JPH0152946B2 - - Google Patents
Info
- Publication number
- JPH0152946B2 JPH0152946B2 JP58220964A JP22096483A JPH0152946B2 JP H0152946 B2 JPH0152946 B2 JP H0152946B2 JP 58220964 A JP58220964 A JP 58220964A JP 22096483 A JP22096483 A JP 22096483A JP H0152946 B2 JPH0152946 B2 JP H0152946B2
- Authority
- JP
- Japan
- Prior art keywords
- master station
- local area
- clock pulse
- transmission line
- lan
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 25
- 239000000284 extract Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 15
- 101100048435 Caenorhabditis elegans unc-18 gene Proteins 0.000 description 13
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/422—Synchronisation for ring networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Description
【発明の詳細な説明】
本発明はループ伝送路上に一つのマスタ局およ
び複数のリモート局を接続し、端末装置の信号を
同期多重して伝送するループ形ローカルエリアネ
ツトワーク（以下LANと称す）間の同期化に関
する。[Detailed Description of the Invention] The present invention is a loop-type local area network (hereinafter referred to as LAN) that connects one master station and a plurality of remote stations on a loop transmission path, and transmits terminal equipment signals by synchronously multiplexing them. Regarding synchronization between
異なるLANに接続された端末装置間で信号の
授受を行なうにはLAN間の同期化が必要である。
LAN間の同期化で従来考えられている方式の構
成例を第１図に示す。同図に示すLANではクロ
ツクパルス供給装置（DCS）４からクロツクパ
ルス供給線５を通してLAN１及びLAN２のマス
タ局（MS）３にクロツクパルスが供給される。
マスタ局３は供給されたクロツクパルスを基本ク
ロツク成分とするデータ信号（各リモート局
（RS）で処理されるデータ）を発生して伝送路１
１へ送出する。伝送路１１に夫々接続されている
リモート局（RS）２は伝送路１１に伝送されて
いるデータ信号から基本クロツク成分を抽出して
クロツクパルスを形成し、これに同期して入力デ
ータ信号を処理する。また入力データ信号はその
まま次のリモート局へ送出するしかし、クロツク
パルス供給線５の許容線長は高々数10mである
が、LAN１とLAN２が空間的に離れており、ク
ロツクパルス供給装置４とLAN１又はLAN２の
マスタ局（MS）３との距離が上記許容線長以上
である場合、LAN間の同期化は困難である
本発明の目的は空間的に離れた二つのLAN間
の同期化を可能とするローカルエリアネツトワー
ク間同期方式を提供することにある。 In order to send and receive signals between terminal devices connected to different LANs, synchronization between the LANs is required.
Figure 1 shows an example of the configuration of a conventional method for synchronizing LANs. In the LAN shown in the figure, clock pulses are supplied from a clock pulse supply device (DCS) 4 to a master station (MS) 3 of LAN1 and LAN2 through a clock pulse supply line 5.
The master station 3 generates a data signal (data to be processed by each remote station (RS)) using the supplied clock pulse as a basic clock component, and sends it to the transmission line 1.
Send to 1. Each remote station (RS) 2 connected to the transmission line 11 extracts a basic clock component from the data signal transmitted on the transmission line 11 to form a clock pulse, and processes the input data signal in synchronization with this clock pulse. . In addition, the input data signal is sent as is to the next remote station.However, although the allowable line length of the clock pulse supply line 5 is several tens of meters at most, LAN1 and LAN2 are spatially separated, and the clock pulse supply device 4 and LAN1 or LAN2 If the distance from the master station (MS) 3 is longer than the above-mentioned allowable line length, synchronization between LANs is difficult.An object of the present invention is to enable synchronization between two spatially separated LANs. The purpose of this invention is to provide a synchronization method between local area networks.
本発明によれば、マスタ局と、このマスタ局が
送出するデータ信号に同期する複数のリモート局
とがループ伝送路を介してループ状に接続された
第１、第２のローカルエリアネツトワーク
（LAN）において、前記第１のLANのループ伝
送路に接続され、そこを流れる前記データ信号の
基本クロツク成分を抽出してクロツクパルスを発
生するクロツクパルス再生手段を含み、前記クロ
ツクパルス再生手段は前記第２のLANのマスタ
局にそのクロツクパルスを供給して前記第１及び
第２のLAN間のビツト同期をとることを特徴と
するローカルエリアネツトワーク間同期方式が得
られる。 According to the present invention, a master station and a plurality of remote stations synchronized with a data signal transmitted by the master station are connected in a loop through a loop transmission path to first and second local area networks ( LAN), the clock pulse regeneration means is connected to the loop transmission line of the first LAN and extracts a basic clock component of the data signal flowing therethrough to generate a clock pulse, and the clock pulse regeneration means is connected to the loop transmission line of the second LAN. A synchronization system between local area networks is obtained, which is characterized in that bit synchronization between the first and second LANs is achieved by supplying the clock pulse to the master station of the LAN.
したがつて本発明は、クロツクパルス再生手段
が第１のLANの一部となるので、第１のLANの
マスタ局およびリモート局と、第２のLANのマ
スタ局およびリモート局とが互いに離れていて
も、第１のLANのクロツク再生手段が第２の
LANのマスタ局に比較的近い位置にあれば、こ
のLAN間の同期化に支障をきたすことはない。 Therefore, in the present invention, since the clock pulse regeneration means becomes a part of the first LAN, the master station and remote station of the first LAN and the master station and remote station of the second LAN are separated from each other. Also, the first LAN clock regeneration means is
If it is located relatively close to the LAN master station, there will be no problem with synchronization between LANs.
次に本発明の実施例を図面を参照して説明す
る。 Next, embodiments of the present invention will be described with reference to the drawings.
第２図は本発明による一実施例を示すブロツク
図である。図において、LAN１およびLAN２
は、光ローカルエリアネツトワークを示す。
LAN１では、複数のリモート局（RS）２が伝送
路１１に縦接続され、さらにマスタ局（MS）３
ａおよび光中継装置６が伝送路１１′を介して接
続され一方向伝送ループを構成している。また
LAN２では、一方の伝送路１２に、複数のリモ
ート局（RS）２とマスタ局（MS）３ｂとがルー
プ状に接続されている。光中継装置６は、伝送路
５′を介してLAN２のマスタ局３ｂの近くに接続
されている。伝送路１１，１１′，１２および
５′は光フアイバケーブルである。LAN１のマス
タ局３ａは、このマスタ局に固有の基本クロツク
に同期した各リモート局（RS）２で処理される
べき光データを発生し、伝送路１１′へ送出する。
リモート局２は、伝送路１１を伝送している光デ
ータを入力してその基本クロツク成分を抽出し、
さらに入力光データから必要なデータを取出し
て、そのデータの処理を基本クロツクに同期して
行う。一方、入力光データは次に接続されている
リモート局へも送出される。したがつてLAN１
では、マスタ局３ａが発生する光データに含有さ
れる基本クロツクに同期して各リモート局２が動
作する。中継装置６は、中継回路６ａとクロツク
パルス再生回路６ｂから構成されている。中継回
路６ａはマスタ局３ａから送出された光データを
分岐して伝送路１１およびクロツクパルス再生回
路６ｂへ送出する。クロツクパルス再生回路６ｂ
は光データから基本クロツク成分を抽出してクロ
ツクパルスを発生し、このクロツクパルスを
LAN２のマスタ局（MS）３ｂへ送出する。 FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, LAN1 and LAN2
indicates an optical local area network.
In LAN 1, multiple remote stations (RS) 2 are vertically connected to transmission line 11, and master station (MS) 3 is connected vertically to transmission line 11.
a and the optical repeater 6 are connected via a transmission path 11' to form a one-way transmission loop. Also
In the LAN 2, a plurality of remote stations (RS) 2 and a master station (MS) 3b are connected to one transmission path 12 in a loop. The optical repeater 6 is connected near the master station 3b of the LAN 2 via a transmission path 5'. Transmission lines 11, 11', 12 and 5' are optical fiber cables. The master station 3a of the LAN 1 generates optical data to be processed by each remote station (RS) 2 synchronized with a basic clock specific to the master station, and sends it to the transmission line 11'.
The remote station 2 inputs the optical data transmitted through the transmission line 11 and extracts its basic clock component.
Furthermore, necessary data is extracted from the input optical data and the data is processed in synchronization with the basic clock. On the other hand, the input optical data is also sent to the next connected remote station. Therefore LAN1
Then, each remote station 2 operates in synchronization with the basic clock contained in the optical data generated by the master station 3a. The relay device 6 is composed of a relay circuit 6a and a clock pulse regeneration circuit 6b. The relay circuit 6a branches the optical data sent from the master station 3a and sends it to the transmission line 11 and the clock pulse regeneration circuit 6b. Clock pulse regeneration circuit 6b
extracts the basic clock component from optical data, generates a clock pulse, and converts this clock pulse into
Send to master station (MS) 3b of LAN2.
LAN２のマスタ局３ｂは、受信したクロツク
パルスを伝送路１２へ送出すると共にLAN１と
同様に各リモート局で処理されるべきデータを発
生する。したがつてLAN２のマスタ局３ｂに送
られた光中継装置６からのクロツクパルスは、
LAN２の伝送路マスタクロツクとして使用され
る。 The master station 3b of LAN2 sends out the received clock pulses to the transmission line 12, and also generates data to be processed by each remote station in the same way as in LAN1. Therefore, the clock pulse from the optical repeater 6 sent to the master station 3b of the LAN 2 is
Used as the transmission line master clock for LAN2.
本実施例によれば、二つのLAN（LAN１及び
LAN２）が空間的に離れていても、光中継装置
６をLAN２のマスタ局３ｂの比較的近くに配置
し、LAN１のループ伝送路に接続することによ
り、LAN１及びLAN２の同期化が可能である。 According to this embodiment, two LANs (LAN1 and
Even if LAN2) are spatially separated, LAN1 and LAN2 can be synchronized by placing the optical repeater 6 relatively close to the master station 3b of LAN2 and connecting it to the loop transmission line of LAN1. .
なお、上記実施例では、光信号を扱う光ローカ
ルエリアネツトワークについて述べたが、電気信
号を扱うローカルエリアネツトワークでもよい。
この場合、伝送路は同軸ケーブルを使用する。 In the above embodiment, an optical local area network that handles optical signals has been described, but a local area network that handles electrical signals may also be used.
In this case, a coaxial cable is used as the transmission line.
第１図は従来のLAN間同期方式のブロツク図、
第２図は本発明の一実施例を示すブロツク図であ
る。
１１，１１′，１２，１２′……伝送路、５，
５′……クロツクパルス供給線、３，３ａ，３ｂ
……マスタ局、２……LANリモート局、４……
クロツクパルス供給装置、６……光中継装置。
Figure 1 is a block diagram of the conventional LAN synchronization method.
FIG. 2 is a block diagram showing one embodiment of the present invention. 11, 11', 12, 12'...transmission line, 5,
5'...Clock pulse supply line, 3, 3a, 3b
...Master station, 2...LAN remote station, 4...
Clock pulse supply device, 6...optical relay device.
Claims (1)
信号に同期する複数のリモート局とがループ伝送
路に接続された第１、第２のローカルエリアネツ
トワークの同期方式において、前記第１のローカ
ルエリアネツトワークのループ伝送路に接続さ
れ、その伝送路を流れるデータ信号からの基本ク
ロツク成分を抽出してクロツクパルスを発生する
クロツクパルス再生手段を含み、前記第２のロー
カルエリアネツトワークのマスタ局に前記クロツ
クパルスを供給して前記第１及び第２のローカル
エリアネツトワーク間のビツト同期をとることを
特徴とするローカルエリアネツトワーク間同期方
式。1 In a synchronization method of first and second local area networks in which a master station and a plurality of remote stations synchronized with a data signal transmitted by the master station are connected to a loop transmission path, the first local area The network includes a clock pulse regenerating means connected to a loop transmission line of the network, which extracts a basic clock component from a data signal flowing through the transmission line and generates a clock pulse, and transmits the clock pulse to the master station of the second local area network. A method for synchronizing between local area networks, characterized in that bit synchronization is achieved between the first and second local area networks by supplying the first and second local area networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58220964A JPS60113551A (en) | 1983-11-24 | 1983-11-24 | Synchronizing system between local area networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58220964A JPS60113551A (en) | 1983-11-24 | 1983-11-24 | Synchronizing system between local area networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60113551A JPS60113551A (en) | 1985-06-20 |
| JPH0152946B2 true JPH0152946B2 (en) | 1989-11-10 |
Family
ID=16759311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58220964A Granted JPS60113551A (en) | 1983-11-24 | 1983-11-24 | Synchronizing system between local area networks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60113551A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63102524A (en) * | 1986-10-20 | 1988-05-07 | Fujitsu Ltd | Duplicated connection method for master clock source |
-
1983
- 1983-11-24 JP JP58220964A patent/JPS60113551A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60113551A (en) | 1985-06-20 |
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