JP2864847B2 - Line switching system - Google Patents
Line switching systemInfo
- Publication number
- JP2864847B2 JP2864847B2 JP4040761A JP4076192A JP2864847B2 JP 2864847 B2 JP2864847 B2 JP 2864847B2 JP 4040761 A JP4040761 A JP 4040761A JP 4076192 A JP4076192 A JP 4076192A JP 2864847 B2 JP2864847 B2 JP 2864847B2
- Authority
- JP
- Japan
- Prior art keywords
- line
- switching
- working
- signal
- switching control
- 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
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は無線ディジタル伝送にお
ける回線切替システムに関し、特に無瞬断回線切替シス
テムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line switching system in wireless digital transmission, and more particularly to a line switching system without instantaneous interruption.
【０００２】[0002]
【従来の技術】図２は従来の回線切替システムの構成例
である。ここでは現用回線２、予備回線１の２＋１シス
テム構成としている。送端切替回路１０１−１は、イン
ターフェイス信号１１−１と、送端切替回路１０１−２
の出力信号１３−２とを入力し、現用１への出力端子に
は、常にインターフェイス信号１１−１と同一信号１２
−１を出力し、もう一方の出力端子には、送端切替制御
信号１５−１がない場合には現用２からの入力信号１３
−２を、制御信号１５−１がある場合にはインターフェ
イス信号１１−１を、予備への出力信号１３−１として
出力する。送端切替回路１０１−２は、現用３からの入
力信号がないだけで、送端切替回路１０１−１と動作は
同様である。2. Description of the Related Art FIG. 2 shows a configuration example of a conventional line switching system. Here, the working line 2 and the protection line 1 have a 2 + 1 system configuration. The transmitting end switching circuit 101-1 includes an interface signal 11-1 and a transmitting end switching circuit 101-2.
And the output terminal to the working 1 is always connected to the same signal 12-1 as the interface signal 11-1.
-1 and the other output terminal receives the input signal 13 from the working 2 when there is no sending end switching control signal 15-1.
-2, and outputs the interface signal 11-1 as the output signal 13-1 to the spare when there is the control signal 15-1. The operation of the sending end switching circuit 101-2 is the same as that of the sending end switching circuit 101-1, except that there is no input signal from the active 3.
【０００３】変調回路１０２−０〜１０２−２は、各々
の入力信号１３−１，１２−１，１２−２に対して無線
伝送に必要なディジタル信号処理とともに変調信号に変
換し、変調信号１４−０〜１４−２を出力する。変調信
号１４−０〜１４−２は無線周波数に変換し、送出され
る（図示せず）。復調回路２０４−０〜２０４−２は各
々の入力信号２１−０〜２１−２を復調し、第１の回線
品質劣化警報２３−０〜２３−２、及び第２の回線品質
劣化警報２４−０〜２４−２を出力し、送信側でのディ
ジタル信号処理の逆変換を行い、出力信号２２−０〜２
２−２を得る。無瞬断切替回路２０２−１，２０２−２
は現用回線を伝送されてきた信号２２−１，２２−２
と、予備回線を伝送されてきた信号２２−０とを出力
し、受端切替制御信号２５−１，２５−２に基づき現用
・予備間の切替を無瞬断で行う。[0003] Modulation circuits 102-0 to 102-2 convert input signals 13-1, 12-1 and 12-2 into modulated signals together with digital signal processing required for wireless transmission, and modulate modulated signals 14-1 to 12-2. -0 to 14-2 are output. Modulated signals 14-0 to 14-2 are converted to radio frequencies and transmitted (not shown). The demodulation circuits 204-0 to 204-2 demodulate the respective input signals 21-0 to 21-2, and output a first line quality deterioration alarm 23-0 to 23-2 and a second line quality deterioration alarm 24-. 0 to 24-2, perform inverse conversion of digital signal processing on the transmission side, and output signals 22-0 to 22-2.
2-2 is obtained. Instantaneous interruption switching circuits 202-1 and 202-2
Are the signals 22-1 and 22-2 transmitted on the working line.
And the signal 22-0 transmitted on the protection line, and the switching between the working and protection is performed without an instantaneous interruption based on the receiving-end switching control signals 25-1 and 25-2.
【０００４】送端切替制御回路１０３、及び受端切替制
御回路２０５は各々の間で制御情報信号１６，２６の授
受を行うとともに、前記第１及び第２の回線品質劣化警
報２３−０〜２３−２，２４−０〜２４−２に基づき切
替制御を行う。従来、第１の回線品質劣化警報は、フレ
ーム同期外れ或いはビット誤り率が10-3より劣化した場
合に発動し、第２の回線品質劣化警報はビット誤り率が
10-7〜10-5程度で発動としていた。The transmitting end switching control circuit 103 and the receiving end switching control circuit 205 transmit and receive control information signals 16 and 26 between them, and also perform the first and second line quality deterioration alarms 23-0 to 23. Switching control is performed based on -2, 24-0 to 24-2. Conventionally, the first line quality deterioration alarm is activated when the frame synchronization is lost or the bit error rate is deteriorated below 10 -3 , and the second line quality deterioration alarm is generated when the bit error rate is low.
It was activated at around 10 -7 to 10 -5 .
【０００５】[0005]
【発明が解決しようとする課題】この従来の回線切替シ
ステムでは、回線切替の開始がビット誤り率10-7〜10-5
付近のため、無瞬断、即ちビット誤りなしで切替を行っ
ているが、切替前のビット誤りのために回線品質が悪く
なるという問題を有している。又、回線品質劣化警報の
発動を単にビット誤り率が良い領域に設定した場合、例
えばビット誤り率が10-10 程度の場合、現用１がビット
誤り率10-8、その後現用２がビット誤り率10-5となった
ときに、現用２は次のレベルの警報（ビット誤り率が10
-3を越える）が発動されない限り救済されないという問
題を有している。本発明の目的は、回線品質の向上を図
った回線切替システムを提供することにある。In this conventional line switching system, the start of line switching is performed with a bit error rate of 10 -7 to 10 -5.
Switching is performed without a momentary interruption, that is, without any bit error because of the vicinity, but there is a problem that the line quality deteriorates due to the bit error before switching. If the activation of the line quality degradation alarm is simply set in a region where the bit error rate is good, for example, when the bit error rate is about 10 -10 , the working 1 has a bit error rate of 10 -8 , and then the working 2 has a bit error rate of When 10 -5 is reached, the working 2 alerts the next level (the bit error rate is 10
(Exceeding -3 ) cannot be rescued unless activated. An object of the present invention is to provide a line switching system that improves line quality.
【０００６】[0006]
【課題を解決するための手段】本発明は、受信側に、現
用、予備を含む各回線のそれぞれにおけるＬ（≧３）個
の異なる回線品質を検出する手段と、受端切替制御信号
に基づき、現用回線を伝送されてきた信号と予備回線を
伝送されてきた信号とを無瞬断で切り替える手段と、前
記Ｌ個の異なる回線品質検出結果に優先順位を持たせ、
切替制御を行う手段とを備える。Means for Solving the Problems The present invention, on the receiving side, the current
Means for detecting L (≧ 3) different line qualities in each of the lines including the service line and the protection line, and the signal transmitted on the working line and the protection line based on the receiving end switching control signal. Means for instantaneously switching between signals and a signal, and giving priority to the L different line quality detection results,
Means for performing switching control.
【０００７】[0007]
【作用】現用、予備を含む各回線のそれぞれにおいて、
３個以上の異なる回線品質検出手段で検出された回線品
質劣化警報により切替制御を行うことで、回線品質を向
上する。In each of the lines including the working and the protection,
Switching quality is improved by performing switching control based on line quality deterioration alarms detected by three or more different line quality detecting units.
【０００８】[0008]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の一実施例の回線切替システムのブロ
ック図である。本実施例では図２に示した従来例と同様
に、現用２、予備１の場合（Ｌ＝３）を示している。送
信側の送端切替回路１０１−１，１０１−２、変調回路
１０２−０〜１０２−２、及び送端切替制御回路１０３
の動作は従来例と同じなので省略する。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a line switching system according to an embodiment of the present invention. In this embodiment, as in the conventional example shown in FIG. 2, the case of working 2 and backup 1 (L = 3) is shown. Transmission-end switching circuits 101-1 and 101-2 on the transmission side, modulation circuits 102-0 to 102-2, and transmission-end switching control circuit 103
The operation of is the same as that of the conventional example, and will not be described.
【０００９】一方、受端側の復調回路２０１−０〜２０
１−２は各々の入力信号２１−０〜２１−２を復調し、
第１の回線品質劣化警報２３−０〜２３−２、第２の回
線品質劣化警報２４−０〜２４−２、及び第３の回線品
質劣化警報２７−０〜２７−２を出力し、送信側でのデ
ィジタル信号処理の逆変換を行い、出力信号２２−０〜
２２−２を得る。又、無瞬断切替回路２０１−１，２０
１−２は従来例と同じなので説明を省略する。On the other hand, demodulation circuits 201-0 to 20-20 on the receiving end side
1-2 demodulates each of the input signals 21-0 to 21-2,
The first line quality deterioration alarms 23-0 to 23-2, the second line quality deterioration alarms 24-0 to 24-2, and the third line quality deterioration alarms 27-0 to 27-2 are output and transmitted. Performs the reverse conversion of the digital signal processing on the output side, and outputs signals 22-0 to 22-0.
22-2 is obtained. In addition, the instantaneous interruption switching circuits 201-1 and 20-1
Since 1-2 is the same as the conventional example, the description is omitted.
【００１０】受端切替制御回路２０３は、第１、第２及
び第３の回線品質劣化警報２３−０〜２３−２，２４−
０〜２４−２，２７−０〜２７−２に基づき切替制御を
行う。第１，第２の回線品質劣化警報は従来例と同じ
で、例えば第３の回線品質劣化警報としてビット誤り率
10-11 〜10-9程度とする。回線切替はビット誤り率が10
-11 〜10-9で行われ、回線品質は従来よりも改善され
る。The receiving end switching control circuit 203 includes first, second, and third line quality deterioration alarms 23-0 to 23-2, 24-
Switching control is performed based on 0-24-2 and 27-0 to 27-2. The first and second line quality deterioration alarms are the same as those in the conventional example.
It should be about 10 -11 to 10 -9 . Line switching has a bit error rate of 10
-11 to 10 -9 , and the line quality is improved compared to the past.
【００１１】[0011]
【発明の効果】以上説明したように本発明は、現用、予
備を含む各回線のそれぞれにおけるＬ個（Ｌ≧３）の異
なる回線品質劣化警報を有する構成としたので、従来例
よりビット誤り率の良い領域での切替が可能となり、回
線品質の向上が計れるとともに複数の現用回線で品質劣
化が発生しても、従来よりも現用回線の回線品質を良い
状態に保てるという効果がある。As described above, the present invention can be applied to current use,
Since L (L ≧ 3) different line quality deterioration alarms are provided for each of the lines including the provisions, switching can be performed in a region having a higher bit error rate than in the conventional example, and the line quality can be improved. In addition, even if quality degradation occurs in a plurality of working lines , there is an effect that the line quality of the working line can be kept better than in the past.
【図１】本発明の回線切替システムの一実施例のブロッ
ク図である。FIG. 1 is a block diagram of an embodiment of a line switching system according to the present invention.
【図２】従来の回線切替システムの一例のブロック図で
ある。FIG. 2 is a block diagram of an example of a conventional line switching system.
１０１ 送端切替回路 １０２ 変調回路 １０３ 送端切替制御回路 ２０１ 復調回路 ２０２ 無瞬断切替回路 ２０３ 受端切替制御回路 DESCRIPTION OF SYMBOLS 101 Sending end switching circuit 102 Modulation circuit 103 Sending end switching control circuit 201 Demodulation circuit 202 Non-instantaneous interruption switching circuit 203 Receiving end switching control circuit
Claims (1)
用回線に対してＭ（Ｎ≧Ｍ≧１）個の予備回線が設けら
れている回線切替システムにおいて、送信側には、送端
切替制御信号に基づき現用回線と同一信号を予備回線に
分岐する手段と、受信側には、前記各回線のそれぞれに
おけるＬ（≧３）個の異なる回線品質を検出する手段
と、受端切替制御信号に基づき、現用回線を伝送されて
きた信号と予備回線を伝送されてきた信号とを無瞬断で
切り替える手段と、前記Ｌ個の異なる回線品質検出結果
に優先順位を持たせ、切替制御を行う手段とを備えるこ
とを特徴とする回線切替システム。In a line switching system in which M (N ≧ M ≧ 1) protection lines are provided for N (≧ 1) working lines of wireless digital transmission, a transmitting end is means for branching the working line and the same signal on the basis of a switching control signal to the protection line, on the receiving side, the each of the lines
Definitive L (≧ 3) and means for detecting the number of different channel quality, based on the receiving end switching control signal, means for switching without instantaneous interruption of the signal transmitted over the signal and the protection line which has been transmitted to the working line And a means for giving priority to the L different line quality detection results and performing switching control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4040761A JP2864847B2 (en) | 1992-01-31 | 1992-01-31 | Line switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4040761A JP2864847B2 (en) | 1992-01-31 | 1992-01-31 | Line switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05219028A JPH05219028A (en) | 1993-08-27 |
| JP2864847B2 true JP2864847B2 (en) | 1999-03-08 |
Family
ID=12589609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4040761A Expired - Lifetime JP2864847B2 (en) | 1992-01-31 | 1992-01-31 | Line switching system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2864847B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0787446B2 (en) * | 1989-01-18 | 1995-09-20 | 日本電気株式会社 | Digital signal transmission system |
-
1992
- 1992-01-31 JP JP4040761A patent/JP2864847B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05219028A (en) | 1993-08-27 |
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