JPH01272214A - Impedance machine device - Google Patents

Impedance machine device

Info

Publication number
JPH01272214A
JPH01272214A JP10024888A JP10024888A JPH01272214A JP H01272214 A JPH01272214 A JP H01272214A JP 10024888 A JP10024888 A JP 10024888A JP 10024888 A JP10024888 A JP 10024888A JP H01272214 A JPH01272214 A JP H01272214A
Authority
JP
Japan
Prior art keywords
impedance matching
changeover switch
transmission communication
impedance
communication device
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
JP10024888A
Other languages
Japanese (ja)
Inventor
Shunji Yoshiyama
芳山　俊二
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
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 filed Critical NEC Corp
Priority to JP10024888A priority Critical patent/JPH01272214A/en
Publication of JPH01272214A publication Critical patent/JPH01272214A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To take a measure with each channel as a unit to obtain flexibility for system design by connecting a transmission communication equipment and a counter equipment directly or through a converting circuit by a changeover switch. CONSTITUTION:An impedance matching device 4 is provided with a converting circuit 7 and a changeover switch 6. A transmission communication equipment and the counter equipment are connected directly or through the converting circuit 7 by the changeover switch 7. Thus, impedance matching to the line impedance is possible by only switching of the changeover switch 6. Since a measure is taken with each channel as a unit therefore, the flexibility for system design is obtained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、伝送通信装置と対抗装置とを接続する場合の
インピーダンス整合装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an impedance matching device for connecting a transmission communication device and a counter device.

〔従来の技術〕[Conventional technology]

従来、２Ｍのインタフェースをもつ伝送通信装置を対抗
装置と接続する場合、２Ｍのラインインピーダンスの規
格が現在のところ７５Ωと１２０Ωの２種類あるため、
２種類のラインインタフェースをもつユニット（以下単
に「ユニット」という）を用意し、ラインインピーダン
スに合わせてユニットを選択して使っていた。Conventionally, when connecting a transmission communication device with a 2M interface to a counter device, there are currently two types of 2M line impedance standards: 75Ω and 120Ω.
Units with two types of line interfaces (hereinafter simply referred to as "units") were prepared and used by selecting the unit according to the line impedance.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来のラインインピーダンス整合においては、２Ｍのイ
ンタフェースをもつ伝送通信装置は７５Ω終端と１２０
Ω終端の２種類のユニットを用意する必要があった。そ
のため、ラインインピーダンスとの整合がユニット単位
であり、各チャネル単位での対応ができず、システム設
計時のフレキシビリティがなかった。In conventional line impedance matching, a transmission communication device with a 2M interface has a 75Ω termination and a 120Ω
It was necessary to prepare two types of Ω-terminated units. As a result, line impedance matching is done on a unit-by-unit basis, and cannot be matched on a channel-by-channel basis, resulting in lack of flexibility when designing the system.

〔課題を解決するための手段〕[Means to solve the problem]

このような課題を解決するために本発明によるインピー
ダンス整合装置は、変換回路と切替スイッチとを備え、
切替スイッチにより伝送通信装置と対抗装置とを直接あ
るいは変換回路を介して接続するようにしたものである
。In order to solve such problems, the impedance matching device according to the present invention includes a conversion circuit and a changeover switch,
A transmission communication device and a counter device are connected directly or via a conversion circuit by a changeover switch.

〔作用〕[Effect]

本発明によるインピーダンス整合装置においては、変換
回路によりインピーダンスが変換される。In the impedance matching device according to the present invention, impedance is converted by a conversion circuit.

〔実施例〕〔Example〕

図は本発明に係わるインピーダンス整合装置の一実施例
を示す回路図である。図において、１は伝送通信装置、
２は７５Ωの終端抵抗、３は装置間付線、４はインピー
ダンス整合装置、５は２Ｍ用ケーブル、６は切替スイッ
チ、７は変換回路としての変換トランスである。この変
換トランス７は７５Ωのインピーダンスを１２０Ωのイ
ンピーダンスに変換するものである。The figure is a circuit diagram showing an embodiment of an impedance matching device according to the present invention. In the figure, 1 is a transmission communication device;
2 is a terminating resistor of 75Ω, 3 is an inter-device connecting wire, 4 is an impedance matching device, 5 is a 2M cable, 6 is a changeover switch, and 7 is a conversion transformer as a conversion circuit. This conversion transformer 7 converts an impedance of 75Ω to an impedance of 120Ω.

図に示すように、２Ｍのインタフェースをもつ伝送通信
装置１と対抗装置（図示せず）を接続する２Ｍ用ケーブ
ル５とをつなぐときにインピーダンス整合装置４を介し
てから接続する。このインピーダンス整合装置４には２
種類の回路がはいっていて、切替スイッチ６によって、
データをスルーさせたり（対抗装置との直接接続）、変
換トランス７を通過させたりすることができる。したが
って、２Ｍのインタフェースをもつ伝送通信装置１のユ
ニットを終端抵抗２で７５Ω終端としておき、２Ｍ用ケ
ーブル５のラインインピーダンスが７５Ωのときはスイ
ッチ６を接点６ａ側にしてデータ・スルーにし、ライン
インピーダンスが１２０Ωのときはスイッチ６を接点６
ｂ側にしてインピーダンス整合を行なう。As shown in the figure, when connecting a transmission communication device 1 having a 2M interface to a 2M cable 5 that connects a counter device (not shown), the connection is made through an impedance matching device 4. This impedance matching device 4 has two
The different types of circuits are installed, and the selector switch 6 allows
The data can be passed through (direct connection with a counter device) or can be passed through the conversion transformer 7. Therefore, the unit of the transmission communication device 1 having a 2M interface is terminated with a terminating resistor 2 at 75Ω, and when the line impedance of the 2M cable 5 is 75Ω, the switch 6 is set to the contact 6a side to set data through, and the line impedance is is 120Ω, switch 6 is connected to contact 6.
Perform impedance matching on the b side.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によるインピーダンス整合装
置は、変換回路と切替スイッチとを備え、切替スイッチ
により伝送通信装置と対抗装置とを直接あるいは変換回
路を介して接続するようにしたことにより、切替スイッ
チの切替えひとつでラインインピーダンスとのインピー
ダンス整合をとることができ、また、これによりチャネ
ル単位での対応が可能となるので、システム設計上のフ
レキシビリティを有するという効果がある。As explained above, the impedance matching device according to the present invention includes a conversion circuit and a changeover switch, and the changeover switch connects the transmission communication device and the opposing device directly or through the conversion circuit. Impedance matching with the line impedance can be achieved with a single switch, and this also allows for correspondence on a channel-by-channel basis, which has the effect of providing flexibility in system design.

また、伝送通信装置は２種類のユニットを用意する必要
がないので、ユニット管理上でも優位性がある。Furthermore, since the transmission communication device does not need to prepare two types of units, it is advantageous in terms of unit management.

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

図は本発明に係わるインピーダンス整合装置の一実施例
を示す回路図である。 ｌ・・・伝送通信装置、２・・・終端抵抗、３・・・装
置間付線、４・・・インピーダンス整合装置、５・・・
２Ｍ用ケーブル、６・・・切替スイッチ、７・・・変換
トランス。 特許出願人　　　　日本電気株式会社The figure is a circuit diagram showing an embodiment of an impedance matching device according to the present invention. l...Transmission communication device, 2...Terminal resistor, 3...Inter-device connecting wire, 4...Impedance matching device, 5...
2M cable, 6... changeover switch, 7... conversion transformer. Patent applicant: NEC Corporation

Claims (1)

【特許請求の範囲】[Claims] ２Ｍのインタフェースをもつ伝送通信装置と対抗装置と
を２Ｍ用ケーブルで接続するインピーダンス整合装置に
おいて、変換回路と切替スイツチとを備え、前記切替ス
イッチにより前記伝送通信装置と前記対抗装置とを直接
あるいは前記変換回路を介して接続するようにしたイン
ピーダンス整合装置。An impedance matching device that connects a transmission communication device with a 2M interface and a counter device using a 2M cable, which includes a conversion circuit and a changeover switch, and the changeover switch connects the transmission communication device and the counter device directly or An impedance matching device connected via a conversion circuit.
JP10024888A 1988-04-25 1988-04-25 Impedance machine device Pending JPH01272214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10024888A JPH01272214A (en) 1988-04-25 1988-04-25 Impedance machine device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10024888A JPH01272214A (en) 1988-04-25 1988-04-25 Impedance machine device

Publications (1)

Publication Number Publication Date
JPH01272214A true JPH01272214A (en) 1989-10-31

Family

ID=14268933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10024888A Pending JPH01272214A (en) 1988-04-25 1988-04-25 Impedance machine device

Country Status (1)

Country Link
JP (1) JPH01272214A (en)

Similar Documents

Publication Publication Date Title
CA1179032A (en) Coaxial cable/fiber optic bus network
EP0800327A3 (en) A customer telecommunication interface device having a unique identifier
JPH0651881A (en) Communication unit
JPH01272214A (en) Impedance machine device
US4682164A (en) Attachment for remote control of a plurality of signal monitors
JPH1056660A (en) Circuit device for coupling analog transmission line to digital transmission line
US5068847A (en) Fiber optic network architecture having data feedback for monitoring communications thereon
CN213028088U (en) Distributed Dante audio gateway system
US5140172A (en) Interface module for a bus interface
KR102473539B1 (en) Splitter for transmitting internet signals and telephone signals simultaneously
JPH079467Y2 (en) Optical adapter
JPH02105644A (en) Optical switch
CN208062449U (en) A kind of telemechanical modem Special wiring converting interface
JPH0533067Y2 (en)
JPS63290433A (en) Connection system for maintenance terminal of digital data exchange
JPS62137945A (en) Data transmission control equipment
JPS6262646A (en) Loop system data transmission system for both optical and electric transmission lines
JPS59172843A (en) Optical signal transmitting and receiving device
JPS58171117A (en) Undirectional branching device
JPH02300958A (en) Bi-directional interface converting device
JPH0425236A (en) Tdm line connecting system
JPH04321333A (en) Equipment in video transmission station
HU205509B (en) Circuit arrangement for switchable matching two- or four-wire output or input circuit of a four-wire telephone channel and the central exchange
JPH01105633A (en) Data transmission equipment
JPH02272935A (en) Test data transmitting system for isdn switching system