JPS59111433A - Signal transmission system - Google Patents
Signal transmission systemInfo
- Publication number
- JPS59111433A JPS59111433A JP57220307A JP22030782A JPS59111433A JP S59111433 A JPS59111433 A JP S59111433A JP 57220307 A JP57220307 A JP 57220307A JP 22030782 A JP22030782 A JP 22030782A JP S59111433 A JPS59111433 A JP S59111433A
- Authority
- JP
- Japan
- Prior art keywords
- signal transmission
- optical fiber
- transmission
- station
- power
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
- H04B10/808—Electrical power feeding of an optical transmission system
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、光フアイバーケーブルを用い、光により信号
伝送を行なうようにしたループ伝送システムに係り、特
に各光信号伝送制御装置に対する遠隔監視制御が容易に
行なえるようにしたシステムに関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a loop transmission system in which optical fiber cables are used to transmit signals by light, and in particular, the present invention relates to a loop transmission system in which signal transmission is performed by light using optical fiber cables. It relates to a system that makes it easy to do so.
信号伝送端局となるそれぞれの場所に設置したほぼ同じ
構成の伝送制御装置を、ループ状の共通信号伝送路で結
合したループ伝送システムは、数多くの伝送端局を有す
るシステム内での任意の端局間での信号伝送を共通の伝
送路で効率的に行なうことができるので、鉄道通信シス
テムなどに適したシステムとして注目を集めているが、
このようなシステムのうち、光フアイバーケーブルをル
ープ状共通信号伝送路として用いるようにしたシステム
の一例を第１図に示す。A loop transmission system, in which transmission control devices with almost the same configuration installed at each location serving as signal transmission terminal stations, is connected via a loop-shaped common signal transmission path, can be used at any terminal in a system with a large number of transmission terminal stations. It is attracting attention as a system suitable for railway communication systems because it can efficiently transmit signals between stations using a common transmission path.
Among such systems, an example of a system in which an optical fiber cable is used as a loop-shaped common signal transmission path is shown in FIG.
図において、１は中央指令所、２，３は鉄道の駅施設、
４は光７アイパーケーブル、５は中央指今所１．駅施設
２，３などの通信端局にそれぞれ設置した伝送制御装置
、６は同じく処理装置、７は光ファイバー、８は光ファ
イバー７の接続点である。なお、９は後で説明するメタ
ル線で、１０はその接続点である。In the figure, 1 is the central command center, 2 and 3 are railway station facilities,
4 is the optical 7 eyeper cable, 5 is the central finger and 1. A transmission control device is installed at each communication terminal station such as the station facilities 2 and 3, 6 is a processing device, 7 is an optical fiber, and 8 is a connection point of the optical fiber 7. Note that 9 is a metal wire, which will be explained later, and 10 is a connection point thereof.
中央指令所１や各駅施設２，３など各端局に設置されて
いる伝送制御装置５は全て同じ構成のものが一般に使用
され、光信号の送出、受信機能を備え、ループ状に形成
されている光ファイバー７を介して光信号による相互伝
送を行ない、それぞれの処理装置６で端局内から取り込
んだデータを光ファイバー７からなるループ伝送路に送
出し、一方、自局宛のデータをループ伝送路から受取り
、それを処理装置６に出力し、自局内の各機器に与える
働きをし、これにより中央指令所１や駅施設２．３など
各端局間で必要なデータの授受を可能にする。The transmission control devices 5 installed at each terminal station, such as the central control center 1 and each station facility 2 and 3, are generally of the same configuration, and are equipped with optical signal sending and receiving functions, and are formed in a loop shape. Mutual transmission of optical signals is carried out via the optical fibers 7 located at each terminal, and each processing device 6 sends the data taken in from within the terminal station to the loop transmission line consisting of the optical fiber 7, while the data addressed to its own station is transmitted from the loop transmission line. It receives the data, outputs it to the processing device 6, and supplies it to each device within its own station, thereby making it possible to exchange necessary data between each terminal station such as the central control center 1 and station facilities 2.3.
なお、これら伝送制御装置５や処理装置６としては、マ
イコン（マイクロコンピュータ）ヲ用いてローカル的な
制御を行なうようにしたものが一般に用いられている。As the transmission control device 5 and the processing device 6, devices that perform local control using a microcomputer are generally used.
そして、このような光ファイノく一ケーブル４をループ
伝送路とするシステムによれば、電磁気的なノイズに対
して全くフリーなため、電気鉄道など電磁気ノイズレベ
ルの極めて高い施設に用いてもＳ／Ｎの低下の虞れが全
くなく、常に確実な伝送が得られることになる。According to a system using such a fiber-optic cable 4 as a loop transmission path, it is completely free from electromagnetic noise, so even if it is used in facilities with extremely high electromagnetic noise levels, such as electric railways, S/ There is no risk of a drop in N, and reliable transmission can always be obtained.
ところで、このような伝送システムにおいては、当然の
ことながら、それぞれの端局にある伝送制御装置５や処
理装置６を動作させるための電源が必要であり、これも
当然のことながら、これらの装置の電源がオフになって
いるときには光ファイバー９によるループ伝送路を介し
たデータ伝送は不可能になっている。By the way, such a transmission system naturally requires a power source to operate the transmission control device 5 and processing device 6 in each terminal station, and as a matter of course, these devices When the power of the optical fiber 9 is turned off, data transmission via the loop transmission line using the optical fiber 9 is disabled.
そこで、このような伝送システムを適用した鉄道システ
ムにおいて、
（１）各駅施設２，３において伝送制御装置５および処
理装置６の電源を毎朝始業時にオンし、終業時にオフす
るようにした場合。Therefore, in a railway system to which such a transmission system is applied, (1) In each station facility 2, 3, the power of the transmission control device 5 and the processing device 6 is turned on at the beginning of work every morning and turned off at the end of work.
（２） この伝送システムのデノ（ラグ■間にお（・
て、随時、各駅施設２，３における伝送制御装置５およ
び処理装置６の電源をオン・オフする場合。(2) This transmission system's denomination (between the lag and
In this case, the transmission control device 5 and the processing device 6 in each station facility 2, 3 are turned on and off at any time.
（３）同じくデバッグ期間において、各駅施設２゜３に
おける伝送制御装置５および処理装置６に対して選択さ
れた故障リセット指令を与える場合。(3) Similarly, during the debugging period, a selected failure reset command is given to the transmission control device 5 and processing device 6 in each station facility 2.3.
（４）上記（１）又は（２）において、電源オフ状態を
中央指令所で認識したい場合。(4) In (1) or (2) above, if you want the central control center to recognize the power off state.
などのそれぞれの場合には、それぞれの駅施設２゜３な
どで直接操作や検出を行なうか、或いは別の伝送システ
ムを用いて遠隔監視制御を行なう必要があり、従って、
従来の伝送システムでは、上記した場合の操作に多大の
労力と時間を要したり、操作が不可能であったり、或い
はコストアップが著しくなったりするという欠点があっ
た。In each of these cases, it is necessary to perform direct operation and detection at each station facility, or to perform remote monitoring and control using another transmission system.
Conventional transmission systems have disadvantages in that operations in the above cases require a great deal of effort and time, may be impossible, or significantly increase costs.
本発明の目的は、上記した従来技術の欠点を除き、ロー
コストで遠隔監視制御が容易に行なえるよう忙したルー
プ状伝送路による光通信方式の信号伝送システムを提供
するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical communication signal transmission system using a busy loop-shaped transmission path, which eliminates the drawbacks of the prior art described above and allows easy remote monitoring and control at low cost.
この目的を達成するため、本発明＆工、光フアイバーケ
ーブルにチェック用などのために本来設けられているメ
タル線を用（く各端局［川でのデータ伝送が光伝送系と
は独立に行なえるようにし、このメタル線による伝送系
によって上記した遠隔監視制御を行なうようにした点を
特徴とする。In order to achieve this objective, the present invention and work has been developed to utilize metal wires that are originally provided in optical fiber cables for checking purposes, etc. The present invention is characterized in that the above-mentioned remote monitoring and control is carried out using the metal wire transmission system.
以下、本発明による信号伝送システムの実施例を図面に
ついて説明する。Embodiments of the signal transmission system according to the present invention will be described below with reference to the drawings.
第２図は本発明の一実施例で、９＆工光フアイノ（−ケ
ーブル４に内蔵されて（・るメタルｉ、１０＆工その接
続点、１１は補助伝送装置の親装置、１２レエ補助伝送
装置の子装置であり、その他Ｑ丁第１図の従来例と同じ
である。Fig. 2 shows an embodiment of the present invention, in which 9&F optical fiber (-) is built into the cable 4 (metal i, 10&F) connection point, 11 is the parent device of the auxiliary transmission device, and 12 is the auxiliary transmission device. This is a child device of 1, and is otherwise the same as the conventional example shown in FIG.
メタル線９は周知のように光ファイノ（−ケーン。As is well known, the metal wire 9 is an optical fiber (-Kane).
ル４に一般的に内蔵されたものであり、その接続が容易
で、導通状態が簡単に得られると（・う特性を利用して
光ファイノ（−ケーブル４の布設工事などに際してのル
ート形成チェックや通話用として少くとも２本設けられ
て（・るものである。なお、このような光フアイバーケ
ーブル４の一例を第３図に断面図で示す。この第３図に
おいて、１３はケーブルの外被、１４はスペーサ、１５
はテンションメンバであり、これらにより４本の光ファ
イバー７を含むケーブルが形成され、さらに４本のメタ
ル線９が内蔵されている様子が充分に理解される。It is generally built into cable 4, and its connection is easy and continuity can be easily obtained. An example of such an optical fiber cable 4 is shown in a cross-sectional view in FIG. 3. In FIG. cover, 14 is a spacer, 15
is a tension member, and it is well understood that these form a cable including four optical fibers 7, and that four metal wires 9 are also built-in.
補助伝送装置の親装置１１は中央指令所ＩＫ、そして子
装置１２は各駅施設２，３にそれぞれ設けられ、光フア
イバーケーブル４に内蔵されているメタル線９を介して
それぞれ相互に並列に接続されている。The parent device 11 of the auxiliary transmission device is installed at the central control center IK, and the slave devices 12 are installed at each station facility 2 and 3, and are connected in parallel to each other via metal wires 9 built into the optical fiber cable 4. ing.
そして、親装置１１と谷子装置１２のそれぞれとは、多
周波数順次組合わせコード方式による多重伝送方式によ
り選択動作と、マルチチャンネルによるデータの相互伝
送動作が行なえるようになっており、かつ、このとき、
親装置１１と子装置１２のそれぞれとは、相互に信号の
授受が可能なように結合されているだけではなく、直流
的にも結合されており、これにより親装置１１からそれ
ぞれの子装置１２に対して直流電力がメタル線９を介し
て供給され、子装置１２はいずれも他に電源を求めるこ
となく、このメタル線９を介して親装置１１から供給さ
れている直流電力により信号伝送動作が行なえるように
なっている。Each of the parent device 11 and the Taniko device 12 is capable of performing selection operations and mutual data transmission operations using multi-channels using a multiplex transmission method using a multi-frequency sequential combination code method. When,
The parent device 11 and each of the child devices 12 are not only coupled so that they can exchange signals with each other, but also coupled in terms of direct current. DC power is supplied to the device via the metal wire 9, and the slave devices 12 perform signal transmission operations using the DC power supplied from the parent device 11 via the metal wire 9, without requiring any other power source. is now possible.
また、各駅施設２，３に設けられている子装置１２はそ
れぞれの伝送制御装置５及び処理装置６に接続され、中
央指令所１にある親装置１１から与えられる制御データ
に応じて各装ｆｉｌｔ５ 、６に対する電源のオン−オ
フ制御や選択的なリセット指令の入力などを行なうと共
に、各装置５，６の電源のオン・オフ状帳や故障態様を
表わす表示データを取込み、それを親装置１１に伝送す
る働きをする。In addition, the child devices 12 provided in each station facility 2, 3 are connected to the respective transmission control device 5 and processing device 6, and each device fil5 is connected to the respective transmission control device 5 and processing device 6, and each device , 6 and selectively inputs reset commands, etc., and also captures display data representing the power on/off state and failure mode of each device 5, 6, and sends it to the parent device 11. It functions to transmit information to
そこで、中央指令所１にある親装ｗ１１は、周期的、あ
るいは任意に各駅施設２，３０子装置１２の一つ又は複
数を同時に選択し、各伝送制御装置５及び処理装置６に
対する電源のオン・オフ制御や選択されたリセット指令
の供給を行なうと共に、それらに対する電源のオン・オ
フ状態やリセットすべき故障状態の確認などを行なうこ
とができ、中央指令所１における遠隔監視制御を光ファ
イバしかも、そのために他に独立した伝送路のためのケ
ーブル付設などは全く必要としない。Therefore, the master device w11 in the central control center 1 periodically or arbitrarily selects one or more of the child devices 12 of each station facility 2, 30 at the same time, and turns on the power to each transmission control device 5 and processing device 6.・In addition to supplying off control and selected reset commands, it is also possible to check the on/off status of the power supply and the failure status that should be reset. Therefore, there is no need to install cables for other independent transmission paths.
従って、この実施例によれば、光フアイバーケーブル４
以外の伝送路を要せずに各伝送制御装置５および処理装
置６に対する中央指令所１からの遠隔監視制御を行なう
ことができるから、ローコストで各駅施設２，３におけ
る個別の操作を要しない信号伝送システムを得ることが
でき、しかも、その際、各子装置１２に対する独立した
電源供給を要しないから、構成が間単に済む。Therefore, according to this embodiment, the optical fiber cable 4
Since remote monitoring and control of each transmission control device 5 and processing device 6 from the central control center 1 can be performed without requiring any other transmission path, it is possible to perform signal control at low cost and without requiring individual operations at each station facility 2, 3. A transmission system can be obtained, and since an independent power supply to each child device 12 is not required, the configuration is simple.
なお、以上の実施例では、親装置１１と子袋＃１２から
なる補助伝送装置が多周波数順次組合わせコード方式に
よる多重通信システムとなっているが、本発明はこれに
限らず、時分割多重通信システムなど任意の多重化シス
テムで実施可能なことはいうまでもない。In the above embodiment, the auxiliary transmission device consisting of the parent device 11 and the child bag #12 is a multiplex communication system using a multi-frequency sequential combination code system, but the present invention is not limited to this, and the present invention is not limited to this. Needless to say, this method can be implemented in any multiplex system such as a communication system.
また、メタル線９による信号伝送と電源供給も、直流に
よる電源供給に限らず、商用交流周波数による電源供給
方式としてもよいのはいうまでもなく、さらに、電源供
給をメタル＃Ｊ９を介して行なわず、各子装置１２ごと
に独立して行なうようにしてもよい。なお、この場合、
子装置１２の電源オン・オフ制御を中央指令所１から行
なうようにするのは困難になるが、子装置１２による′
電力消費は一般にかなり少ない場合が多いから、子装置
１２の電源は常時オンに保っておくようにしてもよい。Furthermore, it goes without saying that the signal transmission and power supply via the metal wire 9 are not limited to DC power supply, but may also be powered by a commercial AC frequency. Alternatively, the process may be performed independently for each child device 12. In this case,
Although it will be difficult to control the power on/off of the slave devices 12 from the central control center 1,
Since power consumption is generally quite low in many cases, the slave device 12 may be kept powered on at all times.
以上説明したように、本発明によれば、本来必要とする
光フアイバーケーブル以外の伝送路を用いることなく、
中央指令所など任意の端局から駅施設など他の端局の伝
送制御装置および処理装置などに対する遠隔監視制御を
確実に行なうことができるから、従来技術の欠点を除き
、駅ごとでの個別の操作や監視が不要で、しかもローコ
ストの光フアイバーケーブルによる信号伝送システムを
容易に提供できる。As explained above, according to the present invention, without using any transmission path other than the originally required optical fiber cable,
Since remote monitoring and control of transmission control equipment and processing equipment of other terminal stations such as station facilities can be reliably performed from any terminal station such as a central control center, it is possible to eliminate the drawbacks of the conventional technology and eliminate the need for individual control at each station. It is possible to easily provide a low-cost signal transmission system using optical fiber cables that requires no operation or monitoring.
第１図は光ファイバーを用いたループ伝送方式鈍よる信
号伝送システムや従来例を示す全体構成図、第２図は本
発明による信号伝送システムの一実施例を示す全体構成
図、第３図は光フアイバーケーブルの一例を示す断面図
である。
１・・・・・・中央指令所、２，３・・・・・・駅施設
、４・・・・・・光フアイバーケーブル、５・・・・・
・伝送制御装置、６・・・・・・処理装置、７・・・・
・・光ファイバー、８・・・・・・接続点、９・・・・
・・メタルＨ、ｔｏ・・・・・・接続点、１１・・・・
・・補助伝送装置の親装置、１２・・・・・・補助伝送
装置の子装置。
１３・・・・・・ケーブルの外被、 １４・・・・・・
スペーサ、１５・・・・・・テンションメンバ。
第１図
第２図
１Ｉ３図Figure 1 is an overall configuration diagram showing a conventional signal transmission system using a loop transmission method using optical fibers, Figure 2 is an overall configuration diagram showing an embodiment of a signal transmission system according to the present invention, and Figure 3 is an optical FIG. 2 is a cross-sectional view showing an example of a fiber cable. 1... Central command center, 2, 3... Station facilities, 4... Optical fiber cable, 5...
・Transmission control device, 6... Processing device, 7...
...Optical fiber, 8...Connection point, 9...
...Metal H, to...Connection point, 11...
... Parent device of the auxiliary transmission device, 12... Child device of the auxiliary transmission device. 13... Cable sheath, 14...
Spacer, 15...Tension member. Figure 1 Figure 2 Figure 1I3
Claims (1)
によるループ状共通信号伝送路で結合してなる信号伝送
システムにおいて、上記複数の光信号伝送制御装置のそ
れぞれに電気的信号による信号伝送制御装置を設け、上
記光フアイバーケーブルに含まれているメタル線を介し
て上記光信号伝送制御＠置１のそれぞれの動作を遠隔監
視制御するように構成上たことを特徴とする信号伝送シ
ステム。 ２、特許請求の範囲、第１項において、上記電気的信号
による信号伝送制御装置のうち、特定のものが上記メタ
ル線を介して信号の授受を行なうと共に電源の供給を行
なうように構成され、他の特定のものが上記メタル線を
介して信号の授受を行なうと共にそれ自身の動作電力の
供給を受けるように構成されていることを特徴とする信
号伝送システム。[Claims] 1. In a signal transmission system in which a plurality of optical signal transmission control devices are coupled through a loop-shaped common signal transmission path using an optical fiber cable, an electrical signal is transmitted to each of the plurality of optical signal transmission control devices. A signal transmission control device according to the present invention is provided, and is configured to remotely monitor and control each operation of the optical signal transmission control @ 1 via a metal wire included in the optical fiber cable. transmission system. 2. In claim 1, a specific one of the signal transmission control devices using electrical signals is configured to send and receive signals and supply power through the metal wire, A signal transmission system characterized in that the other specific device is configured to send and receive signals via the metal wire and receive its own operating power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57220307A JPS59111433A (en) | 1982-12-17 | 1982-12-17 | Signal transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57220307A JPS59111433A (en) | 1982-12-17 | 1982-12-17 | Signal transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59111433A true JPS59111433A (en) | 1984-06-27 |
| JPH0418492B2 JPH0418492B2 (en) | 1992-03-27 |
Family
ID=16749089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57220307A Granted JPS59111433A (en) | 1982-12-17 | 1982-12-17 | Signal transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59111433A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6277788A (en) * | 1985-09-30 | 1987-04-09 | Sumitomo Electric Ind Ltd | Tv signal transmission system and cable for transmitting tv signal |
| JPS63108843A (en) * | 1986-10-27 | 1988-05-13 | Nippon Telegr & Teleph Corp <Ntt> | Method for recovering fault of subscriber optical fiber cable |
| EP1480357A2 (en) * | 2003-05-23 | 2004-11-24 | Sony Corporation | Optical communication system, optical communication apparatus, and optical cable |
| US10110304B2 (en) | 2016-06-22 | 2018-10-23 | Fujitsu Limited | Communication device and inspection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147844A (en) * | 1979-05-09 | 1980-11-18 | Fujitsu Ltd | Electric power source controlling system of optical communication system |
| JPS56141636A (en) * | 1980-04-04 | 1981-11-05 | Nippon Telegr & Teleph Corp <Ntt> | Supervisory system of optical fiber cable transmission line |
| JPS5768939A (en) * | 1980-10-16 | 1982-04-27 | Fuji Electric Co Ltd | Remote power supply applying system for port for optical data way system |
-
1982
- 1982-12-17 JP JP57220307A patent/JPS59111433A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147844A (en) * | 1979-05-09 | 1980-11-18 | Fujitsu Ltd | Electric power source controlling system of optical communication system |
| JPS56141636A (en) * | 1980-04-04 | 1981-11-05 | Nippon Telegr & Teleph Corp <Ntt> | Supervisory system of optical fiber cable transmission line |
| JPS5768939A (en) * | 1980-10-16 | 1982-04-27 | Fuji Electric Co Ltd | Remote power supply applying system for port for optical data way system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6277788A (en) * | 1985-09-30 | 1987-04-09 | Sumitomo Electric Ind Ltd | Tv signal transmission system and cable for transmitting tv signal |
| JPS63108843A (en) * | 1986-10-27 | 1988-05-13 | Nippon Telegr & Teleph Corp <Ntt> | Method for recovering fault of subscriber optical fiber cable |
| EP1480357A2 (en) * | 2003-05-23 | 2004-11-24 | Sony Corporation | Optical communication system, optical communication apparatus, and optical cable |
| EP1480357A3 (en) * | 2003-05-23 | 2005-01-12 | Sony Corporation | Optical communication system, optical communication apparatus, and optical cable |
| US7079733B2 (en) | 2003-05-23 | 2006-07-18 | Sony Corporation | Optical communication system, optical communication apparatus, and optical cable |
| US10110304B2 (en) | 2016-06-22 | 2018-10-23 | Fujitsu Limited | Communication device and inspection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0418492B2 (en) | 1992-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0359178B1 (en) | Load control system | |
| JPS62268646A (en) | Controller to printer | |
| JPS59111433A (en) | Signal transmission system | |
| CN1084286C (en) | Elevator equipment | |
| JPH02166946A (en) | Line concentration device for loop type local area network | |
| JP2894544B2 (en) | Distribution line remote monitoring and control system | |
| JP2001063577A (en) | Automatic block signal control device | |
| JPH0470839B2 (en) | ||
| JP4338815B2 (en) | Driving direction control device | |
| JP2506232B2 (en) | Data transmission equipment | |
| JPS63262995A (en) | Power control system for concentrated wiring system | |
| KR900002954B1 (en) | Method and devices of multi-remote control of sending back communication of a power line | |
| JPH10108365A (en) | Power distribution system monitor/controller | |
| JPS5939132A (en) | Optical interface system | |
| JP2590852B2 (en) | Optical network system | |
| JPH02241243A (en) | Automatic power control system | |
| JPS62109447A (en) | Transmission system | |
| JP2003125027A (en) | Supervisory controller | |
| JPS61112494A (en) | Remote supervisory and controlling equipment | |
| JPS6014301A (en) | Integrated controller | |
| JPS617746A (en) | Two-way data communication device for computer | |
| JPS63300691A (en) | Monitor control system | |
| JPS59154839A (en) | Transmission control system | |
| JPH10341424A (en) | Catv power supply system | |
| JPS62265826A (en) | Optical signal converter with high pass function |