JPH0683158B2 - CATV repeater - Google Patents
CATV repeaterInfo
- Publication number
- JPH0683158B2 JPH0683158B2 JP29743987A JP29743987A JPH0683158B2 JP H0683158 B2 JPH0683158 B2 JP H0683158B2 JP 29743987 A JP29743987 A JP 29743987A JP 29743987 A JP29743987 A JP 29743987A JP H0683158 B2 JPH0683158 B2 JP H0683158B2
- Authority
- JP
- Japan
- Prior art keywords
- repeater
- monitoring station
- transmission line
- catv
- central monitoring
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 30
- 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
- 238000012258 culturing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はCATV網を構成するCATV中継器に関する。[Detailed Description of the Invention] [Industrial application] The present invention relates to a CATV repeater that constitutes a CATV network.
従来、この種のCATV中継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
ることが可能となつていた。Conventionally, this type of CATV repeater detects disconnection of the transmission line between the repeater located directly below the repeater in the transmission line configured by cascade connection and branch connection of the repeater by the main line transmission line. However, the determination unit has a function of transmitting data to the central monitoring station via the upstream transmission line by the function of the data processing unit incorporated in the repeater. It was possible to know the disconnection point of the two branch transmission lines.
上述した従来の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ある。The above-mentioned conventional CATV repeater detects only the disconnection of the trunk transmission line between the relays of the immediately lower order and the disconnection of one branch transmission line when the repeaters are cascaded and branched. Since this is not possible, there is a drawback that disconnection of the multi-branch transmission line 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ツト信号を取り
込み中継器内で検波して変調信号を検出しこれを折り返
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 is a means for taking in an amplitude-modulated pilot signal which is always transmitted in the downward direction by the central monitoring station, detecting it in the repeater, detecting the modulated signal, and sending it back in the upward direction. A means for receiving a modulated signal transmitted in the upstream direction from a repeater located immediately below the trunk transmission line, and an upstream direction from a repeater located immediately below the multiple branch lines branched from the own repeater. Data processing having means for receiving the transmitted modulated signals, means for automatically determining the presence / absence of these signals in the repeater, and data communication function for electronically transmitting the determination result to the central monitoring station And 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, the repeater can uniquely identify and detect disconnection of a plurality of branch transmission lines branched from the own repeater.
図はこの発明に係るCATV中継器の一実施例を示すブロツ
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、8a〜8fは結合器、9aおよび
9bは方向性結合器、10a′および10b′は帯域通過フイル
タ、11は検波器、12aおよび12b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15aを出力する
データ処理部、16は分配器である。FIG. 1 is a block diagram showing an embodiment of a CATV repeater according to the present invention. In the figure, 1 is a central monitoring station, 2 and 3 are repeaters connected in series to the central monitoring station 1 via a main transmission line 4, and 5 and 6 are branch transmission lines 7 to a repeater 2.
Relays connected through, 8a-8f are couplers, 9a and
9b is a directional coupler, 10a 'and 10b' are band-pass filters, 11 is a detector, 12a and 12b are demultiplexing units, 13 is a switching unit,
Reference numeral 14 is a modulation signal detection unit, 15 is a data processing unit that outputs the switching control signal 15a, and 16 is a distributor.
なお、前記除波部12aは中継器３を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。The wave removing unit 12a removes the modulated signal transmitted in the upstream direction through the 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。まず、中継監視局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７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
ツト信号は増幅器10a−結合器8f−幹線伝送路４を介し
て直下位の中継器３に送出され、分配器16−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−帯域通過フイルタ10a′−検波器11に送出
される。したがつて、この検波器11は入力するパイロツ
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8e−結合器8bを通して常時上り方向に送出され
ている。そして、中継器３から折り返し上り方向に送出
された変調信号は結合器8f−増幅器10bを介して切替部1
3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。したがつて、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
の入力により常に順番に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イルタ10b′を介して変
調信号検出部14に出力する。したがつて、変調信号検出
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8a−幹線伝送
路４を介して中枢監視局１に送信される。Next, the operation of the CATV repeater having the above configuration will be described. First, the relay monitoring station 1 monitors the relays 2 and 3 cascade-connected via the trunk transmission line 4 and the relays 5 and 6 via the branch transmission line 7. Then, the amplitude-modulated pilot signal transmitted from the central monitoring station 1 in the downstream direction is transmitted to the relay device 3 located immediately below via the amplifier 10a, the coupler 8f, and the trunk transmission line 4, and the distributor 16- It is sent to the repeater 6 via the directional coupler 9-branch transmission line 7, and to the coupler 8a-bandpass filter 10a'-detector 11. Therefore, the detector 11 detects the modulation signal from the input pilot signal and outputs it. This modulated signal is always transmitted in the upstream direction through the combiner 8e-combiner 8b. Then, the modulated signal transmitted from the repeater 3 in the returning direction is transmitted through the coupler 8f-amplifier 10b to the switching unit 1
Enter in 3. On the other hand, the modulated signals transmitted from the repeaters 5 and 6 in the upstream direction are input to the switching unit 13 via the directional couplers 9a and 9b, respectively. Therefore, the switching unit 13 controls the switching control signal 15a output from the data processing unit 15.
One input is always selected in order by the input of, and is output to the modulation signal detecting unit 14 via the band pass filter 10b 'for selecting the modulation signal. Therefore, the modulation signal detection unit 14 detects the modulation signal, and the determination result is the data processing unit.
After being electro-cultivated at 15, it is transmitted to the central monitoring station 1 through the coupler 8b-combiner 8a-main line transmission line 4.
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７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７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り生涯状況を知ることができ
る。In such a transmission state, when the branch transmission line 7 is disconnected, the modulation signal is not input to the repeater 2 via this branch transmission line 7. Therefore, the data processing unit 15 detects that the modulated signal is not input, creates a message with the content that the branch transmission path 7 is disconnected, and sends it in the upstream direction. Therefore, the central monitoring station 1 can know the lifetime situation by receiving this electronic message and analyzing the content.
また、分岐先の中継器５および中継器６を通して上り方
向に送られたCATVサービス信号は、結合器8e−増幅器10
cを介して除波器12bで変調成分が取除かれたのち結合器
8dに入力する。また、分岐伝送路７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8c
−結合器8bを介して上位に送られる。Also, the CATV service signal sent in the upstream direction through the branch destination repeaters 5 and 6 is the coupler 8e-amplifier 10
After the modulation component is removed by the demultiplexer 12b via c, the combiner
Type in 8d. In addition, the branch transmission line 7 and the trunk transmission line 4
The signal sent in the upstream direction via the combiner 8d-combiner 8c
-Sent to the upper level via the combiner 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
変調されたパイロツ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ツト
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、複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 described above, the central monitoring station takes in the amplitude-modulated pilot signal sent in the downward direction and sends it to the branch transmission line, and the repeater immediately below the branch transmission line responds to the pilot signal in the upward direction. By providing each repeater with the function of sequentially detecting the presence or absence of the transmitted modulated signal for each branch transmission line, disconnection of a plurality of branch transmission lines can be detected by the central monitoring station.
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 described in detail above, according to the CATV repeater according to the present invention, it becomes possible for the central monitoring station to detect disconnection of a plurality of branch transmission lines, which makes maintenance and management of the CATV network extremely easy. And so on.
図はこの発明に係るCATV中継器の一実施例を示すブロツ
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……中継器、8a〜8f……結合器、9a
および9b……方向性結合器、10a′および10b′……帯域
通過フイルタ、11……検波器、12a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。FIG. 1 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, 8a-8f ... Coupler, 9a
And 9b ... Directional coupler, 10a 'and 10b' ... Band-pass filter, 11 ... Detector, 12a and 12b ... Separation section, 13 ... Switching section, 14 ... Modulation signal detection section, 15 …… Data processing unit, 16 …… Distributor.
Claims (1)
局で監視する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ツト信号を取り
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。1. In a CATV network in which the operation status of a CATV repeater is monitored by one central monitoring station, an amplitude-modulated pilot signal that is constantly transmitted in the downward direction by the central monitoring station is taken in and detected in the repeater. Then, it detects the modulated signal and sends it back in the upstream direction, a means for receiving the modulated signal sent in the upstream direction from a repeater located immediately below the trunk transmission line, and a branch from the own repeater. A means for receiving the modulated signals transmitted in the upstream direction from the repeaters located immediately below the plurality of branch lines, a means for automatically determining the presence / absence of these signals in the repeater, and a method for transmitting the result of this judgment. A CATV repeater comprising: a data processing means having a data communication function of culturing and transmitting to a central monitoring 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 JPH01140825A (en) | 1989-06-02 |
| JPH0683158B2 true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2739419B2 (en) * | 1992-09-25 | 1998-04-15 | 大日本スクリーン製造株式会社 | Substrate processing equipment |
-
1987
- 1987-11-27 JP JP29743987A patent/JPH0683158B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01140825A (en) | 1989-06-02 |
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