JPH02226924A - Signal transmission system - Google Patents
Signal transmission systemInfo
- Publication number
- JPH02226924A JPH02226924A JP1048261A JP4826189A JPH02226924A JP H02226924 A JPH02226924 A JP H02226924A JP 1048261 A JP1048261 A JP 1048261A JP 4826189 A JP4826189 A JP 4826189A JP H02226924 A JPH02226924 A JP H02226924A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- repeater
- converter
- point
- signal transmission
- 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
Links
- 230000008054 signal transmission Effects 0.000 title claims description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はＣＡＴＶなどに用いると好適な信号伝送システ
ムに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal transmission system suitable for use in CATV and the like.
従来のこの種のシステムでは、信号の伝送は電気により
行われ、伝送媒体としては同軸ケーブルが主流であった
。しかしながら、同軸ケーブルでは信号の減衰が著しい
ことから、遠距離の信号伝送では媒体として光フアイバ
ケーブルを用いる検討もなされている。In conventional systems of this type, signal transmission was performed using electricity, and coaxial cables were the main transmission medium. However, since signal attenuation is significant in coaxial cables, studies are being made to use optical fiber cables as a medium for long-distance signal transmission.
ところで、ＣＡＴＶなどの信号伝送では、中継と同時に
多地点への分岐が必要である。例えば、第４図に示すよ
うに、センタから送られて中継器４０１へ到来した信号
を次の中継器４００でＡ〜Ｄ地点へ分岐する必要が生じ
る。かかる場合、従来の中継器４００は信号の減衰に対
応するための増幅と分岐とを行うだけで、出力は全て電
気信号とされていた。By the way, signal transmission such as CATV requires branching to multiple points at the same time as relaying. For example, as shown in FIG. 4, a signal sent from a center and arriving at a repeater 401 needs to be branched to points A to D at the next repeater 400. In such a case, the conventional repeater 400 only performs amplification and branching to cope with signal attenuation, and all outputs are electrical signals.
しかしながら、中継器４００から地点Ａ−Ｄまでの距離
は様々であり、例えば、Ａ地点が遠距離であると、中継
器４０２の数が膨大となって経済性、保守性の点から好
ましいものでなかった。−方、光フアイバケーブルを媒
体とする場合には、ある地点からある地点までの１対１
の伝送が基本であり、中継分岐の場合には同軸ケーブル
が用いられているだけであった。従って、中継地点から
多地点へ信号を分岐送信する場合の光フアイバケーブル
を用いた信号伝送システムの実現が求められる。However, the distance from the repeater 400 to points A to D varies; for example, if point A is a long distance, the number of repeaters 402 will be enormous, which is not preferable from the viewpoint of economy and maintainability. There wasn't. - On the other hand, when optical fiber cable is used as a medium, one-to-one communication from one point to another
transmission was the basic method, and coaxial cables were only used for relays and branches. Therefore, there is a need to realize a signal transmission system using optical fiber cables for branching and transmitting signals from a relay point to multiple points.
そこで本発明は、中継地点から信号の分岐を行って多地
点へ送信する場合に、各地点までの距離が様々であって
も適切な伝送手法による中継を可能とし、保守性、経済
性から最適なものを構築することができる信号伝送シス
テムを提供することを目的とする。Therefore, when branching a signal from a relay point and transmitting it to multiple points, the present invention enables relaying using an appropriate transmission method even if the distance to each point varies, and is optimal in terms of maintainability and economy. The purpose is to provide a signal transmission system that can be used to construct objects.
本発明に係る信号伝送システムは、信号を伝送路の中継
地点で分岐させて多地点へ伝送する信号伝送システムで
あって、上記中継地点には、電気信号の増幅分岐を行っ
て出力する増幅分岐手段を含み、この増幅分岐手段の出
力の少なくとも一つを光信号へ変換する電気／光変換器
を有する中継増幅器を備える。一方、上記多地点のうち
電気／光変換器の出力を受信する地点には、光／電気変
換器を含む第１の中継器を備える。そして、この多地点
のうち残りの地点には、電気信号を受信する受信手段を
含む第２の中継器を備えることを特徴とする。The signal transmission system according to the present invention is a signal transmission system in which a signal is branched at a relay point of a transmission path and transmitted to multiple points, and the relay point includes an amplification branch that amplifies and branches an electrical signal and outputs the signal. and an electrical/optical converter for converting at least one of the outputs of the amplifying and splitting means into an optical signal. On the other hand, a first repeater including an optical/electrical converter is provided at a point among the multiple points that receives the output of the electrical/optical converter. The remaining points among these multiple points are characterized by being equipped with second repeaters including receiving means for receiving electrical signals.
本発明に係る信号伝送システムは、以上の通りに構成さ
れるので、増幅分岐手段で増幅分岐した後に、送るべき
地点までの距離の遠近によって信号を光としてまたは電
気として送出することかでき、上記信号を受ける側では
第１の中１！器か第２の中継器かを備えて、光または電
気の信号に対応した受信が可能となる。Since the signal transmission system according to the present invention is configured as described above, after being amplified and branched by the amplifying and branching means, the signal can be transmitted as light or electricity depending on the distance to the point to be transmitted, and the above-mentioned On the side receiving the signal, it is 1st out of 1! It is possible to receive optical or electrical signals by providing either a receiver or a second repeater.
以下、添付図面の第１図ないし第３図を参照して、本発
明の一実施例を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings.
第１図は本発明の一実施例に係る信号伝送システムの構
成図である。この実施例では、センタから例えばＣＡＴ
Ｖの映像信号が送られて中継器１０１へ到り、更に中継
地点の中継増幅器１００へ与えられる。中継増幅器１０
０には増幅分岐手段１０２、電気／光変換器（Ｅ１０変
換器）１０３が設けられている。ここでは、Ａ地点が数
ｋ１１以上離れているため、Ｅ１０変換器１０３の出力
はＡ地点に備えられた第１の中継器１０４へ送出される
。第１の中継器１０４は光／電気変換器（０／Ｅ変換器
）１０５を有している。一方、中継増幅器１００から電
気信号として出力された映像信号は、Ｂ−Ｄ地点の第２
の中継器１０６へ到り、電気信号を受信する受信手段１
０７へ取込まれる。なお、この第１図の中継６１０１，
１０８゜１０９も第２の中継器１０６と同じ構成を有す
る。FIG. 1 is a configuration diagram of a signal transmission system according to an embodiment of the present invention. In this embodiment, for example, CAT
The V video signal is sent to the repeater 101, and is further applied to the repeater amplifier 100 at the repeater point. Relay amplifier 10
0 is provided with an amplification/branching means 102 and an electric/optical converter (E10 converter) 103. Here, since the A point is several k11 or more away, the output of the E10 converter 103 is sent to the first repeater 104 provided at the A point. The first repeater 104 has an optical/electrical converter (0/E converter) 105. On the other hand, the video signal output as an electrical signal from the relay amplifier 100 is
receiving means 1 for receiving the electrical signal and reaching the repeater 106 of
07. Note that the relay 6101 in FIG.
108° 109 also has the same configuration as the second repeater 106.
次に、中継増幅器１００の具体的構成を第２図を参照し
て説明する。Next, a specific configuration of the relay amplifier 100 will be explained with reference to FIG. 2.
中継増幅器１００の入力端子１から到来する電気信号は
、増幅器２により所要ゲインで増幅を受け、分岐器３を
介して出力端子４及び分配器５へ送出される。分岐器３
、分配器５はともにトランスによって構成され、前者は
信号を適当な比で分は後者は同−比で分けるものである
。分配器５の出力の一つはＥ１０変換器１０３へ与えら
れ電気信号に変換され、出力端子６から光フアイバケー
ブル（第１図の符号１１０）へ送出される。分配器５の
他の出力はそのまま（または図示せぬ増幅器で増幅され
て）出力端子７．７ から送出さｎ
れる。出力端子４，７、には同軸ケーブル１１１（第１
図）が接続される。The electrical signal arriving from the input terminal 1 of the relay amplifier 100 is amplified by the amplifier 2 with a required gain, and is sent to the output terminal 4 and the distributor 5 via the splitter 3. Turnout 3
, and divider 5 are both constituted by transformers, and the former divides the signal in an appropriate ratio, and the latter divides the signal in the same ratio. One of the outputs of the distributor 5 is applied to the E10 converter 103, where it is converted into an electrical signal, and sent from the output terminal 6 to the optical fiber cable (numeral 110 in FIG. 1). The other outputs of the distributor 5 are sent out from the output terminal 7.7 as they are (or after being amplified by an amplifier not shown). Coaxial cable 111 (first
Figure) is connected.
第３図には第１の中継器１０４の具体的構成が示されて
いる。FIG. 3 shows a specific configuration of the first repeater 104.
入力端子８は光フアイバケーブル１１０に接続され、到
来した光信号はＯ／Ｅ変換器１０５により電気信号に変
換され、増幅器９で所定ゲインの増幅を受ける。増幅さ
れた信号は分岐器１０で分岐され、出力端子１１及び増
幅器１２へ与えられる。増幅器１２で所定ゲインの増幅
を受けた信号は、分配器１３により分けられて出力端子
１４へ送られる。この第１の中継器１０４の出力端子１
１．１４は同軸ケーブル（第１図１１２）に接続される
か、終端される。分岐器１０、分配器１３の構成は、そ
れぞれ第２図に示された中継増幅器１００の分岐器３、
分配器５の構成に等しい。The input terminal 8 is connected to an optical fiber cable 110, and the incoming optical signal is converted into an electrical signal by an O/E converter 105, and amplified by an amplifier 9 to a predetermined gain. The amplified signal is branched by a splitter 10 and given to an output terminal 11 and an amplifier 12. The signal amplified to a predetermined gain by the amplifier 12 is divided by the distributor 13 and sent to the output terminal 14. Output terminal 1 of this first repeater 104
1.14 is connected or terminated to a coaxial cable (FIG. 1 112). The configurations of the splitter 10 and the splitter 13 are the splitter 3 and the splitter 3 of the relay amplifier 100 shown in FIG. 2, respectively.
This is equivalent to the configuration of distributor 5.
次に、第２の中継器１０６の構成を説明する。Next, the configuration of the second repeater 106 will be explained.
第２の中継器の構成は、第３図における第１の中１１！
器１０４のＯ／Ｅ変換器１０５を除去した構成に等しく
、入力端子８及び出力端子１１．１４には同軸ケーブル
（第１図の１１１）が接続される。The configuration of the second repeater is 11!
This is equivalent to the configuration in which the O/E converter 105 of the device 104 is removed, and a coaxial cable (111 in FIG. 1) is connected to the input terminal 8 and the output terminal 11.14.
このような中継増幅器１００、第１の中継器１０４、第
２の中継器１０６を用いて、中継地点より遠いＡ地点に
対しては中継増幅器１００の出力端子６から光フアイバ
ケーブル１１０を延ばすことができ、第４図の中継器４
０２を除去できる。Using such a relay amplifier 100, first repeater 104, and second repeater 106, it is possible to extend the optical fiber cable 110 from the output terminal 6 of the repeater amplifier 100 to point A, which is far from the relay point. Yes, repeater 4 in Figure 4
02 can be removed.
一方、中継地点から近い距離のＢ−Ｄ地点に対しては、
同軸ケーブル１１１を延ばして信号伝送ができる。つま
り、中継地点からの遠近に応じて信号の伝送媒体を変え
て分岐を行うことができ、保守性、経済性を考慮したシ
ステム設計を行い得るようになる。On the other hand, for points B-D which are close to the relay point,
Signal transmission can be performed by extending the coaxial cable 111. In other words, the signal transmission medium can be changed and branched depending on the distance from the relay point, and the system can be designed in consideration of maintainability and economic efficiency.
本発明は以上の実施例に限定されるものではなく種々の
変形が可能である。The present invention is not limited to the above embodiments, and various modifications are possible.
例えば、第２図の中継増幅器１００ではＥ１０変換器を
１つとしたが、分配器５と出力端子７との間にＥ１０変
換器を複数個設けてもよい。このようにすると、中継地
点から複数の遠隔地へ信号を光フアイバケーブルで送る
ことができるようになる。また、分岐器３．１０は２分
岐のものを示したが、次の中継器までの距離が近い場合
には３分岐以上であってもよい。For example, although the relay amplifier 100 in FIG. 2 uses one E10 converter, a plurality of E10 converters may be provided between the distributor 5 and the output terminal 7. In this way, signals can be sent from the relay point to multiple remote locations via optical fiber cables. Further, although the branching device 3.10 is shown as having two branches, it may have three branches or more if the distance to the next repeater is short.
以上、詳細に説明した通り本発明によれば、中継地点か
らの遠近によって信号分岐後の伝送媒体を適宜選択して
システム設定できるから、保守性、経済性から最適なも
のを構築することが可能となる。As explained above in detail, according to the present invention, the system can be set by appropriately selecting the transmission medium after signal branching depending on the distance from the relay point, so it is possible to construct an optimal system in terms of maintainability and economy. becomes.
第１図は本発明の一実施例に係る信号伝送システムの構
成図、第２図および第３図はそれぞれ第１図の信号伝送
システムの要部の構成図、第４図は従来の信号伝送シス
テムの構成図である。
１００・・・中継増幅器、１０２・・・増幅分岐手段、
１０３・・・Ｅ１０変換器、１０４・・・第１の中継器
、１０５・・・Ｏ／Ｅ変換器、１０６・・・第２の中継
器、１０７・・・受信手段、１１０・・・光フアイバケ
ーブル、１１１．１１２・・・同軸ケーブル。
！！［−伊ｊのＷｋ匠
第１図
特許出願人 住友電気工業株式会社
代理人弁理士 長谷用 芳 樹′ＪｖＬ９１
ｃＱ要’ｐｉｎｓ
” ２ ２Fig. 1 is a block diagram of a signal transmission system according to an embodiment of the present invention, Figs. 2 and 3 are block diagrams of main parts of the signal transmission system of Fig. 1, and Fig. 4 is a diagram of a conventional signal transmission system. FIG. 1 is a configuration diagram of a system. 100...Relay amplifier, 102...Amplification branching means,
103... E10 converter, 104... First repeater, 105... O/E converter, 106... Second repeater, 107... Receiving means, 110... Optical Fiber cable, 111.112...coaxial cable. ! ! [-Ij's Wk Takumi Figure 1 Patent Applicant Sumitomo Electric Industries Co., Ltd. Representative Patent Attorney Yoshiki Hase'JvL91
cQ required 'pins' 2 2
Claims (1)
信号伝送システムにおいて、 前記中継地点には、電気信号の増幅分岐を行って出力す
る増幅分岐手段を含みこの増幅分岐手段の出力の少なく
とも一つを光信号へ変換する電気／光変換器が設けられ
た中継増幅器が備えられ、前記多地点のうち前記電気／
光変換器の出力を受信する地点には光／電気変換器を含
む第１の中継器が備えられ、この多地点のうち残りの地
点には電気信号を受信する受信手段を含む第２の中継器
が備えられていることを特徴とする信号伝送システム。[Scope of Claims] A signal transmission system in which a signal is branched at a relay point of a transmission path and transmitted to multiple points, wherein the relay point includes an amplification and branching means for amplifying and branching an electrical signal and outputting the amplified and branched signal. A repeater amplifier is provided with an electrical/optical converter for converting at least one of the outputs of the branching means into an optical signal,
A first repeater including an optical/electrical converter is provided at a point receiving the output of the optical converter, and a second repeater including a receiving means for receiving an electrical signal is provided at the remaining points among the multiple points. A signal transmission system characterized by being equipped with a device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1048261A JPH02226924A (en) | 1989-02-28 | 1989-02-28 | Signal transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1048261A JPH02226924A (en) | 1989-02-28 | 1989-02-28 | Signal transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02226924A true JPH02226924A (en) | 1990-09-10 |
Family
ID=12798499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1048261A Pending JPH02226924A (en) | 1989-02-28 | 1989-02-28 | Signal transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02226924A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5750143A (en) * | 1980-09-11 | 1982-03-24 | Nec Corp | Optical cable communication system |
-
1989
- 1989-02-28 JP JP1048261A patent/JPH02226924A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5750143A (en) * | 1980-09-11 | 1982-03-24 | Nec Corp | Optical cable communication system |
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