JP2629135B2 - Railway communication equipment and railway communication system - Google Patents
Railway communication equipment and railway communication systemInfo
- Publication number
- JP2629135B2 JP2629135B2 JP18351294A JP18351294A JP2629135B2 JP 2629135 B2 JP2629135 B2 JP 2629135B2 JP 18351294 A JP18351294 A JP 18351294A JP 18351294 A JP18351294 A JP 18351294A JP 2629135 B2 JP2629135 B2 JP 2629135B2
- Authority
- JP
- Japan
- Prior art keywords
- rail
- communication
- power line
- railway
- track
- 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 - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】この発明は、鉄道通信装置および
鉄道通信方式に関し、特に、鉄道事業に関する情報の伝
送を軌道を通信路として電力線通信を行うようにした鉄
道通信装置および鉄道通信方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway communication device and a railway communication system, and more particularly, to a railway communication device and a railway communication system for transmitting information on a railway business by power line communication using a track as a communication path.
【０００２】[0002]
【従来の技術】一般に、鉄道事業においては、業務を円
滑に遂行するために、各種業務機関を密接に結合してお
く必要がある。このため、各種業務機関間で情報の交換
を行う通信システムが必要である。2. Description of the Related Art Generally, in the railway business, various business organizations must be closely connected in order to smoothly carry out business. Therefore, a communication system for exchanging information between various business institutions is required.
【０００３】従来、この種の通信システムは、専用の通
信回線を用いて構築されている。Conventionally, this type of communication system has been constructed using a dedicated communication line.
【０００４】ところで、鉄道事業においては １）施設が連続的であり、広範囲に及んでいる ２）常時広範囲に移動している車両を管理、運営の対象
にしている ３）突発的事故等に際して処理を迅速かつ適確に行い、
利用者に対する影響を最小限にしなければならない 等の要求があり、その通信の内容も １）列車運転に関するもの ２）営業に関するもの 等の種々多様なものがある。By the way, in the railway business, 1) facilities are continuous and extend over a wide area. 2) vehicles that are constantly moving over a wide area are managed and operated. 3) Handling in the event of an unexpected accident, etc. Quickly and accurately,
There are requirements such as minimizing the impact on users, and there are various types of communications, such as 1) train operation and 2) sales.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
専用の通信回線を用いて構築される鉄道の通信システム
においては、 １）施設が広範囲に及んでいるため、専用の通信回線の
敷設コストが膨大なものになる ２）敷設した専用の通信回線の保守に多大な労力と人員
を要し、確実な通信の保持が難しい 等の問題あり、コスト面、情報伝送の確実性等から十分
満足するものとはいえない。However, in a conventional railway communication system constructed by using a dedicated communication line, 1) since the facilities cover a wide area, the installation cost of the dedicated communication line is enormous. 2) Maintenance of the dedicated communication line laid requires a great deal of labor and personnel, and it is difficult to maintain reliable communication. There are problems such as cost and reliability of information transmission. Not really.
【０００６】そこで、この発明は、システム構築のコス
トを低減することができ、かつ保守が容易で、信頼性の
高い情報の伝送を行うことができる新規な鉄道通信装置
および鉄道通信方式を提供することを目的とする。Accordingly, the present invention provides a novel railway communication apparatus and a new railway communication system which can reduce the cost of system construction, are easy to maintain, and can transmit highly reliable information. The purpose is to:
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、軌道に接続された少なくとも２つの電
力線通信モデムを具備し、上記電力線通信モデムを介し
て上記軌道を通信路とした電力線通信を行う鉄道通信装
置であって、上記軌道は、第１のレールと第２のレール
からなる１対のレールからなり、上記第１のレールと第
２のレールとの間は所定の抵抗を介して接続され、上記
第１のレールと架線との間に電源が接続されるとともに
上記第２のレールは大地に接続され、上記電力線通信モ
デムは、上記第１のレール、上記第２のレールと大地と
の間に接続され、上記第１のレールを第１チャネル、上
記第２のレールを第２チャネルとする２チャネル大地間
結合方式で情報の伝送を行うことを特徴とする。To achieve the above object, the present invention comprises at least two power line communication modems connected to a track, and the track is used as a communication path via the power line communication modem. A railway communication device for performing power line communication, wherein the track includes a pair of rails including a first rail and a second rail, and a predetermined resistance is provided between the first rail and the second rail. And a power supply is connected between the first rail and the overhead line, the second rail is connected to the ground, and the power line communication modem is connected to the first rail and the second rail. It is connected between a rail and the ground, and transmits information by a two-channel ground-to-ground coupling method in which the first rail is a first channel and the second rail is a second channel.
【０００８】また、この発明は、軌道に少なくとも２つ
の電力線通信モデムを接続し、上記電力線通信モデムを
介して上記軌道を通信路とした電力線通信を行う鉄道通
信方式であって、上記軌道は、第１のレールと第２のレ
ールからなる１対のレールからなり、上記第１のレール
と第２のレールとの間は所定の抵抗を介して接続され、
上記第１のレールと架線との間に電源が接続されるとと
もに上記第２のレールは大地に接続され、上記電力線通
信モデムは、上記第１のレール、上記第２のレールと大
地との間に接続され、上記第１のレールを第１チャネ
ル、上記第２のレールを第２チャネルとする２チャネル
大地間結合方式で情報の伝送を行うことを特徴とする。Also, the present invention is a railway communication system for connecting at least two power line communication modems to a track and performing power line communication using the track as a communication path via the power line communication modem. A pair of rails consisting of a first rail and a second rail, wherein the first rail and the second rail are connected via a predetermined resistance;
A power supply is connected between the first rail and the overhead line, and the second rail is connected to the ground. The power line communication modem is connected between the first rail and the second rail and the ground. The first rail is a first channel and the second rail is a second channel, and information is transmitted by a two-channel ground-to-ground coupling method.
【０００９】[0009]
【作用】この発明では、軌道に少なくとも２つの電力線
通信モデムを接続し、この電力線通信モデムを介して軌
道を通信路とする電力線通信を行うことで鉄道通信装置
を構築する。そして、上記軌道は、第１のレールと第２
のレールからなる１対のレールからなり、上記第１のレ
ールと第２のレールとの間は所定の抵抗またはインピー
ダンスを介して接続され、上記第１及び第２のレールと
架線との間に電源が接続されるとともに上記第１及び第
２のレールは大地に接続され、上記電力線通信モデム
は、上記第１のレール、上記第２のレールと大地との間
に接続され、上記第１のレールを第１チャネル、上記第
２のレールを第２チャネルとする２チャネル大地間結合
方式で情報の伝送を行うように構成することができる。
また、１チャネルとしても利用できる。According to the present invention, a railway communication device is constructed by connecting at least two power line communication modems to a track and performing power line communication using the track as a communication path via the power line communication modem. And the track is composed of the first rail and the second rail.
The first rail and the second rail are connected via a predetermined resistance or impedance, and between the first and second rails and the overhead wire. The power supply is connected and the first and second rails are connected to the ground. The power line communication modem is connected between the first rail, the second rail and the ground, and the first and second rails are connected to the ground. Information can be transmitted by a two-channel ground-to-ground coupling method in which a rail is a first channel and the second rail is a second channel.
It can also be used as one channel.
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【００１４】[0014]
【実施例】以下、この発明に係る鉄道通信装置および鉄
道通信方式の実施例を添付図面を参照して詳細に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a railway communication device and a railway communication system according to the present invention will be described below in detail with reference to the accompanying drawings.
【００１５】図１は、この発明に係る鉄道通信装置の一
実施例の概略構成をブロック図で示したものである。こ
の実施例の鉄道通信装置は、軌道を通信路とする電力線
通信を行うことで鉄道通信装置を構築する。FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a railway communication device according to the present invention. The railway communication device of this embodiment constructs a railway communication device by performing power line communication using a track as a communication path.
【００１６】図１において、１０は、図示しない電車が
走行する軌道であり、２０は、電車に対して駆動電源を
供給する架線である。軌道１０と架線２０との間には、
軌道１０および架線２０に給電するための電源５０が接
続されている。In FIG. 1, reference numeral 10 denotes a track on which a train (not shown) travels, and reference numeral 20 denotes an overhead line for supplying drive power to the train. Between the track 10 and the overhead wire 20,
A power supply 50 for supplying power to the track 10 and the overhead wire 20 is connected.
【００１７】軌道１０には、電力線モデム３０−１およ
び３０−２が接続され、この電力線モデム３０−１およ
び３０−２には通信端末４０−１および４０−２がそれ
ぞれ接続されている。The power line modems 30-1 and 30-2 are connected to the track 10, and communication terminals 40-1 and 40-2 are connected to the power line modems 30-1 and 30-2, respectively.
【００１８】ここで、電力線モデム３０−１および３０
−２は、軌道１０を電力線として電力線通信を行うもの
で、この電力線モデム３０−１および３０−２は、周波
数拡散方式による変調、復調を行うように構成されてお
り、この電力線モデム３０−１および３０−２としては
周知の構成のものを用いることができる。Here, the power line modems 30-1 and 30-1
-2 performs power line communication using the orbit 10 as a power line, and the power line modems 30-1 and 30-2 are configured to perform modulation and demodulation by a frequency spreading method. As 30-2 and 30-2, those having a known configuration can be used.
【００１９】今、通信端末４０−１と通信端末４０−２
との間で通信を行う場合を考えると、通信端末４０−１
と通信端末４０−２との間は、電力線モデム３０−１、
軌道１０、電力線モデム３０−２を介して接続されるこ
とになり、通信端末４０−１からの送信信号は、電力線
モデム３０−１で周波数拡散方式により変調されて、軌
道１０に送信され、軌道１０から通信端末４０−１から
の送信信号を受信した電力線モデム３０−２は、この信
号を周波数拡散方式により復調し、通信端末４０−２に
大地帰路方式で送出する。Now, the communication terminals 40-1 and 40-2
Considering the case where communication is performed with the communication terminal 40-1
And a communication terminal 40-2, a power line modem 30-1,
The orbit 10 is connected via the power line modem 30-2, and the transmission signal from the communication terminal 40-1 is modulated by the power line modem 30-1 by the frequency spread method, transmitted to the orbit 10, and transmitted to the orbit 10. The power line modem 30-2, which has received the transmission signal from the communication terminal 40-1 from the communication terminal 40-1, demodulates this signal by the frequency spread method and sends it to the communication terminal 40-2 by the ground return method.
【００２０】また、通信端末４０−２からの送信信号
は、電力線モデム３０−２で周波数拡散方式により変調
されて、軌道１０に送信され、軌道１０から通信端末４
０−２からの送信信号を受信した電力線モデム３０−１
は、この信号を周波数拡散方式により復調し、通信端末
４０−１に大地帰路方式で送出する。The transmission signal from the communication terminal 40-2 is modulated by the power line modem 30-2 by the frequency spreading method, transmitted to the orbit 10, and transmitted from the orbit 10 to the communication terminal 4.
Power line modem 30-1 that has received the transmission signal from O-2
Demodulates this signal by the spread spectrum method and sends it to the communication terminal 40-1 by the ground return method.
【００２１】このようにして通信端末４０−１と通信端
末４０−２との間で通信が行われる。Thus, communication is performed between the communication terminal 40-1 and the communication terminal 40-2.
【００２２】このような構成によると、既設の軌道１０
を通信路として通信端末４０−１と通信端末４０−２と
の間の通信が可能になり、また、通信路として軌道１０
を直接用いるので、 １）従来のように、専用の通信回線を新たに敷設する必
要はない ２）単位当りの信号減衰が小さい ３）構造上の強度が大きく、保守が容易で、かつ、安
定、適確な情報通信が可能になる 等の利点がある。According to such a configuration, the existing track 10
Between the communication terminal 40-1 and the communication terminal 40-2 can be used as a communication path.
1) There is no need to lay a new dedicated communication line as in the past 2) Signal attenuation per unit is small 3) Structural strength is large, maintenance is easy and stable There are advantages such as accurate information communication.
【００２３】図２は、この発明に係る鉄道通信装置の他
の実施例をブロック図で示したものである。なお、図２
において、図１に示した構成と同様の機能を果たす部分
には説明の便宜上図１で用いた符号と同一の符号を付す
る。FIG. 2 is a block diagram showing another embodiment of the railway communication device according to the present invention. Note that FIG.
In FIG. 7, portions having the same functions as those of the configuration shown in FIG. 1 are denoted by the same reference numerals as those used in FIG.
【００２４】この図２に示す実施例においては、図１に
示した軌道１０を構成する一対のレール１０−１、１０
−２をそれぞれ通信路とする２チャネル大地間結合方式
の電力線通信を行うように構成される。In the embodiment shown in FIG. 2, a pair of rails 10-1 and 10-1 constituting the track 10 shown in FIG.
The power line communication of the two-channel ground-to-ground coupling method using -2 as a communication path is performed.
【００２５】すなわち、この実施例において、軌道１０
を構成する一対のレール１０−１、１０−２の内の一方
のレール１０−１は電源５０に接続され、他方のレール
１０−２は接地されている。That is, in this embodiment, the orbit 10
Of the pair of rails 10-1 and 10-2 is connected to the power supply 50, and the other rail 10-2 is grounded.
【００２６】ここで、一対のレール１０−１、１０−２
の間には、所定の抵抗６０が接続されている。Here, the pair of rails 10-1 and 10-2
A predetermined resistor 60 is connected between them.
【００２７】また、一対のレール１０−１、１０−２は
電力線モデム３１−１に接続されるとともにこの電力線
モデム３１−１は接地され、更に、この電力線モデム３
１−１には通信端末４０−１が接続される。The pair of rails 10-1 and 10-2 are connected to a power line modem 31-1, and the power line modem 31-1 is grounded.
The communication terminal 40-1 is connected to 1-1.
【００２８】同様に、一対のレール１０−１、１０−２
は電力線モデム３１−２に接続されるとともにこの電力
線モデム３１−２は接地され、更に、この電力線モデム
３１−２には通信端末４０−２が接続される。Similarly, a pair of rails 10-1 and 10-2
Is connected to a power line modem 31-2, the power line modem 31-2 is grounded, and a communication terminal 40-2 is connected to the power line modem 31-2.
【００２９】ここで、電力線モデム３１−１および３１
−２は、レール１０−１、１０−２を電力線として電力
線通信を行うもので、電力線モデム３０−１および３０
−２と同様に、周知の周波数拡散方式による変調、復調
を行うものを用いることができる。Here, the power line modems 31-1 and 31
-2 performs power line communication using the rails 10-1 and 10-2 as power lines, and the power line modems 30-1 and 30-2.
Similarly to -2, a device that performs modulation and demodulation by a known frequency spreading method can be used.
【００３０】この構成において、通信端末４０−１と通
信端末４０−２との間では、レール１０−１を第１チャ
ネル、レール１０−２を第２チャネルとして２チャネル
大地間結合方式で情報の伝送を行うことができる。In this configuration, between the communication terminal 40-1 and the communication terminal 40-2, the rail 10-1 is used as a first channel and the rail 10-2 is used as a second channel to transmit information in a two-channel ground connection system. Transmission can take place.
【００３１】図３は、この発明に係る鉄道通信装置の更
に他の実施例をブロック図で示したものである。なお、
図３においても、図１および図２に示した構成と同様の
機能を果たす部分には説明の便宜上図１および図２で用
いた符号と同一の符号を付する。FIG. 3 is a block diagram showing still another embodiment of the railway communication device according to the present invention. In addition,
In FIG. 3 as well, portions that perform the same functions as those in the configurations shown in FIGS. 1 and 2 are denoted by the same reference numerals as those used in FIGS. 1 and 2 for convenience of explanation.
【００３２】この図３に示す実施例においては、一対の
レール１０−１、１０−２をそれぞれ通信路とする線間
結合方式の電力線通信を行うように構成される。The embodiment shown in FIG. 3 is configured to perform power line communication of a line coupling system using a pair of rails 10-1 and 10-2 as communication paths.
【００３３】すなわち、この実施例において、軌道１０
を構成する一対のレール１０−１、１０−２の内の一方
のレール１０−１は電源５０に接続され、他方のレール
１０−２は接地されている。That is, in this embodiment, the orbit 10
Of the pair of rails 10-1 and 10-2 is connected to the power supply 50, and the other rail 10-2 is grounded.
【００３４】ここで、一対のレール１０−１、１０−２
の間には、所定の抵抗６０が接続されている。Here, the pair of rails 10-1 and 10-2
A predetermined resistor 60 is connected between them.
【００３５】また、一対のレール１０−１、１０−２と
の間には電力線通信モデム３２−１が接続され、この電
力線モデム３２−１には通信端末４０−１が接続され
る。A power line communication modem 32-1 is connected between the pair of rails 10-1 and 10-2, and a communication terminal 40-1 is connected to the power line modem 32-1.
【００３６】同様に、一対のレール１０−１、１０−２
との間には電力線通信モデム３２−２が接続され、この
電力線モデム３２−２には通信端末４０−１が接続され
る。ここで、電力線モデム３２−１および３２−２も、
レール１０−１、１０−２を通信路として電力線通信を
行うもので、周知の周波数拡散方式による変調、復調を
行うものを用いることができる。Similarly, a pair of rails 10-1 and 10-2
Is connected to a power line communication modem 32-2, and a communication terminal 40-1 is connected to the power line modem 32-2. Here, the power line modems 32-1 and 32-2 also
A device that performs power line communication using the rails 10-1 and 10-2 as a communication path, and that performs modulation and demodulation using a well-known frequency spread method can be used.
【００３７】この構成において、通信端末４０−１と通
信端末４０−２との間では、レール１０−１、１０−２
を通信路とした線間結合方式の電力線通信を行うことが
できる。In this configuration, between the communication terminal 40-1 and the communication terminal 40-2, the rails 10-1, 10-2
Can be used as a communication path for line-to-line power line communication.
【００３８】[0038]
【発明の効果】以上説明したように、この発明によれ
ば、軌道に少なくとも２つの電力線通信モデムを接続
し、この電力線通信モデムを介して軌道を通信路とする
電力線通信を行うことで鉄道通信装置を構築するように
構成したので、以下に示すような効果を奏する。As described above, according to the present invention, at least two power line communication modems are connected to a track, and power line communication using the track as a communication path is performed via the power line communication modem, thereby enabling railway communication. Since the apparatus is configured to be constructed, the following effects can be obtained.
【００３９】１）従来のように、専用の通信回線を新た
に敷設する必要はなく、軌道を直接通信路として用いる
ことができるので、システム構築のコストを大幅な低減
することができる。1) Unlike the related art, it is not necessary to newly lay a dedicated communication line, and the track can be used as a direct communication path, so that the cost of system construction can be greatly reduced.
【００４０】２）軌道を直接通信路として用いるので、
単位当りの信号減衰が小さく、通信の信頼性が向上す
る。2) Since the orbit is used as a direct communication path,
Signal attenuation per unit is small, and communication reliability is improved.
【００４１】３）軌道を直接通信路として用いるので、
構造上の強度が大きく、保守が容易で、かつ、安定、適
確な情報通信が可能になる。3) Since the orbit is used as a direct communication path,
Structural strength is large, maintenance is easy, and stable and accurate information communication becomes possible.
【図１】この発明に係る鉄道通信装置の一実施例の概略
構成を示すブロック図。FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a railway communication device according to the present invention.
【図２】この発明に係る鉄道通信装置の他の実施例を示
すブロック図。FIG. 2 is a block diagram showing another embodiment of the railway communication device according to the present invention.
【図３】この発明に係る鉄道通信装置の更に他の実施例
を示すブロック図。FIG. 3 is a block diagram showing still another embodiment of the railway communication device according to the present invention.
１０ 軌道 １０−１、１０−２ レール ２０ 架線 ３０−１、３０−２ 電力線通信モデム ３１−１、３１−２ 電力線通信モデム ３２−１、３２−２ 電力線通信モデム ４０−１、４０−２ 通信端末 ５０ 電源 ６０ 抵抗 Reference Signs List 10 track 10-1, 10-2 rail 20 overhead line 30-1, 30-2 power line communication modem 31-1, 31-2 power line communication modem 32-1, 32-2 power line communication modem 40-1, 40-2 communication Terminal 50 Power supply 60 Resistance
Claims (2)
線通信モデムを具備し、上記電力線通信モデムを介して
上記軌道を通信路とした電力線通信を行う鉄道通信装置
であって、 上記軌道は、 第１のレールと第２のレールからなる１対のレールから
なり、 上記第１のレールと第２のレールとの間は所定の抵抗を
介して接続され、 上記第１のレールと架線との間に電源が接続されるとと
もに上記第２のレールは大地に接続され、 上記電力線通信モデムは、 上記第１のレール、上記第２のレールと大地との間に接
続され、上記第１のレールを第１チャネル、上記第２の
レールを第２チャネルとする２チャネル大地間結合方式
で情報の伝送を行うこと を特徴とする鉄道通信装置。1. A railway communication device comprising at least two power line communication modems connected to a track and performing power line communication using the track as a communication path via the power line communication modem.
A is, the track, the first rail and a pair of rails of a second rail
It becomes a predetermined resistance between the first rail and the second rail
When power is connected between the first rail and the overhead wire,
The second rail is connected to the ground, and the power line communication modem is connected between the first rail, the second rail and the ground.
The first rail is connected to the first channel, and the second rail is connected to the second rail.
Two-channel ground-coupling system with rail as second channel
A railway communication device characterized in that information is transmitted by means of a railway communication device.
ムを接続し、 上記電力線通信モデムを介して上記軌道を通信路とした
電力線通信を行う鉄道通信方式であって、 上記軌道は、 第１のレールと第２のレールからなる１対のレールから
なり、 上記第１のレールと第２のレールとの間は所定の抵抗を
介して接続され、 上記第１のレールと架線との間に電源が接続されるとと
もに上記第２のレールは大地に接続され、 上記電力線通信モデムは、 上記第１のレール、上記第２のレールと大地との間に接
続され、上記第１のレールを第１チャネル、上記第２の
レールを第２チャネルとする２チャネル大地間結合方式
で情報の伝送を行うことを特徴とする鉄道通信方式。 2. At least two power line communication models in orbit.
And the above-mentioned track is used as a communication path via the above-mentioned power line communication modem.
A railway communication system for performing power line communication , wherein the track includes a pair of rails including a first rail and a second rail.
It becomes a predetermined resistance between the first rail and the second rail
When power is connected between the first rail and the overhead wire,
The second rail is connected to the ground, and the power line communication modem is connected between the first rail, the second rail and the ground.
The first rail is connected to the first channel, and the second rail is connected to the second rail.
Two-channel ground-coupling system with rail as second channel
A railway communication system characterized in that information is transmitted by using a railway communication system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18351294A JP2629135B2 (en) | 1994-08-04 | 1994-08-04 | Railway communication equipment and railway communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18351294A JP2629135B2 (en) | 1994-08-04 | 1994-08-04 | Railway communication equipment and railway communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0851386A JPH0851386A (en) | 1996-02-20 |
| JP2629135B2 true JP2629135B2 (en) | 1997-07-09 |
Family
ID=16137144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18351294A Expired - Fee Related JP2629135B2 (en) | 1994-08-04 | 1994-08-04 | Railway communication equipment and railway communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2629135B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3082763B1 (en) * | 1999-03-29 | 2000-08-28 | 株式会社豊田自動織機製作所 | Communication system using feeder line |
| KR20010076510A (en) * | 2000-01-26 | 2001-08-16 | 김승돌 | Power line communication local area network apparatus |
| EP1168691A1 (en) * | 2000-06-08 | 2002-01-02 | Trend Network AG | Method for displaying information in a vehicle, which is powered using an electrical means, where the power line, which is used for transmission of electrical energy to the vehicle, is also used for transmitting data signals to the vehicle |
| JP3874352B2 (en) * | 2003-01-28 | 2007-01-31 | 株式会社日立製作所 | In-train communication system and in-train communication apparatus |
| KR101132854B1 (en) * | 2010-07-23 | 2012-04-03 | 민근홍 | Train position detection apparatus and its method by power line communication using trolley line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02150934A (en) * | 1988-12-01 | 1990-06-11 | Nec Off Syst Ltd | Monitor device |
-
1994
- 1994-08-04 JP JP18351294A patent/JP2629135B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0851386A (en) | 1996-02-20 |
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