JPH079467Y2 - Optical adapter - Google Patents
Optical adapterInfo
- Publication number
- JPH079467Y2 JPH079467Y2 JP1989028222U JP2822289U JPH079467Y2 JP H079467 Y2 JPH079467 Y2 JP H079467Y2 JP 1989028222 U JP1989028222 U JP 1989028222U JP 2822289 U JP2822289 U JP 2822289U JP H079467 Y2 JPH079467 Y2 JP H079467Y2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- station
- optical adapter
- attenuation
- path
- 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 - Lifetime
Links
Description
【考案の詳細な説明】 ＜産業上の利用分野＞ 本考案はローカルエリアネットワーク（以下、LANとす
る）等に用いられ、通信信号を復調して再送信する（以
下、リピータとする）機能を有する光アダプタに関する
ものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention is used for a local area network (hereinafter, referred to as LAN) and the like, and has a function of demodulating and retransmitting a communication signal (hereinafter, referred to as a repeater). The present invention relates to an optical adapter.
＜従来の技術＞ このような光アダプタが適用される通信システムの一例
を第５図に示す。<Prior Art> An example of a communication system to which such an optical adapter is applied is shown in FIG.
図で、１は幹線、２は通信機能を有するステーション、
３はステーション２を幹線１に接続する支線である。支
線３としては、例えば同軸ケーブルが用いられる。In the figure, 1 is a trunk line, 2 is a station having a communication function,
A branch line 3 connects the station 2 to the main line 1. As the branch line 3, for example, a coaxial cable is used.
４は幹線１に複数のステーションを結合させる分岐器
で、結合部分のインピーダンスの整合をとっている。イ
ンピータダンスの整合は、分岐器４で、幹線１の接続端
子と支線３の接続端子からみたインピーダンスが等しく
なるように整合することである。Reference numeral 4 is a branching device for connecting a plurality of stations to the main line 1 to match the impedance of the connecting portion. Impedance matching is performed by the branching device 4 so that the impedances of the connection terminals of the trunk line 1 and the branch lines 3 are equal.
５は幹線１の終端に設けられた終端器で、終端からみた
インピーダンスが分岐器４の各端子からみたインピーダ
ンスと等しくなるように整合をとる。Reference numeral 5 denotes a terminator provided at the end of the main line 1, which is matched so that the impedance seen from the end becomes equal to the impedance seen from each terminal of the branching device 4.
６はリピータ機能を有し支線３により分岐器４に接続さ
れた光アダプタ、７は光アダプタ６どうしを接続する光
ファイバである。通信信号は、光ファイバ７を伝送され
るときは、光アダプタ６内に設けられた光電変換器（図
示せず）で光信号に変換される。Reference numeral 6 is an optical adapter having a repeater function and connected to the branching device 4 by the branch line 3, and reference numeral 7 is an optical fiber connecting the optical adapters 6 to each other. When transmitted through the optical fiber 7, the communication signal is converted into an optical signal by a photoelectric converter (not shown) provided in the optical adapter 6.
このようなシステムにおいて、光ファイバ７を経由する
通信信号の順路は、 ステーション→支線→分岐器→幹線→分岐器→支線→光
アダプタ→光ファイバ→光アダプタ→支線→分岐器→幹
線→分岐器→支線→ステーションの順になっている。In such a system, the route of communication signals through the optical fiber 7 is as follows: station → branch line → branch device → main line → branch device → branch line → optical adapter → optical fiber → optical adapter → branch line → branch line → branch device → Branches → Stations.
光アダプタ６は、幹線のケーブル長、分岐器の数等によ
り決まるシステム規模の限界を超えるような通信システ
ムを構築する場合に使用される。The optical adapter 6 is used when constructing a communication system that exceeds the system scale limit determined by the cable length of the trunk line, the number of branching devices, and the like.
＜考案が解決しようとする課題＞ 第５図に示すようなシステムにおいて、光アダプタ６に
接続するステーション数が非常に少ない場合、光アダプ
タのメインテナンスを行う場合などにおいて、ステーシ
ョンを光アダプタに直接接続すると、光アダプタとステ
ーションの間では、通信信号をほとんど減衰しないで送
受信することになる。これによって、それぞれの機器の
受信信号レベルの最大許容値を超えてしまうことになる
ため、分岐器、幹線、支線などの通信媒体を敷設しこれ
らをを経由してステーションを接続しなければならなか
った。<Problems to be Solved by the Invention> In a system as shown in FIG. 5, when the number of stations connected to the optical adapter 6 is very small, or when maintenance of the optical adapter is performed, the stations are directly connected to the optical adapter. Then, the communication signal is transmitted and received between the optical adapter and the station with almost no attenuation. As a result, the maximum allowable value of the received signal level of each device will be exceeded.Therefore, it is necessary to lay communication media such as branch devices, trunk lines, branch lines, etc., and connect stations via these. It was
本考案はこのような問題点を解決するためになされたも
のであり、光アダプタとステーションを直接接続して
も、それぞれの機器で送受信信号レベルが最大許容値を
超えることがない光アダプタを実現することを目的とす
る。The present invention has been made to solve such a problem, and realizes an optical adapter in which the transmission / reception signal level of each device does not exceed the maximum allowable value even if the optical adapter and the station are directly connected. The purpose is to do.
＜課題を解決するための手段＞ 本考案は次のとおりの構成はになった光アダプタであ
る。<Means for Solving the Problems> The present invention is an optical adapter having the following configuration.
（１）幹線と、通信機能を有するステーションと、この
ステーションを前記幹線に接続する支線と、この支線を
幹線に接続する際に接続部分のインピーダンスの整合を
とる分岐器と、前記ステーションと同様に支線と分岐器
を介して幹線に接続され通信信号を復調する光アダプタ
と、光アダプタどうしを接続する光ファイバとを有する
通信システムにおいて、 光ファイバによって互いに接続され、通信信号を復調す
る光アダプタ回路と、 支線を介して前記分岐器と接続され、ステーションの送
受信信号と同レベルの信号が送受信可能な第１の端子
と、 支線を介して前記ステーションが直接接続され、ステー
ションの送受信信号と同レベルの信号が送受信可能な第
２の端子と、 減衰量の大きい経路と減衰量の小さい経路とを有し、前
記減衰量の大きい経路は前記光アダプタ回路と前記第２
の端子とを接続し、前記減衰量の小さい経路は光アダプ
タ回路と前記第１の端子とを接続する分岐回路と、 を具備し、前記第１の端子を経由してステーションと送
受信する低レベルの信号は前記減衰量の小さい経路で減
衰し、前記第２の端子を経由してステーションと送受信
する高レベルの信号は前記減衰量の大きい経路で減衰す
ることを特徴とする光アダプタ。(1) A trunk line, a station having a communication function, a branch line connecting the station to the trunk line, a branching device for matching impedance of a connecting portion when connecting the branch line to the trunk line, and the same as the station. In a communication system having an optical adapter connected to a trunk line via a branch line and a branching device to demodulate a communication signal, and an optical fiber connecting the optical adapters to each other, an optical adapter circuit connected to each other by an optical fiber to demodulate a communication signal And a first terminal connected to the branching device via a branch line and capable of transmitting and receiving a signal of the same level as the transmission / reception signal of the station, and the station is directly connected via a branch line to the same level as the transmission / reception signal of the station. A second terminal capable of transmitting and receiving the signal, and a path with a large amount of attenuation and a path with a small amount of attenuation. The path with a large path is the optical adapter circuit and the second
And a branch circuit connecting the optical adapter circuit and the first terminal to each other, and a path having a small amount of attenuation is connected to the terminal, and a low level for transmitting / receiving to / from the station via the first terminal. Is attenuated along the path with the smaller attenuation amount, and the high level signal transmitted to and received from the station via the second terminal is attenuated along the path with the larger attenuation amount.
（２）前記支線を前記第１の端子または第２の端子に選
択的に接続するセレクタを具備したことを特徴とする請
求項（１）記載の光アダプタ。(2) The optical adapter according to (1), further comprising a selector that selectively connects the branch line to the first terminal or the second terminal.
＜作用＞ このような本考案では、幹線と分岐器を省略してステー
ションが直接接続された光アダプタの端子を経由する通
信信号は減衰量を多くして信号レベルが最大許容値を越
えないように抑制する。<Operation> In the present invention, the communication signal passing through the terminal of the optical adapter directly connected to the station by omitting the trunk line and the branching device is increased in attenuation so that the signal level does not exceed the maximum allowable value. Suppress to.
＜実施例＞ 以下、図面に用いて本考案を説明する。<Example> Hereinafter, the present invention will be described with reference to the drawings.
第１図は本考案にかかる光アダプタの一実施例の構成図
である。第１図で第５図と同一のものは同一符号を付け
る。FIG. 1 is a block diagram of an embodiment of an optical adapter according to the present invention. 1 that are the same as those in FIG. 5 are assigned the same reference numerals.
図で、10は光アダプタである。光アダプタ10で、11は光
ファイバ７が接続されていてリピータ機能を有する光ア
ダプタ回路、12は通信信号を分岐して送る分岐回路であ
る。In the figure, 10 is an optical adapter. In the optical adapter 10, 11 is an optical adapter circuit to which the optical fiber 7 is connected and has a repeater function, and 12 is a branch circuit for branching and sending a communication signal.
13,141,142は分岐回路12に設けられた端子である。端子
13は支線３により分岐器と接続される。端子141,142は
支線３によりステーションが直接接続される。これらの
端子は、ステーションの送受信信号レベルと同等レベル
の信号を送受信することができる。13, 14 1 and 14 2 are terminals provided in the branch circuit 12. Terminal
13 is connected to the branching device by a branch line 3. The stations are directly connected to the terminals 14 1 and 14 2 by the branch line 3. These terminals can transmit and receive signals at the same level as the transmission and reception signal level of the station.
分岐回路12内では、光アダプタ回路11と端子13の間の経
路L1では通信信号の減衰量は小さく、光アダプタ回路11
と端子141,142の間の経路L2,L3では通信信号の減衰量は
大きい。In the branch circuit 12, the attenuation amount of the communication signal is small in the path L 1 between the optical adapter circuit 11 and the terminal 13, and the optical adapter circuit 11
The attenuation amount of the communication signal is large in the paths L 2 and L 3 between the terminal and the terminals 14 1 and 14 2 .
このような光アダプタの通常の使用例を第２図に示す。FIG. 2 shows a typical use example of such an optical adapter.
この場合は、端子13には支線３が接続され、その他端に
は分岐器４が接続される。また、端子141,142には終端
抵抗５が接続される。In this case, the branch line 3 is connected to the terminal 13 and the branching device 4 is connected to the other end. Further, the terminating resistor 5 is connected to the terminals 14 1 and 14 2 .
このような使用例では、光アダプタ回路11によって復調
された信号は、分岐回路12により少し減衰して端子13よ
りステーション２の送信信号レベルと同等レベルで送信
される。In such a usage example, the signal demodulated by the optical adapter circuit 11 is slightly attenuated by the branch circuit 12 and transmitted from the terminal 13 at the same level as the transmission signal level of the station 2.
逆に、端子13より入力した受信信号は、分岐回路12で少
し減衰して光アダプタ回路11に送られて復調される。On the contrary, the received signal input from the terminal 13 is slightly attenuated by the branch circuit 12 and sent to the optical adapter circuit 11 to be demodulated.
端子141と142は、終端抵抗５により信号の特性インピー
ダンスで終端しているが、終端抵抗を接続しなくても影
響は小さい。The terminals 14 1 and 14 2 are terminated with the characteristic impedance of the signal by the terminating resistor 5, but the influence is small even if the terminating resistor is not connected.
本考案により可能となった使用例を第３図に示す。An example of the use made possible by the present invention is shown in FIG.
この場合は、端子13には終端抵抗５が接続される。端子
141と142には支線３が接続され、その他端にはステーシ
ョン２が接続される。In this case, the terminal resistor 5 is connected to the terminal 13. Terminal
A branch line 3 is connected to 14 1 and 14 2 and a station 2 is connected to the other end.
このような使用例では、光アダプタ回路11により復調さ
れた信号は、分岐回路12によりかなり多く減衰し、ステ
ーション２の受信信号レベルと同等のレベルで送信され
る。In such a usage example, the signal demodulated by the optical adapter circuit 11 is considerably attenuated by the branch circuit 12, and is transmitted at a level equivalent to the reception signal level of the station 2.
逆に、端子141と142より入力された受信信号は、分岐回
路12によりかなり多く減衰してステーション２の受信信
号レベルと同等レベルで光アダプタ回路11へ送られて復
調される。Conversely, the received signal input from the terminal 14 1 and 14 2 is demodulated is sent to the optical adapter circuit 11 in quite a lot the received signal level of attenuation to the station 2 and the same level by the branch circuit 12.
この場合、端子13は必ず終端されていなければならず、
もし終端されていないと、分岐回路12内でインピーダン
スが不整合になって、伝送エラーが生じる。このような
ことは、経路L1が経路L2とL3に比べて信号の減衰量が少
ないことが原因となっている。In this case, terminal 13 must always be terminated,
If it is not terminated, the impedance will be mismatched in the branch circuit 12 and a transmission error will occur. This is because the path L 1 has less signal attenuation than the paths L 2 and L 3 .
経路L1とL2の信号の減衰量は、例えば分岐器２個分の分
岐損失に相当する。The attenuation amount of the signals on the paths L 1 and L 2 corresponds to, for example, the branch loss of two branch devices.
第４図は本考案にかかる光アダプタの他の実施例の構成
図である。FIG. 4 is a block diagram of another embodiment of the optical adapter according to the present invention.
この光アダプタでは、支線３と分岐回路12の接続状態を
切換えるセレクタ15が設けられている。This optical adapter is provided with a selector 15 that switches the connection state between the branch line 3 and the branch circuit 12.
このセレクタ15により、支線３に分岐器４が接続された
ときには端子16を端子13に接続し、支線３にステーショ
ン２が接続されたときには端子16を端子14（端子141と1
42と同じもの）に接続する。The selector 15 connects the terminal 16 to the terminal 13 when the branch line 4 is connected to the branch line 3 and connects the terminal 16 to the terminal 14 (terminals 14 1 and 1 when the station 2 is connected to the branch line 3).
4 same as 2 ).
＜効果＞ 本考案では、光アダプタに信号の減衰量が多い経路と少
ない経路を設け、光アダプタと送受信する信号のレベル
が高いときは減衰量が多い経路を用いて信号レベルが最
大許容値を越えないように抑制する構成になっている。
これによって、光アダプタに接続されるステーション数
が非常に少ない場合や、メインテナンスを行う場合等に
おいて、光アダプタに直接ステーションを接続するとき
に、信号を減衰させるために分岐器と幹線を特別に敷設
する必要がなくなるという効果が得られる。<Effect> According to the present invention, the optical adapter is provided with a route having a large amount of signal attenuation and a route having a small amount of signal attenuation, and when the level of the signal transmitted / received to / from the optical adapter is high, the route having a large amount of attenuation is used to obtain the maximum allowable signal level. It is designed to prevent it from being exceeded.
As a result, when the number of stations connected to the optical adapter is very small or when performing maintenance, etc., when connecting the stations directly to the optical adapter, specially installed branching devices and trunk lines to attenuate the signals. The effect that there is no need to do is obtained.
第１図は本考案の一実施例の構成を示した図、第２図お
よび第３図は第１図の光アダプタの使用例を示した図、
第４図は本考案の他の実施例を示した図、第５図は従来
における光アダプタの使用例を示した図である。 １…幹線、２…ステーション、３…支線、４…分岐器、
５…終端器、10…光アダプタ、11…光アダプタ回路、12
…分岐回路、13,141,142…端子、15…セレクタ。FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing examples of use of the optical adapter of FIG. 1,
FIG. 4 is a diagram showing another embodiment of the present invention, and FIG. 5 is a diagram showing an example of use of a conventional optical adapter. 1 ... Trunk line, 2 ... Station, 3 ... Branch line, 4 ... Branch device,
5 ... Terminator, 10 ... Optical adapter, 11 ... Optical adapter circuit, 12
… Branch circuit, 13,14 1 , 14 2 … Terminal, 15… Selector.
Claims (2)
と、このステーションを前記幹線に接続する支線と、こ
の支線を幹線に接続する際に接続部分のインピーダンス
の整合をとる分岐器と、前記ステーションと同様に支線
と分岐器を介して幹線に接続され通信信号を復調する光
アダプタと、光アダプタどうしを接続する光ファイバと
を有する通信システムにおいて、 光ファイバによって互いに接続され、通信信号を復調す
る光アダプタ回路と、 支線を介して前記分岐器と接続され、ステーションの送
受信信号と同レベルの信号が送受信可能な第１の端子
と、 支線を介して前記ステーションが直接接続され、ステー
ションの送受信信号と同レベルの信号が送受信可能な第
２の端子と、 減衰量の大きい経路と減衰量の小さい経路とを有し、前
記減衰量の大きい経路は前記光アダプタ回路と前記第２
の端子とを接続し、前記減衰量の小さい経路は光アダプ
タ回路と前記第１の端子とを接続する分岐回路と、 を具備し、前記第１の端子を経由してステーションと送
受信する低レベルの信号は前記減衰量の小さい経路で減
衰し、前記第２の端子を経由してステーションと送受信
する高レベルの信号は前記減衰量の大きい経路で減衰す
ることを特徴とする光アダプタ。1. A trunk line, a station having a communication function, a branch line connecting the station to the trunk line, a branching device for matching impedance of a connecting portion when the branch line is connected to the trunk line, and the station. Similarly, in a communication system including an optical adapter connected to a trunk line via a branch line and a branching device to demodulate a communication signal, and an optical fiber connecting the optical adapters to each other, an optical fiber connected to each other by an optical fiber to demodulate a communication signal A first terminal, which is connected to the branching device via a branch line and is capable of transmitting and receiving a signal of the same level as the transmission / reception signal of the station, and the station is directly connected via a branch line to the transmission / reception signal of the station. A second terminal capable of transmitting and receiving signals of the same level, a path with a large amount of attenuation and a path with a small amount of attenuation, The path with a large amount of attenuation is connected to the optical adapter circuit and the second
And a branch circuit connecting the optical adapter circuit and the first terminal to each other, and a path having a small amount of attenuation is connected to the terminal, and a low level for transmitting / receiving to / from the station via the first terminal. Is attenuated along the path with the smaller attenuation amount, and the high level signal transmitted to and received from the station via the second terminal is attenuated along the path with the larger attenuation amount.
子に選択的に接続するセレクタを具備したことを特徴と
する請求項（１）記載の光アダプタ。2. The optical adapter according to claim 1, further comprising a selector that selectively connects the branch line to the first terminal or the second terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989028222U JPH079467Y2 (en) | 1989-03-13 | 1989-03-13 | Optical adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989028222U JPH079467Y2 (en) | 1989-03-13 | 1989-03-13 | Optical adapter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02118342U JPH02118342U (en) | 1990-09-21 |
| JPH079467Y2 true JPH079467Y2 (en) | 1995-03-06 |
Family
ID=31251408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989028222U Expired - Lifetime JPH079467Y2 (en) | 1989-03-13 | 1989-03-13 | Optical adapter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH079467Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077010C (en) * | 1997-05-13 | 2002-01-02 | 杜邦-Mrc株式会社 | Wood-like molding, process for preparing same, and composition for molding |
-
1989
- 1989-03-13 JP JP1989028222U patent/JPH079467Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077010C (en) * | 1997-05-13 | 2002-01-02 | 杜邦-Mrc株式会社 | Wood-like molding, process for preparing same, and composition for molding |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02118342U (en) | 1990-09-21 |
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