JPS5940741A - Local network access system - Google Patents

Local network access system

Info

Publication number
JPS5940741A
JPS5940741A JP15084182A JP15084182A JPS5940741A JP S5940741 A JPS5940741 A JP S5940741A JP 15084182 A JP15084182 A JP 15084182A JP 15084182 A JP15084182 A JP 15084182A JP S5940741 A JPS5940741 A JP S5940741A
Authority
JP
Japan
Prior art keywords
data terminal
transmission path
local network
transmission line
access
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
JP15084182A
Other languages
Japanese (ja)
Other versions
JPH0120819B2 (en
Inventor
Masaji Shinya
新屋 正次
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
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15084182A priority Critical patent/JPS5940741A/en
Publication of JPS5940741A publication Critical patent/JPS5940741A/en
Publication of JPH0120819B2 publication Critical patent/JPH0120819B2/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]
    • H04L12/40Bus networks
    • H04L12/407Bus networks with decentralised control
    • H04L12/417Bus networks with decentralised control with deterministic access, e.g. token passing

Landscapes

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

Abstract

PURPOSE:To access equally each data terminal to a transmission line, by providing the right of use of an idle transmission line to the data terminal having a number older than the device number of the data terminal, when the use of transmission line is finished at the data terminal. CONSTITUTION:When >=2 adaptors (e.g., adaptors 2b and 2n) give an access request signal in an idle time band 200 just after data terminal 1a is finished to use a transmission line 3, since adaptors 2a, 2b-2n discriminate that the right of use of the transmission line 3 is to be given to data terminals 1b-1n having a number older than that of the data terminal 1a using the transmission line 3 before, if the adaptor 2b has the access request signal in the adaptor 2b in the timing of the idle time band 200-B, the accessing of the data terminal 1b is performed and the accessing of the data terminal 1n is performed in the timing of an idle time band 200-N after the use of transmission line.

Description

【発明の詳細な説明】 本発明はローカルネットワークアクセス方式に関し、特
にローカルネットワークシステムを構成する各種データ
端末が1つの伝送路にアクセスするローカルネットワー
クアクセス方式に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a local network access method, and more particularly to a local network access method in which various data terminals constituting a local network system access one transmission path.

オフィスや工場においてワードプロセッサ、ファクシミ
リ、複写装置等のデータ端末相互間の情報授受を1つの
伝送路を介して行ういわゆるローカルネットワークシス
テムの導入が最近推進されている。従来この種のローカ
ルネットワークシステムでは、該ネットワークに接続さ
れる複数のデータ端末に一連番号(以下装置番号)を与
えておき、伝送路を使用し終ったデータ端末が自装置番
号の次の装置番号を持つデータ端末に該伝送路の使用許
可を与え、このデータ端末が伝送路へのアクセス要求を
持たないとき(すなわち伝送路を使用しないとき)はさ
らにその次の装置番号を持つデータ端末に伝送路の使用
許可を与えるローカルネットワークアクセス方式が採ら
れて゛いる。従って2つ以上のデータ端末が′1つの伝
送路を同時に使用することはなく順次使用するようにな
っている。しかるにこの方式では、1つの伝送路へのア
クセス要求を有するデータ端末は伝送路使用許可が自装
置番号忙回ってくるまでアクセスすることができず、ア
クセス要求が発生してから該伝送路にアクセスするまで
の時間がかかり過ぎるという欠点があった。
2. Description of the Related Art Recently, the introduction of so-called local network systems in which information is exchanged between data terminals such as word processors, facsimile machines, and copying machines via a single transmission path has been promoted in offices and factories. Conventionally, in this type of local network system, serial numbers (hereinafter referred to as device numbers) are assigned to multiple data terminals connected to the network, and the data terminal that has finished using the transmission path assigns a device number next to its own device number. When this data terminal has no request for access to the transmission path (i.e., does not use the transmission path), the data terminal with the next device number is given permission to use the transmission path. A local network access method is adopted that grants permission to use the network. Therefore, two or more data terminals do not use one transmission line simultaneously, but use them sequentially. However, in this method, a data terminal that has an access request to one transmission path cannot access the transmission path until the permission to use the transmission path reaches its own device number, and it cannot access the transmission path after the access request occurs. The drawback was that it took too much time.

また別の方式として、アクセス要求を発生したデータ端
末はその要求発生時に伝送路が空きであれば直ちにアク
セスを行い、もし2つ以上のデータ端末が同時にアクセ
ス要求を発生したときは、これらデータ端末はアクセス
要求を一旦取り下げそれぞれのデータ端末で乱数により
発生した時間中 が経過してから再度アクセスするよ、うにして2つ以上
のデータ端末が1つの伝送路に同時にアクセスしないよ
うにする方式が採られている。しかるにこの方式では、
データ端末間に伝送路へのアクセス優先権は無く、言わ
ば早い者勝ちという問題点のほか、乱数発生により再度
アクセスを行うという複雑な制御を要する欠点があった
Another method is to use a data terminal that has generated an access request to access it immediately if the transmission path is free when the request is generated, and if two or more data terminals generate access requests at the same time, these data terminals There is a method to prevent two or more data terminals from accessing one transmission path at the same time by first canceling the access request and then accessing again after a period of time generated by a random number has elapsed for each data terminal. It is taken. However, with this method,
In addition to the problem that there is no priority right of access to the transmission path between data terminals, so to speak, first come, first served, there is also the drawback that it requires complicated control such as accessing again by random number generation.

本発明の目的は、あるデータ端末が伝送路を使用し終っ
たとき、該データ端末の装置番号よりも老番号を持つデ
ータ端末に空き伝送路の使用権を与えることにより上記
の欠点を除去し、2つ以上のデータ端末が伝送路に同時
にアクセスしないようにするとともに各データ端末がX
F等に伝送路にアクセスできるようにしたローカルネッ
トワークアクセス方式を提供することにある。
An object of the present invention is to eliminate the above-mentioned drawbacks by giving the right to use the vacant transmission path to a data terminal with an older device number than that of the data terminal when a certain data terminal finishes using the transmission path. , prevent two or more data terminals from accessing the transmission path at the same time, and ensure that each data terminal
The purpose of the present invention is to provide a local network access method that allows F, etc. to access a transmission path.

本発明によるローカルネットワークアクセス方式は、一
連の装置番号を付与した複数のデータ端末相互間の情報
授受を1つの伝送路を介して行うローカルネットワーク
システムにおいて、前記伝送路の空きを検出する検出手
段と、前記各データ端末から前記伝送路へアクセス要求
信号を送出する送出手段と、該アクセス要求信号を受信
して前回該伝送路を使用したデータ端末の装置番号より
も老番号を持つデータ端末に該伝送路の使用権を与える
付与手段を備えることを特徴とする。
The local network access method according to the present invention includes, in a local network system in which information is exchanged between a plurality of data terminals assigned a series of device numbers via one transmission path, a detection means for detecting an idle state of the transmission path; , sending means for sending an access request signal from each of the data terminals to the transmission path; and sending means that receives the access request signal and applies the access request signal to a data terminal having a device number older than the device number of the data terminal that last used the transmission path. It is characterized by comprising a granting means for granting the right to use the transmission path.

次に図面を参照して本発明について説明する。Next, the present invention will be explained with reference to the drawings.

第1図は本発明のローカルネットワークアクセス方式を
適用したローカルネットワークシステムの一実施例を示
す構成図である。同図において、一連の装置番号1.〜
nを付したn個のデータ端末(例工ばワードプロセッサ
、ファクシミリ装置。
FIG. 1 is a block diagram showing an embodiment of a local network system to which the local network access method of the present invention is applied. In the figure, a series of device numbers 1. ~
n data terminals (for example, word processors, facsimile machines).

複写装置等)1a+11)+〜l nはそれぞれアダプ
タ2a H2b +〜2nを介して1つのループ状の伝
送路3と接続され、発信側データ端末(例えばデータ端
末1a)からのデータは前記アダプタ2a、伝送路3.
受信側アダプタ(例えばアダプタzn)を介して受信側
データ端末1nで受信されるなどしてデータ端末相互間
の情報授受が行われる。
Copying machines, etc.) 1a+11)+~ln are each connected to one loop-shaped transmission path 3 via adapters 2a H2b+~2n, and data from a transmitting data terminal (for example, data terminal 1a) is transmitted to the adapter 2a. , transmission line 3.
Information is exchanged between the data terminals by being received by the receiving data terminal 1n via the receiving adapter (for example, adapter zn).

次に第2図は第1図におけるアダプタの主要&を示すブ
ロック図および第3図は第1図における伝送路の使用時
間、空き時間配分を示すタイムチャートでおる。第2図
においてアダプタ2は伝送路3の空きを検出する検出部
(以下DET ) 20と、制御部(以下CN’l’)
23を介したデータ端末1からのアクセス要求に基づき
前記伝送ν113へのアクセス要求信号として論理「1
」を立てる送出部(以下5ND)21と、前回伝送路を
使用したデータ端末の次に該伝送路を使用するデータ端
末を検出識別する識別部(以下CHK)22と、前記デ
ータ端末1からのアクセス要求および前記DE’l”2
0からの検出結果に基づき自アダプタ2内の所定のシー
クンス制御を行う前記CNT23とからなる。また第3
図VCおいて、伝送路使用中時間帯100および101
0間の空き時間帯200および201は、11個のデー
タ端末1a、lb。
Next, FIG. 2 is a block diagram showing the main parts of the adapter in FIG. 1, and FIG. 3 is a time chart showing the usage time and free time allocation of the transmission line in FIG. In FIG. 2, the adapter 2 includes a detection unit (hereinafter referred to as DET) 20 that detects the vacancy of the transmission line 3, and a control unit (hereinafter referred to as CN'l').
Based on the access request from the data terminal 1 via
”, an identification unit (hereinafter referred to as CHK) 22 that detects and identifies a data terminal that will use the transmission line next to the data terminal that used the transmission line last time, and an identification unit (hereinafter referred to as CHK) 22 that Access request and said DE'l"2
The CNT 23 performs predetermined sequence control within its own adapter 2 based on the detection results from 0. Also the third
In Figure VC, transmission path busy time periods 100 and 101
The vacant time slots 200 and 201 between 0 and 11 are 11 data terminals 1a and 1b.

%・ 〜l tl順番K、すなわち杓号A、B、〜N、A。%・ ~l tl order K, that is, ladle numbers A, B, ~N, A.

B、〜の順にそれぞれ短時間(例えば1μs)ずつ割り
尚Tられる。従って例えばデータ端末2bは前記符号B
の空き時間帯にアクセス要求信号を送出しているときの
み伝送路3へのアクセスが許可される。
T is re-divided for a short time (for example, 1 μs) in the order of B and . Therefore, for example, the data terminal 2b has the above-mentioned code B.
Access to the transmission path 3 is permitted only when the access request signal is being sent during a free time slot.

続いて本実施例のNL・作について説明する。全アダプ
タ2a、2b1〜2nのD E i” 20は常時伝送
路3を監視しており該伝送路3が一定時間使用されない
と空きと判断する。この状態て例えばデータ端末1aが
符号Aの空き時間帯に該伝送路3を使用するためアダプ
タ2a内のCN ’1’ 23にアクセス要求を出すと
、該CNT23の指示により5ND21からアクセス要
求信号を送出し該デー夕端末1aが該伝送路3を使用す
るので伝送路使用中時間帯101の状態になる。このア
クセス要求信号は全アダプタ2a、2b、 〜2nのC
l−1,に22にも伝送路3を介して与えられるので、
それぞれのCIIK22は前記データ端末1aの次に伝
送路3の使用権を与えられるデータ端末を知ることがで
きる(データ端末1aのアクセス動作)。
Next, the NL/production of this embodiment will be explained. The D E i'' 20 of all the adapters 2a, 2b1 to 2n constantly monitor the transmission line 3, and determine that the transmission line 3 is empty if it is not used for a certain period of time. When an access request is issued to the CN '1' 23 in the adapter 2a in order to use the transmission line 3 during the time period, an access request signal is sent from the 5ND 21 according to the instruction from the CNT 23, and the data terminal 1a accesses the transmission line 3. This access request signal is sent to the C of all adapters 2a, 2b, ~2n.
Since it is also given to l-1 and 22 via transmission line 3,
Each CIIK 22 can know which data terminal is given the right to use the transmission path 3 next to the data terminal 1a (access operation of the data terminal 1a).

伝送路3が杓び空き時間帯200に入ったのちAi+記
データ端末1aよりも老番号を有するデータ端末(例え
ばデータ端末1b)が符号Bの空き時ILtl帯より前
にアクセス要求を出すと、同様に該符号Bの空き時間帯
にアダプタ2bの5ND21からアクセス要求信号が送
出され、該データ端末1bが伝送路3を使用する(デー
タ端末1bのアクセス動作)。該データ端末1bにアク
セス要求がなく例えばデータ端末1nがアクセス要求を
出すときも同様にデータ端末Inのアクセス動作が行わ
れる。もし空き時間帯200の間にいずれのアダプタも
アクセス要求信号を出していないときは、空き時間帯2
01において伝送路3を使用するデータ端末のアクセス
動作を行なうなど伝送路使用データ端末が決定するまで
これを繰り返す。また前記データ端末1aが伝送路3を
使用し終った直後の空き時間帯200に2つ以上のアダ
プタ(例えばアダプタ21)および2n)がアクセス要
求信号を出しているときは、前回伝送路3を使用したデ
ータ端末(データ端末1a)よりも老番号を有するデー
タ端末(データ端末II)、〜In)に伝送路3の使用
相を与えることを各アダプタ2a。
After the transmission path 3 enters the idle time zone 200, if a data terminal (for example, data terminal 1b) with an older number than the Ai+ data terminal 1a issues an access request before the idle time ILtl zone of code B, Similarly, an access request signal is sent from the 5ND 21 of the adapter 2b during the free time slot of code B, and the data terminal 1b uses the transmission path 3 (access operation of the data terminal 1b). Even when there is no access request to the data terminal 1b and, for example, the data terminal 1n issues an access request, the access operation of the data terminal In is similarly performed. If none of the adapters has issued an access request signal during the free time period 200, the free time period 2
At step 01, the data terminal using the transmission path 3 performs an access operation, and this process is repeated until the data terminal using the transmission path is determined. Furthermore, if two or more adapters (for example, adapters 21 and 2n) are issuing access request signals in the idle time period 200 immediately after the data terminal 1a finishes using the transmission path 3, Each adapter 2a gives the use phase of the transmission path 3 to a data terminal (data terminal II), ~In) having an older number than the used data terminal (data terminal 1a).

2 b 、 〜2 n75cirff!別してイルノテ
、空き時間帯200−Bのタイミングでアダプタ2 b
にアクセス要求信号があればデータ端末1bのアクセス
動作が行われ、その伝送路使用後の空き時間帯200−
Nのタイミングでデータ端末1nのアクセス動作が行わ
れる。
2 b, ~2 n75cirff! Separately, Ilnote, adapter 2 b at the timing of free time 200-B
If there is an access request signal at
The access operation of the data terminal 1n is performed at timing N.

なお第3図に示したアダプタの各構成部はいずれも従来
技術による論理回路で容易に実現可能なものである。
It should be noted that each component of the adapter shown in FIG. 3 can be easily realized using a logic circuit according to the prior art.

本実施例によれば、各アダプタはそれぞれ伝送路の使用
状況を監視し、空き時間帯における各データ端末からの
アクセス要求信号を検出して次に伝送路を使用するデー
タ端末を識別判断するので、ローカルネットワークシス
テム全体を管理制御する複雑な共通装置は不要である。
According to this embodiment, each adapter monitors the usage status of the transmission path, detects access request signals from each data terminal during idle time, and identifies and determines the data terminal that will use the transmission path next. , there is no need for complex common equipment to manage and control the entire local network system.

本実施例ではループ、状伝送路に複数のデータ端末を接
続したローカルネットワークシステムについて示したが
、1つの伝送路に複数のデータ端末を分岐接続してなる
ローカルネットワークへの本発明のローカルネットワー
クアクセス方一式の適用を妨げるものではない。
In this embodiment, a local network system in which a plurality of data terminals are connected to a loop-shaped transmission path has been described, but the local network access of the present invention to a local network in which a plurality of data terminals are branch-connected to one transmission path is shown. This does not preclude the application of one set of methods.

以上の説明により明らかなように本発明のローカルネッ
トワークアクセス方式によれば、伝送路の空き時間帯の
極めて短い時間帯(例えばnμs)においても2つ以上
のデータ端末が1つの伝送路に同時にアクセスすること
を防ぐとともに、任意のデータ端末が伝送路を使用した
いときはこの短い時間帯の中で確集に伝送路使用後が与
えられるので、各データ端末が早くしかも乎等に伝送路
を使用することができるという効果のほか、乱数発生に
よる拘アクセス制御用の複雑な装置を必要としないとい
う効果が生じる。
As is clear from the above explanation, according to the local network access method of the present invention, two or more data terminals can simultaneously access one transmission path even during an extremely short time period (for example, nμs) when the transmission path is idle. In addition, when any data terminal wants to use the transmission path, it is given the time to use the transmission path within this short period of time, so each data terminal can use the transmission path quickly and efficiently. In addition to the effect that it is possible to do the following, there is also the effect that a complicated device for controlling access based on random number generation is not required.

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

第1図は本発明のローカルネットワークアクセス方式を
適用したローカルネットワークシステムの一実施例を示
す構成図、第2図は第1図におけるアダプタの主要部を
示すブロック図および第3図は第1図における伝送路の
使用時間、突き時間配分を示すタイムチャートである。 図において、1llallbl〜1n・・・・・・デー
タ端末、212a12bl〜2n・・・・・・アダプタ
、3・・・・・・伝送路、20・・・・・・検出部、2
1・・・・・・送出部、22・°°°°°識別部、23
°°°゛°°制御部%1001101・・・・・・伝送
路使用中時間帯、200.201・・・・・・空き時間
帯。
FIG. 1 is a block diagram showing an embodiment of a local network system to which the local network access method of the present invention is applied, FIG. 2 is a block diagram showing the main parts of the adapter in FIG. 1, and FIG. 3 is the same as in FIG. 3 is a time chart showing the usage time of the transmission path and the distribution of time in FIG. In the figure, 1llallbl to 1n...data terminal, 212a12bl to 2n...adapter, 3...transmission path, 20...detection unit, 2
1... Sending section, 22, °°°°° identification section, 23
°°°゛°°Control unit %1001101...Transmission line busy time zone, 200.201...Empty time zone.

Claims (1)

【特許請求の範囲】[Claims] 一連の装置番号を付与した複数のデータ端末相互間の情
報授受を1つの伝送路を介して行うローカルネットワー
クシステムにおいて、前記伝送路の空きを検出する検出
手段と、前記各データ端末から前記伝送路へアクセス要
求信号を送出する送出手段と、該アクセス要求信号を受
信して前回該伝送路を使用したデータ端末の装置番号よ
りも老番号を持つデータ端末に該伝送路の使用権を与え
る付与手段を備えることを特徴とするローカルネットワ
ークアクセス方式。
In a local network system in which information is exchanged between a plurality of data terminals assigned a series of device numbers via a single transmission path, there is provided a detection means for detecting an empty space of the transmission path, and a detection means for detecting an empty space of the transmission path; a sending means for sending an access request signal to a data terminal; and a granting means for receiving the access request signal and granting the right to use the transmission path to a data terminal having a device number older than the device number of the data terminal that last used the transmission path. A local network access method characterized by comprising:
JP15084182A 1982-08-31 1982-08-31 Local network access system Granted JPS5940741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15084182A JPS5940741A (en) 1982-08-31 1982-08-31 Local network access system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15084182A JPS5940741A (en) 1982-08-31 1982-08-31 Local network access system

Publications (2)

Publication Number Publication Date
JPS5940741A true JPS5940741A (en) 1984-03-06
JPH0120819B2 JPH0120819B2 (en) 1989-04-18

Family

ID=15505539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15084182A Granted JPS5940741A (en) 1982-08-31 1982-08-31 Local network access system

Country Status (1)

Country Link
JP (1) JPS5940741A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01143091A (en) * 1987-11-30 1989-06-05 Olympus Optical Co Ltd Portable information recording and reproducing device
JPH02271739A (en) * 1989-04-12 1990-11-06 Daikin Ind Ltd Transmitter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01143091A (en) * 1987-11-30 1989-06-05 Olympus Optical Co Ltd Portable information recording and reproducing device
JP2598434B2 (en) * 1987-11-30 1997-04-09 オリンパス光学工業株式会社 Electronic camera
JPH02271739A (en) * 1989-04-12 1990-11-06 Daikin Ind Ltd Transmitter
JPH0773272B2 (en) * 1989-04-12 1995-08-02 ダイキン工業株式会社 Air conditioner

Also Published As

Publication number Publication date
JPH0120819B2 (en) 1989-04-18

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