JPH0334638A - Circuit switching method - Google Patents
Circuit switching methodInfo
- Publication number
- JPH0334638A JPH0334638A JP16675489A JP16675489A JPH0334638A JP H0334638 A JPH0334638 A JP H0334638A JP 16675489 A JP16675489 A JP 16675489A JP 16675489 A JP16675489 A JP 16675489A JP H0334638 A JPH0334638 A JP H0334638A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switching
- signal
- scramble
- synchronization
- 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
Links
- 238000000034 method Methods 0.000 title claims description 8
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
Abstract
Description
［産業上の利用分野］
本発明は、無線区間の信号が付加されていない信号列を
現用回線と予備回線との間で無瞬断受信同期切替えする
回線切替え方法に関する。
［従来の技術］
ディジタル無線通信においては、現用回線に障害が発生
した場合あるいは機器の保守点検を行なう場合等に、該
当する現用回線・を予備回線に切替えるための回線切替
え装置が用いられている。
第２図は、従来の回線切替え装置の回路ブロック図であ
り、現用回線１００と予備回線２００には同一の回路が
設けられる。すなわち、送信系の分岐回路１には送信符
号変換回路２，２ａ、送信信号処理回路３，３ａが設け
られ、受信系ではフレーム同期回路４，４ａ、受信信号
処理回路５゜５ａ、受信符号変換回路６．６ａが設けら
れている。また、予備回線２００には現用口＆！１００
を救済する際に予備回線２００に送出された信号を現用
口＠ｉｏｏに分配する分配回路７が、現用回線１００に
は上記分配回路７からの信号を現用回線１００に入力す
る同期切替え回路８が設けられている。そして、回線切
替えに際しては、同期切替え回路８により伝送路上の情
報信号列の受信同期切替えを行なっていた。
また、予備回線２００の障害発生を監視するために、送
信側にパイロット発生回路９．受信側にパイロ−、ト検
出回路ｌＯが設けられると共に、現用回線１００に出力
される信号とパイロット発生回路９の出力信号を切り替
える送信側切替え器１１、受信符号変換回路６．６ａか
ら出力される予備回線側信号と現用回線信号とを切り替
える受信側切替え器１２が設けられている。
この構成により、現用回線１００が選択されているとき
、予備回［２００ではパイロット発生回路９から出力さ
れたパイロット信号が送信側切替え器１１、送信符号変
換回路２ａ、送信処理回路３ａ、フレーム同期回路４ａ
、受信信号処理回路５ａ、分配回路７および受信側切替
え器１２に順次送給されて、最終的にパイロット検出回
路１０に入力される。したがって、このパイロット信号
の検出により、予備回線の障害を検出して回線品質を監
視できる。
［解決すべき課題］
上述した従来の回線切替装置は、オール１やオールＯが
長時間続くような変化の少ない軽負荷信号列の場合、現
用回線側の主信号列と予備回線側の主信号列との間の位
相差を正確に検出できなくなるおそれを有していた。そ
のため、位相差があるにもかかわらず現用回線側主信号
列と予備回線側主信号列の位相差なしと誤って判断し、
切替時に瞬断を生ずることがあった。また、固定パター
ン信号列においても、受信同期切替回路内で分周するた
め変化点がなくなり、同様に切替時の瞬断を生ずること
があった。
本発明はこのような問題を解決するためになされたもの
で、オール１やオール０が長時間続くような変化の少な
い軽負荷信号列や固定パターンの信号列の場合等にも確
実に同期をとり、無瞬断切替えを実現することのできる
回線切替え方法の提供を目的とする。[Industrial Field of Application] The present invention relates to a line switching method for seamlessly receiving and synchronously switching a signal string to which no signal in a wireless section is added between a working line and a protection line. [Prior Art] In digital wireless communications, a line switching device is used to switch the current line to a backup line when a failure occurs in the current line or when equipment is being inspected or maintained. . FIG. 2 is a circuit block diagram of a conventional line switching device, in which the working line 100 and the protection line 200 are provided with the same circuit. That is, the transmission system branch circuit 1 is provided with transmission code conversion circuits 2, 2a, transmission signal processing circuits 3, 3a, and the reception system is provided with frame synchronization circuits 4, 4a, reception signal processing circuit 5.5a, and reception code conversion circuits. A circuit 6.6a is provided. In addition, the backup line 200 has a working port &! 100
There is a distribution circuit 7 that distributes the signal sent to the protection line 200 to the working port @ioo when relieving the protection line 100, and a synchronous switching circuit 8 that inputs the signal from the distribution circuit 7 to the working line 100. It is provided. When switching lines, the synchronization switching circuit 8 switches the reception synchronization of the information signal sequence on the transmission path. In addition, in order to monitor the occurrence of a failure in the protection line 200, a pilot generation circuit 9. A pilot and pilot detection circuit 10 is provided on the receiving side, and the signal outputted from the transmitting side switch 11 that switches between the signal output to the working line 100 and the output signal of the pilot generating circuit 9, and the reception code conversion circuit 6.6a. A receiving side switch 12 is provided for switching between a protection line side signal and a working line signal. With this configuration, when the working line 100 is selected, in the protection line [200, the pilot signal output from the pilot generation circuit 9 is transmitted to the transmission side switching unit 11, the transmission code conversion circuit 2a, the transmission processing circuit 3a, and the frame synchronization circuit. 4a
, the received signal processing circuit 5a, the distribution circuit 7, and the receiving side switching device 12, and finally input to the pilot detection circuit 10. Therefore, by detecting this pilot signal, failures in the protection line can be detected and line quality can be monitored. [Problems to be Solved] In the case of a light load signal train with little change such as all 1's or all O's continuing for a long time, the conventional line switching device described above cannot switch between the main signal train on the working line side and the main signal on the protection line side. There was a risk that the phase difference between the two columns could not be accurately detected. Therefore, even though there is a phase difference, it is mistakenly determined that there is no phase difference between the main signal train on the working line side and the main signal train on the protection line side.
Momentary interruptions sometimes occurred during switching. Furthermore, since the fixed pattern signal train is frequency-divided within the reception synchronization switching circuit, there are no changing points, which may similarly cause instantaneous interruptions during switching. The present invention was made to solve this problem, and it is possible to reliably synchronize even in the case of a light load signal train with little change such as all 1s or all 0s for a long time, or a fixed pattern signal train. The purpose of the present invention is to provide a line switching method that can realize uninterrupted switching.
上記目的を達成するために、本発明は、無線区間の信号
が付加されていない信号列を現用回線と予備回線との間
で無瞬断受信同期切替えする回線切替え方法であって、
受信信号処理回路から出力された現用回線側の主信号列
と、予備回線側の主信号列とを、切替前にスクランブル
回路によりスクランブルさせ、かつ受信同期後にデスク
ランブル回路によりデスクランブルさせる方法としであ
る。
［実施例］
以下、本発明の一実施例について図面を参照して説明す
る。
第１図は、本発明の方法を実施するための回線切替え装
置を示すブロック構成図である。なお。
先に示した第２図と同一部分には同一符号を付し、その
部分の詳細な説明は省く。
第１図に示した回線切替え装置において特徴的なことは
、現用回線１００側の受信系の信号路および予備回線２
００の受信系を分配した信号路、すなわち同期切替回路
８に入る前の信号路に、入力信号の周波数帯を変化させ
るスクランブル回路１３．１３ａを設けるとともに、同
期切替回路８の出力側信号路中にデスクスクランブル回
路１４を設け、スクランブル回路１３．１３ａで変化を
加えた信号周波数をもとに戻すように構成したことであ
る。
ここで、現用回線１００側のスクランブル回路１３から
予備回線２００側のスクランブル回路１３ａへはタイミ
ング信号（例えば、電源ＯＮ信号）１５が出力され、こ
のタイミング信号１５により各スクランブル回路１３，
１３ａの初期値を同時に合わせるようになっている。ま
た、各スクランブル回路１３，１３ａには、１．Ｏ変換
点検出力回路１６，１．６ａが併設されており、同回路
１６．１６ａが現用回線１００側と予備回線２００側と
で同じ位相を検出した場合に、その検出点から各スクラ
ンブル回路１３，１３ａがスクランブルをかけるように
なっている。
上述した回線切替え装置を用いることにより、本発明の
回線切替え方法は次のようにして行なうことができる。
すなわち、現用回線１００を予備回線２００へ切替える
に際して、現用回線１００側と予備回線２００側とで初
期値が同じであるか、または１゜Ｏ変換点検回路１６．
１６ａにより両回線で同じ位相を検出した場合には、ス
クランブル回路１３．１３ａにより同期切替前の時点で
両回線の信号列にスクランブルをかける。このスクラン
ブル動作により主信号列に変化をもたせることができる
ので１本体オール１やオールＯが長時間続くような変化
の少ない軽負荷信号列であっても、同期切替え回路８で
確実に位相同期をとることができる。その後、同期切替
え回路８から出力された信号列に対してデスクランブル
回路１４によりデスクランブルをかけ、スクランブル前
の信号状態に戻す。
［発明の効果］
以上説明したように、本発明によれば、オール１やオー
ルＯが長時間続くような軽負荷信号列や固定パターンの
信号列の場合等にも確実に同期をとり、無瞬断切替えを
実現できるという効果がある。In order to achieve the above object, the present invention provides a line switching method for seamlessly receiving and synchronously switching a signal string to which no signal in a wireless section is added between a working line and a protection line, comprising:
A method is to use a scrambling circuit to scramble the main signal train on the working line side and the main signal train on the protection line side output from the reception signal processing circuit using a scrambling circuit before switching, and to descramble them using a descrambling circuit after receiving synchronization. be. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a line switching device for implementing the method of the present invention. In addition. The same parts as in FIG. 2 shown above are given the same reference numerals, and detailed explanations of those parts will be omitted. The line switching device shown in FIG. 1 is characterized by the receiving system signal path on the working line 100 side and the protection line 2
A scrambling circuit 13.13a for changing the frequency band of the input signal is provided in the signal path where the 00 reception system is distributed, that is, the signal path before entering the synchronous switching circuit 8, and a scrambling circuit 13.13a is provided in the signal path on the output side of the synchronous switching circuit 8. A desk scrambling circuit 14 is provided in the scrambling circuit 13.13a, and the signal frequency changed by the scrambling circuit 13.13a is returned to the original frequency. Here, a timing signal (for example, a power ON signal) 15 is output from the scramble circuit 13 on the working line 100 side to the scramble circuit 13a on the protection line 200 side.
The initial values of 13a are adjusted at the same time. Further, each scramble circuit 13, 13a includes 1. An O-conversion check output circuit 16, 1.6a is also provided, and when the circuit 16.16a detects the same phase on the working line 100 side and the protection line 200 side, each scramble circuit 13, 13a performs scrambling. By using the above-mentioned line switching device, the line switching method of the present invention can be carried out as follows. That is, when switching the working line 100 to the protection line 200, the initial values are the same on the working line 100 side and the protection line 200 side, or the 1°O conversion check circuit 16.
When the same phase is detected in both lines by 16a, the scrambling circuit 13.13a scrambles the signal trains of both lines before synchronization switching. This scrambling operation allows changes to be made to the main signal train, so even with light load signal trains with little change, such as all 1's or all O's continuing for a long time, the synchronization switching circuit 8 ensures phase synchronization. You can take it. Thereafter, the signal string output from the synchronization switching circuit 8 is descrambled by the descrambling circuit 14 to restore the signal state before scrambling. [Effects of the Invention] As explained above, according to the present invention, even in the case of a light load signal train in which all 1s or all O's continue for a long time or a signal train of a fixed pattern, synchronization can be reliably achieved, and no synchronization can be achieved. This has the effect of realizing momentary interruption switching.
第１図は本発明の詳細な説明するためのブロック構成図
、第２図は従来技術を説明するためのブロー、り構成図
である。
１：分岐回路 ５．５ａ：受信信号処理回路７：分配
回路 ８：同期切替え回路
１３．１３ａニスクランプル回路
１４：デスクランブル回路
１６．１６ａ：１，０変換点検回路FIG. 1 is a block diagram for explaining the present invention in detail, and FIG. 2 is a block diagram for explaining the prior art. 1: Branch circuit 5.5a: Received signal processing circuit 7: Distribution circuit 8: Synchronous switching circuit 13.13a Niscrumple circuit 14: Descrambling circuit 16.16a: 1,0 conversion check circuit
Claims (1)
予備回線との間で無瞬断受信同期切替えする回線切替え
方法であって、受信信号処理回路から出力された現用回
線側の主信号列と、予備回線側の主信号列とを、切替前
にスクランブル回路によりスクランブルさせ、かつ受信
同期後にデスクランブル回路によりデスクランブルさせ
ることを特徴とした回線切替え方法。A line switching method in which a signal string to which no signal in the wireless section is attached is switched between a working line and a protection line without any interruption in receiving synchronization, and the main signal string on the working line side output from a reception signal processing circuit. and a main signal train on the protection line side are scrambled by a scrambling circuit before switching, and descrambled by a descrambling circuit after reception synchronization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16675489A JPH0334638A (en) | 1989-06-30 | 1989-06-30 | Circuit switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16675489A JPH0334638A (en) | 1989-06-30 | 1989-06-30 | Circuit switching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0334638A true JPH0334638A (en) | 1991-02-14 |
Family
ID=15837117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16675489A Pending JPH0334638A (en) | 1989-06-30 | 1989-06-30 | Circuit switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0334638A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114839A (en) * | 1997-11-20 | 2000-09-05 | Hitachi Koki Co., Ltd. | Battery charging apparatus with error detection |
| US7011510B2 (en) | 2002-03-28 | 2006-03-14 | Kabushiki Kaisha Kobe Seiko Sho | Hot isostatic pressing apparatus and hot isostatic pressing method |
| EP1701426A2 (en) | 2005-03-11 | 2006-09-13 | Hitachi Koki Co., Ltd. | Battery charger |
| US7439708B2 (en) | 2004-05-18 | 2008-10-21 | Hitachi Koki Co., Ltd. | Battery charger with control of two power supply circuits |
| WO2010074351A2 (en) | 2008-12-26 | 2010-07-01 | Hitachi Koki Co., Ltd. | Charging device |
| EP2324997A2 (en) | 2009-11-20 | 2011-05-25 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Hot isostatic pressing device |
| US7956575B2 (en) | 2006-04-28 | 2011-06-07 | Hitachi Koki Co., Ltd. | Charging device for battery |
| US8652370B2 (en) | 2006-03-28 | 2014-02-18 | Kobe Steel, Ltd. | Hot isostatic pressing method and apparatus |
-
1989
- 1989-06-30 JP JP16675489A patent/JPH0334638A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6114839A (en) * | 1997-11-20 | 2000-09-05 | Hitachi Koki Co., Ltd. | Battery charging apparatus with error detection |
| US7011510B2 (en) | 2002-03-28 | 2006-03-14 | Kabushiki Kaisha Kobe Seiko Sho | Hot isostatic pressing apparatus and hot isostatic pressing method |
| US7439708B2 (en) | 2004-05-18 | 2008-10-21 | Hitachi Koki Co., Ltd. | Battery charger with control of two power supply circuits |
| EP1701426A2 (en) | 2005-03-11 | 2006-09-13 | Hitachi Koki Co., Ltd. | Battery charger |
| US8652370B2 (en) | 2006-03-28 | 2014-02-18 | Kobe Steel, Ltd. | Hot isostatic pressing method and apparatus |
| US7956575B2 (en) | 2006-04-28 | 2011-06-07 | Hitachi Koki Co., Ltd. | Charging device for battery |
| WO2010074351A2 (en) | 2008-12-26 | 2010-07-01 | Hitachi Koki Co., Ltd. | Charging device |
| EP2324997A2 (en) | 2009-11-20 | 2011-05-25 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Hot isostatic pressing device |
| US8449279B2 (en) | 2009-11-20 | 2013-05-28 | Kobe Steel, Ltd. | Hot isostatic pressing device |
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