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JPH0149066B2 - - Google Patents
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JPH0149066B2 - - Google Patents

Info

Publication number
JPH0149066B2
JPH0149066B2 JP57187552A JP18755282A JPH0149066B2 JP H0149066 B2 JPH0149066 B2 JP H0149066B2 JP 57187552 A JP57187552 A JP 57187552A JP 18755282 A JP18755282 A JP 18755282A JP H0149066 B2 JPH0149066 B2 JP H0149066B2
Authority
JP
Japan
Prior art keywords
transmission
command
issai
control device
data signal
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
Application number
JP57187552A
Other languages
Japanese (ja)
Other versions
JPS5977739A (en
Inventor
Sadao Mizokawa
Takushi Hamada
Masahiro Takahashi
Hitoshi Fushimi
Seiichi Yasumoto
Masakazu Okada
Hiroshi Tomizawa
Takeshi Oonuki
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57187552A priority Critical patent/JPS5977739A/en
Publication of JPS5977739A publication Critical patent/JPS5977739A/en
Publication of JPH0149066B2 publication Critical patent/JPH0149066B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42Loop networks
    • H04L12/437Ring fault isolation or reconfiguration

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

〔発明の利用分野〕 本発明は、二重系環状網システムに関する。 〔従来技術〕 第1図に二重系環状網システムの構成図を示
す。同図において、二重系環状網システムは互い
に伝送方向が異なる二系の伝送路(A系)3、
(B系)4に複数の伝送制御装置(ST)2と1つ
の監視制御装置(CST)1をループ状に接続し
た構成となつている。このシステムにおいて、
ST間の同区間においてA系、B系伝送路の二系
とも障害が発生した場合、該障害区間に接続され
た2つのSTがそれぞれCSTに向つてデータ信号
を折り返す、いわゆるループバツクを行ない障害
区間を切離して動作を継続させる。第2図は、
ST3,ST4間で障害が発生した場合に、ループバ
ツク構成となつた時のデータ信号の流れを示すも
のである。 さて、このようなループバツク構成へ移行する
場合の制御方法としては、従来様々な方法が考え
られている。 例えばCSTが伝送路障害を検出したならば、
各STに一斎指令を送出すると共に、該一斎指令
を受信した各STでは該一斎指令を二系の伝送路
へ折返えし、折返えした伝送路の受信側に正常に
該一斎指令を受信したときのみ前記折返えし動作
を解除することによりループバツク構成に移行す
る方式である。 本技術は例えば特開昭56−79552にも述べられ
ている。 ところが、この方式においては、伝送路のノイ
ズ等により該一斎指令が消滅するのを考慮して複
数回一斎指令を送出する場合、あるSTにおいて
は、CSTの下流のSTから送り返えされる一斎指
令と、CSTから送出される一斎指令を受信する
ことになり、どちらの一斎指令に従つて動作する
かが不定となる。 この一斎指令を複数回送出するということは、
信頼性を向上する為に不可欠であり、これができ
ないと一斎指令がノイズにより伝わらなかつた
STは伝送区間に異常がないのにもかかわらず
CSTから制御切離しの対象となつてしまう。 〔発明の概要〕 本発明は、複数回送出される一斎指令に対し
て、各STは現在受信選択している側の受信デー
タ信号がなくならない限り最初に一斎指令が伝送
されてきた伝送路のデータ信号に従つて動作する
よう該伝送路を選択し続ける。 〔発明の実施例〕 第3図以降の図面を用い、本発明の一実施例に
ついて詳細に説明する。 第3図に一般的なSTのブロツク構成図を示す。 STは、マイクロコンピユータ(μCOM)10
0、変調回路(MOD)26、復調回路
(DEMOD)27、系にデータ信号が流れている
か否かを検出(検出時は、高レベルを出力)する
検出回路(DETA)28、(DETB)25、一斎指
令(μCOM100を伝送路に接続するデータ信
号)を検出(検出時は、高レベルを出力)する検
出回路(DETCA)38、(DETCB)37、受信
回路(RA)34、(RB)35、送信回路(TA
33、(TB)36、A系伝送路に送出するデータ
信号を選択するマルチプレクサ(MPXA)31、
B系伝送路に送出するデータ信号を選択するマル
チプレクサ(MPXB)32、A系伝送路若しくは
B系伝送路をSR信号により選択してμCOM10
0の入力部に接なぐマルチプレクサ(MPXR)、
及びDETA、DETB、DETCA、DETCB、μCOM
からの出力により各マルチプレクサを制御する制
御回路(LoopCTL)5からなる。 尚、LoopCTL5からMPXRを制御する選択信
号SRは、高レベルの時はMPXRにA系伝送路を
選択させ、低レベルの時はMPXRにB系伝送路を
選択させる選択信号である。 このような構成において、A系伝送路のデータ
信号はRA34、B系伝送路のデータ信号はRB
5により受信され、MPXR30とLoopCTL5と
により選択入力されDEM27を介してμCOM1
00で解読される。μCOM100からの送信デー
タはMOD26により変調され、LoopCTL5に
より制御されたMPXA31及びMPXB31を介す
と共にTA33若しくはTB36により夫々の伝送
路へ送出される。(CSTのブロツク構成について
は、本願と同一出願人の例えば特開昭56−27478
号の明細書及び図面に詳細に記載されている。) 第4図に、制御回路(LoopCTL)5(第3
図)の詳細回路を示す。 LoopCTL5は、μCOM100から出力された
網構成選択信号をデコーダ511に入力して各マ
ルチプレクサを制御する状態と、一斎指令及びそ
のパターンにもとづき制御回路513により制御
する状態を有する。 前者の状態においては、デコーダ511の出力
はゲート518〜522を介し、フリツプフロツ
プ(F/F)523〜527にセツトされそれぞ
れ選択信号号(SR等、第3図)を出力する。又、
μCOM100からデコーダ511に有意なデータ
信号がないときは、選択信号Nが高レベルにな
り、制御回路513、ゲート517により選択制
御される。 検出器531〜534は、夫々に入力される
DETB、DETA、DETCB、DETCA(第3図)から
の出力の立ち上がりを検出してパルスを発生さ
せ、F/F523〜527のトリガ端子に加え
る。 以下、ST3,ST4間の両系伝送路に障害が発生
し、CST1(第1図)から一斎指令がA系伝送
路及び、B系伝送路に送出された場合の各STの
動作について説明する。 今、あるSTがA系若しくはB系伝送路から送
出されてきた一斎指令を受信したとすると、ST
内のDETCA若しくはDETCBは一斎指令を検出
(時刻t1)して高レベルを出力する(第5図a)。
この出力は、LoopCTLに入力され、検出器53
3若しくは534に加えられる。検出器533,
534は第5図bの出力の立ち下がり(時刻t2
をとらえてパルスを生させる。このパルスは、
SETパルスとしてフリツプフロツプ527のト
リガ端子に加えられ、この時のD入力端子の入力
レベルをラツチする。 この時のD入力端子の入力レベルは、DETA
しくはDETBの少なくとも一方は第6図bの時刻
ta以降のように高レベルとなつているから第1表
のようになる(図中「SR」とあるのは、SETパ
ルス発生直前の状態を示す。)。 尚、障害発生時はμCOM100から有意な制御
信号が出力されていないので、信号Nは高レベル
である。
[Field of Application of the Invention] The present invention relates to a dual ring network system. [Prior Art] Fig. 1 shows a configuration diagram of a dual ring network system. In the same figure, the dual ring network system has two transmission lines (A system) 3 with different transmission directions,
(B system) 4 has a configuration in which a plurality of transmission control devices (ST) 2 and one supervisory control device (CST) 1 are connected in a loop. In this system,
If a fault occurs in both the A and B transmission lines in the same section between STs, the two STs connected to the faulty section each return their data signals to the CST, performing a so-called loopback. disconnect and continue operation. Figure 2 shows
This shows the flow of data signals when a loopback configuration is established when a failure occurs between ST 3 and ST 4 . Various methods have conventionally been considered as control methods for transitioning to such a loopback configuration. For example, if CST detects a transmission line failure,
At the same time as sending the Issai command to each ST, each ST that received the Issai command loops back the Issai command to the second transmission line, and normally receives the Issai command on the receiving side of the looped back transmission line. This method shifts to the loop-back configuration by canceling the loop-back operation. This technique is also described in, for example, Japanese Patent Laid-Open No. 56-79552. However, in this method, if the Issai command is sent multiple times in consideration of the possibility that the Issai command will disappear due to noise in the transmission line, etc., in a certain ST, the Issai command sent back from the ST downstream of the CST Then, it will receive the Issai command sent from the CST, and it is unclear which Issai command it will operate according to. Sending this Issai command multiple times means that
This is essential to improve reliability; without this, the Issai command could not be transmitted due to noise.
Even though there is no abnormality in the transmission section of ST,
It becomes subject to control separation from CST. [Summary of the Invention] According to the present invention, when an Issai command is transmitted multiple times, each ST receives the Issai command from the transmission line where the Issai command was first transmitted, unless the receiving data signal on the side currently selected for reception is lost. The transmission path continues to be selected to operate according to the data signal. [Embodiment of the Invention] An embodiment of the present invention will be described in detail with reference to FIG. 3 and subsequent drawings. Figure 3 shows a block diagram of a typical ST. ST is microcomputer (μCOM) 10
0, modulation circuit (MOD) 26, demodulation circuit (DEMOD) 27, detection circuit (DET A) 28, (DET B ) that detects whether a data signal is flowing in the system (outputs a high level when detected ) ) 25, detection circuit (DETC A ) 38, (DETC B ) 37, receiving circuit (R A ) 34 that detects the Issai command (data signal that connects μCOM100 to the transmission line) (outputs high level when detected) , (R B )35, Transmission circuit (T A )
33, (T B ) 36, multiplexer (MPX A ) 31 that selects the data signal to be sent to the A-system transmission line;
The multiplexer (MPX B ) 32 selects the data signal to be sent to the B-system transmission line, and the A-system transmission line or the B-system transmission line is selected by the SR signal and the μCOM10
A multiplexer (MPX R ) connected to the 0 input section,
and DET A , DET B , DETC A , DETC B , μCOM
It consists of a control circuit (LoopCTL) 5 that controls each multiplexer using the output from the multiplexer. The selection signal SR that controls MPX R from LoopCTL 5 is a selection signal that causes MPX R to select the A-system transmission line when it is at a high level, and causes MPX R to select the B-system transmission line when it is at a low level. In such a configuration, the data signal of the A-system transmission line is R A 34, and the data signal of the B-system transmission line is R B 3.
5, is selectively inputted by MPX R 30 and LoopCTL5, and is sent to μCOM1 via DEM27.
It is decoded as 00. Transmission data from μCOM 100 is modulated by MOD 26, and transmitted to the respective transmission paths by TA 33 or TB 36 via MPX A 31 and MPX B 31 controlled by LoopCTL 5. (For the block structure of CST, for example, Japanese Patent Application Laid-Open No. 56-27478, filed by the same applicant as the present application)
It is described in detail in the specification and drawings of the issue. ) Figure 4 shows the control circuit (LoopCTL) 5 (3rd
Figure) shows the detailed circuit. LoopCTL 5 has a state in which the network configuration selection signal output from μCOM 100 is input to the decoder 511 to control each multiplexer, and a state in which it is controlled by the control circuit 513 based on the Issai command and its pattern. In the former state, the output of the decoder 511 is passed through gates 518-522 and set in flip-flops (F/F) 523-527 to output selection signals (SR, etc., FIG. 3), respectively. or,
When there is no significant data signal from μCOM 100 to decoder 511, selection signal N becomes high level, and selection is controlled by control circuit 513 and gate 517. Detectors 531 to 534 are each inputted with
A pulse is generated by detecting the rising edge of the output from DET B , DET A , DETC B , and DETC A (Fig. 3) and applied to the trigger terminals of F/Fs 523 to 527. Below, we will explain the operation of each ST when a failure occurs in both transmission lines between ST 3 and ST 4 and a one-time command is sent from CST 1 (Figure 1) to the A-system transmission line and the B-system transmission line. explain. Now, if a certain ST receives an Issai command sent from the A-system or B-system transmission line, the ST
DETC A or DETC B detects the Issai command (time t 1 ) and outputs a high level (FIG. 5a).
This output is input to LoopCTL and detector 53
3 or 534. detector 533,
534 is the fall of the output in Fig. 5b (time t 2 )
Captures and generates a pulse. This pulse is
It is applied as a SET pulse to the trigger terminal of flip-flop 527, and latches the input level of the D input terminal at this time. At this time, the input level of the D input terminal is at least one of DET A and DET B at the time shown in Figure 6b.
Since it is at a high level after ta, it becomes as shown in Table 1 ("SR" in the figure indicates the state immediately before the SET pulse is generated). Note that when a failure occurs, no significant control signal is output from the μCOM 100, so the signal N is at a high level.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、CSTからの一斎指令を繰返
し各STに送出しても、各STはデータ信号を受信
している限り一方の伝送路を選択し変えない為、
一斎指令の繰返しによる動作の不定を解決し、一
斎指令消滅よる正常区間のCSTからの制御切離
しという事態をさけることができる。 尚、本実施例では、二重系環状網システムは一
つのCSTと、複数のSTから構成されているが、
一つのSTにCSTの機能を持たせてもよい。つま
り、両系の障害を検知して、一斎指令を両系に送
出する機能を有する装置(CST又はST)が一つ
あれば本発明の効果を得ることができる。
According to the present invention, even if the Issai command from the CST is repeatedly sent to each ST, each ST selects one transmission path and does not change as long as it receives the data signal.
It is possible to solve the instability of the operation due to repetition of the Issai command, and to avoid the situation where control is disconnected from the CST in the normal section due to the disappearance of the Issai command. In this embodiment, the dual ring network system is composed of one CST and multiple STs.
One ST may have the function of CST. In other words, the effects of the present invention can be obtained if there is one device (CST or ST) that has the function of detecting a failure in both systems and sending a one-time command to both systems.

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

第1図、第2図は一般のループ式伝送システム
の説明図、第3図はSTのブロツク図、第4図は
LoopCTLのブロツ図、第5図a,bはDETC及
び検出器533,534の出力波形図、第6図
a,b,cは夫々伝送路上の信号、DET及び検
出器531,532の出力信号波形、第7図はル
ープバツク移行時の動作説明図である。 5……LoopCTL、25,28……DET、3
7,38……DETC、531〜534……検出
器、527……F/F、30……MPXR
Figures 1 and 2 are explanatory diagrams of a general loop transmission system, Figure 3 is a block diagram of an ST, and Figure 4 is an illustration of a general loop transmission system.
LoopCTL block diagram, Figure 5 a, b are output waveform diagrams of DETC and detectors 533, 534, Figure 6 a, b, c are signals on the transmission path, output signal waveforms of DET and detectors 531, 532, respectively. , FIG. 7 is an explanatory diagram of the operation at the time of loopback transition. 5...LoopCTL, 25, 28...DET, 3
7, 38...DETC, 531-534...detector, 527...F/F, 30...MPX R.

Claims (1)

【特許請求の範囲】 1 伝送方向の異なる二系のループ状伝送路と、
該二系伝送路に複数接続された伝送制御装置およ
び一つの監視制御装置又は監視制御機能を有する
伝送制御装置とを備え、該伝送制御装置間で前記
二系伝送路とも障害を起こした場合各伝送制御装
置は、該監視制御装置又は監視制御機能を有する
伝送制御装置が送出した一斎指令を二系伝送路へ
中継することによりループバツク構成をとる二重
系環状網システムにおいて、 前記各伝送制御装置は、夫々の系に対応して一
斎指令を検出する第一の検出回路と、夫々の系に
対応して一斎指令を含むデータ信号が流れている
ことを検出する第二の検出回路と、前記第一の検
出回路の出力と該第二の検出回路の出力を入力し
て、一斎指令が流れてきた伝送路が該二系の何ず
れであるかを該伝送路にデータ信号が流れること
を識別したときこれを記憶する記憶手段と、該記
憶手段の記憶内容に従つて伝送路を選択するマル
チプレクサとを設けたことを特徴とする二重系環
状網システム。 2 特許請求の範囲第1項の記載において、前記
記憶装置として最初に受信した一斎指令が流れて
きた伝送路を、該伝送路にデータ信号が流れ続け
る限り識別記憶する記憶手段としたことを特徴と
する二重系環状網システム。
[Claims] 1. Two loop-shaped transmission lines with different transmission directions;
In the case where a plurality of transmission control devices and one supervisory control device or a transmission control device having a supervisory control function are connected to the two-system transmission path, and a failure occurs in both of the two-system transmission paths between the transmission control devices, each The transmission control device is a dual-system ring network system that takes a loopback configuration by relaying a one-time command sent by the supervisory control device or a transmission control device having a supervisory control function to a second transmission path, and each of the transmission control devices described above. a first detection circuit that detects the Issai command corresponding to each system; a second detection circuit that detects that a data signal including the Issai command is flowing corresponding to each system; By inputting the output of the first detection circuit and the output of the second detection circuit, it is possible to determine which of the two transmission lines the Issai command is flowing through, and whether the data signal is flowing through the transmission line. What is claimed is: 1. A dual ring network system comprising: storage means for storing identification information when identified; and a multiplexer for selecting a transmission path according to the stored contents of the storage means. 2. In the description of claim 1, the storage device is characterized in that the storage device is a storage means that identifies and stores the transmission path through which the first received Issai command has flowed as long as the data signal continues to flow through the transmission path. Dual ring network system.
JP57187552A 1982-10-27 1982-10-27 Dual ring network system Granted JPS5977739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57187552A JPS5977739A (en) 1982-10-27 1982-10-27 Dual ring network system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57187552A JPS5977739A (en) 1982-10-27 1982-10-27 Dual ring network system

Publications (2)

Publication Number Publication Date
JPS5977739A JPS5977739A (en) 1984-05-04
JPH0149066B2 true JPH0149066B2 (en) 1989-10-23

Family

ID=16208072

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57187552A Granted JPS5977739A (en) 1982-10-27 1982-10-27 Dual ring network system

Country Status (1)

Country Link
JP (1) JPS5977739A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62176345A (en) * 1986-01-30 1987-08-03 Mitsubishi Electric Corp Duplicated system loop transmission control equipment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5941620B2 (en) * 1979-12-03 1984-10-08 三菱電機株式会社 Loopback method of dual loop transmission system

Also Published As

Publication number Publication date
JPS5977739A (en) 1984-05-04

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