JPH05300101A - Method for transmission via repeater stations - Google Patents

Method for transmission via repeater stations

Info

Publication number
JPH05300101A
JPH05300101A JP4103298A JP10329892A JPH05300101A JP H05300101 A JPH05300101 A JP H05300101A JP 4103298 A JP4103298 A JP 4103298A JP 10329892 A JP10329892 A JP 10329892A JP H05300101 A JPH05300101 A JP H05300101A
Authority
JP
Japan
Prior art keywords
repeater stations
signals
signal
transmitted
transmission method
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
JP4103298A
Other languages
Japanese (ja)
Other versions
JP2771071B2 (en
Inventor
Akira Arai
曉 新居
Itaru Kotani
至 小谷
Makoto Ota
誠 大田
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.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen 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 Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP4103298A priority Critical patent/JP2771071B2/en
Publication of JPH05300101A publication Critical patent/JPH05300101A/en
Application granted granted Critical
Publication of JP2771071B2 publication Critical patent/JP2771071B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To provide the method for transmission via repeater stations which can connect a lot of repeater stations. CONSTITUTION:This transmission method is provided for transmitting data via plural repeater stations 1', 2' and 3' connected by optical fiber cables 10, 11, 12 and 13, and modulated signals modulating data by an NRZ 1 transmission system are transmitted while inverting the polarity of signals by inverters 14, 15 and 16 at the respective repeater stations 1', 2' and 3'. Since the polarity of signals is inverted by the inverters 14, 15 and 16 even when rise and fall charactersitics are different for OE converters 4, 5 and 6 at the repeater stations 1', 2' and 3', the time is canceled, and the signals reduced the distortion can be transmitted through a lot of repeater stations. On the other hand, since the NRZ 1 transmission system is used, the data can be transmitted without making the meaning of the transmitted data different even when the signals are inverted. Further, elements for inverting signals can be constituted at low cost, and a network can be constituted at low cost without using any complicated circuits.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、光ファイバー・ケーブ
ルで接続された複数の中継局を経由してデータを伝送す
る伝送方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission method for transmitting data via a plurality of relay stations connected by optical fiber cables.

【0002】[0002]

【従来の技術】上記中継局を経由する伝送方法は、ノー
ドをリング状に接続したリング状LAN(Local Area N
etwork) などに使用されている。
2. Description of the Related Art A transmission method via a relay station is a ring LAN (Local Area N) in which nodes are connected in a ring.
etwork) etc.

【0003】従来の上記中継局を経由する伝送方法を、
図4に基づいて説明する。各LANの中継局1,2,3
はそれぞれ、光信号/電気信号−変換器(以下、OE変
換器と略す)4,5,6と、このOE変換器4,5,6
に接続された端末のコンピュータ(ノード)7,8,9
から構成され、各中継局1,2,3のOE変換器4,
5,6は、光ファイバー・ケーブル10,11,12,13によ
り接続されている。このOE変換器4,5,6は、入力
した光信号を電気信号に変換して、接続されたコンピュ
ータ7,8,9へ出力し、さらに変換した電気信号を光
信号へ変換して光ファイバー・ケーブル11,12,13を介
して接続されたOE変換器5,6へ出力している。
A conventional transmission method via the relay station is
It will be described with reference to FIG. Relay stations 1, 2, 3 for each LAN
Are optical signal / electrical signal-converters (hereinafter abbreviated as OE converters) 4, 5 and 6, and OE converters 4, 5 and 6 respectively.
Computers (nodes) 7, 8 and 9 connected to the terminal
And the OE converter 4 of each relay station 1, 2, 3
5, 5 are connected by optical fiber cables 10, 11, 12, 13. The OE converters 4, 5 and 6 convert the input optical signal into an electric signal and output the electric signal to the connected computers 7, 8 and 9, and further convert the converted electric signal into an optical signal to convert it to an optical fiber. It outputs to the OE converters 5 and 6 connected via the cables 11, 12, and 13.

【0004】[0004]

【発明が解決しようとする課題】しかし、上記伝送方法
では、OE変換器4,5,6の動作特性(立ち上がり、
立ち下がり特性)により、その伝送波形が歪み、多くの
中継局、すなわち多くのワークステーションを増設する
ことが困難であるという問題があった。
However, in the above transmission method, the operating characteristics of the OE converters 4, 5 and 6 (startup,
There is a problem that the transmission waveform is distorted due to the fall characteristic) and it is difficult to add many relay stations, that is, many workstations.

【0005】たとえば、図5に示すように、OE変換器
5,6において、信号レベルがH(ハイレベル)からL
(ローレベル)へ変化する時間(図5においては2T)
と、LからHへ変化する時間(図5においては3T)が
異なると、OE変換器4の出力信号xとOE変換器6の
出力信号zではその信号長X,Zには時間2Tの差が生
じる。このように、中継局が多くなると、信号長の差が
次第に長くなり、誤った信号が伝送されてしまうため、
中継局の数が制限されていた。
For example, as shown in FIG. 5, in the OE converters 5 and 6, the signal level changes from H (high level) to L.
Time to change to (low level) (2T in Fig. 5)
And the time for changing from L to H (3T in FIG. 5) is different, the difference between the signal lengths X and Z of the output signal x of the OE converter 4 and the output signal z of the OE converter 6 is 2T. Occurs. In this way, as the number of relay stations increases, the difference in signal length gradually increases, and erroneous signals are transmitted.
The number of relay stations was limited.

【0006】よって中継局を増すためには、複雑な周波
数変調回路や位相変調回路などを必要とし、また伝送方
法によっては、特性の優れた光ファイバー・ケーブルや
変換素子を使用しなければならず、高価なネットワーク
にならざるを得ないという問題があった。
Therefore, in order to increase the number of relay stations, complicated frequency modulation circuits and phase modulation circuits are required, and depending on the transmission method, it is necessary to use optical fiber cables and conversion elements having excellent characteristics, There was a problem that it had to be an expensive network.

【0007】本発明は上記問題を解決するものであり、
複雑な回路を必要とせずに、安価に多くの中継局を接続
可能な伝送方法を提供することを目的とするものであ
る。
The present invention solves the above problems,
It is an object of the present invention to provide a transmission method capable of connecting many relay stations at low cost without requiring a complicated circuit.

【0008】[0008]

【課題を解決するための手段】上記問題を解決するため
本発明の中継局を経由する伝送方法は、光ファイバー・
ケーブルで接続された複数の中継局を経由してデータを
伝送する伝送方法であって、データをNRZ1伝送方式
で変調して前記光ファイバー・ケーブルを介して伝送
し、前記各中継局ではそれぞれ入力信号の極性を反転し
て出力することを特徴とするものである。
In order to solve the above problems, a transmission method via a relay station according to the present invention is
A transmission method for transmitting data via a plurality of relay stations connected by a cable, wherein data is modulated by an NRZ1 transmission method and transmitted through the optical fiber cable, and each relay station receives an input signal. It is characterized by inverting the polarity of and outputting.

【0009】[0009]

【作用】上記構成により、各中継局において入力信号が
反転されることにより、中継局の変換素子の立ち上がり
特性と、立ち下がり特性に違いがあっても、その時間が
相殺され、歪みの少ない信号が伝送される。またNRZ
1伝送方式を使用することによって、信号が反転しても
伝送データの意味が異なることなく、伝送される。
With the above configuration, the input signal is inverted at each relay station, so that even if there is a difference between the rising characteristic and the falling characteristic of the conversion element of the relay station, the time is canceled and the signal with less distortion is generated. Is transmitted. NRZ
By using the 1-transmission method, even if the signal is inverted, the meaning of the transmission data does not change and the data is transmitted.

【0010】[0010]

【実施例】以下、本発明の一実施例を図面に基づいて説
明する。なお、従来例の図4と同一の構成には同一の符
号を付して説明を省略する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same configurations as those of the conventional example shown in FIG.

【0011】図1は本発明の中継局を経由する伝送方法
を使用したLANの構成図であり、各中継局1',2',3'
に、各OE変換器4,5,6の出力信号を反転するイン
バータ14,15,16を付設している。
FIG. 1 is a block diagram of a LAN using a transmission method via a relay station according to the present invention. Each relay station 1 ', 2', 3 '
In addition, inverters 14, 15, 16 for inverting the output signals of the OE converters 4, 5, 6 are additionally provided.

【0012】またデータの伝送方式に、NRZ1(Non
Return to Zero Change on 1) を使用している。この伝
送方式によると、図3に示すように、入力データが0と
なる毎に信号は反転して出力される。
In addition, as a data transmission method, NRZ1 (Non
I am using Return to Zero Change on 1). According to this transmission method, as shown in FIG. 3, the signal is inverted and output every time the input data becomes 0.

【0013】上記構成による動作を図2の信号波形図に
基づいて説明する。。OE変換器4の出力信号aはイン
バータ14により反転され、このインバータ14の出力信号
bはOE変換器5に入力され、このOE変換器5より、
時間3T遅れて立ち上がり、時間2T遅れて立ち下がっ
て伝送される。OE変換器5の出力信号cはインバータ
15により反転され、このインバータ15の出力信号dはO
E変換器6に入力され、このOE変換器6により、時間
2T遅れて立ち下がり、時間3T遅れて立ち上がって伝
送される。OE変換器6の出力信号eはインバータ16に
より反転され、その出力信号fが伝送される。
The operation of the above configuration will be described with reference to the signal waveform diagram of FIG. .. The output signal a of the OE converter 4 is inverted by the inverter 14, the output signal b of the inverter 14 is input to the OE converter 5, and the OE converter 5 outputs
The signal is transmitted with a time delay of 3T and a time delay of 2T. The output signal c of the OE converter 5 is an inverter
Inverted by 15, the output signal d of this inverter 15 is O
The signal is input to the E converter 6, and the OE converter 6 causes the signal to fall with a time delay of 2T and rise with a time delay of 3T for transmission. The output signal e of the OE converter 6 is inverted by the inverter 16 and the output signal f thereof is transmitted.

【0014】この信号波形から判るように、OE変換器
5とOE変換器6の立ち上がり時間と立ち下り時間が互
いに相殺され、OE変換器4の出力信号aの信号長Aと
インバータ16の出力信号fの信号長Fは同一となり、よ
って歪みのない信号を伝送することができる。
As can be seen from this signal waveform, the rising time and the falling time of the OE converter 5 and the OE converter 6 cancel each other, and the signal length A of the output signal a of the OE converter 4 and the output signal of the inverter 16 are canceled. Since the signal length F of f is the same, it is possible to transmit a signal without distortion.

【0015】また、NRZ1方式を使用することによ
り、信号が反転しても、伝送データの意味を変化せずに
データを伝送することができる。このように、複雑な回
路や特性の優れた光ファイバー・ケーブルや変換素子を
使用することなく、歪みの少ない信号を数多くの中継局
1',2',3'を介して伝送することができ、かつ安価にネ
ットワークを構成することができる。
Further, by using the NRZ1 system, even if the signal is inverted, the data can be transmitted without changing the meaning of the transmission data. In this way, it is possible to transmit signals with low distortion to a large number of relay stations without using complicated circuits or optical fiber cables or conversion elements with excellent characteristics.
It is possible to transmit via 1 ', 2', 3 ', and a network can be constructed at low cost.

【0016】[0016]

【発明の効果】以上述べたように本発明によれば、各中
継局において信号が反転されることにより、中継局の変
換素子の立ち上がり特性と、立ち下がり特性に違いがあ
っても、その時間が相殺され、歪みの少ない信号を数多
くの中継局を介して伝送でき、またNRZ1伝送方式を
使用することにより、信号が反転しても伝送データの意
味が異なることなく、伝送できる。さらに、信号を反転
するための素子は、安価に構成でき、従来のように複雑
な回路や特性の優れた光ファイバー・ケーブルや変換素
子を使用する必要がなくなり、安価にネットワークを構
成することができる。
As described above, according to the present invention, even if there is a difference between the rising characteristic and the falling characteristic of the conversion element of the relay station due to the signal being inverted at each relay station, the time , And a signal with less distortion can be transmitted through a large number of relay stations, and by using the NRZ1 transmission method, even if the signal is inverted, the meaning of the transmission data can be transmitted without any difference. Further, the element for inverting the signal can be configured at low cost, and it is not necessary to use a complicated circuit or an optical fiber cable or a conversion element having excellent characteristics as in the past, and the network can be configured at low cost. ..

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

【図1】本発明の中継局を経由する伝送方法を使用した
LANの一部構成図である。
FIG. 1 is a partial configuration diagram of a LAN using a transmission method via a relay station of the present invention.

【図2】図1の要部信号波形図である。FIG. 2 is a signal waveform diagram of a main part of FIG.

【図3】本発明の中継局を経由する伝送方法に使用する
NRZ1伝送方式の変調波形図である。
FIG. 3 is a modulation waveform diagram of the NRZ1 transmission system used in the transmission method via the relay station of the present invention.

【図4】従来の中継局を経由する伝送方法を使用したL
ANの一部構成図である。
FIG. 4 is an L using a transmission method via a conventional relay station.
It is a partial block diagram of AN.

【図5】図4の要部信号波形図である。5 is a signal waveform diagram of a main part of FIG.

【符号の説明】[Explanation of symbols]

1',2',3' 中継局 4,5,6 OE変換器 7,8,9 コンピュータ 10,11,12,13 光ファイバー・ケーブル 14,15,16 インバータ 1 ', 2', 3'Relay station 4, 5, 6 OE converter 7, 8, 9 Computer 10, 11, 12, 13 Optical fiber cable 14, 15, 16 Inverter

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 光ファイバー・ケーブルで接続された複
数の中継局を経由してデータを伝送する伝送方法であっ
て、 データをNRZ1伝送方式で変調して前記光ファイバー
・ケーブルを介して伝送し、前記各中継局ではそれぞれ
入力信号の極性を反転して出力することを特徴とする中
継局を経由する伝送方法。
1. A transmission method for transmitting data via a plurality of relay stations connected by an optical fiber cable, wherein the data is modulated by an NRZ1 transmission method and transmitted via the optical fiber cable, A transmission method via a relay station, in which the polarity of the input signal is inverted and output at each relay station.
JP4103298A 1992-04-23 1992-04-23 Transmission method via relay station Expired - Fee Related JP2771071B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4103298A JP2771071B2 (en) 1992-04-23 1992-04-23 Transmission method via relay station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4103298A JP2771071B2 (en) 1992-04-23 1992-04-23 Transmission method via relay station

Publications (2)

Publication Number Publication Date
JPH05300101A true JPH05300101A (en) 1993-11-12
JP2771071B2 JP2771071B2 (en) 1998-07-02

Family

ID=14350359

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4103298A Expired - Fee Related JP2771071B2 (en) 1992-04-23 1992-04-23 Transmission method via relay station

Country Status (1)

Country Link
JP (1) JP2771071B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100367814B1 (en) * 1996-11-18 2003-01-14 텔레폰악티에볼라겟엘엠에릭슨(펍) Method and device for signal repetition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6416135A (en) * 1987-07-10 1989-01-19 Nippon Telegraph & Telephone Optical relay transmission system
JPH03205938A (en) * 1989-10-06 1991-09-09 Fujitsu Ltd Optical signal repeating transmission control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6416135A (en) * 1987-07-10 1989-01-19 Nippon Telegraph & Telephone Optical relay transmission system
JPH03205938A (en) * 1989-10-06 1991-09-09 Fujitsu Ltd Optical signal repeating transmission control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100367814B1 (en) * 1996-11-18 2003-01-14 텔레폰악티에볼라겟엘엠에릭슨(펍) Method and device for signal repetition

Also Published As

Publication number Publication date
JP2771071B2 (en) 1998-07-02

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