JPH02198226A - Transmitter - Google Patents

Transmitter

Info

Publication number
JPH02198226A
JPH02198226A JP32824588A JP32824588A JPH02198226A JP H02198226 A JPH02198226 A JP H02198226A JP 32824588 A JP32824588 A JP 32824588A JP 32824588 A JP32824588 A JP 32824588A JP H02198226 A JPH02198226 A JP H02198226A
Authority
JP
Japan
Prior art keywords
transmission line
terminal device
bus
terminal equipment
type 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.)
Pending
Application number
JP32824588A
Other languages
Japanese (ja)
Inventor
Atsushi Iwaoka
岩岡　篤
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 JP32824588A priority Critical patent/JPH02198226A/en
Publication of JPH02198226A publication Critical patent/JPH02198226A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the effect of removed connector of a bus transmission line of other terminal equipment on a terminal equipment during communication and to reproduce a received data in an excellent way by providing a simulated load terminator to each receptacle. CONSTITUTION:When a device cord 6 of terminal equipments 1-3 is connected to receptacles 12-a-12-d, bus type transmission line 4 connects to a cord 6 and when the cord 6 is not connected to a receptacle, the transmission line 4 connects to a simulated load terminator 13. In this case, since the terminator 13 has an impedance equal to an input impedance of each terminal equipment, the impedance is the fixed value when viewing each receptacle from the transmission line 4 independently whether each terminal equipment is connected to each receptacle via the cord 6 or not. Thus, even when each terminal equipment is removed or connected from/to each receptacle, no effect is given onto a characteristic of a reflected distortion in the receiver side terminal equipment during communication. Thus, the receiver side terminal equipment reproduces a data in an excellent way with an equalizing parameter set by the preamble at first or the like.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、バス形伝送路に複数の端末装置が接続された
ディジタル伝送装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital transmission device in which a plurality of terminal devices are connected to a bus-type transmission path.

従来の技術 第２図は従来の伝送装置の概要を示している。Conventional technology FIG. 2 shows an outline of a conventional transmission device.

第２図において、４はバス形伝送路であり、両端を終端
器６によって終端されている。１．２．３は端末装置で
あり、機ひも６およびコンセント１１を介して各々バス
形伝送路４に接続されている。In FIG. 2, reference numeral 4 denotes a bus-type transmission line, which is terminated at both ends by terminators 6. Reference numerals 1, 2, and 3 designate terminal devices, which are connected to the bus-type transmission line 4 via a machine cord 6 and an outlet 11, respectively.

各端末装置において、７はドライバであり、８はバッフ
ァ、９は等化器、１ｏは識別器である。In each terminal device, 7 is a driver, 8 is a buffer, 9 is an equalizer, and 1o is a discriminator.

次に上記従来例の動作について説明する。第２図におい
て、端末装置１が端末装置３ヘデータを送信するものと
する。また、各端末装置をコンセントより見込んだイン
ピーダンスが、バス形伝送路の特性インピーダンス即ち
終端器５の抵抗値に比べ十分に大きくないと仮定する。Next, the operation of the above conventional example will be explained. In FIG. 2, it is assumed that the terminal device 1 transmits data to the terminal device 3. It is also assumed that the impedance of each terminal device viewed from the outlet is not sufficiently larger than the characteristic impedance of the bus-type transmission line, that is, the resistance value of the terminator 5.

端末装置１は先ずドライバ７よりプリアンブル信号を、
つづいてデータを送信し、プリアンブル信号及びデータ
は機ひも６及びバス形伝送路４を介して端末装置３のバ
ッファ８に伝播する。バッファ８で受信されたプリアン
ブル信号は等比容９に伝えられ、等比容９は受信したプ
リアンブル信号を用いて、受信期間中に伝送路の反射歪
の影響が最も少なくなるよう等化パラメータを設定する
。従って端末装置３においてプリアンブル信号受信中に
等化パラメータの設定が終了しているため、続いて受信
されるデータを識別器１ｏにおいて良好に再生すること
ができる。The terminal device 1 first receives a preamble signal from the driver 7,
Subsequently, data is transmitted, and the preamble signal and data are propagated to the buffer 8 of the terminal device 3 via the machine string 6 and the bus type transmission line 4. The preamble signal received by the buffer 8 is transmitted to the isotropic 9, which uses the received preamble signal to set equalization parameters so that the influence of reflection distortion on the transmission path is minimized during the reception period. Set. Therefore, since the equalization parameter setting is completed in the terminal device 3 while the preamble signal is being received, the subsequently received data can be reproduced satisfactorily in the discriminator 1o.

このように上記従来の伝送装置でも、反射歪が発生する
バス形伝送路で、データの送受信を行うことができる。In this way, even with the conventional transmission device described above, data can be transmitted and received through a bus-type transmission line in which reflection distortion occurs.

発明が解決しようとする課題 しかしながら、上記従来の伝送装置では、第２図におい
て端末装置１から端末装置３にデータを送信している時
に、端末装置２をコンセント１１ｂより外したり、ある
いは他の端末装置をコンセン）１１−ｄに接続したりす
ると、端末装置３での受信信号における反射歪の特性が
急変し、等比容も追従できず、データ誤りを生ずること
があるという問題があった。Problems to be Solved by the Invention However, in the conventional transmission device described above, when data is being transmitted from the terminal device 1 to the terminal device 3 in FIG. When the device is connected to the electrical outlet 11-d, the characteristics of the reflection distortion in the received signal at the terminal device 3 suddenly change, and the iso-ratio cannot be followed, causing a problem that data errors may occur.

本発明はこのような従来の問題を解決するものであり、
通信中の端末装置に対し、それ以外の端末装置のバス形
伝送路へのコネクタ着脱が影響を及ぼさない優れた伝送
装置を提供することを目的とするものである。The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent transmission device in which connecting and disconnecting a connector to a bus-type transmission path of other terminal devices does not affect the terminal device in communication.

課題を解決するための手段 本発明は上記目的を達成するために、コンセント内に、
コンセントより各端末装置を見込むインピーダンスと等
価な値を持つ疑似負荷終端器を持ち、端末装置がコンセ
ントに接続されている場合にはバス形伝送路を端末装置
の機ひもに接続し、端末装置がコンセントに接続されて
いない場合にはバス形伝送路を疑似終端器に接続するよ
うにしたものである。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a power outlet with:
It has a pseudo load terminator with a value equivalent to the impedance looking into each terminal device from the outlet, and when the terminal device is connected to the outlet, connects the bus type transmission line to the terminal device's machine string, and connects the terminal device to the terminal device. The bus type transmission line is connected to a pseudo terminator when it is not connected to an outlet.

作用 したがって、本発明によれば、バス形伝送路から見ると
、各コンセントごとに端末装置あるいは端末装置と等し
いインピーダンス特性をもつ疑似負荷終端器が常に接続
されているため、通信中以外の端末装置のコンセントを
着脱しても伝送路上の反射歪は変化しないという効果を
有する。Therefore, according to the present invention, when viewed from the bus-type transmission line, each outlet is always connected with a terminal device or a pseudo load terminator having an impedance characteristic equal to that of the terminal device. This has the effect that the reflection distortion on the transmission path does not change even if the outlet is connected or disconnected.

実施例 第１図は本発明の一実施例の概要を示す図である。第１
図において１２−ａ〜１２−ｄはコンセントであり、端
末装置の機ひも６が接続されると、バス形伝送路４を機
ひも６に接続し、端末装置の機ひも６がコンセントに接
続されないと、バス形伝送路を疑似負荷終端器１３に接
続するような切換え機能を有している。その他の構成、
データ送受信の動作は第２図の従来例と同じである。Embodiment FIG. 1 is a diagram showing an outline of an embodiment of the present invention. 1st
In the figure, 12-a to 12-d are electrical outlets, and when the terminal device's cord 6 is connected, the bus type transmission line 4 is connected to the machine cord 6, and the terminal device's cord 6 is not connected to the outlet. It also has a switching function for connecting the bus type transmission line to the pseudo load terminator 13. Other configurations,
The data transmission and reception operations are the same as the conventional example shown in FIG.

次に上記実施例の動作について説明する。Next, the operation of the above embodiment will be explained.

第１図において、端末装置１が端末装置３ヘデータを送
信するものとする。また、各端末装置の入力インピーダ
ンスはバス形伝送路の特性インピーダンスに比べ十分大
きくないものとする。端末装置１はドライバ７よりプリ
アンブル信号を送信し、続いてデータを送信する。この
プリアンブル信号およびデータはバス形伝送路４を介し
て端末装置３のバッファ８に伝播する。バッファ８で受
信されたプリアンブル信号は等比容９に伝えられ、等比
容９はプリアンブル信号受信期間中に、この信号を用い
て伝送路の反射歪の影響が最も少なくなるように等化パ
ラメータを設定する。等比容９のパラメータ設定が終了
した後に、続いてデータが受信されるので、識別器１０
で受信データを良好に再生することができる。In FIG. 1, it is assumed that the terminal device 1 transmits data to the terminal device 3. It is also assumed that the input impedance of each terminal device is not sufficiently larger than the characteristic impedance of the bus type transmission line. The terminal device 1 transmits a preamble signal from the driver 7, and then transmits data. This preamble signal and data are propagated to the buffer 8 of the terminal device 3 via the bus type transmission line 4. The preamble signal received by the buffer 8 is transmitted to the isotropic volume 9, which uses this signal to set equalization parameters during the preamble signal reception period so as to minimize the influence of reflection distortion on the transmission path. Set. After the parameter setting of the isovolume 9 is completed, data is subsequently received, so the discriminator 10
The received data can be reproduced well.

このように上記実施例によれば、端末装置が機ひもを介
してコンセントに接続されているか否かにかかわらず、
バス形伝送路からコンセントを見込むインピーダンスが
一定であるため、端末装置をコンセントにおいて脱着し
ても、通信中の受信側端末装置における反射歪の特性に
影響を及ぼさないという利点がある。In this way, according to the above embodiment, regardless of whether the terminal device is connected to the outlet via the cord,
Since the impedance looking into the outlet from the bus-type transmission path is constant, there is an advantage that even if the terminal device is attached or detached at the outlet, it does not affect the reflection distortion characteristics of the receiving terminal device during communication.

発明の効果 本発明は上記実施例より明らかなように、端末装置がコ
ンセントに接続されているか否かにかかわらず、バス形
伝送路からコンセントを見込むインピーダンスが一定で
あるため、通信中の端末装置以外の端末装置をコンセン
トにおいて脱着しても、反射歪特性の変動を生じず、受
信側端末装置は初期にプリアンブルによって設定した等
化パラメータ値のままで良好にデータを再生できるとい
う効果を有する。Effects of the Invention As is clear from the above embodiments, the present invention has a constant impedance looking into the outlet from the bus-type transmission path, regardless of whether the terminal device is connected to the outlet or not. Even if a terminal device other than the above terminal device is attached or detached from an outlet, the reflection distortion characteristics do not change, and the receiving terminal device can successfully reproduce data with the equalization parameter value initially set by the preamble.

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

第１図は本発明の一実施例における伝送装置の概略説明
図、第２図は従来の伝送装置の概略説明図である。 １．２．３・・・端末装置、４・・・パス形伝送路、６
・・終端器、６・・・機ひも、７・・・ドライバ、８・
・・バッファ、９・・・等比容、１ｏ・・・識別器、１
２−ａ〜１２−ｄ・・・コンセント、１３・・・疑似負
荷終端器。FIG. 1 is a schematic explanatory diagram of a transmission device according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram of a conventional transmission device. 1.2.3...Terminal device, 4...Path type transmission line, 6
・Terminator, 6... Machine string, 7... Driver, 8...
... Buffer, 9... Esovolume, 1o... Discriminator, 1
2-a to 12-d... Outlet, 13... Pseudo load terminator.

Claims (1)

【特許請求の範囲】[Claims] ディジタル信号を伝送するバス形伝送路と、データ信号
に先立つてプリアンブル信号を送受信する手段を持ち、
他の端末から前記バス形伝送路を経由して受信した前記
プリアンブル信号を利用して前記バス形伝送路の特性を
等化する手段を持つた複数の端末装置と、前記バス形伝
送路に接続され、複数の前記端末装置を接続するための
複数のコンセントとを備え、前記コンセントは、前記端
末装置が前記コンセントに接続されているとき前記バス
形伝送路と前記端末装置を電気的に接続し、前記コンセ
ントに前記端末装置が接続されていないとき前記端末装
置の入力インピーダンスに等しいインピーダンスをもつ
疑似負荷終端器を前記バス形伝送路に電気的に接続する
ようにした伝送装置。It has a bus type transmission path for transmitting digital signals and a means for transmitting and receiving a preamble signal prior to the data signal,
a plurality of terminal devices connected to the bus-type transmission line and having means for equalizing the characteristics of the bus-type transmission line using the preamble signal received from other terminals via the bus-type transmission line; and a plurality of outlets for connecting the plurality of terminal devices, the outlet electrically connecting the bus type transmission path and the terminal device when the terminal device is connected to the outlet. . A transmission device, wherein when the terminal device is not connected to the outlet, a pseudo load terminator having an impedance equal to the input impedance of the terminal device is electrically connected to the bus type transmission line.
JP32824588A 1988-12-26 1988-12-26 Transmitter Pending JPH02198226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32824588A JPH02198226A (en) 1988-12-26 1988-12-26 Transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32824588A JPH02198226A (en) 1988-12-26 1988-12-26 Transmitter

Publications (1)

Publication Number Publication Date
JPH02198226A true JPH02198226A (en) 1990-08-06

Family

ID=18208056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32824588A Pending JPH02198226A (en) 1988-12-26 1988-12-26 Transmitter

Country Status (1)

Country Link
JP (1) JPH02198226A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031827A1 (en) * 1995-04-04 1996-10-10 Rambus, Inc. A modular bus with single or double parallel termination
EP0932097A1 (en) * 1998-01-26 1999-07-28 Fujitsu Limited Bus controllers ensuring reduced power consumption and stable operation
JP5367823B2 (en) * 2009-08-10 2013-12-11 Ｔｏａ株式会社 Communication device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031827A1 (en) * 1995-04-04 1996-10-10 Rambus, Inc. A modular bus with single or double parallel termination
DE19681337B4 (en) * 1995-04-04 2008-02-07 Rambus Inc., Mountain View High speed modular bus architecture for computer system - has motherboard datanet passing data signals between master and module devices over terminated module data net of removable module
EP0932097A1 (en) * 1998-01-26 1999-07-28 Fujitsu Limited Bus controllers ensuring reduced power consumption and stable operation
US6073195A (en) * 1998-01-26 2000-06-06 Fujitsu Limited Bus controllers ensuring reduced power consumption and stable operation
JP5367823B2 (en) * 2009-08-10 2013-12-11 Ｔｏａ株式会社 Communication device

Similar Documents

Publication Publication Date Title
EP0405743B1 (en) Bidirectional transceiver for high speed data system
US4412326A (en) Collision avoiding system, apparatus and protocol for a multiple access digital communications system including variable length packets
JP2909084B2 (en) Run communication device and media adapter used for it
CA1087258A (en) Circuit for wire transmission of high frequency data communication pulse signals
JPH06216917A (en) Multiplex device consumer electronics system
US7430161B2 (en) Cross-connected cable interconnection
CA1287197C (en) Battery feed circuit for a telephone system
EP1380145A2 (en) Method for inverse multiplexing
US4549049A (en) Arrangement for testing a device provided with an echo canceller
US5715287A (en) Method and apparatus for dual purpose twisted pair interface circuit for multiple speed media in a network
US4775864A (en) Local area network with multiple node bus topology
CA2127082A1 (en) System for Increasing the Capacity of Existing Local Area Networks that Use Shielded Twisted Wire Pair Medium
JPH02198226A (en) Transmitter
US5402444A (en) Synchronous data interface circuit and method of equalizing synchronous digital data therefor
JP3581490B2 (en) Optical transmission device, digital signal transmission device, and digital signal transmission method
CN111565272B (en) Device and method for long-distance transmission of camera data through parallel bus
JPH06224976A (en) Interface conversion circuit for half duplex serial transmission
WO1988001459A1 (en) Local area network interconnecting computer products via long telephone lines
CN211830928U (en) Device for long-distance transmission of camera data by parallel bus
JPS6056343B2 (en) Impedance matching type two-wire transmission system with additional loop compensation circuit
JPH03278742A (en) Digital transmission system
SU1626424A1 (en) Duplex signal transmission system
JPS5836060A (en) Power supply system of electronic key telephone set
AU677109B2 (en) Compensation of attentuation in switching arrangement
JPS5916434A (en) Optical communication system