JPH077459A - Line switching circuit - Google Patents
Line switching circuitInfo
- Publication number
- JPH077459A JPH077459A JP14732693A JP14732693A JPH077459A JP H077459 A JPH077459 A JP H077459A JP 14732693 A JP14732693 A JP 14732693A JP 14732693 A JP14732693 A JP 14732693A JP H077459 A JPH077459 A JP H077459A
- Authority
- JP
- Japan
- Prior art keywords
- switching
- delay
- output
- receiver
- line
- 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
Links
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は回線切替え回路に関し、
特にマイクロ波無線通信回線の切替え回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching circuit,
In particular, it relates to a switching circuit for a microwave wireless communication line.
【０００２】[0002]
【従来の技術】マイクロ波無線通信回線の従来の回線切
替え回路は、図４に示すように切替え部４から成り、切
替え制御信号により、第１受信機または第２受信機の出
力信号を選択し出力していた。2. Description of the Related Art A conventional line switching circuit for a microwave radio communication line comprises a switching unit 4 as shown in FIG. 4, and selects an output signal of a first receiver or a second receiver by a switching control signal. It was outputting.
【０００３】[0003]
【発明が解決しようとする課題】この従来の回線切替え
回路は、信頼度上の問題からその切替え部４に水銀リレ
ーを用いることが多かった。しかし、デジタル無線通信
方式が広く採用される今日、ヒットレス切替えのため、
この回線切替え回路の手前にヒットレス回線切替え回路
が挿入され、フェージングに起因する回線切替えは全て
このヒットレス回線切替え回路にてなされるようになっ
た。従って、従来の回線切替え回路は主としてヒットレ
ス切替え回路等が故障した際の機器故障救済用として使
用されるようになった。その結果、この従来の回線切替
え回路は、通常運用時にはほとんど切替え動作が行われ
なくなり、水銀リレー特有のソフトスティック現象（接
点が長時間つながったままだと接点が離れにくくなり、
リレー駆動電流を流してもリレーが切替わらなくなる現
象）が発生することが散見されるようになってきた。In this conventional line switching circuit, a mercury relay is often used as the switching unit 4 due to reliability problems. However, due to the hitless switching, the digital wireless communication system is widely adopted today.
A hitless line switching circuit is inserted in front of this line switching circuit, and all line switching caused by fading is performed by this hitless line switching circuit. Therefore, the conventional line switching circuit has come to be mainly used for equipment failure relief when the hitless switching circuit or the like fails. As a result, this conventional line switching circuit almost does not perform switching operation during normal operation, and the soft stick phenomenon peculiar to mercury relays (contacts become difficult to separate if they remain connected for a long time,
It is becoming more and more common that the relay does not switch even if a relay drive current is applied.
【０００４】このような時、回線は障害状態となるが、
切替え回路からは一切アラーム情報が発せられないた
め、原因追及に手間取り、回線復旧までに長い時間がか
かる、という問題があった。At such a time, the line is in a failure state,
Since no alarm information is issued from the switching circuit, there is a problem that it takes time to find the cause and it takes a long time to restore the line.
【０００５】本発明の目的は、このような問題点を解決
した回線切替え回路を提供することにある。An object of the present invention is to provide a line switching circuit which solves such a problem.
【０００６】[0006]
【課題を解決するための手段】本発明の回線切替え回路
は、一方の受信機の出力が入力される遅延手段と、この
遅延手段の出力と他方の受信機の出力とを選択し、いず
れか一方を出力する切替え手段と、前記一方の受信機の
出力信号レベルを検出する手段と、このレベル検出手段
の出力と前記切替え手段の切替え制御信号とから切替え
部の故障を判定し、アラーム信号を出力する判定手段
と、を備えることを特徴とする。A line switching circuit of the present invention selects a delay means to which an output of one receiver is input, an output of this delay means and an output of the other receiver, and selects one of them. A switching unit that outputs one, a unit that detects the output signal level of the one receiver, a failure of the switching unit is determined from the output of the level detection unit and the switching control signal of the switching unit, and an alarm signal is output. And a determining means for outputting.
【０００７】[0007]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Embodiments of the present invention will now be described with reference to the drawings.
【０００８】図１は本発明の一実施例のブロック図であ
る。この回線切替え回路は、第１受信機と第２受信機と
を切替える切替え部４と、入力部に信号入力レベルを検
出するレベル検出部２と、入力された信号に一定の遅延
を与え切替え部４に入力するための遅延部１と、レベル
検出部２の出力と切替え制御信号とから切替え部４の故
障を判定する判定部３とを備えている。FIG. 1 is a block diagram of an embodiment of the present invention. This line switching circuit includes a switching unit 4 that switches between a first receiver and a second receiver, a level detection unit 2 that detects a signal input level at an input unit, and a switching unit that gives a constant delay to an input signal. 4 is provided with a delay unit 1 for inputting to the switch 4, and a determination unit 3 for determining a failure of the switching unit 4 from the output of the level detection unit 2 and the switching control signal.
【０００９】次に、本実施例の動作を説明する。Next, the operation of this embodiment will be described.
【００１０】第１受信機の出力は、遅延部１を通り切替
え部４に入力される。一方、レベル検出部２は高入力イ
ンピーダンスの検波回路であり、第１受信機からの入力
信号の振幅を監視しており、その振幅がある一定値を超
えたか否かを判定部３に出力している。The output of the first receiver passes through the delay unit 1 and is input to the switching unit 4. On the other hand, the level detection unit 2 is a high input impedance detection circuit, monitors the amplitude of the input signal from the first receiver, and outputs to the determination unit 3 whether the amplitude exceeds a certain value. ing.
【００１１】ここで、遅延部１の電気長を、第１受信機
出力信号の最もパワーが集中している周波数の１／４波
長になるように選んでおくと、切替え部４の導通（第１
受信機側選択）時には通常の遅延線として働くが、切替
え部４の非導通（第２受信機側選択時）時には切替え部
４側が腹、レベル検出部２側は節の共振器として動作す
ることとなる。Here, if the electrical length of the delay unit 1 is selected to be ¼ wavelength of the frequency at which the power of the first receiver output signal is most concentrated, conduction of the switching unit 4 (first 1
When the receiver side is selected), it works as a normal delay line, but when the switching part 4 is non-conductive (when the second receiver side is selected), the switching part 4 side operates as an antinode, and the level detection part 2 side operates as a node resonator. Becomes
【００１２】したがって、レベル検出部２の入力は、切
替え部４が第２受信機側を選択した時には第１受信機側
を選択した時と比較し、その入力振幅が大きく変化する
ため、この振幅を検出することにより、切替え部４が第
１受信機と第２受信機側のどちらを選択しているかを状
態信号として出力することができる。Therefore, since the input amplitude of the level detection section 2 changes greatly when the switching section 4 selects the second receiver side as compared with when the switching section 4 selects the first receiver side, this amplitude is changed. By detecting the, it is possible to output as a status signal which one of the first receiver and the second receiver the switching unit 4 selects.
【００１３】このことから、レベル検出部２の出力と切
替え制御信号とを比較することにより、判定部３は切替
え部４が正常に動作しているか否かを判定でき、異常な
時（故障時）にはアラーム信号を出力することができ
る。From this, by comparing the output of the level detecting section 2 with the switching control signal, the judging section 3 can judge whether or not the switching section 4 is operating normally, and when there is an abnormality (at the time of failure). ) Can output an alarm signal.
【００１４】図２は、本発明の他の実施例を示す図であ
る。この回線切替え回路は、図１の回線切替え回路の第
２受信機と切替え部４との間に遅延部５を設け、第１受
信機の出力信号と第２受信機の出力信号とを遅延時間を
一致させることで切替え部４の入力にて位相関係を一致
させ、メンテナンス時にこの切替え部４を切替えた時に
回線瞬断を起こしにくくした例である。FIG. 2 is a diagram showing another embodiment of the present invention. In this line switching circuit, a delay unit 5 is provided between the second receiver and the switching unit 4 of the line switching circuit of FIG. 1 to delay the output signal of the first receiver and the output signal of the second receiver by a delay time. This is an example in which the phase relations are matched by the input of the switching unit 4 by making them coincident with each other, and the line interruption is less likely to occur when the switching unit 4 is switched during maintenance.
【００１５】図３は、本発明のさらに他の実施例を示す
図である。この実施例は、回線切替え回路を１＋Ｎ予備
方式に用いた例である。各現用部分に回線切替え回路が
実装されている。切替え部４−１は、予備系受信機と第
１現用系受信機とを切替え、一般に切替え部４−ｉ（２
≦ｉ≦Ｎの整数）は、第（ｉ−１）現用系受信機と第ｉ
現用系受信機とを切替える。FIG. 3 is a diagram showing still another embodiment of the present invention. This embodiment is an example in which the line switching circuit is used in the 1 + N standby system. A line switching circuit is mounted on each working part. The switching unit 4-1 switches between the standby system receiver and the first working system receiver, and generally, the switching unit 4-i (2
≤ i ≤ N) is the (i-1) th working receiver and the i-th
Switch to the active receiver.
【００１６】[0016]
【発明の効果】以上説明したように本発明は、回線切替
え回路の切替え手段が導通状態になっているか非導通状
態になっているかを、遅延手段の共振特性を利用するこ
とにより検出することが可能となっている。従って、こ
の検出結果と切替制御信号とを比較することにより、切
替え手段が正常な動作をしているか否かを検出すること
ができる。このことから切替え手段が故障した場合や、
水銀リレーのソフトスティック現象が発生してもアラー
ム信号が出力されるため、不具合箇所の迅速な特定がで
き、回線復旧までの所要時間を大幅に短縮できるという
効果を有する。As described above, the present invention can detect whether the switching means of the line switching circuit is in the conducting state or the non-conducting state by utilizing the resonance characteristic of the delay means. It is possible. Therefore, by comparing the detection result with the switching control signal, it is possible to detect whether the switching unit is operating normally. From this, if the switching means fails,
Since an alarm signal is output even if the soft stick phenomenon of the mercury relay occurs, it is possible to quickly identify the defective portion and significantly reduce the time required to restore the line.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図２】本発明を応用した一実施例のブロック図であ
る。FIG. 2 is a block diagram of an embodiment to which the present invention is applied.
【図３】本発明を１＋Ｎ予備方式に応用した一実施例の
ブロック図である。FIG. 3 is a block diagram of an embodiment in which the present invention is applied to a 1 + N standby system.
【図４】従来例のブロック図である。FIG. 4 is a block diagram of a conventional example.
１ 遅延部 ２ レベル検出部 ３ 判定部 ４ 切替え部 ５ 遅延部 1 delay unit 2 level detection unit 3 determination unit 4 switching unit 5 delay unit
Claims (3)
と、 この遅延手段の出力と他方の受信機の出力とを選択し、
いずれか一方を出力する切替え手段と、 前記一方の受信機の出力信号レベルを検出する手段と、 このレベル検出手段の出力と前記切替え手段の切替え制
御信号とから切替え部の故障を判定し、アラーム信号を
出力する判定手段と、 を備えることを特徴とする回線切替え回路。1. A delay means to which the output of one receiver is input, and an output of this delay means and an output of the other receiver are selected,
A switching means for outputting either one, a means for detecting the output signal level of the one receiver, and a failure of the switching portion based on the output of the level detection means and the switching control signal of the switching means, and an alarm A line switching circuit comprising: a determining unit that outputs a signal.
になった時に、共振状態となることを特徴とする請求項
１記載の回線切替え回路。2. The line switching circuit according to claim 1, wherein the delay means is in a resonance state when the switching section is in an open state.
延手段と、 他方の受信機の出力が入力される第２の遅延手段と、 前記第１の遅延手段の出力と前記第２の遅延手段の出力
とを選択し、いずれか一方を出力する切替え手段と、 前記一方の受信機の出力信号レベルを検出する手段と、 このレベル検出手段の出力と前記切替え手段の切替え制
御信号とから切替え部の故障を判定し、アラーム信号を
出力する判定手段とを備え、 前記第１の遅延手段は、前記切替え部が開放状態になっ
た時に、共振状態となるものであり、前記第１の遅延手
段の遅延時間と前記第２の遅延手段の遅延時間は等しく
なるように選定されていることを特徴とする回線切替え
回路。3. A first delay means to which an output of one receiver is input, a second delay means to which an output of the other receiver is input, an output of the first delay means and the first delay means. Switching means for selecting the output of the second delay means and outputting one of them, means for detecting the output signal level of the one receiver, output of the level detecting means and switching control signal of the switching means And a determination unit that determines a failure of the switching unit and outputs an alarm signal, wherein the first delay unit is in a resonance state when the switching unit is in an open state. A line switching circuit, wherein the delay time of the first delay means and the delay time of the second delay means are selected to be equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5147326A JPH0817340B2 (en) | 1993-06-18 | 1993-06-18 | Circuit switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5147326A JPH0817340B2 (en) | 1993-06-18 | 1993-06-18 | Circuit switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH077459A true JPH077459A (en) | 1995-01-10 |
| JPH0817340B2 JPH0817340B2 (en) | 1996-02-21 |
Family
ID=15427659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5147326A Expired - Lifetime JPH0817340B2 (en) | 1993-06-18 | 1993-06-18 | Circuit switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0817340B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03259636A (en) * | 1990-03-09 | 1991-11-19 | Fujitsu Ltd | Detection/changeover system at time of occurrence of fault of transmitter |
-
1993
- 1993-06-18 JP JP5147326A patent/JPH0817340B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03259636A (en) * | 1990-03-09 | 1991-11-19 | Fujitsu Ltd | Detection/changeover system at time of occurrence of fault of transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0817340B2 (en) | 1996-02-21 |
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