JPS6143036A - Remote supervisory and controlling equipment - Google Patents

Remote supervisory and controlling equipment

Info

Publication number
JPS6143036A
JPS6143036A JP59165108A JP16510884A JPS6143036A JP S6143036 A JPS6143036 A JP S6143036A JP 59165108 A JP59165108 A JP 59165108A JP 16510884 A JP16510884 A JP 16510884A JP S6143036 A JPS6143036 A JP S6143036A
Authority
JP
Japan
Prior art keywords
transmission line
station
transmission
master station
slave
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
Application number
JP59165108A
Other languages
Japanese (ja)
Other versions
JPH0714160B2 (en
Inventor
Takeo Toda
武男 戸田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP59165108A priority Critical patent/JPH0714160B2/en
Publication of JPS6143036A publication Critical patent/JPS6143036A/en
Publication of JPH0714160B2 publication Critical patent/JPH0714160B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To transmit a signal without hindrance even with a defective position of a transmission line by connecting a master station and plural slave stations with two pairs of loop system transmission lines, using each one pair as trnsmission and reception and connecting the line to the devices via a branching device. CONSTITUTION:When the left-hand systems 101, 103 and the right-hand systems 203, 201 of transmission lines are both normal, a call signal from the master station 10 to slave stations 20, 30 is outputted to the transmission lines 101, 203 via a transceiver 11, a modulator 12 and a hybrid transformer HB14. The slave stations 20, 30 input respectively a call signal from the transmission line 101 or 102 and when it is a call signal to the own station, a line switch 24 or 34 is closed to transmit the information of the slave station to the master station 10 through the transmission line 201 or 202. If a defect takes place in the transmission lines 102, 202 for example, the slave station 30 changes over transmission line switches 35a, 35b on the condition that the call signal of the master station is not received. Thus, the call signal is inputted from the transmission line 203 and the information from the slave station 30 is transmitted to the master station 10 via the transmission line 103.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、遠方監視制御装置、特KfI!−リンダ方゛
式における伝送路切換器のバックアップ対策を施した遠
方監視制御装置に関するものである。′ポーリング方式
の遠方監視制御装置(以下テレコンと云う)のm−構成
社、第2図に示されるようにテレーンの制御所装置(以
下親局と云う)10と複数の被制御所装置(以下子局と
云う)全0゜、この間を2対(又は1対)の伝送 路101,201で結び、各子局2G 、30と伝送路
101,201とos絖は分岐部40 、50を介する
こと、が一般的である。そして親−及び子局の送受信部
分に関する楓成は、送受信器11゜21.31と変調器
M12.22.32及び復調器Dl:1.2B、S1を
基本とし、子局には変調@M:!13mとハイブリット
・トランス42゜52との間にラインスイッf24.3
4をもうける。
[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a remote monitoring and control device, special KfI! - This invention relates to a remote monitoring and control device that takes backup measures for a transmission line switch in the Linda method. 'M-configuration company of polling type remote monitoring and control equipment (hereinafter referred to as telecontroller), as shown in Fig. These are connected by two pairs (or one pair) of transmission lines 101, 201, and each slave station 2G, 30, transmission line 101, 201, and OS cable are connected via branch parts 40, 50. This is common. The transmission/reception part of the parent and slave stations is based on a transmitter/receiver 11°21.31, a modulator M12.22.32, and a demodulator Dl:1.2B, S1, and the slave station has a modulation@M :! Line switch f24.3 between 13m and hybrid transformer 42゜52
Produce 4.

次にポーリング方式の基本動作を説明する。この方式の
基本は同一の伝送路につなが−る複数の子局と親局との
間でデータの授受を行なうに際して、共有の伝送路を時
分割で使用するものである。親局10は各子局20.3
0の情報を伝送させるために、次のような動作を繰シ返
して行なう。即ち、親局lOは例えば子局20(2)情
報を得るタイミングになると、送受信器11よシ子局2
0を呼び出す信号を変調器M12を介して伝送路101
に送出する。各子局20.3Gは呼び出し信号を受信し
、これが自局に対する呼び出し信号であれば、ラインス
イッチ24又は34を閉じる。この場合は子局20の呼
び出し信号であるため、ラインスイッチ24が閉じられ
、子局20のみが伝送路201に接続される。そして子
局20はこれにより送受信器21よシ親局lOに対して
伝送すべき情報を変調器22を介して転送する。子局2
0は転送終了後、ラインスイッチ24を開く。一方、親
局10は子局20からの情報を受信し終ると、次の子局
例えば子局30を呼び出す信号を出力し、前記同様、子
局3G(2)情報を転送させる。このようにしてポーリ
ング方式は次々と子局を呼び出して伝送を行なわせるも
のである。
Next, the basic operation of the polling method will be explained. The basis of this system is to use a shared transmission path in a time-division manner when data is exchanged between a plurality of slave stations and a master station connected to the same transmission path. The master station 10 has each slave station 20.3
In order to transmit information of 0, the following operation is repeatedly performed. That is, when the time comes for the master station IO to obtain information about the slave station 20(2), for example, the master station
A signal calling 0 is sent to the transmission path 101 via the modulator M12.
Send to. Each slave station 20.3G receives the calling signal, and closes the line switch 24 or 34 if it is a calling signal for its own station. In this case, since it is a calling signal for the slave station 20, the line switch 24 is closed and only the slave station 20 is connected to the transmission line 201. The slave station 20 thereby transfers the information to be transmitted from the transmitter/receiver 21 to the master station IO via the modulator 22. Child station 2
0 opens the line switch 24 after the transfer is completed. On the other hand, when the master station 10 finishes receiving the information from the slave station 20, it outputs a signal to call the next slave station, for example, the slave station 30, and transfers the information to the slave station 3G(2) as described above. In this manner, the polling method calls slave stations one after another and causes them to perform transmission.

〔背景技術の問題点〕[Problems with background technology]

上記構成を有するテレコン装置において、伝送路に不良
が生じると、不良が発生した地点以降の伝送路に接続さ
れた子局の情報が伝送できなくなる。これは1伝送路で
複数の子局と伝送を行なう方式にあっては大きな問題で
ありしたがって伝送路の多重化などが必要となる。
In the teleconverter device having the above configuration, if a fault occurs in the transmission line, information of slave stations connected to the transmission line after the point where the fault occurs cannot be transmitted. This is a big problem in a system in which transmission is performed with a plurality of slave stations through one transmission line, and therefore requires multiplexing of the transmission lines.

〔発明の目的〕[Purpose of the invention]

本発明は上記問題点を解決するためになされたものであ
りポーリング方式における伝送路の1ケ所の不良時に、
支障なく伝送を可能とした遠方監視制御装置を提供する
ことを目的としている。
The present invention was made in order to solve the above problems, and when there is a failure at one point in the transmission line in the polling method,
The object of the present invention is to provide a remote monitoring and control device that enables transmission without any problems.

〔発明の概要〕[Summary of the invention]

本発明では親局と子局との間を2対のループ系伝送路に
よって接続し、この伝送路の片方向のl対を送信用とし
、他の片方向の1対主受信用として2個の分岐器によっ
て親局と接続し、子局側ではループ系伝送路1対毎2個
、計4個、の分岐を介して接続し、更に伝送路切換器に
よシ′伝送方向を変えるようにしたものである。
In the present invention, the master station and the slave stations are connected by two pairs of loop transmission lines, one pair in one direction of these transmission lines is used for transmission, and one pair in the other direction is used for main reception. It is connected to the master station through a brancher, and on the slave station side, it is connected through a total of four branches, two for each pair of loop system transmission lines, and a transmission line switch is used to change the direction of transmission. This is what I did.

〔発明の実施例〕[Embodiments of the invention]

以下図面を参照して実施例を説明する。第1、図は本発
明による遠方監視制御装置の一実施例構成図である。第
1図において第2図と同一部分につ仏ては同一符号をつ
けてすを省略する・4第1図において、ハイプリ、ッ′
ト・トランス14を経由して親局へ戻りハイブリット・
トランス15を介して左回シ系の1対の伝送路を構成し
、又、ハイブリット・トランス14の他方からの伝送路
203は、各子局30.20を経由して親局□へ戻りハ
イプリ、ト・トランス15を介し゛て右回シ系の他の1
対の伝送路を構成し、前記した左回シ系及び右回シ系の
各伝送路によシルーグ系の“伝送路とする。これに対し
て子局は分岐部40゜50を介して夫々接続される。
Examples will be described below with reference to the drawings. The first figure is a configuration diagram of an embodiment of a remote monitoring and control device according to the present invention. In Figure 1, parts that are the same as those in Figure 2 are given the same reference numerals and are omitted.
Hybrid
A pair of left-handed transmission lines is configured via the transformer 15, and the transmission line 203 from the other side of the hybrid transformer 14 returns to the master station □ via each slave station 30 and 20. , the other one in the right-handed system via the transformer 15.
A pair of transmission lines is constructed, and each of the above-mentioned left-handed and right-handed transmission lines is used as a "transmission route" for the Silugu system.On the other hand, the slave stations are connected to each other via branch sections 40 and 50. Connected.

即ち、各分岐部40.50には各伝送路毎に2個ずりの
ハイブリット・トランス(41,43)。
That is, each branch 40, 50 has two hybrid transformers (41, 43) for each transmission line.

(42,44)及び(51:53) 、 (52,54
)を接、続し、各ハイブリット・トランスと各子局の伝
送路切換器F5m、、25b、35m、35bを介した
変調器22j32.復調器23.33への接続は次゛の
ようにする。
(42,44) and (51:53), (52,54
) are connected to the modulators 22j32 . Connections to the demodulators 23 and 33 are made as follows.

例えば子局20の場合で説明すると、復調器23に接続
される伝送路切換器25&には左回シ系、右回シ系共、
信4源に近いノ・イブリット・トランス41,421+
の線を接続し、変調−i2からの出力は信号源よシ遠い
位置にあるノーイブリッ゛ト・トランス44.43に接
続される。子局30も同様な接iを□行なう。
For example, in the case of the slave station 20, the transmission line switch 25& connected to the demodulator 23 has both a left-handed system and a right-handed system.
No Ibrit Trance 41,421+
The output from modulation-i2 is connected to a neutral transformer 44.43 located far from the signal source. The slave station 30 also performs a similar connection □.

この構成において信号の流れを説明する。今、伝送路が
両系共、又は使用系が正常である場合、親□局10iら
の鰺び出し信号は左回シ系伝送路101により又、各子
局からの上シ信号は右回シ系伝送路2’011202に
よシ伝送される。このため右回り系伝送路の上シ信号に
は親局10からの右回シ系の呼び出□し信号と、各子局
20.30からの情報信号との両方が伝送される。した
がって伝送方式としては呼び出し信号と情・報信号は同
時に伝送されない半2重伝送方式を使用する。
The flow of signals in this configuration will be explained. Now, if both transmission lines or the system in use is normal, the mackerel feed signals from the master station 10i etc. are transmitted through the left-handed transmission line 101, and the upper signals from each slave station are transmitted through the right-handed transmission line 101. It is transmitted through the system transmission line 2'011202. Therefore, both the clockwise calling signal from the master station 10 and the information signal from each slave station 20 and 30 are transmitted to the upper signal on the clockwise transmission path. Therefore, as a transmission method, a half-duplex transmission method is used in which the calling signal and the information signal are not transmitted simultaneously.

次に、この動作方式において゛、子局20の情報を呼び
出す場合を説明する。先ず、親局10は子局20を呼び
出す信号を送受信器11.変調器12及びハイブリット
・トランス14を介して左回シ系の伝送路101と右回
シ系の伝送路203とに出力する。
Next, a case will be described in which the information of the slave station 20 is called in this operating method. First, the master station 10 sends a signal to call the slave station 20 to the transmitter/receiver 11. The signal is output via the modulator 12 and the hybrid transformer 14 to the left-handed transmission line 101 and the right-handed transmission line 203.

一方、各子局20.30は左回シ系の伝送路101又1
02よシ呼び出し信号を夫々入力し、これが自局、例え
ば子局20に対するものであればラインスイッチ24を
閉じて、子局20の情報を出力する。この情報は親局1
0に対して右回シ系の伝送路201に伝送路切換器25
b1ハイプリ、ト・トランス43を通して転送される0
親局、      10は右回シ系の伝送路201に接
続されているハイブリット・トランス15及び復調器1
3を通りて送受信器11に入力される。これは子局30
の場合も同様である。即ち、全子局は伝送路が正常時、
通常の1重系と同様に、一方向から受信し、同じ方向へ
返送する。
On the other hand, each slave station 20.30 has a left-handed transmission line 101 or 1.
02 and 2 call signals are respectively input, and if this is for the own station, for example, the slave station 20, the line switch 24 is closed and the information on the slave station 20 is output. This information is the master station 1
A transmission line switch 25 is connected to the transmission line 201 of the clockwise rotation system for 0.
0 transferred through b1 high preamp transformer 43
A master station 10 is a hybrid transformer 15 and a demodulator 1 connected to a right-handed transmission line 201.
3 and is input to the transceiver 11. This is slave station 30
The same applies to the case of . In other words, when the transmission path is normal for all slave stations,
Similar to a normal single-layer system, data is received from one direction and sent back in the same direction.

この状態で例えば伝送路102又は102と202とに
不良が発生した場合を説明する。この場合、子局20は
伝送路の健全部分に接続されて−いるため正常に動作で
1!不が、子局30は親局10よシの呼び出し信号を受
信できないため、したがって上シ伝送路−202に対し
て情報を出力できない・この際1、親局10は子局30
からの情報の受信ができず、子局を含む伝送路の不良を
検出するが、親局lOの検出時間よりも子局30の検出
時間を短かく設定しであるため、子局30は親局lOの
呼び出し信号の受信不能を条件に、伝送路切換器35m
、35bを切換える。したがって呼び出し信号は右回シ
系の伝送路203から入力できるようになり又、子局3
0からの情報は左回シ系の伝送路103を介して親局1
0に伝送される。
A case will be described in which, for example, a failure occurs in the transmission line 102 or 102 and 202 in this state. In this case, the slave station 20 is connected to a healthy part of the transmission path, so it operates normally and the number is 1! However, since the slave station 30 cannot receive the calling signal from the master station 10, it cannot output information to the upper transmission line 202.In this case, the master station 10
The slave station 30 cannot receive information from the parent station and detects a defect in the transmission path including the slave station. However, since the detection time of the slave station 30 is set to be shorter than the detection time of the master station IO, the slave station 30 Transmission line switch 35m on the condition that the calling signal of station IO cannot be received.
, 35b. Therefore, the calling signal can be input from the transmission line 203 of the clockwise system, and the slave station 3
The information from 0 is sent to the master station 1 via the transmission path 103 of the left circuit.
Transmitted to 0.

次に伝送路202のみに不良が発生した場合を説明する
。この場合も前記同様子局20は正常に動作する。一方
、子局30は親局10かう、の呼び出し信号を受信して
自局の情報を伝送路20′2へ出力する。しかし伝送路
202が不良であるため親局10はこの信号を受信でき
ない。したがって親局10は子局30からの情報の受信
がないことを条件に、子局30に対して伝送路切換器3
5a。
Next, a case where a defect occurs only in the transmission line 202 will be described. In this case as well, the slave station 20 operates normally as described above. On the other hand, the slave station 30 receives the calling signal from the master station 10 and outputs its own information to the transmission line 20'2. However, because the transmission line 202 is defective, the master station 10 cannot receive this signal. Therefore, the master station 10 sends the transmission line switch 3 to the slave station 30 on the condition that no information is received from the slave station 30.
5a.

35bを切換える指令を出力する。即ち、子局30は親
局lOからの呼び出し信号を受信し、しかもこの呼び出
し信号に対する自局情報を正しく伝送路202へ出力し
たのであるから、伝送路202の不良をもはや検知し得
ない・したがって□親局10において、前記した子局3
0によ會検知時間よシも遅れた経過時間後に、伝送路2
02の不良を検知し、伝送路切換器35m、35bの切
換指令を出力する。そして子局30はこれを受信して伝
送路切換器を切換えることにより前記同様、親局10と
の伝送が可能となる・要 するにループ系を構成する一部伝送路の不良の場合も、
全く支障なく各局との伝送ができる。
Outputs a command to switch 35b. That is, since the slave station 30 has received the calling signal from the master station IO and has correctly outputted its own station information in response to this calling signal to the transmission line 202, it is no longer possible to detect a defect in the transmission line 202. □In the master station 10, the slave station 3 mentioned above
After an elapsed time delay of 0 and the meeting detection time, the transmission line 2
02 is detected and outputs a switching command for the transmission line switching devices 35m and 35b. Then, the slave station 30 receives this and switches the transmission line switch to enable transmission with the master station 10 as described above.In short, even if some of the transmission lines making up the loop system are defective,
Transmission with each station is possible without any problems.

第3図は″分岐部の他の実施例である・本実施例では右
回ル系及び左回シ系の各伝送路に挿入された各ハイブリ
ット・トランスの間に分離スイッチ、80をもうけ、あ
る部での伝送不良が全体に影響を与えないよう不要部を
切離そうとするものである・そして、この動作は親局か
らの指示、又は子局での手動によシ行なうことができる
。例えば伝送路1′02の点で不良が発生し、この点以
降にノイズを混入させ、4.子局30の上シ情報が伝送
路を切換えても親局10で受信できないときがある。
FIG. 3 shows another embodiment of the branch section. In this embodiment, a separation switch 80 is provided between each hybrid transformer inserted in each of the right-handed and left-handed transmission lines. The purpose is to disconnect unnecessary parts so that a transmission failure in one part does not affect the whole system.This operation can be performed by instructions from the master station or manually at the slave station. For example, if a failure occurs at a point in the transmission line 1'02, noise may be mixed in after this point, and the master station 10 may not be able to receive the information from the slave station 30 even if the transmission line is switched.

このときは親局10よシ子局20と30に分離スイッチ
80を開く指令を出し、子局20と30との間の伝送路
を完全に分離させる。これによシ全体を救うことができ
る。
At this time, the master station 10 issues a command to the slave stations 20 and 30 to open the separation switch 80, thereby completely separating the transmission path between the slave stations 20 and 30. This can save the whole city.

〔発明の効果〕〔Effect of the invention〕

以上説明した如く、本発明によれば親局と子局との間を
2対の伝送路とハイプリ、ト・トランスとによってルー
プ系の伝送路を構成し、子局側では伝送方向を切換える
ことができるよう構成したので伝送路の不良時に、子局
を別の伝送方向に切換えることができ、システムの稼動
率を著しく増大させることのできる遠方監視制御装置を
提供できる。
As explained above, according to the present invention, a loop system transmission line is constructed between a master station and a slave station by two pairs of transmission lines and a high-speed transformer, and the transmission direction can be switched on the slave station side. Since the present invention is configured so that it is possible to switch the slave station to another transmission direction in the event of a failure in the transmission path, it is possible to provide a remote monitoring and control device that can significantly increase the operating rate of the system.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明による遠方監視制御装置の一実施例構成
図、第2図は従来装装置の構成図1.第3図は分岐部の
他の実施例でるる・ 10・・・親局、      20.30・・・子局、
11.21.31・・・送受信器、 12.22.32
・・・変調器、13.2L33・・・復調器、 14、IL4i〜44.51〜54・・・ハイブリット
・トランス、24 、34・・・ラインスイッチ、 25m、25be35畠、35b・・・伝送路切換器、
101.102.10312G1,202.203−・
・伝送路、40.50・・・分岐部。 特許出願人  株式会社 東  芝 代理人  弁理士 石 井 紀 男 第1図
FIG. 1 is a configuration diagram of an embodiment of a remote monitoring and control device according to the present invention, and FIG. 2 is a configuration diagram of a conventional device. FIG. 3 shows another embodiment of the branching section. 10...Master station, 20.30...Slave station,
11.21.31...Transmitter/receiver, 12.22.32
...Modulator, 13.2L33...Demodulator, 14, IL4i~44.51~54...Hybrid transformer, 24, 34...Line switch, 25m, 25be35 Hatake, 35b...Transmission road switch,
101.102.10312G1,202.203-・
・Transmission line, 40.50...branch. Patent applicant Toshiba Corporation Agent Patent attorney Norio Ishii Figure 1

Claims (2)

【特許請求の範囲】[Claims] (1)制御所装置と被制御所装置とを伝送路によって接
続し、制御所装置からの呼び出し信号に応じて該当被制
御所装置が順次呼び出されて親局装置へ情報を転送する
ポーリング方式の遠方監視制御装置において、前記伝送
路は右回り系及び左回り系からなる2対のループ系伝送
路として各装置との間を分岐器を介して接続し、前記右
回り系及び左回り系の片方向の1対を送信用とし、他の
片方向の1対を受信用として2個の分岐器によって親局
へ接続すると共に、各子局はループ系伝送路の各1対毎
に2個、計4個の分岐器と伝送路切換器とをそなえたこ
とを特徴とする遠方監視制御装置。
(1) A polling method in which a control center device and a controlled center device are connected through a transmission line, and the controlled center device is sequentially called in response to a call signal from the control center device and transfers information to the master station device. In the remote monitoring and control device, the transmission path is connected to each device via a branch as two pairs of loop transmission paths consisting of a clockwise system and a counterclockwise system, and the clockwise system and counterclockwise system are One pair in one direction is used for transmission, and one pair in the other direction is used for reception, connected to the master station by two branchers, and each slave station has two branches for each pair of loop system transmission lines. , a remote monitoring and control device characterized by having a total of four branchers and a transmission line switch.
(2)被制御所装置の各1対毎2個の分岐器との間に伝
送路を切離すスイッチをそなえたことを特徴とする特許
請求の範囲第1項記載の遠方監視制御装置。
(2) The remote monitoring and control device according to claim 1, further comprising a switch for disconnecting the transmission line between each pair of controlled station devices and two branch switches.
JP59165108A 1984-08-07 1984-08-07 Remote monitoring controller Expired - Lifetime JPH0714160B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59165108A JPH0714160B2 (en) 1984-08-07 1984-08-07 Remote monitoring controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59165108A JPH0714160B2 (en) 1984-08-07 1984-08-07 Remote monitoring controller

Publications (2)

Publication Number Publication Date
JPS6143036A true JPS6143036A (en) 1986-03-01
JPH0714160B2 JPH0714160B2 (en) 1995-02-15

Family

ID=15806049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59165108A Expired - Lifetime JPH0714160B2 (en) 1984-08-07 1984-08-07 Remote monitoring controller

Country Status (1)

Country Link
JP (1) JPH0714160B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007180830A (en) * 2005-12-27 2007-07-12 Toshiba Corp Duplex monitoring control system and redundant switching method of the system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154905A (en) * 1978-05-29 1979-12-06 Fujitsu Ltd Information transfmitting and receiving system for loop- type information transmission line network
JPS5596744A (en) * 1979-01-17 1980-07-23 Nippon Signal Co Ltd:The Line disconnection unit
JPS57162531A (en) * 1981-03-31 1982-10-06 Anritsu Corp Electric communication system
JPS5910050A (en) * 1982-07-08 1984-01-19 Nec Corp Double loop transmitting system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54154905A (en) * 1978-05-29 1979-12-06 Fujitsu Ltd Information transfmitting and receiving system for loop- type information transmission line network
JPS5596744A (en) * 1979-01-17 1980-07-23 Nippon Signal Co Ltd:The Line disconnection unit
JPS57162531A (en) * 1981-03-31 1982-10-06 Anritsu Corp Electric communication system
JPS5910050A (en) * 1982-07-08 1984-01-19 Nec Corp Double loop transmitting system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007180830A (en) * 2005-12-27 2007-07-12 Toshiba Corp Duplex monitoring control system and redundant switching method of the system

Also Published As

Publication number Publication date
JPH0714160B2 (en) 1995-02-15

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