JPS61255144A - Node equipment - Google Patents

Node equipment

Info

Publication number
JPS61255144A
JPS61255144A JP9641485A JP9641485A JPS61255144A JP S61255144 A JPS61255144 A JP S61255144A JP 9641485 A JP9641485 A JP 9641485A JP 9641485 A JP9641485 A JP 9641485A JP S61255144 A JPS61255144 A JP S61255144A
Authority
JP
Japan
Prior art keywords
circuit
line
signal
transmission line
termination circuit
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
Application number
JP9641485A
Other languages
Japanese (ja)
Inventor
Kazuo Nishikawa
西川　一夫
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP9641485A priority Critical patent/JPS61255144A/en
Publication of JPS61255144A publication Critical patent/JPS61255144A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To suppress the increase in the code of a node equipment and the increase in a circuit scale by connecting another line termination circuit between a line switch control circuit and a line termination circuit. CONSTITUTION:A node circuit 10 is provided with a transmission line termination circuit 1, a line switch control circuit 2, a line termination circuit 3 and a signal branching insertion circuit 4 and an external node circuit 15 is equipped with a line termination circuit 3' and a signal branch insertion circuit 4'. A transmission line signal on a loop transmission line 100 is subjected to signal processing such as equalization/amplification and discrimination/recovery by the circuit 1 and inputted to the signal branch insertion circuit 4 via the line switch control circuit 2, the line termination circuit 3', the signal branch insertion circuit 4' and the line termination circuit 3. Further, a desired signal is inserted in the transmission line signal by the signal branch insertion circuits 4, 4' and the result is sent to the loop transmission circuit 100 via the line switch control circuit 2 and the transmission line termination circuit 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はループ形ローカルエリアネットワーク（以下、
ＬＡＮという。）に結合されるノード装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a loop local area network (hereinafter referred to as
It's called LAN. ).

〔概要〕〔overview〕

本発明は、ディジタル信号が伝送されるループ状の伝送
路に結合され、この伝送路に対し信号を分岐挿入する回
線終端回路側の端末装置に接続されたノード装置におい
て、 端末装置に対し独立した回路手段を、増加した端末装置
に共用することにより、 コストの増大の割合に多数の端末装置を収容することが
できるようにしたものである。The present invention provides a node device that is coupled to a loop-shaped transmission path through which digital signals are transmitted and is connected to a terminal device on the side of a line termination circuit that adds and drops signals to this transmission path. By sharing the circuit means with the increased number of terminal devices, it is possible to accommodate a large number of terminal devices at a rate of increase in cost.

〔従来の技術〕[Conventional technology]

第２図に示すように、ＬＡＮに接続されるノード装置の
ノード回路２０１は、伝送路終端回路１と、回線切換制
御回路２と、回線終端回路３と、信号分岐挿入回路４と
を備える。ここで、伝送路終端回路１は伝送路信号の等
化・増幅、識別・再生、タイミング抽出および符号変換
の手段を有し、特に光伝送方式を用いた場合には、電気
光変換手段も含む。回線切換制御回路２は障害時のシス
テムダウンを防止するもので、伝送路信号のバイパスお
゛よびループバンク制御手段を有する。回線終端回路３
は伝送路信号のフレームの構成およびフレーム同期手段
を有する。信号分岐挿入回路４は複数の端末装置の入出
力信号を伝送路信号に対して分岐および挿入する手段を
有する。As shown in FIG. 2, a node circuit 201 of a node device connected to a LAN includes a transmission line termination circuit 1, a line switching control circuit 2, a line termination circuit 3, and a signal add/drop circuit 4. Here, the transmission line termination circuit 1 has means for equalizing/amplifying, identifying/regenerating, timing extraction, and code conversion of transmission line signals, and especially when using an optical transmission method, also includes an electro-optical conversion means. . The line switching control circuit 2 prevents the system from going down in the event of a failure, and has transmission line signal bypass and loop bank control means. Line termination circuit 3
has a frame structure of a transmission path signal and a frame synchronization means. The signal drop/add circuit 4 has means for dropping and inserting input/output signals of a plurality of terminal devices into a transmission line signal.

ところで、一つのノード回路２０１に収容できる端末装
置数には限度があり、同一フロアで限度以上の端末装置
を収容する必要がある場合には、従来例ノード装置１５
１では、第３図に示すように、もう一つのノード回路２
５を追加していた。By the way, there is a limit to the number of terminal devices that can be accommodated in one node circuit 201, and if it is necessary to accommodate more than the limit on the same floor, the conventional node device 15
1, as shown in FIG.
5 was added.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

このような従来例装置では、追加したノード回路２５の
伝送路終端回路１および回線切換制御回路２が必要にな
り、装置のコストの上昇を招く欠点があった。Such a conventional device requires the additional transmission line termination circuit 1 and line switching control circuit 2 of the node circuit 25, which has the disadvantage of increasing the cost of the device.

本発明は一つのノード回路に収容できる数取上の端末装
置を収容する場合に、コストを低減することができるノ
ード装置を提供することを目的とする。An object of the present invention is to provide a node device that can reduce costs when accommodating a large number of terminal devices that can be accommodated in one node circuit.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、ディジタル信号が伝送されるループ状の伝送
路に結合され、この伝送路の信号とノードで分岐挿入す
るための電気信号との相互変換を行う手段を含む伝送路
終端回路と、この伝送路終端回路に接続され上記電気信
号のバイパス接続および分岐挿入接続を切り換える回線
切換制御回路と、この回線切換制御回路の上記分岐挿入
接続側に接続され上記ディジタル信号のフレームの分解
および組立を行う回線終端回路とを備えたノード装置で
、前述の問題点を解決するための手段として、上記回線
切換制御回路と上記回線終端回路との間に別の回線終端
回路が接続されたことを特徴とする。The present invention relates to a transmission line termination circuit that is coupled to a loop-shaped transmission line through which digital signals are transmitted, and includes means for mutually converting signals on this transmission line and electrical signals to be added/dropped at nodes; a line switching control circuit that is connected to the transmission line termination circuit and switches between bypass connection and branch/add connection of the electric signal; and a line switching control circuit that is connected to the branch/add connection side of the line switching control circuit and disassembles and assembles the frame of the digital signal. A node device equipped with a line termination circuit, as a means for solving the above-mentioned problem, characterized in that another line termination circuit is connected between the line switching control circuit and the line termination circuit. do.

また、ディジタル信号が光信号であり、相互変換を行う
手段は光電気変換手段および電気光変換回路であっても
よい。Further, the digital signal may be an optical signal, and the means for mutual conversion may be an opto-electric conversion means and an electro-optic conversion circuit.

さらに、ディジタル信号が電気信号であり、相互変換を
行う手段は復調手段および変調手段であってもよい。Furthermore, the digital signal may be an electrical signal, and the means for mutual conversion may be demodulation means and modulation means.

〔作　用〕[For production]

回線終端回路は、これが収容できる端末装置数に限度が
あり、限度以上の端末装置を収容するときには増設する
必要がある。ところが、伝送路終端回路および回線切換
制御回路は、ノード装置が結合される伝送路にかかわる
回路で端末装置数に対し独立した回路構成であり、伝送
路終端回路では、伝送路上の信号に変換が施されて、回
線終端回路側の装置で処理できる形態の信号が生成され
、また回線切換制御回路では、回線終端回路側の装置の
障害時に伝送路上の信号の伝送経路が設定される。The line termination circuit has a limit on the number of terminal devices it can accommodate, and must be expanded to accommodate more terminal devices than the limit. However, the transmission line termination circuit and the line switching control circuit are circuits related to the transmission line to which node devices are connected, and have independent circuit configurations for the number of terminal devices. A signal is generated in a form that can be processed by the device on the line terminating circuit side, and the line switching control circuit sets a transmission route for the signal on the transmission path when the device on the line terminating circuit side fails.

〔実施例〕〔Example〕

本発明実施例回路を図に基づいて説明する。第１図は本
発明実施例装置の構成を示すブロック構成図である。A circuit according to an embodiment of the present invention will be explained based on the drawings. FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention.

まずＪこの実施例装置の構成を第１図に基づいて説明す
る。First, the configuration of the apparatus of this embodiment will be explained based on FIG.

ノード回路１０は伝送路終端回路１と、回線切換制御回
路２と、回線終端回路３と、信号分岐挿入回路４．とを
備え、また、外部ノード回路１５は回線路回路３′と信
号分岐挿入回路４′とを備える。The node circuit 10 includes a transmission line termination circuit 1, a line switching control circuit 2, a line termination circuit 3, a signal add/drop circuit 4. Further, the external node circuit 15 includes a line line circuit 3' and a signal add/drop circuit 4'.

回線切換制御回路２と回線終端回路３とは外部ノード回
路１５を経由して接続される。端末装置はノード回路１
０および外部ノード回路１５に収容される。The line switching control circuit 2 and the line termination circuit 3 are connected via an external node circuit 15. The terminal device is node circuit 1
0 and external node circuit 15.

次に、この実施例装置の動作を第１図に基づいて説明す
る。Next, the operation of this embodiment device will be explained based on FIG.

ループ伝送路１００上の伝送路信号は伝送路終端回路１
で等化・増幅および識別・再生などの信号処理が行われ
、回線切換制御回路２、回線終端回路３′、信号分岐挿
入回路４′および回線終端回路３を経由して信号分岐挿
入回路４に入力する。The transmission line signal on the loop transmission line 100 is transmitted to the transmission line termination circuit 1.
Signal processing such as equalization, amplification, identification, and reproduction is performed at input.

この伝送路信号から所望の信号が信号分岐挿入回路４お
よび４′に接続された端末装置に抽出される。また、信
号分岐挿入回路４および４′で、伝送路信号に所望の信
号が挿入され、回線切換制御回路２および伝送路終端回
路１を経由してループ・伝送路１００に送出される。A desired signal is extracted from this transmission line signal to a terminal device connected to the signal drop/add circuits 4 and 4'. In addition, a desired signal is inserted into the transmission line signal by the signal branch/add circuits 4 and 4', and sent to the loop/transmission line 100 via the line switching control circuit 2 and the transmission line termination circuit 1.

ここで、伝送路終端回路１では、ループ伝送路１００上
の信号が光信号であるときは、光電気変換手段および電
気光変換手段を有し、また、ループ伝送路１００上の信
号が電気信号であるときは、復調手段および変調手段を
有する。また、回線切換制御回路２は、回線終端回路３
を含めてその端末側装置をループ伝送路１００から開離
するときに、伝送路信号のバイパスおよびループバンク
制御を行う手段を含む。Here, in the transmission line termination circuit 1, when the signal on the loop transmission line 100 is an optical signal, it has an opto-electric conversion means and an electro-optic conversion means, and when the signal on the loop transmission line 100 is an electric signal. When it is, it has demodulation means and modulation means. The line switching control circuit 2 also includes a line termination circuit 3.
When disconnecting the terminal side device including the loop transmission line 100 from the loop transmission line 100, it includes means for bypassing the transmission line signal and controlling the loop bank.

〔発明の効果〕〔Effect of the invention〕

本発明は以上説明したように、ノード装置に収容する端
末装置数の増設時に独立して利用できるノード回路を増
設する代わりに、共通に利用できる手段を含まないノー
ド回路を増設するので、ノード装置のコストの増加およ
び回路規模の増大を抑制することができる効果がある。As explained above, the present invention, when increasing the number of terminal devices accommodated in a node device, instead of adding node circuits that can be used independently, adds a node circuit that does not include means that can be used in common. This has the effect of suppressing increases in cost and circuit scale.

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

第１図は本発明実施例装置の構成を示すブロック構成図
。 第２図は第一従来例装置の構成を示すブロック構成図。 第３図は第二従来例装置の構成を示すブロック構成図。 １・・・伝送路終端回路、２・・・回線切換制御回路、
３．３′・・・回線終端回路、４．４′・・・信号分岐
挿入回路、１０．２０．２５・・・ノード回路、１５・
・・外部ノード回路、１００・・・ループ伝送路、１０
１〜１０４．１５１〜１５４．２０１〜２０４　・・・
ノード装置。 特許出願人　日本電気株式会社　− 代理人　　弁理士　井　出　直　孝 実施例の構成図 第１図 箪−従来例の構成図 第　　　２　　　図FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a block configuration diagram showing the configuration of the first conventional device. FIG. 3 is a block configuration diagram showing the configuration of a second conventional device. 1... Transmission line termination circuit, 2... Line switching control circuit,
3.3'... Line termination circuit, 4.4'... Signal add/drop circuit, 10.20.25... Node circuit, 15.
...External node circuit, 100...Loop transmission line, 10
1~104.151~154.201~204...
Node equipment. Patent Applicant: NEC Corporation - Agent: Patent Attorney Nao Takashi IdeConstruction diagram of the embodiment Fig. 1 - Composition diagram of the conventional example Fig. 2

Claims (3)

【特許請求の範囲】[Claims] （１）ディジタル信号が伝送されるループ状の伝送路に
結合され、この伝送路の信号とノードで分岐挿入するた
めの電気信号との相互変換を行う手段を含む伝送路終端
回路と、 この伝送路終端回路に接続され上記電気信号のバイパス
接続および分岐挿入接続を切り換える回線切換制御回路
と、 この回線切換制御回路の上記分岐挿入接続側に接続され
上記ディジタル信号のフレームの分解および組立を行う
回線終端回路と を備えたノード装置において、 上記回線切換制御回路と上記回線終端回路との間に別の
回線終端回路が接続されたことを特徴とするノード装置
。(1) A transmission line termination circuit that is coupled to a loop-shaped transmission line through which digital signals are transmitted and includes means for mutually converting the signals of this transmission line and electrical signals to be added/dropped at nodes; a line switching control circuit that is connected to the line termination circuit and switches between a bypass connection and a branch/add connection of the electrical signal; and a line that is connected to the branch/insert connection side of the line switching control circuit and disassembles and assembles the frame of the digital signal. What is claimed is: 1. A node device comprising a termination circuit, further comprising another line termination circuit connected between the line switching control circuit and the line termination circuit. （２）ディジタル信号が光信号であり、相互変換を行う
手段は光電気変換手段および電気光変換手段である特許
請求の範囲第（１）項に記載のノード装置。(2) The node device according to claim (1), wherein the digital signal is an optical signal, and the means for mutual conversion is an opto-electric conversion means and an electro-optic conversion means. （３）ディジタル信号が電気信号であり、相互変換を行
う手段は復調手段および変調手段である特許請求の範囲
第（１）項に記載のノード装置。(3) The node device according to claim (1), wherein the digital signal is an electrical signal, and the means for mutual conversion is demodulation means and modulation means.
JP9641485A 1985-05-07 1985-05-07 Node equipment Pending JPS61255144A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9641485A JPS61255144A (en) 1985-05-07 1985-05-07 Node equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9641485A JPS61255144A (en) 1985-05-07 1985-05-07 Node equipment

Publications (1)

Publication Number Publication Date
JPS61255144A true JPS61255144A (en) 1986-11-12

Family

ID=14164309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9641485A Pending JPS61255144A (en) 1985-05-07 1985-05-07 Node equipment

Country Status (1)

Country Link
JP (1) JPS61255144A (en)

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