ処理部１５はこの変
調信号が入力しないことを検出して、分岐伝送路Ｔが切
断されているという内容の電文を作成して上り方向に送
出する。したがって、中枢監視局１はこの電文を受信し
て内容を解析することによシ障害状況を知ることができ
る。In such a transmission state, if the branch transmission line 7 is disconnected, no modulated signal is input to the repeater 2 via this branch transmission line T. Therefore, the data processing unit 15 detects that this modulated signal is not input, creates a message indicating that the branch transmission line T is disconnected, and sends it in the upstream direction. Therefore, the central monitoring station 1 can know the failure status by receiving this message and analyzing the contents.
また、分岐先の中継器５および中継器６全通して上り方
向に送られたＣＡＴＶサービス信号は、結合器８ｅ−増
幅器１０ｃを介して除波器ｊ２ｂで変調成分が取除かれ
たのち結合器８ｄＫ入力する。また、分岐伝送路Ｔおよ
び幹線伝送路４を介して上り方向に送られる信号は結合
器８ｄ−結合器８０ａ結合器８ｂを介して上位に送られ
る。Further, the CATV service signal sent in the upstream direction through all of the branch destination repeaters 5 and 6 passes through the coupler 8e and the amplifier 10c, and the modulation component is removed by the wave remover j2b, and then the signal is sent to the coupler 8e and the repeater 6. Input 8dK. Further, signals sent in the upstream direction via the branch transmission line T and the main transmission line 4 are sent to the upper level via the coupler 8d, coupler 80a, and coupler 8b.
上述したように、中枢監視局が下り方向に送出した振幅
変調されたパイロット信号を取り込んで分岐伝送路に送
出し、分岐伝送路上の直下位の中継器がこのパイロット
信号に対応して上り方向に送出した変調信号の有無を分
岐伝送路毎に順番に検出する機能を各中継器に設けるこ
とにより、復数の分岐伝送路の切断を中枢監視局で検出
することができる。As mentioned above, the central monitoring station captures the amplitude-modulated pilot signal sent in the downstream direction and sends it to the branch transmission line, and the repeater directly below the branch transmission line transmits the amplitude-modulated pilot signal in the upstream direction in response to this pilot signal. By providing each repeater with a function of sequentially detecting the presence or absence of the transmitted modulated signal for each branch transmission line, the central monitoring station can detect the disconnection of multiple branch transmission lines.
以上詳細に説明したように、この発明に係るＣＡＴＶ中
継器によれば、中枢監視局で複数の分岐伝送路の切断を
検出することが可能になり、ＣＡＴＶ網の保守および管
理がきわめて容易になるなどの効果がある。As explained in detail above, according to the CATV repeater according to the present invention, it becomes possible to detect disconnection of multiple branch transmission lines at the central monitoring station, and maintenance and management of the CATV network becomes extremely easy. There are effects such as
図はこの発明に係るＣＡＴＶ中継器の一実施例を示すブ
ロック図である。
１・・・・中枢監視局、２および３・・・・中継器、４
・・・・幹線伝送路、５および６・・・会中継器、Ｂ＆
〜８ｆ・・・・結合器、９＆および９ｂ・・・・方向性
結合器、１０ｍおよび１０ｇ・・・・帯域通過フィルタ
、１１・・・・検波器、１２ｍおよび１２ｂ・・・・除
波部、１３・・・・切替部、１４・・・・変調信号検出
部、１５・・・・データ処理部、１６・・・・分配器。The figure is a block diagram showing an embodiment of a CATV repeater according to the present invention. 1... Central monitoring station, 2 and 3... Repeater, 4
...Main transmission line, 5 and 6...Repeater, B&
~8f...Coupler, 9& and 9b...Directional coupler, 10m and 10g...Band pass filter, 11...Detector, 12m and 12b...Wave removal section , 13...Switching section, 14...Modulation signal detection section, 15...Data processing section, 16...Distributor.
Claims (1)
するＣＡＴＶ網において、中枢監視局が下り方向に常時
送出している振幅変調されたパイロット信号を取り込み
中継器内で検波して変調信号を検出しこれを折返し上り
方向に送出する手段と、幹線伝送路上で直下位に位置す
る中継器から上り方向に送出された変調信号を受信する
手段と、自中継器から分岐した複数の分岐線上で直下位
に位置する中継器から上り方向に送出された変調信号を
受信する手段と、これら信号の有無を中継器内で常時自
動的に判定する手段と、この判定結果を電文化して中枢
監視局に送出するデータ通信機能を有するデータ処理手
段とを備えたことを特徴とするＣＡＴＶ中継器。In a CATV network where the operational status of CATV repeaters is monitored by a central monitoring station, the central monitoring station constantly sends out an amplitude-modulated pilot signal in the downstream direction, which is then detected within the repeater and converted into a modulated signal. A means for detecting and returning the signal and sending it in the upstream direction, a means for receiving the modulated signal sent in the upstream direction from a repeater located immediately below on the trunk transmission path, and a means for receiving the modulated signal sent out in the upstream direction from a repeater located directly below the main transmission line, A means for receiving modulated signals transmitted in the upstream direction from a repeater located immediately below, a means for automatically determining the presence or absence of these signals at all times within the repeater, and central monitoring by digitizing the results of this determination. A CATV repeater comprising: data processing means having a data communication function for sending data to a station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29743987A JPH0683158B2 (en) | 1987-11-27 | 1987-11-27 | CATV repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29743987A JPH0683158B2 (en) | 1987-11-27 | 1987-11-27 | CATV repeater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01140825A true JPH01140825A (en) | 1989-06-02 |
| JPH0683158B2 JPH0683158B2 (en) | 1994-10-19 |
Family
ID=17846536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29743987A Expired - Lifetime JPH0683158B2 (en) | 1987-11-27 | 1987-11-27 | CATV repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0683158B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06204201A (en) * | 1992-09-25 | 1994-07-22 | Dainippon Screen Mfg Co Ltd | Substrate processor |
-
1987
- 1987-11-27 JP JP29743987A patent/JPH0683158B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06204201A (en) * | 1992-09-25 | 1994-07-22 | Dainippon Screen Mfg Co Ltd | Substrate processor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0683158B2 (en) | 1994-10-19 |
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