JPS59132258A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPS59132258A
JPS59132258A JP692983A JP692983A JPS59132258A JP S59132258 A JPS59132258 A JP S59132258A JP 692983 A JP692983 A JP 692983A JP 692983 A JP692983 A JP 692983A JP S59132258 A JPS59132258 A JP S59132258A
Authority
JP
Japan
Prior art keywords
data
signal
station
collision
transmission
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
JP692983A
Other languages
Japanese (ja)
Other versions
JPH043702B2 (en
Inventor
Koichi Nakamura
公一 中村
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP692983A priority Critical patent/JPS59132258A/en
Publication of JPS59132258A publication Critical patent/JPS59132258A/en
Publication of JPH043702B2 publication Critical patent/JPH043702B2/ja
Granted legal-status Critical Current

Links

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]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]

Landscapes

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

Abstract

PURPOSE:To detect collision of data without management of data delay time at each sation by using a recognizing signal where its carrier frequency is common to all stations and a modulating frequency is specific to each station. CONSTITUTION:A data transmitter 104 detecting a commuication medium 1 as an idle cable transmits the information from a utilizing device 704 to the medium 1. A recognizing signal transmitter 304 transmits a collision confirming signal in modulating frequency f4 at a carrier frequency f0 to the medium 1 at the same time and a recognizing signal receiver 404 receives the signal. In this case, a collision detector 504 generates a collision signal when it confirms that the signal in the f0 received by the device 404 has a frequency component being not the own f4. In response to the presence of the collision signal a transmission interrupting device 604 interrupts the signal transmission from the device 104 to the medium 1. A collision detector 506 is operated also at a station side 906 during a series of operation and the signal transmission from a data transmitter 106 to the medium 1 is interrupted by a transmitter interrupting device 606.

Description

【発明の詳細な説明】 産業上の利用分野 本発明はデータパケットを利用したデータ通信システム
に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a data communication system using data packets.

従来例の構成とその問題点 近年、計算装置の間の通信に対する要求はますます高ま
りつつあり、とりわけマイクロコンピュータを利用した
データ通信システムに於いては、特にそれらが具備する
計算の処理能力の最適化と計算機の故障によるデータ通
信装置全体に対する影響を低減させるための分散制御の
有利性と、デ・−夕の伝送効率向上をめざす手段として
のパケット交換技術に注目さ−れ、これらの技術を利用
した安価で信頼性のある通信システムが求められている
。Conventional configurations and their problems In recent years, demands for communication between computing devices have been increasing more and more, especially in data communication systems using microcomputers. The advantages of distributed control for reducing the impact of computer failures on data communication equipment as a whole, and packet switching technology as a means of improving data transmission efficiency, have attracted attention. There is a need for inexpensive and reliable communication systems that utilize

第１図は従来のデータ通信シテスムのブロック図夕示す
ものであり、（１）は通信媒体で、同軸ケーフブル、光
学ファイバ、撚線ケーブル、またはそれに類似のものの
うち任意の１つまたはその複合から成るものである。（
２）は通信媒体（１）のインピーダンス整合をとる終端
器、Ｃ１０１）Ｃ１０２）Ｃ１ｏ３）は通信媒体（１）
を介して信号を送信するデータ送信装置、（２０１に２
０２８２０８）は通信媒体（１）に通信された信号を受
信するデータ受信装置、（８０１）はデータ送信装置（
ｌｏｌ）が通信媒体（１）に送信した信号がデータ受信
装置（２０１）で受信されるまでの伝送遅延時間と等し
い遅延を持つデータ遅延装置、同様に（８０２）はノブ
〒り・、送信装置（１０２）とデータ受信装置（２０２
）間の伝送遅延時間と等しい遅延を持つデータ遅延袋数
、（８０Ｂ）はデータ送信装置（１０Ｂ）とデータ受信
装置（２０８）間の伝送遅延時間と等しい遅延を持つデ
ータ遅延装置、（４０１）はデータ遅延装置（８０１）
を介して入力されるデータ送信装置！　（１０１）の信
号とデータ受信装置（２０１）より入力される信号とに
不一致が発生した時はただちに、衝突信号を発生する衝
突検出装置、同一に（４０２）はデータ遅延装置（８０
２）とデータ受信装置（２０２）とからの入力信号によ
る衝突検出装置、（４０８）はデータ遅延装置（８０ｇ
）とデータ受信装置（２０８）とからの入力信号量ζよ
、る衝突検出装置、（５０１Ｘ５０２）（５０８）はそ
れぞれ衝突検出装置（４０１）（４０２）（４０Ｂ）よ
りの衝突信号の存在に応答して各データ送信装置（１０
１）（１０２）（１０８）による通信媒体（１）べの信
号の伝送を中断させる伝送中断装置、（６０１）（６０
２）（６０８）はそれぞれデータ送信装置（１０１）（
１０２）（１０８）及びデータ受信装置（２０１）（２
Ｑ２Ｘ２０８）と接続され通信媒体（１）を介して伝送
される信号を利用・する利用装置、（９０１）は構成要
素にデータ送信装置（１０１）、データ受信装置（２０
１）４−、データ遅延装置（８０１）　、衝突検出装置
（４０１）　、伝送中断装置（５０１）　、利用装置（
６０１）を持つステーション、（９０２）（９０８）も
同様の構成要素よりなるステーションである。FIG. 1 shows a block diagram of a conventional data communication system, in which (1) is a communication medium made of any one of coaxial cable, optical fiber, twisted cable, or the like, or a combination thereof; It is what it is. (
2) is a terminator that matches the impedance of the communication medium (1), C101) C102) C1o3) is the communication medium (1)
a data transmitting device (201 to 2) that transmits a signal via
028208) is a data receiving device that receives signals communicated on the communication medium (1), and (801) is a data transmitting device (
(802) is a data delay device having a delay equal to the transmission delay time until the signal transmitted by the device (lol) to the communication medium (1) is received by the data receiving device (201), and similarly (802) is a knob, a transmitting device. (102) and a data receiving device (202)
), (80B) is the data delay device with a delay equal to the transmission delay time between the data transmitting device (10B) and the data receiving device (208), (401) is a data delay device (801)
Data transmission device input via! (402) is a collision detection device that immediately generates a collision signal when a mismatch occurs between the signal input from the data receiving device (201) and the signal input from the data receiving device (201);
2) and a data receiving device (202), a collision detection device (408) is a data delay device (80g
) and the data receiving device (208), the collision detection devices (501X502) (508) respond to the presence of collision signals from the collision detection devices (401) (402) (40B), respectively. and each data transmitting device (10
1) Transmission interrupting device for interrupting the transmission of signals by communication media (1) (102) and (108), (601) and (60)
2) (608) are data transmitting devices (101) (
102) (108) and data receiving device (201) (2
A usage device (901) that is connected to Q2
1) 4-, data delay device (801), collision detection device (401), transmission interruption device (501), utilization device (
601) and stations (902) and (908) are also stations consisting of similar components.

以上の様に構成された従来のデータ通信システムについ
て、以下その動作について説明する。The operation of the conventional data communication system configured as described above will be explained below.

まず、通信媒体（１）を休止ケーブルとして検知したデ
ータ送信装置（１０１）は利用装置（６０１）の要求に
より利用装置（６０１）で準備した情報を通信媒体（１
）へ送信を開始する。この送信開始と同時に情報はデー
タ遅延装置（８０１）へも送られる。通信媒体（１）に
送信された情報は通信媒体（１）上を伝播してデータ受
信装置（２０１）に到達する。この時伝播遅延のために
他の１つのステーション（９０８）は通信媒体（１）へ
伝送を始めているかもしれない。この特別な偶然性を調
整するために衝突検出装＠　（４０１）はデータ遅延装
置（８０１）を介して入力されるデータ送信装置（１０
１）が送信している信号とデータ受信装置（２０１）が
受信している信号とを比較した差異か発見された場合に
衝突信号を発ルし、この衝突信号の存在に伝送中断装置
（５０１）が応答してデータ送信装置（１０１）による
通信媒体（１）への信号の伝送を中断させる。この一連
の動作時、ステーション（９０８）　側でも衝突検出装
置（４０８）が作動し、伝送中断（５０８）によりデー
タ送信装置（１０Ｂ）の通信媒体（１）への信号の伝送
は中断される。First, the data transmitting device (101) detects the communication medium (1) as a suspended cable, and transmits information prepared by the device (601) to the communication medium (1) in response to a request from the device (601).
). At the same time as this transmission starts, information is also sent to the data delay device (801). Information transmitted to the communication medium (1) propagates on the communication medium (1) and reaches the data receiving device (201). At this time, one other station (908) may have started transmitting onto the communication medium (1) due to propagation delays. In order to adjust for this special coincidence, the collision detection device @ (401) receives data from the data transmission device (10) which is input via the data delay device (801).
1) and the signal received by the data receiving device (201), a collision signal is emitted when a difference is found between the signal being transmitted by the data receiving device (201) and the signal being received by the data receiving device (201). ) responds by interrupting the transmission of the signal by the data transmitting device (101) to the communication medium (1). During this series of operations, the collision detection device (408) also operates on the station (908) side, and the transmission of the signal to the communication medium (1) of the data transmitting device (10B) is interrupted due to the transmission interruption (508).

しかしながら、上記のような構成ではステーション（９
０１）のデータ送信装置（１０１）とデータ受信装置（
２０１）との間の伝播遅延時間とステーション（９０Ｂ
）のデータ伝信装置（１０８”）とデータ受信装置（２
０８）との間の伝播遅延時間は異なり、同様にステーシ
ョン（９０２）のそれとも異なるｔこめ、データ遅延装
置（８０１）（８０２）（８０８）の遅延時間はそれぞ
れ個別に設定しなくてはならず、また通信媒体（１）と
の接続点を変更すれば設定しなおさなければならないと
いう欠点を有している。However, in the above configuration, the station (9
01) data transmitting device (101) and data receiving device (
201) and the propagation delay time between the station (90B
) data transmission device (108”) and data reception device (2
The propagation delay time between station (902) and data delay device (801) (802) (808) must be set individually. Also, it has the disadvantage that if the connection point with the communication medium (1) is changed, the settings must be reset.

発明、の目的 本発明はステーションごとの遅延時間管理を不要とでき
るデータ通信システムを提供することを目的とする。OBJECTS OF THE INVENTION An object of the present invention is to provide a data communication system that eliminates the need for delay time management for each station.

発明の構成 本発明のデータ通信システムは、データを送受信するデ
ータ送信装置とデータ受信装置を有するステーションを
複数設け、この各ステーションを共通の通信媒体に接続
すると共に、各ステーションにそれぞれ、自己のステー
ションの送信時に他のステーションと同一の搬送波周波
数ヲソのステーション固有の変調信号で変調した認識信
号を前記通信媒体に送信する認識信号送信装置と、通信
媒体から受信した前記認識信号が自己のステーションの
ものでない場合に前記データ送信装置による自己のステ
ーションのデータ送信を中断させる衝突伝送中断手段と
を設けた仁とを特徴とする。Structure of the Invention The data communication system of the present invention includes a plurality of stations each having a data transmitting device and a data receiving device for transmitting and receiving data, each of which is connected to a common communication medium, and each station has its own station. a recognition signal transmitter that transmits to the communication medium a recognition signal modulated with a station-specific modulation signal having the same carrier frequency as that of other stations when transmitting the recognition signal, and the recognition signal received from the communication medium is that of the own station. and collision transmission interrupting means for interrupting the data transmission of the own station by the data transmitting device when the data transmission device does not transmit data to its own station.

実施例の説明 以下、本発明の一実施例を第２図に基づいて説明する。Description of examples Hereinafter, one embodiment of the present invention will be described based on FIG. 2.

第２図に於いて、（１）は第１図と同様に同軸ケーブル
、光学ファイバ、撚り線ケーブル、またはそれに類似の
もののうちの任意の１つまたはその複合で構成される通
信媒体、（２）も第１図と同様通信媒体（１）のインピ
ーダンス整合用の終端器、（１ｏ＋）（ｌｏ５）（１ｏ
６）は通信媒体（１）を介してデータ信号を送信するデ
ータ送信装置、（２０４Ｘ２０５）（２０６）は通信媒
体（１）に通信されたデータ信号を受信するデータ受信
装置、（８０４）（８０５）（８０６）はそれぞれ通信
媒体（１ンを介して、後述する全てのステーション共通
の搬送波周波数をもち各ステーションごとに固有周波数
で変調をかけた衝突確認信号を送信する認識信号送信装
置、（４０４）（４０５）（４０６）は衝突確認信号を
受信する認識信号受信装置、（５０４）（５０５）（５
０６）はそれぞれ認識信号受信装＠　（４０４Ｘ４０５
）（４０６）で受信した信号にそれぞれ認識信号送信装
置（８０４）（８０５）（ｔｌＯ（ｉ）でない変調信号
が検出された時に直ちに衝突信号を発生する衝突検出装
置、（６０４）（６０５）（６０６）はそれぞれ衝突検
出装置（５０４）（５０５）（５０６）よりの衝突信号
の存在に応答してそれぞれデータ送信装置（１０４８１
０５ＸＬＯ６）による通信媒体（１）への信号の伝送を
中断させる伝送中断装置、（７０４）（７０５）（７０
りはそれぞれデータ送信装置（１０４）（１０６）　（
１０６）と認識信号送信装置（３０４）（３０５）（１
０６）とデータ受信装置（２０４）（２０５）（２０６
）と接続されており通信媒体（１）を介して伝送される
データ信号を利用して認識信号送信装置（８０４）（８
０５）（８０６）の作動・停止を指示する利用装置、（
９０４）は構成要素にデータ送信装置（１０４）、デー
タ受信装置（２０４）、認識信号送信装置（８０４）、
認識信号受信装置（４０４人衝突検出装置（５０４）　
、伝送中断装置（６０４）、利用装置（７０４）を持つ
ステーション、（９０５）　（９０６）も同様の構成要
素よりなるステーションである。In FIG. 2, (1) is the same as in FIG. ) is also a terminator for impedance matching of communication medium (1), (1o+)(lo5)(1o
6) is a data transmitting device that transmits a data signal via the communication medium (1), (204X205) (206) is a data receiving device that receives the data signal communicated through the communication medium (1), (804) (805) ) (806) is a recognition signal transmitting device (404) that transmits a collision confirmation signal having a carrier frequency common to all stations, which will be described later, and modulated with a unique frequency for each station, via a communication medium (1), respectively. )(405)(406) are recognition signal receiving devices that receive collision confirmation signals, (504)(505)(5
06) are recognition signal receivers @ (404X405
) (406), respectively, recognition signal transmitting devices (804) (805) (collision detection devices that immediately generate collision signals when a modulated signal other than tlO(i) is detected, (604) (605) ( 606) respectively transmit the data transmitting device (10481) in response to the presence of a collision signal from the collision detection device (504) (505) (506).
Transmission interrupting device (704) (705) (70
data transmitting devices (104) (106) (
106) and recognition signal transmitting devices (304) (305) (1
06) and data receiving devices (204) (205) (206)
) is connected to the recognition signal transmitting device (804) (8) using the data signal transmitted via the communication medium (1).
05) Utilization device that instructs the operation/stop of (806), (
904) includes a data transmitting device (104), a data receiving device (204), a recognition signal transmitting device (804),
Recognition signal receiving device (404 person collision detection device (504)
, a transmission interrupting device (604), a station having a utilization device (704), and (905) and (906) are also stations composed of similar components.

以上のように構成された本実施例のデータ通信システム
についで以下その動作を説明する。The operation of the data communication system of this embodiment configured as described above will be explained below.

まず、通信媒体（１）を休止ケーブルとして検知したデ
ータ送信装置（１０４）は利用装置（７０４）の要求に
より利用装置（７０４）で準備した情報を通信媒体（１
）に送信を開始する。この送信開始と同時に利用装［（
７０４）は認識信号送信装置（８０４）に対し作動を許
可する。作動を許可された認識信号送信装置（８０４）
は搬送波周波数ｆ。で変調周波数ｆ４の衝突確認信号の
通信媒体（１）への送信を開始する。さらに認識信号受
信装置　（４０４）も同時に受信を開始する。First, the data transmitting device (104), which has detected the communication medium (1) as a suspended cable, sends information prepared by the device (704) to the communication medium (1) in response to a request from the device (704).
) to start sending. At the same time as this transmission starts, the user device [(
704) permits the recognition signal transmitting device (804) to operate. Recognition signal transmitting device (804) that is permitted to operate
is the carrier frequency f. At this point, transmission of the collision confirmation signal of modulation frequency f4 to the communication medium (1) is started. Furthermore, the recognition signal receiving device (404) also starts receiving at the same time.

この時、伝播遅延のためその他の１つのステーション（
９０りは通信媒体（１）へ伝送を始めているかもしれな
い。すなわち、データ送信装置（１０６）は利用装置（
７０６）で準備した情報を通信媒体（１）に送信し、認
識信号送信装置７　（８０６）は搬送波周波数がステー
ション（９０４）の認識信号送信装置（８０４）と同じ
ｆｏで変調周波数は認識信号送信装置（’１０４）とは
異なるｆ６の衝突確認信号の通信媒体（１）への送信し
始めているかもしれない。この特別な偶然性を調整する
ために衝突検出装置（５０４）は認識信号受信装置（４
０４）が搬送波周波数ｆ、で受信した信号を自らのステ
ーションの変調周波数ｆ４でない周波数成分を確認した
場合に衝突信号を発生し、この衝突信号の存在に応答し
て伝送中断装置（６０４）はデータ送信装置（１０４）
　ｉこよる通信媒体（１）への信号の伝送’ｘ　中断さ
せる。この一連の動作時ステーション（９０６）側でも
衝突検出装置１　（５０６）が作動し伝送中断装置（６
０６）によりデータ送信装置（１０６）の通信媒体（１
）への信号の伝送は中断される。At this time, due to propagation delay, one other station (
90 may have started transmission to the communication medium (1). That is, the data transmitting device (106) is the user device (
The information prepared in step 706) is transmitted to the communication medium (1), and the recognition signal transmitter 7 (806) has the same carrier frequency fo as the recognition signal transmitter (804) of the station (904), and the modulation frequency is the recognition signal transmitter. The device ('104) may have started transmitting a different f6 collision confirmation signal to the communication medium (1). In order to adjust for this special coincidence, the collision detection device (504) uses the recognition signal receiving device (4).
04) generates a collision signal when it confirms a frequency component other than the modulation frequency f4 of its own station in the signal received at the carrier frequency f, and in response to the existence of this collision signal, the transmission interrupting device (604) Transmitting device (104)
The transmission of the signal to the communication medium (1) by i is interrupted. During this series of operations, the collision detection device 1 (506) also operates on the station (906) side, and the transmission interruption device (6)
06), the communication medium (1) of the data transmitting device (106)
) is interrupted.

このように本実施例によれば、各ステーション固有の変
調周波数を持つ認識信号送信装＠　（８０４）（８０５
）　＜５ｏｉｓ）と認識信号受信装置（４０４）（４０
５）（４０す、衝突検出装置（５０４）（５０５）（５
０６）　、伝送中断装置（６０４）（６０５）（６０６
）とをデータ送信装置（１０４）（１０５）（１０６）
とデータ受信装置（２０４＞（２０５）（２０６）と別
に設けることにより、各ステーション（９０４）（９０
５）　（９０６）のデータ遅延時間の管理をなくすこと
ができる。In this way, according to this embodiment, the recognition signal transmitter @ (804) (805
) <5ois) and recognition signal receiving device (404) (40
5) (40s, collision detection device (504) (505) (5
06), transmission interrupting device (604) (605) (606
) and the data transmitting device (104) (105) (106)
By providing the data receiving device (204>(205)(206) separately, each station (904)(90
5) Management of data delay time (906) can be eliminated.

発明の詳細 な説明のように本発明のデータ通信システムによると、
ステーションごとに搬送波周波数は全てステーション共
通で変調周波数が各ステーション固有の認識信号をデー
タ送信と共に送信し、自らのステーション以外の変調周
波数の存在を確認した時に自己のステーションの送信を
中断させるよう構成したため、各ステーションごとにデ
ータ遅延時間の管理をすることなく衝突を検出すること
ができ、その実用的効果は大きいものである。According to the detailed description of the invention, the data communication system of the present invention includes:
For each station, the carrier wave frequency is common to all stations, but the modulation frequency is unique to each station.A recognition signal is transmitted along with data transmission, and when the existence of a modulation frequency other than the station's own station is confirmed, the transmission of the own station is interrupted. , collisions can be detected without managing data delay time for each station, and its practical effects are significant.

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

第１図は従来のデータ通信システムのブロック図、第２
図は本発明の実施例におけるデータ通信システムのブロ
ック図である。 （１）・・・通信媒体、（２）・・・終端器、（１０４
）（１０５Ｘ１０６）・・・データ送信装置、（２０４
）（２０５）（２０６）・・・データ受信装置、（８０
４）（８０５）（８０６）・・・認識信号送信装置、（
４０４８４０５）（４０６）・・・認識信号受信装置、
（５０１）（５０２）（５０８）・・・伝送中断装置、
（ＪＭ）４）（５０５）（５０６）・・・衝突検出装置
、（６０４）（６０５）（６０６）・・・伝送中断装置
、（７０４）（７０５）（７０６）・・・利用装置、（
９０４８９０５）（９０６）・・シスチージョン 代理人　　森本義弘 第１図 第２図Figure 1 is a block diagram of a conventional data communication system, Figure 2 is a block diagram of a conventional data communication system.
The figure is a block diagram of a data communication system in an embodiment of the present invention. (1)...Communication medium, (2)...Terminator, (104
)(105X106)...Data transmission device, (204
)(205)(206)...Data receiving device, (80
4)(805)(806)...Recognition signal transmitting device, (
4048405) (406)... recognition signal receiving device,
(501) (502) (508)...Transmission interrupting device,
(JM) 4) (505) (506)... Collision detection device, (604) (605) (606)... Transmission interruption device, (704) (705) (706)... Utilization device, (
9048905) (906)...Systition agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] ■、　データを送受信するデータ送信装置とデータ受信
装置を有するステーションを複数設け、この各ステーシ
ョンを共通の通信媒体に接続すると共に、各ステーショ
ンにそれぞれ、自己のステーションの送信時に他のステ
ーションと同一の搬送波周波数をそのステーション固有
の変調信号で変調した認識信号を前記通信媒体に送信す
る認識信号送信装置と、通信媒体から受信した前記認識
信号が自己のステーションのものでない場合に前記デー
タ送信装置による自己のステーションのデプタ送信を中
断させる衝突伝送中断手段とを設けたデータ通信システ
ム。(2) A plurality of stations each having a data transmitting device and a data receiving device for transmitting and receiving data are provided, and each station is connected to a common communication medium, and each station is given the same information as other stations when transmitting its own station. a recognition signal transmitter that transmits to the communication medium a recognition signal whose carrier frequency is modulated by a modulation signal specific to that station; a data communication system comprising collision transmission interrupting means for interrupting depter transmission of a station.
JP692983A 1983-01-18 1983-01-18 Data communication system Granted JPS59132258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP692983A JPS59132258A (en) 1983-01-18 1983-01-18 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP692983A JPS59132258A (en) 1983-01-18 1983-01-18 Data communication system

Publications (2)

Publication Number Publication Date
JPS59132258A true JPS59132258A (en) 1984-07-30
JPH043702B2 JPH043702B2 (en) 1992-01-24

Family

ID=11651933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP692983A Granted JPS59132258A (en) 1983-01-18 1983-01-18 Data communication system

Country Status (1)

Country Link
JP (1) JPS59132258A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62501811A (en) * 1985-01-30 1987-07-16 ヒユ−ズ・エアクラフト・カンパニ− Data bus pilot tone

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62501811A (en) * 1985-01-30 1987-07-16 ヒユ−ズ・エアクラフト・カンパニ− Data bus pilot tone
US4683471A (en) * 1985-01-30 1987-07-28 Hughes Aircraft Company Data bus pilot tone

Also Published As

Publication number Publication date
JPH043702B2 (en) 1992-01-24

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