JPH054862B2 - - Google Patents
Info
- Publication number
- JPH054862B2 JPH054862B2 JP19895686A JP19895686A JPH054862B2 JP H054862 B2 JPH054862 B2 JP H054862B2 JP 19895686 A JP19895686 A JP 19895686A JP 19895686 A JP19895686 A JP 19895686A JP H054862 B2 JPH054862 B2 JP H054862B2
- Authority
- JP
- Japan
- Prior art keywords
- repeater
- modulated wave
- catv
- wave
- amplitude modulated
- 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 28
- 238000012544 monitoring process Methods 0.000 claims description 27
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (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〕
本発明はCATV網の中継伝送路を構成する中
継器を監視する監視システムに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring system for monitoring repeaters forming a relay transmission path of a CATV network.
従来の中継器監視システムにおいては、中枢監
視局はポーリングにより順次各中継器を指定し、
データ伝送により該当の中継器から中継器の動作
情報を収集して中継器を監視していた。
In the conventional repeater monitoring system, the central monitoring station sequentially designates each repeater by polling,
The repeater was monitored by collecting operational information from the corresponding repeater through data transmission.
〔発明が解決しようとする問題点〕
従来の中継器監視システムでは、中継器間を接
続する伝送路が事故等により切断された場合、中
枢監視局は切断された伝送路の下位に接続された
全ての中継器との間でデータ伝送が不可能となつ
たことを認識するものの、伝送路が切断されたこ
とを特定することができないという欠点がある。[Problems to be solved by the invention] In conventional repeater monitoring systems, when the transmission line connecting repeaters is cut off due to an accident, the central monitoring station is connected to the lower level of the cut transmission line. Although it is recognized that data transmission is no longer possible with all repeaters, it has the disadvantage that it is not possible to specify that the transmission line has been disconnected.
本発明の目的は、このような欠点を除去した
CATV中継器監視システムを提供することにあ
る。 The object of the present invention is to eliminate such drawbacks.
Our objective is to provide a CATV repeater monitoring system.
本発明は、CATV網の中継伝送路を構成する
縦続接続された中継器の動作状況を１箇所の中枢
監視局で監視するCATV中継器監視システムに
おいて、
前記中継器の各々が、
自中継器の直下位に位置する中継器に対し、下
り方向にパイロツト信号として常時一定周波数の
振幅変調波を送出する手段と、直上位の中継器か
ら受信した振幅変調波の搬送波を整流し、変調波
成分を取り出し、これを上り方向に折り返し送出
する手段と、
下り方向に送出した振幅変調波に対して直下位
の中継器から送出された変調波を受信し、変調波
の有無を検出する手段と、
この変調波の有無の判定結果を電文化して中枢
監視局にデータ伝送するデータ処理部とを有し、
中継伝送部の切断箇所を検出することを特徴と
している。
The present invention provides a CATV repeater monitoring system in which the operational status of cascaded repeaters constituting a relay transmission path of a CATV network is monitored by a central monitoring station, in which each of the repeaters has the following features of its own repeater: A means for constantly transmitting an amplitude modulated wave of a constant frequency as a pilot signal in the downstream direction to the repeater located immediately below, and a means for rectifying the carrier wave of the amplitude modulated wave received from the repeater immediately above the repeater to remove the modulated wave component. a means for extracting the amplitude modulated wave and sending it back in the upstream direction; a means for receiving the modulated wave transmitted from the repeater immediately below the amplitude modulated wave transmitted in the downstream direction and detecting the presence or absence of the modulated wave; It has a data processing section that electronically converts the determination result of the presence or absence of modulated waves and transmits the data to the central monitoring station, and is characterized by detecting disconnections in the relay transmission section.
第１図は本発明によるCATV中継器監視シス
テムを示すブロツク図である。第１図において、
１は中枢監視局であり、中継器１９と３は伝送路
２により接続され、中継器３と４は伝送路５によ
り接続されている。
FIG. 1 is a block diagram showing a CATV repeater monitoring system according to the present invention. In Figure 1,
1 is a central monitoring station, repeaters 19 and 3 are connected by a transmission line 2, and repeaters 3 and 4 are connected by a transmission line 5.
各中継器は、方向性ろ波器６、帯域通過ろ波器
７、整流器８、結合器９、除波器１０，１７、下
り方向増幅器１１、上り方向増幅器１５、結合器
１２、パイロツト信号発生器１３、方向性ろ波器
１４、帯域通過ろ波器１６、データ処理部１８を
有している。 Each repeater includes a directional filter 6, a bandpass filter 7, a rectifier 8, a coupler 9, a wave remover 10, 17, a downstream amplifier 11, an upstream amplifier 15, a coupler 12, and a pilot signal generator. 13, a directional filter 14, a bandpass filter 16, and a data processing section 18.
このような構成のCATV中継器監視システム
では、中枢監視局１はCATV中継伝送路に縦続
接続される中継器１９と中継器３と中継器４を監
視している。中継器３はパイロツト信号発生器１
３で生成したパイロツト信号としての振幅変調波
を結合器１２と方向性ろ波器１４を通して下り方
向の伝送路５に常時送出している。また中継器３
は直上位の中継器１９から同様にして伝送路２に
送出されたパイロツト信号としての振幅変調波を
方向性ろ波器６を通して取り込み、このパイロツ
ト信号を選択するための帯域通過ろ波器７を経て
整流器８で振幅変調波の搬送波を整流し、変調波
成分を取り出す。整流器８の出力である変調波は
結合器９と方向性ろ波器６を経て、常時、伝送路
２の上り方向に送出される。なお、方向性ろ波器
６を通して取り込まれた振幅変調波は、除波器１
０により削除されるので、この振幅変調波が結合
器１２と方向性ろ波器１４を通り、伝送路５に出
力されることはない。 In the CATV repeater monitoring system having such a configuration, the central monitoring station 1 monitors the repeaters 19, 3, and 4 that are cascade-connected to the CATV relay transmission line. Repeater 3 is pilot signal generator 1
The amplitude modulated wave as a pilot signal generated in step 3 is constantly sent out to the downstream transmission line 5 through the coupler 12 and the directional filter 14. Also repeater 3
Similarly, the amplitude modulated wave as a pilot signal sent to the transmission line 2 from the repeater 19 immediately above is taken in through the directional filter 6, and the band pass filter 7 is used to select this pilot signal. Thereafter, the carrier wave of the amplitude modulated wave is rectified by a rectifier 8, and the modulated wave component is extracted. The modulated wave that is the output of the rectifier 8 passes through the coupler 9 and the directional filter 6, and is always sent out in the upward direction of the transmission line 2. Note that the amplitude modulated wave taken in through the directional filter 6 is passed through the wave remover 1.
0, this amplitude modulated wave will not pass through the coupler 12 and the directional filter 14 and be output to the transmission line 5.
中継器４も同様にして中継器３が下り方向伝送
路５に送出した振幅変調波を整流し、これにより
得られた変調波を中継器３に対して送出している
が、中継器３はこの変調波を取り込み、方向性ろ
波器１４と上り方向増幅器１５とこの変調波を選
択するための帯域通過ろ波器１６を経て、データ
処理部１８に送られる。データ処理部１８は、変
調波のレベルを測定することで変調波の有無を検
出する。 Similarly, the repeater 4 rectifies the amplitude modulated wave that the repeater 3 sends out to the downlink transmission line 5, and sends the modulated wave obtained thereby to the repeater 3. This modulated wave is taken in and sent to the data processing section 18 through a directional filter 14, an upstream amplifier 15, and a bandpass filter 16 for selecting this modulated wave. The data processing unit 18 detects the presence or absence of a modulated wave by measuring the level of the modulated wave.
上り方向増幅器１５を通して得た変調波は除波
器１７により削除されるので、この変調波が結合
器９と方向性ろ波器６を通り、伝送路２に出力さ
れることはない。 Since the modulated wave obtained through the upstream amplifier 15 is removed by the wave remover 17, this modulated wave will not pass through the coupler 9 and the directional filter 6 and be output to the transmission line 2.
さて、以上のような構成の監視システムにおい
て、中継器３と中継器４との間のCATV伝送路
５が断となつた場合は、中継器３は伝送路５の上
り方向に出力されている変調波を検出しなくなる
ので、この判定結果をもとにデータ処理部１８は
伝送路５が切断されたことを特定できる。 Now, in the monitoring system configured as above, if the CATV transmission line 5 between the repeater 3 and the repeater 4 is disconnected, the repeater 3 outputs the signal in the upstream direction of the transmission line 5. Since the modulated wave is no longer detected, the data processing unit 18 can specify that the transmission line 5 is disconnected based on this determination result.
この情報はデータ伝送により中継器３から中枢
監視局１に転送され、中枢監視局１は伝送路５が
切断されたことを検出可能となる。 This information is transferred from the repeater 3 to the central monitoring station 1 by data transmission, and the central monitoring station 1 is able to detect that the transmission line 5 is disconnected.
以上説明したように本発明によるCATV中継
器監視システムは、各中継器が直下位に位置する
中継器との間のCATV伝送路の切断の有無を独
自に監視する機能、及びその監視結果をデータ伝
送により中枢監視局に送信する機能を有すること
により、中枢監視局がCATV伝送路の任意の切
断箇所を特定することが可能となり、CATV伝
送網の保守、管理が容易になるという効果があ
る。
As explained above, the CATV repeater monitoring system according to the present invention has a function in which each repeater independently monitors the presence or absence of disconnection of the CATV transmission line between it and the repeater located directly below it, and the monitoring results are stored as data. By having the function of transmitting data to the central monitoring station, the central monitoring station can specify any cut point in the CATV transmission path, which has the effect of facilitating maintenance and management of the CATV transmission network.
第１図は本発明によるCATV中継器監視シス
テムの一実施例を示すブロツク図である。
１……中枢監視局、２，５……伝送路、３，
４，１９……中継器、６，１４……方向性ろ波
器、７，１６……帯域通過ろ波器、８……整流
器、９，１２……結合器、１０，１７……除波
器、１１……下り方向増幅器、１３……パイロツ
ト信号発生器、１５……上り方向増幅器、１８…
…データ処理部。
FIG. 1 is a block diagram showing an embodiment of a CATV repeater monitoring system according to the present invention. 1... Central monitoring station, 2, 5... Transmission line, 3,
4, 19... Repeater, 6, 14... Directional filter, 7, 16... Band pass filter, 8... Rectifier, 9, 12... Coupler, 10, 17... Wave rejecter. 11...downstream amplifier, 13...pilot signal generator, 15...upstream amplifier, 18...
...Data processing section.
Claims (1)
された中継器の動作状況を１箇所の中枢監視局で
監視するCATV中継器監視システムにおいて、 前記中継器の各々が、 自中継器の直下位に位置する中継器に対し、下
り方向にパイロツト信号として常時一定周波数の
振幅変調波を送出する手段と、直上位の中継器か
ら受信した振幅変調波の搬送波を整流し、変調波
成分を取り出し、これを上り方向に折り返し送出
する手段と、 下り方向に送出した振幅変調波に対して直下位
の中継器から送出された変調波を受信し、変調波
の有無を検出する手段と、 この変調波の有無の判定結果を電文化して中枢
監視局にデータ伝送するデータ処理部とを有し、 中継伝送路の切断箇所を検出することを特徴と
するCATV中継器監視システム。[Claims] 1. In a CATV repeater monitoring system in which the operational status of cascaded repeaters constituting a relay transmission path of a CATV network is monitored by one central monitoring station, each of the repeaters has its own A means for constantly transmitting an amplitude modulated wave of a constant frequency as a pilot signal in the downward direction to a repeater located immediately below the repeater, and a means for rectifying and modulating the carrier wave of the amplitude modulated wave received from the repeater immediately above the repeater. A means for extracting a wave component and sending it back in the upstream direction, and a means for receiving a modulated wave transmitted from a repeater immediately below the amplitude modulated wave transmitted in the downstream direction, and detecting the presence or absence of a modulated wave. 1. A CATV repeater monitoring system comprising: a data processing unit that electronically converts the determination result of the presence or absence of a modulated wave and transmits the data to a central monitoring station, and detects a cut point in a relay transmission path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198956A JPS6356031A (en) | 1986-08-27 | 1986-08-27 | Supervisory system for catv repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61198956A JPS6356031A (en) | 1986-08-27 | 1986-08-27 | Supervisory system for catv repeater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6356031A JPS6356031A (en) | 1988-03-10 |
| JPH054862B2 true JPH054862B2 (en) | 1993-01-21 |
Family
ID=16399734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61198956A Granted JPS6356031A (en) | 1986-08-27 | 1986-08-27 | Supervisory system for catv repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6356031A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0470221A (en) * | 1990-07-11 | 1992-03-05 | Nec Corp | Amplifying/repeating system for line signal |
-
1986
- 1986-08-27 JP JP61198956A patent/JPS6356031A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6356031A (en) | 1988-03-10 |
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